Cov tshuaj ua kom tuab rau cov xim pleev xim latex yuav tsum muaj kev sib raug zoo nrog cov tshuaj latex polymer, txwv tsis pub yuav muaj me ntsis ntawm cov qauv hauv zaj duab xis txheej, thiab cov khoom me me uas tsis tuaj yeem rov qab sib sau ua ke yuav tshwm sim, ua rau qhov viscosity txo qis thiab qhov loj ntawm cov khoom me me. Cov tshuaj ua kom tuab yuav hloov qhov them ntawm cov emulsion. Piv txwv li, cov tshuaj cationic thickeners yuav muaj cov nyhuv tsis tuaj yeem rov qab rau cov anionic emulsifiers thiab ua rau demulsification. Cov tshuaj pleev xim latex zoo tagnrho yuav tsum muaj cov yam ntxwv hauv qab no:
1. Cov tshuaj tsawg thiab viscosity zoo
2. Kev ruaj khov zoo, yuav tsis txo qhov viscosity vim yog qhov kev ua ntawm cov enzymes, thiab yuav tsis txo qhov viscosity vim yog kev hloov pauv ntawm qhov kub thiab pH tus nqi
3. Kev khaws dej zoo, tsis muaj cua npuas pom tseeb
4. Tsis muaj kev phiv rau cov yam ntxwv ntawm cov xim pleev xim xws li kev tiv thaiv txhuam, kev ci ntsa iab, lub zog zais thiab kev tiv thaiv dej
5. Tsis muaj flocculation ntawm pigments
Cov txheej txheem ua kom tuab ntawm cov xim latex yog ib qho tseem ceeb los txhim kho qhov zoo ntawm cov xim latex thiab txo cov nqi. Hydroxyethyl cellulose yog ib qho khoom ua kom tuab zoo tagnrho, uas muaj ntau yam teebmeem ntawm kev ua kom tuab, kev ruaj khov thiab kev hloov kho rheological ntawm cov xim latex.
Hauv cov txheej txheem tsim cov xim latex, hydroxyethyl cellulose (HEC) yog siv los ua tus neeg faib tawm, thickener thiab pigment suspending agent los tswj cov viscosity ntawm cov khoom, txo cov agglomeration, ua rau cov xim zaj duab xis du thiab du, thiab ua rau cov xim latex ruaj khov dua. Zoo rheology, tuaj yeem tiv taus lub zog siab shear, thiab tuaj yeem muab kev sib npaug zoo, tiv taus khawb thiab pigment uniformity. Tib lub sijhawm, HEC muaj kev ua haujlwm zoo heev, thiab cov xim latex thickened nrog HEC muaj pseudoplasticity, yog li txhuam, dov, sau, txau thiab lwm txoj hauv kev tsim kho muaj qhov zoo ntawm kev txuag zog, tsis yooj yim rau kev tshem tawm, sag, thiab tsawg dua splashing. HEC muaj kev txhim kho xim zoo heev. Nws muaj kev sib xyaw zoo heev rau feem ntau cov xim thiab cov binders, uas ua rau cov xim latex muaj xim zoo sib xws thiab ruaj khov. Versatility rau daim ntawv thov hauv cov qauv, nws yog non-ionic ether. Yog li ntawd, nws tuaj yeem siv rau hauv ntau pH (2 ~ 12), thiab tuaj yeem sib xyaw nrog cov khoom hauv cov xim latex dav dav xws li cov xim reactive, cov khoom ntxiv, cov ntsev soluble lossis electrolytes.
Tsis muaj kev cuam tshuam tsis zoo rau cov zaj duab xis txheej, vim tias HEC cov kua dej muaj cov yam ntxwv ntawm qhov dej ntws, nws tsis yooj yim rau ua npuas ncauj thaum lub sijhawm tsim khoom thiab kev tsim kho, thiab qhov nyiam ntawm cov qhov hluav taws kub thiab cov qhov pinholes tsawg dua.
