PVA 1788 rau cov kab ntsa tshuaj txhuas meej thiab kev sib chig nyob rau hauv daim ntawv

Qhov ceev ntawm PVA 1788 rau kev ntxuav kab ntsa thiab txhim kho zog rau kab ntsa tshuaj txhuas

PVA 1788 yog ib qhov tseemcees rau kev ntxuav lo rau lo roj kom nyob deb ntawm cov hmoob sib thooj, vim nws ua haujlwm zoo los ntxuav kho rau cov hmoob cellulose. Lub molejul muaj ntau lub vaj huam sib luag hydroxyl uas txhais tau tias nws tuaj yeem tsim cov khoom sib xyaw hydrogen nrog ob qho khoom kho rau lo thiab lub khoom lo tseem ceeb. Qhov no tsim ib qho saum npoo uas tsis yog qhov chaw tawm mus thaum siv. Txog tam sim no los ntawm ib co kev soj ntsuam los ntawm PaperTech Insights xyoo ntawm, PVA txo cov teeb meem ntxuav lo roj los ntawm li 34% dhau ntawm cov khoom starch tshaib. Qhov no ua rau muaj qhov cuam tshuam loj rau cov khaub ncaws uas xav kom lawv cov khoom zoo dua thiab sau sai dua tsis muaj cov teeb meem tawm.

Kev Tsim Film Zoo dua thiab Kev Raug Siab ntawm Saum PVA 1788

PVA 1788 cov kab ntsug linear polymer feem ntau tshuav tshaib hauv kawg ntawm kev siv qhuv, txawm li cas los xij muaj cov duab nrog roughness tsawg dua 0.5 µm. Cov duab uas siv PVA 1788 tau 27% siab dua li cov duab acrylic-modified, pab rau cov duab zoo dua thiab yooj yim rau kev sau npe tshaj tawm. Qhov kho duab no nyiam ink bleed tab sis tsis muab substrate breathability.

PVA 1788 thiab kev sib raug zoo ntawm cov khoom siv rau coating slurry

PVA 1788 sib cuag zoo nrog cov khoom siv slurry tseem ceeb, pab txhim kho nyob rau hauv daim duab:

Qhov sib phim no txo rau tus tsim khoom kom muaj kev nyab xeeb hauv qhov sib thooj tsis pub tshem tshem qhov tseem ceeb ntawm kev sov.

PVA 1788 vs. Alternative Binders: Qhov zoo dua hauv kev siv roj sib thooj

Sib raug siab nrog lwm yam khoom sib thooj, PVA 1788 muaj qhov zoo tshwj tsis:

• 43% ntev dua rau kev sov sib raug nrog cov system uas tsim los ntawm casein nyob rau hauv qhov sib npaug ntawm kev siv roj
• 2.3x tso tseg VOC tsawg dua txhees tiv taus cov polyurethanes uas muaj solvent
• muaj kev nyob siab dua 18% nyob rau hauv qhov chaw sib nqum nrog dej ntsim txo rau styrene-butadiene latex

Cov phiaj xwm no ua rau PVA 1788 yog qhov kho tshaj plaws rau cov duts ntawv soj ntsuam uas xav tau 5% coating porosity.

Txhim kho kev nyob siab rau dej thiab kev tiv thaiv dej

Cov caij rooj meej ntawm PVA 1788 nyob rau hauv cov duts ntawv siv rooj rau kev nyob siab rau dej

Qhov chaw sib twg kawg los ntawm PVA 1788 tsis pub dej nkag mus. Nws cov hydroxyl groups sib thooj nrog cellulose fibers, tsim ib qhov network nyiag uas hloov qhov loj ntawm pores los ntawm 83% ntawm duts ntawv tsis siv (PaperTech Institute 2023). Qhov chaw no tso cai rau kev nthuav dav feem ntau tab sis tiv thaiv kev nkag tej yam uas muaj dej—yog yam tseemceeb rau cov duts siv rau hauv qhov chaw muaj dej nphoom nphua.

