CN107286475B - Polypropylene foam material and preparation method thereof - Google Patents

Polypropylene foam material and preparation method thereof Download PDF

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Publication number
CN107286475B
CN107286475B CN201710656429.XA CN201710656429A CN107286475B CN 107286475 B CN107286475 B CN 107286475B CN 201710656429 A CN201710656429 A CN 201710656429A CN 107286475 B CN107286475 B CN 107286475B
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parts
polypropylene
weight
foaming
foaming agent
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CN107286475A (en
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冷栋梁
闫达
陈丁猛
杨丽含
刘东方
常秀娟
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Tianjin Dalin New Material Technology Co ltd
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Tianjin Dalin New Material Technology Co ltd
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/141—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • C—CHEMISTRY; METALLURGY
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    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/08—Supercritical fluid
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
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    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/18—Binary blends of expanding agents
    • C08J2203/182—Binary blends of expanding agents of physical blowing agents, e.g. acetone and butane
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
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    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/10—Homopolymers or copolymers of propene
    • C08J2423/12—Polypropene
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    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/10—Homopolymers or copolymers of propene
    • C08J2423/14—Copolymers of propene
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/14—Applications used for foams
    • C—CHEMISTRY; METALLURGY
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)
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    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/10—Peculiar tacticity
    • C08L2207/14—Amorphous or atactic polypropylene

Abstract

The invention provides a polypropylene foam material and a preparation method thereof, wherein the polypropylene foam material comprises the following components in parts by weight: matrix resin: 30-70 parts of high-melt-strength polypropylene, 10-50 parts of polypropylene random copolymer and 5-30 parts of low-density polyethylene; a gas nucleating agent: adding 0.1-0.5 part by weight of gas nucleating agent into 100 parts by weight of matrix resin; physical foaming agent: 5-16 parts by weight of a hair foaming agent is added in 100 parts by weight of the matrix resin; antioxidant: 0.5-1 part by weight of the resin is added into 100 parts by weight of the matrix resin; cell stabilizer: 1 to 10 parts by weight of the resin is added to 100 parts by weight of the matrix resin. The polypropylene foaming material disclosed by the invention has the advantages of good uniformity of foam holes, high foam hole density and no secondary environmental pollution.

Description

Polypropylene foam material and preparation method thereof
Technical Field
The invention belongs to the field of foaming materials, and particularly relates to a polypropylene foaming material and a method for preparing a polypropylene foaming sheet or plate by a physical method.
Background
The foamed plastic is a polymer material formed by dispersing a large number of gas micropores in solid plastic, has the characteristics of light weight, heat insulation, sound absorption, shock absorption, corrosion resistance, low price and the like, and has dielectric properties superior to matrix resin, so the foamed plastic is widely applied to the fields of daily packaging, agriculture, industry, aerospace, transportation industry, military industry and the like.
The polypropylene foaming material (EPP) is a high-crystallinity polypropylene/gas composite material with excellent performance, and becomes a novel environment-friendly compression-resistant buffering and heat-insulating material which is the fastest growing in recent years due to the unique performance of the polypropylene foaming material. The EPP product has excellent shock resistance and energy absorption performance, rebound resilience, high temperature resistance, chemical resistance, oil resistance and heat insulation.
The three types of foams with the largest use amount at present are mainly as follows: polyurethane (PU) foam, Polystyrene (PS) foam, Polyethylene (PE) foam. Isocyanate which influences human health is remained in the polyurethane foam, and the isocyanate cannot be recycled; polystyrene uses freon as a foaming agent, so that the environment is seriously polluted, and meanwhile, the waste of the polystyrene product is large in volume, difficult to degrade and recycle, so that the polystyrene product causes white pollution to the surrounding environment; the polyethylene foam plastic has excellent chemical corrosion resistance, shock absorption, no toxicity in combustion and easy recycling, but has the defects of low mechanical property, poor heat resistance and difficult degradation, thereby limiting the wide application of the polyethylene foam plastic. EPP is a new foam plastic in recent years, compared with other foam plastics, EPP products not only have excellent mechanical properties and thermal properties, but also have excellent environmental protection properties such as recoverability, degradability and the like, and are widely applied by people.
Compared with polyurethane foam, polystyrene foam and polyethylene foam, polypropylene plastic has many advantages:
1. the product has excellent heat insulation performance due to the closed pore structure, and can resist the temperature of 130 ℃;
2. the material is soft and elastic, and the product has certain bearing capacity and excellent durability, such as ultraviolet exposure resistance, physical damage resistance, extreme temperature (-40-130 ℃), oil resistance, water resistance, chemical resistance and the like.
