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The functional trend of foamed plastic wood composites
Foamed plastic wood composite material is an environmentally friendly material with a wide range of materials (both recycled secondary fibers and waste plastics), low manufacturing cost, and it can be recycled and reused many times, reducing the amount of plastic used and reducing in addition to environmental pollution, it is also beneficial to protect forest resources. Foamed plastic wood composites, because they combine the strengths of wood and plastic, still have advantages in performance, such as higher strength, better water resistance, lower price, and wider application range. In recent years, plastic wood composite micro-foaming technology has also been greatly developed, especially for PVC-based manufacturers. In order to meet product performance requirements, develop new processing techniques, introduce foaming technology, reduce material costs, and expand the scope of use of WPC . Foamed plastic wood composite materials can be used as light and high-strength parts required by the automotive industry, sports equipment, packaging, and heat preservation and heat insulation materials in the construction industry, etc., and shine in the application field.
At present, the research of foamed plastic wood composites has made significant progress and obtained a series of important research results, which promote the sustainable development of the plastic wood composites industry. Foamed plastic wood composite materials have the advantages of low cost, light weight, high strength, heat insulation and sound absorption. The market demand and application fields will become larger and larger, but the existing products are difficult to meet the needs, so it is necessary to carry out in-depth product design and process realization research to realize the industrialization of foamed plastic wood composite materials. Future research trends will focus on the following aspects.
Development of new foaming technology
It overcomes the inherent defects of plastic wood composite materials and improves material performance, but the foam cell structure of the currently prepared foam material is not ideal. New foaming processes such as supercritical fluid injection molding will be the focus of future research.
Improve the interface compatibility of plastic wood composites. For plastic wood composites, interface compatibility is an important factor restricting the application of materials. In foamed plastic wood composites, the existence of cells weakens the relationship between plastic and fibern connection. Although the currently used coupling agents have a certain effect on improving the interface compatibility, there is still room for improvement in this regard.
Development of functional materials
In order to expand the application range of foam-plastic wood composite materials, the development of materials with functions such as sound insulation, heat insulation, anti-corrosion and flame retardant, aging resistance, and creep resistance is the next step in research and development.
Increase fiber content
As a renewable resource, biomass fiber is more energy-saving, environmentally friendly and cheaper than plastics. Increasing the fiber component of the foamed plastic wood composite material can not only reduce the cost, but also speed up the degradation of the material. However, increasing the amount of fiber will definitely make foaming more difficult, and some properties of the material will also decrease. Therefore, the increase of fiber content will be the direction of future research.
With the increasing scarcity of resources, people’s demand for plastic wood composites will inevitably increase. This also puts forward higher requirements on the preparation technology of plastic wood composites. The future foamed plastic wood composites will also move towards Product functional and diversified direction development.
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