PVC ncua kev kawm ntawv polymerization
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PVC ncua kev kawm ntawv polymerization
Lub monomer raug tshem tawm thiab dispersed nyob rau hauv aqueous theem nyob rau hauv ib tug microdroplet yam, thiab xaiv cov roj-soluble pib yog yaj nyob rau hauv lub monomer, thiab cov tshuaj tiv thaiv polymerization yog nqa tawm nyob rau hauv lub tee dej, thiab lub polymerization tshav kub yog absorbed los ntawm dej nyob rau hauv lub sij hawm, Txhawm rau kom ntseeg tau cov tee hauv daim ntawv ntawm cov hlaws dispersed hauv dej, 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. Convergence