VAE Emulsion rau kev sib tw zoo ntawm cov ntaub ntawv thiab cov ntaub ntawv tshuaj

Yuam li cas VAE Emulsion Zoo dua rau Kev Ntxig Multisubstrate

Qhov Keel Tso Tseg: Yuam li cas VAE Tsom Tauj Txoj Kab Ua Ntawm Cellulosic Thiab Synthetic Films

VAE emulsion yog qhov tso cai uas muaj kev nyuaj rau lub zog ntawm ntau qhov chaw los ntawm qhov kev saib xyuas ntawm nws cov molecules. Ethylene hauv qhov tso cai ua rau cov polymer chains yuav mov hauv qhov chaw ntau dua, thiab qhov no pab lawv mus rau hauv cov khoom uas muaj qhov txiag nyob hauv kraft paper. Thaum siv rau cov chaw uas muaj qhov puag ncig zoo li PET plastic, cov ethylene yuav ua haujlwm nyob rau qhov kev nyuaj ntau dua—lawv nyuaj tau los ntawm kev nyuaj ntawm qhov tso cai thiab kev nyuaj ntawm qhov chaw. Qhov kev nyuaj ob qhov no ua rau muaj kev nyuaj zoo rau ntau qhov khoom. Cov lus test pom tias VAE yuav nyuaj rau cov chaw ntau dua li 25% vim tias nws nyuaj rau cov chaw zoo li qhov kev nyuaj ntawm cov adhesive tshwj xeeb raws li cov kev nyuaj ntawm tsev tsheb los ntawm 2023. Qhov zoo tshaj plaws yog tias nws yuav nyuaj rau cov chaw thaum ib leeg thiab tsis ua rau cov film uas muaj kev nyuaj rau qhov ceev, vim tias nws yog qhov water mixed with polymers uas tsis tuaj yeem rov qhia rau hauv qhov kev siv.

Daim ntawv sau ntaub ntawv txog kev sib piv: VAE vs. PVA thiab Acrylic Emulsions nyob rau hauv kev nyiaj ib tug thiab kev txaus siab rau kub

Emulsion VAE zoo dua polyvinyl alcohol (PVA) thiab lwm yam acrylic nyob rau hauv qhov chaw tsim khoom siv los ua ke:

Ntaub ntawv: ASTM D903 & TAPPI T 549 (2023)

Cov cuab yeej plasticizing ntawm ethylene pab tswj xyuas kev nyiaj ib tug zoo tom qab sawv cev rooj kub. Cov kev soj ntsuam pom tias muaj peb xaus ntawm yam tsis hlo li cov tsis muaj ethylene thaum muaj kev soj ntsuam txheej txheem ntau dua. Thaum nrhiav PVA thiab VAE, VAE yog qhov zoo dua vim nws muaj qhov chaw tiv thaiv tsis pub rooj kho tshuaj kom mus rau hauv vaj. Tom qab ntawd, VAE tuaj yeem rov sau ua dua tas li uas yog qhov tseem ceeb rau kev tso khoom tshuaj tshiab uas xav tau kom dhau kev tswj xyuas tshwj tsis nyob tam sim no rau kev sib piv rov qab.

Sib npaug Qhov Chaw Tiv Thaiv Ntsha Thiab Kev Sau Roj Kom Muaj Pej Xwm Nyob Rau Hauv Siam VAE

Rabthi Vinyl Acetate–Ethylene yog li qhov kev siv rau kev txhim kho qhov tsis tshuaj ntsuab thiab qhov kev ua dua

Thaum pib mus txog kev tsim los ntawm kev sib xyaw, tus nqi ntawm vinyl acetate rau ethylene yog qhov kho tshwj tsis uas cov neeg tsim khoom siv. Qhov sib piv no txiav txim siab tias yam khoom tuaj yeem tiv thaiv dej zoo li cas lossis yuav tsum tau muab tshem tseg li cas. Ntau dua vinyl acetate yog li yuav ua rau yam khoom hloov los cuam tshuaj rau dej thiab yooj yim dua kom rov muaj dej, uas pab yam khoom kom dhau los raws li khiav rau kev rov qhia khoom rau daim ntawv. Tom qab ntawv, rov muab ethylene ntau dua yog li yuav tsim tau ib chaw tiv thaiv dej uas tso cai kom zoo dua nyob rau hauv qhov chaw muaj dej lossis chaw muaj dej ntau. Ib tug neeg tsim khoom feem ntau siv txhua 60 lub vinyl acetate rau 40 lub ethylene vim nws tsim nyog rau ntau hom kev sim. Cov khoom tsim los ntawm qhov no feem ntau dhau kev sim dej tso (ISO 62) thaum twg tseem dhau kev xwm txheej rov qhia khoom, rov qhia dua 85% ntawm cov duab ntawv nyob rau hauv kev rov qhia khoom tiag tiag. Cov neeg kawm kho qhov no nrog kev xaum nyob rau hauv yam khoom xwb, txiav txim tias txhua yam nyob ib ncig zoo hauv kev tsim khoom thiab txiav txim tias txaus lub xwm txheej tseem ceeb.

