Hydroxyethyl Cellulose (HEC)yog ib tug thickener, stabilizer thiab rheology regulator feem ntau siv nyob rau hauv latex xim. Nws yog cov dej-soluble polymer compound tau los ntawm hydroxyethylation cov tshuaj tiv thaiv ntawm ntuj cellulose, nrog dej solubility zoo, tsis muaj tshuaj lom thiab tiv thaiv ib puag ncig. Raws li ib qho tseem ceeb ntawm cov xim latex, qhov sib ntxiv ntawm hydroxyethyl cellulose ncaj qha cuam tshuam rau cov khoom siv rheological, txhuam kev ua haujlwm, ruaj khov, gloss, ziab lub sij hawm thiab lwm yam khoom tseem ceeb ntawm cov xim latex.
1. Mechanism ntawm kev txiav txim ntawm hydroxyethyl cellulose
Lub luag haujlwm tseem ceeb ntawm hydroxyethyl cellulose hauv latex xim system muaj xws li:
Thickening thiab stability: Cov pab pawg hydroxyethyl ntawm HEC molecular saw tsim hydrogen bonds nrog dej molecules, uas txhim kho cov dej ntawm lub cev thiab ua rau cov xim latex muaj cov khoom zoo rheological. Nws kuj tseem txhim khu kev ruaj ntseg ntawm cov xim latex thiab tiv thaiv cov sedimentation ntawm pigments thiab fillers los ntawm kev cuam tshuam nrog lwm cov khoom xyaw.
Rheological regulation: HEC tuaj yeem kho cov khoom rheological ntawm cov xim latex thiab txhim kho qhov kev ncua thiab txheej txheej ntawm cov xim. Nyob rau hauv qhov sib txawv shear tej yam kev mob, HEC tuaj yeem qhia qhov sib txawv fluidity, tshwj xeeb tshaj yog nyob rau hauv qis shear tus nqi, nws muaj peev xwm ua kom cov viscosity ntawm cov xim, tiv thaiv los nag, thiab xyuas kom meej lub uniformity ntawm cov xim.
Kev tuav dej thiab dej tuav: Lub hydration ntawm HEC nyob rau hauv cov xim latex tuaj yeem tsis tsuas yog nce nws cov viscosity, tab sis kuj ua rau lub sijhawm ziab ntawm cov xim zaj duab xis, txo qis sagging, thiab xyuas kom meej qhov kev ua tau zoo ntawm cov xim thaum siv.
2. Ntxiv txoj kev ntawm hydroxyethyl cellulose
Txoj kev ntxiv ntawmHECmuaj kev cuam tshuam tseem ceeb ntawm kev ua haujlwm kawg ntawm cov xim latex. Txoj kev sib ntxiv muaj xws li txoj kev sib ntxiv ncaj qha, txoj kev sib cais thiab txoj kev sib cais, thiab txhua txoj kev muaj qhov sib txawv thiab qhov tsis zoo.
2.1 Direct ntxiv txoj kev
Txoj kev sib ntxiv ncaj qha yog ntxiv hydroxyethyl cellulose ncaj qha rau cov xim pleev xim, thiab feem ntau xav tau kom txaus stirring thaum lub sij hawm sib tov. Txoj kev no yog qhov yooj yim thiab yooj yim rau kev khiav lag luam, thiab tsim nyog rau kev tsim cov xim latex. Txawm li cas los xij, thaum ntxiv ncaj qha, vim yog HEC cov khoom loj, nws nyuaj rau yaj thiab tawg sai sai, uas yuav ua rau cov khoom sib xyaw ua ke, cuam tshuam rau cov khoom sib xws thiab rheological ntawm cov xim latex. Txhawm rau kom tsis txhob muaj qhov xwm txheej no, nws yog ib qho tsim nyog los xyuas kom meej lub sijhawm stirring txaus thiab qhov kub thiab qhov tsim nyog thaum lub sij hawm ntxiv txheej txheem los txhawb kev sib cais thiab dispersion ntawm HEC.
2.2 Txoj kev daws teeb meem
Txoj kev sib cais yog kom yaj HEC hauv dej los tsim cov tshuaj muaj zog, thiab tom qab ntawd ntxiv cov tshuaj rau cov xim latex. Txoj kev sib cais tuaj yeem ua kom ntseeg tau tias HEC tau yaj tag nrho, zam qhov teeb meem ntawm cov khoom sib xyaw ua ke, thiab ua kom HEC kom sib npaug sib npaug hauv cov xim latex, ua si lub luag haujlwm kom zoo dua qub thiab hloov kho rheological. Txoj kev no yog tsim rau high-end latex xim cov khoom uas yuav tsum tau ntau dua xim stability thiab rheological zog. Txawm li cas los xij, cov txheej txheem dissolution yuav siv sij hawm ntev thiab muaj kev xav tau siab rau kev sib tw ceev thiab qhov kub thiab txias.
