Plastic wood material with high hardness, bending resistance and excellent cold and heat cycle resistance and preparation method thereof

Abstract

The invention belongs to the technical field of wood-plastic materials, and particularly relates to a wood-plastic material with high hardness, excellent bending resistance and excellent cold and heat cycle resistance and a preparation method. The plastic wood material with high hardness, bending resistance and excellent cold and heat cycle resistance provided by the present invention is mainly obtained by extrusion granulation and molding from the following raw materials: wood flour, solid carboxyl acrylic resin, GMA epoxy resin Acrylic resin, epoxy reactive diluent, curing agent, polypropylene resin, polyoxymethylene resin, filler, compatibilizer, coupling agent. The beneficial effect of the present invention is that through the specific formula and process, the present invention finally obtains a wood-plastic composite material product with high hardness, excellent bending resistance, and resistance to cold and heat cycles, which can be used as a support or a board in areas with large temperature differences Use for a long time. The product of the present invention is subjected to performance test after 10 cycles of continuous cold and heat cycles according to some methods in GB / T 2411‑2008, GB / T 24508‑2009 and other standards. The product has high hardness, good flexural strength, and cold resistance. Excellent thermal cycle performance.

Description

technical field [0001] The invention belongs to the technical field of wood-plastic materials, in particular to a wood-plastic material with high hardness, bending resistance and excellent cold and heat cycle resistance, and also relates to a preparation method of the above-mentioned wood-plastic material. Background technique [0002] With the development of society and the improvement of people's quality of life, plastic-wood materials have become more and more common in outdoor applications due to their beauty and durability, such as beams in pavilions and large-span floors. However, the traditional WPC materials use ordinary wood powder, calcium carbonate fillers and polyethylene or polypropylene plastics, which have low surface indentation hardness and poor bending resistance. The phenomenon of expansion and contraction is obvious. When used as a force-bearing member such as a support member and a long-span plate, it is used in the northwest regions such as Gansu and Tu...

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Problems solved by technology

However, this product does not contain wood powder. It is not a wood-plastic product, but an all-plastic product. The bending strength and hardness of the all-plastic product depend on the strength of the thermoplastic itself. The bending strength and indentation hardness are still slightly low, and the surface is easy to It is destroyed, and the density is too large. At the same time, due to its high toughness, thermal expansion and contraction are prone to occur during the heating and cooling cycle, resulting in a significant decline in the dimensional stability and mechanical properties of the composite material after the heating and cooling cycle. Poor cycle performance; and it mainly uses thermoplastic polycarbonate plastics, which not only leads to extremely high cost of raw materials, but also requires high preparation process temperature (generally 250°C and above) and equipment conditions (mixing machine, injection molding machine), etc. Not conducive to large-scale promotion and use

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