Hauv kev lag luam pleev xim, qhov ruaj khov thiab rheology ntawm cov xim pleev yog qhov tseem ceeb heev. Txawm li cas los xij, thaum lub sijhawm khaws cia thiab siv, cov xim pleev feem ntau muaj teeb meem xws li tuab thiab sib sau ua ke, uas cuam tshuam rau qhov zoo ntawm kev tsim kho thiab qhov zoo ntawm cov xim pleev.Hydroxyethyl cellulose (HEC), ua ib qho polymer thickener uas yaj tau hauv dej, ua lub luag haujlwm tseem ceeb hauv cov qauv xim. Nws tuaj yeem txhim kho cov khoom rheological ntawm cov xim nplaum, tiv thaiv kev sib sau ua ke, thiab txhim kho kev ruaj khov ntawm kev khaws cia.
1. Vim li cas cov xim pleev xim thiaj tuab thiab sib sau ua ke
Qhov tuab thiab agglomeration ntawm cov xim pleev xim feem ntau muaj feem cuam tshuam nrog cov hauv qab no:
Kev tawg ntawm cov xim tsis ruaj khov: Cov xim me me hauv cov xim pleev xim yuav flocculate thiab settle thaum lub sijhawm khaws cia, ua rau muaj kev sib sau ua ke thiab agglomeration ntau dhau.
Kev ua kom cov dej hauv lub kaw lus: Thaum lub sijhawm khaws cia, kev ua kom cov dej noo ntawm ib feem ntawm cov dej yuav ua rau cov xim nplaum viscosity nce ntxiv, thiab txawm tias tsim cov khoom qhuav rau ntawm qhov chaw.
Kev tsis sib haum xeeb ntawm cov khoom ntxiv: Qee cov khoom ua kom tuab, cov khoom tawg lossis lwm yam khoom ntxiv yuav ua rau muaj kev cuam tshuam, cuam tshuam rau cov khoom rheological ntawm cov xim nplaum, ua rau muaj kev nce ntxiv ntawm viscosity lossis flocculent tsim.
Cov nyhuv ntawm lub zog shear: Kev sib xyaw ua ke lossis kev twj tso kua mis mus sij hawm ntev yuav ua rau cov qauv polymer saw hlau puas tsuaj hauv lub kaw lus, txo qhov fluidity ntawm cov xim nplaum, thiab ua rau nws ntau viscous lossis agglomerated.
2. Lub mechanism ntawm kev ua haujlwm ntawm hydroxyethyl cellulose
Hydroxyethyl cellulose (HEC) yog ib qho cellulose derivative uas tsis yog ionic nrog kev ua kom tuab zoo, muaj peev xwm hloov kho rheological thiab kev ruaj khov ntawm kev sib kis. Nws lub hauv paus tseem ceeb ntawm kev ua haujlwm hauv cov xim pleev xim suav nrog:
Kev kho kom tuab thiab kev hloov kho rheological: HEC tuaj yeem sib xyaw nrog cov dej molecules los ntawm kev sib txuas hydrogen los tsim cov txheej txheem hydration ruaj khov, ua rau kom muaj viscosity ntawm lub cev, tiv thaiv cov xim pigment los ntawm agglomerating thiab settling, thiab xyuas kom meej tias cov xim muab tshuaj txhuam tswj tau zoo thaum sawv ntsug lossis tsim kho.
Lub kaw lus dispersion ruaj khov: HEC muaj kev ua haujlwm zoo ntawm qhov chaw, tuaj yeem txheej cov xim me me, txhim kho lawv cov dispersibility hauv dej theem, tiv thaiv kev sib sau ua ke ntawm cov khoom me me, thiab yog li txo cov flocculation thiab agglomeration.
Kev tiv thaiv dej tsis ua haujlwm: HEC tuaj yeem tsim ib txheej tiv thaiv, qeeb qeeb qhov dej evaporation, tiv thaiv cov xim nplaum los ntawm thickening vim dej poob, thiab ntev lub sijhawm cia.
Kev tiv thaiv shear: HEC muab cov xim zoo thixotropy, txo cov viscosity nyob rau hauv lub zog shear siab, pab txhawb kev tsim kho, thiab tuaj yeem rov qab tau viscosity sai sai nyob rau hauv lub zog shear qis, txhim kho cov xim tiv thaiv kev ua tau zoo.
