Tshem tso lub zog ntawm Water-Based Ink Stability los ntawm PVA

Yog li cas Polyvinyl Alcohol yog qhov txaus los pab rau kev tswj hwm ntawm colloidal thiab lub neej ntawm khoom

Hydrogen Bonding thiab Steric Hindrance: Ob qhov kev ua haujlwm uas pab tshaum kev sib sau

Ink tias tsis muaj hauv dej tuaj yeem raug txhawb nqa los ntawm polyvinyl alcohol (PVA) nyob rau ob qhov chaw uas sib cuag zoo. Thaum pib, cov nhóm hydroxyl nyob rau hauv PVA sib ntxiv rau cov duab ntawm pigment, tsuas yog tsham ib qho saum npoo tswj plig uas tiv thaiv lawv kom tsis txav mus ze ntxiv. Sim ua los los ntawm American Coatings Association kuj tso caij no, pom tias qhov chaw nqaj teev tau txo txog 80% dhau li systems tseem ceeb uas tsis muaj kev txhawb nqa. Qhov uas txwv tsis pub PVA tawm ntawm lwm yam txhawb nqa yog tias nws tso caij hauv pH levels thay, uas yog ib qhov tseem ceeb heev rau ink tseem ceeb nyob rau hauv qhov chaw sib txawv. Cov neeg tsim ink pom tias qhov no yog ib qhov tseem ceeb vim tias cov pigment nyob deb deb dua li ib xyoo, txo qhov tshwm sim tshwm sim thaum yam tseem ceeb nyob rau hauv qhov chaw nqaj.

PVA vs. Acrylic Emulsions: Kawm Txoj Cai ntawm Viscosity, Kawm Txoj Cai ntawm Film, thiab Kawm Txoj Cai ntawm Dispersion

Thaum chav sib ntxiv acrylic muaj kev nyob siab thaum pib, PVA muaj kev nyob siab tshaj plaws hauv qhov chaw kawm ntawm tus ink:

PVA muaj nuj njiab kawg siab (13–22 kDa) txhim kho qhov ceev ntawm qhov tsha nyob rau sab nraud tsis txhob hlav kev tiv thaiv. Tom qab no, acrylics feem ntau xav tau cov plasticizers uas yuav tshwm sim thaum sijhawm, ua rau ink film puag. Qhov PVA covalent bonding nrog cellulose fibers tseem pab txhim kho kev nyob dav ntawm kev sau saib rau hauv kev siv packaging—reducing rub-off by 40% hauv accelerated aging trials.

Sib piv PVA Molecular Weight thiab Hydrolysis Degree rau kev txhim kho zog

Hydrolysis Degree (87–99%) Yuav Tsim Kev Ntshiab Ntawm pH, Kev Tiv Thaiv Ntawm Ntaub Nkhaus, Thiab Kev Sib Pab Nrog Binders

Qhov hydrolysis degree ntawm polyvinyl alcohol (PVA) tsim kev nyob ruaj khov ntawm ink los ntawm peb hom kev tsim nyog:

• kev Ntshiab Ntawm pH : PVA uas hydrolyzed tag nrho (>98%) thiaj li nyob ruaj khov hauv qhov alkaline conditions tab sis yuav precipitates nyob rau saum npoo pH 5. Cov PVA uas tsis hydrolyzed tag nrho (87–92%) tuaj yeem tiv thaiv hauv qhov pH kawg (3–10), pab ntxiv rau kev sib pab nrog acidic binders.
• Dej tsis kam : Qhov hydrolysis sib cau (≥95%) cuam tshuab qhov solubility ntawm dej ntuj siab, txhim kho qhov sib tshooj dej hauv cov inks siv los nres khoom. Nyob rau 88% hydrolysis, PVA rov qab sau ua dej nyob rau 25°C tab sis tsim cov films uas tsis rov qab sau ua dej thaum tshaj 50°C—raug rau cov cartons uas tuaj yeem sau ua kom ncav cuag los ntawm kuab.
• Kev sib raug zoo ntawm cov chaw sau : Qhov hydrolysis kheej kheej (90–94%) txhim kho kev sib thooj ntawm hydrogen nrog acrylic emulsions, tiv thaiv kev sib lah thiab pab kev sib txawv ntawm cov pigment thiab kev nyiam viscosity hauv qab kev ceev.

