CN112501938B - High-dust-holding and static-dissipation glass fiber filter material and preparation method thereof - Google Patents
High-dust-holding and static-dissipation glass fiber filter material and preparation method thereof Download PDFInfo
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- CN112501938B CN112501938B CN202011381918.7A CN202011381918A CN112501938B CN 112501938 B CN112501938 B CN 112501938B CN 202011381918 A CN202011381918 A CN 202011381918A CN 112501938 B CN112501938 B CN 112501938B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
- D21H13/40—Inorganic fibres or flakes siliceous vitreous, e.g. mineral wool, glass fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/02—Layered products essentially comprising sheet glass, or glass, slag, or like fibres in the form of fibres or filaments
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/46—Non-siliceous fibres, e.g. from metal oxides
- D21H13/50—Carbon fibres
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
The invention discloses a high-dust-holding and static-dissipating glass fiber filter material which comprises an upper surface layer, a middle layer and a lower surface layer, wherein the upper surface layer is a large-aperture layer, the thickness of the large-aperture layer is 0.2-0.3 mm, and the average aperture of the large-aperture layer is 18-50 mu m; the middle layer is a voltage-releasing fiber layer with a thickness of 0.1-0.2 mm and an average pore diameter of 8-20 μm; the lower surface layer is a small-aperture layer, the thickness of the lower surface layer is 0.1-0.2 mm, and the average aperture of the lower surface layer is 1-9 mu m; the upper layer, the middle layer and the lower layer are respectively made of fibers of all layers, and then are subjected to pulp distribution through a three-layer pulp flowing box, dehydration and drying for forming. The glass fiber filter material with the three-layer gradient pore structure has high dust capacity and delamination resistance, and the middle electricity-releasing fiber layer can play a role in eliminating or dissipating static electricity, so that charged particles passing through the electricity-releasing fiber layer are uncharged or carry little charge under the action of the electricity-releasing fiber, and the generation of static electricity in an electronic product production workshop is reduced.
Description
Technical Field
The invention relates to the technical field of glass fiber filter materials, in particular to a high-dust-holding-capacity and static-dissipation glass fiber filter material and a preparation method thereof.
Background
With the rapid development of semiconductor and photoelectron industries, the production workshops of electronic products have higher and higher requirements on antistatic and air cleanliness, and the air cleanliness can directly pollute the products if not meeting the standards, thereby affecting the performance, yield, reliability and service life of the products. The existence of static electricity can cause dielectric breakdown, so that the device is damaged, and accidents such as fire explosion and the like are easily caused. Static electricity is harmful and harmless to human bodies, can adsorb a large amount of dust in the air, accumulate toxic substances and germs, can cause anxiety, headache, chest distress and dyspnea of people under the long-term electrostatic radiation, and can cause diseases such as bronchial asthma, arrhythmia and the like.
In order to reduce the generation of static electricity, the static protection design of an electronic production workshop is definitely specified, and the environmental humidity is not lower than 50 percent; the formulation or water is allowed to be sprayed with the humidifying device without causing damage to the product. In addition, hydrofluoric acid is used in the production of electronic products, is easy to volatilize and reacts with boron in the glass fiber cotton, and the generated hydrofluoric acid is deposited on the surface of an electronic component, so that the breakdown failure of the electronic component can be caused. GB12158 states that the surface resistivity of electrostatic conductors is equal to or less than 1X 10 7 Omega, surface resistivity of electrostatic subconductor 1X 10 7 ～1×10 11 Omega, electrostatic nonconductor surface resistivity equal to or greater than 1 x 10 11 Ω。
The electromechanical systems of purifying air conditioners and the like are important means for ensuring that the air cleanliness of electronic product production workshops meets the specified requirements, the glass fiber filter material has extremely high filtering efficiency, excellent chemical stability and lower resistance, and is a preferred filter material for purifying air conditioners, but the existing common glass fiber has no antistatic function, is not moisture-proof, has high boron content and low dust holding capacity, and has short service life when being used for air purification of the electronic product production workshops.
Disclosure of Invention
The invention aims to provide a high-dust-capacity and static-dissipation glass fiber filter material and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
the high-dust-holding and static-dissipating glass fiber filter material comprises an upper surface layer, a middle layer and a lower surface layer, wherein the upper surface layer is a large-aperture layer, the thickness of the large-aperture layer is 0.2-0.3 mm, and the average aperture of the large-aperture layer is 18-50 mu m; the middle layer is a voltage-releasing fiber layer with a thickness of 0.1-0.2 mm and an average pore diameter of 8-20 μm; the lower surface layer is a small-aperture layer, the thickness of the lower surface layer is 0.1-0.2 mm, and the average aperture is 1-9 mu m; the upper layer, the middle layer and the lower layer are respectively made of fibers of all layers, and then are subjected to pulp distribution through a three-layer pulp flowing box, dehydration and drying for forming.
