In addition to dirt and strong, its performance is better than dyeing nylon, can usually disperse dyeing and printing, without the use of special chemicals, propylene glycol, dyeing having dry, crisp and so on. According to Shell (Shell) predicts that by 2015 the world's PTT fiber demand will sell more than 2 million t of propylene glycol, and has broad application prospects, is the development of new varieties of synthetic hot. PTT fiber development, suggesting demand for basic materials synthesis of propylene glycol great, if all alternative PPT PET and other synthetic annually in China alone needs 1 million t of propylene glycol propylene glycol chemicals, so China has already propylene production technology development as national "fifteen" scientific and technological items glycol: the physical properties of unsaturated polyester resins edit the relative density of about 1.11 to 1.20, a large volume shrinkage during curing produce propylene glycol, some of the physical properties of the cured resin is as follows: ⑴ heat resistance. The vast majority of the unsaturated polyester resin has a heat distortion temperature in 50 ~ 60 ℃, some heat-resistant resin is up to 120 ℃. Red is the thermal expansion coefficient α1 (130 ~ 150) × 10-6 ℃. ⑵ mechanical properties. Unsaturated polyester resin having a high tensile, bending, compression strength. ⑶ chemical resistance. Unsaturated polyester resin water, dilute acid, dilute alkali better performance, performance is poor resistance to organic solvents, while chemical resistance with their different chemical structure and geometry of the switch, can be very different resins. ⑷ dielectric properties. Unsaturated polyester resin acids good dielectric properties. Production of propylene glycol | Zhangjiagang glycol | Wei Wei Connaught Chemical provided by Qingdao Sino Chemical Co. Qingdao Wei Connaught Chemical Co. (www.qdweinuo.com) strong, credible, in Qingdao, Shandong and other chemical products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Wei Connaught Chemical and you hand into the brilliant, for a better future!