PVA muaj saum luv luv (13–22 kDa): Txhim kho kev sov ntxoov ntxoo thiab tswj qhov gloss thiab kev tiv thaiv

PVA muaj saum luv luv (13–22 kDa) txhim kho kev ua haujlwm ntawm cov inks siv dej los ntawm:

• Sov ntxoov ntxoo dua : Qhov dav ntawm polymer luv dua cuam tshuab qhov viscosity ntawm solution los ntawm 30–40% tshaj PVA muaj saum loj, txhim kho kev sov ntawm solvent thiab kho kev sov los ntawm 25% tsis tas sau ua kuab.
• Tswj qhov gloss ntawm saum : Cov saum luv luv tsim cov films ntau dua hauv qab kev rov qab sau, txhim kho kev rov qab sau ntawm daim liab rau 85+ GU gloss ratings—tham xam cov inks siv solvent.
• Kev nyiam meej ruaj pVA 18–22 kDa uas tau qhia kom zoo tshaj plaws ua rau qhov ntsuas ntawm kev txuas ntaus tsis hloov los ntawm kev suav ntev ntev, thiab tau txais >50 zaug ntawm Sutherland rub testers—sib tham rau kev tsim khoom ntev thiab kev nyab xeeb rau qhov siv tom ntej.

^{*Qhov luj li cas yog qhov tshuaj xyuas hauv tsev tshuaj xyuas ntawm PVA ntawm kev npaj tshuaj xyuas (2024).}

Tshawb nrhiav cov teeb meem ntawm kev tsis zoo ntawm kev siv khoom nrog kev xaiv Polyvinyl Alcohol uas muaj kev tswj hwm.

Dab neeg tshawb: Cov neeg npaj tshuaj xyuas rau cov kab mob tshuaj xyuas tau txais kev ceev ntau dua 92% ntawm kev ntxov tshuaj xyuas rau cov kab mob tshuaj xyuas nrog kev siv Partially Hydrolyzed Polyvinyl Alcohol

Lub npe loj ntawm kev kho cov lus qhia ntawm cov lus qhia nyob rau hauv cov lus qhia yog tsis muaj kev pheej yig thiab cov lus qhia yog tsis muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej yig rau hauv cov lus qhia uas muaj kev pheej y......

PVA uas tau hydrolyzed ib puag ncig ntawm pigment surfaces, tsim ib qhov physical barrier uas txo gravitational settling. Qhov no tshwm sim kom tsis tas yuav siv anti-sedimentation additives—txo nqi los li 15% thiab pab txhim kho ink recyclability. Tom qab tshawb xyuas rov qab, pom tias muaj kev txo hnav los li 92% tom qab 30 hnub tso sai. Kev lag luam ntawm kev sau phaj kuj zoo dua:

• Rub resistance nyiag dua li 40%
• Dot gain uniformity cuab tam sim li mus rau 98% consistency
• Viscosity drift nyob saum npoo ±5% hauv 8-hour runs

Qhov formulation uas tau txhim kho tso tseg shelf life mus rau 9 months tsis tas ceev siab—a lub tuaj mob tseem ceeb rau just-in-time production environments uas storage stability tsis yog xav tau muaj feem rau kev ua haujlwm zoo.

Cov kev ua tib neeg zoo tshaj rau kev suab nrog Polyvinyl Alcohol rau hauv High-Performance Water-Based Ink Systems