Furthermore, the base material of the large-aperture layer is glass fiber cotton and chopped glass fiber with the boron oxide content of less than 2%, and the mass ratio of the glass fiber cotton to the chopped glass fiber is (40-92) to (2-60).
Further, the base materials of the electricity-releasing fiber layer are glass fiber cotton and chopped glass fibers with the boron oxide content of less than 2 percent, and electricity-releasing fibers; the mass ratio of the glass fiber cotton, the electricity-releasing fiber and the chopped glass fiber is as follows: (40-92), (2-40) and (0-20).
Furthermore, the electricity-releasing fiber is at least one of carbon fiber, steel fiber, copper fiber or nickel fiber, the diameter of the electricity-releasing fiber is 2-8 μm, and the length of the electricity-releasing fiber is 2-15 mm.
Furthermore, the base material of the small-aperture layer is glass fiber cotton and chopped glass fiber with boron oxide content less than 2%, and the mass ratio of the glass fiber cotton to the chopped glass fiber is as follows: (75-98) and (2-15).
The preparation method of the high-dust-holding and static-dissipation glass fiber filter material comprises the following steps:
6.1, pulping:
preparing large-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to the mass ratio of (40-92) to (2-60), and pulping and defibering when the PH of a system is adjusted to be 2.5-4.5 to obtain suspension with the beating degree of 10-34 DEG SR and the concentration of 0.9-1.4 wt%;
preparing electricity-releasing fiber layer slurry, wherein the glass fiber cotton, the electricity-releasing fiber and the short-cut glass fiber are mixed according to the mass ratio: (40-92), (2-40), (0-20) are dispersed in water, and pulping and defibering are carried out when the pH of the system is adjusted to be 2.5-4.5, so as to obtain suspension with the beating degree of 15-39 DEG SR and the concentration of 0.9-1.4 wt%;
preparing small-aperture layer slurry, wherein the glass fiber cotton and the chopped glass fiber are mixed according to the mass ratio: (75-98), (2-15) dispersing in water, adjusting the pH of the system to 2.5-4.5, and beating and defibering to obtain a suspension with a beating degree of 35-70 DEG SR and a concentration of 0.9-1.4 wt%;
6.2, pulp distribution of a head box: respectively conveying the pulp of each layer prepared in the step 6.1 to the upper layer, the middle layer and the lower layer of a three-layer pulp flowing box, so that the pulp of the small-aperture layer is uniformly distributed on the bottom layer of the net part at the concentration of 0.1-0.2 wt%, the pulp of the electricity-releasing fiber layer is uniformly distributed on the upper layer of the small-aperture layer at the concentration of 0.1-0.2 wt%, and the pulp of the large-aperture layer is uniformly distributed on the upper layer of the electricity-releasing fiber layer at the concentration of 0.2-0.3 wt%, thereby forming a wet paper with a three-layer structure;
6.3, dehydration forming: naturally dehydrating and vacuumizing the wet paper sheet with the three-layer structure to form a wet paper sheet with the water content of 55-75%;
6.4, drying: and carrying out multi-cylinder drying or air drying on the wet paper with the water content of 55-75% to form the glass fiber filter material with the water content of 0.2-1.5%.
And further, before the pulp distribution step of the head box, the steps of filtering and diluting the large-aperture layer fiber pulp, the electricity-releasing fiber layer pulp and the small-aperture layer pulp in the step 6.2 are respectively carried out, wherein the large-aperture layer fiber pulp is diluted to 0.2-0.3 wt% by adding water, the electricity-releasing fiber layer pulp is diluted to 0.1-0.2 wt% by adding water, and the small-aperture layer pulp is diluted to 0.1-0.2 wt% by adding water.
Further, the drying step is preceded by a sizing step, wherein an adhesive is applied to the wet paper sheet in a curtain or spray manner, and the adhesive accounts for 2-9% of the total mass of the absolutely dry fibers.
Furthermore, the adhesive is at least one of pure acrylic emulsion, silane modified acrylic emulsion, polyvinyl alcohol or melamine emulsion.
