CN110628113A - Low-heat-absorption type multilayer co-extrusion wood-plastic profile and preparation method thereof - Google Patents
Low-heat-absorption type multilayer co-extrusion wood-plastic profile and preparation method thereof Download PDFInfo
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- CN110628113A CN110628113A CN201910932804.8A CN201910932804A CN110628113A CN 110628113 A CN110628113 A CN 110628113A CN 201910932804 A CN201910932804 A CN 201910932804A CN 110628113 A CN110628113 A CN 110628113A
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- 239000004033 plastic Substances 0.000 title claims abstract description 73
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 46
- 238000001125 extrusion Methods 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title description 9
- 239000011162 core material Substances 0.000 claims abstract description 27
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 26
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 15
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- 238000007731 hot pressing Methods 0.000 claims description 12
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- 235000011613 Pinus brutia Nutrition 0.000 claims description 8
- 241000219000 Populus Species 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
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- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 claims description 4
- NNSIWZRTNZEWMS-UHFFFAOYSA-N cobalt titanium Chemical compound [Ti].[Co] NNSIWZRTNZEWMS-UHFFFAOYSA-N 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 3
- 238000009413 insulation Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 19
- 238000011056 performance test Methods 0.000 description 4
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- 239000004566 building material Substances 0.000 description 2
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- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920001587 Wood-plastic composite Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000016776 visual perception Effects 0.000 description 1
- 239000011155 wood-plastic composite Substances 0.000 description 1
Classifications
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- B32B7/04—Interconnection of layers
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- 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
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Fluid Mechanics (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a low-heat-absorption multilayer co-extrusion wood-plastic profile which comprises a core material, an outer layer I and an outer layer II, wherein the outer layer II comprises the following raw materials in parts by weight: 30-40 parts of high-density polyethylene, 10-20 parts of first plant fiber, 5-8 parts of superfine glass wool, 5-8 parts of high-silicon cotton, 3-5 parts of calcium carbonate, 2-3 parts of coupling agent and 3-5 parts of compatilizer, wherein the first outer layer comprises the following raw materials in parts by weight: 15-20 parts of high-density polyethylene, 8-15 parts of plant fiber II, 1-2 parts of antioxidant, 2-3 parts of compatilizer, 1-2 parts of stabilizer, 1-2 parts of coupling agent, 2-6 parts of infrared reflection pigment, 1-2 parts of anti-ultraviolet agent and 1-2 parts of talcum powder. The wood-plastic section bar has the advantages of strong ultraviolet reflection capability, good heat insulation performance and strong heat insulation capability, and greatly prolongs the service life of the section bar.
Description
Technical Field
The invention belongs to the technical field of wood-plastic composite materials, and particularly relates to a low-heat-absorption multi-layer co-extrusion wood-plastic profile and a preparation method thereof.
Background
The energy of the sun reaches the earth surface and is divided into three parts: UV-about 5%, which is an important factor in ageing the material, visible light-about 50%, which gives us a visual perception of the colour of the material, and IR-about 45%, which raises the temperature of the material. For building materials used outdoors, absorption of infrared light generates infrared energy, i.e., heat, which raises the temperature of the building material. The temperature rise of the material will increase the aging of the material, influence the performances of thermal deformation and the like, and shorten the service life of the material. The existing wood-plastic section is laid outdoors and exposed to sunlight for a long time, and the wood-plastic material absorbs a large amount of sunlight energy to accelerate the aging of wood and plastic and shorten the service life of the wood-plastic section. Some materials have the function of reflecting infrared rays to reduce the absorption of the infrared rays, and some materials have strong heat insulation effect. If the materials can be added into the wood-plastic section and play a role, the absorption of heat can be greatly reduced, ultraviolet rays are greatly reflected, and the service life of the wood-plastic section is prolonged.
Disclosure of Invention
The invention aims to solve the problems and provides a low-heat-absorption multilayer co-extrusion wood-plastic profile and a preparation method thereof.
