the way of making pvc
The chemical method of making PVC involves taking the simplest units, called monomers, and linking these monomer molecules together in a polymerization process to form long chains of molecules called polymers (also called macromolecules).
This is PVC, its made out of vinyl chloride monomer, usually known by its initial VCM by aggregating. Some monomer in the form of reactive gas chemicals, and when direct contact with humans, some of these monomers can cause a health hazard. In these cases, they are under the strict control of production and processing, in order to protect the health, safety and environment
Polymers such as PVC, on the other hand, through the polymerization of monomer, is a solid and chemical stability of the material, so do not affect human health. VCM, the raw material for PVC, is a gas at ambient temperature, but is usually stored as a liquid under pressure. Ethylene and chlorine are the raw materials of PVC.
Through the thermal cracking of naphtha or natural gas, the basic petrochemical industry produces ethylene and propylene, among others. Naphtha is mainly supplied by the petroleum refining industry, which uses crude oil as raw material. The chlor-alkali industry uses industrial grade salt as the main raw material to produce caustic soda, chlorine and hydrogen through electrolysis.
In the first stage of the PVC production process, called ethylene and chlorine are combined to produce ethylene dichloride in the middle of the product; It is then converted to vinyl chloride, the basic building block of polyvinyl chloride or PVC. "Aggregation" process to link together to form PVC vinyl chloride molecules chain. PVC produced in this way is in the form of white powder. This is not used alone, but mixed with other ingredients to provide formulations for various products.
in summary
Most commercial plastics are made of carbon and hydrogen. PVC differs containing chlorine (about 57% of the weight) and the carbon and hydrogen. The presence of chlorine in the molecules makes PVC particularly versatile as it makes it compatible with a variety of other materials. The chlorine content also helps to make PVC flame retardant. It can also be used as a "tag" to distinguish the PVC plastic recycling automatic sorting system. PVC formulations can be shaped by various techniques and are made into final product forms using very little energy. PVC polymer is chemically stable, neutral and non-toxic. PVC formulations have a wide range of applications, including the most sensitive ones, such as medical devices, as well as construction, automotive, and cables.