Further, the drying step also comprises a step of applying a waterproof agent, wherein the fluorocarbon, organic silicon or environment-friendly PFOA-free waterproof agent is applied when the moisture content of the wet paper is 10-25 wt%, and the waterproof agent accounts for 0.5-2% of the total mass of the absolutely dry fibers.
The invention has the beneficial effects that:
1. the glass fiber filter material has a three-layer structure, wherein the windward surface layer is a large-aperture layer with the average aperture of 18-50 mu m, the middle layer is a voltage-release fiber layer with the average aperture of 8-20 mu m, the air-out surface layer is a small-aperture layer with the average aperture of 1-9 mu m, the thickness of the large-aperture layer is larger, the middle layer and the small-aperture layer form a gradient structure with the aperture and the thickness gradually reduced from the air inlet direction to the air outlet direction, the large-aperture layer intercepts particles with larger size during filtering, the particles with smaller size penetrate through the large-aperture layer and are intercepted in the middle layer or the small-aperture layer, the pores of the whole filter material can be fully utilized, the dust capacity of the filter material is improved, the filter material has lower filtering resistance, and the service life of the filter material is prolonged. The middle layer is the electricity-releasing fiber layer, and the electricity-releasing fiber layer can play a role in eliminating or dissipating static electricity, so that charged particles passing through the electricity-releasing fiber layer are uncharged or carry little charge under the action of the electricity-releasing fiber layer, and the generation of static electricity in electronic product production workshops is reduced.
2. The glass fiber filter material is formed by respectively pulping each layer of fiber, then distributing pulp through a three-layer pulp flowing box, and dehydrating and drying. The pulping conditions of each layer of fiber are respectively controlled to obtain three kinds of pulp with different degrees of beating and concentrations, three layers of head boxes are adopted for pulp distribution, pulp with different components forms an enhancement effect with a net part roller wheel through a head box blade, and under the action of pressure and tension, each layer of fiber is mutually embedded in the vertical direction to form a multilayer filter material with a gradient structure. The filter material manufactured by adopting a multi-layer headbox has tighter fiber combination among layers, more continuous transition of a combination part, higher moisture removal efficiency and difficult layering.
3. The base material of the glass fiber filter material adopts the boron-free or low-boron glass fiber cotton and the chopped glass fiber, so that the probability of reacting the glass fiber filter material with hydrofluoric acid to generate the fluoboric acid can be reduced, and the generated fluoboric acid is prevented from being deposited on the surface of an electronic component to cause breakdown failure of the electronic component.
4. The application of the waterproof agent can ensure that the glass fiber filter material has better moisture resistance, adapts to the working condition of an electronic product production workshop, and prolongs the service life of the filter material.
Drawings
FIG. 1 is a schematic structural diagram showing a high dust-holding and static-dissipative glass fiber filter material of the present invention.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
Referring to fig. 1, the present embodiment provides a high dust-holding and static-dissipating glass fiber filter material, which is composed of an upper layer 1, a middle layer 2 and a lower layer 3, wherein the upper layer 1 is a large-aperture layer, the thickness is 0.2mm, and the average aperture is 19 μm; the middle layer 2 is a discharge fiber layer with the thickness of 0.1mm and the average pore diameter of 10 μm; the lower layer is a small-aperture layer with a thickness of 0.1mm and an average aperture of 8 μm. The base material of the large-aperture layer is glass fiber cotton with boron oxide content of 1.8% and chopped glass fiber, and the mass ratio of the glass fiber cotton to the chopped glass fiber is 40: 4. The base material of the electricity-releasing fiber layer is glass fiber cotton with the boron oxide content of 1.8 percent and electricity-releasing fiber; the mass ratio of the glass fiber cotton to the electricity-releasing fiber is 40: 2. The electricity-releasing fiber is a carbon fiber with the diameter of 2 mu m and the length of 3 mm. The base material of the small-aperture layer is glass fiber cotton with the boron oxide content of 1.8% and chopped glass fibers, and the mass ratio of the glass fiber cotton to the chopped glass fibers is 75: 15.
