we talking about PVC lots of time,incuding what is PVC,what is use of PVC? Let us know what the raw materials of PVC are today.

Polyvinyl Chloride (PVC) is a thermoplastic material that is used in a myriad of products including water pipe and electrical conduit. It is a polymer whose long chain molecules are made from the building blocks of vinyl chloride. Additives are used to enhance the properties of PVC for specific applications. Finished products come in a number of colors, are tolerant to ultraviolet light, and have various degrees of flexibility.

Raw Materials

The two raw materials used in the manufacture of PVC are sea water and oil. Salt derived from sea water is used to make chlorine gas and petroleum oil is the original source for ethylene gas. Chlorine and ethylene are the two main ingredients needed to make PVC.

Chlorine

Chlorine is produced from a saline solution by the process of electrolysis. A solution of sodium chlorine, or common table salt, is placed in a container with electrodes. When electric current is applied, the positive electrode attracts chloride ions in the solution where they combine to form chlorine gas.

Ethylene

Ethylene is a colorless and odorless gas with the chemical formula C2H4. It is highly flammable and can cause explosions if mishandled. It is produced commercially from the refining of petroleum.

Making PVC granules

The chlorine and ethylene gases are combined to produce ethylene dichloride which is converted at high temperatures to vinyl chloride (CH2=CHCl). The vinyl chloride molecules are then polymerized to form the PVC resin. Other compounds are added to improve its appearance and physical and chemical properties. The first stage of the manufacturing of PVC granules consists of the creation of long tubes of material made through a special extrusion plant. The next step consists of cutting the plastic in really small beads. The process is actually really simple, but it is extremely important to use caution when handling the material, taking fundamental precautions that may make it more complicated.Based on its characteristics and its dangerousness, PVC granules have to be produced in specialized plants. JIAHONG has a production line solely dedicated to this plastic material.

Additives

A number of compounds can be added to raw PVC. The most common additives are pigments to add color, UV inhibitors to protect the material from being degraded by prolonged exposure to sunlight, and plasticizers to adjust the degree of flexibility of the specific product. Most plasticizers come from a chemical group called phthalates.

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