Thaum Siab Txog Kev Nyob Tib Neeg Nyob Hauv Qhov Chaw Nyob: Kev Tsoom Toj, Kev Tiv Thaiv Kab Siab, thiab Kev Tshwm Sim Txoj Cai

Cov Ntaub Nkhaus Ethylene Yog Li Nthlwm Kev Txav Ntawm Kev Txav thiab Kev Tiv Thaiv Kev Ua Hneb (ASTM D412 & TAPPI T 549 Cov Ntaub Nkhaus)

Qhov ntau ntawm ethylene nyob rau hauv cov khoom VAE tshwm sim ntawm 15% thiab 25% los ntawm qhov loj ntawm cov khoom, thiab qhov no yog qhov cuam tshuam rau qhov kev siv cov khoom no rau lub cev thiab qhov cua txias. Yog tias muaj ethylene ntau dua, cov polymer chains yuav ncaj qha ntau dua, uas txhais tau tias cov khoom yuav tuaj yeem kub ntau dua li cov khoom vinyl acetate tshwj xeeb raws li cov kev txheeb xyuas ASTM D412. Qhov kub ntau no pab tshem tawm qhov khaub ncaws tsis tau kub kom ntxiv dua thaum cov khoom tau kub ntau dua, tau txais qhov tshav ntau dua, lossis tau kub ntau dua. Ethylene ua hais tias nws yog ib qho plasticizer rau hauv, uas pab txo qhov uas hu ua "glass transition temperature" (Tg) kom cov khoom yuav muaj kev ncaj qha thiab tsis tuaj yeem kub ntau dua thaum cua txias. Cov kev txheeb xyuas raws li TAPPI T 549 qhia tias VAE tuaj yeem tswj cov qhov loj thiab qhov ntsiab ntawm nws nyob rau hauv qhov cua txias li -20 degrees Celsius thaum muaj qhov ntsuas txog qhov ntsiab ntau dua, uas yog qhov ua rau nws tuaj yeem siv zoo rau kev kho cov khoom uas muaj cua txias. Thaum muaj qhov cua ntawm -30 thiab 80 degrees Celsius, VAE tuaj yeem ua haujlwm zoo thiab tsis tuaj yeem kub ntau dua, tsis tuaj yeem tshem tawm, lossis tsis tuaj yeem tshem tawm qhov kev tswj.

Kwntsim VAE Emulsion rau kev ntxig tseemceeb tawm hluas nrog lwm hom tshuab ua haujlwm ntau

Puv kws txheej: Ntxig tseemceeb Gravure-laminating Metallized PET rau hauv paus Kraft ntawm 400 m/min thiab tsis muaj qhov chaws tawm

Ib qhov chaw tsim khoob ntau tshuab tau txhawb ntxuav ib qhov cuab yeej loj txaus siab los ntawm kev tsis muaj teeb meem dab tsi txog kev sib tso tawm ntawm metallized PET rau hauv duv kraft nyob rau hauv cheeb tsheej txog 400 meters per minute nrog VAE emulsion. Lawv kev tsim khoob tau sau ib qhov kub uas tshwm sim li 3.8 grams per square meter los ntawm ib qhov cylinder 12-micron, thaum twg kuj tswj xyoj duab roller rau 50 degrees Celsius. Thaum sawv tshuaj tom qab 72-teev ntawm kev npuav tshai ua ntej raws TAPPI T 549 standards, qhov zav sib xyaw nyob deb 98%, tshaj tshuaj txaus nyob zeeg tshwj tsis tag li 20%. Qhov twg yog qhov pab tau li cas? Qhov VAE formulation tau tsim tawm qhov zav ntxuav tshiab tshaj plaws thiab muaj cov khoom siv tshuaj shear-thinning uas pab nws dhau mus smoothly txhua yam thaum cheeb tsheej loj tsis muaj teeb meem. Lawv kuj tau txhim kho zoo siab dua, txhim kho ethylene content rau 17% kom zoo dua rau kev siv nyob rau hauv qhov chaw tsa ntxiv thiab tswj viscosity rau 1,200 cP kom tsis txhob muaj teeb meem xws li edge bleeding lossis spidering effects. Tom qab ntawd, kev mus rau VOC-free tau pab lawv tau txais green strength tshaj tawm thawj zaug, tso cai kom txhim kho nyob rau 35% tshaj li cov tshuab siv solvent feem ntau.