The preparation method of the glass fiber filter material in the embodiment 1 comprises the following steps:
(1) pulping:
preparing large-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to the mass ratio of 40:4, and pulping and defibering when the PH of a system is adjusted to be 2.5 to obtain suspension with the beating degree of 20 DEG SR and the concentration of 0.9 wt%;
preparing electricity-releasing fiber layer slurry, dispersing glass fiber cotton and electricity-releasing fibers in water according to the mass ratio of 40:2, and pulping and defibering when the pH of a system is adjusted to be 2.5 to obtain suspension with the beating degree of 30 DEG SR and the concentration of 0.9 wt%;
preparing small-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to a mass ratio of 75:15, and pulping and defibering when the PH of a system is adjusted to be 2.5 to obtain a suspension with a beating degree of 35 DEG SR and a concentration of 0.9 wt%;
(2) size mixing: diluting the large-aperture layer fiber slurry to 0.2 wt% by adding water, diluting the electricity-releasing fiber layer slurry to 0.1 wt% by adding water, and diluting the small-aperture layer slurry to 0.1 wt% by adding water;
(3) pulp distribution of a head box: respectively conveying the diluted slurry of each layer to the upper layer, the middle layer and the lower layer of a three-layer pulp flow box, so that the slurry of the small-aperture layer is uniformly distributed on the bottom layer of the net part at the concentration of 0.1 wt%, the slurry of the electricity-releasing fiber layer is uniformly distributed on the upper layer of the small-aperture layer at the concentration of 0.1 wt%, and the slurry of the large-aperture layer is uniformly distributed on the upper layer of the electricity-releasing fiber layer at the concentration of 0.2 wt%, thereby forming a wet paper with a three-layer structure;
(4) dewatering and forming: the wet paper with the three-layer structure is subjected to natural dehydration and vacuum dehydration to form the wet paper with the water content of 55%;
(5) sizing: applying pure acrylic emulsion accounting for 2% of the total mass of the absolutely dry fibers to wet paper sheets by adopting a curtain type sizing method, and vacuumizing and dehydrating until the water content is 60%;
(6) and (3) drying: wet paper with the water content of 60 percent is dried for 25 minutes at 90 ℃ by a multi-cylinder dryer, so that the water content of the wet paper is 25 weight percent, and a fluorocarbon waterproofing agent accounting for 0.5 percent of the total mass of absolute dry fibers is uniformly applied to the paper with the water content of 25 weight percent; and (3) drying the paper sheet applied with the waterproof agent for 25 minutes at 150 ℃ by using a multi-cylinder dryer to obtain the high-dust-holding and static-dissipation glass fiber filter material with the water content of 1.5%.
Example 2
The embodiment provides a high-dust-holding and static-dissipating glass fiber filter material which comprises an upper layer 1, a middle layer 2 and a lower layer 3, wherein the upper layer 1 is a large-aperture layer, the thickness of the large-aperture layer is 0.25mm, and the average aperture of the large-aperture layer is 30 micrometers; the middle layer 2 is a discharge fiber layer with the thickness of 0.12mm and the average pore diameter of 15 μm; the lower layer is a small-aperture layer with a thickness of 0.12mm and an average aperture of 5 μm. The base material of the large-aperture layer is glass fiber cotton with boron oxide content of 1.6% and chopped glass fiber, and the mass ratio of the glass fiber cotton to the chopped glass fiber is 60: 12. The base material of the electricity-releasing fiber layer is glass fiber cotton with the boron oxide content of 1.6 percent and electricity-releasing fiber; the mass ratio of the glass fiber cotton to the electricity-releasing fiber is 60:10, and the electricity-releasing fiber is a steel fiber with the diameter of 3 mu m and the length of 6 mm. The base material of the small-aperture layer is glass fiber cotton with the boron oxide content of 1.6% and chopped glass fibers, and the mass ratio of the glass fiber cotton to the chopped glass fibers is 80: 12.
