Yam li cas PVA 1799 muaj nyob rau hauv kev siv ntawv ntaus

Exceptional Film Strength and Substrate Adhesion of PVA 1799

Hydrogen-Bond-Dominated Film Formation Mechanism

PVA 1799, yog li polyvinyl alcohol uas tau hydrolyzed zoo siab, thiab muaj 98–99% ntawm qhov kev hydrolysis, ua cov films sizing tshwj xeeb rau hauv kev sib txuas hydrogen ntawm cov molecules thiab hauv cov molecules. Cov hydroxyl groups ntawm nws yog sib txuas zoo heev thiab sib txuas raws li qhov tseem ceeb—tsis muaj cov acetate groups uas tsis zoo—thiab ua rau cov films zoo heev thiab muaj kev sib txuas zoo heev, thiab muaj tensile strength ntawm 40–80 MPa. Cov hydrogen bonds noj qab cov films no thiab tsis tuaj yeem pov tseg rau hauv qhov kev sib txuas zoo heev ntawm kev tso cov lus tshiab, xws li kev tso cov lus tshiab uas tso cov lus tshiab los ntawm projectile loss thiab rapier looms. Cov films no yuav muaj kev sib txuas zoo thiab muaj kev sib txuas zoo heev thaum sib txuas ntau dua thiab sib txuas ntau dua, thiab ua rau cov yarns tau kev sib txuas zoo heev. Yog li ntawd, cov loom stops thiab cov weaving defects yuav nyob deb heev rau hauv cov loom tshiab.

Kev sib txuas zoo heev rau hauv cotton, polyester, thiab cov yarns uas sib txuas

Qhov qhia tshaj plaws uas muaj hydroxyl ntau thiab qhov kev ua haujlwm ntawm cov ntaub ntawv kuj qhia tias nws muaj kev nyab xeeb rau lub tshuab ntawm cov ntaub ntawv. PVA 1799 ua kev sib sau rau cov cellulose ntawm cotton thiab ua kev sib sau rau cov polyester ester groups—thiab nws tau txais lub npe “sib sau siab heev” uas yog siab dua li cov ntaub ntawv uas tsis tau sib sau ntau. Rau cov cotton warps, nws khiav mus rau hauv cov fibers thiab sau rau cov fiber fibrils, uas yog qhov ua rau cov yarn muaj kev nyab xeeb rau kev rub tshem dua ob zaug. Rau cov polyester thiab cov cotton-polyester blends, nws sau rau cov fibers uas tsis sib thag, uas tshem cov size shedding thaum weaving. Qhov sau rau no muaj kev nyab xeeb thiab tsis tuaj yeem tshem tawm los ntawm kev rub tshem ntawm cov yarn, uas tshem cov hairiness thiab filament breakage. Tsis tas li, kev tshem cov size yuav tsum siv dej cua sov (>90 °C) vim tias cov film yog nyab xeeb heev, tab sis qhov tshwj xeeb yog: loom efficiency yuav nce 12–18% rau cotton thiab nce 15% rau cov blended warps—thiab yog li no, PVA 1799 yog qhov standard rau kev tsim cov fabric uas tsis muaj qhov tsis zoo thiab muaj kev nyab xeeb heev.

Kev tswj hwm zoo thiab kev tswj hwm ntau ntawm qhov cua sov rau kev tsim kho los ntawm kev siv tau zoo

Kev tshuaj ntsuag ntau ntawm dej yeeb nkaus yog ua rau kev siv tau ntau thiab kev tawm tsis tau

PVA 1799 muaj qhov kev tshuaj ntsuag (tshwj xeeb yog 86–89 mol%) uas tswj hwm zoo ntawm cov kab mob tshuaj ntsuag thiab cov kab mob tshuaj ntsuag tsis tshua muaj. Cov kab mob no yog ua rau kev tshuaj ntsuag ntau thiab tshwj xeeb ntawm dej yeeb nkaus hauv 30 feeb thaum muaj dej tshuaj ntsuag ntau—tsis txhob siv dej sov lossis dej sov hauv cov dej sov. Yog li ntawd, PVA uas tshuaj ntsuag ntau yuav tsum siv dej sov 90 °C thiab siv ntau zaus, tab sis PVA 1799 no tsis txhob siv dej sov, yog li nws txhob siv tau ntau 35% (Textile Research Journal, 2022) thiab txhob siv tau carbon. Nws kuj txhob siv tau kev tawm tsis tau: kev tshuaj ntsuag tuaj yeem tshuaj ntsuag nyob rau hauv lub tshuaj ntsuag thiab tsis txhob tawm tsis tau hauv lub tshuaj ntsuag sov thaum tshuaj ntsuag tawm tsis tau. Kev tshuaj ntsuag thaum tshuaj ntsuag tshwj xeeb yog tshuaj ntsuag ntau—tsis txhob siv cov khoom tshuaj ntsuag tshwj xeeb—thiab txhob siv tau kev tawm tsis tau 50%. Qhov kev tswj hwm no yog qhov tshwj xeeb rau kev tshuaj ntsuag tshwj xeeb thiab kev tshuaj ntsuag tshwj xeeb.

