CN109400105B - Preparation method of powder falling prevention aerogel felt - Google Patents
Preparation method of powder falling prevention aerogel felt Download PDFInfo
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- CN109400105B CN109400105B CN201811124685.5A CN201811124685A CN109400105B CN 109400105 B CN109400105 B CN 109400105B CN 201811124685 A CN201811124685 A CN 201811124685A CN 109400105 B CN109400105 B CN 109400105B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B30/00—Compositions for artificial stone, not containing binders
- C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/483—Polyacrylates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/62—Coating or impregnation with organic materials
- C04B41/63—Macromolecular compounds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention belongs to the field of heat insulation materials, and discloses a preparation method of an anti-powder falling aerogel felt. Mixing orthosilicate ester, ethanol and water uniformly, and then adding NH in sequence4Uniformly stirring the solution F and ammonia water to obtain silicon dioxide sol; soaking the fibrofelt in silica sol, standing and aging, performing hydrophobic modification treatment, performing solvent replacement by using absolute ethyl alcohol, and drying to obtain a silica aerogel felt; purging the silica aerogel felt, and performing irradiation treatment on the front surface and the back surface of the silica aerogel felt; and respectively and uniformly spraying the water-based adhesive on the front surface and the back surface of the silica aerogel felt, and drying to obtain the powder falling prevention aerogel felt. According to the invention, the method of irradiating the surface of the silica aerogel felt by using the electron beam enables the surface of the silica aerogel felt to be hydrophilic, so that the spreading of an aqueous adhesive on the surface of the silica aerogel felt is facilitated, and the powder falling condition is prevented.
Description
Technical Field
The invention belongs to the field of heat insulation materials, and particularly relates to a preparation method of an anti-powder-dropping aerogel felt.
Background
At present, developing new energy, improving the utilization rate of the existing energy and saving energy have attracted great attention from various countries. China is an energy-poor country, so that reasonable utilization of energy and energy conservation have important significance on sustainable development of China's society. The development of environment-friendly heat insulation materials by adopting new technology and new process is one of the most effective and economic measures for saving energy.
SiO2Aerogel is a new super heat-insulating material, has extremely low heat conductivity coefficient which is far lower than that of static air at normal temperature by 0.25W/m.K, has incomparable heat-insulating and heat-preserving effects compared with other materials, has low density, is waterproof, flame-retardant, green and environment-friendly, is corrosion-resistant, is not easy to age, has long service life, and is called as the super heat-insulating material. At present, the method is mainly used for industrial pipelines, industrial furnace bodies and lifesavingThe heat preservation and the heat insulation in the fields of cabins, transportation, household appliances, glass and the like. However, SiO is due to the method of its preparation2The aerogel felt generally has the condition that the felt body drops aerogel powder in the transportation, construction and use processes, the powder dropping condition not only brings inconvenience to the construction, but also brings threat to the health of constructors, and simultaneously the performance of the aerogel felt can be reduced. Therefore, on the premise of ensuring good heat insulation performance of the aerogel felt, the development of the aerogel composite material without powder falling is necessary to ensure the health of production and use personnel and meet various requirements of the market. At present, the powder falling prevention scheme is that glass fiber cloth, aluminum foil cloth and the like are pasted on the surface of an aerogel fiber felt, the mode is high in labor cost and not beneficial to large-scale production, the flexibility of the material is reduced after the front side and the back side are pasted, the material is not easy to curl and bend, and storage, transportation, construction and installation are not convenient enough. The coating preparation technology of the surface of the aerogel felt is one of the recently developed methods for avoiding the dusting of the aerogel felt. The surface of the aerogel is coated with solvent-based coating to prevent slag falling, and the solvent-based coating can bring environmental pollution, and can cause the solvent to permeate into the aerogel to damage a pore structure and reduce the heat-insulating property of the aerogel.
Disclosure of Invention
The invention aims to provide a preparation method of an anti-dusting aerogel felt.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of an anti-dusting aerogel felt comprises the following steps:
(1) mixing orthosilicate ester, ethanol and water uniformly, and then adding NH in sequence4Uniformly stirring the solution F and ammonia water to obtain silicon dioxide sol; wherein, in terms of molar ratio, the orthosilicate ester, the ethanol and the water are = 1: (4-12): (2-4); NH (NH)4The amount of the F solution added is such that the molar ratio of NH is4F, orthosilicate ester = (0.002-0.01): 1; the addition of ammonia water ensures that NH is calculated by molar ratio3Orthosilicate = (0.005-0.015) 1;
(2) soaking the fibrofelt in the silica sol obtained in the step (1), and then statically aging for 8-24 h at 30-60 ℃;
(3) carrying out hydrophobic modification treatment on the fiber felt obtained in the step (2), then carrying out solvent replacement by using absolute ethyl alcohol, and drying to obtain a silicon dioxide aerogel felt;
(4) purging the silica aerogel felt obtained in the step (3) to remove surface floating powder;
(5) respectively carrying out irradiation treatment on the front surface and the back surface of the silica aerogel felt obtained in the step (4) through electron beams;
(6) and (5) respectively and uniformly spraying the water-based adhesive on the front surface and the back surface of the silica aerogel felt obtained in the step (5), and drying to obtain the powder falling prevention aerogel felt.
