The basic structure, molding function characteristics and preparation method of polypropylene PP.
Polypropylene (PP) is tasteless, non-toxic Milky White granular products or powder products, the relative density of 0.90~0.91. Melting point 164~167 ℃. Has excellent mechanical properties, heat resistance, electrical insulation properties, chemical stability, and most chemicals do not occur. However, the light resistance is poor, easy to age, low temperature impact strength is poor, poor dyeing, need to be improved by adding additives, blending, copolymerization and other methods. Insoluble in water, do not absorb water, can be boiled in water, at 130 ℃ disinfection, easy processing molding.
2021/11/12
Grade 1~7 of plastic products, which level is the safest?
Use: heat resistant to 70 ℃, only suitable for warm or frozen drinks, high temperature liquid, or heating is easy to deformation, there are harmful substances melt out. Moreover, scientists found that after 10 months of use, the No. 1 plastic may release the carcinogen DEHP, which is toxic to the testes.
2021/11/09
The characteristics of each material are different, coupled with the development of material modification technology, it is difficult to make such a distinction, look at the following differences between different materials to know the characteristics of its material.
2021/11/09
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