Because the plastic shell of air conditioner is ABS plastic, it will turn yellow after a long time. The yellowing of plastic shell of air conditioner is the basic phenomenon of long-term use and aging. There is no way to turn white, because this yellowing has entered the inside, and a layer of sandpaper will be worn off outside, and then it will become whiter after polishing.
ABS plastic has the same characteristics as these three components. A makes it resistant to chemical corrosion and heat and has a certain surface hardness. B makes it have high elasticity and toughness. S makes it have the processing and molding characteristics of thermoplastic and improves its electrical properties. Therefore, ABS plastic is a kind of "tough, hard and rigid" material, with easily available raw materials, good comprehensive performance, low price and wide application.
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Precautions for using ABS plastics:
1, startup and shutdown In order to prevent the decomposition of flame retardant, there are strict requirements for flame retardant ABS. Before starting _, clean the cylinder with general ABS before machining.
2. Before stopping (those who stop for more than 20 minutes), on the one hand, the temperature in the cylinder must be reduced to below 100℃, on the other hand, the materials in the cylinder must be emptied and cleaned with general ABS before stopping. Its purpose is to make the flame retardant ABS not decompose.
3. Utilization of recycled materials For the primary or secondary ABS recycled materials that are clean, free of impurities and decomposition products, they can be directly used after being crushed, or mixed with new materials, and the mixing ratio generally does not exceed 25% of the new materials, so as not to affect the performance.
4. Recycled materials that have been regenerated for more than 5 times or added with colorants are generally not mixed with new materials, mainly to prevent color difference. Whether it is a single recycled material or a recycled material mixed with new materials, it must be dried according to regulations before it can be put into molding.