How Is PVC Made
PVC (polyvinyl chloride) is used in thousands of different applications. If you ask someone how PVC is made, you will probably be met with a blank stare.Here let's help you to understand how it is made.
Vinyl compound is found in every facet of our daily lives. It is a versatile workhorse material that can be used when making everything from medical tubing to backyard decking to power cable jackets. If you look around you right now, you will find countless objects that have some PVC component.
Curious about how PVC is made?
The first step is separating ethylene out of the oil feedstock.
Ethylene, a natural gas derivative, is supplied by the petrochemical industry. It is captured during a process called thermal cracking. Liquid petroleum is heated in steam furnaces and put under extreme pressure. This creates changes in the molecular weight of the chemicals found in petroleum feedstock. Changing the molecular weight allows ethylene to be identified, segmented and captured. It is then cooled back down to a liquid state.
The other step is extracting chlorine from sea salt.
Chlorine, which is found in salt extracted from sea water, gains an additional electron during the process of electrolysis. By sending a strong current of electricity through salt water solution – strong enough to change its molecular structure – chlorine is
separated, then extracted from the mixture.
When ethylene and chlorine are reacted, ethylene dichloride (EDC) is created. This passes through another thermal cracking process, which produces vinyl chloride monomer (VCM).
VCM is sent through a catalyst-containing reactor where polymerization occurs. In lay terms – chemicals cause the VCM molecules to react until they link together.
The linking of VCM molecules creates PVC resin – which is where all vinyl compounds begin.
PVC resin has a nebulous structure and inherently exhibits fire retardant and chemical resistant properties. Custom rigid, flexible and blended vinyl compounds are formulated by mixing vinyl resin with a variety of plasticizers, stabilizers and modifiers to achieve certain properties - scuff and mar resistance, UV resistance, weatherability, color considerations and texturing capability, to name a few.
Making PVC compounds are very technical, scientific and labor-intensive processes. There are several industries, and a large and varied job sector, that play a supporting role in providing manufacturers all over the world with the compounds they need, which enables them to make the products we all use every day.
Tongxiang long Cheng Plastic Co., Ltd. has nearly 20 years experience on PVC granule research,development and granulation production. Professional and technical service team can provide one-stop system solution for customers.
For more information about products, please visit our website: www.lcpvc.com.
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