Kev ruaj khov zoo thaum khaws cia. Thaum khaws cia ntev, cov xim yuav yaj thiab tsis lo rau, thiab tsis muaj teeb meem xim ntab thiab tawg paj. Muaj txheej dej me me rau ntawm qhov chaw ntawm cov xim, thiab thaum qhov kub khaws cia hloov pauv ntau heev. Nws qhov viscosity tseem ruaj khov.
HEC tuaj yeem ua rau kom cov khoom sib xyaw PVC (cov xim ntim concentration) nce mus txog 50-60%. Tsis tas li ntawd, cov xim pleev xim uas ua rau cov xim pleev xim dej kuj siv tau HEC.
Tam sim no, cov thickeners siv rau hauv cov xim pleev xim nruab nrab thiab qib siab yog cov khoom xa tuaj HEC thiab acrylic polymer (xws li polyacrylate, homopolymer lossis copolymer emulsion thickeners ntawm acrylic acid thiab methacrylic acid) thickeners.
Hydroxyethyl cellulose tuaj yeem siv rau kev ua cov khoom noj khoom haus
1. Ua ib qho tshuaj dispersant lossis cov kua nplaum tiv thaiv
Feem ntau, HEC nrog viscosity ntawm 10-30mPaS yog siv. HEC uas siv tau txog li 300mPa·S yuav muaj qhov cuam tshuam zoo dua yog tias nws siv ua ke nrog anionic lossis cationic surfactants. Qhov kev siv tshuaj feem ntau yog 0.05% ntawm monomer pawg.
2. Ua ib qho thickener
Siv 15000mPa. Qhov kev siv tshuaj ntawm HEC siab viscosity saum toj no s yog 0.5-1% ntawm tag nrho cov hnyav ntawm cov xim latex, thiab tus nqi PVC tuaj yeem ncav cuag li 60%. Siv HEC ntawm li 20Pa, s hauv cov xim latex, thiab kev ua tau zoo ntawm cov xim latex yog qhov zoo tshaj plaws. Tus nqi ntawm kev siv HEC saum toj no 30O00Pa.s qis dua. Txawm li cas los xij, cov khoom sib npaug ntawm cov xim latex tsis zoo. Los ntawm qhov kev xav tau zoo thiab kev txo nqi, nws yog qhov zoo dua los siv HEC nruab nrab thiab siab viscosity ua ke.
3. Txoj kev sib tov xim latex
Cov HEC uas kho qhov chaw tuaj yeem ntxiv rau hauv cov hmoov qhuav lossis daim ntawv nplaum. Cov hmoov qhuav raug ntxiv ncaj qha rau hauv cov xim sib tsoo. Lub pH ntawm qhov chaw pub yuav tsum yog 7 lossis qis dua. Cov khoom Alkaline xws li Yanbian dispersant tuaj yeem ntxiv tom qab HEC ntub thiab tawg tag nrho. Cov slurries ua nrog HEC yuav tsum tau sib xyaw rau hauv cov slurry ua ntej HEC muaj sijhawm txaus los hydrate thiab cia kom tuab mus rau qhov tsis siv tau. Nws tseem ua tau los npaj HEC pulp nrog ethylene glycol coalescing agents.
4. Tiv thaiv pwm ntawm cov xim latex
HEC uas yaj tau hauv dej yuav lwj thaum sib cuag nrog cov pwm uas muaj cov teebmeem tshwj xeeb rau cellulose thiab nws cov derivatives. Nws tsis txaus kom ntxiv cov tshuaj preservatives rau cov xim ib leeg xwb, txhua yam khoom yuav tsum tsis muaj enzyme. Lub tsheb tsim cov xim latex yuav tsum khaws cia kom huv, thiab txhua yam khoom siv yuav tsum tau sterilized tas li nrog cov pa 0.5% formalin lossis O.1% mercury kua.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-26-2022