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Modified reinforced plastic wood composites are the future development direction
With the maturity and progress of fiber manufacturing technology, high-modulus and high-strength fibers such as carbon fiber, aramid fiber, and silicon carbide are gradually used as a reinforcing phase to be added to the resin matrix to make composite materials, with significant reinforcement effects. Similarly, adding fibers to the plastic wood composite material to prepare a multi-element composite material composed of thermoplastics, wood flour and fiber can greatly improve the strength of the plastic wood composite material. With the rapid development of material science, more and more types of fibers are used to reinforce composite materials, such as glass fiber, carbon fiber, basalt fiber, mineral wool, polyester fiber, etc.; natural cellulose fiber has advantages in environmental protection and pollution-free in the past ten years, it has also been increasingly used to reinforce polymer materials. These fibers can be used to improve the mechanical properties of plastic wood composites.
Plastic wood composite materials are developing rapidly with their unique environmental advantages, and the next step is bound to develop in the direction of high efficiency, high performance and high quality. It is an effective method to increase the strength of plastic wood composites by adding reinforcing fibers, especially to improve the impact resistance of plastic wood composites, which is of great significance for expanding the application of plastic wood composites.
However, fiber reinforced plastic wood composites need to solve the following problems:
1) Further improve production efficiency. As far as ordinary plastic wood composite materials are concerned, the current extrusion production efficiency is generally low. The improvement of production efficiency can start from the stability of materials, optimization of formula, improvement of equipment and improvement of process level, among which the most important is The improvement of extrusion equipment and technology, the realization of high-efficiency plasticization, low-temperature extrusion, precise shaping and effective cooling are the keys to improving extrusion production efficiency. For fiber-reinforced high-performance, high-quality plastic wood products, it is imperative to realize rapid industrialization and increase production efficiency.
2) Develop special equipment for fiber reinforced plastic wood composite materials. Fibers are not easy to be uniformly dispersed in the matrix and tend to agglomerate, and too violent dispersion and shearing will also cause most of the fibers to break, especially for softer, flexible fibers. These problems are more obvious. To solve these technical problems, it is necessary to improve the existing equipment. For example, in the mixing equipment, special screws can be considered for the melt of plastic wood composite materials with high viscosity characteristics, which can achieve the effect of fiber dispersion without affecting the fibers. Produces excessive shear.
3) Develop continuous fiber reinforced plastic wood composite material technology. Continuous fiber has been widely used in reinforced polymer composites, and there are many molding methods that can be used, such as pultrusion, injection molding, winding, dipping and hot pressing, etc. The reinforcement effect is obviously better than chopped cut fiber. Plastic wood composites have little research on continuous fiber reinforcement at present, and mature reinforcement technology has not been formed. The difficulty still lies in the low fluidity of plastic wood composites and the limitations of molding processing.
4) Exploit the market of high-performance plastic wood composite materials. Most of the plastic wood composite materials currently presented to the public are decorative materials with low added value and low performance, such as outdoor decking, pavilions, fences, exterior wall hanging panels, indoor hanging sheds and interior wall decorative panels, etc. Higher value-added car seats, interiors, doors and windows, furniture and other plastic wood composite materials that require higher strength or impact resistance. The development of these market areas will increase the demand for high-performance plastic wood composite materials, and then drive the industrial development of fiber-reinforced plastic wood composite materials.