Qhov tseem ceeb ntawm kev ua haujlwm: Qhov sib txuas, qhov kev tswj hwm, thiab qhov ntsuas qhov cua sov rau VAE

Pej yaum qhov tseem ceeb uas sib pheej xwm tshooj tsis tau los ntawm VAE yog:

1. Sai sai (daim ntawv zoo tshaj plaws: 1.5–2.5 xyoo): YUAV tso cai rau cov khoom sib txuas tau txais ntau dua thiab tsis txhob muaj kev sib txuas tshiab ua ntej thaum yuav tau; txhob txhij 3 xyoo yuav cuam tshuam rau kev sib txuas thiab kev sib txuas tsis zoo
2. Qhov kev tswj hwm (≤0.8 xyoo nyob rau hauv 400 m/min): YUAV tswj hwm qhov kev sib txuas zoo tshaj plaws rau kev txhawb qhov kev tswj hwm thiab txhob muaj kev sib txuas
3. Qhov cua sov ntawm rola (50–80°C): Tshooj tsis tau qhov viscosity thiab kev sib txuas—±5°C yuav cuam tshuam rau kev sib txuas 40%

Kuam ntsuas tias qhov kev ua haujlwm yog qhov tseem ceeb rau kev txiav txim siab qhov zoo tshaj plaws ntawm cov khoom sib txawv. Yog tias muaj ntau dua ethylene hauv qhov kev txiav txim, nws yuav muab cia cov khoom nyob hauv qhov ntsuas ntev dua, tab sis nws kuj yuav ua rau cov khoom kuaj tau ntev dua, thiab ces kev tso cia cov roler nyob hauv qhov ceev tshaj plaws yog tseem ceeb dua los txuag kev ntsuas viscosity rau hauv 1,500 cP. Lub tshuab tseem ceeb tshaj plaws uas cov neeg siv khoom tseem ceeb siv yog infrared thermal maps los nrhiav cov teeb meem ntawm kev sov qhov xub thiab qhov xub ntawm cov khoom uas ua rau cov khoom tsis sov raws li xav. Cov phab ntsa uas cov neeg siv khoom tuaj yeem txuag cov kev tswj hwm raws li xav tau yuav muaj kev tawg tshaj plaws tsis raug xav tau nyob hauv 30%, uas yuav muab cia kev ntshai ntau dua thaum lub sijhawm. Thiab cov neeg siv khoom kuj pom tias cov khoom tau muab txuag raws li xav tau thaum lub ntiaj teb thib peb, uas yog tias muaj kev ua dua ntau dua thiab cov neeg siv khoom yuav nyiam dua.

Cov Lus Nug Nrov (FAQ)

VAE emulsion yog dab tsi thiab nws sib txawv li cas ntawm cov adhesive lwm yam?

VAE emulsion yog qhov adhesive uas ua los ntawm vinyl acetate thiab ethylene. Nws sib txawv ntawm lwm yam adhesive zoo li PVA thiab acrylics los ntawm qhov nws tuaj yeem ua kev nyhav zoo rau hauv qhov ntsuas uas muaj qhov ntsuas thiab qhov ntsuas tsis ntsuas los ntawm qhov molecular structure uas nws muaj.

Yog VAE emulsions tuaj yeem siv rau cov khoom siv uas tsum muaj kev txawj xyuam los ntawm qhov chaw sib sau?

Yes, VAE emulsions yog txhua yam tuaj yeem siv dua thiab muaj kev nyuaj rau dej, ua rau nws zoo rau kev sib sau uas muaj kev nyuaj rau lub vaj huam sib thooj thiab sib sau rau kev nyuaj rau lub vaj huam sib thooj.

Cov lus uas tseem ceeb rau kev txhim kho VAE emulsion rau kev sib sau hauv tsev tsim khoom yog dab tsi?

Cov lus tseem ceeb ntawm kev ua haujlwm yog lub sijhawm uas tuaj yeem siv, kev nyuaj rau kev sib sau, thiab kev kho qhov cua rau lub rola, uas pab tshem tso kev sib sau zoo thiab tshem tso cov kev puas tsuaj thaum sib sau.

Qhov kev sib piv ntawm vinyl acetate thiab ethylene yog dab tsi tseem ceeb rau VAE formulations?

Qhov kev sib piv no pab cuam tshuam rau kev nyuaj rau dej thiab kev siv dua, thiab cov kev sib piv nyob rau hauv qhov sib txawv pab muab cov kev nyuaj rau dej thiab kev siv dua, uas pab cov neeg tsim khoom txhim kho cov khoom rau kev siv nyob rau hauv qhov sib txawv.