CN110682636B - Elastic surface co-extrusion wood-plastic profile and preparation method thereof - Google Patents

Elastic surface co-extrusion wood-plastic profile and preparation method thereof Download PDF

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CN110682636B
CN110682636B CN201910932316.7A CN201910932316A CN110682636B CN 110682636 B CN110682636 B CN 110682636B CN 201910932316 A CN201910932316 A CN 201910932316A CN 110682636 B CN110682636 B CN 110682636B
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parts
elastic
particles
extruder
elastic surface
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CN110682636A (en
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方晓钟
肖磊
王潇翔
丁浩
李永乐
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Anhui Guofeng Wood Plastic Technology Co Ltd
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Anhui Guofeng Wood Plastic Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/12—Layered products comprising a layer of natural or synthetic rubber comprising natural rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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    • 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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
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Abstract

The invention discloses an elastic surface co-extrusion wood-plastic profile which comprises a core material layer, an elastic inner layer and an elastic surface layer, wherein the elastic inner layer comprises the following raw materials in parts by weight: 20-30 parts of natural rubber, 15-20 parts of polypropylene oxide polyether polyol, 15-20 parts of high-density polyethylene, 20-25 parts of poplar powder, 3-8 parts of coupling agent, 2-5 parts of compatilizer, 3-5 parts of plasticizer and 5-8 parts of calcium carbonate, wherein the elastic surface layer comprises the following raw materials in parts by weight: 20-30 parts of high-density polyethylene, 20-25 parts of poplar powder, 10-15 parts of elastic material, 3-6 parts of compatilizer, 3-5 parts of coupling agent, 2-3 parts of antioxidant, 1-2 parts of anti-ultraviolet agent and 2-4 parts of calcium carbonate. The design of the double-layer elastic layer of the co-extruded wood-plastic profile ensures that the co-extruded wood-plastic profile has high resilience, wear resistance and oxidation resistance, and the service life is obviously prolonged.

Description

Elastic surface co-extrusion wood-plastic profile and preparation method thereof
Technical Field
The invention belongs to the technical field of wood-plastic profile materials and processing, and particularly relates to an elastic surface co-extrusion wood-plastic profile and a preparation method thereof.
Background
Currently, in the field of decoration, the indoor floor paving material is generally various wood floors or composite wood floors. The wooden floor has comfortable foot feeling, but has the problems of expansion deformation, warping cracking and the like when in use. The wood-plastic floor is a novel environment-friendly wood-plastic composite product, is mainly formed by compounding wood powder plant fibers, thermoplastic high polymer materials, processing aids and the like, is a high-tech green environment-friendly material which is prepared by uniformly mixing and then heating and extruding through die equipment, has the performance and characteristics of wood and plastic, and can replace novel environment-friendly high-tech materials of wood and plastic. With the development of times, the demand of special floors, such as basketball court floors, is increasing. Basketball court floors are required to have good anti-skid performance and buffering performance, and the existing wood-plastic floors are poor in elastic performance and adhesion performance and easy to age, crack and wear. If the surface is too soft, although the surface has good rebound resilience, the hardness often does not meet the actual requirement, and the phenomena of poor foot feel, easy abrasion, easy aging and the like can be caused.
Disclosure of Invention
The invention aims to solve the problems and provides an elastic surface co-extruded wood-plastic profile and a preparation method thereof.
The invention provides an elastic surface co-extrusion wood-plastic profile which comprises a core material layer, an elastic inner layer and an elastic surface layer, wherein the elastic inner layer comprises the following raw materials in parts by weight: 20-30 parts of natural rubber, 15-20 parts of polypropylene oxide polyether polyol, 15-20 parts of high-density polyethylene, 20-25 parts of poplar powder, 3-8 parts of coupling agent, 2-5 parts of compatilizer, 3-5 parts of plasticizer and 5-8 parts of calcium carbonate, wherein the elastic surface layer comprises the following raw materials in parts by weight: 20-30 parts of high-density polyethylene, 20-25 parts of poplar powder, 10-15 parts of elastic material, 3-6 parts of compatilizer, 3-5 parts of coupling agent, 2-3 parts of antioxidant, 1-2 parts of anti-ultraviolet agent and 2-4 parts of calcium carbonate. The thickness of the elastic skin layer is about 1/2 a of the elastic inner layer.