The invention provides a low-heat-absorption multilayer co-extrusion wood-plastic profile which comprises a core material, an outer layer I and an outer layer II, wherein the outer layer II is hot-pressed on the core material, the outer layer I is hot-pressed on the outer layer II, and the outer layer II comprises the following raw materials in parts by weight: 30-40 parts of high-density polyethylene, 10-20 parts of first plant fiber, 5-8 parts of superfine glass wool, 5-8 parts of high-silicon cotton, 3-5 parts of calcium carbonate, 2-3 parts of coupling agent and 3-5 parts of compatilizer, wherein the first outer layer comprises the following raw materials in parts by weight: 15-20 parts of high-density polyethylene, 8-15 parts of plant fiber II, 1-2 parts of antioxidant, 2-3 parts of compatilizer, 1-2 parts of stabilizer, 1-2 parts of coupling agent, 2-6 parts of infrared reflection pigment, 1-2 parts of anti-ultraviolet agent and 1-2 parts of talcum powder.
Preferably, the plant fiber is one or more of poplar powder, birch powder and pine powder.
As a further preferable means, the plant fiber is a mixture of plant straw powder and rice hull powder, and the mass ratio of the straw powder to the rice hull powder is 2: 1.
as a further preferred means, the compatibilizer is maleic anhydride grafted polyethylene.
As a further preferred means, the antioxidant is AT-168 and the anti-UV agent is UVP-327. AT-168 is tris (2, 4-di-tert-butylphenyl) phosphite and UVP-327 is 2- (2 ' -hydroxy-3 ', 5 ' -di-tert-phenyl) -5-chlorobenzotriazole.
As a further preferable means, the coupling agent is a silane coupling agent.
Preferably, the infrared reflection pigment is one of titanium dioxide, titanium-nickel yellow, ferrosilicon red and titanium-cobalt green.
A preparation method of a low-heat-absorption multilayer co-extrusion wood-plastic profile comprises the following specific steps:
1) soaking superfine glass wool and high-silicon cotton in a mixed solution of a coupling agent and maleic anhydride grafted polyethylene for 30-45min, heating for 2-3h at about 110 ℃, and then cooling to room temperature to obtain a treated low-heat-absorption raw material;
2) putting the high-density polyethylene into a granulator for extrusion granulation to form granular plastic, and crushing the plant fiber I and the plant fiber II into powder of 80-100 meshes;
3) mixing the low-heat-absorption raw material treated in the step 1), the particle plastic and the plant fiber powder in the step 2), calcium carbonate and maleic anhydride grafted polyethylene, adding the mixture into a double-screw extruder for melt blending and granulation, wherein the temperature of the extruder barrel is 190 ℃ at 150-;
4) mixing the granular plastic, the plant fiber second powder, the antioxidant, the maleic anhydride grafted polyethylene, the stabilizer, the coupling agent, the infrared reflection pigment, the ultraviolet resistant agent and the talcum powder in the step 2), adding the mixture into a double-screw extruder after mixing, carrying out melt blending and granulation, wherein the temperature of an extruder barrel is 160-200 ℃ and the temperature of a die is 190-240 ℃ to obtain outer-layer first section particles;
5) sucking outer-layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the outer-layer profile particles by the extruder, then feeding the outer-layer profile particles into a wood-plastic co-extrusion die, controlling the temperature at 170 ℃ and 190 ℃, hot-pressing the outer-layer profile particles onto the surface of a core material, and cooling; and sucking the particles of the outer-layer profile into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the particles by the extruder, then feeding the particles into a wood-plastic co-extrusion die, controlling the temperature at 170-190 ℃, hot-pressing the particles onto the surface of the outer layer, and cooling to form the low-heat-absorption multi-layer co-extrusion wood-plastic profile.
The invention has the beneficial effects that: 1. according to the invention, the two outer protection layers are hot-pressed outside the core material, the layer tightly attached to the core material has a good heat insulation effect, the outer layer has an ultraviolet ray reflection function, most of ultraviolet rays irradiated by the sun are reflected, and the two outer protection layers ensure that most of heat cannot enter the core material, so that the service life of the core material is prolonged. 2. The superfine glass wool and the high-silicon cotton are good heat insulation materials, can be well combined with polyethylene after being treated by the coupling agent and the maleic anhydride grafted polyethylene to exert the heat insulation performance of the wood-plastic section, and the infrared reflection pigment and the ultraviolet resistant agent are added in the outer layer I, so that most of ultraviolet rays and infrared rays can be reflected back, the damage of the ultraviolet rays to the section is reduced, the absorption of infrared heat is reduced, the temperature change range of the core material of the wood-plastic section in one day is small, and the service life of the core material is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a low heat absorption type multilayer co-extruded wood plastic profile of the present invention.
