CN112063193A - High-strength polypropylene wood veneer and preparation method thereof - Google Patents
High-strength polypropylene wood veneer and preparation method thereof Download PDFInfo
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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
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
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- 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
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
- C08L23/32—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing phosphorus or sulfur
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- 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
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
- C08L23/36—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing nitrogen, e.g. by nitration
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- 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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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a high-strength polypropylene wood-plastic plate and a preparation method thereof, and relates to the technical field of wood-plastic composite materials. The invention discloses a high-strength polypropylene wood veneer which is prepared from the following raw materials in parts by mass: 20-30 parts of modified polypropylene resin, 5-10 parts of polymethyl methacrylate, 20-30 parts of eucalyptus powder, 5-8 parts of organic bentonite, 27-36 parts of recycled bamboo-plastic powder, 0.5-1.0 part of silane coupling agent, 1-2 parts of talcum powder, 0.2-0.5 part of antioxidant, 0.5-1.5 parts of light stabilizer and 0.5-1.5 parts of sodium fatty alcohol-polyoxyethylene ether sulfate. The modified polypropylene resin and the eucalyptus powder in the polypropylene wood veneer provided by the invention have good compatibility, so that the wood veneer has high strength and toughness, is not easy to brittle failure, prolongs the service life, and has excellent flame retardance, waterproofness and thermal stability.
Description
Technical Field
The invention belongs to the technical field of wood-plastic composite materials, and particularly relates to a polypropylene wood veneer and a preparation method thereof.
Background
The wood veneer is a high-tech green environment-friendly novel decorative material which is mainly prepared by uniformly mixing wood (wood cellulose and plant cellulose) serving as a base material, a thermoplastic high polymer material, a processing aid and the like, and then heating and extruding the mixture by using die equipment, has the performance and characteristics of wood and plastic, and is a novel composite material capable of replacing the wood and the plastic. As a novel material, the wood-plastic composite material has rapid development in the industrial scale and the application field in recent years, and the research on the material is more and more deep. In recent years, under the dual promotion of encouragement of national recycling economy policy and potential benefit demand of enterprises, nationwide 'wood-plastic' heat is gradually rising, the yield of Chinese wood-plastic products in 2019 is close to 400 ten thousand tons, the yield accounts for two thirds of the total world yield, and production, sales, consumption and export are all in the first world. The wood veneer has the advantages of low cost and good comprehensive performance of wood and plastic, and is mainly used in industries such as building materials, furniture, logistics packaging and the like.
The plastic in the existing wood veneer board comprises thermoplastic high polymer materials such as polyethylene, polypropylene, polyvinyl chloride and the like, and the PE wood veneer board and the PVC wood veneer board are mainly used in the market, however, the PE wood veneer board product is heavy, high in hardness, large in brittleness and large in creep deformation; the PVC wood veneer product has light weight, poor hardness, good toughness and creep deformation; the PE wood veneer and the PVC wood veneer are both heat-resistant and are used at the temperature of 45 ℃. The research of PP as a polyolefin material with the second yield in wood-based plywood is active all the time, but the PP wood-based plywood has the characteristics of poor hardness, high brittleness and the like due to the fact that the melt temperature is rapidly increased and the PP molecules are degraded due to the fact that friction heat is generated in the processing process of wood-based plywood extruded products filled with high wood flour, and the extrusion processing efficiency is limited due to the fact that the extrusion pressure of the PP wood-based plywood is high, so that the practical use amount of PP resin in the wood-based plywood product industry is not large. With the increasing requirements of people on the green environmental protection of the wood-rubber plate and the development and application of the injection molding product of the wood-rubber plate, the PP resin is taken as the environmental-friendly resin, and the application of the PP resin in the field of the wood-rubber plate can meet a rapid development stage.
The Chinese invention patent CN103642120B discloses a polypropylene foaming wood-plastic plate, the wood-plastic composite section of the invention can passivate the tip of a crack and effectively prevent the expansion of the crack after foaming, the compactness of the finished product is high, the water resistance and the flame resistance are strong, the environment is protected, the energy is saved, but the wood-plastic plate has low hardness, is easy to break, has creep deformation, and has poor creep recovery rate. Chinese patent CN103509360B discloses a method for preparing nano glass fiber synergistic modified reinforced wood-plastic plate, which is prepared by carrying out S iO on nano particles2The wood-plastic board is high in strength, resistant to ultraviolet rays and long in service life, but the wood-plastic board is poor in interface compatibility, nanoparticles and glass fibers are easy to agglomerate, the dispersibility is poor, so that the wood-plastic board is easy to crisp and crack and poor in thermal stability, and the wood powder material has rich polar groups-hydroxyl on the surface and is hydrophilic, so that the size stability of a product is influenced due to overhigh water absorption rate.
