CN110885565A - Anti-aging wood-plastic composite material - Google Patents
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
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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
- 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
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention discloses an anti-aging wood-plastic composite material, which comprises the following raw materials: high-density polyethylene, plant fiber, modified high-density polyethylene, vitrified micro bubbles, carbon filler, ethylene bis stearamide, polyethylene wax, ethylene-vinyl alcohol copolymer, diisodecyl phthalate and silane coupling agent; the preparation process of the modified high-density polyethylene comprises the following steps: modifying zinc borate by taking a silane coupling agent KH-570 as a modifier to obtain coupling agent modified zinc borate; adding high-density polyethylene into a reaction device, adding coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene, uniformly stirring, adding an isolating agent, introducing chlorine, heating, raising the temperature to perform reaction, stopping introducing chlorine and heating after the reaction is finished, and performing post-treatment to obtain the modified high-density polyethylene. The anti-aging wood-plastic composite material provided by the invention has the advantages of good anti-aging property, high strength and long service life.
Description
Technical Field
The invention relates to the technical field of wood-plastic materials, in particular to an anti-aging wood-plastic composite material.
Background
The wood-plastic composite material is a novel green environment-friendly composite material prepared by mixing wood (or other plant fibers) and thermoplastic plastics according to a certain proportion, adding an auxiliary agent, and carrying out processes such as high-temperature extrusion, molding and the like, integrates the dual advantages of wood and plastic, effectively solves certain performance defects of a single raw material, has the advantages of wide raw material source, good water resistance and corrosion resistance, low price and the like, and is widely applied to industries such as building materials, furniture, logistics packaging and the like at present. However, most of the existing wood-plastic composite materials have the defect of relatively low mechanical strength due to poor compatibility and weak interfacial interaction force of plastics and plant fibers, and meanwhile, wood-plastic products are commonly used outdoors and are easily damaged by natural conditions such as ultraviolet rays, wind and rain, snow, microorganisms and the like after being exposed outdoors for a long time, so that the wood-plastic composite materials are easily cracked, faded and aged, the service life of the wood-plastic composite materials is shortened, the application range of the wood-plastic composite materials is limited, and the wood-plastic composite materials need to be modified to improve the mechanical property and the aging resistance of the wood-plastic composite materials.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides an anti-aging wood-plastic composite material which is good in anti-aging property, high in strength and long in service life.
The invention provides an aging-resistant wood-plastic composite material which comprises the following raw materials in parts by weight: 38-70 parts of high-density polyethylene, 55-95 parts of plant fiber, 3.5-7 parts of modified high-density polyethylene, 3-5.8 parts of vitrified micro-beads, 1-3.2 parts of carbon filler, 0.7-2 parts of ethylene bis stearamide, 0.5-1.7 parts of polyethylene wax, 0.5-2.2 parts of ethylene-vinyl alcohol copolymer, 1.1-2.2 parts of diisodecyl phthalate and 0.1-0.35 part of silane coupling agent;
the preparation process of the modified high-density polyethylene comprises the following steps: modifying zinc borate by taking a silane coupling agent KH-570 as a modifier to obtain coupling agent modified zinc borate; adding high-density polyethylene into a reaction device, adding coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene, uniformly stirring, then adding an isolating agent, introducing chlorine, heating, raising the temperature to perform reaction, stopping introducing chlorine and heating after the reaction is finished, and performing post-treatment to obtain the modified high-density polyethylene.
Preferably, the plant fiber is flax fiber and fir wood powder in a weight ratio of 7-12: 1-3.
Preferably, the aspect ratio of the flax fibers is 14-20; the particle size of the fir wood powder is 20-60 meshes.
Preferably, the carbon filler is one or a mixture of carbon black, graphite, carbon nanotubes and carbon fibers.
Preferably, the ethylene-vinyl alcohol copolymer has a molar content of ethylene of 40 to 55%.
Preferably, the silane coupling agent is a mixture of one or more of a silane coupling agent KH-550, a silane coupling agent KH-560 and a silane coupling agent KH-570.
