Vim li cas cov kav dej PVC hloov xim
May 03, 2023
PVC kav yuav hloov xim rau ntau yam laj thawj thaum siv. Cov neeg siv khoom yuav thuam qhov zoo ntawm cov kav dej PVC thaum lawv pom cov xim ntawm cov kav dej PVC. Qhov tseeb, yog vim li cas rau kev hloov xim ntawm cov yeeb nkab PVC tsis yog qhov zoo ntawm cov yeeb nkab PVC xwb. Cia wb mus saib yog vim li cas rau qhov discoloration ntawm PVC kav.
Cov khoom zoo ntawm PVC
Vim tias muaj cov tertiary chlorine thiab allyl chloride nyob rau hauv cov qauv molecular ntawm PVC, PVC yeeb nkab yog nquag decompose thaum lub sij hawm tsim khoom thiab tom qab siv, ua rau cov yeeb nkab pib hloov xim. Qhov kev txiav txim ntawm cov xim hloov yog dawb, liab, daj, liab, thiab dub ( carbonization), yog li PVC zoo, stabilizer zoo (kom tswj decomposition), thiab ntau npaum li cas yog qhov tseem ceeb.
Discoloration induced los ntawm unqualified titanium dioxide
Feem ntau muaj ob hom qauv: anatase thiab rutile. Vim lawv cov qauv sib txawv, kev ua tau zoo, thiab kev laus tsis kam. Nws yuav tsum yog hom rutile thaum siv los ua PVC yeeb nkab. Txawm li cas los xij, vim muaj teeb meem zoo ntawm qee cov tuam ntxhab lossis vim qhov tsis sib xws ntawm cov txheej txheem, cov xim tsis zoo (greying) yog qhov tshwm sim nyob rau hauv cov xwm txheej ntawm photocatalysis.