Disclosure of Invention
The invention aims to provide a polypropylene wood veneer, which has good compatibility between modified polypropylene resin and eucalyptus powder, so that the wood veneer has high strength and toughness, is not easy to brittle failure, prolongs the service life, and has excellent flame retardance, waterproofness and thermal stability.
In order to realize the purpose of the invention, the invention provides a high-strength polypropylene wood veneer which is prepared from the following raw materials in parts by weight: 20-30 parts of modified polypropylene resin, 5-10 parts of polymethyl methacrylate, 20-30 parts of eucalyptus powder, 5-8 parts of organic bentonite, 27-36 parts of recycled bamboo-plastic powder, 0.5-1.0 part of silane coupling agent, 1-2 parts of talcum powder, 0.2-0.5 part of antioxidant, 0.5-1.5 parts of light stabilizer and 0.5-1.5 parts of sodium fatty alcohol-polyoxyethylene ether sulfate.
Further, the preparation method of the modified polypropylene resin comprises the following steps: adding urea, tricresyl phosphate, BPO and ethanol into a reaction kettle, and stirring for 0.5h at 40 DEG CAfter being mixed evenly, N is introduced into the reaction kettle2Replacing air for 0.5h, slowly heating to 100-120 ℃, adding the polypropylene powder and the antioxidant 1010, and reacting for 3-4h while stirring to obtain modified polypropylene resin; the weight of the urea is 2.4% of that of the polypropylene powder, the weight of the tricresyl phosphate is 3.1% of that of the polypropylene powder, the weight of the BPO is 0.4% of that of the polypropylene powder, the weight of the antioxidant 1010 is 0.1% of that of the polypropylene powder, and the ethanol is used for dissolving the urea, the tricresyl phosphate and the BPO and is in a proper amount.
Further, the particle size of the eucalyptus powder is 100-120 meshes.
Further, the eucalyptus powder is prepared by the following method: drying and crushing trunks and leaves of eucalyptus, washing the trunks and leaves with water, drying the trunks and leaves, adding the trunks and leaves into 70% hydrochloric acid solution to hydrolyze by 30min, neutralizing the mixture with sodium hydroxide solution, washing the neutralized mixture with distilled water to be neutral, and drying the neutralized mixture to obtain the eucalyptus powder.
Further, the polymerization degree of the polymethyl methacrylate is 1200-1500.
Further, the recycled bamboo-plastic powder is prepared from waste bamboo products and waste polyvinyl chloride plastics, and the mass ratio of the waste bamboo products to the waste polyvinyl chloride plastics is 1: (2-3).
Further, the antioxidant is one of triphenyl phosphite and acidic dodecyl phosphite.
Further, the light stabilizer is one of a benzophenone light stabilizer or a benzotriazole light stabilizer.
The preparation method of the high-strength polypropylene wood veneer comprises the following steps: uniformly mixing the polymethyl methacrylate, the eucalyptus powder and the organic bentonite, adding the trichloromethane, heating to 45 ℃ for reaction for 1h, then adding the modified polypropylene resin, the recovered bamboo-plastic powder, the silane coupling agent and the antioxidant, uniformly mixing, heating to 100 ℃ and 120 ℃ for reaction for 2-3h, adding the talcum powder, the light stabilizer and the fatty alcohol-polyoxyethylene ether sodium sulfate, melting, blending and extruding through a double-screw extruder, and molding to obtain the high-strength polypropylene wood veneer.
Further, the mass ratio of the trichloromethane to the polymethyl methacrylate is 3: 1.
The invention achieves the following beneficial effects:
1. under the action of trichloromethane, the end face and the layer face of the unit cell of the organic bentonite can be compounded with polymethyl methacrylate and eucalyptus powder, so that the bonding performance of the eucalyptus powder and the polymethyl methacrylate is enhanced, the dispersion effect and the compatibility of the polymethyl methacrylate and the eucalyptus powder in the modified polypropylene resin are improved, and the eucalyptus powder cannot be agglomerated in the processing process of the invention, so that the strength and the toughness of the invention are improved, the impact resistance is improved, and the brittle fracture is not easy to occur.