Preferably, in the preparation process of the modified high-density polyethylene, the weight ratio of the zinc borate to the silane coupling agent KH-570 is 1: 0.1-0.22; the weight ratio of the high-density polyethylene, the coupling agent modified zinc borate, the methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester to the styrene is 70-85: 3-7: 5-9: 7-11.
Preferably, in the preparation process of the modified high-density polyethylene, the release agent is one or a mixture of calcium carbonate, white carbon black and talcum powder, and the weight of the release agent is 0.05-0.1 times of that of the high-density polyethylene.
Preferably, the flow rate of the chlorine gas is 10 to 12mmol/min in the preparation process of the modified high-density polyethylene.
Preferably, in the preparation process of the modified high-density polyethylene, the temperature is raised to 120-135 ℃ for reaction for 5-11 h.
Preferably, the water content of the plant fiber is less than or equal to 3 wt%.
Preferably, in the preparation process of the modified high-density polyethylene, the specific step of modifying the zinc borate by using the silane coupling agent KH-570 as a modifying agent comprises the following steps: adding a silane coupling agent KH-570 into xylene, uniformly stirring to obtain a mixture, spraying the mixture on zinc borate, then adding the mixture into a kneader, stirring for 30-50min at room temperature, and then modifying for 80-120min at the conditions of the rotation speed of 600-700r/min and the temperature of 72-78 ℃.
Preferably, in the preparation process of the modified high-density polyethylene, the high-density polyethylene is pre-dried at 45-50 ℃ for 100-120 min.
Preferably, in the preparation of the modified high density polyethylene, the post-treatment comprises the following steps: removing chlorine gas in vacuum, placing in a fume hood, standing for 30-40h, adding xylene, heating, pouring into ethanol, stirring, filtering, drying, adding xylene, heating, pouring into acetone, stirring, filtering, and drying.
The aging-resistant wood-plastic composite material is prepared by specifically selecting specific modified high-density polyethylene as a raw material, in the preparation process of the modified high-density polyethylene, firstly modifying zinc borate by taking a silane coupling agent KH-570 as a modifier so as to introduce double bonds to the surface of the zinc borate to obtain coupling agent modified zinc borate, then chlorinating the high-density polyethylene by taking the coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene as raw materials, and carrying out a grafting reaction under the action of chlorine gas so as to graft the zinc borate, the styrene and methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester to a chlorinated high-density polyethylene molecule to obtain the modified high-density polyethylene, the zinc borate is added into a system, on one hand, because zinc borate and hindered amine light stabilizer methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester are introduced into molecules, the zinc borate and the hindered amine light stabilizer methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester have synergistic effect, the damage of ultraviolet light to the wood-plastic composite material can be effectively prevented under the assistance of vitrified micro-beads and carbon filler, the change of the surface color of the wood-plastic composite material is inhibited, the aging resistance of the composite material is obviously improved, the service life of the wood-plastic composite material is prolonged, on the other hand, inorganic materials and organic materials are combined into a whole, structures such as styrene, chlorine and the like are introduced, the zinc borate can be used as a compatilizer, the dispersibility of the zinc borate in the system is improved, the zinc borate is matched with ethylene-vinyl alcohol copolymer, diisodecyl phthalate and silane coupling, the strength of the obtained material is high; in a preferred mode, flax fibers with the length-diameter ratio of 14-20 and fir wood powder with the particle size of 20-60 meshes are specifically selected according to the weight ratio of 7-12: the mixture of 1-3 is used as plant fiber, flax fiber and high-density polyethylene are embedded and interpenetrated with each other to form a three-dimensional network structure, and fir powder fills gaps of the network structure, so that the mechanical strength of the wood-plastic composite material is further improved.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
An aging-resistant wood-plastic composite material comprises the following raw materials in parts by weight: 70 parts of high-density polyethylene, 95 parts of plant fiber, 3.5 parts of modified high-density polyethylene, 5.8 parts of vitrified micro bubbles, 3.2 parts of carbon filler, 1 part of ethylene bis stearamide, 0.6 part of polyethylene wax, 2 parts of ethylene-vinyl alcohol copolymer, 1.1 parts of diisodecyl phthalate and 0.21 part of silane coupling agent;
the preparation process of the modified high-density polyethylene comprises the following steps: modifying zinc borate by taking a silane coupling agent KH-570 as a modifier to obtain coupling agent modified zinc borate; adding high-density polyethylene into a reaction device, adding coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene, uniformly stirring, then adding an isolating agent, introducing chlorine, heating, raising the temperature to perform reaction, stopping introducing chlorine and heating after the reaction is finished, and performing post-treatment to obtain the modified high-density polyethylene.