Qhov kev sib thooj ntawm PVA 1788 thaum siv dej los txhim kho kev nyob siab rau dej

Thaum kheev txog 60–80°C thaum siv, PVA 1788 tuaj yeem tshwm sim kev sib poob thiab rov sau ua ke los nyob rau hauv qhov chaw uas tsis muaj nyias ntau, uas muaj angles sib cuag txog 112°C—38% siab dua starch-based binders (Material Science Quarterly 2023). Qhov kev hloov no pab ntxiv kev tiv thaiv kom tsis muaj dej ntau, thaum tsis txav kev zoo nkauj nkauj, tiv thaiv kom tsis txhaum thaum npoo lossis tshwm.

PVA 1788 nyob rau hauv duv xaum: Ntxiv kev tiv thaiv kom tsis muaj dej rau cov khoom siv

Nyob rau hauv cov duv sib txuas ntau, PVA 1788 ua haujlwm li adhesive thiab tsev tiv thaiv dej. Ib lub duv 12μm tshwj tsis tau WVTR (water vapor transmission rates) los ntawm 92% kom compared to acrylic alternatives (Packaging Materials Review 2024). Nws zoo sib xws nrog polyethylene thiab aluminum foil layers, pab tiv thaiv zoo dua, ntxiv sijhawm nyob rau khoom no tsau txom ntau dua 18 hlis.

Daim piv txwv: Cov kev daws teeb meem rau khoom siv khoom uas muaj kev tiv thaiv dej zoo dua siv PVA 1788

Ib qhov chaw tsim khob noj thiab nyiam tau pom kev pib txawv teev thaum lawv hloov mus siv cov khoom siv los nruab npav rau PVA 1788, uas tau muab tso rau hauv qhov chaw kub siab heev thiab muaj 99.5% qhov chaw tso dej nyob hauv npav. Khiav tsov saum lub sijhawm 90 hnub nyob hauv qhov chaw kub siab tshaj plaws ntawm 85% chaw tso dej, tsuas yog 0.3% lo lwm tom qab 90 hnub, uas yog li 70% zoo dua li cov khoom nruab npav EVOH dhau los raws li qhov tshwm sim hauv daim duab ntaub ntawv cuam tshuam khob noj thiab nyiam xyoo 2024. Qhov tseem ceeb tshaj plaws yog tias cov npav tshiab no ua haujlwm zoo npaum li cas thaum nws tau ncav qhov kub txias, ntawm -20 degrees Celsius txog 50 degrees Celsius. Qhov tseem ceeb no txhais tau hais tias khob noj thiab nyiam tuaj yeem dhau los ntawm ib cheeb tsam mus rau ib cheeb tsam hauv ntiaj teb thiaj li tsis tas xav txog kev phom sij lossis hloov pauv nyob hauv kev nres tseg lossis khiav tsov.

Txhim kho Qhov Tshua Dab Duaj Thiab Qhov Nyob Ntev

Ntxiv Qhov Tshua Dab Duaj Thiab Qhov Tshuaj Xeeb Hauv PVA 1788-Nruab Lub Rog

Thaum siv rau cov khoom tsim los ntawm daim ntawv, PVA 1788 ua haujlwm los tswj ntau yam polymer nyob rau hauv qhov khoom uas pab txuas ntev tus zog mekhanik thaum muab zog. Qhov dab tsi ua rau chav no ua haujlwm zoo heev? Nws muaj ob yam: ib qhov heav molecular weight thiab ntau hydroxyl groups uas kuaj xyuas ntau nrog cellulose fibers nyob rau hauv daim ntawv. Txhawm rau txheeb xyuas los ntawm Industrial Coating Studies hais tias nyob li xyoo 2023, qhov no cuam tshuam mus rau ib thiaj pib txoj kev ntxig ntau dua li ib feem pib ntawm qhov peb tau los ntawm starch-based binders. Thiab lub ntsiab lus? Ib daim film uas tsis tuaj yeem xeev tab sis tsis yog yuav ruaj ruaj ntau. Qhov no muaj tseeb txaus siab rau cov khaub ncaws uas tsim khoom nyob rau hauv cheeb tsam vim nws txhawv mus rau fewer tears thiab breakdowns hauv kev tsim khoom.

