HEC (hydroxyethyl cellulose) yog ib qho cellulose ether uas tsis yog ionic siv dav hauv kev lag luam coatings. Nws cov haujlwm suav nrog thickening, dispersing, suspensioning thiab stabilizing, uas tuaj yeem txhim kho kev ua haujlwm ntawm kev tsim kho thiab cov nyhuv ntawm zaj duab xis ntawm cov coatings. HEC yog siv dav hauv cov coatings dej vim nws muaj cov dej zoo solubility thiab tshuaj stability.
1. Txoj kev ua haujlwm ntawm HEC
Cov nyhuv tuab
Ib qho ntawm cov haujlwm tseem ceeb ntawm HEC hauv cov txheej txheej yog ua kom tuab. Los ntawm kev nce qhov viscosity ntawm lub kaw lus txheej, cov txheej txheej thiab cov khoom sib npaug tuaj yeem txhim kho, qhov tshwm sim sagging tuaj yeem txo qis, thiab cov txheej txheej tuaj yeem tsim cov txheej txheej sib xws ntawm phab ntsa lossis lwm qhov chaw. Tsis tas li ntawd, HEC muaj peev xwm ua kom tuab, yog li nws tuaj yeem ua tiav qhov zoo tagnrho txawm tias muaj me ntsis ntxiv, thiab muaj kev lag luam zoo.
Kev ncua thiab kev ruaj khov
Hauv lub txheej txheej, cov khoom khov kho xws li cov xim thiab cov khoom sau yuav tsum tau sib npaug zos hauv cov khoom siv, txwv tsis pub nws yuav cuam tshuam rau qhov tsos thiab kev ua tau zoo ntawm cov txheej txheej. HEC tuaj yeem ua kom zoo tswj tau qhov sib faib ntawm cov khoom khov kho, tiv thaiv kom tsis txhob muaj nag, thiab ua kom cov txheej txheej ruaj khov thaum lub sijhawm khaws cia. Qhov kev ncua no tso cai rau cov txheej txheej rov qab mus rau qhov xwm txheej sib xws tom qab khaws cia ntev, txo cov stratification thiab nag.
Kev khaws dej
HEC tuaj yeem pab cov dej hauv cov xim kom maj mam tso tawm thaum lub sijhawm pleev xim, yog li ntawd ntev lub sijhawm ziab ntawm cov xim thiab ua rau nws tiaj tiaj thiab ua zaj duab xis rau ntawm phab ntsa. Qhov kev ua tau zoo ntawm cov dej no tseem ceeb heev rau cov txiaj ntsig ntawm kev tsim kho, tshwj xeeb tshaj yog nyob rau hauv qhov chaw kub lossis qhuav ntawm kev tsim kho, HEC tuaj yeem txo qhov teeb meem ntawm kev tsim zaj duab xis tsis zoo uas tshwm sim los ntawm kev ua dej sai dhau.
Kev tswj hwm rheological
Cov khoom rheological ntawm cov xim pleev xim ncaj qha cuam tshuam rau qhov kev xav thiab zaj duab xis zoo ntawm kev tsim kho. Cov tshuaj uas tsim los ntawm HEC tom qab yaj hauv dej muaj pseudoplasticity, uas yog, qhov viscosity txo qis hauv qab lub zog siab shear (xws li txhuam thiab dov), uas yooj yim txhuam; tab sis qhov viscosity rov qab los hauv qab lub zog qis shear, uas tuaj yeem txo qhov sagging. Qhov no tsis yog tsuas yog pab txhawb kev tsim kho, tab sis kuj ua kom muaj kev sib xws thiab tuab ntawm cov txheej.
2. Cov txiaj ntsig ntawm HEC
Kev yaj dej zoo
HEC yog ib yam khoom polymer uas yaj tau hauv dej. Cov tshuaj uas tsim tom qab yaj yog pob tshab thiab pom tseeb, thiab tsis muaj kev cuam tshuam tsis zoo rau lub tshuab pleev xim uas siv dej. Nws qhov kev yaj kuj txiav txim siab nws qhov yooj yim siv hauv lub tshuab pleev xim, thiab nws tuaj yeem yaj sai yam tsis tsim cov khoom me me lossis cov khoom sib xyaw.
Kev ruaj khov tshuaj lom neeg
Ua ib qho cellulose ether uas tsis yog ionic, HEC muaj kev ruaj khov tshuaj zoo thiab tsis yooj yim cuam tshuam los ntawm cov yam xws li pH, kub, thiab cov hlau ions. Nws tuaj yeem ruaj khov hauv cov kua qaub thiab alkaline muaj zog, yog li nws tuaj yeem hloov kho rau ntau hom txheej txheem.