Example 2
An aging-resistant wood-plastic composite material comprises the following raw materials in parts by weight: 38 parts of high-density polyethylene, 84 parts of flax fiber with the length-diameter ratio of 14, 7 parts of fir wood powder with the particle size of 20 meshes, 7 parts of modified high-density polyethylene, 4 parts of vitrified micro bubbles, 1 part of carbon black, 2 parts of ethylene bis-stearamide, 1.7 parts of polyethylene wax, 2.2 parts of ethylene-vinyl alcohol copolymer with the ethylene molar content of 45%, 2.2 parts of diisodecyl phthalate, KH-5500.1 parts of silane coupling agent and KH-5600.25 parts of silane coupling agent;
the preparation process of the modified high-density polyethylene comprises the following steps: modifying zinc borate by taking a silane coupling agent KH-570 as a modifying agent to obtain coupling agent modified zinc borate, wherein the weight ratio of zinc borate to the silane coupling agent KH-570 is 1: 0.1; adding high-density polyethylene into a reaction device, adding coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene, and uniformly stirring, wherein the weight ratio of the high-density polyethylene, the coupling agent modified zinc borate, the methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and the styrene is 85: 6: 5: and 8, adding calcium carbonate serving as a separant, wherein the weight of the calcium carbonate serving as the separant is 0.06 times that of the high-density polyethylene, introducing chlorine at the flow rate of 10mmol/min, heating to 122 ℃ for reaction for 10 hours, stopping introducing chlorine and heating after the reaction is finished, and performing post-treatment to obtain the modified high-density polyethylene.
Example 3
An aging-resistant wood-plastic composite material comprises the following raw materials in parts by weight: 42 parts of high-density polyethylene, 38.5 parts of flax fiber, 16.5 parts of China fir powder, 6 parts of modified high-density polyethylene, 3 parts of vitrified micro-beads, 1 part of graphite, 0.3 part of carbon fiber, 0.7 part of ethylene bis-stearamide, 0.5 part of polyethylene wax, 0.5 part of ethylene-vinyl alcohol copolymer, 1.4 parts of diisodecyl phthalate and KH-5500.1 parts of silane coupling agent;
wherein the length-diameter ratio of the flax fibers is 20; the particle size of the fir wood powder is 40 meshes;
in the ethylene-vinyl alcohol copolymer, the molar content of ethylene is 55 percent;
the preparation process of the modified high-density polyethylene comprises the following steps: modifying zinc borate by taking a silane coupling agent KH-570 as a modifying agent to obtain coupling agent modified zinc borate, wherein the weight ratio of zinc borate to the silane coupling agent KH-570 is 1: 0.22; adding high-density polyethylene into a reaction device, adding coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene, and uniformly stirring, wherein the weight ratio of the high-density polyethylene, the coupling agent modified zinc borate, the methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and the styrene is 70: 7: 9: 10, adding a separant white carbon black, wherein the weight of the separant white carbon black is 0.1 time of that of the high-density polyethylene, introducing chlorine, heating to 135 ℃ for reaction for 5 hours, stopping introducing the chlorine and heating after the reaction is finished, and performing post-treatment to obtain the modified high-density polyethylene; in the preparation process of the modified high-density polyethylene, the flow rate of the introduced chlorine is 12 mmol/min.