The preparation method of the glass fiber filter material of the embodiment 2 comprises the following steps:
(1) pulping:
preparing large-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to the mass ratio of 60:12, and pulping and defibering when the PH of a system is adjusted to be 3 to obtain suspension with the beating degree of 13 DEG SR and the concentration of 1 wt%;
preparing electricity-releasing fiber layer slurry, dispersing glass fiber cotton and electricity-releasing fibers in water according to the mass ratio of 60:10, and pulping and defibering when the PH of a system is adjusted to be 3 to obtain suspension with the beating degree of 25 DEG SR and the concentration of 1 wt%;
preparing small-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to the mass ratio of 80:3, and pulping and defibering when the PH of a system is adjusted to be 3 to obtain suspension with the beating degree of 40 DEG SR and the concentration of 1 wt%;
(2) size mixing: diluting the large-aperture layer fiber slurry to 0.24 wt% by adding water, diluting the electricity-releasing fiber layer slurry to 0.12 wt% by adding water, and diluting the small-aperture layer slurry to 0.12 wt% by adding water;
(3) pulp distribution of a head box: after dilution, the pulp of each layer is respectively conveyed to the upper layer, the middle layer and the lower layer of the three-layer head box, the pulp of the small aperture layer is uniformly distributed on the bottom layer of the net part at the concentration of 0.12 wt%, the pulp of the electricity-releasing fiber layer is uniformly distributed on the upper layer of the small aperture layer at the concentration of 0.12 wt%, and the pulp of the large aperture layer is uniformly distributed on the upper layer of the electricity-releasing fiber layer at the concentration of 0.24 wt%, so as to form a wet paper with a three-layer structure;
(4) dewatering and forming: the wet paper with the three-layer structure is subjected to natural dehydration and vacuum dehydration to form the wet paper with the water content of 65 percent;
(5) sizing: applying silane modified acrylic emulsion accounting for 4% of the total mass of absolutely dry fibers to wet paper sheets in a curtain type sizing mode, and vacuumizing and dehydrating until the water content is 62%;
(6) and (3) drying: enabling the wet paper with the water content of 62 percent to pass through a multi-cylinder dryer, drying for 30 minutes at 80 ℃ to enable the water content of the wet paper to be 20 percent by weight, and uniformly applying an organic silicon waterproof agent accounting for 1 percent of the total mass of absolute dry fibers to a paper sheet with the water content of 20 percent by weight; and (3) drying the paper sheet applied with the waterproof agent for 30 minutes at 140 ℃ by using a multi-cylinder dryer to obtain the high-dust-holding and static-dissipation glass fiber filter material with the water content of 0.8%.
Example 3
The embodiment provides a high-dust-holding and static-dissipating glass fiber filter material which comprises an upper layer 1, a middle layer 2 and a lower layer 3, wherein the upper layer 1 is a large-aperture layer, the thickness of the large-aperture layer is 0.28mm, and the average aperture of the large-aperture layer is 40 micrometers; the middle layer 2 is a discharge fiber layer with the thickness of 0.15mm and the average pore diameter of 12 mu m; the lower layer is a small-aperture layer with a thickness of 0.13mm and an average aperture of 3 μm. The base material of the large-aperture layer is glass fiber cotton with the boron oxide content of 1.5% and chopped glass fiber, and the mass ratio of the glass fiber cotton to the chopped glass fiber is 80: 35. The base material of the electricity-releasing fiber layer is glass fiber cotton with the boron oxide content of 1.5 percent, short-cut glass fiber and electricity-releasing fiber; the mass ratio of the glass fiber cotton to the electricity-releasing fiber to the chopped glass fiber is 80:10: 10. The electricity-releasing fiber is a copper fiber with the diameter of 5 mu m and the length of 9 mm. The base material of the small-aperture layer is glass fiber cotton with the boron oxide content of 1.5% and chopped glass fibers, and the mass ratio of the glass fiber cotton to the chopped glass fibers is 85: 10.
The preparation method of the glass fiber filter material in the embodiment 3 comprises the following steps:
(1) pulping:
preparing large-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to the mass ratio of 80:35, and pulping and defibering when the pH of a system is adjusted to be 3.5 to obtain suspension with the beating degree of 11-degree SR and the concentration of 1.2 wt%;
preparing electricity-releasing fiber layer slurry, dispersing glass fiber cotton, electricity-releasing fibers and chopped glass fibers in a mass ratio of 80:10:10 in water, and pulping and defibering when the PH of a system is adjusted to be 3.5 to obtain suspension with a beating degree of 28 DEG SR and a concentration of 1.2 wt%;
preparing small-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to the mass ratio of 85:10, and pulping and defibering when the PH of a system is adjusted to be 3.5 to obtain suspension with the beating degree of 50 DEG SR and the concentration of 1.2 wt%;
(2) size mixing: diluting the large-aperture layer fiber slurry to 0.28 wt% by adding water, diluting the electricity-releasing fiber layer slurry to 0.15 wt% by adding water, and diluting the small-aperture layer slurry to 0.13 wt% by adding water;
(3) slurry distribution of a head box is carried out, and the diluted slurry of each layer is respectively conveyed to the upper layer, the middle layer and the lower layer of a three-layer head box, so that the slurry of a small-aperture layer is uniformly distributed on the bottom layer of a net part at the concentration of 0.13 wt%, the slurry of a electricity-releasing fiber layer is uniformly distributed on the upper layer of the small-aperture layer at the concentration of 0.15 wt%, and the slurry of a large-aperture layer is uniformly distributed on the upper layer of the electricity-releasing fiber layer at the concentration of 0.28 wt%, so as to form a wet paper with a three-layer structure;
(4) dewatering and forming: the wet paper with the three-layer structure is subjected to natural dehydration and vacuum dehydration to form the wet paper with the water content of 70%;
(5) sizing: applying polyvinyl alcohol emulsion accounting for 6% of the total mass of the absolutely dry fibers to wet paper sheets in a spraying sizing mode, and vacuumizing and dehydrating until the water content is 65%;
(6) and (3) drying: drying the wet paper with the water content of 65% for 40 minutes at 90 ℃ by an air dryer to ensure that the water content of the wet paper is 15 wt%, and uniformly applying an organic silicon waterproof agent accounting for 1.5% of the total mass of absolutely dry fibers to the paper with the water content of 15 wt%; and (3) drying the paper sheet applied with the waterproof agent for 20 minutes at 180 ℃ by an air dryer to obtain the high-dust-holding and static-dissipation glass fiber filter material with the water content of 0.2%.
