Polyvinyl cawv (PVA) zaj duab xis yog dav siv nyob rau hauv ntau yam lag luam vim nwsbiodegradability, dej solubility, thiab zoo heev film-forming zog. Txawm li cas los xij, ua tiav qhov zooPVA zaj duab xis txheejyuav tsum tau xaiv cov khoom siv raw. Kev nkag siab txog cov khoom xyaw tseem ceeb no yog qhov tseem ceeb rau kev txhim kho cov yeeb yaj kiab, kev ua haujlwm ntev, thiab kev ua haujlwm.
1. Polyvinyl Alcohol (PVA) – Cov khoom tseem ceeb
Hauv plawv ntawm PVA zaj duab xis txheej lus dagpolyvinyl cawv, hluavtaws polymer uas muab cov adhesion zoo, yoog raws, thiab cov khoom thaiv. Qhov hnyav molecular thiab degree ntawm hydrolysis ntawm PVA ncaj qha cuam tshuam rauzaj duab xis lub zog, solubility, thiab tshuaj tiv thaiv. Xaiv cov qib PVA zoo ua kom pom kev ua haujlwm zoo hauv cov ntawv thov xws li ntim khoom, kev ua liaj ua teb, thiab tshuaj.
2. Plasticizers - Txhim khu kev yooj yim thiab muaj zog
Plasticizers ntxiv rautxhim kho qhov yooj thiab cov khoom siv kho tshuabntawm PVA films. Yog tsis muaj plasticizers, zaj duab xis yuav nkig thiab nquag tawg. Common plasticizers siv nyob rau hauvPVA zaj duab xis txheejsuav nrog:
•Glycerol-Ib tug siv dav siv plasticizer uas txhim khu kev yoog raws thiab khaws noo noo.
•Polyethylene Glycol (PEG)- Txhim kho zaj duab xis elasticity thiab tiv thaiv shrinkage.
•Sorbitol- Txhim kho durability thaum tswj cov qib siab ntawm pob tshab.
Xaiv cov plasticizer txoj cai pab sib npauglub zog, pob tshab, thiab yoog rawsrau kev xav tau kev lag luam sib txawv.
3. Crosslinking Agents - Txhim kho cov kav ntev thiab dej tsis kam
PVA zaj duab xis feem ntau xav tau cov neeg sawv cev sib txuas rautxhim khu tshuaj tiv thaiv, noo noo stability, thiab mechanical zog. Cov neeg ua haujlwm no ua haujlwm los ntawm kev tsim cov tshuaj sib txuas ntawm cov saw hlau polymer, ua rau cov yeeb yaj kiab ntau duaresilient thiab ruaj khov. Common crosslinking agents muaj xws li:
•Borax (zeeg)- Txhim kho zaj duab xis toughness thiab adhesion zog.
•Glutaraldehyde- Txhim kho dej tsis kam thaum tswj kev yoog raws.
•Dicarboxylic Acids- Txhim kho cov qauv zaj duab xis yam tsis muaj kev cuam tshuam biodegradability.
Txoj cai ua ke ntawm crosslinking agents kom aPVA zaj duab xis ntev dua thiab ua haujlwm siab.
4. Fillers - Txhim kho cov khoom siv kho qhov muag thiab kho qhov muag
Txhawm rau hloov qhov kev ntxhib los mos, tsos, thiab kev ua haujlwm ntawm PVA zaj duab xis txheej,fillersfeem ntau ntxiv. Cov ntaub ntawv no tuaj yeem txhim khozaj duab xis opacity, lub zog, thiab nqi-zoo. Qee qhov kev siv cov fillers feem ntau suav nrog:
•Titanium Dioxide (TiO₂)- Muab cov xim dawb thiab UV tiv thaiv.
•Silica (SiO₂)- Txhim kho zaj duab xis lub zog thiab txo qhov kev sib txhuam ntawm qhov chaw.
•Calcium Carbonate (CaCO₃)- Txo cov nqi tsim khoom thaum tuav cov yeeb yaj kiab ncaj ncees.
Kev siv cov khoom ua kom zoo yuav pab txiav PVA zaj duab xis raudaim ntawv thov tshwj xeeb, xws li biodegradable ntim, ua liaj ua teb zaj duab xis, los yog dej-soluble hnab.
5. Surfactants - Optimizing Txheej Uniformity
Rau ib qho thiabsmooth PVA zaj duab xis txheej, surfactants yog qhov tseem ceeb. Cov tshuaj notxo qhov nro, tso cai rau cov txheej txheem kom sib npaug sib npaug ntawm qhov chaw. Cov surfactants tseem ceeb siv hauv PVA zaj duab xis ntau lawm suav nrog:
•Tsis-ionic surfactants- Txhim kho zaj duab xis ntub dej thiab dispersion.
•Anionic surfactants- Txhim kho stability thiab adhesion zog.
•Silicone-raws li surfactants- Txo qhov teeb meem ntawm qhov chaw thiab txhim kho zaj duab xis uniformity.
Kev xaiv surfactant kom zoozoo ib yam zaj duab xis thickness thiab smoothness, uas yog ib qho tseem ceeb rau cov ntawv thov uas yuav tsum tau muaj meej barrier zog.
6. Additives – Txhim khu kev ua tau zoo thiab kev ua haujlwm
Ntxivkev ua tau zoo-ntxiv additivestuaj yeem muab tso rau hauvPVA zaj duab xis txheejkom ua tau raws li cov kev cai tshwj xeeb hauv kev lag luam. Qee cov tshuaj additives muaj xws li:
•UV Stabilizers- Tiv thaiv kev degradation los ntawm tshav ntuj raug.
•Anti-blocking Agents- Tiv thaiv cov khaubncaws sab nraud povtseg ntawm zaj duab xis los ua ke thaum khaws cia.
•Antimicrobial Agents- Txhim kho cov khoom txee lub neej los ntawm inhibiting cov kab mob loj hlob.
Los ntawm ua tib zoo xaiv cov additives txoj cai, manufacturers tuaj yeemcustomize PVA zaj duab xistxhawm rau txhim kho lawv cov kev siv tau hauv ntau yam kev lag luam.
Xaus
Qhov zoo thiab kev ua haujlwm ntawmPVA zaj duab xis txheejnyob ntawm ibmeej formulation ntawm raw khoom. Los ntawm kev xaiv txoj cai ua ke ntawmPVA, plasticizers, crosslinking agents, fillers, surfactants, thiab additives, manufacturers tuaj yeem tsim cov yeeb yaj kiab nrogsuperior durability, yooj, thiab functionality.
Nrhiav cov kev daws teeb meem zoo PVA zaj duab xis?Hu rauJWELLhnub notxhawm rau tshawb nrhiav cov ntaub ntawv qib siab thiab cov txheej txheem txheej txheem tshiab raws li koj xav tau!
Post lub sij hawm: Apr-02-2025