Preferably, the polypropylene oxide ether polyol is two or more of PPG400, PPG500 and PPG 450.
PPG400 number average molecular weight 400, polypropylene oxide ether triol, PPG500 number average molecular weight 500, polypropylene oxide ether triol, PPG450 number average molecular weight 450, polypropylene oxide ether tetraol.
As a further preferable means, the coupling agent is a silane coupling agent.
As a further preferable means, the elastic material is one or more of SEBS, TPE, TPV, TPU. SEBS is hydrogenated styrene-butadiene block copolymer, TPE is butadiene or isoprene and styrene block copolymer, TPV is thermoplastic ethylene propylene diene dynamic vulcanization elastomer, and TPU is thermoplastic polyurethane elastomer rubber.
As a further preferred means, the compatibilizer is maleic anhydride grafted polyethylene.
As a further preferred means, the plasticizer is one or both of dioctyl phthalate or dioctyl terephthalate.
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.
A preparation method of an elastic surface co-extrusion wood-plastic section comprises the following specific steps:
1) mixing and heating natural rubber and polypropylene oxide ether polyol for melting, then adding a plasticizer for modification, and then putting the mixture into an extruder for extrusion molding to form elastic particles;
2) soaking poplar powder in a solution of a coupling agent and a compatilizer to obtain modified poplar powder;
3) mixing modified poplar powder prepared according to the proportion of the elastic inner layer with high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form inner-layer plastic particles;
4) mixing modified poplar powder prepared according to the proportion of the elastic surface layer and high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form surface layer plastic particles;
5) mixing the elastic particles obtained in the step 1), the inner layer plastic particles obtained in the step 3) and calcium carbonate, adding the mixture into a double-screw extruder for melt blending and granulation, wherein the temperature of the extruder barrel is 190 ℃ and the temperature of a die is 250 ℃ to obtain elastic inner layer section particles;
6) mixing the surface plastic particles, the elastic material, the antioxidant, the anti-ultraviolet agent and the calcium carbonate in the step 4), adding the mixture into a double-screw extruder for melt blending and granulation, wherein the temperature of an extruder barrel is 190 ℃ plus one year, and the temperature of a die is 250 ℃ plus one year, so as to obtain elastic surface section particles;
7) sucking elastic inner layer section bar particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic inner layer section bar particles by the extruder, then feeding the elastic inner layer section bar particles into a wood-plastic co-extrusion die, controlling the temperature at 170-190 ℃, hot-pressing the elastic inner layer section bar particles to the surface of the core material layer, and cooling; sucking the elastic surface layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic surface layer profile particles by the extruder, then feeding the elastic surface layer profile particles into a wood-plastic co-extrusion die, controlling the temperature at 170-190 ℃, hot-pressing the elastic surface layer profile particles to the surface of the elastic inner layer, and cooling to form the elastic surface co-extruded wood-plastic profile.
The invention has the beneficial effects that: 1. the two outer layers are hot-pressed outside the core material layer, the elastic inner layer is relatively soft and high in elasticity, the hardness of the elastic surface layer is higher than that of the elastic inner layer, but the elastic surface layer is softer than that of the core material layer and has better wear resistance, the elastic inner layer ensures the overall high elasticity of the co-extruded wood-plastic section, and the elastic surface layer is damaged by strong impact on the core material to play a role in buffering. 2. The natural rubber has good rebound resilience and strong buffering capacity, and is not easy to deform after being formed into rubber, and the polypropylene oxide ether polyol has good elastic property, so that the elastic inner layer has high elasticity, and is not easy to oxidize due to being protected by the outer layer, high in thermal stability and more environment-friendly; a certain amount of elastic material has been added on the elasticity top layer for the top layer has certain resilience, and the resilience performance reaches the user demand, and high density polyethylene content will be higher than the elasticity inlayer, guarantees its wearability, adds antioxidant and ultraviolet resistance agent simultaneously, guarantees the antioxidant capacity on top layer and prevents ultraviolet damage.