Example 4
The embodiment provides a high-dust-holding and static-dissipating glass fiber filter material which comprises an upper layer 1, a middle layer 2 and a lower layer 3, wherein the upper layer 1 is a large-aperture layer, the thickness of the large-aperture layer is 0.3mm, and the average aperture of the large-aperture layer is 48 mu m; the middle layer 2 is a discharge fiber layer with the thickness of 0.2mm and the average pore diameter of 20 μm; the lower layer is a small-aperture layer with a thickness of 0.2mm and an average aperture of 1 μm. The base material of the large-aperture layer is glass fiber cotton with the boron oxide content of 1.3% and chopped glass fiber, and the mass ratio of the glass fiber cotton to the chopped glass fiber is 92: 60. The base material of the electricity-releasing fiber layer is glass fiber cotton with boron oxide content of 1.3%, chopped glass fiber and electricity-releasing fiber; the mass ratio of the glass fiber cotton to the electricity-releasing fiber to the chopped glass fiber is 92:40: 2. The electricity-releasing fiber is a nickel fiber with the diameter of 8 mu m and the length of 15 mm. The base material of the small-aperture layer is glass fiber cotton with the boron oxide content of 1.3% and chopped glass fiber, and the mass ratio of the glass fiber cotton to the chopped glass fiber is 98: 2.
The preparation method of the glass fiber filter material of the embodiment 4 comprises the following steps:
(1) pulping:
preparing large-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to the mass ratio of 92:60, adjusting the pH of a system to be 4, pulping and defibering to obtain suspension with the beating degree of 10 DEG SR and the concentration of 1.4 wt%;
preparing electricity-releasing fiber layer slurry, dispersing glass fiber cotton, electricity-releasing fibers and chopped glass fibers in a mass ratio of 92:40:2 in water, and pulping and defibering when the pH of a system is adjusted to be 4.5 to obtain suspension with a beating degree of 15 DEG SR and a concentration of 1.4 wt%;
preparing small-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to the mass ratio of 98:2, and pulping and defibering when the PH of a system is adjusted to be 4 to obtain suspension with the beating degree of 70 DEG SR and the concentration of 1.4 wt%;
(2) size mixing: diluting the large-aperture layer fiber slurry to 0.3 wt% by adding water, diluting the electricity-releasing fiber layer slurry to 0.2 wt% by adding water, and diluting the small-aperture layer slurry to 0.2 wt% by adding water;
(3) pulp distribution of a head box: the diluted slurry of each layer is respectively conveyed to the upper layer, the middle layer and the lower layer of a three-layer pulp flow box, the slurry of the small-aperture layer is uniformly distributed on the bottom layer of the net part at the concentration of 0.2 wt%, the slurry of the electricity-releasing fiber layer is uniformly distributed on the upper layer of the small-aperture layer at the concentration of 0.2 wt%, and the slurry of the large-aperture layer is uniformly distributed on the upper layer of the electricity-releasing fiber layer at the concentration of 0.3 wt%, so that a wet paper with a three-layer structure is formed;
(4) dewatering and forming: the wet paper with the three-layer structure is subjected to natural dehydration and vacuum dehydration to form the wet paper with the water content of 75 percent;
(5) sizing: applying acrylic emulsion and melamine emulsion which account for 9 percent of the total mass of the absolutely dry fibers to wet paper sheets according to the proportion of 1:1 by adopting a jet type sizing mode, and vacuumizing and dehydrating until the water content is 70 percent;
(6) and (3) drying: drying the wet paper with the water content of 70 percent for 90 minutes at 70 ℃ by an air dryer to ensure that the water content of the wet paper is 10 weight percent, and uniformly applying an environment-friendly PFOA-free waterproofing agent accounting for 2 percent of the total mass of absolutely dry fibers to the paper with the water content of 10 weight percent; and (3) drying the paper sheet applied with the waterproof agent for 15 minutes at 160 ℃ by using an air dryer to obtain the high-dust-holding and static-dissipation glass fiber filter material with the water content of 0.5%.