In the figure: 1. a core material; 2. an outer layer II; 3. and a first outer layer.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
example 1
The low-heat-absorption multilayer co-extrusion wood-plastic profile comprises a core material, a first outer layer and a second outer layer, wherein the second outer layer is hot-pressed on the core material, the first outer layer is hot-pressed on the second outer layer, and the second outer layer comprises the following raw materials in parts by weight: 30 parts of high-density polyethylene, 10 parts of poplar powder, 5 parts of superfine glass wool, 5 parts of high-silicon cotton, 3 parts of calcium carbonate, 2 parts of a silane coupling agent and 3 parts of maleic anhydride grafted polyethylene, wherein the first outer layer comprises the following raw materials in parts by weight: 15 parts of high-density polyethylene, 8 parts of plant straw powder and rice hull, AT-1681 part, 2 parts of maleic anhydride grafted polyethylene, AMO-951 parts, 1-2 parts of silane coupling agent, 2 parts of titanium dioxide, UVP-3271 parts and 1 part of talcum powder.
A preparation method of a low-heat-absorption multilayer co-extrusion wood-plastic profile comprises the following specific steps:
1) soaking superfine glass wool and high-silicon cotton in a mixed solution of a coupling agent and maleic anhydride grafted polyethylene for 30min, heating for 2h at about 110 ℃, and then cooling to room temperature to obtain a treated low-heat-absorption raw material;
2) putting the high-density polyethylene into a granulator for extrusion granulation to form granular plastic, and crushing poplar, plant straws and rice hulls into powder of 80-100 meshes;
3) mixing the low-heat-absorption raw material treated in the step 1) and the granular plastic in the step 2) with the poplar powder, calcium carbonate and maleic anhydride grafted polyethylene, adding the mixture into a double-screw extruder after mixing, carrying out melt blending and granulation, wherein the temperature of an extruder cylinder is 150 ℃, and the temperature of a die is 180 ℃, so as to obtain outer-layer profile particles;
4) mixing the granular plastic, the plant straw powder, the rice hull powder, the AT-168, the maleic anhydride grafted polyethylene, the AMO-95, the silane coupling agent, the titanium dioxide, the UVP-327 and the talcum powder in the step 2), adding the mixture into a double-screw extruder to perform melt blending and granulation, wherein the temperature of the extruder barrel is 160 ℃, and the temperature of a die is 190 ℃ to obtain outer-layer section particles;
5) sucking outer-layer profile material particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the profile material particles by the extruder, then feeding the profile material particles into a wood-plastic co-extrusion die, controlling the temperature at 170 ℃, hot-pressing the profile material particles onto the surface of a core material, and cooling; and sucking the particles of the outer-layer first profile into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the particles by the extruder, then feeding the particles into a wood-plastic co-extrusion die, controlling the temperature at 170 ℃, hot-pressing the particles onto the two surfaces of the outer layer, and cooling to form the low-heat-absorption multi-layer co-extrusion wood-plastic profile.
Table 1 example 1 performance test results of wood plastic profile
Example 2
The low-heat-absorption multilayer co-extrusion wood-plastic profile comprises a core material, a first outer layer and a second outer layer, wherein the second outer layer is hot-pressed on the core material, the first outer layer is hot-pressed on the second outer layer, and the second outer layer comprises the following raw materials in parts by weight: 40 parts of high-density polyethylene, 20 parts of birch powder, 8 parts of superfine glass wool, 8 parts of high-silicon cotton, 5 parts of calcium carbonate, 3 parts of a silane coupling agent and 5 parts of maleic anhydride grafted polyethylene, wherein the first outer layer comprises the following raw materials in parts by weight: 20 parts of high-density polyethylene, 15 parts of plant straw powder and rice hull, AT-1682 parts of maleic anhydride grafted polyethylene, AMO-952 parts of maleic anhydride, 2 parts of silane coupling agent, 6 parts of titanium-nickel yellow, UVP-3272 parts of talcum powder and 2 parts of talcum powder.
