VAE Emulsion ua ke tshuab sau nrog rau ntawv saum npoo: Pab txo qhov chaw smoothness

Yog li cas VAE Emulsion Pab Txo Qhov Smoothness ntawm Lub Saub Hniav

Qhov Kev Form Film thiab Qhov Chaw Siv Hauv Lub Teb Chaws

Lub VAE emulsion ua haujlwm zoo rau kev pab txo qhov saub hniav kom ncav ncav dua los ntawm qhov chaw nws tsim film. Thaum daim ntawv poob, cov polymer leeg leeg no tseem tuaj yeem muaj feem rau kev tsim ib qho zoo li ib lub film sib txuas thiab yooj yim hloov pauv nyob rau sab nraud ntawm lub saub hniav. Qhov no tshwm sim tshwj tsis yog los ntawm kev nqus dej thaum dej tau mus, tom qab ntawd cov polymer chains thiaj mus cuam tshwv rau kev sib xyaw. Qhov uas tsim nyog rau VAE thaum kawg ntawm lwm hom phuaj ntxoog tsis yooj yim yog tias nws muaj qhov xwm txheej thermoplastic uas pab nws rhuav tshem zoo dua rau hauv cov saub. Cov kev soj ntsuam sau tias qhov no tuaj yeem txo qhov roughness sab nraud los ntawm li 35%, raws li kev ntsuam ISO 8791-4. Tus nqi yog ib qhov chaw flat uas pab tiv thaiv ink tsis pub ntau heev thaum sau, txhua yam tsis muaj kev puas tsuaj rau qhov chaw nrog lossis qhov kev sib tw ntawm lub saub hniav.

Txoj hneev ntawm lub pob thiab tus leej ntawm Kev Loj (Tg) nyob rau hauv kev tsim kho kom ncav ncav

Kev smooth ntawm cov chaw nruj tshaj plaws yog nyob ntawm ob qho kev sib txawv ntawm cov dundob uas tau siv hauv kev tsim: lub hais tias cov dundob meej li cas thiab dab tsi yog taimperatura uas lawv hloov los ntawm ib qhov chaw mus rau qhov chaw nyuaj (hu ua Tg). thaum peb mus txog cov dundob me me ntawm 80 mus 150 nanometers, cov dundob me no tau zwm deb hauv qab ntawm qhov chaw sib sau, tso cai rau cov khaub ncaws me me uas ua rau cov chaw nruj tshaj plaws feel rough hauv qab saib xam. Lub taimperatura transition ntawm glass yuav tsum tau kho kom raug. Cov dundob uas muaj Tg tsawg dua yuav nyuaj dua thaum lawv poob, muab cov chaw nruj tshaj plaws zoo dua. Tab sis thaum peb mus txog Tg, tus lej ntawm cov khoom yuav nce mus rau siab dua, ua rau nws yooj yim dua los tso tseg nyob hauv qhov chaw ruaj khov lossis thaum nws tuaj yeem tshaj tawm hauv calendering kev lag luam. Yog tias peb tau txais ob qho no kom raug, ces peb yuav tau txais cov lus nug ntawm Bekk smoothness tshaj 300 seconds tshaj tawm. Qhov no yog zoo dua tshaj qhov standard binders tuaj yeem pom hauv cov chaw nruj tshaj plaws tshaj tawm tshiab.

VAE Emulsion vs. Lwm Qhauv Cob: Sib Piv Kev Tshwm Kab Ua Ib Hom

Sib Piv Nrog Starch thiab Styrene-Butadiene Latex siv ISO thiab Bekk Smoothness Metrics

Kev them sau tshuaj pom tias thaum peb saib ntau yam lus qhia los ntawm kev them cov duab ntawm ISO 8791-4 thiab standart Bekk txog kev smoothness, VAE emulsions zoo dua starch thiab styrene-butadiene (SB) latex. Starch binders muaj qee yam txwv. Vim tias lawv cov molecul rhaub thiab muaj feem ntau ua rau muaj ntau lub ntim leeg, lawv feem ntau muaj cov luv uas nyob hauv 100 seconds thiab feem ntau tshwm sim cov films uas tsis sib xws hauv pem teb. Thaum SB latex pab zoo dua nyob rau kev tiv thaiv nrog dej, nws feem ntau tas thaum nws haus khi tes, uas tsis zoo rau kev smoothness. Vim li no VAE zoo dua. Qhov sib piv zoo tshwj xeej ntawm viscosity thiab elasticity, thiab ib qhov glass transition temperature tsis ntev, txav mus rau cov films uas tsim tshiab tsis muaj cuab yeej. Cov films no tseem tuaj yeem sau khoom rau hauv qhov chaw me me hauv substrates zoo. Kev them sau tshuaj nyob rau hauv keev cuab yeej los ntawm cov neeg tshuaj xyuas tsoom pom tau qhov no. VAE coatings feem ntau muaj cov luv Bekk nyob hauv 200 thiab 320 seconds, uas yog 30 thiab 50% zoo dua starch. Tom qab ntawd, cov coatings no tso cai rau gloss zoo ib yam thiab tsis muaj qhov chaw tsis zoo. Rau cov neeg xauv uas ua haujlwm ntau rau kev xauv zoo, qhov no txhais tau tias tsawg ink bleeding thiab kev ua haujlwm zoo dua.

