CN111057386A - Nano wood-plastic co-extrusion composite material and preparation method thereof - Google Patents
Nano wood-plastic co-extrusion composite material and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
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Abstract
The invention discloses a nano wood-plastic co-extrusion composite material and a preparation method thereof. The nano wood-plastic co-extrusion composite material consists of a core layer and a functional surface layer for coating the core layer, wherein the core layer comprises plant fibers, PE plastics, a compatilizer, an antioxidant, a lubricant and talcum powder, and the functional surface layer comprises PE plastics, modified polypropylene fibers, an ethylene-methacrylic acid copolymer, an interface modifier, nano inorganic particles, a light stabilizer, an antioxidant and other auxiliaries. The preparation method of the nano wood-plastic co-extrusion composite material is very simple, and the core layer particle material and the functional surface layer particle material are prepared respectively and then co-extruded to form the nano wood-plastic co-extrusion composite material. The nano wood-plastic co-extrusion composite material disclosed by the invention is high in strength, excellent in impact resistance, large in hardness, good in wear resistance, low in water absorption, good in aging resistance, good in wear resistance and scratch resistance, strong in wood texture, excellent in anti-skid effect and not easy to fade and mildew when used outdoors.
Description
Technical Field
The invention relates to a nano wood-plastic co-extrusion composite material and a preparation method thereof, belonging to the technical field of wood-plastic composite materials.
Background
The wood-plastic composite material is a novel composite material prepared by mixing plastics such as polyethylene, polypropylene, polyvinyl chloride and the like with plant fibers such as wood flour, rice hulls, straws and the like. In recent years, the wood-plastic composite material is developed rapidly, is applied to the fields of packaging boxes, automotive upholsteries, outdoor planks, fences, furniture, doors and windows and the like, and can almost cover the fields of all logs, plastics, plastic steel, aluminum alloy and other similar composite materials which are used at present. Meanwhile, the wood-plastic composite material has natural resources and environmental protection advantages, meets the requirements of sustainable development, circular economy and low-carbon economy, and becomes a green environment-friendly energy-saving material which is supported by various levels of governments to develop and advocate application at present. The wood-plastic composite material has the advantages of diversified raw materials, plastifiable preparation, environmental protection of products, economic application, low carbonization of regeneration and is expected to replace natural wood.
However, the existing wood-plastic composite material generally has the defects of poor ageing resistance, low hardness, high water absorption rate relative to plastic products, easy mildew and fading in a humid environment and the like, and further popularization and application of the wood-plastic composite material are limited.
Therefore, technical upgrading is necessary to improve the performance of the wood-plastic composite material and overcome the defects of the existing wood-plastic composite material.
Disclosure of Invention
The invention aims to provide a nano wood-plastic co-extrusion composite material and a preparation method thereof, which overcome the defects of easy fading and easy mildewing of the existing wood-plastic composite material when applied, improve the weather resistance of the wood-plastic composite material when used in an outdoor environment and expand the application range of the wood-plastic composite material.
The technical scheme adopted by the invention is as follows:
the nano wood-plastic co-extrusion composite material consists of a core layer and a functional surface layer for coating the core layer, wherein the core layer comprises the following components in percentage by mass:
plant fiber: 35% -70%;
PE plastic: 20 to 40 percent;
a compatilizer: 0.5 to 5 percent;
antioxidant: 0.1 to 0.5 percent;
lubricant: 1% -4%;
talc powder: 5% -20%;
the functional surface layer comprises the following components in percentage by mass:
PE plastic: 15% -40%;
modified polypropylene fiber: 5% -15%;
ethylene-methacrylic acid copolymer: 15% -40%;
an interface modifier: 5% -15%;
nano inorganic particles: 1% -5%;
light stabilizer: 0.2% -1%;
antioxidant: 0.1 to 0.5 percent;
other auxiliary agents: 1 to 10 percent.
Preferably, the nano wood-plastic co-extrusion composite material consists of a core layer and a functional surface layer for coating the core layer, wherein the core layer comprises the following components in percentage by mass:
plant fiber: 45 to 65 percent;
PE plastic: 25 to 35 percent;
a compatilizer: 2% -5%;
antioxidant: 0.1 to 0.5 percent;
lubricant: 1% -4%;
talc powder: 5% -15%;
the functional surface layer comprises the following components in percentage by mass:
PE plastic: 20 to 30 percent;
modified polypropylene fiber: 10% -15%;
ethylene-methacrylic acid copolymer: 30% -40%;
an interface modifier: 10% -15%;
nano inorganic particles: 1% -5%;
light stabilizer: 0.3 to 0.7 percent;
antioxidant: 0.3 to 0.5 percent;
other auxiliary agents: 5 to 10 percent.