The commercially available filter material 1 is an F9W single-layer glass fiber filter material with the thickness of 0.4 mm.
The commercially available filter material 2 is a H11W single-layer glass fiber filter material with the thickness of 0.5 mm.
The commercially available filter material 3 is a 49W single-layer glass fiber filter material with the thickness of 0.55 mm.
The commercially available filter 4 is a H14W single-layer glass fiber filter with a thickness of 0.65 mm.
And (3) performance testing:
1. the glass fiber filter material and the commercially available glass fiber filter material of the embodiment of the invention are respectively subjected to a filtration performance test, and TSI8130(0.3 mu m @5.3cm/s) is adopted according to a test standard CRAA 431.3.
2. The conductivity tests of the glass fiber filter material and the commercially available glass fiber filter material of the embodiment of the invention are respectively carried out, and a ZC-90E high-insulation resistance measuring instrument (detection voltage 500V) is adopted according to the GB12158 standard.
The test results are shown in tables 1-2 below.
TABLE 1 test results of filtering performance of glass fiber filter material
| Filtration efficiency (%) | Filtration resistance (Pa) | |
| Example 1 | 88 | 65 |
| Commercially available filter material 1 | 88 | 82 |
| Example 2 | 99 | 130 |
| Commercial filter material 2 | 99 | 168 |
| Example 3 | 99.99 | 260 |
| Commercially available filter material 3 | 99.99 | 350 |
| Example 4 | 99.997 | 294 |
| Commercially available filter material 4 | 99.996 | 380 |
TABLE 2 surface resistivity and dust holding capacity test results of glass fiber filter material
As can be seen from the test results in tables 1 and 2, the filtration resistance of the glass fiber filter materials prepared in examples 1 to 4 is reduced by 22% to 25% compared with the commercially available filter materials, and the dust holding capacity is increased by 20% to 50% compared with the commercially available filter materials under the same filtration efficiency. The glass fiber filter materials prepared in examples 1 to 4 are all electrostatic subconductors, and the commercially available filter materials are all electrostatic nonconductors.
The glass fiber filter material prepared in the embodiment 1 is used for a purification air-conditioning system of an electronic product production workshop, and the running power of a fan of the purification air-conditioning system is reduced by about 10%; moreover, the replacement period of the glass fiber filter material is prolonged to more than 8 months from the original half year, and the number of times of electrostatic ignition in a workshop is reduced to about 50 percent of the original number.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (4)
1. The high-dust-holding and static-dissipating glass fiber filter material is characterized by comprising an upper surface layer, a middle layer and a lower surface layer, wherein the upper surface layer is a large-aperture layer, the thickness of the large-aperture layer is 0.2-0.3 mm, and the average aperture of the large-aperture layer is 18-50 mu m; the middle layer is a voltage-releasing fiber layer with a thickness of 0.1-0.2 mm and an average pore size of 8-20 μm; the lower surface layer is a small-aperture layer, the thickness of the lower surface layer is 0.1-0.2 mm, and the average aperture of the lower surface layer is 1-9 mu m; the upper surface layer, the middle layer and the lower surface layer are respectively pulped by fibers of all layers and then are subjected to pulp distribution by a three-layer pulp flowing box, dehydration and drying for forming; the base material of the electricity-releasing fiber layer is glass fiber cotton with the boron oxide content of less than 2 percent, chopped glass fiber and electricity-releasing fiber; the mass ratio of the glass fiber cotton, the electricity-releasing fiber and the chopped glass fiber is as follows: (40 to 92), (2 to 40), (0 to 20); the glass fiber filter material is an electrostatic sub-conductor;
the preparation method of the high-dust-holding and static-dissipation glass fiber filter material specifically comprises the following steps:
1.1, pulping:
preparing large-aperture layer slurry, dispersing glass fiber cotton and chopped glass fibers in water according to the mass ratio of (40-92) to (2-60), and pulping and defibering when the PH of a system is adjusted to be 2.5-4.5 to obtain suspension with the beating degree of 10-34 DEG SR and the concentration of 0.9-1.4 wt%;
