CN114228287A - Weather-proof and high-bending-resistance polystyrene foaming co-extrusion composite material and preparation method thereof - Google Patents

Weather-proof and high-bending-resistance polystyrene foaming co-extrusion composite material and preparation method thereof Download PDF

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CN114228287A
CN114228287A CN202111635679.8A CN202111635679A CN114228287A CN 114228287 A CN114228287 A CN 114228287A CN 202111635679 A CN202111635679 A CN 202111635679A CN 114228287 A CN114228287 A CN 114228287A
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surface layer
extrusion
polystyrene
resistant
core material
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CN114228287B (en
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盛岳金
赵小亮
焦采之
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Huangshan Meissen New Material Technology Co ltd
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Huangshan Meissen New Material Technology Co ltd
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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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0014—Use of organic additives
    • C08J9/0028—Use of organic additives containing nitrogen
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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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
    • C08J9/06—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 chemical blowing agent
    • C08J9/08—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 chemical blowing agent developing carbon dioxide
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B32B2266/0228—Aromatic vinyl resin, e.g. styrenic (co)polymers
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/546—Flexural strength; Flexion stiffness
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
    • C—CHEMISTRY; METALLURGY
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    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • C08J2325/06—Polystyrene
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    • C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2427/22—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers modified by chemical after-treatment
    • C08J2427/24—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers modified by chemical after-treatment halogenated
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    • C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2451/04—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
    • C08J2463/04—Epoxynovolacs

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Abstract

The invention belongs to the field of composite materials, and particularly relates to a polystyrene foaming co-extrusion composite material with lasting bending resistance and weather resistance for outdoor use, and a preparation method of the composite material. The composite material is mainly obtained by co-extruding a co-extrusion surface layer and a core material, wherein the surface layer is composed of ASA resin and polycarbonate; the core material consists of BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general polystyrene, melamine, dicyandiamide, impact-resistant polystyrene, magnesium hydroxide and a foaming agent. The plate obtained after foaming, curing and forming has excellent bending resistance, lasting flame retardant property and weather resistance.

Description

Weather-proof and high-bending-resistance polystyrene foaming co-extrusion composite material and preparation method thereof
Technical Field
The invention belongs to the field of composite materials, and particularly relates to a weather-resistant and high-bending-resistant polystyrene foamed co-extruded composite material and a preparation method of the composite material.
Background
At present, in the field of composite materials, wood-plastic composite materials, composite floors, pure wood floors and the like are mainly used, wherein the wood floors or common composite floors are mainly used indoors, and the biggest problem is that the wood-plastic composite floors are afraid of water, are easy to bubble and rot when meeting water and have insufficient durability; the wood plastic is mainly used outdoors, although the water resistance of the wood plastic is improved to a certain extent, the wood plastic material contains a large amount of wood powder, so that the problems of microbial degradation, rot and the like exist when the wood plastic material is used outdoors, and meanwhile, the wood plastic material has heavier weight due to overlarge density and higher bearing requirements on supporting points. The full-plastic polystyrene foaming material has the advantages of good foaming effect, light weight and good water resistance, and is developed rapidly in recent years, but the self bending strength is insufficient, so that the full-plastic polystyrene foaming material cannot be used in fields with high bending resistance, such as the field of indoor and outdoor floors. Meanwhile, indoor and outdoor floors have higher requirements on flame retardance and weather resistance, and how to make full use of the indoor and outdoor floors is a difficult point.
Therefore, in view of the above defects, it is necessary to invent a weather-resistant and high-bending-resistant polystyrene foamed co-extruded composite material to realize a new application thereof in the field of indoor and outdoor floor panels.
Disclosure of Invention
In order to solve the problems, the invention relates to a weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material, which is obtained by co-extruding a co-extrusion surface layer and a core material, wherein the surface layer is composed of ASA resin and polycarbonate; the core material consists of BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general purpose transparent polystyrene (GPPS), melamine, dicyandiamide, High Impact Polystyrene (HIPS), magnesium hydroxide and a foaming agent.
In the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material, the weight parts of the raw materials are as follows: surface layer: 50-70 parts of ASA resin; 20-30 parts of polycarbonate;
core material: 10-17 parts of BPA novolac epoxy resin; 6-12 parts of triglycidyl isocyanurate; 10-15 parts of chlorinated polyvinyl chloride resin; 35-50 parts of General Purpose Polystyrene (GPPS); 2-4 parts of melamine; 1.5-3 parts of dicyandiamide; 15-22 parts of High Impact Polystyrene (HIPS); 8-15 parts of magnesium hydroxide; 2-3 parts of foaming agent.