3. Cov txiaj ntsig ntawm hydroxyethyl cellulose hauv cov xim pleev xim
Ntxiv hydroxyethyl cellulose rau hauv lub tshuab pleev xim muaj cov txiaj ntsig zoo li nram no:
Txhim kho qhov ruaj khov ntawm cov xim muab tshuaj: HEC tuaj yeem tiv thaiv cov xim av thiab agglomeration, kom ntseeg tau tias cov xim muab tshuaj tswj tau qhov sib npaug tom qab khaws cia ntev.
Kev txhim kho kev ua tau zoo ntawm kev tsim kho: HEC muab cov xim nplaum zoo heev rau cov khoom rheological, ua rau nws yooj yim txhuam, dov lossis tsuag thaum lub sijhawm tsim kho, txhim kho kev hloov pauv ntawm cov xim.
Txhim kho dej tsis kam: HEC tuaj yeem txo qhov kev hloov pauv viscosity los ntawm dej evaporation, yog li ntawd cov xim muab tshuaj tuaj yeem tswj tau qhov ruaj khov zoo nyob rau hauv ntau yam xwm txheej ib puag ncig.
Kev sib raug zoo muaj zog: HEC yog cov khoom siv thickener uas tsis yog ionic, uas muaj kev sib raug zoo nrog feem ntau cov dispersants, cov neeg sawv cev ntub dej thiab lwm yam khoom ntxiv, thiab yuav tsis ua rau muaj kev tsis ruaj khov hauv cov txheej txheem formulation.
Kev tiv thaiv ib puag ncig thiab kev nyab xeeb: HEC yog los ntawm cov cellulose ntuj, ua tau raws li cov kev cai tiv thaiv ib puag ncig, tsis tso tawm cov tshuaj lom, thiab ua raws li kev tiv thaiv ntsuab thiab kev tiv thaiv ib puag ncig ntawm cov txheej txheem dej.
4. Kev siv thiab cov lus qhia ntawm hydroxyethyl cellulose
Yuav kom ua lub luag haujlwm zoo dua ntawm HEC, cov ntsiab lus hauv qab no yuav tsum tau sau tseg thaum siv nws hauv cov xim pleev xim:
Kev tswj hwm qhov ntau ntxiv: Tus nqi ntawm HEC feem ntau yog ntawm 0.2% -1.0%. Tus nqi tshwj xeeb ntawm kev siv yuav tsum tau kho raws li qhov xav tau ntawm lub kaw lus txheej txheem kom tsis txhob muaj viscosity ntau dhau thiab cuam tshuam rau kev ua haujlwm ntawm kev tsim kho.
Cov txheej txheem ua ntej: HEC yuav tsum tau muab faib thiab yaj rau hauv dej ua ntej, thiab tom qab ntawd ntxiv rau cov xim muab tshuaj tom qab tsim cov tshuaj sib xws kom ntseeg tau tias nws ua rau nws cov thickening thiab dispersing effects.
Siv nrog lwm cov khoom ntxiv: Nws tuaj yeem sib phim nrog cov dispersants, cov neeg sawv cev ntub dej, thiab lwm yam kom txhim kho qhov ruaj khov ntawm cov xim thiab ua kom zoo dua kev ua haujlwm ntawm txheej.
Tsis txhob muaj teeb meem kub siab: Qhov solubility ntawm HEC raug cuam tshuam los ntawm qhov kub thiab txias. Nws raug pom zoo kom yaj nws ntawm qhov kub thiab txias (25-50 ℃) kom tsis txhob muaj kev sib sau ua ke lossis tsis txaus yaj.
Hydroxyethyl cellulosemuaj txiaj ntsig zoo rau kev siv xim pleev xim. Nws tuaj yeem daws tau cov teeb meem ntawm cov xim pleev xim tuab thiab sib sau ua ke, thiab txhim kho kev ruaj khov ntawm kev khaws cia thiab kev ua haujlwm ntawm kev tsim kho. Nws qhov tuab, kev ruaj khov ntawm kev sib kis thiab kev tiv thaiv dej evaporation ua rau nws yog ib qho khoom siv tseem ceeb rau cov xim pleev xim dej. Hauv kev siv tiag tiag, kev hloov kho kom haum ntawm HEC koob tshuaj thiab txoj kev ntxiv tuaj yeem ua kom nws cov txiaj ntsig zoo tshaj plaws thiab txhim kho qhov zoo ntawm cov xim pleev xim. Nrog rau kev txhim kho cov xim pleev xim dej uas tsis ua rau ib puag ncig puas tsuaj, kev cia siab ntawm HEC yuav dav dua.
Lub sijhawm tshaj tawm: Plaub Hlis-09-2025