PVC polymerization txoj kev
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PVC polymerization txoj kev
PVC yog npaj los ntawm dawb radical ntxiv polymerization. Txoj kev polymerization feem ntau yog muab faib ua cov txheej txheem ncua kev kawm ntawv polymerization, emulsion polymerization txoj kev thiab bulk polymerization txoj kev. Txoj kev suspension polymerization feem ntau yog siv, suav txog li 80% ntawm tag nrho cov khoom siv PVC. Cov dej ntshiab, liquefied VCM monomer thiab dispersing tus neeg sawv cev yog ntxiv rau cov tshuaj tiv thaiv hlab ntsha, thiab ces tus pib thiab lwm yam auxiliary agents ntxiv. Tom qab qhov kub thiab txias tau nce mus rau qhov kub thiab txias, VCM monomer tau dhau los ua cov khoom siv hluav taws xob los tsim cov PVC. Kev ntxhov siab tas mus li ua rau qhov loj me ntawm cov khoom sib xws thiab cov khoom ua rau raug tshem tawm hauv dej. Tsis tas li ntawd, cov resin rau PVC muab tshuaj txhuam yog tsim los ntawm txoj kev microsuspension, thiab cov khoom siv thiab pasteability yog qhov zoo.
1 Suspension polymerization txoj kev tso cai rau cov monomer raug tshem tawm thiab dispersed nyob rau hauv lub aqueous theem nyob rau hauv daim ntawv ntawm cov tee dej. Cov xaiv roj-soluble pib yog yaj nyob rau hauv lub monomer, thiab cov tshuaj tiv thaiv polymerization yog nqa tawm nyob rau hauv cov tee dej, thiab lub tshav kub ntawm polymerization yog absorbed los ntawm dej nyob rau hauv lub sij hawm. Nws tau ua kom ntseeg tau tias cov tee dej no tau tawg mus rau hauv daim ntawv hlaws hauv dej, thiab nws yog ib qho tsim nyog yuav tsum tau ntxiv cov stabilizer xws li gelatin, polyvinyl cawv, methyl cellulose, hydroxyethyl cellulose lossis lwm yam. Feem ntau ntawm cov pib siv cov organic peroxides thiab azo tebchaw, xws li diisopropyl peroxydicarbonate, dicyclohexyl peroxydicarbonate, diethylhexyl peroxydicarbonate thiab azobisisoheptanenitrile, thiab Nitrogen diisobutyronitrile thiab lwm yam. Lub polymerization yog nqa tawm nyob rau hauv ib lub nkoj polymerization nrog ib tug stirrer. Tom qab polymerization, cov khoom ntws mus rau hauv lub tank rov qab los yog lub stripper kom rov qab tau cov monomer. Tom qab ntawd, nws ntws mus rau hauv lub khob sib tov, ntxuav nrog dej, centrifuged thiab lub cev qhuav dej, thiab qhuav kom tau cov khoom tiav. Cov vinyl chloride monomer yuav tsum tau muab tshem tawm ntawm cov resin kom ntau li ntau tau. Rau PVC rau ntim khoom noj, cov ntsiab lus dawb monomer yuav tsum tau tswj qis dua 1ppm. Txhawm rau kom ntseeg tau tias cov resin muaj qhov hnyav molecular thiab qhov hnyav molecular faib ntau yam tau txais thaum lub sijhawm polymerization thiab tiv thaiv kev tawg, nws yog ib qho tsim nyog los tswj qhov kub thiab txias ntawm cov txheej txheem polymerization. Lub particle loj thiab particle loj tis ntawm cov resin yog tswj los ntawm agitation ceev thiab kev xaiv thiab npaum li cas ntawm ncua kev kawm ntawv stabilizer. Qhov zoo ntawm cov resin yog tus yam ntxwv ntawm particle loj thiab particle loj tis, molecular hnyav thiab molecular hnyav tis, pom meej ntom, porosity, fisheye, thermal stability, xim, impurity cov ntsiab lus, thiab dawb ntws ntawm cov hmoov.