PVC cob tau los ntawm polymerization tsis ruaj tsis khov vim nws tsis tshua muaj thermal stability & siab yaj viscosity. Nws yuav tsum tau hloov kho ua ntej ua cov khoom tiav. Nws cov khoom tuaj yeem txhim kho / hloov kho los ntawm kev ntxiv ntau yam khoom ntxiv, xws li kub stabilizers, UV stabilizers, plasticizers, cuam tshuam kev hloov pauv, muab tub lim, nplaim hluav taws, pigments, thiab lwm yam.
Kev xaiv cov khoom siv no los txhim kho cov khoom siv polymer yog nyob ntawm qhov kawg ntawm daim ntawv thov. Piv txwv li:
1.Plasticizers (Phthalates, Adipates, Trimellitate, thiab lwm yam) yog siv los ua softening agents los txhim kho rheological thiab mechanical kev ua tau zoo (toughness, zog) ntawm cov khoom yas los ntawm kev nce qhov kub thiab txias. Yam tseem ceeb uas cuam tshuam rau kev xaiv cov yas yas rau yas polymer yog: Polymer compatibility; Tsawg Volatility; nqi.
2.PVC muaj cov thermal stability tsawg heev thiab cov stabilizers pab tiv thaiv degradation ntawm polymer thaum ua los yog raug rau lub teeb. Thaum raug tshav kub, vinyl tebchaw pib ib tus kheej-accelerating dehydrochlorination cov tshuaj tiv thaiv thiab cov stabilizers neutralize HCl uas ua rau kom lub neej ntawm polymer. Cov yam tseem ceeb uas yuav tsum tau txiav txim siab thaum xaiv cov cua sov stabilizer yog: cov kev cai; kev pom zoo; tus nqi.
3.Fillers tau ntxiv rau hauv cov khoom siv PVC rau ntau yam laj thawj. Niaj hnub no, tus muab tub lim tuaj yeem yog qhov ua tau zoo ntxiv los ntawm kev xa tus nqi hauv txoj kev tshiab thiab nthuav dav ntawm tus nqi qis tshaj plaws. Lawv pab: ua kom nruj thiab lub zog, txhim kho kev cuam tshuam kev ua haujlwm, ntxiv xim, opacity thiab conductivity thiab ntau dua.
Calcium carbonate, titanium dioxide, calcined av nplaum, iav, talc thiab lwm yam yog ntau hom fillers siv hauv PVC.
4.External lubricants yog siv los pab txoj kev du ntawm PVC yaj los ntawm cov khoom siv. thaum lub lubricants sab hauv txo cov viscosity yaj, tiv thaiv overheating thiab xyuas kom meej cov xim zoo ntawm cov khoom.
5.Lwm cov khoom siv ntxiv xws li kev pab cuam, kev hloov pauv hloov, yog ntxiv los txhim kho cov neeg kho tshuab thiab cov khoom nto ntawm PVC.
Post lub sij hawm: Dec-13-2022