2. The polymethyl methacrylate has better compatibility with the eucalyptus powder under the action of the trichloromethane, and further enhances the compatibility of the eucalyptus powder with the modified polypropylene resin and the recycled bamboo-plastic powder. The addition of the polymethyl methacrylate improves the strength and toughness of the polypropylene wood veneer, improves the thermal stability of the polypropylene wood veneer, and reduces the molecular degradation effect of PP in the processing process.
3. The modified polypropylene resin is obtained by modifying polypropylene powder with urea and tricresyl phosphate, and under the action of BPO, an amide group and a phosphoric acid acyl group are introduced to a PP framework, so that the compatibility of PP and other raw materials of a wood veneer is improved, and the thermal decomposition property, the impact strength and the tensile strength of the modified polypropylene resin are also improved. The modified polypropylene resin is introduced with nitrogen-containing and phosphorus-containing groups, and the flame retardant property of the modified polypropylene resin is enhanced, so that the polypropylene wood veneer has excellent flame retardant property, and the strength and toughness of the polypropylene wood veneer are further improved.
4. The eucalyptus powder is prepared from trunks and leaves of the eucalyptus, the cellulose content of the eucalyptus is high, the eucalyptus is easy to plant, and the cost is low; the eucalyptus powder also contains thaumal, eucalyptol and other substances, and can be used for repelling mosquitoes and refreshing, so that the polypropylene wood veneer has the mosquito repelling effect and the special cool smell of eucalyptus, and the cost of the polypropylene wood veneer is reduced.
5. The recycled bamboo-plastic powder is added into the raw materials, so that waste bamboo products and plastic resources are fully utilized, wood resources and petroleum resources can be saved, the cost is saved, and the environment is protected. And the waste bamboo products also have the effects of absorbing ultraviolet rays, absorbing sound and insulating sound, and the waste polyethylene resin contains halogen and has a flame retardant effect, so the recycled bamboo-plastic powder improves the sound insulation effect and the flame retardant property of the invention.
6. According to the invention, the polypropylene resin is modified by urea and tricresyl phosphate, and then the modified polypropylene resin is subjected to composite reaction with raw materials such as polymethyl methacrylate, eucalyptus powder and recycled bamboo-plastic powder to prepare the polypropylene wood-plastic board. The modified polypropylene resin is prepared by grafting urea and tricresyl phosphate, so that the modified polypropylene has good flame retardance, the thermal stability of the modified polypropylene is improved, and the modified polypropylene is not easy to thermally decompose, and therefore, the flame retardance and the thermal stability of the wood veneer are further improved. The wood veneer is formed by compounding the raw materials, so that the raw materials in the wood veneer are organically combined, and the water resistance of the wood veneer is enhanced. The invention has the advantages of easily obtained and cheap raw materials, simple operation and industrial production.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The high-strength polypropylene wood-veneer according to the present invention and the method for preparing the same will be described with reference to the following specific examples.
Example 1
A high-strength polypropylene wood veneer is composed of the following raw materials in parts by weight: 20 parts of modified polypropylene resin, 10 parts of polymethyl methacrylate, 30 parts of eucalyptus powder, 8 parts of organic bentonite, 27 parts of recycled bamboo-plastic powder, 1.0 part of silane coupling agent, 2 parts of talcum powder, 0.2 part of triphenyl phosphite, UV-5310.8 parts of benzophenone light stabilizer and 1 part of fatty alcohol-polyoxyethylene ether sodium sulfate. The preparation method of the high-strength polypropylene wood veneer comprises the following steps:
(1) preparing modified polypropylene resin: adding urea, tricresyl phosphate, BPO and ethanol into a reaction kettle, stirring for 0.5h at 40 ℃, and introducing N into the reaction kettle after uniformly mixing2Replacing air for 0.5h, slowly heating to 100-120 ℃, adding the polypropylene powder and the antioxidant 1010, and reacting for 3-4h while stirring to obtain the modified polypropylene resin.
Wherein the adding amount of the urea is 2.4 percent of the mass of the polypropylene powder, the adding amount of the tricresyl phosphate is 3.1 percent of the mass of the polypropylene powder, the adding amount of the BPO is 0.4 percent of the mass of the polypropylene powder, the adding amount of the antioxidant 1010 is 0.1 percent of the mass of the polypropylene powder, and the ethanol is used for dissolving the urea, the tricresyl phosphate and the BPO in a proper amount.