Example 4
An aging-resistant wood-plastic composite material comprises the following raw materials in parts by weight: 65 parts of high-density polyethylene, 58 parts of plant fiber with the water content of 3 wt%, 4 parts of modified high-density polyethylene, 4 parts of vitrified micro-beads, 1 part of carbon black, 1 part of carbon nano tube, 1 part of carbon fiber, 1.2 parts of ethylene bis-stearamide, 1 part of polyethylene wax, 0.9 part of ethylene-vinyl alcohol copolymer, 2 parts of diisodecyl phthalate and KH-5700.2 parts of silane coupling agent;
wherein the plant fiber is flax fiber and fir wood powder according to the weight ratio of 9: 2, the length-diameter ratio of the flax fiber is 14, and the grain size of the fir wood powder is 30 meshes;
in the ethylene-vinyl alcohol copolymer, the molar content of ethylene is 40%;
the preparation process of the modified high-density polyethylene comprises the following steps: adding a silane coupling agent KH-570 into dimethylbenzene, uniformly stirring to obtain a mixture, spraying the mixture on zinc borate, then adding the mixture into a kneader, stirring for 50min at room temperature, and then modifying for 80min at the conditions that the rotating speed is 600r/min and the temperature is 78 ℃ to obtain coupling agent modified zinc borate, wherein the weight ratio of zinc borate to the silane coupling agent KH-570 is 1: 0.18 of; predrying high-density polyethylene at 50 ℃ for 100min to obtain dried high-density polyethylene, adding the dried high-density polyethylene into a reaction device, adding coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene, and uniformly stirring, wherein the weight ratio of the dried high-density polyethylene, the coupling agent modified zinc borate, the methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and the styrene is 73: 3: 7: 7, adding a mixture of calcium carbonate and white carbon black, wherein the weight of the mixture of calcium carbonate and white carbon black is 0.05 times of that of the added high-density polyethylene, introducing chlorine, heating to 120 ℃ for reaction for 11 hours, stopping introducing chlorine and heating after the reaction is finished, vacuumizing the chlorine, placing the mixture in a fume hood for 30 hours, adding xylene for heating, pouring the mixture into ethanol while the mixture is hot, stirring for 30 minutes, filtering, drying, adding xylene for heating, pouring the mixture into acetone while the mixture is hot, stirring for 30 minutes, filtering, and drying at 50 ℃ to constant weight to obtain the modified high-density polyethylene; during the reaction, the flow rate of chlorine gas was 11 mmol/min.
Example 5
An aging-resistant wood-plastic composite material comprises the following raw materials in parts by weight: 40 parts of high-density polyethylene, 80 parts of flax fiber with the length-diameter ratio of 20, 8 parts of fir wood powder with the particle size of 40 meshes, 5 parts of modified high-density polyethylene, 5.5 parts of vitrified micro bubbles, 1.2 parts of carbon black, 1.8 parts of ethylene bis stearamide, 0.7 part of polyethylene wax, 1.6 parts of ethylene-vinyl alcohol copolymer with the ethylene molar content of 45 percent, 1.3 parts of diisodecyl phthalate and KH-5600.3 parts of silane coupling agent;
the preparation process of the modified high-density polyethylene comprises the following steps: adding a silane coupling agent KH-570 into xylene, uniformly stirring to obtain a mixture, spraying the mixture on zinc borate, wherein the weight ratio of the zinc borate to the silane coupling agent KH-570 is 1: 0.15, adding the mixture into a kneader, stirring the mixture for 30min at room temperature, and modifying the mixture for 120min at the rotating speed of 700r/min and the temperature of 72 ℃ to obtain coupling agent modified zinc borate; predrying high-density polyethylene at 48 ℃ for 110min, adding the high-density polyethylene into a reaction device, adding coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene, and uniformly stirring, wherein the weight ratio of the high-density polyethylene, the coupling agent modified zinc borate, the methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and the styrene added into the reaction device is 82: 4: 8: 8, adding calcium carbonate, wherein the weight of the calcium carbonate is 0.09 time of that of the added high-density polyethylene, introducing chlorine, heating to 132 ℃ for reaction for 7 hours, stopping introducing the chlorine and heating after the reaction is finished, removing the chlorine in vacuum, placing in a fume hood for 40 hours, adding xylene for heating, pouring into ethanol while the solution is hot, stirring for 40 minutes, filtering, drying, adding xylene for heating, pouring into acetone while the solution is hot, stirring for 50 minutes, filtering, and drying to obtain the modified high-density polyethylene; in the preparation process of the modified high-density polyethylene, the flow rate of the introduced chlorine gas is 11 mmol/min.
