Polyvinyl Cawv (PVA) yog ib qho tseem ceeb ntawm cov khoom siv tshuaj, siv dav hauv ntau qhov chaw- suav nrog cov khoom siv tshuaj txhua hnub, textiles, thiab kev tsim kho-vim nws cov dej tshwj xeeb-soluble zog. Nruab nrab-molecular- hnyav PVA tau tshwm sim raws li cov khoom nyiam hauv ntau daim ntawv thov kev lag luam, txawv los ntawm nws cov emulsifying zoo, thickening, thiab pwm- muaj peev xwm tiv taus, nrog rau nws cov eco- cov yam ntxwv zoo.
Cov yam ntxwv thiab cov yam ntxwv:
Polyvinyl cawv yog synthesized los ntawm hydrolysis ntawm polyvinyl acetate; Cov pab pawg hydroxyl tam sim no raws nws cov saw hlau molecular endow nws muaj zog hydrophilicity. Nruab nrab-molecular- qib hnyav (xws li 17-88 thiab 24-88) ua tiav qhov sib npaug ntawm qhov sib npaug ntawm qhov sib tov, kua viscosity, thiab zaj duab xis- tsim cov khoom los ntawm kev tswj hwm ntawm lawv cov℃ntawm polymerization thiab℃ntawm alcoholysis. Cov txheej txheem tseem ceeb suav nrog: emulsifying kev ua tau zoo (muaj peev xwm ua kom cov roj stabilizing{12}}hauv- dej tshuab); thickening efficiency (ua tiav viscosity ntawm 3000-5000 mPa·s ntawm 1% concentration); pwm-tiv thaiv kev ntsuas (validated ntawm ASTM G21 tus qauv kuaj); thiab eco-friendly cwj pwm xws li tsis muaj ntxhiab thiab yooj yim dispersible.
Kev tshuaj xyuas ntawm ntau-Scenario Applications:
Hauv kev lag luam tshuaj txhua hnub, PVA ua haujlwm zoo li emulsifying stabilizer, txhim kho cov khoom sib xws ntawm cov khoom xws li tshuaj zawv plaub hau thiab ntxuav lub cev; Tsis tas li ntawd, nws cov khoom thickening xyuas kom meej tias lub ntsej muag daim npog ntsej muag muaj qhov zoo tshaj plaws viscosity, yog li tiv thaiv dripping. Hauv kev lag luam textile, cov khoom siv no yog siv thaum lub sij hawm xov paj sizing txheej txheem los txhawb fiber ntau cohesion -leveraging nws lub zog tensile siab (nrog lub zog tawg ntawm ntau dua los yog sib npaug rau 45 MPa)-yog li txo cov xov paj tawg ntau heev. Kev tsim kho kev lag luam siv nyiaj rau PVA cov tshuaj ruaj khov, siv nws los ua cov ntawv nplaum hauv cov nplais nplaum thiab cov hmoov putty kom ntseeg tau tias kev ua haujlwm zoo ib yam thoob plaws qhov kub thiab txias, tshwj xeeb ntawm -10℃txog 40 degree.
Technical Advantages thiab Practical Performance:
Piv nrog rau cov ntaub ntawv ib txwm muaj, PVA qhia txog qhov zoo ntawm ib puag ncig zoo: nws tso tawm tsis muaj cov organic sib txuas (VOCs) thiab ua raws li GB / T 35601-2017 Green Product Standard. Hauv kev hloov kho av, PVA qhov zoo tshaj plaws dispersibility pab txhawb kev tso tawm qeeb ntawm cov chiv; Cov ntaub ntawv sim qhia tau hais tias qhov sib ntxiv ntawm tsuas yog 3% PVA rau cov av ua rau 27% nce hauv cov dej khaws cia. Hais txog kev txhawb nqa ntawv, qhov sib ntxiv ntawm tsuas yog 0.5% txaus los txhawb cov ntawv ntawv lub zog tensile los ntawm 18%, tag nrho thaum khaws cia nws cov ntawv luam tawm. Nyob rau hauv kev tsim kho daim ntawv thov, nws cov dej tsis kam (lub zog poob ntawm<15% after 72 hours of immersion) surpasses that of conventional starch-based adhesives.
Cov txheej txheem tuav thiab cov txheej txheem kev nyab xeeb:
During dissolution, the principle of "low temperature and slow addition" must be strictly observed: slowly sprinkle the powder into water maintained at 20–30°C while stirring at a speed of 150–200 rpm to prevent clumping. Storage should take place in a dry, well-ventilated environment, kept sealed to prevent moisture ingress; the typical shelf life is 24 months. Operators are required to wear dust masks and safety goggles to prevent dust inhalation. This material exhibits excellent biodegradability (degradation rate >80% nyob rau hauv 90 hnub, raws li OECD 301F tus qauv), thiab nws cov pov tseg pov tseg ua raws li kev tiv thaiv ib puag ncig.