Preferably, in the step (1), the orthosilicate is tetraethoxysilane or methyl orthosilicate.
Preferably, in the step (2), the time for dipping the fiber felt into the silica sol is 12-24 hours.
Preferably, in the step (3), the fiber felt obtained in the step (2) is placed in a modifying solution for hydrophobic modification treatment for 12-24 hours, the modifying solution is a mixed solution of a modifying agent and absolute ethyl alcohol according to the molar ratio of 1: 2-5, and the modifying agent is hexamethyldisiloxane or trimethylchlorosilane.
Preferably, in the step (3), the number of times of replacement of the absolute ethyl alcohol is 2-3, and the time of each replacement is 12-36 hours.
Preferably, in the step (5), the irradiation dose of the electron beam is 1-5 kGy and the time is 1-5 min.
Preferably, in the step (6), the aqueous adhesive is an aqueous acrylic emulsion, an aqueous acrylic ester emulsion, an aqueous polyurethane emulsion or an aqueous epoxy resin emulsion, and the viscosity of the aqueous adhesive is 70-80 Pa · s.
According to the invention, the aqueous adhesive is coated on the surface of the silica aerogel felt to prevent the particles on the surface of the felt from falling off, and as the silica aerogel felt is subjected to hydrophobic treatment and the aqueous adhesive is sprayed on the surface of the silica aerogel felt, the uniform spreading of the aqueous adhesive on the surface of the silica aerogel felt is difficult to ensure.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
Example 1
A preparation method of an anti-dusting aerogel felt comprises the following steps:
(1) taking tetraethoxysilane, absolute ethyl alcohol and water to be uniformly mixed, and then sequentially adding 2 mol/L NH4Uniformly stirring the solution F and 0.2 moL/L ammonia water to obtain silicon dioxide sol; wherein, in terms of molar ratio, the ethyl orthosilicate, the absolute ethyl alcohol and the water are = 1: 12: 4; NH (NH)4The amount of the F solution added is such that the molar ratio of NH is4F, tetraethoxysilane = 0.008: 1; the addition of ammonia water ensures that NH is calculated by molar ratio3Ethyl orthosilicate = 0.01: 1;
(2) soaking a glass fiber felt in the silica sol obtained in the step (1) for 20 hours, and then statically aging at 40 ℃ for 12 hours;
(3) placing the glass fiber mat obtained in the step (2) in a modifying solution for hydrophobic modification treatment for 20 hours, wherein the modifying solution is a mixed solution of a modifying agent and absolute ethyl alcohol according to a molar ratio of 1: 5, and the modifying agent is hexamethyldisiloxane; after the hydrophobic modification treatment is finished, carrying out solvent replacement for 2 times by using absolute ethyl alcohol, wherein the replacement time is 24 hours each time, and then drying to obtain a silicon dioxide aerogel felt;
(4) purging the silica aerogel felt obtained in the step (3) to remove surface floating powder;
(5) respectively carrying out irradiation treatment on the front surface and the back surface of the silica aerogel felt obtained in the step (4) through electron beams, wherein the irradiation dose is 2 kGy, and the time is 3 min;
(6) and (3) respectively and uniformly spraying the water-based acrylic emulsion with the viscosity range of 70 Pa.s on the front surface and the back surface of the silica aerogel felt obtained in the step (5), and drying to obtain the anti-dusting aerogel felt.
Example 2
A preparation method of an anti-dusting aerogel felt comprises the following steps:
(1) taking tetraethoxysilane, absolute ethyl alcohol and water to be uniformly mixed, and then sequentially adding 2 mol/L NH4Uniformly stirring the solution F and 0.2 moL/L ammonia water to obtain silicon dioxide sol; wherein, in terms of molar ratio, the ethyl orthosilicate, the absolute ethyl alcohol and the water are = 1: 10: 3; NH (NH)4The amount of the F solution added is such that the molar ratio of NH is4F, tetraethoxysilane = 0.01: 1; the addition of ammonia water ensures that NH is calculated by molar ratio3Ethyl orthosilicate = 0.008: 1;
(2) soaking a glass fiber felt in the silica sol obtained in the step (1) for 24 hours, and then standing and aging at 60 ℃ for 20 hours;
(3) placing the glass fiber mat obtained in the step (2) in a modifying solution for hydrophobic modification treatment for 24 hours, wherein the modifying solution is a mixed solution of a modifying agent and absolute ethyl alcohol according to a molar ratio of 1: 4, and the modifying agent is hexamethyldisiloxane; after the hydrophobic modification treatment is finished, then carrying out solvent replacement for 3 times by using absolute ethyl alcohol, wherein the replacement time is 24 hours each time, and then drying to obtain a silicon dioxide aerogel felt;
(4) purging the silica aerogel felt obtained in the step (3) to remove surface floating powder;
(5) respectively carrying out irradiation treatment on the front surface and the back surface of the silica aerogel felt obtained in the step (4) through electron beams, wherein the irradiation dose is 3 kGy, and the time is 2 min;
(6) and (3) respectively and uniformly spraying the waterborne polyurethane emulsion with the viscosity range of 75 Pa & s on the front surface and the back surface of the silica aerogel felt obtained in the step (5), and drying to obtain the anti-dusting aerogel felt.