2.3 Txoj kev Dispersion
Txoj kev dispersion sib xyaw HEC nrog lwm cov tshuaj ntxiv lossis cov kuab tshuaj thiab disperses nws siv cov khoom siv siab shear dispersion los ua HEC tusyees faib rau hauv cov xim latex. Txoj kev dispersion tuaj yeem zam qhov sib xyaw ntawm HEC, tswj kev ruaj ntseg ntawm nws cov qauv molecular, thiab ntxiv dag zog rau cov khoom rheological thiab txhuam kev ua haujlwm ntawm cov xim latex. Txoj kev dispersion yog tsim rau cov khoom loj, tab sis nws yuav tsum tau siv cov khoom siv dispersion, thiab kev tswj qhov kub thiab lub sij hawm thaum lub sij hawm dispersion txheej txheem yog nruj heev.
3. Cov nyhuv ntawm Hydroxyethyl Cellulose Addition Method ntawm Latex Paint Performance
Cov txheej txheem sib txawv HEC ntxiv yuav cuam tshuam ncaj qha rau cov khoom tseem ceeb hauv qab no ntawm cov xim latex:
3.1 Rheological zog
Cov khoom rheological ntawmHECyog ib qho qhia txog kev ua tau zoo ntawm cov xim latex. Los ntawm kev kawm ntawm HEC ntxiv txoj kev, nws tau pom tias txoj kev sib cais thiab cov txheej txheem dispersion tuaj yeem txhim kho cov khoom ntawm cov xim latex ntau dua li txoj kev sib ntxiv ncaj qha. Hauv kev ntsuam xyuas rheological, txoj kev sib cais thiab cov txheej txheem dispersion tuaj yeem txhim kho cov viscosity ntawm cov xim latex ntawm qis shear npaum li cas, kom cov xim latex muaj cov txheej txheem zoo thiab raug tshem tawm, thiab zam qhov tshwm sim ntawm sagging thaum lub sij hawm tsim kho.
3.2 Kev ruaj ntseg
HEC ntxiv txoj kev muaj txiaj ntsig zoo rau kev ruaj ntseg ntawm cov xim latex. Cov xim latex siv txoj kev sib cais thiab cov txheej txheem dispersion feem ntau yog qhov ruaj khov thiab tuaj yeem tiv thaiv cov sedimentation ntawm pigments thiab fillers. Txoj kev sib ntxiv ncaj qha yog qhov tsis sib xws HEC dispersion, uas nyob rau hauv lem cuam tshuam rau kev ruaj ntseg ntawm cov xim, thiab nws nquag mus rau sedimentation thiab stratification, txo cov kev pab cuam lub neej ntawm cov xim latex.
3.3 Txheej khoom
Txheej txheej muaj xws li leveling, npog lub zog thiab thickness ntawm txheej. Tom qab siv txoj kev sib cais thiab cov txheej txheem dispersion, qhov kev faib tawm ntawm HEC yog qhov sib txawv dua, uas tuaj yeem tswj tau qhov dej ntawm cov txheej txheem thiab ua rau cov txheej txheem zoo li qib thiab adhesion thaum txheej txheej txheej txheej. Txoj kev sib ntxiv ncaj qha tuaj yeem ua rau tsis sib xws ntawm HEC cov khoom, uas ua rau muaj kev cuam tshuam rau txheej txheej.
3.4 Lub sijhawm ziab
Kev tuav dej ntawm HEC muaj qhov cuam tshuam tseem ceeb rau lub sijhawm ziab ntawm cov xim latex. Txoj kev sib cais thiab cov txheej txheem dispersion tuaj yeem khaws cov dej noo hauv cov xim latex, ua kom lub sij hawm ziab kom ntev, thiab pab txo qhov tshwm sim ntawm kev ziab thiab tawg thaum lub sij hawm txheej txheej. Txoj kev sib ntxiv ncaj qha tuaj yeem ua rau qee qhov HEC tsis ua tiav, yog li cuam tshuam rau kev ziab khaub ncaws thiab txheej txheej zoo ntawm cov xim latex.
4. Cov lus qhia ua kom zoo
Txoj kev sib txawv ntawm kev ntxivhydroxyethyl cellulosemuaj kev cuam tshuam loj rau kev ua haujlwm ntawm cov xim latex. Txoj kev sib cais thiab cov txheej txheem dispersion muaj txiaj ntsig zoo dua li txoj kev sib txuas ncaj qha, tshwj xeeb tshaj yog nyob rau hauv kev txhim kho rheological zog, stability thiab txheej txheej. Txhawm rau txhim kho qhov ua tau zoo ntawm cov xim latex, nws raug nquahu kom siv txoj kev sib cais lossis cov txheej txheem dispersion thaum lub sijhawm tsim cov txheej txheem los xyuas kom meej tag nrho cov kev sib cais thiab cov dispersion ntawm HEC, yog li txhim kho cov kev ua tau zoo ntawm cov xim latex.
Hauv kev tsim khoom tiag tiag, txoj kev tsim nyog HEC ntxiv yuav tsum raug xaiv raws li cov qauv tshwj xeeb thiab lub hom phiaj ntawm cov xim latex, thiab ntawm lub hauv paus no, cov txheej txheem nplawm, dissolving thiab dispersing yuav tsum tau ua kom zoo kom ua tiav qhov zoo tshaj plaws latex xim kev ua tau zoo.
Post lub sij hawm: Nov-28-2024