1.PP resin is polypropylene resin.
2.PP Polypropylene Chemical and Physical Properties PP is a semi-crystalline material. It is harder than PE and has a higher melting point. Since the homopolymer type of PP is very brittle at temperatures above 0C, many commercial PP materials are irregular **** polymers with 1-4% ethylene or higher ratio ethylene content of clamped **** polymers. The *** polymer type of PP material has a lower heat distortion temperature (100C), low transparency, low gloss, and low rigidity, but has greater impact strength.The strength of PP increases as the ethylene content increases. PP has a Vicat softening temperature of 150 C. Because of its high crystallinity, this material has good surface stiffness and scratch resistance properties.
3. PP does not suffer from environmental stress cracking. Typically, PP is modified by adding glass fibers, metal additives, or thermoplastic rubber.The flow rate MFR of PP ranges from 1 to 40.PP materials with low MFR have better impact resistance characteristics but lower ductile strength. For the same MFR, the *** polymer type is stronger than the homopolymer type. Due to crystallization, the shrinkage of PP is quite high, generally 1.8 to 2.5%. And the directional uniformity of shrinkage is much better than materials such as PE-HD. Adding 30% glass additive can reduce the shrinkage to 0.7%. Both homopolymer-type and *** polymer-type PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and solubility. However, it is not resistant to aromatic hydrocarbon (e.g., benzene) solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents, and the like.
Expansion:
1. Polypropylene is a thermoplastic polymer (thermoplastic: refers to a material that can be melted when heated after cooling there can be hardened and can be repeated; polymer: refers to the natural or synthetic compounds, whose molecules are large molecules repeatedly linked by a series of simple monomer small children), is very wide range of applications, and even Australia's banknotes are made of PP. PP has an unusual resistance to chemical solvents, acids and alkalis.?
2. It can make high purity PP, which is used in the semiconductor industry. It is also resistant to bacterial production and is suitable for use as disposable syringes and medical devices. It can be used for injection molding or machining and welding. It can be used for pipes, filter materials, horn cylinders and other plastic products with higher quality requirements than polyethylene products. The bill is made of biaxially oriented polypropylene (BOPP) so that its durability is increased.?
3. Polypropylene was discovered by Italian chemist Giulio Natta in the early 1950s. In modern science, the invention of a thing may be invented by people in different locations at the same time. Polypropylene is such an extreme example, having been invented independently about nine times. It was the kind of drama that patent attorneys dream of, and the litigation didn't end until 1989.
4. Polypropylene has tried to continue the legal drama, with two American chemists, J. Paul Hogan and Robert Banks, who worked for Phillips Petroleum, now considered the "official" inventors of the material. Like its cousin polyethylene, polypropylene is cheap and plentiful. The products range from plastic bottles to carpeting, plastic furniture, and are used in large quantities in the automotive industry.