A preparation method of a low-heat-absorption multilayer co-extrusion wood-plastic profile comprises the following specific steps:
1) soaking superfine glass wool and high-silicon cotton in a mixed solution of a coupling agent and maleic anhydride grafted polyethylene for 45min, heating for 3h at about 110 ℃, and then cooling to room temperature to obtain a treated low-heat-absorption raw material;
2) putting the high-density polyethylene into a granulator for extrusion granulation to form granular plastic, and crushing birch, plant straws and rice hulls into powder of 80-100 meshes;
3) mixing the low heat absorption raw material treated in the step 1), the particle plastic in the step 2), birch wood powder, calcium carbonate and maleic anhydride grafted polyethylene, adding the mixture into a double-screw extruder after mixing, carrying out melt blending and granulation, wherein the temperature of an extruder cylinder is 190 ℃, and the temperature of a die is 250 ℃, so as to obtain outer-layer profile particles;
4) mixing the granular plastic, the plant straw powder, the rice hull powder, the AT-168, the maleic anhydride grafted polyethylene, the AMO-95, the silane coupling agent, the titanium-nickel yellow, the UVP-327 and the talcum powder in the step 2), adding the mixture into a double-screw extruder after mixing, carrying out melt blending and granulation, wherein the temperature of the extruder barrel is 200 ℃, and the temperature of a die is 240 ℃, so as to obtain outer-layer section particles;
5) sucking outer-layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the outer-layer profile particles by the extruder, then feeding the outer-layer profile particles into a wood-plastic co-extrusion die, controlling the temperature to be 190 ℃, hot-pressing the outer-layer profile particles onto the surface of a core material, and cooling; and sucking the particles of the outer-layer first profile into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the particles by the extruder, then feeding the particles into a wood-plastic co-extrusion die, controlling the temperature at 190 ℃, hot-pressing the particles to the two surfaces of the outer layer, and cooling to form the low-heat-absorption multi-layer co-extrusion wood-plastic profile.
Table 2 example 2 performance test results of wood plastic profile
Example 3
The low-heat-absorption multilayer co-extrusion wood-plastic profile comprises a core material, a first outer layer and a second outer layer, wherein the second outer layer is hot-pressed on the core material, the first outer layer is hot-pressed on the second outer layer, and the second outer layer comprises the following raw materials in parts by weight: 35 parts of high-density polyethylene, 15 parts of pine powder, 6 parts of superfine glass wool, 7 parts of high-silicon cotton, 4 parts of calcium carbonate, 2.5 parts of a silane coupling agent and 4 parts of maleic anhydride grafted polyethylene, wherein the outer layer I comprises the following raw materials in parts by weight: 18 parts of high-density polyethylene, 11 parts of plant straw powder and rice hull, AT-1681.5 parts, 2.5 parts of maleic anhydride grafted polyethylene, AMO-951.5 parts, 1.5 parts of silane coupling agent, 4 parts of ferrosilicon red, UVP-3271.5 parts and 1.5 parts of talcum powder.