Kwv yuav siv VAE Emulsion los tso koob kom zoo tshaj

Txoj ceeb ncaj ntawm Calcium Carbonate thiab Rheology Modifiers

VAE emulsions ua haujlwm zoo tshaj rau calcium carbonate (CaCO3) thiab qhov no pab tsim cov saum npoo nyeej siab dua vim tias cov filler thiab polymer muaj kev sib raug zoo ib together. Qhov tension ntawm saum npoo ntawm qhov qab zib yog li cas lub calcium carbonate particles (me dua 2 microns) faus tas li rau hauv cov mixture. Qhov distribution sib xws no txo cov ntxiv leeg zoo li cov ntxiv leeg thiab tiv thaiv cov ntxiv leeg ntawm saum npoo los tsim. Thaum peb sib sau VAE nrog ib qho lo lus tshuaj thickener uas hu ua associative thickeners, muaj ib yam tiag tiag tshwm sim. Qhov sib txuam tag nrho muaj kev flow zoo tom qhov twg yuav muaj stress. Yog li thaum sau, tsis tas yuav muaj kev tuag lossis sagging, tab sis tom qab sau, vajvoob yuav leveling tau zoo. Yuav ua li cas ntxiv li? VAE muaj cov particles uas nyob ze ntawm 0.5 mus 2 microns uas nyob hauv qhov chaw uas tseem pom hauv pigment particles thiab saum npoo ntawm daim ntawv.

Kev Ruaj Khov Lub Zog, Ntau Ntau, thiab Qaub—Kev Sib Tshuam ntawm Kev Raug

VAE emulsions ua haujlwm zoo tshaj plaws nrog siv ntau qhiv muaj zog, feem ntau nyob rau sab 55 mus 65% ntawm qhov muaj zog. Qhov no pab rau tus kws tsim khoom siv cov kab uas muaj qhov nyiav nyiav ntawm 8 mus 12 grams ib met thiab muaj qhov saum npoo smooth. Tom qab no, qhov kev siv no cuam tshuam rau huab cua sov los ntawm li 18% kompared rau cov rooj kawg nkawv ntxiv lawm. Tab sis muaj ib qho yuav tsum xav kom meej no: thaum qhov muaj zog loj dua, nws feem ntau tsim qhov saum npoo siab dua li xav tau, uas tuaj yeem cuam tshuam txog qhov zoo ntawm qhov feel ntawm lub surface, yog tias siv rau cov khoom siv zoo tshaj plaws. Qhov chaw zoo tshaj plaws seem to be nyob rau hauv 8-12 g/m². Nyob rau hauv qhov no, daim test Bekk smoothness muaj qhov ntau dua li 300 seconds, thiab qhov gloss nyob rau hauv qhov tseem ceeb rau ntau yam kev siv khoom siv, muaj sheen tsawg dua li 65 GU nyob rau 75 degrees. Rau cov kev siv khoom xav tau properties zoo dua, VAE grades uas muaj Tg tsuag dua, nyob rau sab minus 5 degrees Celsius mus rau 10 degrees Celsius, ua haujlwm zoo heev. Tab sis cov no yuav tsum xav tau cov additives tshiab uas hu ua rheology modifiers kom tsoom tawm qhov sink ntau rau hauv cov khoom siv porous tshaj plaws.