(2) Preparing eucalyptus powder: drying and crushing trunk and leaves of eucalyptus, washing with water, drying, adding into 70% hydrochloric acid solution for hydrolysis by 30min, neutralizing with sodium hydroxide solution, washing with distilled water to neutrality, and drying to obtain eucalyptus powder.
The prepared eucalyptus powder is ground to obtain the eucalyptus powder with the particle size of 100-120 meshes for later use.
(3) Preparing and recovering bamboo-plastic powder: respectively recovering the waste bamboo products and the waste polyvinyl chloride, cleaning, drying, crushing, weighing the waste bamboo products and the waste polyvinyl chloride plastics in a mass ratio of 1:2, uniformly mixing, extruding, granulating and crushing to obtain the recovered bamboo-plastic powder.
(4) Weighing the wood veneer raw materials in parts by weight for later use.
(5) Uniformly mixing polymethyl methacrylate with the polymerization degree of 1200-1500, eucalyptus powder and organic bentonite, adding 30 parts of trichloromethane, heating to 45 ℃ for reaction for 1h, then adding modified polypropylene resin, recovering bamboo-plastic powder, a silane coupling agent and triphenyl phosphite, uniformly mixing, heating to 100-120 ℃ for reaction for 2-3h, adding talcum powder, benzophenone light stabilizer UV-531 and fatty alcohol-polyoxyethylene ether sodium sulfate, melting, blending and extruding through a double-screw extruder, controlling the temperature of the extruder to be 190 ℃, then placing the extruded mixture into a mold, and molding in the mold with the temperature of 170-180 ℃ for 5-10 min to obtain the high-strength polypropylene wood veneer.
It is noted that the silane coupling agent of the present invention (not limited to embodiment 1) may be one of the conventionally known silane coupling agents such as vinyltriethoxysilane, vinyltrimethoxysilane, isobutyltriethoxysilane, etc.
Example 2
A high-strength polypropylene wood veneer is composed of the following raw materials in parts by weight: 30 parts of modified polypropylene resin, 5 parts of polymethyl methacrylate, 20 parts of eucalyptus powder, 5 parts of organic bentonite, 36 parts of recycled bamboo-plastic powder, 0.5 part of silane coupling agent, 1 part of talcum powder, 0.5 part of acid dodecyl phosphite, 91.5 parts of benzophenone light stabilizer UV-91.5 parts, and 0.5 part of fatty alcohol-polyoxyethylene ether sodium sulfate. The preparation method of the high-strength polypropylene wood veneer comprises the following steps:
(1) preparing modified polypropylene resin: the preparation method and composition are the same as in example 1, with specific reference to step (1) of example 1.
(2) Preparing eucalyptus powder: the preparation method is the same as in example 1, with specific reference to step (2) of example 1.
The prepared eucalyptus powder is ground to obtain the eucalyptus powder with the particle size of 100-120 meshes for later use.
(3) Preparing and recovering bamboo-plastic powder: respectively recovering the waste bamboo products and the waste polyvinyl chloride, cleaning, drying, crushing, weighing the waste bamboo products and the waste polyvinyl chloride plastics in a mass ratio of 1:3, uniformly mixing, extruding, granulating and crushing to obtain the recovered bamboo-plastic powder.
(4) Weighing the wood veneer raw materials in parts by weight for later use.
(5) Uniformly mixing polymethyl methacrylate with the polymerization degree of 1200-1500, eucalyptus powder and organic bentonite, adding 15 parts of trichloromethane, heating to 45 ℃ for reaction for 1h, adding modified polypropylene resin, recovering bamboo-plastic powder, a silane coupling agent and acid dodecyl phosphite, uniformly mixing, heating to 100-120 ℃ for reaction for 2-3h, adding talcum powder, benzophenone light stabilizer UV-9 and fatty alcohol-polyoxyethylene ether sodium sulfate, melting, blending and extruding through a double-screw extruder, controlling the temperature of the extruder to be 190 ℃, placing the extruded mixture into a mold, and molding in the mold with the temperature of 170-180 ℃ for 5-10 min to obtain the high-strength polypropylene wood veneer.