Kev Kuaj Xyuas Ntawm Internal Bonding Thiab Layer Adhesion Los ntawm PVA 1788

Kev sib txuas hydrogen ntawm PVA 1788 thiab cov kab rau tshuab tuaj yeem pab ntxiv kev sib xyaw siab npaum li 15–25% hauv cov duv uas tau sau los. Qhov no pab tiv thaiv kev raug chaws tawm hauv cov duv muaj ntau sab, thaum twg kuj tso cai kom muaj kev nqus dua. Lub binder muaj kev nytsuas viscosity uas pab nws nkag mus rau hauv qhov chaw poob ntsuas tau zoo tsis tas yam ntau.

Kev tiv thaiv dhau lub sijhawm thiab kev nytsuas siab ntawm cov khoom siv PVA 1788

Nyob rau hauv qhov chaw ua kom dhau lub sijhawm (85% RH, 40°C), duv uas muaj PVA 1788 sau lossis tau txo 92% ntawm qhov nqus nqaij tshiab tom qib 12 xyoos—30% zoo dua li cov sib npaug acrylic. Cov crystalline ntawm nws tiv thaiv kev plasticization nyob rau hauv kev chwntxwv, thiab qhov backbone uas tsim nyog rau UV tiv thaiv kev puav tseg nyob rau hauv kev siv ntawm ntuj siab.

Kev ua haujlwm meej pem thiab cov phiaj xwm zoo rau kev siv hauv tshuab

Kev sib luag thiab kev meej pem ntawm PVA 1788 hauv cov system coating sib npoo

PVA 1788 sib txuas ntau tshaj rau hnyav nyob rau hnyav, thiab sib txuas tas li hauv 15 feeb tom qab tiam ntuj tuaj txog li 20°C. Lub thawj uas tsim los muaj kev sib dhos tsawg heev, feem ntau saum 50 cP, uas yog li cas los xaus tau qhov kev ua haujlwm zoo dua li PVOH tshwj tsis txaus plaws hauv qhov chaw tsim khoom. Qhov tseem ceeb tshaj plaws ntawm cov khoom no yog nws pab tsim tau cov slurry uas muaj 15-25% yam khoom nyob rau hnyav thaum ntxiv tso cov pigment txaus siab rau hnyav. Cov kev sim tshuaj xyuas uas tau muab tshuaj xyuas tau piav tias cov chaw tsim khoom uas hloov mus siv PVA 1788 tau pom tias lawv tus nqi siv hluav taws xob hlo li 18%. Cov neeg siv kuj tsis tas hloov kho ntau li 40% kom nrawm dua li cov khoom siv ua ntej, vim tias lawv tau txhawj xeeb ntau dua hauv kev sib txuas (viscosities) uas nyob rau 500-800 mPa s.

Zoo dua kev nres kho thiab lwm yam kev sib txuas nrog PVA 1788

PVA 1788 tau txoj kev hydrolysis ntawm li 87 mus 89 hli, thiab los ntawm nws qhov chaw tsis muaj kab ntsug, nws sib raug zoo meem nrog calcium ions nyob rau hauv cov roj teeb roj uas tuaj meem. Qhov no txhais tau tias muaj meej ntau dua li 60 hli ntawm kev pheev xwm nyom rau hauv kev tsim kho tshuab rau lawv cov sijhawm ntev 72 teev. Thaum cov coating muaj PVA 1788 ntxiv tshaj li 5 mus 8 hli, lawv tso cai rau tshuab tsim kho nqa ntev ntau dua li 22 hli kom nqa ntev dhau rau cov tshuab starch feem ntau thaum tsim kho coat weight zoo ib yam rau hauv 10,000 meter tsim kho, thiab muaj kev hlo li 2 hli lossis tsawg dua li ntawd tshaj li tag nrho lub sijhawm. Qhov kev tso tseg ntawm cov khoom no tiv thaiv kev ntxig tso caij nce ntau dua li 3 mus 5 zaug kom nce ntau dua li thaum ua ntej. Thiab qhov no txhais tau tias tau txo ntau ntxiv rau kev lag luam, txo ntau dua li 4 dola thiab 20 naj npawb rau ib pa nyiaj ntawm cov duab pap muaj coating raw theem TAPPI efficiency studies piav los ntawm 2024.