Yog xav tau polyvinyl alcohol sib txig zoo nrog siv nyiaj hauv dej, ces yuav tsum muab caij nram qhov kev ua thiab tswj xyuas cov cuab yeej. Pib los los nrog kev muab PVA mus rau hauv thiab muab pigment faib tso rau hauv kom tsis txawv muaj av muaj kab npe tawm. Tswj xyuas kom cov ntsuab ntshiab nyob ntuj 40 mus 50 degrees Celsius yuav pab tshem cov khoom noj mus ntau dua, tab sis tswj xyuas kom meej kom tsis txav ruaj ntau vim tias yuav tshwm sim kev puav tseg cov leej pneev. Rau kev sib txig, ntau tus neeg thaj yeej ua tau zoo nrog kev siv cov cuab yeej ntxig siab uas muaj 800 mus 1200 revolutions per minute ib pliag li cas li. Qhov tseem ceeb tshaj plaws yog kom tag nrho cov khoom no tau sib txig zoo. Thaum kawg qhov kev ua no, yuav tsum roj tshuaj saum npoo kom meej meej. Peb xav tau ib qhov sib xws nyob rau hauv 5 percent kom paub tseeb tias yuav tau ib qhov kev siv zoo thaum siv cov khoom tiav.

Tom qhia rov sau ua ke, txhim kho lub pH tshaj tshuav ntawm 8 thiab 9 los ntxiv ammonia lossis amines kom tau kev sib xyuas hydrogen zoo tshaj rau cov pigment hauv daim duab tsim. Yuav tsum tau nrhiav kom pom tus kawm hydrolysis ua ntej vim tias nws nyob ntawm yam khoom sib kis nrog cov chaw nyob sab nraud sib txawv. Thaum siv nrog cov ntim raj uas tsis muaj av suab, thiaj li mus rau 87 mus 89 feem pua kawg hydrolysis kom tswj siab kev ua tau. Sib xyeej nrog PVA uas muaj qhov hnyav molecular tsuas yog 13 mus 18 kilodaltons yog tias lub sijhawm xaub ntau yuav tsum tau ntev rau kev tsim khoom. Kom pom yog tias ink tsis hlo li cas thaum ntev, sim ntau zaus ntawm lub sijhawm nyob ntawm kab ntse thiab peb tuaj yeem ntuav settling rates ntawm 45 degrees Celsius rau 48 teev ib ncig ua leej twg sawv cev rau kev phom pob lossis zoo. A muaj kev kuaj xyuas kev lag luag ntau yam rau manufacturing txhua yam viscosity levels, pH balance, thiab surface tension measurements rau txhua qhov khoom tsim.

Cov Lus Nug Nrov

Yog li cas li polyvinyl alcohol yog tswv yim rau cov ink uas muaj dej?

Polyvinyl alcohol yog tswv yim rau cov ink uas muaj dej vim nws txhawb kom muaj kev nyab xeeb rau cov pigment uas tau muab faib ua ntau qhov thiab nws pab tshem tawm kev muab faib ua ntau qhov thiab kev ntsia, uas pab kom muaj kev nyab xeeb hauv qhov kho thiab kev nyab xeeb ntawm kev faib ua ntau qhov thi.

PVA sib piv rau cov acrylic emulsions li cas?

Thiab li cas li cov acrylic emulsions pab kom muaj kev nyab xeeb thaum kawg, PVA pab kom muaj kev paub txog kev nyias, kev ua film, thiab kev nyab xeeb ntawm kev faib ua ntau qhov thi rau ntev dua, uas pab kom nws yog qhov zoo dua rau cov ink systems thiaj li muaj kev nyab xeeb hauv txhua qhov ntawm nws lub neej.

Yog li cas li kev hydrolysis degree yog tswv yim rau kev ua haujlwm ntawm PVA?

Kev hydrolysis degree ntawm PVA cuam tshuam rau kev sensitivity ntawm pH, kev resistance rau dej, thiab kev sib sod rau cov binder, uas pab kom muaj kev nyab xeeb thiab kev ua haujlwm zoo dua rau ntau qhov siv hauv cov ink thiab packaging.

Yog li cas li PVA tuaj yeem pab kom ink sau ntev dua?

PVA ntawm qhov ntau hauv qhov ntau yuav ua rau qhov ntau ntawm cov lus qhia yuav nyoo, thiab ua rau cov lus qhia yuav tawg los ntawm qhov ntau, uas ua rau qhov ntau yuav sov dua tsis muaj kev txhawb nqa rau qhov ntau thiab kev tswj hwm rau qhov ntau.