Example 3
A high-strength polypropylene wood veneer is composed of the following raw materials in parts by weight: 23 parts of modified polypropylene resin, 7 parts of polymethyl methacrylate, 28 parts of eucalyptus powder, 7 parts of organic bentonite, 30 parts of recycled bamboo-plastic powder, 1 part of silane coupling agent, 1.6 parts of talcum powder, 0.4 part of acid dodecyl phosphite, UV-3260.5 parts of benzotriazole light stabilizer and 1.5 parts of fatty alcohol-polyoxyethylene ether sodium sulfate. The preparation method of the high-strength polypropylene wood veneer comprises the following steps:
(1) preparing modified polypropylene resin: the preparation method and composition are the same as in example 1, with specific reference to step (1) of example 1.
(2) Preparing eucalyptus powder: the preparation method is the same as in example 1, with specific reference to step (2) of example 1.
The prepared eucalyptus powder is ground to obtain the eucalyptus powder with the particle size of 100-120 meshes for later use.
(3) Preparing and recovering bamboo-plastic powder: respectively recovering the waste bamboo products and the waste polyvinyl chloride, cleaning, drying, crushing, weighing the waste bamboo products and the waste polyvinyl chloride plastics in a mass ratio of 1:3, uniformly mixing, extruding, granulating and crushing to obtain the recovered bamboo-plastic powder.
(4) Weighing the wood veneer raw materials in parts by weight for later use.
(5) Uniformly mixing polymethyl methacrylate with the polymerization degree of 1200-1500, eucalyptus powder and organic bentonite, adding 21 parts of trichloromethane, heating to 45 ℃ for reaction for 1h, adding modified polypropylene resin, recovering bamboo-plastic powder, a silane coupling agent and acid dodecyl phosphite, uniformly mixing, heating to 100-120 ℃ for reaction for 2-3h, adding talcum powder and benzotriazole light stabilizers UV-326 and fatty alcohol-polyoxyethylene ether sodium sulfate, melting, blending and extruding by a double-screw extruder, controlling the temperature of the extruder to be 170-190 ℃, placing the extruded mixture into a mold, and performing mold forming on the mixture in the mold with the temperature of 170-180 ℃ for 5-10 min to obtain the high-strength polypropylene wood veneer.
Example 4
A high-strength polypropylene wood veneer is composed of the following raw materials in parts by weight: 25 parts of modified polypropylene resin, 8 parts of polymethyl methacrylate, 25 parts of eucalyptus powder, 6 parts of organic bentonite, 31.4 parts of recycled bamboo-plastic powder, 0.8 part of silane coupling agent, 1.5 parts of talcum powder, 0.3 part of triphenyl phosphite, UV-3271 parts of benzotriazole light stabilizer and 1 part of sodium fatty alcohol-polyoxyethylene ether sulfate. The preparation method of the high-strength polypropylene wood veneer comprises the following steps:
(1) preparing modified polypropylene resin: the preparation method and composition are the same as in example 1, with specific reference to step (1) of example 1.
(2) Preparing eucalyptus powder: the preparation method is the same as in example 1, with specific reference to step (2) of example 1.
The prepared eucalyptus powder is ground to obtain the eucalyptus powder with the particle size of 100-120 meshes for later use.
(3) Preparing and recovering bamboo-plastic powder: respectively recovering the waste bamboo products and the waste polyvinyl chloride, cleaning, drying, crushing, weighing the waste bamboo products and the waste polyvinyl chloride plastics in a mass ratio of 1:2, uniformly mixing, extruding, granulating and crushing to obtain the recovered bamboo-plastic powder.
(4) Weighing the wood veneer raw materials in parts by weight for later use.
(5) Uniformly mixing polymethyl methacrylate with the polymerization degree of 1200-1500, eucalyptus powder and organic bentonite, adding 24 parts of trichloromethane, heating to 45 ℃ for reaction for 1h, adding modified polypropylene resin, recovering bamboo-plastic powder, a silane coupling agent and triphenyl phosphite, uniformly mixing, heating to 100-120 ℃ for reaction for 2-3h, adding talcum powder and benzotriazole light stabilizer UV-327 and fatty alcohol-polyoxyethylene ether sodium sulfate, melting, blending and extruding through a double-screw extruder, controlling the temperature of the extruder to be 190 ℃, placing the extruded mixture into a mold, and molding in the mold with the temperature of 170-180 ℃ for 5-10 min to obtain the high-strength polypropylene wood veneer.