Preferably, the thickness of the core layer is 5-150 mm, and the thickness of the functional surface layer is 0.5-2 mm.
Preferably, the width of the core layer is 10-350 mm.
Preferably, the plant fiber is at least one of wood flour, bamboo powder, straw powder, rice hull powder, peanut hull powder, coconut hull powder and bagasse powder.
Further preferably, the plant fiber is wood flour.
Preferably, the compatilizer is at least one of ethylene-acrylic acid copolymer, maleic anhydride grafted paraffin and maleic anhydride grafted ethylene-vinyl acetate copolymer.
Further preferably, the compatibilizer is an ethylene-acrylic acid copolymer.
Preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 168 and antioxidant 264.
Preferably, the lubricant is at least one of ethylene bis stearamide, stearic acid and calcium stearate.
Preferably, the length-diameter ratio of the modified polypropylene fiber is more than or equal to 100.
Preferably, the interfacial modifier is at least one of ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, maleic anhydride grafted polyolefin elastomer and maleic anhydride grafted ethylene-vinyl acetate copolymer.
Further preferably, the interfacial modifier is an ethylene-acrylic acid copolymer.
Preferably, the nano inorganic particles are nano ZnO and nano TiO2Nano SiO2Nano Al2O3At least one of (1).
More preferably, the nano inorganic particles are nano ZnO with the particle size of 10-100 nm.
Preferably, the light stabilizer is at least one of 2-hydroxy-4-n-octoxybenzophenone, poly (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidineethanol) succinate and triazine-piperidine condensate.
Further preferably, the light stabilizer is light stabilizer 622.
Preferably, the other auxiliary agents comprise 1-4% of coupling agent, 0.5-2% of initiator, 0.5-2% of functional modifier and 0.5-2% of lubricant.
The preparation method of the nano wood-plastic co-extrusion composite material comprises the following steps:
1) preparing core layer granules: fully drying the plant fiber, adding the plant fiber, the PE plastic, the compatilizer, the antioxidant, the lubricant and the talcum powder into a high-speed mixer, carrying out high-speed blending, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulating, air-drying and cooling to obtain core layer granules;
2) preparing functional surface layer granules: pretreating nano inorganic particles by using a coupling agent, blending the pretreated nano inorganic particles and an interface modifier to enable the interface modifier to fully infiltrate the nano inorganic particles, adding the infiltrated nano inorganic particles, PE plastic, modified polypropylene fiber, ethylene-methacrylic acid copolymer, a light stabilizer, an antioxidant, an initiator, a functional modifier and a lubricant into a high-speed mixer for melt blending to enable incompatible nano inorganic particles, the PE plastic and the modified polypropylene fiber to be compounded together through a double percolation effect, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulation, cooling and air drying to obtain a functional surface layer granule;
3) co-extrusion molding: add toper double screw extruder with sandwich layer granule material, through the transport of toper double screw, the heating, it extrudes to cut and smelt makes sandwich layer granule material get into the inside passage of crowded mould altogether and forms the sandwich layer, simultaneously with the single screw extruder of functional surface course granule material addition, through the transport of single screw, the heating, the compression, the friction is extruded with smelting and is made the outside passageway that functional surface course granule material got into crowded mould altogether cladding sandwich layer all-round, the reshaping, the knurling, the cooling and the cutting, obtain nanometer wood and mould crowded combined material altogether.
The invention has the beneficial effects that: the nano wood-plastic co-extrusion composite material disclosed by the invention is high in strength, excellent in impact resistance, large in hardness, good in wear resistance, low in water absorption, good in aging resistance, good in wear resistance and scratch resistance, strong in wood texture, excellent in anti-skid effect and not easy to fade and mildew when used outdoors.
