Where the polymer to improve the heat stability of adding additives for the purpose may be referred to as heat stabilizers. In addition to the small quantity of heat stabilizer used in rubber processing and other resin, mainly used for thermal stability of an extremely prominent issue of PVC processing. PVC thermal degradation mechanism is quite complicated, and likewise, PVC Stabilizer mechanism is quite elaborate. At present, all-inclusive research, the role of heat stabilizer may be summarized in preventing sort (and HCl, to replace the uncertainty of the Cl atom as well as the avoidance of auto-oxidation) and kind remedies (PVC and non-drenched portions of the response, the destruction of carbon ions are) two Species. As follows:
1. Absorption and HCl, inhibiting its catalytic effect automatically. They can react with HCl, the quelling of HCl from PVC response. 2. PVC replacing elements of uncertainty in t or the allyl chloride -carbon atom of chlorine atoms, the suppression from pvc stabilizer manufacturer. Organotin stabilizers such as chlorine and PVC elements of instability appeared in the ligand, organic uncertainty and tin in the replacing of chlorine atoms, in the original complex. 3. Polyene the destruction of large conjugate system formation, the addition reaction and construction, to decrease the shading. Together with the PVC molecules conjugated diene double bond addition reaction happened to be able to break the yoke of its structure, color suppression unsaturated fatty acid includes a double bond salt or ester. 4. Capturing free radicals to stop oxidation. In case the accession to the phenolic heat stabilizers to block off HCl, is expected to provide the H-atom to free radicals and free radical molecules degradation of the PVC coupling, can not be formed with the O2 react to the material, and has a stabilizing effect on the heat. This heat stabilizer may have one or both of several jobs. The ideal of PVC heat stabilizers ought to be a multi-function stuff, or some mixture of materials, they can attain the following: 1. Lively exchange, the instability of the substituents, like t-Cl joined to allyl chloride or the Cl atom, to form a stable structure; 2. Absorption and processing of PVC and in the method of release of HCl, the removal of HCl automatic catalytic degradation; 3. passive and act as a catalyst for the degradation of the metal ions and other harmful impurities; 4. There's the very best protection against ultraviolet shielding effects.
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