PVC ua kev pab yog ib qho thermoplastic graft polymer tau los ntawm polymerization ntawm methyl methacrylate thiab acrylate los ntawm cov noob pleev. Nws yog tsuas yog siv rau kev ua thiab tsim cov ntaub ntawv PVC. Nws muaj txiaj ntsig zoo rau kev txhim kho qhov cuam tshuam ntawm cov ntaub ntawv PVC. Nws tuaj yeem npaj cov txheej txheem polymerization ntau kauj ruam siv cov noob tshuaj pleev xim polymerization, nrog rau cov tshuaj pleev ib ce polymerization thiab core plhaub pleev xim polymerization. Nws qhov kom zoo dua yog muaj peev xwm tswj tau qhov muaj pes tsawg leeg, qhov loj me, lub plhaub tuab, qhov sib piv ntawm lub plhaub rau lub voj voog ntawm cov tub ntxhais, cov yam ntxwv ntawm qhov chaw ua haujlwm, thiab lwm yam ntawm cov khoom raws li qhov xav tau sib txawv thaum lub sij hawm sib txawv ntawm cov txheej txheem synthesis, thiab qhov tshwm sim particle loj tis yog ib yam zoo sib xws. .
Cov ntaub ntawv tseem ceeb rau kev ua cov khoom siv PVC yog acrylic esters thiab methyl methacrylate. Hauv kev tsim khoom tiag tiag, acrylate feem ntau yog thawj polymerized nrog lwm cov monomers (xws li styrene, acrylonitrile, thiab lwm yam) los ntawm cov tshuaj pleev ib ce los ua ib lub polymer nrog cov iav hloov qis, uas yog, cov tub ntxhais uas muaj cov khoom elastomer, thiab tom qab ntawd graft copolymerized nrog methyl methacrylate. , styrene, thiab lwm yam los tsim ib lub polymer nrog cov qauv plhaub. Cov ntsiab lus ntawm cov tshuaj pleev xim polymerized no feem ntau yog li 45% ± 3%, thiab cov tshuaj pleev xim kom qhuav thiab lub cev qhuav dej kom cov dej ntsiab lus ntawm cov khoom tsawg dua 1% (feem ntau) kom tau txais cov khoom siv hmoov dawb.
Core plhaub pleev xim polymerization yog cov tub ntxhais ntawm ACR resin ntau lawm tshuab. Lub plhaub tseem ceeb ntawm ACR tuaj yeem muab faib ua peb hom: hard core soft shell structure, soft core hard shell structure, and hard soft hard three-layer structure. Txawm li cas los xij, ntau yam tseem ceeb tam sim no muag ntawm kev ua lag luam yog "soft core hard shell structure". ACR resins nrog cov qauv no muaj kev ua tau zoo thiab tau siv dav. Cov core plhaub pleev xim polymerization ntawm "soft core hard plhaub qauv" yog txheej txheem uas nyuaj monomer grafted mus rau cov noob ntawm mos latex hais los ntawm thawj kauj ruam ntawm tshuaj pleev ib ce polymerization. Hom thiab ntau npaum li cas ntawm emulsifiers, core-plhaub piv, plhaub monomer pub txoj kev, crosslinking degree ntawm noob latex hais (rubber core), noob particle loj, thiab hom thiab ntau npaum li cas ntawm crosslinking tus neeg saib xyuas tag nrho muaj ib qho tseem ceeb cuam tshuam rau lub core-plhaub qauv. ntawm ACR latex hais thiab cov khoom kawg ua haujlwm ntawm ACR.
Post lub sij hawm: Jun-12-2024