Ntaub ntawv qhia kev siv rau kev sau xov tooj thiab kev ntxuav

Yog xav tau qhov chaw smooth surface finish thaum siv VAE emulsion binders, ces yuav tsum tshawb nrhiav ntau yam cuab meej tseemceeb uas tuaj zoo hauv kev tsim kho. Thaum ua ntej ntawm txhua yam, lub coating yuav tsum muaj viscosity nyob rau 800 rau 1200 mPa.s. Siv cov associative thickeners tuaj yeem pab ntau vim lawv tso kom tsis muaj cov streaks, tshpecially thaum running at line speeds nyob rau 600 thiab 1000 meters per minute. Txog kev drying, muaj leej twg tseem ceeb uas ntau chaw nyob rau staged drying processes. Pib nrog temperatures nyob rau 90 thiab 110 degrees Celsius hauv thawj drying zones kom tso kom tsis muaj cov pesky blisters. Tom qab ntawd ntxuav dav dua rau qib kawg mus rau 110-130 degrees kom film tuaj yeem tsim tau raws li xws. Lub concentration of VAE emulsion solids kuj tseem tseem ceeb. Xav kom muaj li 12 rau 18 percent ntawm tag nrho pigment weight kom tau qhov sib npaug distribution ntawm chaw. Thiab tsis txhob saib xyuas kev tswj humidity hauv rewinding operations. Tswj kev noj qab joo siab saum 60% relative humidity tuaj yeem pab kom tsis muaj blocking issues tom qab.

Yog kom tuaj saib qhov tseem ceeb, peb xav xav kom muab kev ntsuas qhov zoo ntawm Bekk nyob rau sab nraud hli ntawm ib chaw. Yog tias muaj qhov ntsuas tau li 300 feeb lossis ntau dua, ces peb yuav pom tias yog chawks tshaj tseem ceeb. Tab sis yog hais tias qhov ntsuas tsawg dua 200 feeb, ces yuav tsum muaj kev hloov pauv. Yuav tsum hloov qhov siab ntawm calendering los ntawm 100 mus 200 kN/m lossis ntxiv VAE ntau npaum li 2 mus 3 percent. Cov kev hloov me no yuav pab tau ntau rau qhov tseem ceeb ntawm cov khoom tiav. Tsam txhob saib xyuas tias tsis tau ua kev ntsuas sheen uas yog 75 degrees li thaum sawv ntxov, vim tias nws pab paub pom tam sim thaum muaj teeb meem nrog kev sib tshooj ntawm binder. Thiab txhob saib xyuas tias yuav tsum ntsuas viscosity tshiab dhau los ua ntej khiav ib chaw tshiab. Yeej txaus siab tias yuav tsum daws teeb meem rau cov khoom siv dua los ntawm recycled fiber substrates vim tias lawv feem ntau yog ntau av. Rau cov khoom no, yuav tsum sau retention aids tawm ntawm 0.5 mus 1.5 percent ua ntej coating, vim tias nws pab tau rau VAE film formation kom zoo ib yam thiab pab tau rau qhov surface finish kom smooth thiab flat ib yam li yav nyob ib puag ncig xav tau.

FAQ

Koj pom ntau li VAE emulsion?

VAE emulsion yog txoj kev siv polymer nyob rau hauv coatings kom ua rau pem teb smoothness thiab flexibility zoo dua. Nws muaj txoj hnoob tshaj plaws rau hauv kev tsim kho tshuab kom pom zoo dua.

Yog vim li cas qhov chaw ntawm particle size cuam tshuam rau surface smoothness?

Qhov chaw leeg li ntawm particle size tuaj yeem ntxig rau hauv cov chaw me me nyob rau hauv daim duv, ua rau pem teb pom zoo dua. Cov particle uas muaj qhov chaw ntawm 80 thiab 150 nanometers muaj txoj hnoob tshaj plaws.

Qhov tseem ceeb ntawm glass transition temperature (Tg) yog dab tsi?

Glass transition temperature (Tg) yog qhov uas polymer pib los pauv ntawm qhov hard state mus rau qhov pliable state. Qhov Tg tsawg dua tuaj yeem pab rau flexibility zoo dua thiab pem teb pom zoo dua thaum drying.

VAE emulsion sib npaug li cas nrog lwm yam binders?

VAE emulsion ua haujlwm zoo dua lwm yam binder dhau los yog starch thiab styrene-butadiene latex hauv kev pom Bekk smoothness ratings zoo dua, ua rau muaj tsawg dua cov surface defects.

Cov calcium carbonate thiab rheology modifiers muaj txoj hnoob dab tsi?

Calcium carbonate thiab rheology modifiers tso caij rau kev smoothness ntawm coatings los ntawm kev txhim kho qhov flow thiab leveling characteristics ntawm VAE emulsion.