Example 6
An aging-resistant wood-plastic composite material comprises the following raw materials in parts by weight: 55 parts of high-density polyethylene, 55 parts of flax fiber with the length-diameter ratio of 15, 15 parts of fir wood powder with the particle size of 60 meshes, 5 parts of modified high-density polyethylene, 4 parts of vitrified micro bubbles, 2.5 parts of carbon nano tubes, 1.5 parts of ethylene bis stearamide, 1 part of polyethylene wax, 1 part of ethylene-vinyl alcohol copolymer with the ethylene molar content of 48 percent, 1.5 parts of diisodecyl phthalate and KH-5500.2 parts of silane coupling agent;
the preparation process of the modified high-density polyethylene comprises the following steps: adding a silane coupling agent KH-570 into xylene, uniformly stirring to obtain a mixture, and spraying the mixture on zinc borate, wherein the weight ratio of zinc borate to the silane coupling agent KH-570 is 1: 0.2, adding the mixture into a kneader, stirring the mixture for 40min at room temperature, and modifying the mixture for 100min at the rotation speed of 650r/min and the temperature of 75 ℃ to obtain coupling agent modified zinc borate; predrying high-density polyethylene at 45 ℃ for 120min, adding the high-density polyethylene into a reaction device, adding coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene, and uniformly stirring, wherein the weight ratio of the high-density polyethylene, the coupling agent modified zinc borate, the methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and the styrene added into the reaction device is 73: 6: 6: 10, adding a separant white carbon black, wherein the weight of the separant white carbon black is 0.07 time of that of the added high-density polyethylene, introducing chlorine, heating to 123 ℃ for reaction for 9 hours, stopping introducing the chlorine and heating after the reaction is finished, removing the chlorine in vacuum, placing in a fume hood for 35 hours, adding xylene for heating, pouring into ethanol while hot, stirring for 60 minutes, filtering, drying, adding xylene for heating, pouring into acetone while hot, stirring for 30 minutes, filtering, and drying at 60 ℃ to obtain the modified high-density polyethylene; in the preparation process of the modified high-density polyethylene, the flow rate of the introduced chlorine gas is 11.5 mmol/min.
The performance of the aging-resistant wood-plastic composite material in the embodiment is detected, and the tensile strength is 47.27MPa, and the flexural modulus of elasticity is 4574 MPa; after 2500h of UV accelerated ageing, the color difference Δ E was 9.2 and the whiteness Δ L was 8.12.
Comparative example 1
The only difference from example 6 is that: the modified high density polyethylene of example 6 was not contained in the raw material.
The performance of the wood-plastic composite material in the comparative example is detected, the tensile strength is 31.56MPa, and the flexural modulus of elasticity is 3211 MPa; the UV accelerated ageing was 2500h, the color difference Δ E was 16.42 and the whiteness Δ L was 16.2.
Comparative example 2
The only difference from example 6 is that: 55 parts of flax fiber with the length-diameter ratio of 8 and 15 parts of fir wood powder with the particle size of 80 meshes are used for replacing 55 parts of flax fiber with the length-diameter ratio of 15 and 15 parts of fir wood powder with the particle size of 60 meshes in example 6.
The performance of the wood-plastic composite material in the comparative example is detected, the tensile strength is 41.47MPa, and the flexural modulus of elasticity is 4213 MPa; the UV accelerated ageing was 2500h, the color difference Δ E was 10.1 and the whiteness Δ L was 9.7.