Detailed Description
The invention is described in further detail below:
example 1
The elastic surface co-extrusion wood-plastic section comprises a core material layer, an elastic inner layer and an elastic surface layer, wherein the elastic inner layer comprises the following raw materials in parts by weight: 30 parts of natural rubber, 20 parts of polypropylene oxide ether polyol, 20 parts of high-density polyethylene, 25 parts of poplar powder, 8 parts of silane coupling agent, 5 parts of maleic anhydride grafted polyethylene, 5 parts of dioctyl phthalate and 8 parts of calcium carbonate, wherein the elastic surface layer comprises the following raw materials in parts by weight: 30 parts of high-density polyethylene, 25 parts of poplar powder, 15 parts of elastic material, 6 parts of maleic anhydride grafted polyethylene, 5 parts of silane coupling agent, AT-1683 parts, UVP-3272 parts and 4 parts of calcium carbonate.
The polypropylene oxide ether polyols are PPG400 and PPG 500. The elastic material is SEBS and TPE.
A preparation method of an elastic surface co-extrusion wood-plastic section comprises the following specific steps:
1) mixing and heating natural rubber and polypropylene oxide ether polyol for melting, then adding dioctyl phthalate for modification, and then putting the mixture into an extruder for extrusion molding to form elastic particles;
2) soaking poplar powder in a solution of a silane coupling agent and maleic anhydride grafted polyethylene to obtain modified poplar powder;
3) mixing modified poplar powder prepared according to the proportion of the elastic inner layer with high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form inner-layer plastic particles;
4) mixing modified poplar powder prepared according to the proportion of the elastic surface layer and high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form surface layer plastic particles;
5) mixing the elastic particles obtained in the step 1), the inner layer plastic particles obtained in the step 3) and calcium carbonate, adding the mixture into a double-screw extruder to perform 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 elastic inner layer profile particles;
6) mixing the surface plastic particles, the elastic material, AT-168, UVP-327 and calcium carbonate in the step 4), adding the mixture into a double-screw extruder to perform melt blending and granulation, wherein the temperature of an extruder cylinder is 150 ℃, and the temperature of a die is 180 ℃ to obtain elastic surface section particles;
7) sucking elastic inner layer section bar particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic inner layer section bar particles by the extruder, then feeding the elastic inner layer section bar particles into a wood-plastic co-extrusion die, controlling the temperature at 170 ℃, hot-pressing the elastic inner layer section bar particles to the surface of a core material layer, and cooling; and sucking the elastic surface layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic surface layer profile particles by the extruder, then feeding the elastic surface layer profile particles into a wood-plastic co-extrusion die, controlling the temperature at 170 ℃, hot-pressing the elastic surface layer profile particles to the surface of an elastic inner layer, and cooling to form the elastic surface co-extrusion wood-plastic profile.
Example 2
The elastic surface co-extrusion wood-plastic section comprises a core material layer, an elastic inner layer and an elastic surface layer, wherein the elastic inner layer comprises the following raw materials in parts by weight: 20 parts of natural rubber, 15 parts of polypropylene oxide ether polyol, 15 parts of high-density polyethylene, 20 parts of poplar powder, 3 parts of a silane coupling agent, 2 parts of maleic anhydride grafted polyethylene, 3 parts of dioctyl terephthalate and 5 parts of calcium carbonate, wherein the elastic surface layer comprises the following raw materials in parts by weight: 20 parts of high-density polyethylene, 20 parts of poplar powder, 10 parts of elastic material, 3 parts of maleic anhydride grafted polyethylene, 3 parts of silane coupling agent, AT-1682 parts, UVP-3271 parts and 2 parts of calcium carbonate.
