Cov tshuaj PVC uas tau los ntawm kev polymerization tsis ruaj khov heev vim nws tsis tshua muaj thermal stability thiab siab yaj viscosity. Nws yuav tsum tau hloov kho ua ntej ua tiav cov khoom tiav. Nws cov khoom tuaj yeem txhim kho / hloov kho los ntawm kev ntxiv ntau yam khoom ntxiv, xws li cov tshuaj heat stabilizers, UV stabilizers, plasticizers, impact modifiers, fillers, flame retardants, pigments, thiab lwm yam.
Kev xaiv cov tshuaj ntxiv no los txhim kho cov yam ntxwv ntawm cov polymer yog nyob ntawm qhov yuav tsum tau ua thaum kawg. Piv txwv li:
1. Cov yas (Phthalates, Adipates, Trimellitate, thiab lwm yam) yog siv los ua cov neeg sawv cev mos kom txhim kho rheological thiab kev ua haujlwm kho tshuab (toughness, strength) ntawm cov khoom vinyl los ntawm kev nce qhov kub. Cov yam ntxwv uas cuam tshuam rau kev xaiv cov yas rau vinyl polymer yog: Polymer compatibility; qis Volatility; nqi.
2. PVC muaj qhov ruaj khov thermal qis heev thiab cov stabilizers pab tiv thaiv kev puas tsuaj ntawm polymer thaum lub sijhawm ua lossis raug lub teeb. Thaum raug cua sov, cov tshuaj vinyl pib ua rau muaj kev cuam tshuam dehydrochlorination tus kheej thiab cov stabilizers no neutralize HCl tsim tawm txhim kho lub neej ntawm polymer. Cov yam ntxwv yuav tsum tau xav txog thaum xaiv cov stabilizer cua sov yog: cov kev cai lij choj; kev pom zoo los ntawm kev cai lij choj; tus nqi.
3. Cov tshuaj ntxiv rau hauv cov khoom sib xyaw PVC vim ntau yam laj thawj. Niaj hnub no, cov tshuaj ntxiv tuaj yeem yog cov khoom siv ntxiv rau kev ua tau zoo tiag tiag los ntawm kev xa cov nqi hauv txoj hauv kev tshiab thiab nthuav ntawm tus nqi qis tshaj plaws. Lawv pab: ua kom muaj zog thiab ruaj khov, txhim kho kev ua tau zoo, ntxiv xim, opacity thiab conductivity thiab ntau ntxiv.
Calcium carbonate, titanium dioxide, calcined clay, iav, talc thiab lwm yam yog cov hom fillers siv hauv PVC.
4. Cov roj nplua nyeem sab nraud yog siv los pab kom PVC yaj hla dhau cov khoom siv ua haujlwm tau zoo. Thaum cov roj nplua nyeem sab hauv txo cov viscosity yaj, tiv thaiv kom tsis txhob kub dhau thiab xyuas kom meej tias cov khoom muaj xim zoo.
5. Lwm cov tshuaj ntxiv xws li cov khoom siv pab ua haujlwm, cov khoom hloov pauv, raug ntxiv los txhim kho cov khoom siv kho tshuab thiab cov khoom nto ntawm PVC.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-13-2022