Views: 235 Author: TH Publish Time: 2018-11-07 Origin: Site
Polypropylene is a semi-crystalline thermoplastics.
It has high impact resistance, strong mechanical properties and toughness, resistance to a variety of organic solvents and acid and alkali corrosion.
It has been widely used in industry and is one of the common polymer materials.
Australian COINS are also made of polypropylene.
Mainly used in the production of various long and short polypropylene fiber, polypropylene woven bag, packaging bag, injection molding products and other products for the production of electrical appliances, telecommunications, lighting, lighting equipment and television flame retardant parts
Main application:
The eastern standard testing center indicates that there is no environmental stress cracking problem in PP.
PP is usually modified by adding glass fiber, metal additives or thermoplastic rubber.
The flow rate of PP MFR ranges from 1 to 40.
PP materials with low MFR have better impact resistance but lower tensile strength.
For materials with the same MFR, the strength of copolymer type is higher than that of homopolymer type.
Due to crystallization, PP shrinkage rate is quite high, generally 1.8~2.5%.
And the direction uniformity of shrinkage rate is much better than that of pe-hd and other materials.
Adding 30% glass additives reduced the shrinkage to 0.7%.
PP materials of homopolymer type and copolymer type have excellent moisture absorption resistance, acid and alkali corrosion resistance and solubility resistance.
However, it is not resistant to aromatic hydrocarbon (such as benzene) solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents and so on.