1) The invention compounds incompatible nano inorganic particles, PE plastic and modified polypropylene fiber together through double percolation effect, two components capable of generating percolation exist in the process of filling polymer composite material with grafting modified nano inorganic particles, namely nano particle aggregate (grafting modified nano inorganic particle composite particles consisting of nano inorganic particles, grafting polymer and homopolymer) can form percolation structure, and the aggregate can form percolation in PE plastic matrix, grafting monomer in high molecular compatilizer is polymerized and grafted to the surface of nano inorganic particle, so that nano particle aggregate is supported, the surface energy of nano inorganic particle is greatly reduced, good dispersion of nano inorganic particle in prepared wood-plastic co-extrusion composite material is ensured, double percolation in dispersed phase and matrix continuous phase can make nano inorganic particle aggregate capable of bearing load and transferring stress, promoting the matrix around the nano inorganic particles to generate strong plastic shear yield, absorbing a large amount of energy, and finally obtaining the novel environment-friendly high-performance wood-plastic composite material with high modulus, high strength, good water resistance and good weather resistance;
2) the light stabilizer selected by the invention is suitable for use in a weakly acidic formula system, and can exert the ultraviolet resistance to the maximum extent;
3) the nano wood-plastic co-extrusion composite material has a composite structure consisting of a core layer and a functional surface layer, wherein the core layer is used for providing structural strength, only basic raw materials such as plant fibers, PE (polyethylene) plastics and talcum powder need to be added, and the functional surface layer is used for providing various performances such as wear resistance, impact strength, waterproof performance and ageing resistance;
4) the functional surface layer of the nano wood-plastic co-extrusion composite material is added with the modified polypropylene fiber, the nano inorganic particles, the interface modifier, the coupling agent, the initiator and the functional modifier, and in the extrusion granulation process, the surface modification grafting of the modified polypropylene fiber and the nano inorganic particles can be synchronously realized, the modification effect is obvious, and finally the comprehensive performance of the wood-plastic composite material can be obviously improved;
5) the functional surface layer of the nano wood-plastic co-extrusion composite material is added with the nano inorganic particles, so that the wood-plastic composite material not only has wood texture, but also can improve the anti-skid effect of the wood-plastic composite material;
6) the nano wood-plastic co-extrusion composite material is formed by co-extrusion, the core layer and the functional surface layer are crosslinked at the interface, and finally the core layer and the functional surface layer are combined very tightly;
7) the nano wood-plastic co-extrusion composite material has the advantages of environment-friendly raw materials, low formaldehyde release amount and good processing performance, and can improve the technical level of industry and the product grade to reach the domestic advanced level;
8) the preparation process of the nano wood-plastic co-extrusion composite material is simple, and compared with the traditional multi-step molding composite process, the preparation process has the advantages of low energy consumption, small occupied area of equipment, low investment and the like.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
the nano wood-plastic co-extrusion composite material consists of a core layer and a functional surface layer for coating the core layer, wherein the core layer and the functional surface layer consist of the following components:
TABLE 1 composition table of core layer and functional surface layer of nano wood-plastic co-extruded composite material
The preparation method of the nano wood-plastic co-extrusion composite material comprises the following steps:
1) preparing core layer granules: fully drying wood powder, adding the wood powder, PE plastic, ethylene-acrylic acid copolymer, antioxidant 1010, ethylene bis stearamide and talcum powder into a high-speed mixer, carrying out high-speed blending, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulating, air-drying and cooling to obtain core layer granules;
2) preparing functional surface layer granules: pretreating nano ZnO by using a coupling agent, blending the pretreated nano ZnO and an ethylene-acrylic acid copolymer to enable the ethylene-acrylic acid copolymer to fully infiltrate the nano ZnO, adding the infiltrated nano ZnO, PE plastic, modified polypropylene fiber, ethylene-methacrylic acid copolymer, a light stabilizer 622, an antioxidant 1010, an initiator, a functional modifier and a lubricant into a high-speed mixer for melt blending to enable incompatible nano ZnO, PE plastic and modified polypropylene fiber to be compounded together through a double percolation effect, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulation, cooling and air drying to obtain a functional surface layer granule;
3) co-extrusion molding: add toper double screw extruder with sandwich layer granule material, through the transport of toper double screw, the heating, it extrudes the inside passage that makes sandwich layer granule material get into crowded mould altogether to cut and smelt forms the sandwich layer, simultaneously add single screw extruder with function surface course granule material, through the transport of single screw, the heating, the compression, the outside passageway that the extrusion made function surface course granule material get into crowded mould altogether with the all-round cladding of sandwich layer with the smelting, the reshaping, the knurling, cooling and cutting, it moulds crowded combined material altogether (ectonexine structure) to obtain nanometer wood, gross thickness 23mm, function surface course thickness 0.5mm, sandwich layer thickness 22 mm.
