PVC thaum tshav kub kub stabilizer yog ib qho tseem ceeb ntawm cov khoom siv tseem ceeb hauv kev ua PVC. PVC kub stabilizer yog siv nyob rau hauv ib tug me me ntawm qhov chaw, tab sis nws lub luag hauj lwm yog loj. Kev siv cov cua sov stabilizer hauv kev ua PVC tuaj yeem ua kom ntseeg tau tias PVC tsis yooj yim rau degrade thiab ruaj khov. PVC stabilizers muaj xws li cov hmoov lead ntsev stabilizers, hlau xab npum stabilizers, organotin stabilizers, tsis tshua muaj lub ntiaj teb stabilizers, epoxy compounds, thiab lwm yam. Lub degradation mechanism ntawm PVC yog complex, kev txiav txim mechanism ntawm txawv stabilizers kuj txawv, thiab stabilization nyhuv kuj txawv.
PVC stabilizer yog ib hom reagent uas tuaj yeem ruaj khov siab polymer yas, roj hmab thiab hluavtaws fibers thiab tiv thaiv lawv cov decomposition thiab kev laus. Nws tuaj yeem ua rau qeeb cov tshuaj tiv thaiv, tswj cov tshuaj sib npaug, txo qhov nro ntawm qhov chaw, tiv thaiv lub teeb, thermal decomposition lossis oxidative decomposition, thiab flexibly siv cov tshuaj kom ua tiav lub hom phiaj ntawm cov khoom ruaj khov. Nyob rau hauv cov txheej txheem ntawm kev ua, lub luag haujlwm tseem ceeb ntawm PVC stabilizer yog: inhibiting qhov degradation ntawm PVC molecules los ntawm kev hloov cov tshuaj chlorine tsis ruaj khov, absorbing chlorination cua thiab ntxiv cov tshuaj tiv thaiv nrog unsaturated qhov chaw. Lub thermal decomposition ntawm PVC muaj kev hloov me ntsis rau lwm yam khoom, feem ntau cuam tshuam rau cov xim ntawm cov khoom tiav. Qhov sib ntxiv ntawm cov cua sov stabilizer tuaj yeem cuam tshuam cov xim thawj zaug ntawm cov khoom. Thaum cov feem loj ntawm HCI tshem tawm mus txog 01 feem pua, cov xim ntawm PVC pib hloov.
Raws li tus naj npawb ntawm kev sib txuas ob daim ntawv cog lus tsim, PVC yuav pom cov xim sib txawv (daj, txiv kab ntxwv, liab, xim av thiab dub). Yog tias muaj cov pa oxygen thaum lub sij hawm thermal decomposition ntawm PVC, colloidal carbon, peroxide, carbonyl thiab ester tebchaw yuav tsim. Txawm li cas los xij, nyob rau hauv kev siv lub sij hawm ntev ntawm cov khoom, thermal degradation ntawm PVC muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm cov khoom. Qhov sib ntxiv ntawm cov cua sov stabilizer tuaj yeem ncua lub sijhawm degradation ntawm PVC los yog txo qhov degree ntawm PVC degradation.