Kev tswj hwm ntawm qhov cua sov txog 220 °C paub tias yuav pab rau kev ua haujlwm ntawm loom nyob hauv qhov kev ua haujlwm ntev

PVA 1799 muaj kev tswj hwm ntawm lub duab thiab tsis muaj kev puas tsuaj los ntawm qhov cua sov uas muaj nyob hauv kev ua haujlwm ntawm loom ntev. Kev ua haujlwm ntawm qhov cua sov (Thermogravimetric analysis) paub tias qhov cua sov yuav tsis muaj kev puas tsuaj ntau dua 220 °C nyob hauv cua—ntawd yog qhov sov ntau dua qhov cua sov uas muaj nyob hauv qhov chaw sib sau ntawm size thiab reed, tsaug rau kev ua haujlwm ntawm loom uas muaj projectile lossis rapier uas ua haujlwm nyob hauv 700 rpm. Qhov cua sov ntau no yuav pab tswj hwm kev tsis muaj kev sov, kev tawg, lossis kev tshuaj, thiab pab tswj hwm cov yarn thiaj li muaj kev npaj nyob hauv qhov shed cycle—tsaum nyob hauv kev siv ntau tshaj plaws li cov polyester filament fabrics uas muaj kev siv ntau. Yog li ntawd, kev ua haujlwm ntawm loom yuav muaj kev ua haujlwm zoo dua 92% txhua yam, tsis xav tau siv cov spray uas pab tswj hwm qhov cua sov lossis tshem tawm qhov kev ua haujlwm ntev. Kev ua haujlwm nyob hauv mill tau paub tias muaj kev sib sau ntau ntawm qhov cua sov thiab qhov kev tshem tawm ntawm warp stops per million picks, thiab kev ua haujlwm ntawm fabric finish tom qab desizing.

Kev ua haujlwm ntawm rheology uas muaj kev paub thiab kev ua haujlwm ntawm low-foam nyob hauv cov bath uas muaj kev ntxiv ntau

PVA 1799 muaj kev tswj hwm cov khoom siv uas muaj kev tswj hwm zoo li Newton nyob rau hauv qhov siab ntawm kev tswj hwm qhov ntau ntawm cov khoom siv—ib qho yuav tsum tau txais tias nws yog qhov zoo dua li cov khoom siv ntawm lub ntiaj teb thiab cov khoom siv siv los ntawm lub tsev uas muaj kev tswj hwm tsis zoo li Newton thiab muaj kev tswj hwm nyob rau hauv qhov ntau ntawm cov khoom siv. Qhov stability no pab tswj hwm qhov ntau ntawm cov khoom siv raws li qhov tseeb, tab sis tso cai rau qhov ntau ntawm cov khoom siv (12–15% w/w), uas yog qhov tseem ceeb rau kev tswj hwm lub tsev uas tswj hwm ntau. Cov tsev siv khoom siv tsis tau txais kev tswj hwm qhov ntau ntawm cov khoom siv, uas yog qhov ua rau cov khoom siv tsis zoo thiab ua rau cov khoom siv puas—ib qho uas ua rau cov tsev siv khoom siv ntau tau loss $180,000 ib xyoo rau kev tso cai thiab kev siv khoom siv (Textile Process Benchmarking, 2023).

