Your Location：Home > News > Industry news 
Polypropylene
Category：Industry news Publish：2017-03-09 15:14:03 View：1102次
[Back]
Polypropylene is a kind of thermoplastic resin prepared by polymerization of propylene. According to the arrangement position of methyl group, three kinds of isotactic polypropylene (isotactic polypropylene), atactic polypropylene (atactic polypropylene) and syndiotactic polypropylene (syndiotactic polypropylene) were divided into two groups.
The methyl group is arranged on the same side of the molecular main chain and is called isotactic polypropylene, which is arranged randomly on the two sides of the molecular main chain in a random arrangement. In the general industrial production of polypropylene resin, the isotactic structure content is about 95%, and the rest is random or syndiotactic polypropylene. Industrial products with the main components of the same. Polypropylene also includes a copolymer of propylene with a small amount of ethylene. Usually translucent colorless solid, odorless non-toxic. Due to the high degree of crystallization and regular structure, the melting point can be as high as 167 DEG C. Heat resistance, corrosion resistance, the product can be steam disinfection is its outstanding advantages. Density is small, is the lightest general plastic. The disadvantage is that the low temperature impact resistance, easy to aging, but can be overcome by modification.
Copolymer PP material has a lower thermal deformation temperature (100 DEG C), low transparency, low gloss, low rigidity, but has a stronger impact strength, the impact strength of PP increases with the increase of ethylene content. PP VEKA softening temperature of 150 degrees C. Due to its high crystallinity, the surface stiffness and scratch resistance of the material are very good. PP does not exist the problem of environmental stress cracking.
The melt mass flow rate (MFR) of PP is usually 1~100. Low MFR PP material has better impact resistance but lower ductility. For the same MFR materials, the impact strength of the copolymer is higher than that of the homopolymer. Due to crystallization, PP shrinkage rate is very high, generally 1.6~2.0%.
The methyl group is arranged on the same side of the molecular main chain and is called isotactic polypropylene, which is arranged randomly on the two sides of the molecular main chain in a random arrangement. In the general industrial production of polypropylene resin, the isotactic structure content is about 95%, and the rest is random or syndiotactic polypropylene. Industrial products with the main components of the same. Polypropylene also includes a copolymer of propylene with a small amount of ethylene. Usually translucent colorless solid, odorless non-toxic. Due to the high degree of crystallization and regular structure, the melting point can be as high as 167 DEG C. Heat resistance, corrosion resistance, the product can be steam disinfection is its outstanding advantages. Density is small, is the lightest general plastic. The disadvantage is that the low temperature impact resistance, easy to aging, but can be overcome by modification.
Copolymer PP material has a lower thermal deformation temperature (100 DEG C), low transparency, low gloss, low rigidity, but has a stronger impact strength, the impact strength of PP increases with the increase of ethylene content. PP VEKA softening temperature of 150 degrees C. Due to its high crystallinity, the surface stiffness and scratch resistance of the material are very good. PP does not exist the problem of environmental stress cracking.
The melt mass flow rate (MFR) of PP is usually 1~100. Low MFR PP material has better impact resistance but lower ductility. For the same MFR materials, the impact strength of the copolymer is higher than that of the homopolymer. Due to crystallization, PP shrinkage rate is very high, generally 1.6~2.0%.