3. The EPP product is an environment-friendly product and is easy to degrade, recycle and reuse.
However, most of the existing polypropylene foaming materials have poor uniformity of foam pores, large diameter of the foam pores, poor toughness and obvious insufficient low temperature resistance, thereby limiting the application field of the materials; and the preparation method is a chemical method, which causes certain environmental pollution.
Disclosure of Invention
In view of the above, the present invention is directed to provide a polypropylene foam material, which overcomes the defects of the prior art, has good uniformity of cells and high cell density, and does not cause secondary environmental pollution.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the polypropylene foaming material comprises the following components in parts by weight:
matrix resin: 30-70 parts of high-melt-strength polypropylene, 10-50 parts of polypropylene random copolymer and 5-30 parts of low-density polyethylene;
a gas nucleating agent: adding 0.1-0.5 part by weight of gas nucleating agent into 100 parts by weight of matrix resin;
physical foaming agent: 5-16 parts by weight of a hair foaming agent is added in 100 parts by weight of the matrix resin;
antioxidant: 0.5-1 part by weight of the resin is added into 100 parts by weight of the matrix resin;
cell stabilizer: 1 to 10 parts by weight of the resin is added to 100 parts by weight of the matrix resin.
Preferably, the content of each component of the matrix resin is as follows: 38-62 parts of high melt strength polypropylene, 20-45 parts of polypropylene copolymer and 10-25 parts of low density polyethylene.
Preferably, the content of each component of the matrix resin is as follows: 45-55 parts of high-melt-strength polypropylene, 30-40 parts of polypropylene copolymer and 15-20 parts of low-density polyethylene.
Preferably, the high melt strength polypropylene has a melt strength of 20-50 cN and a melt index of 1-6 g/10 min; the melt index of the copolymerized polypropylene is 2-8 g/10 min; the low density polyethylene has a melt index of 0.5 to 4g/10 min.
Preferably, the gas nucleating agent is one or more than two of calcium carbonate, talcum powder, silicon dioxide and mica; the mesh number of the gas nucleating agent is 800-3000 meshes.
Preferably, the physical foaming agent is one or more of supercritical carbon dioxide, supercritical nitrogen and supercritical butane.
Preferably, the antioxidant is one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, tris [2, 4-di-tert-butylphenyl ] phosphite and bis (2, 4-di-tert-butylphenyl) propionate ] pentaerythritol diphosphite; the cell stabilizer is one or more than two of monoglyceride and stearic acid.
The polypropylene resin hardly flows before the temperature reaches the melting point, when the temperature is higher than the melting point, the melt strength of the polymer is sharply reduced, and when the melt pressure is greatly reduced, the foaming agent in the system is hardly covered by the common polypropylene type. As is known, the compatibility between polypropylene and polyethylene is poor, and the addition of the polypropylene copolymer with a special structure can obviously improve the compatibility between polyethylene and polypropylene, promote the formation of a homogeneous system and improve the performance of the material. The pure polypropylene foaming material has poor toughness and obvious insufficient low-temperature resistance, and in order to improve the defect of the material, the defect of the pure polypropylene foaming material can be obviously improved by introducing the polyethylene resin into the formula design of the foaming material, so that the application field of the material is further expanded.
Another object of the present invention is to provide a method for preparing the polypropylene foam material, so as to prepare the polypropylene foam material.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a preparation method for preparing the polypropylene foaming material comprises the following steps:
(1) adding high melt strength polypropylene, polypropylene random copolymer, low density polyethylene and gas nucleating agent in a certain ratio into a special foaming extruder, and stirring at the temperature of 200-230 ℃ at the rotating speed of 20-40 r/min until the material reaches a molten state;
(2) after the materials in the step (1) are completely melted, injecting a physical foaming agent, a cell stabilizer and an antioxidant, and forming a polymer/physical foaming agent homogeneous system by the mixed materials under the rotation action of a screw;
(3) and (3) pushing the polymer/physical foaming agent homogeneous system in the step (2) to a die cast through a single-screw extruder for extrusion, foaming the system, and forming the polypropylene foaming material after the temperature is reduced.
Preferably, the preparation method of the polypropylene foam material further comprises a step (4) of collecting the polypropylene foam material in the step (3) into a roll or a plate under the action of a sizing device, a flattening device and a tension control device.
Preferably, screw stirring is adopted in the step (1).
