In the development of new products, research and development institutions and wood molding enterprises have also achieved some results, giving wood-plastic composites new functions.
Wood plastic products
Micro foaming molding of plastic wood composites is one of the research hotspots. The cell density of microporous foams is 109-1015/cm 3, and the cell diameter is 0.1-10.0 Lm. The cell size of microporous foams is much smaller than that of traditional foams. These small bubbles can effectively prevent the propagation of the original crack in the material and make the crack tip blunt, so the impact strength, toughness, fatigue cycle, thermal stability and other properties have been significantly improved, and the existence of bubbles reduces the density of the material. Therefore, microporous foaming of wood fiber composites can overcome the physical and mechanical properties of defects, to a large extent, improve the performance of the material.
Plastic wood alloy
Plastics used in wood-plastic composites are mostly waste plastics, but waste plastics are difficult to accurately classify. Because of the poor compatibility between different plastics, there are also great differences in processing technology. Therefore, how to mix various waste plastics to reduce costs is a difficult problem and research hotspot in wood-plastic composites processing industry. Point.
Polymerization-reinforced wood-plastic alloy was prepared by heterogeneous miscibility technology. Two or more completely incompatible polymers were mixed to form a co-continuous phase structure, and a new type of polymer wood with high strength, high hardness and low cost was obtained. Moreover, the selection of wood and plastic materials can be extended to a wider range, and the manufacture of wood and plastic products with single component waste plastics will develop towards the use of multi-component waste plastics to form plastic alloys.
The composite made of natural flax fiber reinforced polypropylene can compete with glass fiber reinforced polypropylene and even replace PC / ABS and glass fiber reinforced PC / ABS.
Compared with glass fiber reinforced polypropylene (GFRP) and PC/ABS, Flax Reinforced Polypropylene (PP) has outstanding advantages: low density, PP containing 50% flax fiber has a density of only 1.08g/cm 3; besides impact toughness, it has good strength and rigidity, especially high bending modulus; it can be processed with the original mold on the existing injection molding machine; There is no sharp edge when impact crushing, which meets the requirements of vehicle components. It has higher heat resistance and better insulation and sound insulation characteristics. It can be recycled and is environmentally friendly material.
Development trend editor
With the industrialization of wood-plastic composite products, the application researchers found the defects of wood-plastic composite products, and the applicants put forward higher requirements: landscape outdoor products to do anti-aging, anti-decolorization, improve service life; indoor doors and windows and decorative materials to have good flame retardancy; The load-bearing Plastic-wood products of building foundations must have high mechanical properties, so it is necessary to strengthen and improve the creep resistance. With the improvement of energy-saving voice, the construction industry also put forward higher requirements for the energy-saving effect of wood-plastic composite products. Therefore, wood-plastic composite products are developing toward functionalization and high value-added direction: flame retardant, reinforced, anti-aging, anti-creep, thermal insulation and so on. In addition, the selection of wood-plastic composites is also developing towards diversification and variety, including wood flour and plastics.
In the aspect of molding technology, extrusion molding technology is the mainstream method of molding wood-plastic composite products, mainly used to develop profiles, pipes, sheets and so on. With the diversification of wood-plastic products, such as wood-plastic multi-layer composite pipes, wood-plastic micro-foamed floors, the extrusion process has put forward higher requirements, and its research and development direction is multi-layer wood-plastic co-extrusion, coating co-extrusion, steel/wood co-extrusion, plastic/wood co-extrusion and so on.
Injection molding is mainly used for wood-plastic parts and automotive parts. The new trend of its development is the development of large-scale products and engineering plastics, such as ABS wood-plastic products.
Molding method and technology is a new trend in the research and development of wood-plastic composite products, such as multi-layer and multi-station intermittent, hot extrusion and cold pressing, and continuous rolling, especially in the development of large-scale wood-plastic products such as wide-width and thick-walled panels. Molding technology can greatly improve work efficiency, reduce production costs and produce other products. Products difficult to achieve by law.
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