Example 2:
the nano wood-plastic co-extrusion composite material consists of a core layer and a functional surface layer for coating the core layer, wherein the core layer and the functional surface layer consist of the following components:
TABLE 2 composition table of core layer and functional surface layer of nano wood-plastic co-extruded composite material
The preparation method of the nano wood-plastic co-extrusion composite material comprises the following steps:
1) preparing core layer granules: fully drying wood powder, adding the wood powder, PE plastic, ethylene-acrylic acid copolymer, antioxidant 1010, ethylene bis stearamide and talcum powder into a high-speed mixer, carrying out high-speed blending, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulating, air-drying and cooling to obtain core layer granules;
2) preparing functional surface layer granules: pretreating nano ZnO by using a coupling agent, blending the pretreated nano ZnO and an ethylene-acrylic acid copolymer to enable the ethylene-acrylic acid copolymer to fully infiltrate the nano ZnO, adding the infiltrated nano ZnO, PE plastic, modified polypropylene fiber, ethylene-methacrylic acid copolymer, a light stabilizer 622, an antioxidant 1010, an initiator, a functional modifier and a lubricant into a high-speed mixer for melt blending to enable incompatible nano ZnO, PE plastic and modified polypropylene fiber to be compounded together through a double percolation effect, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulation, cooling and air drying to obtain a functional surface layer granule;
3) co-extrusion molding: add toper double screw extruder with sandwich layer granule material, through the transport of toper double screw, the heating, it extrudes the inside passage that makes sandwich layer granule material get into crowded mould altogether to cut and smelt forms the sandwich layer, simultaneously add single screw extruder with function surface course granule material, through the transport of single screw, the heating, the compression, the outside passageway that the extrusion made function surface course granule material get into crowded mould altogether with the all-round cladding of sandwich layer with the smelting, the reshaping, the knurling, cooling and cutting, it moulds crowded combined material altogether (ectonexine structure) to obtain nanometer wood, gross thickness 23mm, function surface course thickness 0.5mm, sandwich layer thickness 22 mm.
Example 3:
the nano wood-plastic co-extrusion composite material consists of a core layer and a functional surface layer for coating the core layer, wherein the core layer and the functional surface layer consist of the following components:
TABLE 3 composition table of core layer and functional surface layer of nano wood-plastic co-extruded composite material
The preparation method of the nano wood-plastic co-extrusion composite material comprises the following steps:
1) preparing core layer granules: fully drying wood powder, adding the wood powder, PE plastic, ethylene-acrylic acid copolymer, antioxidant 1010, ethylene bis stearamide and talcum powder into a high-speed mixer, carrying out high-speed blending, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulating, air-drying and cooling to obtain core layer granules;
2) preparing functional surface layer granules: pretreating nano ZnO by using a coupling agent, blending the pretreated nano ZnO and an ethylene-acrylic acid copolymer to enable the ethylene-acrylic acid copolymer to fully infiltrate the nano ZnO, adding the infiltrated nano ZnO, PE plastic, modified polypropylene fiber, ethylene-methacrylic acid copolymer, a light stabilizer 622, an antioxidant 1010, an initiator, a functional modifier and a lubricant into a high-speed mixer for melt blending to enable incompatible nano ZnO, PE plastic and modified polypropylene fiber to be compounded together through a double percolation effect, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulation, cooling and air drying to obtain a functional surface layer granule;
3) co-extrusion molding: add toper double screw extruder with sandwich layer granule material, through the transport of toper double screw, the heating, it extrudes the inside passage that makes sandwich layer granule material get into crowded mould altogether to cut and smelt forms the sandwich layer, simultaneously add single screw extruder with function surface course granule material, through the transport of single screw, the heating, the compression, the outside passageway that the extrusion made function surface course granule material get into crowded mould altogether with the all-round cladding of sandwich layer with the smelting, the reshaping, the knurling, cooling and cutting, it moulds crowded combined material altogether (ectonexine structure) to obtain nanometer wood, gross thickness 23mm, function surface course thickness 0.5mm, sandwich layer thickness 22 mm.
