Cov khoom siv lub cev thiab cov haujlwm tseem ceeb ntawm PVC ua cov khoom siv pab

Cov khoom siv ua PVC yog cov thermoplastic graft polymer tau los ntawm kev polymerization ntawm methyl methacrylate thiab acrylate los ntawm cov noob pleev. Nws feem ntau yog siv rau kev ua thiab tsim cov khoom siv PVC. Nws muaj cov txiaj ntsig zoo rau kev txhim kho kev tiv thaiv kev cuam tshuam ntawm cov khoom siv PVC. Nws tuaj yeem npaj ntau kauj ruam polymerization siv cov noob pleev polymerization, suav nrog cov tshuaj pleev polymerization ib txwm muaj thiab cov plhaub pleev polymerization. Nws qhov zoo yog nyob rau hauv lub peev xwm los tswj cov khoom sib xyaw, qhov loj me, lub plhaub tuab, piv ntawm lub plhaub rau lub plawv vojvoog, cov yam ntxwv ua haujlwm ntawm qhov chaw, thiab lwm yam ntawm cov khoom raws li qhov xav tau sib txawv thaum lub sijhawm ua cov tshuaj tiv thaiv, thiab qhov faib tawm ntawm cov khoom me me yog sib xws.

Cov khoom siv tseem ceeb rau cov khoom siv ua PVC yog acrylic esters thiab methyl methacrylate. Hauv kev tsim khoom tiag tiag, acrylate feem ntau yog polymerized nrog lwm cov monomers (xws li styrene, acrylonitrile, thiab lwm yam) los ntawm kev siv tshuaj pleev kom tsim tau ib lub polymer nrog qhov kub hloov pauv iav qis, uas yog, lub hauv paus nrog cov khoom elastomer, thiab tom qab ntawd graft copolymerized nrog methyl methacrylate, styrene, thiab lwm yam los tsim ib lub polymer nrog lub plhaub hauv paus. Cov ntsiab lus khov kho ntawm cov tshuaj pleev polymerized no feem ntau yog li 45% ± 3%, thiab cov tshuaj pleev yog ziab thiab qhuav kom cov dej hauv cov khoom tsawg dua 1% (feem pua) kom tau txais cov khoom hmoov dawb.

Kev ua polymerization ntawm cov tshuaj pleev ib ce ntawm lub plhaub tseem ceeb yog lub hauv paus ntawm cov thev naus laus zis tsim cov tshuaj pleev ib ce ntawm ACR. Cov qauv plhaub tseem ceeb ntawm ACR tuaj yeem muab faib ua peb hom: cov qauv plhaub tseem ceeb ntawm lub plhaub tseem ceeb, cov qauv plhaub tseem ceeb ntawm lub plhaub tseem ceeb, thiab cov qauv plhaub tseem ceeb ntawm lub plhaub tseem ceeb. Txawm li cas los xij, cov hom tseem ceeb uas muag tam sim no hauv khw yog "cov qauv plhaub tseem ceeb ntawm lub plhaub tseem ceeb". Cov tshuaj pleev ib ce ntawm ACR nrog cov qauv no muaj kev ua tau zoo thiab siv dav. Kev ua polymerization ntawm cov tshuaj pleev ib ce ntawm lub plhaub tseem ceeb ntawm "cov qauv plhaub tseem ceeb ntawm lub plhaub tseem ceeb" yog ib qho txheej txheem uas cov monomer tawv raug txuas rau ntawm cov noob ntawm cov khoom siv roj hmab mos uas tsim los ntawm thawj kauj ruam ntawm kev ua polymerization ntawm cov tshuaj pleev ib ce. Hom thiab koob tshuaj ntawm cov tshuaj emulsifiers, qhov sib piv ntawm lub plhaub tseem ceeb, txoj kev pub mis ntawm lub plhaub tseem ceeb, qib kev sib txuas ntawm cov noob roj hmab (lub plawv roj hmab), qhov loj ntawm cov noob, thiab hom thiab koob tshuaj ntawm cov neeg sawv cev sib txuas tag nrho muaj kev cuam tshuam loj rau cov qauv plhaub tseem ceeb ntawm cov khoom siv roj hmab ACR thiab kev ua tau zoo ntawm cov khoom kawg ntawm ACR.