A preparation method of a low-heat-absorption multilayer co-extrusion wood-plastic profile comprises the following specific steps:
1) soaking superfine glass wool and high-silicon cotton in a mixed solution of a coupling agent and maleic anhydride grafted polyethylene for 38min, heating at about 110 ℃ for 2.5h, and then cooling to room temperature to obtain a treated low-heat-absorption raw material;
2) putting the high-density polyethylene into a granulator for extrusion granulation to form granular plastic, and crushing pine, plant straws and rice hulls into powder of 80-100 meshes;
3) mixing the low-heat-absorption raw material treated in the step 1), the granular plastic in the step 2), pine wood powder, calcium carbonate and maleic anhydride grafted polyethylene, adding the mixture into a double-screw extruder after mixing, carrying out melt blending and granulation, wherein the temperature of an extruder cylinder is 170 ℃, and the temperature of a die is 210 ℃, so as to obtain outer-layer profile particles;
4) mixing the granular plastic, the plant fiber second powder, AT-168, maleic anhydride grafted polyethylene, AMO-95, a silane coupling agent, ferrosilicon red, UVP-327 and talcum powder in the step 2), adding the mixture into a double-screw extruder to perform melt blending and granulation, wherein the temperature of the extruder cylinder is 180 ℃, and the temperature of a die is 210 ℃ to obtain outer-layer first section particles;
5) sucking outer-layer profile material particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the profile material particles by the extruder, then feeding the profile material particles into a wood-plastic co-extrusion die, controlling the temperature at 180 ℃, hot-pressing the profile material particles onto the surface of a core material, and cooling; and sucking the particles of the outer-layer first profile into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the particles by the extruder, then feeding the particles into a wood-plastic co-extrusion die, controlling the temperature at 180 ℃, hot-pressing the particles to the two surfaces of the outer layer, and cooling to form the low-heat-absorption multi-layer co-extrusion wood-plastic profile.
Table 3 results of performance test of wood plastic profile of example 3
Example 4
The low-heat-absorption multilayer co-extrusion wood-plastic profile comprises a core material, a first outer layer and a second outer layer, wherein the second outer layer is hot-pressed on the core material, the first outer layer is hot-pressed on the second outer layer, and the second outer layer comprises the following raw materials in parts by weight: 30 parts of high-density polyethylene, 6 parts of poplar powder, 6 parts of birch powder, 6 parts of pine powder, 5 parts of superfine glass wool, 8 parts of high-silicon cotton, 3 parts of calcium carbonate, 3 parts of a silane coupling agent and 5 parts of maleic anhydride grafted polyethylene, wherein the first outer layer comprises the following raw materials in parts by weight: 15 parts of high-density polyethylene, 15 parts of plant straw powder and rice hull, AT-1682 parts of maleic anhydride grafted polyethylene, AMO-952 parts of maleic anhydride, 2 parts of silane coupling agent, 2-6 parts of titanium cobalt green, UVP-3272 parts of talcum powder and 1 part of talcum powder.
A preparation method of a low-heat-absorption multilayer co-extrusion wood-plastic profile comprises the following specific steps:
1) soaking superfine glass wool and high-silicon cotton in a mixed solution of a coupling agent and maleic anhydride grafted polyethylene for 42min, heating at about 110 ℃ for 2.5h, and then cooling to room temperature to obtain a treated low-heat-absorption raw material;
2) putting the high-density polyethylene into a granulator for extrusion granulation to form granular plastic, and crushing poplar, birch, pine, plant straw and rice hull into powder of 80-100 meshes;
3) mixing the low-heat-absorption raw material treated in the step 1) and the granular plastic in the step 2) with poplar powder, birch powder, pine wood, calcium carbonate and maleic anhydride grafted polyethylene, adding the mixture into a double-screw extruder to perform melt blending and granulation, wherein the temperature of an extruder cylinder is 180 ℃, and the temperature of a die is 190 ℃ to obtain outer-layer profile particles;
4) mixing the granular plastic, the plant straw powder, the rice hull powder, the AT-168, the maleic anhydride grafted polyethylene, the AMO-95, the silane coupling agent, the titanium cobalt green, the UVP-327 and the talcum powder in the step 2), adding the mixture into a double-screw extruder to perform melt blending and granulation, wherein the temperature of the extruder barrel is 190 ℃, and the temperature of a die is 220 ℃, so as to obtain outer-layer section particles;
5) sucking outer-layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the outer-layer profile particles by the extruder, then feeding the outer-layer profile particles into a wood-plastic co-extrusion die, controlling the temperature at 175 ℃, hot-pressing the outer-layer profile particles onto the surface of a core material, and cooling; and sucking the particles of the outer-layer first profile into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the particles by the extruder, then feeding the particles into a wood-plastic co-extrusion die, controlling the temperature at 185 ℃, hot-pressing the particles onto the surface of the outer layer two, and cooling to form the low-heat-absorption multi-layer co-extrusion wood-plastic profile.