Example 4:
the nano wood-plastic co-extrusion composite material consists of a core layer and a functional surface layer for coating the core layer, wherein the core layer and the functional surface layer consist of the following components:
TABLE 4 composition table of core layer and functional surface layer of nano wood-plastic co-extruded composite material
The preparation method of the nano wood-plastic co-extrusion composite material comprises the following steps:
1) preparing core layer granules: fully drying wood powder, adding the wood powder, PE plastic, ethylene-acrylic acid copolymer, antioxidant 1010, ethylene bis stearamide and talcum powder into a high-speed mixer, carrying out high-speed blending, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulating, air-drying and cooling to obtain core layer granules;
2) preparing functional surface layer granules: pretreating nano ZnO by using a coupling agent, blending the pretreated nano ZnO and an ethylene-acrylic acid copolymer to enable the ethylene-acrylic acid copolymer to fully infiltrate the nano ZnO, adding the infiltrated nano ZnO, PE plastic, modified polypropylene fiber, ethylene-methacrylic acid copolymer, a light stabilizer 622, an antioxidant 1010, an initiator, a functional modifier and a lubricant into a high-speed mixer for melt blending to enable incompatible nano ZnO, PE plastic and modified polypropylene fiber to be compounded together through a double percolation effect, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulation, cooling and air drying to obtain a functional surface layer granule;
3) co-extrusion molding: add toper double screw extruder with sandwich layer granule material, through the transport of toper double screw, the heating, it extrudes the inside passage that makes sandwich layer granule material get into crowded mould altogether to cut and smelt forms the sandwich layer, simultaneously add single screw extruder with function surface course granule material, through the transport of single screw, the heating, the compression, the outside passageway that the extrusion made function surface course granule material get into crowded mould altogether with the all-round cladding of sandwich layer with the smelting, the reshaping, the knurling, cooling and cutting, it moulds crowded combined material altogether (ectonexine structure) to obtain nanometer wood, gross thickness 23mm, function surface course thickness 0.5mm, sandwich layer thickness 22 mm.
Example 5:
the nano wood-plastic co-extrusion composite material consists of a core layer and a functional surface layer for coating the core layer, wherein the core layer and the functional surface layer consist of the following components:
TABLE 5 composition table of core layer and functional surface layer of nano wood-plastic co-extruded composite material
The preparation method of the nano wood-plastic co-extrusion composite material comprises the following steps:
1) preparing core layer granules: fully drying wood powder, adding the wood powder, PE plastic, ethylene-acrylic acid copolymer, antioxidant 1010, ethylene bis stearamide and talcum powder into a high-speed mixer, carrying out high-speed blending, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulating, air-drying and cooling to obtain core layer granules;
2) preparing functional surface layer granules: pretreating nano ZnO by using a coupling agent, blending the pretreated nano ZnO and an ethylene-acrylic acid copolymer to enable the ethylene-acrylic acid copolymer to fully infiltrate the nano ZnO, adding the infiltrated nano ZnO, PE plastic, modified polypropylene fiber, ethylene-methacrylic acid copolymer, a light stabilizer 622, an antioxidant 1010, an initiator, a functional modifier and a lubricant into a high-speed mixer for melt blending to enable incompatible nano ZnO, PE plastic and modified polypropylene fiber to be compounded together through a double percolation effect, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulation, cooling and air drying to obtain a functional surface layer granule;
3) co-extrusion molding: add toper double screw extruder with sandwich layer granule material, through the transport of toper double screw, the heating, it extrudes the inside passage that makes sandwich layer granule material get into crowded mould altogether to cut and smelt forms the sandwich layer, simultaneously add single screw extruder with function surface course granule material, through the transport of single screw, the heating, the compression, the outside passageway that the extrusion made function surface course granule material get into crowded mould altogether with the all-round cladding of sandwich layer with the smelting, the reshaping, the knurling, cooling and cutting, it moulds crowded combined material altogether (ectonexine structure) to obtain nanometer wood, gross thickness 23mm, function surface course thickness 0.5mm, sandwich layer thickness 22 mm.
Comparative example:
a commercially available wood-plastic composite (single layer structure, thickness 23 mm).
Test example:
the performance test of the wood-plastic composite materials of the examples 1 to 5 and the comparative example is carried out, and the test results are shown in the following table:
TABLE 6 Performance test results of the wood-plastic composites of examples 1 to 5 and comparative examples
Note:
and (4) testing standard: GB/T245908-one 2009.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a crowded combined material altogether is moulded to nanometer wood, comprises sandwich layer and the functional surface course that is used for cladding sandwich layer, its characterized in that: the core layer comprises the following components in percentage by mass:
plant fiber: 35% -70%;
PE plastic: 20 to 40 percent;
a compatilizer: 0.5 to 5 percent;
antioxidant: 0.1 to 0.5 percent;
lubricant: 1% -4%;
talc powder: 5% -20%;
the functional surface layer comprises the following components in percentage by mass:
PE plastic: 15% -50%;
modified polypropylene fiber: 5% -15%;
ethylene-methacrylic acid copolymer: 15% -40%;
an interface modifier: 5% -15%;
nano inorganic particles: 1% -5%;
light stabilizer: 0.2% -1%;
antioxidant: 0.1 to 0.5 percent;
other auxiliary agents: 1 to 10 percent.
