Polyvinyl chloride

Polyvinyl chloride, PVC, yog ib tug polymer tsim los ntawm vinyl chloride monomer (VCM) nyob rau hauv peroxide, azo tebchaw los yog polymerization mechanism ntawm radical polymerization nyob rau hauv lub teeb thiab tshav kub.Ethylene chloride homopolymer thiab vinyl chloride copolymer system yog hu ua vinyl chloride resin.PVC yog ib lub ntiaj teb loj tshaj plaws ntau yam khoom yas thiab tau siv dav.Nws yog dav siv hauv cov khoom siv hauv tsev, cov khoom lag luam, cov khoom siv niaj hnub, cov tawv tawv hauv pem teb, hauv pem teb cib, tawv tawv, cov khoom siv yeeb nkab, hlau thiab cable, ntim zaj duab xis, lub raj mis, cov ntaub ntawv ua npuas ncauj, cov ntaub ntawv sib khi, fiber ntau thiab lwm yam.Raws li qhov sib txawv ntawm daim ntawv thov, PVC tuaj yeem muab faib ua: hom PVC resin, siab polymerization PVC resin, cross-linked PVC resin.General hom PVC resin yog tsim los ntawm polymerization ntawm vinyl chloride monomer nyob rau hauv qhov kev txiav txim ntawm pib;siab polymerization PVC resin hais txog lub polymer ntawm polymerization system;thiab crosslinked PVC resin yog tsim los ntawm tus neeg sawv cev crosslinking uas muaj diene thiab polyene nyob rau hauv vinyl chloride monomer polymerization system.Raws li txoj kev nrhiav tau ntawm ethylene chloride monomer, nws tuaj yeem muab faib ua calcium carbide method, ethylene method thiab imported (EDC, VCM) monomer method (ethylene method and imported monomer method is habitually called ethylene method).Raws li cov txheej txheem polymerization, PVC tuaj yeem muab faib ua plaub pawg: txoj kev tshem tawm PVC, emulsion method PVC, bulk method PVC, tov method PVC.Suspension PVC yog qhov loj tshaj tawm los, suav txog li 80% ntawm tag nrho PVC.Txoj kev ncua kev kawm ntawm PVC yog muab faib ua 6 qauv: XS-1, XS-2..., XS-6;XJ-1, XJ-2..., XJ-6.Lub ntsiab lus ntawm txhua tsab ntawv hauv tus qauv: X-txheej txheem txheej txheem;S-loj hom;J-tight hom.Raws li cov ntsiab lus ntawm plasticizer, PVC yas ene yas feem ntau muab faib ua: tsis muaj plasticizer PVC, cov ntsiab lus plasticizer yog 0;tawv PVC, cov ntsiab lus yas yog tsawg dua 10%;semi-hard PVC, plasticizer cov ntsiab lus ntawm 10-30%;mos PVC, plasticizer cov ntsiab lus ntawm 30-70%;polyvinyl