Pollution in the production of plastic raw materials from petroleum production
Petroleum - intermediate - polymerization monomer - resin - plastic particles - plastic products, the process of the above, each will have pollutants!
Oil separates compounds of different components by distillation. Through this process, liquefied gases (alkanes, olefins, etc.), diesel, gasoline, bitumen, etc. (from gas to solids) can be separated. In addition, plastic monomers can be prepared from naphtha or natural gas in synthetic plastics
Manufacturing process of resin is the number of small molecular materials (high molecular compound monomer, alkane, olefin, could also have liquid such as gasoline and diesel decomposed) by polymerization together into a polymer compound. The polymerization can be divided into polymerization and polycondensation according to the composition of monomer and the change of result.The reaction of monomer addition and polymerization is called polymerization. Condensation polymerization is the process of reaction, in addition to forming high polymer, but also produce water, alcohol, ammonia and other low molecular by-products. The composition of the polymer is different from that of the raw monomer. After polymerization, the polymers with large molecular weight can be obtained. Synthetic resins are polymers of high molecular weight. Resins can be divided into two categories according to their properties after heating: one is called thermoplastic resin, and the other is thermosetting resin. Thermoplastic resin after heating can soften, flow, repeatedly plasticization and molding, such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyamide; thermosetting resin is soluble and fusible before processing, but in the heating, pressurizing and curing agent under the action can become insoluble and infusible, cannot be heated again softening products to curing, phenolic resin, urea formaldehyde resin, epoxy resin, unsaturated resin belongs to this kind of resin.
