Pp non-woven raw materials explain
The methyl group is called isotactic polypropylene on the same side of the main chain of the molecule. If the methyl group is disordered, it is called atactic polypropylene on both sides of the main chain of the molecule. When the methyl groups are alternately listed on the sides of the main chain of the molecule, Gauge polypropylene. In the polypropylene resin produced by individual property, the isotactic structure content is about 95%, and the rest is random or syndiotactic polypropylene. Property products are based on isotactics. Polypropylene also includes a copolymer of propylene and a small amount of ethylene. Anything that is translucent and colorless, odorless and non-toxic. The melting point can be as high as 167 ° C due to the high degree of crystallisation due to structural regularity. Heat-resistant, corrosion-resistant, steam-sterilizable products are its outstanding benefits. The low density is the lightest general purpose plastic. The shortcomings are poor resistance to low temperature impact and easy to age, but can be overcome by process modification.
The copolymer type PP material has a lower heat distortion temperature (100 ° C), low transparency, low gloss, low rigidity, but has stronger impact strength, and the impact strength of PP increases as the ethylene content increases. . The Vicat softening temperature of PP is 150 °C. Due to the high degree of crystallinity, such materials have excellent profile stiffness and scratch resistance. PP does not have the problem of scene stress cracking.
The melt quality of PP (MFR) is usually between 1 and 100. Low MFR PP materials have better impact resistance but lower elongation. For materials with no different MFR, the impact strength of the copolymer type is higher than that of the homopolymer type. Due to crystallization, the shortening rate of PP is quite high, which is 1.6 to 2.0%.
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