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Raw material analysis of plastic bottle cap products
2019-12-20
1. Polyethylene. The English abbreviation of polyethylene is "PE". At the time of polymerization, polyethylene is also divided into high-pressure polyethylene and low-pressure polyethylene according to different pressures. The English abbreviations are "LDPE" and "HDPE", respectively. High-pressure polyethylene has a low crystallinity, so it has a small density and a soft texture. Compared to low-pressure polyethylene, it has higher transparency, and has superior impact resistance and low temperature resistance, but it is not heat resistant. Low pressure polyethylene is more permeable than high pressure polyethylene, but it is less impact resistant than high pressure polyethylene. Both types of polyethylene are susceptible to stress and crack.
2. Polyamide. The acronym for polyamide is "PA". There are many classifications of polyamides, and the chemical structure should also be different for different synthesis, and the performance will be somewhat different, but their common points and properties are similar. Polyamide has a high crystallinity, high mechanical strength, good toughness and fatigue resistance, and it is relatively easy to color and mold, and can be used at room temperature for a long time. However, its thermal deformation temperature is low, its hygroscopicity is relatively large, and its dimensional stability is relatively poor.
3. Polyformaldehyde. POM is a highly crystalline substance and is abbreviated as "POM" in English. POM is a very elastic material. Its chemical stability, impact resistance and creep resistance are very strong, and its rigidity, strength and abrasion resistance are very high. It is a commonly used project Sexual material. However, the shrinkage rate of polyoxymethylene is high, the size control technology is very high, and the corrosion resistance is relatively low.
2. Polyamide. The acronym for polyamide is "PA". There are many classifications of polyamides, and the chemical structure should also be different for different synthesis, and the performance will be somewhat different, but their common points and properties are similar. Polyamide has a high crystallinity, high mechanical strength, good toughness and fatigue resistance, and it is relatively easy to color and mold, and can be used at room temperature for a long time. However, its thermal deformation temperature is low, its hygroscopicity is relatively large, and its dimensional stability is relatively poor.
3. Polyformaldehyde. POM is a highly crystalline substance and is abbreviated as "POM" in English. POM is a very elastic material. Its chemical stability, impact resistance and creep resistance are very strong, and its rigidity, strength and abrasion resistance are very high. It is a commonly used project Sexual material. However, the shrinkage rate of polyoxymethylene is high, the size control technology is very high, and the corrosion resistance is relatively low.
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