The invention adopts a direct extrusion method to prepare the polypropylene foaming material, and the foaming agent is an environment-friendly foaming agent. In the preparation process, matrix resin and a gas nucleating agent are added into a special foaming extruder according to a certain proportion, a certain proportion of a foam stabilizer and a foaming agent are injected after materials are melted, the materials are fully mixed by the extruder and then extruded from a die, and the volume of the foaming agent in the system is rapidly expanded to form bubbles due to the rapid reduction of pressure, so that the volume of a polymer is driven to expand, and a foamed product is formed. Wherein, after the homogeneous phase system in the extruder is formed, the next key step is to nucleate the foam cells, and the most common thermoplastic plastic nucleation models comprise three types, namely a homogeneous nucleation theory, a heterogeneous nucleation theory and a mixed nucleation theory; the most common of the three nucleation theories is the heterogeneous nucleation theory, mainly because the heterogeneous nucleation occurs in a place with less energy required for nucleation, the plastic material is originally saved in various additives and is not a pure homogeneous system, and the gas nucleating agent is added to further increase the nucleation number of the heterogeneous nucleation, thereby increasing the material multiplying power.
Compared with the prior art, the polypropylene foaming material has the following advantages:
(1) the density of the polypropylene foaming material of the invention is 0.03-0.50 g/cm3Cell density of 102～109Individual cell/cm3The diameter of the foam hole is 9 mu m-2 mm, and the thickness of the foam product is 0.5-50 mm. The polypropylene foaming material belongs to a non-crosslinked product, can be recycled by 100 percent, does not cause secondary pollution, and meets the requirement of circular economy. The polypropylene foaming material prepared by the invention can be widely applied to the fields of heat-insulating tableware, automotive upholsteries, packaging and the like.
(2) The polypropylene foaming material disclosed by the invention adopts supercritical butane as a physical foaming agent, the boiling point of the supercritical butane is lower than that of pentane, and the foaming ratio of the product is larger.
Compared with the prior art, the preparation method of the polypropylene foaming material has the following advantages:
according to the preparation method of the polypropylene foaming material, the prepared polypropylene foaming material belongs to a non-crosslinked product, is completely melted at high temperature, can be recycled by 100%, does not cause secondary pollution, and meets the requirement of circular economy.
Drawings
FIG. 1 is a scanning electron microscope examination of a polypropylene foam according to example 1 of the present invention;
FIG. 2 is a scanning electron microscope examination of a polypropylene foam according to example 2 of the present invention;
FIG. 3 is a scanning electron microscope examination of a polypropylene foam according to example 3 of the present invention;
fig. 4 is a schematic view of the pore size of the polypropylene foam material according to embodiment 4 of the present invention.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following examples and accompanying drawings.
Example 1
The polypropylene foaming material comprises the following components in parts by weight:
matrix resin: 40 parts of high melt strength polypropylene, 40 parts of polypropylene random copolymer and 5-30 parts of low density polyethylene;
the gas nucleating agent is talcum powder: 0.2 part by weight of talcum powder is added into 100 parts by weight of matrix resin;
the physical foaming agent is supercritical butane: adding 15 parts by weight of supercritical butane to 100 parts by weight of the matrix resin;
the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester: 0.6 parts by weight per 100 parts by weight of the base resin;
the cell stabilizer is monoglyceride: 1.5 parts by weight per 100 parts by weight of the base resin.
The preparation method of the polypropylene foam material in the embodiment comprises the following steps:
(1) adding the high-melt-strength polypropylene, the polypropylene random copolymer, the low-density polyethylene and the gas nucleating agent in the ratio into a special foaming extruder through a feed inlet of the extruder, and stirring at the temperature of 200 ℃ and at the rotating speed of 20r/min by using a screw rod until the materials reach a molten state;
(2) after the materials in the step (1) are completely melted, injecting a physical foaming agent, a cell stabilizer and an antioxidant, and forming a polymer/physical foaming agent homogeneous system by the mixed materials under the rotation action of a screw;
(3) and (3) pushing the polymer/physical foaming agent homogeneous system in the step (2) to a die cast through a single-screw extruder for extrusion, foaming the system, and forming the polypropylene foaming material after the temperature is reduced.
(4) And (4) collecting the polypropylene foaming material in the step (3) into a coil under the action of a shaping device, a flattening device and a tension control device.