2. The nano wood-plastic co-extruded composite material as claimed in claim 1, wherein: the core layer comprises the following components in percentage by mass:
plant fiber: 45 to 65 percent;
PE plastic: 25 to 35 percent;
a compatilizer: 2% -5%;
antioxidant: 0.1 to 0.5 percent;
lubricant: 1% -4%;
talc powder: 5% -15%;
the functional surface layer comprises the following components in percentage by mass:
PE plastic: 20 to 30 percent;
modified polypropylene fiber: 10% -15%;
ethylene-methacrylic acid copolymer: 30% -40%;
an interface modifier: 10% -15%;
nano inorganic particles: 1% -5%;
light stabilizer: 0.3 to 0.7 percent;
antioxidant: 0.3 to 0.5 percent;
other auxiliary agents: 5 to 10 percent.
3. The nano wood-plastic co-extruded composite material as claimed in claim 1 or 2, wherein: the thickness of the core layer is 5-150 mm, and the thickness of the functional surface layer is 0.5-2 mm.
4. The nano wood-plastic co-extruded composite material as claimed in claim 1 or 2, wherein: the compatilizer is at least one of ethylene-acrylic acid copolymer, maleic anhydride grafted paraffin and maleic anhydride grafted ethylene-vinyl acetate copolymer.
5. The nano wood-plastic co-extruded composite material as claimed in claim 1 or 2, wherein: the length-diameter ratio of the modified polypropylene fiber is more than or equal to 100.
6. The nano wood-plastic co-extruded composite material as claimed in claim 1 or 2, wherein: the interface modifier is at least one of ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, maleic anhydride grafted polyolefin elastomer and maleic anhydride grafted ethylene-vinyl acetate copolymer.
7. The nano wood-plastic co-extruded composite material as claimed in claim 1 or 2, wherein: the nano inorganic particles are nano ZnO and nano TiO2Nano SiO2Nano Al2O3At least one of (1).
8. The nano wood-plastic co-extruded composite material as claimed in claim 1 or 2, wherein: the light stabilizer is at least one of 2-hydroxy-4-n-octoxy benzophenone, poly (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidine ethanol) succinate and triazine-piperidine condensate.
9. The nano wood-plastic co-extruded composite material as claimed in claim 1 or 2, wherein: the other auxiliary agents comprise 1 to 4 percent of coupling agent, 0.5 to 2 percent of initiator, 0.5 to 2 percent of functional modifier and 0.5 to 2 percent of lubricant.
10. The preparation method of the nano wood-plastic co-extrusion composite material as claimed in any one of claims 1 to 9, which is characterized in that: the method comprises the following steps:
1) preparing core layer granules: fully drying the plant fiber, adding the plant fiber, the PE plastic, the compatilizer, the antioxidant, the lubricant and the talcum powder into a high-speed mixer, carrying out high-speed blending, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulating, air-drying and cooling to obtain core layer granules;
2) preparing functional surface layer granules: pretreating nano inorganic particles by using a coupling agent, blending the pretreated nano inorganic particles and an interface modifier to enable the interface modifier to fully infiltrate the nano inorganic particles, adding the infiltrated nano inorganic particles, PE plastic, modified polypropylene fiber, ethylene-methacrylic acid copolymer, a light stabilizer, an antioxidant, an initiator, a functional modifier and a lubricant into a high-speed mixer for melt blending to enable incompatible nano inorganic particles, the PE plastic and the modified polypropylene fiber to be compounded together through a double percolation effect, adding the obtained blend into a granulation production line, and carrying out melting, mixing, granulation, cooling and air drying to obtain a functional surface layer granule;
3) co-extrusion molding: add toper double screw extruder with sandwich layer granule material, through the transport of toper double screw, the heating, it extrudes to cut and smelt makes sandwich layer granule material get into the inside passage of crowded mould altogether and forms the sandwich layer, simultaneously with the single screw extruder of functional surface course granule material addition, through the transport of single screw, the heating, the compression, the friction is extruded with smelting and is made the outside passageway that functional surface course granule material got into crowded mould altogether cladding sandwich layer all-round, the reshaping, the knurling, the cooling and the cutting, obtain nanometer wood and mould crowded combined material altogether.
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