Nws muaj kev tswj hwm qhov ntau ntawm cov khoom siv uas muaj kev tswj hwm ntau dua li qhov tseeb, uas ua rau cov acetyl groups thiab cov khoom siv uas muaj kev tswj hwm ntau dua li qhov tseeb tsis tau txais kev tswj hwm, uas ua rau cov khoom siv tsis muaj kev tswj hwm ntau dua li qhov tseeb. Tsis li cov khoom siv uas muaj starch—uas muaj kev tswj hwm ntau dua li qhov tseeb uas ua rau cov khoom siv tsis muaj kev tswj hwm ntau dua li qhov tseeb—cov khoom siv PVA 1799 muaj kev tswj hwm zoo thiab muaj kev tswj hwm ntau dua li qhov tseeb. Nyob rau hauv cov khoom siv 10% w/w zoo li qhov tseeb, PVA 1799 muaj kev tswj hwm zoo dua li qhov tseeb:

Tshem cov dej uas tshuab los thiab cov kev ua haujlwm uas tsum ua dua li ua ntej yuav pab tshem qhov kev ua haujlwm tsis zoo thiab ua kom ntau dua li ua ntej. Qhov kev tshuab los uas muaj qhov zoo yuav pab tshem qhov kev ua haujlwm ntawm cov dej thiab cov kev tshuab los—pab tshem qhov kev ua haujlwm tsis zoo thiab ua kom muaj qhov kev ua haujlwm zoo heev rau kev tsim kho tshuab los.

Qhov zoo ntawm PVA 1799 rau kev tswj hwm thiab rau kev tswj hwm ntawm cov lus qhia

Qhov tswj hwm rau kev tshuab los (OECD 301B) vs. Cov lus qhia uas tshuab los

PVA 1799 tuaj yeem tshuam ntau dua 90% ntawm kev tshuam pov tseg rau hauv 28 hnub nyob rau hauv OECD 301B kev tshuam, thiab pov tseg mus rau hauv CO₂ thiab dej tsis muaj kev tshuam pov tseg ntau dua (2023 Textile Chemical Consortium data). Tsis txaus li ntawd, cov khoom siv sib thos uas tau siv dav—piv txwv li cov khoom siv acrylate thiab cov khoom siv polyester—tsis tuaj yeem pov tseg rau hauv qhov chaw thiab yuav tsum siv kev tshuam ntau dua los yog kev tshuam pov tseg rau hauv dej los yog kev tshuam pov tseg rau hauv qhov chaw tshuam pov tseg. Qhov kev sib xws zoo ntawm no yog qhov tshuaj tshuaj uas pab rau kev sib xws zoo ntawm ZDHC MRSL, EU Ecolabel, thiab REACH, uas pab rau cov khoom siv kev tshuam pov tseg los yog kev tshuam pov tseg rau hauv qhov chaw tshuam pov tseg, txo kev tshuam pov tseg rau hauv qhov chaw thiab pab rau cov khoom siv kev tshuam pov tseg los yog kev tshuam pov tseg rau hauv qhov chaw tshuam pov tseg—tsis txaus li ntawd, tsis muaj kev tshuam pov tseg rau hauv qhov chaw thiab tsis muaj kev tshuam pov tseg rau hauv qhov chaw.

Qhia Tswv Yim

Dab tsi yog qhov kev ua haujlwm uas pab PVA 1799 muaj kev nyab xeeb?

Kev nyab xeeb ntawm PVA 1799 yog los ntawm qhov kev sib xws zoo ntawm cov hydrogen bonds uas ua rau muaj qhov kev sib xws zoo thiab muaj qhov kev sib xws zoo ntawm cov khoom siv.

Lub PVA 1799 yog dab tsi uas pab nws muaj kev sib xws zoo rau hauv cov khoom siv cotton, polyester, thiab cov khoom siv sib xws?

Nws qhov kev ua haujlwm ntawm hydroxyl yog ua rau nws muaj hydrogen bonds thiab dipole interactions rau cotton cellulose thiab polyester ester groups, uas tso cai rau nws tau txais kev nyuaj siab los ntawm cov khoom no.

PVA 1799 yuav tsum ua li cas los ntawm dej?

Los ntawm nws alcoholysis degree, PVA 1799 yuav tsum ua li cas los ntawm dej ntuj, uas tsis xav tau kev sov ntev.

PVA 1799 muaj kev nyuaj siab li cas rau kev sov?

PVA 1799 muaj kev nyuaj siab los ntawm 220 °C, uas tso cai rau nws tau txais kev sov ntev thiab tsis tuaj yeem tawg los ntawm kev sov ntev.

PVA 1799 yog qhov nyuaj siab rau lub zog thiab cov khoom?

Yog, PVA 1799 yog ntau dua 90% los ntawm OECD 301B standards, uas tso cai rau nws tau txais kev tawg los ntawm CO₂ thiab dej, thiab tsis muaj kev tawg los ntawm microplastics.