Example 2
The polypropylene foaming material comprises the following components in parts by weight:
matrix resin: 50 parts of high-melt-strength polypropylene, 45 parts of polypropylene random copolymer and 5 parts of low-density polyethylene;
the gas nucleating agent is a mixture of silicon dioxide and talcum powder in a ratio of 1: 4: 0.2 parts by weight per 100 parts by weight of the base resin;
the physical foaming agent is a mixture of supercritical carbon dioxide and supercritical butane 1: 6: adding 3 weight parts to 100 weight parts of matrix resin;
the antioxidant is beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-octadecyl ester: 0.6 parts by weight per 100 parts by weight of the base resin;
the cell stabilizer is monoglyceride: 1.1 parts by weight per 100 parts by weight of the base resin.
The preparation method of the polypropylene foam material in the embodiment comprises the following steps:
(1) adding the high-melt-strength polypropylene, the polypropylene random copolymer, the low-density polyethylene and the gas nucleating agent in the ratio into a special foaming extruder through a feed inlet of the extruder, and stirring at the temperature of 215 ℃ and the rotating speed of 30r/min by using a screw rod until the materials reach a molten state;
(2) after the materials in the step (1) are completely melted, injecting a physical foaming agent, a cell stabilizer and an antioxidant, and forming a polymer/physical foaming agent homogeneous system by the mixed materials under the rotation action of a screw;
(3) and (3) pushing the polymer/physical foaming agent homogeneous system in the step (2) to a die cast through a single-screw extruder for extrusion, foaming the system, and forming the polypropylene foaming material after the temperature is reduced.
(4) And (4) collecting the polypropylene foaming material in the step (3) into a plate under the action of a shaping device, a flattening device and a tension control device.
Example 3
The polypropylene foaming material comprises the following components in parts by weight:
matrix resin: 60 parts of high-melt-strength polypropylene, 30 parts of polypropylene random copolymer and 10 parts of low-density polyethylene;
the gas nucleating agent is talcum powder: 0.3 parts by weight per 100 parts by weight of the base resin;
the physical foaming agent is supercritical nitrogen: adding 5 parts by weight of supercritical nitrogen into 100 parts by weight of matrix resin;
the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester: 0.6 parts by weight per 100 parts by weight of the base resin;
the cell stabilizer is monoglyceride: 1.8 parts by weight per 100 parts by weight of the base resin.
The preparation method of the polypropylene foam material in the embodiment comprises the following steps:
(1) adding the high-melt-strength polypropylene, the polypropylene random copolymer, the low-density polyethylene and the gas nucleating agent in the ratio into a special foaming extruder through a feed inlet of the extruder, and stirring at the temperature of 230 ℃ and the rotating speed of 40r/min by using a screw rod until the materials reach a molten state;
(2) after the materials in the step (1) are completely melted, injecting a physical foaming agent, a cell stabilizer and an antioxidant, and forming a polymer/physical foaming agent homogeneous system by the mixed materials under the rotation action of a screw;
(3) and (3) pushing the polymer/physical foaming agent homogeneous system in the step (2) to a die cast through a single-screw extruder for extrusion, foaming the system, and forming the polypropylene foaming material after the temperature is reduced.
(4) And (4) collecting the polypropylene foaming material in the step (3) into a plate under the action of a shaping device, a flattening device and a tension control device.
Example 4
The polypropylene foaming material comprises the following components in parts by weight:
matrix resin: 35 parts of high-melt-strength polypropylene, 50 parts of polypropylene random copolymer and 15 parts of low-density polyethylene;
the gas nucleating agent is talcum powder: 0.15 parts by weight per 100 parts by weight of the base resin;
the physical foaming agent is supercritical nitrogen: adding 14 parts by weight of supercritical butane to 100 parts by weight of matrix resin;
the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester: 0.6 parts by weight per 100 parts by weight of the base resin;
the cell stabilizer is monoglyceride: 2.8 parts by weight per 100 parts by weight of the base resin.
The preparation method of the polypropylene foam material in the embodiment comprises the following steps:
(1) adding the high-melt-strength polypropylene, the polypropylene random copolymer, the low-density polyethylene and the gas nucleating agent in the ratio into a special foaming extruder through a feed inlet of the extruder, and stirring at the temperature of 230 ℃ and the rotating speed of 35r/min by using a screw rod until the materials reach a molten state;
(2) after the materials in the step (1) are completely melted, injecting a physical foaming agent, a cell stabilizer and an antioxidant, and forming a polymer/physical foaming agent homogeneous system by the mixed materials under the rotation action of a screw;
(3) and (3) pushing the polymer/physical foaming agent homogeneous system in the step (2) to a die cast through a single-screw extruder for extrusion, foaming the system, and forming the polypropylene foaming material after the temperature is reduced.
