Polyvinyl cawv yog soluble hauv dej. Polyvinyl cawv (PVA) yog xim tsis muaj xim, tsis muaj ntxhiab, thiab tsis yog -polymer tshuaj lom. Vim muaj ntau ntawm hydroxyl functional pawg nyob rau hauv nws cov qauv, cov pab pawg no tuaj yeem tsim hydrogen bonds nrog dej molecules, yog li ua kom PVA yaj hauv dej. Thaum yaj hauv dej, PVA molecules tsim hydrogen daim ntawv cog lus nrog cov dej molecules, uas ua rau muaj kev sib tov sib xyaw.
Polyvinyl cawv ua haujlwm rau ntau lub hom phiaj. Hauv qab no yog qee qhov kev siv ntawm polyvinyl cawv:
1. Cov khoom siv tshuaj pleev ib ce thiab kev tu tus kheej: PVA yog siv los ua cov khoom ua kom tuab thiab stabilizer hauv cov tshuaj pleev ib ce thiab cov khoom tu tus kheej, xws li tshuaj pleev ntsej muag, tshuaj zawv plaub hau, thiab tshuaj pleev plaub hau.
2. Cov ntaub ntawv ntim khoom: PVA ua cov nplaum rau hauv cov ntaub ntawv ntim, xws li cov nplaum nplaum thiab cov ntawv qhwv.
3. Textiles: PVA yog siv rau hauv kev lag luam textile los txhim kho cov softness thiab abrasion tsis kam ntawm fibers.
4. Kev Lag Luam Kho Mob: PVA yog ua haujlwm hauv kev kho mob rau kev tsim cov khoom siv kho mob pov tseg, suav nrog hnab looj tes, catheters, thiab cov ntaub qhwv lub qhov txhab.
5. Adhesives: Vim nws qhov muaj viscosity thiab cov khoom nplaum, PVA yog siv los ua cov nplaum rau kev sib txuas ntoo, ntawv, thiab fiberboard.
6. Ntawv thiab Pulp Kev Lag Luam: PVA ua raws li kev ua tau zoo hauv kev lag luam ntawv thiab cov ntaub so ntswg, txhim kho lub zog thiab pob tshab ntawm daim ntawv.
7. Kev ntim khoom noj: PVA yog siv los ua cov khoom siv txheej hauv cov ntim khoom noj kom muab cov txiaj ntsig khaws cia thiab cov khoom thaiv.
8. Kev Ua Liaj Ua Teb: Hauv kev ua liaj ua teb, PVA yog siv los ua cov txheej txheem rau tshuaj tua kab thiab chiv, tiv thaiv lawv los ntawm kev tsis zoo ntawm cov dej noo thiab lub teeb.
Hauv cov ntsiab lus, polyvinyl cawv pom ntau daim ntawv thov thoob plaws ntau thaj chaw; nws cov khoom tshwj xeeb tsim nws ua ib qho tseem ceeb hluavtaws cob.