PVC hloov kho
Jun 02, 2018
Raws li tau hais los saum no, PVC yog hmoov dawb, amorphous qauv ntawm iav hloov kub ntawm 77 ~ 90 ℃, 170 ℃ los yog pib pib decompose, siab tshaj 100 ℃ lossis lub hnub ntev, yuav decompose thiab tsim hydrogen chloride, thiab ntxiv automatic catalytic decomposition, ua rau muaj suab thaj, lub cev thiab cov khoom siv dag zog kuj poob sai heev, hauv daim ntawv thov ntawm stabilizer thiab lwm cov khoom ntxiv yuav tsum ntxiv kom txhim kho kom ruaj ntseg ntawm kev kub thiab lub teeb. Qhov no hu ua PVC hloov. PVC cov khoom, ob leeg txhaj molding thiab extrusion, tshwj xeeb tshaj yog PVC cov khoom cov khoom muaj kev tshwj xeeb, hais lus nruj, cov khoom ntawm PVC cov ntaub ntawv yuav tsum muaj rau tus neeg muas zaub - tsim, tshwj xeeb tshaj yog tsim los ua kom tau raws li kev cai ntawm txhua tus neeg, muab tov rau PVC, txawv mis rau kev hloov kho.
Kev tsim kho ntawm PVC hloov
Xyoo 1933, WL Ximoos tau npaj siab siv cov roj ua kom tsis muaj zog boilers thiab trimethylphenol phosphate kom sov thiab sib tov nrog PVC, uas yuav ua tiav rau cov khoom siv polyvinyl chloride, uas ua rau lub tswv yim siv PVC. Nyob rau hauv 1936, qhov muab rho tawm polymerization ntawm yas chloride thiab cov ua thiab daim ntawv thov ntawm PVC raug tsim. Thiaj li yuav ua kom yooj yim rau cov txheej txheem ntau thiab txo qhov kev siv zog, hauv xyoo 1956, cov neeg dawb huv-cov khoob hauv qhov tsim tau ntau txoj kev siv polymerization. Muaj cov kev cai tshwj xeeb ntawm PVC cov khoom, feem ntau yuav tsum tau raug xa tawm los ntawm abroad, nrog Tuam Tshoj cov kev tshawb fawb tshawb fawb thiab kev tsim cov khoom txuas mus ntxiv thiab kev tsim kho thiab kev siv technology, PVC hloov cov qauv tsim, kev tsim tawm ntawm cov khoom siv khi yas tshiab qib siab thoob ntiaj teb, tau raug kiag li hloov cov ntaub ntawv tuaj, muaj ntau cov khoom tau raug xa tawm txawv teb chaws. Vim tias PVC yuav ntxiv cov stabilizers hauv ntau lawm, tab sis cov stabilizers tsis yog cov tshuaj lom neeg thiab cov tshuaj lom, tsuas yog thaum muaj tshuaj lom neeg xws li txhuas cov ntsev ntxiv, yuav muaj kev piam sij. Tab sis PVC khoom yog sib xyaw, thiab qee lub koom haum me me siv cov ntsev ntses li stabilizer, uas yog qhov nyuaj ua kom tau raws li cov qauv kev tu cev.
Lead yog txwv los ntawm PVC cov ntaub ntawv
Nws yog ib lub ntsiab lus uas yuav txwv tsis pub muaj cov hlau lead hauv PVC. Vim tias cov khoom ua tau ua rau cov neeg muaj mob hnyav ua rau neeg muaj mob hnyav, pib thaum xyoo 1980 s, Tebchaws Europe thiab Tebchaws Meskas, thiab lwm lub tebchaws tau pib txwv tsis pub siv cov ntsev thov, thiab tau muab cov kev cai txwv txiav kev taug txhuas. Txij xyoo 21 no, Tuam Tshoj txoj kev lag luam tswj kev lag luam txwv tsis pub ua lub suab qis dua. Kev ua haujlwm ntawm kev tsim kho tshaj tawm hauv xyoo 2004 uas ua rau cov thermal thermal stabilizers raug txwv hauv PVC kav rau dej thoob plaws hauv lub tebchaws. Nyob rau hauv 2006, cov kev ntsuas ntawm cov pa phem ntawm hluav taws xob cov ntaub ntawv tawm los ntawm Tuam Tshoj kuj tau txwv thiab txwv rau cov hlau loj xws li cov hlau lead, cadmium thiab barium hauv cov ntaub ntawv hluav taws xob. Cov koom haum kev lag luam kuj tseem tuaj yeem txhawb kev ua lag luam txwv.