Example 3
A preparation method of an anti-dusting aerogel felt comprises the following steps:
(1) taking tetraethoxysilane, absolute ethyl alcohol and water to be uniformly mixed, and then sequentially adding 2 mol/L NH4Uniformly stirring the solution F and 0.2 moL/L ammonia water to obtain silicon dioxide sol; wherein, in terms of molar ratio, the ethyl orthosilicate, the absolute ethyl alcohol and the water are = 1: 8: 3; NH (NH)4The amount of the F solution added is such that the molar ratio of NH is4Ethyl orthosilicate = 0.006: 1; the addition of ammonia water ensures that NH is calculated by molar ratio3Ethyl orthosilicate = 0.012: 1;
(2) soaking a glass fiber felt in the silica sol obtained in the step (1) for 24 hours, and then standing and aging at 50 ℃ for 24 hours;
(3) placing the glass fiber mat obtained in the step (2) in a modifying solution for hydrophobic modification treatment for 18 hours, wherein the modifying solution is a mixed solution of a modifying agent and absolute ethyl alcohol according to a molar ratio of 1: 3, and the modifying agent is trimethylchlorosilane; after the hydrophobic modification treatment is finished, then carrying out solvent replacement for 3 times by using absolute ethyl alcohol, wherein the replacement time is 30 hours each time, and then drying to obtain a silicon dioxide aerogel felt;
(4) purging the silica aerogel felt obtained in the step (3) to remove surface floating powder;
(5) respectively carrying out irradiation treatment on the front surface and the back surface of the silica aerogel felt obtained in the step (4) through electron beams, wherein the irradiation dose is 5 kGy, and the time is 2 min;
(6) and (3) respectively and uniformly spraying the water-based acrylate emulsion with the viscosity range of 80 Pa.s on the front surface and the back surface of the silica aerogel felt obtained in the step (5), and drying to obtain the anti-dusting aerogel felt.
Claims (6)
1. The preparation method of the powder falling prevention aerogel felt is characterized by comprising the following steps:
(1) mixing orthosilicate ester, ethanol and water uniformly, and then adding NH in sequence4Uniformly stirring the solution F and ammonia water to obtain silicon dioxide sol; wherein the content of the first and second substances,in a molar ratio, orthosilicate ester, ethanol and water = 1: 4-12: 2-4; NH (NH)4The amount of the F solution added is such that the molar ratio of NH is4F, orthosilicate ester = (0.002-0.01): 1; the addition of ammonia water ensures that NH is calculated by molar ratio3Orthosilicate = (0.005-0.015) 1;
(2) soaking the fibrofelt in the silica sol obtained in the step (1), and then statically aging for 8-24 h at 30-60 ℃;
(3) carrying out hydrophobic modification treatment on the fiber felt obtained in the step (2), then carrying out solvent replacement by using absolute ethyl alcohol, and drying to obtain a silicon dioxide aerogel felt;
(4) purging the silica aerogel felt obtained in the step (3) to remove surface floating powder;
(5) respectively carrying out irradiation treatment on the front surface and the back surface of the silica aerogel felt obtained in the step (4) through electron beams; wherein the irradiation dose of the electron beam is 1-5 kGy, and the time is 1-5 min;
(6) and (5) respectively and uniformly spraying the water-based adhesive on the front surface and the back surface of the silica aerogel felt obtained in the step (5), and drying to obtain the powder falling prevention aerogel felt.
2. The method of making an anti-dusting aerogel blanket of claim 1, comprising: in the step (1), the orthosilicate is tetraethoxysilane or methyl orthosilicate.
3. The method of making an anti-dusting aerogel blanket of claim 1, comprising: in the step (2), the time for dipping the fiber felt into the silica sol is 12-24 hours.
4. The method of making an anti-dusting aerogel blanket of claim 1, comprising: in the step (3), the fiber felt obtained in the step (2) is placed in a modification liquid for hydrophobic modification treatment for 12-24 hours, wherein the modification liquid is a mixed liquid composed of a modifier and absolute ethyl alcohol according to the molar ratio of 1: 2-5, and the modifier is hexamethyldisiloxane or trimethylchlorosilane.
5. The method of making an anti-dusting aerogel blanket of claim 1, comprising: in the step (3), the replacement times of the absolute ethyl alcohol are 2-3 times, and the time of each replacement is 12-36 hours.
6. The method of making an anti-dusting aerogel blanket of claim 1, comprising: in the step (6), the aqueous adhesive is an aqueous acrylic emulsion, an aqueous acrylic ester emulsion, an aqueous polyurethane emulsion or an aqueous epoxy resin emulsion, and the viscosity range of the aqueous adhesive is 70-80 Pa.s.
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| CN113620643B (en) * | 2021-09-18 | 2023-02-14 | 巩义市泛锐熠辉复合材料有限公司 | Preparation method of powder falling prevention silicon dioxide aerogel felt |
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