(4) And (4) collecting the polypropylene foaming material in the step (3) into a plate under the action of a shaping device, a flattening device and a tension control device.
Comparative example
A polypropylene foaming material comprises the following components in percentage by weight: matrix resin: 20 parts of high-melt-strength polypropylene, 70 parts of polypropylene copolymer and 10 parts of polypropylene homopolymer; every 100 weight parts of matrix resin is added with 0.5 weight part of talcum powder, 0.1 weight part of monoglyceride and 1 weight part of supercritical carbon dioxide.
And (3) performance detection:
the foamed materials in examples 1-4 and comparative example are subjected to performance detection, the scanning electron microscope pictures of examples 1-3 are shown in figures 1-3, and the pore diameter schematic diagram of example 4 is shown in figure 4; the results of other property measurements of the foams of examples 1-4 and comparative examples are shown in the following table.
Figure BDA0001369401040000101
All the raw materials and auxiliary materials are commercially available raw materials.
Detecting the number of foam holes of the foaming material: and quenching the prepared foaming material by liquid nitrogen, spraying gold on the fracture surface of the material in vacuum, testing by using SEM, and calculating the number of foam holes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (2)

1. A polypropylene foam material is characterized in that: the paint comprises the following components in parts by weight:
matrix resin: 50 parts of high-melt-strength polypropylene, 45 parts of polypropylene random copolymer and 5 parts of low-density polyethylene;
the gas nucleating agent is a mixture of silicon dioxide and talcum powder in a ratio of 1: 4: 0.2 parts by weight per 100 parts by weight of the base resin;
the physical foaming agent is a mixture of supercritical carbon dioxide and supercritical butane 1: 6: adding 3 weight parts to 100 weight parts of matrix resin;
the antioxidant is beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-octadecyl ester: 0.6 parts by weight per 100 parts by weight of the base resin;
the cell stabilizer is monoglyceride: 1.1 parts by weight per 100 parts by weight of the base resin;
the preparation method of the polypropylene foaming material comprises the following steps:
(1) adding the high-melt-strength polypropylene, the polypropylene random copolymer, the low-density polyethylene and the gas nucleating agent in the ratio into a special foaming extruder through a feed inlet of the extruder, and stirring at the temperature of 215 ℃ and the rotating speed of 30r/min by using a screw rod until the materials reach a molten state;
(2) after the materials in the step (1) are completely melted, injecting a physical foaming agent, a cell stabilizer and an antioxidant, and forming a polymer/physical foaming agent homogeneous system by the mixed materials under the rotation action of a screw;
(3) pushing the polymer/physical foaming agent homogeneous system in the step (2) to a die cast through a single-screw extruder for extrusion, foaming the system, and forming a polypropylene foaming material after the temperature is reduced;
(4) and (4) collecting the polypropylene foaming material in the step (3) into a plate under the action of a shaping device, a flattening device and a tension control device.
2. A polypropylene foam material is characterized in that: the paint comprises the following components in parts by weight:
matrix resin: 60 parts of high-melt-strength polypropylene, 30 parts of polypropylene random copolymer and 10 parts of low-density polyethylene;
the gas nucleating agent is talcum powder: 0.3 parts by weight per 100 parts by weight of the base resin;
the physical foaming agent is supercritical nitrogen: adding 5 parts by weight of supercritical nitrogen into 100 parts by weight of matrix resin;
the antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester: 0.6 parts by weight per 100 parts by weight of the base resin;
the cell stabilizer is monoglyceride: 1.8 parts by weight per 100 parts by weight of the base resin;
the preparation method of the polypropylene foaming material comprises the following steps:
(1) adding the high-melt-strength polypropylene, the polypropylene random copolymer, the low-density polyethylene and the gas nucleating agent in the ratio into a special foaming extruder through a feed inlet of the extruder, and stirring at the temperature of 230 ℃ and the rotating speed of 40r/min by using a screw rod until the materials reach a molten state;
(2) after the materials in the step (1) are completely melted, injecting a physical foaming agent, a cell stabilizer and an antioxidant, and forming a polymer/physical foaming agent homogeneous system by the mixed materials under the rotation action of a screw;
(3) pushing the polymer/physical foaming agent homogeneous system in the step (2) to a die cast through a single-screw extruder for extrusion, foaming the system, and forming a polypropylene foaming material after the temperature is reduced;
(4) and (4) collecting the polypropylene foaming material in the step (3) into a plate under the action of a shaping device, a flattening device and a tension control device.
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