Wherein: the mass of the surface layer accounts for 2-3% of the mass of the core material.
Among the above materials, BPA novolac epoxy resin preferably has an epoxy equivalent of 190-230 g/mol; the chlorinated polyvinyl chloride resin is in an extrusion grade; the foaming agent is sodium bicarbonate.
The preparation method of the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material comprises the following steps:
(1) fully and uniformly mixing ASA resin and polycarbonate particles at room temperature to obtain a premix, and then extruding and granulating the premix to obtain functional composite surface layer particles for later use;
(2) fully and uniformly mixing core material raw materials BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general polystyrene, melamine, dicyandiamide, high-impact polystyrene and a foaming agent at room temperature, and then crushing the mixture to 50-100 meshes by a high-speed crusher to prepare a core premix for later use;
(3) and respectively melting the core material premix and the co-extrusion surface layer particles through a double-screw extruder, then feeding the melted core material premix and the co-extrusion surface layer particles into a core material cavity and a surface layer cavity, and carrying out shaping, cooling and forming through a shaping mold and cutting at a fixed length to obtain the polystyrene foaming co-extrusion composite material.
Preferably, the conditions for the core material extrusion molding in the step (3) are as follows: the temperature of the machine barrel is 200-210 ℃, and the rotating speed of the screw is 10-15 rpm; the conditions of the surface layer extrusion molding are as follows: the temperature of the machine barrel is 260-270 ℃, and the rotating speed of the screw is 10-15 rpm.
Preferably, the barrel temperature of the twin-screw extruder in the step (1) is 250-270 ℃, and the screw rotating speed is 200-250 rpm.
In the scheme of the invention, the curing reaction is carried out on the mixture of BPA novolac epoxy resin with high epoxy functionality and triglycidyl isocyanurate with high nitrogen curing agents melamine and dicyandiamide when the core material is foamed and formed, so that the bending strength of the foamed polystyrene material is greatly improved, and the flame retardant property of the core material is improved; meanwhile, the magnesium hydroxide used as an inorganic flame retardant to replace common filler can improve the bending resistance and the flame retardance. The plate obtained after foaming, curing and forming has excellent bending resistance, lasting flame retardant property and weather resistance.
Detailed Description
The present invention will now be further described with reference to specific embodiments in order to enable those skilled in the art to better understand the present invention.
The raw material models and manufacturers/suppliers adopted by the invention are as follows:
ASA resin, available from Suzhou mutual Innovation materials, Inc., under the trademark PW-997S, manufactured by Taiwan Qimei corporation;
polycarbonate, model 2805, shanghai bayer corporation;
BPA novolac epoxy resin (model: SQAN-203, epoxy equivalent 190-;
chlorinated polyvinyl chloride resin (type extrusion grade, Shanghai Cincin New materials science and technology Co., Ltd.);
the rest are conventional commercial raw materials.
Example 1
A weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material is obtained by co-extruding a co-extrusion surface layer and a core material, wherein the surface layer is composed of ASA resin and polycarbonate; the core material consists of BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general purpose transparent polystyrene (GPPS), melamine, dicyandiamide, High Impact Polystyrene (HIPS), magnesium hydroxide and a foaming agent.
The weight parts of the raw materials are as follows: surface layer: ASA resin 50; a polycarbonate 22;
core material: BPA novolac epoxy resin 10; triglycidyl isocyanurate 6; chlorinated polyvinyl chloride resin 11; general Purpose Polystyrene (GPPS) 35; 2 parts of melamine; 1.5 parts of dicyandiamide; high Impact Polystyrene (HIPS) 15; magnesium hydroxide 9; and a foaming agent 2.
The foaming agent is sodium bicarbonate.
Wherein: the mass of the surface layer accounts for 2 percent of the mass of the core material.
The preparation method of the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material comprises the following steps:
(1) fully and uniformly mixing ASA resin and polycarbonate particles at room temperature to obtain a premix, and then extruding and granulating the premix to obtain functional composite surface layer particles for later use; the barrel temperature of the twin-screw extruder was 250 ℃ and the screw rotation speed was 200 rpm.
