Hais txog yam khoom no
Cov Khoom Siv Hauv Tsev - Zoo meej rau kev siv tes ua haujlwm hauv tsev xws li ntxuav tais diav, tu, tu cov neeg laus, kev npaj paj thiab lwm yam
Ntev Tes Tsho Tiv Thaiv - Cov khoom siv zoo thiab tsis muaj dej tsis zoo PVC nrog cov qauv paj ntawm thaj tsam txuas ntxiv ntawm cov hnab looj tes no
Polyvinyl chloride (PVC) yog tus pib ntawm vinyl chloride monomer (VCM) nyob rau hauv peroxide, azo tebchaw, thiab lwm yam.Los yog nyob rau hauv qhov kev txiav txim ntawm lub teeb thiab kub raws li cov dawb radical polymerization cov tshuaj tiv thaiv mechanism ntawm polymer.The homopolymer ntawm vinyl chloride thiab cov copolymer. vinyl chloride yog hu ua vinyl chloride resins.
PVC rau amorphous qauv ntawm cov hmoov dawb, branched degree yog me me, txheeb ze ntom 1.4, iav hloov kub ntawm 77 ~ 90℃, 170 ib℃los yog thiaj li pib decompose, tsis zoo stability rau cua sov thiab lub teeb, nyob rau hauv ntau tshaj 100℃los yog lub hnub ntev, yuav decompose thiab tsim hydrogen chloride, thiab ntxiv tsis siv neeg catalytic decomposition, ua rau discoloration, lub cev thiab mechanical zog kuj poob sai heev, nyob rau hauv kev xyaum, stabilizers yuav tsum tau ntxiv los txhim kho thermal thiab lub teeb stability.
Qhov hnyav molecular ntawm PVC ua los ntawm kev lag luam feem ntau yog nyob rau hauv thaj tsam ntawm 50,000 ~ 110,000, nrog polydispersity loj, thiab qhov hnyav molecular nce nrog txo qhov kub ntawm polymerization; Tsis tas melting point, 80 ~ 85℃mus soft,130℃rau viscoelastic xeev, 160 ~ 180℃hloov mus rau hauv dej khov hauv lub xeev; Nws muaj cov khoom siv zoo, lub zog tensile ntawm li 60MPa, cuam tshuam lub zog ntawm 5 ~ 10kJ / m2; Zoo heev dielectric zog.
PVC siv los ua lub ntiaj teb loj tshaj plaws ntawm cov khoom siv dav siv hauv ntiaj teb, dav siv.Nws yog dav siv hauv cov khoom siv hauv tsev, cov khoom lag luam, cov khoom siv niaj hnub, hauv pem teb tawv, pem teb pobzeb, tawv tawv, yeeb nkab, hlau thiab cable, ntim zaj duab xis, lub raj mis , foaming khoom, sealing khoom, fiber ntau thiab lwm yam.