Polyvinyl cawv (PVA) hmoov yog cov dej-soluble hluavtaws polymer uas muaj ntau yam kev siv hauv ntau yam lag luam. Nws yog cov khoom siv linear, polymeric ua los ntawm hydrolysis ntawm polyvinyl acetate (PVAc). Lub degree ntawm hydrolysis (DH) ntawm PVA txiav txim siab nws solubility nyob rau hauv dej, nrog ntau dua DH tus nqi qhia tau hais tias ntau dua solubility. PVA hmoov muaj nyob hauv ntau qib, nyob ntawm tus nqi DH thiab qhov hnyav molecular.

Cov khoom ntawm PVA hmoov PVA hmoov muaj ntau yam khoom tshwj xeeb uas ua rau nws muaj kev xaiv nrov hauv ntau daim ntawv thov. Qee yam ntawm cov khoom no muaj xws li:

1. Dej-solubility: PVA hmoov yog cov dej-soluble heev, ua rau nws yooj yim rau yaj hauv dej los tsim cov tshuaj ntshiab.
2. Zaj duab xis-forming: PVA hmoov tuaj yeem tsim cov duab meej, hloov tau, thiab muaj zog thaum nws yaj hauv dej thiab qhuav.
3. Adhesion: PVA hmoov tuaj yeem ua raws li ntau qhov chaw, ua rau nws nyiam cov nplaum nplaum.
4. Biodegradability: PVA hmoov yog biodegradable, txhais tau tias nws tuaj yeem tawg los ntawm cov txheej txheem ntuj.

Kev siv ntawm PVA hmoov

1. Adhesives: PVA hmoov feem ntau yog siv los ua cov khoom tseem ceeb hauv cov nplaum. Nws yog siv rau hauv kev tsim cov kua nplaum ntoo, ntawv nplaum, thiab textile adhesives. PVA nplaum yog tsim rau kev sib txuas ntawm qhov ntxeem tau, xws li ntawv, duab los qhia, thiab ntoo.
2. Ntim: PVA hmoov yog siv los tsim cov khoom ntim xws li cov yeeb yaj kiab thiab cov txheej txheem. Cov yeeb yaj kiab tsim los ntawm PVA hmoov muaj lub zog tensile siab, zoo roj barrier zog, thiab zoo optical clarity.
3. Kev lag luam textile: PVA hmoov yog siv hauv kev lag luam textile los tsim cov neeg ua haujlwm sizing rau xov paj thiab ntaub. Nws yog siv los ua kom lub zog thiab nruj ntawm cov xov paj los yog ntaub, ua kom yooj yim rau weave thiab tuav.
4. Kev lag luam ntawv: PVA hmoov yog siv nyob rau hauv daim ntawv kev lag luam raws li ib tug ntub-kawg additive. Nws yog siv los txhim kho lub zog, dej tsis kam, thiab luam ntawv ntawm daim ntawv.
5. Kev tsim kho kev lag luam: PVA hmoov yog siv rau hauv kev tsim kho kev lag luam raws li kev khi rau cov cement thiab lwm yam khoom siv. Nws kuj yog siv los ua cov txheej txheem rau cov pob zeb ua kom zoo dua lawv cov dej tsis kam.
6. Cov khoom siv tu tus kheej: PVA hmoov yog siv rau hauv cov khoom tu tus kheej xws li tshuaj tsuag plaub hau, tshuaj zawv plaub hau, thiab gels. Nws yog siv los ua zaj duab xis-yav dhau los thiab cov thickener los txhim kho kev ntxhib los mos thiab kev ua haujlwm ntawm cov khoom no.
7. Kev lag luam kho mob: PVA hmoov yog siv rau hauv kev kho mob kev lag luam los tsim cov hydrogels, cov ntaub qhwv lub qhov txhab, thiab cov tshuab xa tshuaj. Biocompatibility thiab dej-solubility ntawm PVA ua rau nws yog ib qho khoom siv zoo tshaj plaws rau cov ntawv thov no.

Hom PVA hmoov PVA hmoov muaj nyob hauv ntau qib, nyob ntawm nws tus nqi DH thiab qhov hnyav molecular. Tus nqi DH ntawm PVA hmoov yog li ntawm 87% txog 99%. Qhov siab dua tus nqi DH, ntau cov dej-soluble PVA hmoov yog. Qhov hnyav molecular ntawm PVA hmoov yog los ntawm ntau txhiab mus rau ntau lab.

1. Siab hydrolyzed PVA hmoov: Hom PVA hmoov no muaj DH tus nqi ntawm 99% lossis siab dua. Nws yog dej-soluble heev thiab muaj cov yeeb yaj kiab zoo heev. Nws yog feem ntau siv rau hauv daim ntawv thov xws li nplaum, ntim, thiab textiles.
2. Ib nrab hydrolyzed PVA hmoov: Hom PVA hmoov no muaj DH tus nqi xws li 87% mus rau 98%. Nws yog dej-soluble tsawg dua li tag nrho hydrolyzed PVA hmoov thiab muaj cov yeeb yaj kiab-tsim qis dua. Nws yog feem ntau siv rau hauv daim ntawv thov xws li ntawv thiab kev tsim kho.