Stabilizers for PVC
Introduction
Stabilizers for PVC is one of the indispensable main additives in PVC processing. The amount of PVC heat stabilizer used is not much, but its role is huge.The use of heat stabilizer in PVC processing can ensure that PVC is not easy to degrade and is relatively stable.The heat stabilizer commonly used in PVC processing are base lead salt stabilizer, metal soap stabilizer, organic tin stabilizer, rare earth stabilizer, epoxy compound and so on.PVC degradation wit complex, different stabilizer action wit is not the same, so the road east amount of stability effect is also different.
Principle of action
(1) Absorb hydrogen chlorideMe(OOCR)2+ 2HCl===MeCl2+ 2HOOCRAmong them, Me is: Pb, Ba, Cd, Ca, Zn, Sn, Sb, Mg, Sr, etc.2) Eliminate unstable chlorine atoms to replace or eliminate unstable chlorine atoms.(3) Prevent auto-oxidizing polyvinyl chloride from being easily degraded by O2 oxidation under the action of hot oxygen and shearing force.(4) Adding the metal salt of maleic acid can inhibit or eliminate the double bond or make it shorter or less.
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