Comparative example 1
The raw materials and the preparation method of the high-strength polypropylene wood veneer are the same as those in the embodiment 4, and the embodiment 4 is specifically referred. Except that the polypropylene resin was not modified in this comparative example, that is, the ordinary polypropylene resin before the modification was used, and other raw materials and preparation steps in the wood veneer were the same as those in example 4.
Comparative example 2
The raw materials and the preparation method of the high-strength polypropylene wood veneer are the same as those in the embodiment 4, and the embodiment 4 is specifically referred. Except that no organobentonite was added to the raw material of this comparative example.
Comparative example 3
The raw materials and the preparation method of the high-strength polypropylene wood veneer are the same as those in the embodiment 4, and the embodiment 4 is specifically referred. Except that polymethyl methacrylate was not added to the raw materials of this comparative example.
Comparative example 4
The invention patent CN103509360B discloses a specific example of a nano glass fiber synergistically modified reinforced wood-plastic panel, which is the present comparative example 4.
The above examples 1 to 4 and comparative examples 1 to 4 were subjected to the performance test, and the test results thereof are shown in the following tables 1 and 2.
Table 1 table of mechanical property test results of wood veneer
| Tensile strength/MPa | Flexural Strength/MPa | Elongation at break/% | Impact Strength/KJ.m-2 | |
| Example 1 | 43.1 | 59.7 | 30.2 | 17.5 |
| Example 2 | 42.8 | 60.1 | 31.4 | 16.2 |
| Example 3 | 43.5 | 62.8 | 31.9 | 18.4 |
| Example 4 | 45.9 | 64.7 | 32.1 | 18.7 |
| Comparative example 1 | 35.4 | 52.4 | 19.8 | 11.5 |
| Comparative example 2 | 39.7 | 58.4 | 28.7 | 14.2 |
| Comparative example 3 | 38.5 | 58.9 | 27.9 | 14.9 |
| Comparative example 4 | 37.5 | 55.8 | 23.4 | 12.3 |
As can be seen from the table of the wood veneer mechanical property detection results in Table 1, the polypropylene wood veneer of the invention has excellent mechanical properties. After the polypropylene resin is modified, the strength and toughness of the wood veneer are improved; after the organic bentonite is added into the polypropylene wood veneer, the strength and toughness of the wood veneer are further enhanced, and after the polymethyl methacrylate is added into the polypropylene wood veneer, the strength and toughness of the wood veneer are further enhanced.
Table 2 table of other performance test results of wood veneer
| Water absorption/%) | Flame retardancy | Resistance to freezing and thawing | |
| Example 1 | 0.11 | B1 | The bending failure load retention rate is 94.1% |
| Example 2 | 0.12 | B1 | The bending failure load retention rate is 93.4% |
| Example 3 | 0.10 | B1 | The bending failure load retention rate is 95.9% |
| Example 4 | 0.08 | B1 | The bending failure load retention rate is 97.5 percent |
| Comparative example 1 | 0.58 | B2 | The bending failure load retention rate is 85.6 percent |
| Comparative example 2 | 0.36 | B1 | The bending failure load retention rate is 90.1% |
| Comparative example 3 | 0.24 | B1 | The bending failure load retention rate is 91.9% |
| Comparative example 4 | 2.4 | B2 | The bending failure load retention rate is 87.5 percent |
As can be seen from the performance test results in Table 2, the polypropylene wood veneer of the invention has very low water absorption, good flame retardance and excellent freeze-thaw resistance. After the polypropylene resin is modified, the water absorption of the polypropylene wood veneer is reduced, the flame retardance of the polypropylene wood veneer is improved, and the freeze-thaw resistance of the polypropylene wood veneer is improved; after the organic bentonite and the polymethyl methacrylate are added into the polypropylene wood veneer, the water absorption of the polypropylene wood veneer is further reduced, and the freeze-thaw resistance of the wood veneer is improved.
The technical features of the embodiments described above can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The high-strength polypropylene wood veneer is characterized by comprising the following raw materials in parts by weight: 20-30 parts of modified polypropylene resin, 5-10 parts of polymethyl methacrylate, 20-30 parts of eucalyptus powder, 5-8 parts of organic bentonite, 27-36 parts of recycled bamboo-plastic powder, 0.5-1.0 part of silane coupling agent, 1-2 parts of talcum powder, 0.2-0.5 part of antioxidant, 0.5-1.5 parts of light stabilizer and 0.5-1.5 parts of sodium fatty alcohol-polyoxyethylene ether sulfate.
