Thermostatic Mechanism ntawm PVC

Nyob rau hauv cov txheej txheem ntawm kev ua, thermal decomposition ntawm PVC tsis hloov lwm yam khoom, uas feem ntau cuam tshuam rau cov xim ntawm cov khoom tiav. Qhov sib ntxiv ntawm thermal stabilizer tuaj yeem cuam tshuam qhov pib xim ntawm cov khoom. Thaum lub stripped HCl loj feem mus txog 0.1 feem pua, cov xim PVC pib hloov.Nyob ntawm tus naj npawb ntawm conjugated ob daim ntawv cog lus tsim, PVC yuav tshwm nyob rau hauv cov xim sib txawv (daj, txiv kab ntxwv, liab, xim av, thiab dub). Yog tias muaj cov pa oxygen hauv cov txheej txheem thermal decomposition ntawm PVC, yuav muaj cov cim ntawm colloidal carbon, peroxide, pawg, thiab ester-based compounds. Txawm li cas los xij, nyob rau lub sijhawm 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 thermal stabilizer tuaj yeem ncua lub sijhawm ntawm PVC degradation lossis txo qhov degree ntawm PVC degradation.
Ntxiv cov thermal stabilizer hauv cov txheej txheem ntawm PVC ua tau tuaj yeem cuam tshuam qhov degradation ntawm PVC, yog li lub luag haujlwm tseem ceeb ntawm thermal stabilizer yog: inhibiting qhov degradation ntawm PVC molecules los ntawm kev hloov cov chlorine atoms tsis ruaj khov, absorbing hydrogen chloride, thiab cov tshuaj tiv thaiv ntxiv nrog rau qhov chaw tsis txaus. .
Ib qho zoo tagnrho thermal stabilizer yuav tsum muaj ntau yam haujlwm:
(1) Hloov cov khoom nquag thiab tsis ruaj khov, xws li chlorine atoms lossis allyl chloride txuas rau tertiary carbon atoms, tsim cov qauv ruaj khov;
(2) Absorb thiab neutralize HCl tso tawm thaum lub sij hawm ua PVC kom tshem tawm cov tsis siv neeg catalytic degradation ntawm HCl
(3) Cov hlau ions uas nws qhov nruab nrab lossis kev ua kom tsis muaj zog thiab lwm yam tsis zoo uas ua rau lub luag haujlwm catalytic rau degradation;
(4) Ntau hom tshuaj tiv thaiv tuaj yeem thaiv qhov kev loj hlob tsis tu ncua ntawm cov ntawv cog lus tsis txaus ntseeg thiab inhibit degradation thiab xim;
(5) Nws yog qhov zoo tshaj kom muaj kev tiv thaiv thiab tiv thaiv lub teeb ntawm ultraviolet.