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Polyvinyl wood-plastic composite and method for preparing same

A wood-plastic composite material and polyethylene-based technology, which is applied in the field of plastic composite modification and processing, can solve the problems that wood fibers cannot be uniformly dispersed, increase the technological process, and aggregate, and achieve the effects of low preparation cost and broad application prospects.

Inactive Publication Date: 2010-06-23
SHANGHAI BESTON PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it is well known that there are a large number of polar groups on the surface of wood fibers. During the preparation of wood-plastic composites, there is a relatively large interfacial energy difference between hydrophilic wood fibers and hydrophobic polymers, and it is difficult to fully integrate the two interfaces. , and there are a large number of hydroxyl groups on the surface of wood fibers, which are easy to form hydrogen bonds and lead to aggregation, so that the wood fibers cannot be uniformly dispersed in the polymer, and the aggregates of these wood fibers are prone to stress concentration under the action of external forces, making the product The physical and mechanical properties of the material are greatly reduced, which limits the development of the material and prevents it from being widely used.
Therefore, also progressively develop at the compatibility research of wood fiber and thermoplastics, as modifying wood flour (CN02157950.4; CN200510060794.1) with coupling agent, but performance is not ideal enough; Graft maleic anhydride with polyolefin, Ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer (CN200410077610.8; CN02160123.2), ionomer (CN200610005590.2) and polyolefin grafted silane as modifier (CN02125652.7), need to be Prepare the modifier, or increase the cost or increase the process flow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a) Infrared drying the wood fiber powder with a particle size of 80 to 100 mesh until the moisture content of the wood fiber powder is ≤1.0%;

[0032] b) Add 100 parts by weight of dried wood fiber powder to a high-speed mixer and mix at a high speed to 85°C (depending on the friction between the material and the stirring paddle and the pot wall to heat up, the speed of the high-speed mixer is: 1470r / min), and then add 1 part by weight of stearic acid, mixed at high speed to 115°C;

[0033] C) with the waste and old polyethylene plastics of 20 weight parts, the coupling agent-maleic anhydride graft high-density polyethylene of 3 weight parts, the lubricant of 4 weight parts (by 2 weight parts calcium stearate and 2 weight parts poly ethylene wax mixture), 0.1 parts by weight of anti-ultraviolet agent, and 1 part by weight of coloring agent are added into the high mixer to make the system mix evenly;

[0034] d) Add the above-mentioned uniformly mixed materials into a p...

Embodiment 2

[0037] a) Infrared drying the wood fiber powder with a particle size of 80 to 100 mesh until the moisture content of the wood fiber powder is ≤1.0%;

[0038] b) Add 100 parts by weight of dried wood fiber powder to a high-speed mixer and mix at a high speed to 85°C (depending on the friction between the material and the stirring paddle and the pot wall to heat up, the speed of the high-speed mixer is: 1470r / min), and then add 2 parts by weight of stearic acid, mixed at high speed to 115°C;

[0039] C) the waste and old polyethylene plastics of 25 weight parts, the coupling agent-maleic anhydride graft high-density polyethylene of 4.5 weight parts, the lubricant of 8 weight parts (by 2 weight parts calcium stearate and 6 weight parts poly ethylene wax mixture), 0.5 parts by weight of anti-ultraviolet agent, and 2 parts by weight of coloring agent are added into the high mixer to make the system mix evenly;

[0040] d) Add the above-mentioned uniformly mixed materials into a pa...

Embodiment 3

[0043] a) Infrared drying the wood fiber powder with a particle size of 80 to 100 mesh until the moisture content of the wood fiber powder is ≤1.0%;

[0044] b) Add 100 parts by weight of dried wood fiber powder to a high-speed mixer and mix at a high speed to 85°C (depending on the friction between the material and the stirring paddle and the pot wall to heat up, the speed of the high-speed mixer is: 1470r / min), and then add 3 parts by weight of stearic acid, mixed at high speed to 115°C;

[0045] C) with the waste and old polyethylene plastics of 30 weight parts, the coupling agent-maleic anhydride graft high-density polyethylene of 6 weight parts, the lubricant of 10 weight parts (by 6 weight parts calcium stearate and 4 weight parts poly Ethylene wax mixed composition), 1 weight part of anti-ultraviolet agent, 3 weight parts of coloring agent are added in the high mixer, and the system is mixed evenly;

[0046] d) Add the above-mentioned uniformly mixed materials into a p...

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Abstract

The invention discloses polyvinyl wood-plastic composite which comprises the following components: 100 portions of wood fiber powder, 1-3 portions of stearic acid, 20-30 portions of waste polyethylene plastic, 3-6 portions of coupling agent, 4-10 portions of lubricant, 0.1-1 portion of ultraviolet resistant agent and 1-3 portions of coloring agent. The surface of the wood fiber powder is preliminarily modified by the stearic acid so that a dense hydrophobic thin film is formed on the surface of wood fiber to ensure that the wood fiber is more compatible with the polyethylene polymer, the dispersion of the wood fiber in the polyethylene polymer is promoted, the polyvinyl wood-plastic composite has excellent comprehensive performance and good processing performance, and the product made from the polyvinyl wood-plastic composite is superior to the domestic similar product in appearance quality and physiochemical performance. In addition, the formula of the polyvinyl wood-plastic composite is more environmental-friendly than the prior art, the cost spent in preparing the polyvinyl wood-plastic composite is lower, and the polyvinyl wood-plastic composite is suitable for industrial production, meets the market demand and has broad application prospect.

Description

technical field [0001] The invention relates to a polyethylene (PE)-based wood-plastic composite material and a preparation method thereof, belonging to the technical field of plastic composite modification processing. Background technique [0002] PE-based wood-plastic composite material is a new modified and environmentally friendly material that uses waste wood powder, rice husk, straw and other natural fibers to fill and reinforce PE plastics. It has both the cost and performance advantages of natural fibers and PE plastics, and can be widely used in Manufacture various wood-plastic composite trays, military sleepers, garden guardrails, indoor and outdoor floors and other products, which is one of the main varieties of wood-plastic composite products currently produced in China. The development of this material alleviates the shortage of resources and energy caused by the increasing demand for petroleum resources, wood and forest products. It is an effective means to pro...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08L23/06C08K5/09B29B9/06B29C47/00B29C47/92B29C48/04B29C48/06B29C48/625B29C48/92
CPCB29C48/92B29C2948/92704B29C48/04B29C48/06B29C48/625B29C48/9185B29C2948/92514B29C2948/9259B29C2948/92828B29C2948/92866B29C2948/92885B29C2948/92895
Inventor 陈恒财刘小波朱子东郑义红
Owner SHANGHAI BESTON PLASTICS
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