Processing of Poly Vinyl Chloride
For a long time after it came into existance , PVC was considered to be a useless Polymer as it would degrade to a dirty, hard and and horny substance on heating. And about which, it was really difficult to think of any usage. Thanks to the additives like ''heat Stabilisers'' and'' plasticisers'' after the invent of which processing of PVC and its conversion into some usable forms and shapes could become feasible.Soon more and more chemicals joined the list of additives which changed the PVC scenario dramatically pushing its use in a host of applications ranging from application as hard as rigid pipes or profiles to as soft as food wraps or hand gloves.
Today the situation is that it is really difficult to pin point an area where PVC does not find an application. |
|
The reason for applicational versatility of PVC lies in its capacity to lend itself to modifications with a number of chemicals(now termed as additives) into materials having characteristics suiting requirements of a number 0f applications.
The ability of the PVC resin to be manufactured through vairous polymerisation techniques like mass, suspension ,solution and emulsion& resulting into products with different characteristics ,Forms yet another reason for the applicational versatilty of PVC.These different types of PVC are termed as :
- Mass polymerised PVC resin -pure uncontaminated form of resin finding applications i
In areas such as medical and specialty electronics.
- Solution polmerised PVC resin -ultrapure resin characterised by ease of solvent
Solubility, finding use in color cocentrates for inks , adhesives and coatings.
- Suspension polymerised PVC resin -high absorption g.p resin with a wide array of
Applications in diverse fields.
- Emulsion polymerised or paste grade PVC resin-sub micron particle size resin with a
Coating of surface- active agents .thes resins have a low absorptivity for plasticizers and are capable
Of getting dispersed in plasticizers to form pastes normally termed as ' plastisols'.
---------------------------------------------------------------------------
|
|
|