Kev nyob ruaj khov, kev nyob tseemceeb, thiab kev ua raws lwm ntawm PVA 1788

Qhov txheej xeeb rau hauv environment thiab qhov yooj yim siv huv los ntawm PVA 1788 hauv cov ntaub ntawv

PVA 1788 pab tau rau kev nyob ruaj khov los ntawm qhov yooj yim huv ntau yam ntxiv hauv chav siv kom huv. Kev test ua ntej OECD 301B pom zoo 72% ntawm kev huv hauv 90 hnub (kev xaub zog ntawm 2023), zoo dua cov binder uas tsis yog los ntawm petrochemical. Txawv npaum li cas li systems styrene-acrylic, nws huv los ntawm enzymes mus rau hauv dej thiab CO₂, txo qhov ceev tshuab tso tawm microplastic. Cov chav siv pom 18–22% txo hauv tus nqi coating uas tsum tso rau hauv landfill thaum hloov mus rau PVA 1788.

Ua raws lwm rau cov kev tswj xyuas nyob rau hauv menyuam thiab cov kev tswj xyuas nyob ntawm lub ntiaj teb

PVA 1788 muaj qhov chas GRAS los ntawm FDA, uas pheej xwm sau rau Generally Recognized As Safe. Qhov no txhais tau tias nws txiav txim siab rau cov kev cai ntawm FDA 21 CFR §175.300 thaum siv rau kev sib cuag yooj yim nrog dej nkauj los ntawm luv lwb. Siv cov khoom no ua rau nws txwv tsis pub tshwm sim yog tias nws tsis muaj dab tsi plasticizers tuab, thiab ntau yam khoom sib xws kuj muaj. Cov monomer vinyl acetate residual nyob saum npoo 0.1 parts per million, nyob hauv lub cheeb tsam kuaj mob zoo tshaj plaws uas EU Regulation 10/2011 tau tso tseg txog tus leej twg tuaj yeem tshwm sim rau hauv dej nkauj. Cov neeg kuaj xyuas sib sau tseem tau soj ntsuam tag nrho. Lawv tau muab tso cai tias PVA 1788 txiav txim siab rau kev cai REACH hauv Yurob thiab compatible rau Japan's Positive List standards rau cov luv lwb coating uas sib cuag dej nkauj. Cov tso cai no txiav txim siab tias cov neeg tsim khoom tuaj yeem siv luv lwb rau kev saum npoo khoom tsha tshaj txaus tshiab hauv lub ntiaj teb tsis tas worry txog kev tshwm sim ntawm kem zoo li cas.

FAQ

Yog vim li cas PVA 1788 txwv tsis pub tshwm sim raws binder rau cov luv lwb coating?

PVA 1788 yog qhov tseem ceeb rau nws kev ua haujlwm zoo, txheej mus zoo, kuaj tsuag siab, thiab tsawg tuag rau hauv qab ntawm VOC. Nws muaj qhav tshiaj, zog mekanik, thiab kev tiv thaiv rau dej, uas ua rau nws zoo tagnrho rau kev tsim kho tsoom.

PVA 1788 ua li cas kom zoo dua rau kev tiv thaiv dej hauv tsoom muaj sab nraud?

Qhov chaw kis tseem ceeb ntawm PVA 1788 nyob qhov chaw tsawg dej nkag mus. Qhov kis nyob hluav taws xob thaum kuaj tsuag tso ntau dua kev tiv thaiv rau dej los ntawm kev tsim qhov chaw muaj qhov sib txig siab dua, uas pab txhim kho kev tiv thaiv rau dej.

Puas yog PVA 1788 zoo rau ntiaj teb?

Yog, PVA 1788 pab txhim kho kev nyob zoo rau ntiaj teb los ntawm kev sib txuam nrog dab tsi thiab kev tsawg dej tshuag rau hauv qab nyob hauv kev tsim kho tsoom. Nws raug chawb thiab dej thiab CO₂, uas txhim kho kev tsawg dej tshuag rau hauv qab.

Puas yog PVA 1788 zoo rau kev saum lub nplua nplai?

Txoj cai, PVA 1788 txhob xyuas tias nws tuaj to taub rau kev nyob zoo hauv chaw ua menyuam khoob, yog li nws tsim nyog rau kev siv rau kev sau nrog tshuab. Qhov GRAS, kheev meej meej, thiab tsis muaj plasticizers tso kom meej tias nws nyob zoo hauv kev sau nrog tshuab.