Kev tiv thaiv ib puag ncig
Nrog kev txhim kho ntawm kev paub txog ib puag ncig, cov txheej txheem VOC qis (volatile organic compound) tau dhau los ua nrov dua. HEC tsis muaj tshuaj lom, tsis muaj teeb meem, tsis muaj cov kuab tshuaj organic, thiab ua tau raws li cov kev cai tiv thaiv ib puag ncig, yog li nws muaj ntau yam kev cia siab rau daim ntawv thov hauv cov txheej txheem dej-raws li tus phooj ywg ib puag ncig.
3. Cov nyhuv ntawm HEC hauv kev siv ua haujlwm
Cov txheej txheem phab ntsa sab hauv
Hauv cov txheej txheem phab ntsa sab hauv, HEC ua tus thickener thiab rheology modifier tuaj yeem txhim kho kev ua tau zoo ntawm cov txheej txheem, muab nws zoo leveling thiab adhesion. Tsis tas li ntawd, vim nws cov dej zoo heev, HEC tuaj yeem tiv thaiv cov kab nrib pleb lossis hmoov ntawm cov txheej txheem phab ntsa sab hauv thaum lub sijhawm ziab.
Cov txheej txheem phab ntsa sab nraud
Cov txheej txheem phab ntsa sab nraud yuav tsum muaj kev tiv thaiv huab cua zoo heev thiab tiv thaiv dej. HEC tsis yog tsuas yog txhim kho qhov kev khaws cia dej thiab rheology ntawm cov txheej txheem, tab sis kuj txhim kho cov khoom tiv thaiv kev sagging ntawm cov txheej txheem, yog li ntawd cov txheej txheem tuaj yeem tiv taus cua thiab nag tom qab kev tsim kho thiab txuas ntxiv nws lub neej kev pabcuam.
Xim pleev xim latex
Hauv cov xim latex, HEC tsis yog tsuas yog ua haujlwm ua cov khoom tuab xwb, tab sis kuj txhim kho qhov zoo ntawm cov xim thiab ua rau cov zaj duab xis du. Tib lub sijhawm, HEC tuaj yeem tiv thaiv cov xim los nag, txhim kho kev ruaj khov ntawm cov xim, thiab ua rau cov xim latex ruaj khov tom qab khaws cia ntev.
IV. Cov kev ceev faj rau kev ntxiv thiab siv HEC
Txoj kev yaj
Feem ntau HEC raug ntxiv rau hauv cov xim ua hmoov. Thaum siv, nws yuav tsum tau maj mam ntxiv rau hauv dej thiab do kom tag nrho kom yaj sib npaug. Yog tias qhov yaj tsis txaus, cov khoom me me yuav tshwm sim, cuam tshuam rau qhov zoo ntawm cov xim.
Kev tswj hwm tshuaj
Tus nqi ntawm HEC yuav tsum tau kho raws li cov mis ntawm cov xim thiab qhov xav tau thickening effect. Tus nqi ntxiv dav dav yog 0.3% -1.0% ntawm tag nrho cov nyiaj. Kev ntxiv ntau dhau yuav ua rau cov xim viscosity siab dhau, cuam tshuam rau kev ua haujlwm ntawm kev tsim kho; kev ntxiv tsis txaus yuav ua rau muaj teeb meem xws li sagging thiab tsis txaus zais zog.
Kev sib raug zoo nrog lwm cov khoom xyaw
Thaum siv HEC, xyuam xim rau qhov sib xws nrog lwm cov khoom xyaw xim, tshwj xeeb tshaj yog cov xim, cov khoom sau, thiab lwm yam. Hauv cov txheej txheem xim sib txawv, hom lossis qhov ntau ntawm HEC yuav tsum tau hloov kho kom tsis txhob muaj kev phiv tshuaj.
HEC ua lub luag haujlwm tseem ceeb hauv kev lag luam txheej, tshwj xeeb tshaj yog hauv cov txheej txheej dej. Nws tuaj yeem txhim kho kev ua haujlwm tau zoo, cov khoom tsim zaj duab xis thiab kev ruaj khov ntawm cov txheej, thiab muaj kev ruaj khov tshuaj zoo thiab kev tiv thaiv ib puag ncig. Ua tus thickener thiab rheology modifier pheej yig, HEC yog siv dav hauv cov txheej txheem phab ntsa sab hauv, txheej txheem phab ntsa sab nraud thiab cov xim latex. Hauv kev siv tiag tiag, los ntawm kev tswj hwm cov tshuaj tsim nyog thiab cov txheej txheem yaj kom raug, HEC tuaj yeem muab cov nyhuv thickening thiab stabilization zoo tshaj plaws rau cov txheej thiab txhim kho kev ua tau zoo ntawm cov txheej.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-01-2024