(2) Fully and uniformly mixing core material raw materials BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general polystyrene, melamine, dicyandiamide, high-impact polystyrene and a foaming agent at room temperature, and crushing the mixture to 60 meshes by a high-speed crusher to prepare a core premix for later use;
(3) and respectively melting the core material premix and the co-extrusion surface layer particles through a double-screw extruder, then feeding the melted core material premix and the co-extrusion surface layer particles into a core material cavity and a surface layer cavity, shaping through a shaping mold, cooling and forming, and cutting at a fixed length to obtain the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material. The conditions for extrusion molding of the core material are as follows: the temperature of the machine barrel is 200 ℃, and the rotating speed of the screw is 10 rpm; the conditions of the surface layer extrusion molding are as follows: the barrel temperature was 260 ℃ and the screw speed was 10 rpm.
Example 2
A weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material is obtained by co-extruding a co-extrusion surface layer and a core material, wherein the surface layer is composed of ASA resin and polycarbonate; the core material consists of BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general purpose transparent polystyrene (GPPS), melamine, dicyandiamide, High Impact Polystyrene (HIPS), magnesium hydroxide and a foaming agent.
The weight parts of the raw materials are as follows: surface layer: ASA resin 68; a polycarbonate 30;
core material: BPA novolac epoxy resin 17; triglycidyl isocyanurate 10; chlorinated polyvinyl chloride resin 15; general Purpose Polystyrene (GPPS) 48; melamine 4; dicyandiamide 3; high Impact Polystyrene (HIPS) 20; 14 parts of magnesium hydroxide; a blowing agent 3.
The foaming agent is sodium bicarbonate.
Wherein: the mass of the surface layer accounts for 3 percent of the mass of the core material.
The preparation method of the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material comprises the following steps:
(1) fully and uniformly mixing ASA resin and polycarbonate particles at room temperature to obtain a premix, and then extruding and granulating the premix to obtain functional composite surface layer particles for later use; the barrel temperature of the twin-screw extruder was 270 ℃ and the screw rotation speed was 250 rpm.
(2) Fully and uniformly mixing core material raw materials BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general polystyrene, melamine, dicyandiamide, high-impact polystyrene and a foaming agent at room temperature, and crushing the mixture to 70 meshes by a high-speed crusher to prepare a core premix for later use;
(3) and respectively melting the core material premix and the co-extrusion surface layer particles through a double-screw extruder, then feeding the melted core material premix and the co-extrusion surface layer particles into a core material cavity and a surface layer cavity, shaping through a shaping mold, cooling and forming, and cutting at a fixed length to obtain the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material. The conditions for extrusion molding of the core material are as follows: the barrel temperature is 210 ℃, and the screw rotation speed is 15 rpm; the conditions of the surface layer extrusion molding are as follows: the barrel temperature was 270 ℃ and the screw speed was 15 rpm.
Example 3
A weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material is obtained by co-extruding a co-extrusion surface layer and a core material, wherein the surface layer is composed of ASA resin and polycarbonate; the core material consists of BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general purpose transparent polystyrene (GPPS), melamine, dicyandiamide, High Impact Polystyrene (HIPS), magnesium hydroxide and a foaming agent.
The weight parts of the raw materials are as follows: surface layer: ASA resin 60; polycarbonate 25;
core material: BPA novolac epoxy resin 14; triglycidyl isocyanurate 9; chlorinated polyvinyl chloride resin 12; general Purpose Polystyrene (GPPS) 43; melamine 4; dicyandiamide 3; high Impact Polystyrene (HIPS) 18; 12 parts of magnesium hydroxide; a blowing agent 3.
The foaming agent is sodium bicarbonate.
Wherein: the mass of the surface layer accounts for 2.5 percent of the mass of the core material.
The preparation method of the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material comprises the following steps:
(1) fully and uniformly mixing ASA resin and polycarbonate particles at room temperature to obtain a premix, and then extruding and granulating the premix to obtain functional composite surface layer particles for later use; the barrel temperature of the twin-screw extruder was 260 ℃ and the screw speed was 225 rpm.
(2) Fully and uniformly mixing core material raw materials BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general polystyrene, melamine, dicyandiamide, high-impact polystyrene and a foaming agent at room temperature, and then crushing the mixture to 90 meshes by a high-speed crusher to prepare a core premix for later use;
(3) and respectively melting the core material premix and the co-extrusion surface layer particles through a double-screw extruder, then feeding the melted core material premix and the co-extrusion surface layer particles into a core material cavity and a surface layer cavity, shaping through a shaping mold, cooling and forming, and cutting at a fixed length to obtain the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material. The conditions for extrusion molding of the core material are as follows: the barrel temperature was 205 ℃ and the screw speed was 13 rpm; the conditions of the surface layer extrusion molding are as follows: the barrel temperature was 265 ℃ and the screw speed was 12 rpm.
