Environmental protection significance of natural fiber reinforced composite refractories
composite refractories have become popular materials to replace steel production because of their higher strength, lower density and designability than ordinary refractories. In recent years, they have developed rapidly, especially the technology of glass fiber reinforced composite refractories has been relatively mature and has been widely used in the automotive industry. However, glass fiber is harmful to human body, and the technical parameters of wood tensile and compressive strength tester: it is easy to bond after melting, resulting in difficulties in recycling
while natural fiber is recyclable and degradable, the materials of yoga mats are almost all PVC products, which can be used and renewable. There is no toxic discharge during incineration. Filling improves the strength of core basic industries. After burial, it can be biodegradable and recycled; Natural fibers can be formed in one step, and it is easy to bond with other materials. Generally, adhesives are not used in the production process. Therefore, natural fibers are environmentally friendly materials. The advantages of natural fiber in energy saving are also very obvious, such as short growth period of hemp fiber, low requirements for growth environment, and no pesticides and fertilizers are needed in the growth process. Natural fibers consume less energy in the process of growth, harvest and processing, There is no "three wastes" pollution in the production process, and no harmful free chemical substances are separated out in the use process.
in addition, natural fiber composite refractories generally use polyester or polypropylene as the matrix resin, and wood fiber, hemp fiber and other natural fibers (straw, bamboo, sugarcane, coconut shell, etc.) It is a reinforcing material. The price of matrix resin is low, and the source of fiber raw materials is wide, but it is still relatively weak in research and development precipitation and later batch quality stability control, and the price is also very low. Therefore, natural fiber composite refractories have price advantages that other composites cannot compare. Moreover, the strength of natural fiber composite refractories is higher than that of glass fiber composite refractories. Using natural fiber composite refractories instead of glass fiber composite refractories to manufacture auto parts can achieve 5% - 15% lightweight
now, natural fiber composite refractories and products have been developed. Because the process of direct extrusion and injection molding is adopted, the composite only goes through one heating process, which can reduce the thermal degradation of heat sensitive materials such as natural fibers. Through production, automobile exterior decorative parts (including hood, spoiler and fender) are produced by extrusion molding or extrusion injection molding process
in a word, natural fiber reinforced composite refractory is a kind of environmental protection material with great development prospects. According to expert evaluation, its application will exceed that of glass fiber in five years
global glass () Department
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