The polypropylene oxide ether polyols are PPG500 and PPG 450. The elastic material is TPV and TPU.
A preparation method of an elastic surface co-extrusion wood-plastic section comprises the following specific steps:
1) mixing and heating natural rubber and polypropylene oxide ether polyol for melting, adding dioctyl terephthalate for modification, and then putting into an extruder for extrusion molding to form elastic particles;
2) soaking poplar powder in a solution of a silane coupling agent and maleic anhydride grafted polyethylene to obtain modified poplar powder;
3) mixing modified poplar powder prepared according to the proportion of the elastic inner layer with high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form inner-layer plastic particles;
4) mixing modified poplar powder prepared according to the proportion of the elastic surface layer and high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form surface layer plastic particles;
5) mixing the elastic particles obtained in the step 1), the inner layer plastic particles obtained in the step 3) and calcium carbonate, adding the mixture into a double-screw extruder to perform melt blending and granulation, wherein the temperature of the extruder barrel is 150-;
6) mixing the surface plastic particles, the elastic material, AT-168, UVP-327 and calcium carbonate in the step 4), adding the mixture into a double-screw extruder to perform melt blending and granulation, wherein the temperature of an extruder cylinder is 190 ℃, and the temperature of a die is 250 ℃ to obtain elastic surface section particles;
7) sucking elastic inner layer section bar particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic inner layer section bar particles by the extruder, then feeding the elastic inner layer section bar particles into a wood-plastic co-extrusion die, controlling the temperature to be 190 ℃, hot-pressing the elastic inner layer section bar particles onto the surface of a core material layer, and cooling; and sucking the elastic surface layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic surface layer profile particles by the extruder, then feeding the elastic surface layer profile particles into a wood-plastic co-extrusion die, controlling the temperature at 190 ℃, hot-pressing the elastic surface layer profile particles to the surface of an elastic inner layer, and cooling to form the elastic surface co-extrusion wood-plastic profile.
Example 3
The elastic surface co-extrusion wood-plastic section comprises a core material layer, an elastic inner layer and an elastic surface layer, wherein the elastic inner layer comprises the following raw materials in parts by weight: 25 parts of natural rubber, 18 parts of polypropylene oxide ether polyol, 18 parts of high-density polyethylene, 22 parts of poplar powder, 5 parts of a silane coupling agent, 4 parts of maleic anhydride grafted polyethylene, 4 parts of dioctyl phthalate and dioctyl terephthalate and 7 parts of calcium carbonate, wherein the elastic surface layer comprises the following raw materials in parts by weight: 25 parts of high-density polyethylene, 22 parts of poplar powder, 12 parts of elastic material, 4 parts of maleic anhydride grafted polyethylene, 4 parts of silane coupling agent, AT-1682.5 parts, UVP-3271.5 parts and 3 parts of calcium carbonate.
The polypropylene oxide ether polyols are PPG400, PPG500 and PPG 450.
The elastic material is TPE and TPV.
