Txoj Kev Siv (lossis Txoj Kev Txiav Txim Siab) ntawm Polyvinyl Cawv

Polyvinyl cawv (PVA) yog cov khoom siv hluavtaws uas tau dhau los ua neeg nyiam heev hauv ntau lub lag luam thoob ntiaj teb. Kab lus no piav qhia txog yuav ua li cas PVA tuaj yeem siv thiab yaj thiab piav qhia txog nws cov khoom, nws qhov zoo thiab nws daim ntawv thov nyob rau hauv txoj kev siv ntau dua.

Polyvinyl cawv - Ib qho kev piav qhia

Polyvinyl cawv yog ib qho hluavtaws polymer uas muaj pawg hydroxyl thiab yog tsim los ntawm hydrolysis ntawm polyvinyl acetate. Txij li nws yog soluble hauv dej, nws tuaj yeem siv rau hauv ntau qhov kev lag luam, nrog rau kev ntim khoom thiab tshuaj. Cov txheej txheem polymer matrix no, nrog rau biodegradability, ua rau PVA muaj txiaj ntsig zoo li txheej thiab tsim cov yeeb yaj kiab.

Dissolution Methods ntawm Polyvinyl Cawv

Kev tawg ntawm PVA yog ib lub hom phiaj tseem ceeb hauv kev hais txog nws daim ntawv thov hauv ntau txoj kev qhuab qhia. Qhov tseem ceeb tshaj plaws uas muaj yog cua sov, nplawm, thiab ntxiv ntawm qee cov kuab tshuaj. Thaum dej siv nws qhov kub thiab txias yog feem ntau pom zoo nyob nruab nrab ntawm 80 C thiab 90 C. Nruam nplawm ntawm cov khoom xyaw kom ntseeg tau tias clumping ntawm PVA granules tshwm sim los ntawm qhov tsis sib xws, kom ntseeg tau tias muaj kev sib txuam. Tsis tas li ntawd, co-solvents tuaj yeem siv los nce cov nqi no rau cov kev daws teeb meem siab viscosity hauv cov ntawv thov tshwj xeeb.

Daim ntawv thov nyob rau hauv txawv Industries

PVA yog siv nyob rau hauv lub latitude loj nyob rau hauv ntau yam lag luam xws li textile, ntawv, thiab kev tsim kho. Hauv kev lag luam textile, PVA pab txhim kho lub zog thiab ruaj khov ntawm cov ntaub ua tus neeg sawv cev sizing. Nyob rau hauv cov ntaub ntawv, nws kuj ua hauj lwm raws li ib tug binder thiab tsub kom lub zog thiab zoo ntawm daim ntawv cov khoom. PVA, nyob rau hauv kev tsim kho, yog siv rau hauv cov nplaum thiab sealants, muab kev ruaj khov zoo thiab tsis muaj dej tsis kam. Paub txog cov kev siv tshwj xeeb hauv cov kev lag luam no tuaj yeem pab txhim kho cov txheej txheem ntawm cov tuam ntxhab thiab kev ua haujlwm ntawm lawv cov khoom.

Yuav Siv PVAs zoo dua li cas

Thaum siv PVA, nws yog ib qho tseem ceeb uas yuav tsum tau ua raws li cov kev coj ua zoo tshaj plaws txhawm rau txhim kho qhov zoo ntawm cov polymer no. Qhov no suav nrog kev soj ntsuam qhov kub thiab txias thaum lub sij hawm dissolving lub polymer, txoj cai concentration rau kev siv sib txawv, thiab sib tov kom tau ib tug uniform dispersion. Ib yam li ntawd, kev tshuaj xyuas cov viscosity thiab pH ntawm cov tshuaj formulated tuaj yeem pab txiav txim siab qhov kev hloov kho ntawm cov qauv rau kev ua haujlwm zoo dua. Nws yog ib qho tsim nyog rau cov tuam txhab lag luam saib xyuas cov kev txhawj xeeb hauv ecological hauv lawv cov khoom thiab sim siv biodegradable polymers thaum twg ua tau.

Kev hloov pauv hauv Kev Ua Lag Luam thiab Yam Yuav Tsum Muaj

Undoubtedly, raws li kev ua lag luam rau cov khoom lag luam loj hlob tuaj, yog li qhov kev thov Polyvinyl cawv. Nws cia siab tias PVA yuav ntsib kev sib tw los ntawm cov txheej txheem bio-based PVA thiab txhim kho cov txheej txheem sib cais. Raws li cov lag luam sib zog tsim cov kev daws teeb meem ntsuab ntau dua, yuav muaj qhov tseem ceeb hauv kev ntim khoom thiab kev ua liaj ua teb uas PVA tuaj yeem siv rau hauv cov ntawv thov uas tuaj yeem degraded. Rau cov tuam txhab uas xav ua kom zoo dua ntawm PVA cov yam ntxwv zoo nkauj thaum ua raws li txoj cai lij choj, nws yuav yog qhov tseem ceeb rau kev sib koom ua ke cov qauv no.