preparing electricity-releasing fiber layer slurry, wherein the glass fiber cotton, the electricity-releasing fiber and the short-cut glass fiber are mixed according to the mass ratio: (40-92), (2-40), (0-20) are dispersed in water, and pulping and defibering are carried out when the pH of the system is adjusted to be 2.5-4.5, so as to obtain suspension with the beating degree of 15-39 DEG SR and the concentration of 0.9-1.4 wt%;
preparing slurry of the small-aperture layer, wherein the glass fiber cotton and the chopped glass fiber are mixed according to the mass ratio: (75-98), (2-15) dispersing in water, adjusting the pH of the system to 2.5-4.5, and beating and defibering to obtain a suspension with a beating degree of 35-70 DEG SR and a concentration of 0.9-1.4 wt%;
1.2, pulp distribution of a head box: respectively conveying the pulp of each layer prepared in the step 1.1 to the upper layer, the middle layer and the lower layer of a three-layer pulp flowing box, so that the pulp of a small-aperture layer is uniformly distributed on the bottom layer of a net part at the concentration of 0.1-0.2 wt%, the pulp of a electricity-releasing fiber layer is uniformly distributed on the upper layer of the small-aperture layer at the concentration of 0.1-0.2 wt%, and the pulp of a large-aperture layer is uniformly distributed on the upper layer of the electricity-releasing fiber layer at the concentration of 0.2-0.3 wt%, thereby forming a wet paper with a three-layer structure;
1.3, dehydrating and forming: naturally dehydrating and vacuumizing the wet paper sheet with the three-layer structure to form a wet paper sheet with the water content of 55-75%;
1.4, drying: carrying out multi-cylinder drying or air drying on the wet paper with the water content of 55-75% to form a glass fiber filter material with the water content of 0.2-1.5%; the drying step also comprises a step of applying a waterproof agent, wherein the waterproof agent is fluorocarbon, organic silicon or environment-friendly PFOA-free waterproof agent which accounts for 0.5-2% of the total mass of the absolutely dry fibers when the moisture content of the wet paper is 10-25 wt%;
the electricity-releasing fiber is at least one of steel fiber, copper fiber or nickel fiber, the diameter of the electricity-releasing fiber is 2-8 mu m, and the length of the electricity-releasing fiber is 2-15 mm;
the base material of the large-aperture layer is glass fiber cotton with boron oxide content less than 2% and chopped glass fiber, and the mass ratio of the glass fiber cotton to the chopped glass fiber is (40-92) to (2-60);
the base material of the small-aperture layer is glass fiber cotton with the boron oxide content of less than 2% and chopped glass fiber, and the mass ratio of the glass fiber cotton to the chopped glass fiber is as follows: (75-98) and (2-15).
2. The high dust-holding and electrostatic dissipation glass fiber filter material as claimed in claim 1, further comprising a step of filtering and diluting the large-aperture layer fiber slurry, the electricity-releasing fiber layer slurry and the small-aperture layer slurry in step 1.2 with water respectively before the slurry distribution step of the head box, wherein the large-aperture layer fiber slurry is diluted with water to a concentration of 0.2-0.3 wt%, the electricity-releasing fiber layer slurry is diluted with water to a concentration of 0.1-0.2 wt%, and the small-aperture layer slurry is diluted with water to a concentration of 0.1-0.2 wt%.
3. The high dust holding, static dissipative fiberglass filter material of claim 1, further comprising a sizing step prior to the drying step, wherein the sizing step is performed by applying an adhesive to the wet paper sheet in a curtain or spray manner, the adhesive comprising 2 to 9% of the total mass of the absolutely dry fibers.
4. The high dust holding, electrostatic dissipative fiberglass filter of claim 3, wherein the adhesive is at least one of a acrylic emulsion, a silane modified acrylic emulsion, polyvinyl alcohol, or a melamine emulsion.
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| PCT/CN2021/134516 WO2022116973A1 (en) | 2020-12-01 | 2021-11-30 | High-dust-holding capacity and electrostatic dissipation glass fiber filter material, and preparation method therefor |
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| CN114517424A (en) * | 2022-02-18 | 2022-05-20 | 南京玻璃纤维研究设计院有限公司 | Separation strip for high-temperature-resistant air filter and preparation method thereof |
| CN115948940A (en) * | 2022-12-05 | 2023-04-11 | 南京玻璃纤维研究设计院有限公司 | Preparation method of salt spray filter paper and salt spray filter paper |
| CN117026684A (en) * | 2023-07-12 | 2023-11-10 | 山东仁丰特种材料股份有限公司 | High-performance gradient glass fiber liquid filter paper and preparation method and application thereof |
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