A preparation method of an elastic surface co-extrusion wood-plastic section comprises the following specific steps:
1) mixing and heating natural rubber and polypropylene oxide ether polyol for melting, then adding dioctyl phthalate and dioctyl terephthalate for modification, and then putting into an extruder for extrusion molding to form elastic particles;
2) soaking poplar powder in a solution of a coupling agent and a compatilizer to obtain modified poplar powder;
3) mixing modified poplar powder prepared according to the proportion of the elastic inner layer with high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form inner-layer plastic particles;
4) mixing modified poplar powder prepared according to the proportion of the elastic surface layer and high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form surface layer plastic particles;
5) mixing the elastic particles obtained in the step 1), the inner layer plastic particles obtained in the step 3) and calcium carbonate, adding the mixture into a double-screw extruder to perform melt blending and granulation, wherein the temperature of an extruder cylinder is 170 ℃, and the temperature of a die is 210 ℃ to obtain elastic inner layer profile particles;
6) mixing the surface plastic particles, the elastic material, AT-168, UVP-327 and calcium carbonate in the step 4), adding the mixture into a double-screw extruder to perform melt blending and granulation, wherein the temperature of an extruder cylinder is 170 ℃, and the temperature of a die is 210 ℃ to obtain elastic surface section particles;
7) sucking elastic inner layer section bar particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic inner layer section bar particles by the extruder, then feeding the elastic inner layer section bar particles into a wood-plastic co-extrusion die, controlling the temperature at 180 ℃, hot-pressing the elastic inner layer section bar particles to the surface of a core material layer, and cooling; and sucking the elastic surface layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic surface layer profile particles by the extruder, then feeding the elastic surface layer profile particles into a wood-plastic co-extrusion die, controlling the temperature at 180 ℃, hot-pressing the elastic surface layer profile particles to the surface of an elastic inner layer, and cooling to form the elastic surface co-extrusion wood-plastic profile.
Example 4
The elastic surface co-extrusion wood-plastic section comprises a core material layer, an elastic inner layer and an elastic surface layer, wherein the elastic inner layer comprises the following raw materials in parts by weight: 30 parts of natural rubber, 15 parts of polypropylene oxide ether polyol, 15 parts of high-density polyethylene, 25 parts of poplar powder, 8 parts of silane coupling agent, 5 parts of maleic anhydride grafted polyethylene, 3 parts of dioctyl phthalate and 5 parts of calcium carbonate, wherein the elastic surface layer comprises the following raw materials in parts by weight: 30 parts of high-density polyethylene, 20 parts of poplar powder, 15 parts of elastic material, 6 parts of maleic anhydride grafted polyethylene, 3 parts of silane coupling agent, AT-1682 parts, UVP-3272 parts and 4 parts of calcium carbonate.
The polypropylene oxide ether polyols are PPG400 and PPG 450.
The elastic material is SEBS, TPE, TPV and TPU.
A preparation method of an elastic surface co-extrusion wood-plastic section comprises the following specific steps:
1) mixing and heating natural rubber and polypropylene oxide ether polyol for melting, then adding dioctyl phthalate for modification, and then putting the mixture into an extruder for extrusion molding to form elastic particles;
2) soaking poplar powder in a solution of a silane coupling agent and maleic anhydride grafted polyethylene to obtain modified poplar powder;
3) mixing modified poplar powder prepared according to the proportion of the elastic inner layer with high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form inner-layer plastic particles;
4) mixing modified poplar powder prepared according to the proportion of the elastic surface layer and high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form surface layer plastic particles;
5) mixing the elastic particles obtained in the step 1), the inner layer plastic particles obtained in the step 3) and calcium carbonate, 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 230 ℃ to obtain elastic inner layer section particles;
6) mixing the surface plastic particles, the elastic material, AT-168, UVP-327 and calcium carbonate in the step 4), 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 elastic surface section particles;
7) sucking elastic inner layer section bar particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic inner layer section bar particles by the extruder, then feeding the elastic inner layer section bar particles into a wood-plastic co-extrusion die, controlling the temperature at 175 ℃, hot-pressing the elastic inner layer section bar particles to the surface of a core material layer, and cooling; sucking the elastic surface layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic surface layer profile particles by the extruder, then feeding the elastic surface layer profile particles into a wood-plastic co-extrusion die, controlling the temperature at 185 ℃, hot-pressing the elastic surface layer profile particles to the surface of an elastic inner layer, and cooling to form the elastic surface co-extrusion 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. An elastic surface co-extrusion wood-plastic section is characterized in that: the elastic core comprises a core material layer, an elastic inner layer and an elastic surface layer, wherein the elastic inner layer comprises the following raw materials in parts by weight: 20-30 parts of natural rubber, 15-20 parts of polypropylene oxide polyether polyol, 15-20 parts of high-density polyethylene, 20-25 parts of poplar powder, 3-8 parts of coupling agent, 2-5 parts of compatilizer, 3-5 parts of plasticizer and 5-8 parts of calcium carbonate, wherein the elastic surface layer comprises the following raw materials in parts by weight: 20-30 parts of high-density polyethylene, 20-25 parts of poplar powder, 10-15 parts of elastic material, 3-6 parts of compatilizer, 3-5 parts of coupling agent, 2-3 parts of antioxidant, 1-2 parts of anti-ultraviolet agent and 2-4 parts of calcium carbonate.