Example 4
A weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material is obtained by co-extruding a co-extrusion surface layer and a core material, wherein the surface layer is composed of ASA resin and polycarbonate; the core material consists of BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general purpose transparent polystyrene (GPPS), melamine, dicyandiamide, High Impact Polystyrene (HIPS), magnesium hydroxide and a foaming agent.
The weight parts of the raw materials are as follows: surface layer: ASA resin 58; a polycarbonate 27;
core material: BPA novolac epoxy resin 15; triglycidyl isocyanurate 9; chlorinated polyvinyl chloride resin 15; general Purpose Polystyrene (GPPS) 42; melamine 4; dicyandiamide 3; high Impact Polystyrene (HIPS) 19; 14 parts of magnesium hydroxide; and a foaming agent 2.
The foaming agent is sodium bicarbonate.
Wherein: the mass of the surface layer accounts for 2.5 percent of the mass of the core material.
The preparation method of the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material comprises the following steps:
(1) fully and uniformly mixing ASA resin and polycarbonate particles at room temperature to obtain a premix, and then extruding and granulating the premix to obtain functional composite surface layer particles for later use; the barrel temperature of the twin-screw extruder was 260 ℃ and the screw speed was 240 rpm.
(2) Fully and uniformly mixing core material raw materials BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general polystyrene, melamine, dicyandiamide, high-impact polystyrene and a foaming agent at room temperature, and then crushing the mixture to 80 meshes by a high-speed crusher to prepare a core premix for later use;
(3) and respectively melting the core material premix and the co-extrusion surface layer particles through a double-screw extruder, then feeding the melted core material premix and the co-extrusion surface layer particles into a core material cavity and a surface layer cavity, shaping through a shaping mold, cooling and forming, and cutting at a fixed length to obtain the weather-resistant and high-bending-resistant polystyrene foaming co-extrusion composite material. The conditions for extrusion molding of the core material are as follows: the barrel temperature is 210 ℃, and the screw rotation speed is 15 rpm; the conditions of the surface layer extrusion molding are as follows: the barrel temperature was 270 ℃ and the screw speed was 15 rpm.
Comparative example 1
The other example is the same as example 1 except that instead of using a high functionality BPA novolac epoxy resin, a conventional E-12 epoxy resin is used instead.
Comparative example 2
Otherwise, the difference from example 1 is that the preparation method does not require the preparation of 50-100 mesh powder, but the pre-mixing is directly carried out in a granular state and then the high temperature molding is carried out.
After the composite material is applied to a plate, the performance of the composite material is detected as follows:
the bending strength is detected according to the 6.3.3 part of the GB/T24137-2009 standard;
the weather resistance test is carried out according to GB/T29365-.
The temperature difference resistance test is carried out according to the following method, namely (23 +/-2) DEG C, 5h → (-15 +/-2) DEG C, 5h → (23 +/-2) DEG C, 5h, 15h are 1 cycle, and whether the plate has cracks or crazing conditions is observed after 8 cycles are continuously carried out according to the temperature difference cycle. The flame retardant property test of the core material is carried out according to GB-T2406.2-2009;
table 1 comparison of the properties of the sheets of the examples and the comparative examples
Figure BDA0003442041360000071
Figure BDA0003442041360000081
Figure BDA0003442041360000091
The bending strength of the boards in the embodiments 1-4 is greater than 95Mpa, and as the BPA novolac epoxy resin with high epoxy functionality and triglycidyl isocyanurate participate in curing with the amine curing system, the bending strength of the boards is far greater than that of the ordinary plastic-wood boards, and the bending strength of the boards can completely meet the bending requirement of the ordinary floors; the surface layer adopts ASA resin and polycarbonate resin, the resin composition has relatively good flame retardant property, the oxygen index is generally about 24%, the weather resistance of the surface layer is excellent, the surface layer does not change after 120h weather resistance test, no crack exists between the core material and the surface layer, the flame retardant property of the core material is good, and the oxygen index is basically more than 30%; after 8 cycles of temperature difference resistance test, no crack appears on the whole plate surface and the section, which shows that the product of the invention has excellent comprehensive performance and great potential of application value. Comparative example 1 after using ordinary linear epoxy resin to replace BPA novolac epoxy resin of high functionality, because the reduction of cross-linking density, the bending strength of the board is reduced obviously, can't meet the positioning requirement of the invention; the process adopted in comparative example 2 cannot achieve sufficient material compatibility, so that the materials cannot be fully cured in the molding process, and the molding defect is caused.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (7)

1. A weather-resistant and high-bending-resistance polystyrene foaming co-extrusion composite material is characterized in that the material is obtained by co-extruding a co-extrusion surface layer and a core material, wherein the surface layer is composed of ASA resin and polycarbonate; the core material consists of BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general polystyrene, melamine, dicyandiamide, high-impact polystyrene, magnesium hydroxide and a foaming agent.