Table 4 example 4 performance test results of wood plastic profile
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
The present invention is not limited to the above description of the embodiments, and those skilled in the art should, in light of the present disclosure, appreciate that many changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (8)
1. A low heat absorption type multilayer co-extrusion wood-plastic profile is characterized in that: the core material comprises a core material, a first outer layer and a second outer layer, wherein the second outer layer is hot-pressed on the core material, the first outer layer is hot-pressed on the second outer layer, and the second outer layer comprises the following raw materials in parts by weight: 30-40 parts of high-density polyethylene, 10-20 parts of first plant fiber, 5-8 parts of superfine glass wool, 5-8 parts of high-silicon cotton, 3-5 parts of calcium carbonate, 2-3 parts of coupling agent and 3-5 parts of compatilizer, wherein the first outer layer comprises the following raw materials in parts by weight: 15-20 parts of high-density polyethylene, 8-15 parts of plant fiber II, 1-2 parts of antioxidant, 2-3 parts of compatilizer, 1-2 parts of stabilizer, 1-2 parts of coupling agent, 2-6 parts of infrared reflection pigment, 1-2 parts of anti-ultraviolet agent and 1-2 parts of talcum powder.
2. A low heat absorption type multilayer co-extruded wood plastic profile according to claim 1, wherein: the plant fiber I is one or more of poplar powder, birch powder and pine powder.
3. A low heat absorption type multilayer co-extruded wood plastic profile according to claim 1, wherein: the mixture of the plant fiber two-plant straw powder and the rice hull powder has a mass ratio of the straw powder to the rice hull powder of 2: 1.
4. a low heat absorption type multilayer co-extruded wood plastic profile according to claim 1, wherein: the compatilizer is maleic anhydride grafted polyethylene.
5. A low heat absorption type multilayer co-extruded wood plastic profile according to claim 1, wherein: the antioxidant is AT-168, the ultraviolet resistant agent is UVP-327, and the stabilizer is AMO-95.
6. A low heat absorption type multilayer co-extruded wood plastic profile according to claim 1, wherein: the coupling agent is a silane coupling agent.
7. A low heat absorption type multilayer co-extruded wood plastic profile according to claim 1, wherein: the infrared reflection pigment is one of titanium dioxide, titanium-nickel yellow, ferrosilicon red and titanium-cobalt green.
8. The method for preparing the low heat absorption type multilayer co-extrusion wood plastic profile according to claim 1, wherein the method comprises the following steps: the method comprises the following specific steps:
1) soaking superfine glass wool and high-silicon cotton in a mixed solution of a coupling agent and maleic anhydride grafted polyethylene for 30-45min, heating for 2-3h at about 110 ℃, and then cooling to room temperature to obtain a treated low-heat-absorption raw material;
2) putting the high-density polyethylene into a granulator for extrusion granulation to form granular plastic, and crushing the plant fiber I and the plant fiber II into powder of 80-100 meshes;
3) mixing the low-heat-absorption raw material treated in the step 1), the particle plastic and the plant fiber powder in the step 2), calcium carbonate and maleic anhydride grafted polyethylene, adding the mixture into a double-screw extruder for melt blending and granulation, wherein the temperature of the extruder barrel is 190 ℃ at 150-;
4) mixing the granular plastic, the plant fiber second powder, the antioxidant, the maleic anhydride grafted polyethylene, the stabilizer, the coupling agent, the infrared reflection pigment, the ultraviolet resistant agent and the talcum powder in the step 2), adding the mixture into a double-screw extruder after mixing, carrying out melt blending and granulation, wherein the temperature of an extruder barrel is 160-200 ℃ and the temperature of a die is 190-240 ℃ to obtain outer-layer first section particles;
5) sucking outer-layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the outer-layer profile particles by the extruder, then feeding the outer-layer profile particles into a wood-plastic co-extrusion die, controlling the temperature at 170 ℃ and 190 ℃, hot-pressing the outer-layer profile particles onto the surface of a core material, and cooling; and sucking the particles of the outer-layer profile into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the particles by the extruder, then feeding the particles into a wood-plastic co-extrusion die, controlling the temperature at 170-190 ℃, hot-pressing the particles onto the surface of the outer layer, and cooling to form the low-heat-absorption multi-layer co-extrusion wood-plastic profile.
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