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PVC wood plastic composites (WPC) and preparation method thereof

A technology of wood-plastic composite materials and mixtures, applied in the direction of coating, etc., can solve the problems of the decline of mechanical properties of wood-plastic composite materials, the influence of mechanical properties of wood-plastic composite materials, and the limitation of the development of wood-plastic composite materials, and achieve ultraviolet and oxygen stability , Excellent weather resistance, strong anti-aging performance

Inactive Publication Date: 2018-05-15
广西南宁桂尔创环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the wood powder and plastics that make up wood-plastic composite materials are flammable materials, places with high fire resistance have certain requirements for wood-plastic composite materials. Most wood-plastic composite materials are improved by adding flame retardants. Flame retardant properties, but there are some problems, such as the generation of pollutants in the combustion process or a large amount of filling, which is uneconomical and increases costs, and at the same time affects the mechanical properties of wood-plastic composites
There are a large number of active hydroxyl groups on the surface of lignocellulose, so the binding ability with the lipophilic resin interface is weak, which makes wood-plastic composites easier to absorb moisture than plastic products, and at the same time causes the mechanical properties of wood-plastic composites to decline
In addition, thermoplastic resin is used as the matrix resin in wood-plastic composite materials, which has problems such as high brittleness and low strength, and cannot be used as a load-bearing material.
The above problems limit the development of wood-plastic composite materials

Method used

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  • PVC wood plastic composites (WPC) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of mixed gel solution: Mix 2.5 parts of KH-560, 14 parts of water and 5.5 parts of absolute ethanol, stir magnetically for 15 minutes under the conditions of pH=5 and 45°C, then add 23 parts of acidic silica sol, and react for 1 hour to obtain the improved gel solution. Slowly add 23 parts of polytetrafluoroethylene emulsion to the above sol system dropwise, add dimethylformamide and adjust the mixed emulsion to pH = 5 with acid; after reacting for 2.5h, age at a constant temperature of 30°C 24h, obtain mixed gel solution;

[0039] Plant fiber powder modification: Take 62 parts of plant fiber powder, add 1 part of coupling agent, and pre-mix in a high-speed mixer for 30 minutes;

[0040] High-speed mixing of materials: Weigh 5.2 parts of glass fiber, 9 parts of unsaturated polyester resin, 15 parts of polydimethylsiloxane, 5 parts of epoxy octyl stearate, 12 parts of chlorinated paraffin, 8 parts of N-formaldehyde Base pyrrolidone, 3 parts of oleic acid ami...

Embodiment 2

[0045] Preparation of mixed gel solution: Mix 2 parts of KH-560, 10 parts of water and 5 parts of absolute ethanol, stir magnetically for 15 minutes under the conditions of pH=5 and 45°C, then add 24 parts of acidic silica sol, and react for 1 hour to obtain the modified gel. Slowly add 24 parts of polytetrafluoroethylene emulsion to the above sol system dropwise, add dimethylformamide and adjust the mixed emulsion to pH = 5 with acid; after reacting for 2.5h, age at a constant temperature of 30°C 24h, obtain mixed gel solution;

[0046] Plant fiber powder modification: Take 60 parts of plant fiber powder, add 2 parts of coupling agent, and pre-mix in a high-speed mixer for 40 minutes;

[0047] High-speed mixing of materials: Weigh 5 parts of glass fiber, 10 parts of unsaturated polyester resin, 12 parts of polydimethylsiloxane, 3 parts of epoxy octyl stearate, 13 parts of chlorinated paraffin, 6 parts of N-formaldehyde Base pyrrolidone, 2 parts of oleic acid amide, 2.5 parts...

Embodiment 3

[0052] Preparation of mixed gel solution: Mix 3 parts of KH-560, 11 parts of water and 6 parts of absolute ethanol, stir magnetically for 15 minutes under the conditions of pH=5 and 45°C, then add 22 parts of acidic silica sol, and react for 1 hour to obtain the modified gel. Slowly add 22 parts of polytetrafluoroethylene emulsion into the above sol system dropwise, add dimethylformamide and adjust the mixed emulsion to pH = 5 with acid; after reacting for 2.5h, age at a constant temperature of 30°C 24h, obtain mixed gel solution;

[0053] Plant fiber powder modification: Take 70 parts of plant fiber powder, add 3 parts of coupling agent, and pre-mix in a high-speed mixer for 60 minutes;

[0054] High-speed mixing of materials: Weigh 5.8 parts of glass fiber, 6 parts of unsaturated polyester resin, 10 parts of polydimethylsiloxane, 6 parts of epoxy octyl stearate, 10 parts of chlorinated paraffin, 7 parts of N-formaldehyde Base pyrrolidone, 2.5 parts of oleic acid amide, 3 pa...

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Abstract

The invention belongs to the technical field of processing for composites, and particularly relates to PVC WPC and a preparation method of PVC WPC. PVC WPC comprises the following components in partsby weight: 50 to 60 parts of PVC, 60 to 70 parts of a plant fiber powder, 5 to 6 parts of glass fibers, 5 to 10 parts of unsaturated polyester resin, 10 to 15 parts of polydimethylsiloxane, 3 to 6 parts of epoxy stearic acid octyl ester, 10 to 15 parts of chlorinated paraffin, 6 to 8 parts of N-methyl pyrrolidone, 2 to 3 parts of oleic acid amide, 1 to 4 parts of a coupling agent, 2 to 3 parts ofan initiator, 2 to 11 parts of an ultraviolet absorbent, and an appropriate amount of a mixed gel solution. The preparation method comprises the following steps: firstly, modifying the plant fiber powder, then mixing with other materials at a high speed, performing plastication and hot-press molding, then impregnating and drawing a coating film to obtain PVC WPC. PVC WPC disclosed by the inventionhas high strength, good stability, strong aging resistance and long service life.

Description

technical field [0001] The invention belongs to the technical field of composite material processing, in particular to a PVC wood-plastic composite material and a preparation method thereof. Background technique [0002] Wood plastic composites (wood plastic composites, WPC) referred to as "wood plastic", refers to thermoplastics such as polyethylene (PE), polypropylene (PP) or polyvinyl chloride (PVC) and wood powder, bamboo powder, straw powder It is a composite material formed by melting and blending biomass fiber materials such as shell powder and shell powder. It is a material that can be recycled, is green and environmentally friendly, and has both the excellent properties of wood and plastic, and can be prepared by extrusion, pressing, or injection molding. Wood-plastic composite materials can be sawed, drilled, bonded, fixed with nails or screws, easy to fix, and also have good waterproof, anti-corrosion, aging resistance, dimensional stability and good mechanical p...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08L97/02C08L67/06C08L83/04C08L91/06C08K13/04C08K7/14C08K5/1515C08K5/20C08J7/04C09D127/18C09D7/62
Inventor 戚海冰
Owner 广西南宁桂尔创环保科技有限公司
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