Comparative example 3
The only difference from example 6 is that: 55 parts of flax fiber with the length-diameter ratio of 22 and 15 parts of fir wood powder with the particle size of 100 meshes are used for replacing 55 parts of flax fiber with the length-diameter ratio of 15 and 15 parts of fir wood powder with the particle size of 60 meshes in example 6.
The performance of the wood-plastic composite material in the comparative example is detected, the tensile strength is 43.11MPa, and the flexural modulus of elasticity is 4022 MPa; the UV accelerated ageing was 2500h, the color difference Δ E was 9.97 and the whiteness Δ L was 9.7.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The anti-aging wood-plastic composite material is characterized by comprising the following raw materials in parts by weight: 38-70 parts of high-density polyethylene, 55-95 parts of plant fiber, 3.5-7 parts of modified high-density polyethylene, 3-5.8 parts of vitrified micro-beads, 1-3.2 parts of carbon filler, 0.7-2 parts of ethylene bis stearamide, 0.5-1.7 parts of polyethylene wax, 0.5-2.2 parts of ethylene-vinyl alcohol copolymer, 1.1-2.2 parts of diisodecyl phthalate and 0.1-0.35 part of silane coupling agent;
the preparation process of the modified high-density polyethylene comprises the following steps: modifying zinc borate by taking a silane coupling agent KH-570 as a modifier to obtain coupling agent modified zinc borate; adding high-density polyethylene into a reaction device, adding coupling agent modified zinc borate, methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester and styrene, uniformly stirring, then adding an isolating agent, introducing chlorine, heating, raising the temperature to perform reaction, stopping introducing chlorine and heating after the reaction is finished, and performing post-treatment to obtain the modified high-density polyethylene.
2. The aging-resistant wood-plastic composite material as claimed in claim 1, wherein the plant fiber is flax fiber and fir wood powder in a weight ratio of 7-12: 1-3.
3. The aging-resistant wood-plastic composite material as claimed in claim 2, wherein the flax fibers have an aspect ratio of 14-20; the particle size of the fir wood powder is 20-60 meshes.
4. The aging-resistant wood-plastic composite material as claimed in claim 1, wherein the carbon filler is one or more of carbon black, graphite, carbon nanotubes and carbon fibers.
5. The aging-resistant wood-plastic composite material as claimed in claim 1, wherein the ethylene-vinyl alcohol copolymer has an ethylene molar content of 40-55%.
6. The aging-resistant wood-plastic composite material as claimed in claim 1, wherein the silane coupling agent is a mixture of one or more of a silane coupling agent KH-550, a silane coupling agent KH-560 and a silane coupling agent KH-570.
7. The aging-resistant wood-plastic composite material as claimed in claim 1, wherein in the preparation process of the modified high-density polyethylene, the weight ratio of the zinc borate to the silane coupling agent KH-570 is 1: 0.1-0.22; the weight ratio of the high-density polyethylene, the coupling agent modified zinc borate, the methacrylic acid-1, 2,2,6, 6-pentamethyl-4-piperidine ester to the styrene is 70-85: 3-7: 5-9: 7-11.
8. The aging-resistant wood-plastic composite material as claimed in claim 1, wherein in the preparation process of the modified high-density polyethylene, the release agent is one or a mixture of calcium carbonate, white carbon black and talcum powder, and the weight of the release agent is 0.05-0.1 times of the weight of the high-density polyethylene.
9. The aging-resistant wood-plastic composite material as claimed in claim 1, wherein the flow rate of chlorine gas introduced during the preparation of the modified high-density polyethylene is 10 to 12 mmol/min.
10. The aging-resistant wood-plastic composite material as recited in any one of claims 1-9, wherein during the preparation of the modified high density polyethylene, the temperature is raised to 120-135 ℃ for reaction for 5-11 h.
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| CN101024709A (en) * | 2007-02-06 | 2007-08-29 | 南京航空航天大学 | Moulding-grade wood-plastic composite and processing process |
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Application publication date: 20200317 |