Polypropylene ethylene has many excellent properties that other general synthetic rubbers do not have. In addition, the monomer is cheap and easy to obtain and has a wide range of uses. It is the fastest developing one of the seven major synthetic rubber varieties abroad since the 1980s. Its output, production capacity and consumption rank third in developed countries, second only to styrene butadiene rubber and CIS butadiene rubber. In 1998, the total production capacity of EPR in the world was

Dihydroxyethyl terephthalate was synthesized by transesterification of dimethyl terephthalate with ethylene glycol or esterification of purified terephthalic acid with ethylene glycol, and then polycondensation. Pet is divided into fiber grade polyester chips and non fiber grade polyester chips. ① Fiber grade polyester is used to manufacture polyester staple fiber and polyester filament. It is the raw material for polyester fiber enterprises to process fiber and related products. ② Non fiber gra

The intrinsic viscosity of general fiber grade polyester chips is 0.645. The intrinsic viscosity mentioned here is used to characterize the molecular weight of polyester in industry. Measuring the intrinsic viscosity can not only correctly evaluate the quality of polyester, but also provide an important basis for formulating spinning process conditions. When the intrinsic viscosity of polyester chip is too low, the molecular weight of polyester is small, the spinning process is difficult to stre