2. The weather-resistant high-bending-resistance polystyrene foaming co-extrusion composite material as claimed in claim 1, wherein the composite material comprises the following raw materials in parts by weight:
surface layer: 50-70 parts of ASA resin; 20-30 parts of polycarbonate;
core material: 10-17 parts of BPA novolac epoxy resin; 6-12 parts of triglycidyl isocyanurate; 10-15 parts of chlorinated polyvinyl chloride resin; 35-50 parts of general polystyrene; 2-4 parts of melamine; 1.5-3 parts of dicyandiamide; 15-22 parts of high impact polystyrene; 8-15 parts of magnesium hydroxide; 2-3 parts of foaming agent. Wherein: the mass of the surface layer accounts for 2-3% of the mass of the core material.
3. The weather-resistant highly bending-resistant polystyrene foaming co-extrusion composite material as claimed in claim 1 and 2, wherein the epoxy equivalent of the BPA novolac epoxy resin is 190-230 g/mol.
4. The weather-resistant high bending-resistant polystyrene foaming co-extrusion composite material as claimed in claim 1 and 2, wherein the chlorinated polyvinyl chloride resin is extrusion grade; the foaming agent is sodium bicarbonate.
5. The method for preparing the weather-resistant and high bending-resistant polystyrene foaming co-extrusion composite material as claimed in claims 1-4, which comprises the following steps:
(1) fully and uniformly mixing ASA resin and polycarbonate particles at room temperature to obtain a premix, and then extruding and granulating the premix to obtain functional composite surface layer particles for later use;
(2) fully and uniformly mixing core material raw materials BPA novolac epoxy resin, triglycidyl isocyanurate, chlorinated polyvinyl chloride resin, general polystyrene, melamine, dicyandiamide, high-impact polystyrene and a foaming agent at room temperature, and then crushing the mixture to 50-100 meshes by a high-speed crusher to prepare a core premix for later use;
(3) respectively melting the core material premix and the co-extrusion surface layer particles through a double-screw extruder, then feeding the melted core material premix and the co-extrusion surface layer particles into a core material cavity and a surface layer cavity, and carrying out shaping, cooling and forming through a shaping mold and cutting at a fixed length to obtain the polystyrene foaming co-extrusion composite material according to the claims 1-4.
6. The method for preparing the weather-resistant and high bending-resistant polystyrene foaming co-extrusion composite material according to claim 5, preferably, the conditions for the core material extrusion molding in the step (3) are as follows: the temperature of the machine barrel is 200-210 ℃, and the rotating speed of the screw is 10-15 rpm; the conditions of the surface layer extrusion molding are as follows: the temperature of the machine barrel is 260-270 ℃, and the rotating speed of the screw is 10-15 rpm.
7. The method for preparing the weather-resistant and high bending-resistant polystyrene foaming co-extrusion composite material according to claim 5, wherein the barrel temperature of the twin-screw extruder in the step (1) is 250-270 ℃, and the screw rotation speed is 200-250 rpm.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0541504A1 (en) * 1991-11-07 1993-05-12 Monsanto Europe S.A./N.V. Plastic article having flame retardant properties
CN110293728A (en) * 2019-07-01 2019-10-01 黄山美森新材料科技有限公司 A kind of high temperature resistant co-extrusion type foamed polystyrene composite material and preparation method
CN113292797A (en) * 2021-05-25 2021-08-24 黄山美森新材料科技股份有限公司 High-strength low-thermal-expansion high-low-temperature-resistant excellent polystyrene micro-foaming material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0541504A1 (en) * 1991-11-07 1993-05-12 Monsanto Europe S.A./N.V. Plastic article having flame retardant properties
CN110293728A (en) * 2019-07-01 2019-10-01 黄山美森新材料科技有限公司 A kind of high temperature resistant co-extrusion type foamed polystyrene composite material and preparation method
CN113292797A (en) * 2021-05-25 2021-08-24 黄山美森新材料科技股份有限公司 High-strength low-thermal-expansion high-low-temperature-resistant excellent polystyrene micro-foaming material

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