Co-extrusion formed wood-plastic composite plate and preparation method thereof

Abstract

The invention discloses a co-extrusion formed wood-plastic composite plate and a preparation method thereof, which discloses a composite material, a structural material and the preparation method of the materials. The co-extrusion formed wood-plastic composite plate is composed of an anti-aging resin layer and a wood-plastic structural layer, wherein the anti-aging resin layer is located on the surface of the wood-plastic structural layer. The anti-aging resin layer is formed by melting, blending and extruding an ASA (Acrylonitile-Styrene-Acrylate) resin, titanium dioxide, an antioxidant and a light stabilizer; and the wood-plastic structural layer is formed by extruding polyethylene, wood power, calcium powder, a rare-earth coupling agent, chlorinated polyethylene, acrylic resin, polyethylene wax, octyl stearate and ethylene bis stearamide. Different molten material flows are formed by the anti-aging resin layer and the wood-plastic structural layer, and then the material flows are converged in a compound machine head and co-extruded by a neck mould, so that the co-extrusion formed wood-plastic composite plate is prepared. Besides the characteristics of multiple purposes of common wood-plastic plates, the wood-plastic plate has more excellent anti-aging property and does not age after a long use in the open air. The co-extrusion formed wood-plastic composite plate disclosed by the invention is suitable for preparing indoor and outdoor floors, guardrails, decorative sheets and the like.

Description

technical field [0001] The invention relates to a co-extruded plastic-wood composite material board and a preparation method thereof, which relate to a composite material, a structural material and a preparation method thereof, and are suitable for making indoor and outdoor floors, guardrails, decorative boards, and the like. Background technique [0002] Wood-plastic composite material is a composite material made of plastic and wood fiber (or natural fiber such as rice husk, wheat straw, corn stalk, peanut shell, etc.) with a small amount of chemical additives and fillers, and processed by special compounding equipment. It has both the main characteristics of plastic and wood, and can replace plastic and wood in many occasions. It has high strength and hardness, is not easy to wear, acid and alkali resistant, does not deform, does not contain formaldehyde, and is easy to recycle. It can be made into various cross-sections. Shape and size, different colors can be manufactur...

AI Technical Summary

Problems solved by technology

But even so, there are some obvious deficiencies in the use of wood-plastic composite materials. For example, most of the wood-plastic composite materials currently on the market directly mix anti-aging agents such as antioxidants with wood powder and polyolefin, and then extrude them to prepare plastic wood composite materials. As a result of this, the wood composite material board often leads to a low proportion of anti-aging agents such as antioxidants in the wood-plastic composite material. During use, it cannot resist aging well, resulting in surface discoloration and cracking, which affects both Its appearance will also shorten its service life, thereby limiting its scope of use; if the amount of anti-aging agent is increased, on the one hand, it may affect other properties of plastic-wood composite materials, and at the same time, it will also increase the price of plastic-wood products. improve

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