2. The high-strength polypropylene wood-veneer according to claim 1, wherein the preparation method of the modified polypropylene resin comprises the following steps: adding urea, tricresyl phosphate, BPO and ethanol into a reaction kettle, stirring for 0.5h at 40 ℃, and introducing N into the reaction kettle after uniformly mixing2Replacing air for 0.5h, slowly heating to 100-120 ℃, adding the polypropylene powder and the antioxidant 1010, and reacting for 3-4h while stirring to obtain modified polypropylene resin; the weight of the urea is 2.4% of that of the polypropylene powder, the weight of the tricresyl phosphate is 3.1% of that of the polypropylene powder, the weight of the BPO is 0.4% of that of the polypropylene powder, the weight of the antioxidant 1010 is 0.1% of that of the polypropylene powder, and the ethanol is used for dissolving the urea, the tricresyl phosphate and the BPO and is in a proper amount.
3. The high-strength polypropylene wood-based plywood as claimed in claim 1, wherein the particle size of the eucalyptus powder is 100-120 meshes.
4. The high-strength polypropylene wood-glue board according to claim 3, wherein the eucalyptus wood flour is prepared by the following method: drying and crushing trunks and leaves of eucalyptus, washing the trunks and leaves with water, drying the trunks and leaves, adding the trunks and leaves into 70% hydrochloric acid solution for hydrolysis for 30min, neutralizing the trunks and leaves with sodium hydroxide solution, washing the trunks and leaves with distilled water to be neutral, and drying the trunks and leaves to obtain the eucalyptus powder.
5. The high strength polypropylene wood veneer according to claim 1, wherein the degree of polymerization of the polymethyl methacrylate is 1200-1500.
6. The high-strength polypropylene wood-veneer according to claim 1, wherein the recycled bamboo-plastic powder is prepared from waste bamboo products and waste polyvinyl chloride plastics, and the mass ratio of the waste bamboo products to the waste polyvinyl chloride plastics is 1: (2-3).
7. The high strength polypropylene wood veneer according to claim 1, wherein the antioxidant is one of triphenyl phosphite and dodecyl acidic phosphite.
8. The high-strength polypropylene wood veneer according to claim 1, wherein the light stabilizer is one of benzophenone type light stabilizer or benzotriazole type light stabilizer.
9. The preparation method of the high-strength polypropylene wood-veneer as claimed in claims 1-8, which comprises the following steps: uniformly mixing the polymethyl methacrylate, the eucalyptus powder and the organic bentonite, adding the trichloromethane, heating to 45 ℃ for reaction for 1h, then adding the modified polypropylene resin, the recovered bamboo-plastic powder, the silane coupling agent and the antioxidant, uniformly mixing, heating to 100 ℃ and 120 ℃ for reaction for 2-3h, adding the talcum powder, the light stabilizer and the fatty alcohol-polyoxyethylene ether sodium sulfate, melting, blending and extruding through a double-screw extruder, and molding to obtain the high-strength polypropylene wood veneer.
10. The method for preparing a high-strength polypropylene wood-veneer according to claim 9, wherein the mass ratio of the trichloromethane to the polymethyl methacrylate is 3: 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108912709A (en) * | 2018-05-14 | 2018-11-30 | 广西民族大学 | A kind of polyethylene/Eucalyptus powder composite material and preparation method thereof |
| CN108948762A (en) * | 2018-04-25 | 2018-12-07 | 曾冬梅 | A kind of polypropylene fire retardant wood-plastic composite panel and preparation method |
| CN109320847A (en) * | 2018-10-17 | 2019-02-12 | 合肥月煌新型装饰材料有限公司 | A kind of furniture polypropylene base wood-plastic composite material and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108948762A (en) * | 2018-04-25 | 2018-12-07 | 曾冬梅 | A kind of polypropylene fire retardant wood-plastic composite panel and preparation method |
| CN108912709A (en) * | 2018-05-14 | 2018-11-30 | 广西民族大学 | A kind of polyethylene/Eucalyptus powder composite material and preparation method thereof |
| CN109320847A (en) * | 2018-10-17 | 2019-02-12 | 合肥月煌新型装饰材料有限公司 | A kind of furniture polypropylene base wood-plastic composite material and preparation method thereof |
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