2. An elastic surface co-extruded wood plastic profile according to claim 1, wherein: the polypropylene oxide ether polyol is more than two of PPG400, PPG500 and PPG 450.
3. An elastic surface co-extruded wood plastic profile according to claim 1, wherein: the coupling agent is a silane coupling agent.
4. An elastic surface co-extruded wood plastic profile according to claim 1, wherein: the elastic material is one or more of SEBS, TPE, TPV and TPU.
5. An elastic surface co-extruded wood plastic profile according to claim 1, wherein: the compatilizer is maleic anhydride grafted polyethylene.
6. An elastic surface co-extruded wood plastic profile according to claim 1, wherein: the plasticizer is dioctyl phthalate or dioctyl terephthalate.
7. An elastic surface co-extruded wood plastic profile according to claim 1, wherein: the antioxidant is AT-168, and the ultraviolet resistant agent is UVP-327.
8. A preparation method of an elastic surface co-extrusion wood-plastic profile is characterized by comprising the following steps: the method comprises the following specific steps:
1) mixing and heating natural rubber and polypropylene oxide ether polyol for melting, then adding a plasticizer for modification, and then putting the mixture into an extruder for extrusion molding to form elastic particles;
2) soaking poplar powder in a solution of a coupling agent and a compatilizer to obtain modified poplar powder;
3) mixing modified poplar powder prepared according to the proportion of the elastic inner layer with high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form inner-layer plastic particles;
4) mixing modified poplar powder prepared according to the proportion of the elastic surface layer and high-density polyethylene in a corresponding proportion, adding the mixture into an extruder, and extruding to form surface layer plastic particles;
5) mixing the elastic particles obtained in the step 1), the inner layer plastic particles obtained in the step 3) and calcium carbonate, adding the mixture into a double-screw extruder for melt blending and granulation, wherein the temperature of the extruder barrel is 190 ℃ and the temperature of a die is 250 ℃ to obtain elastic inner layer section particles;
6) mixing the surface plastic particles, the elastic material, the antioxidant, the anti-ultraviolet agent and the calcium carbonate in the step 4), adding the mixture into a double-screw extruder for melt blending and granulation, wherein the temperature of an extruder barrel is 190 ℃ plus one year, and the temperature of a die is 250 ℃ plus one year, so as to obtain elastic surface section particles;
7) sucking elastic inner layer section bar particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic inner layer section bar particles by the extruder, then feeding the elastic inner layer section bar particles into a wood-plastic co-extrusion die, controlling the temperature at 170-190 ℃, hot-pressing the elastic inner layer section bar particles to the surface of the core material layer, and cooling; sucking the elastic surface layer profile particles into a feeding hopper of a single-screw co-extruder through a negative pressure fan, melting the elastic surface layer profile particles by the extruder, then feeding the elastic surface layer profile particles into a wood-plastic co-extrusion die, controlling the temperature at 170-190 ℃, hot-pressing the elastic surface layer profile particles to the surface of the elastic inner layer, and cooling to form the elastic surface co-extruded wood-plastic profile.
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