Hydroxyethyl cellulose (HEC) yog ib qho ntau yam thiab dav siv thickening tus neeg sawv cev hauv cov xim tha xim thiab pleev xim. Nws pab ntau lub zog, txhim kho kev ua yeeb yam, ruaj khov, thiab cov khoom siv ntawm cov khoom no. Hauv qab no yog cov phau ntawv qhia daws teeb meem ntawm kev siv hydroxyethyl cellulose hauv cov xim tsev thiab txheej, cov hau kev, thiab kev xav txog kev sib cav.
Cov txiaj ntsig ntawm hydroxyethyl cellulose hauv cov xim tha xim thiab txheej
Rheology kev kho mob: HEC coj los ua kom txaus thiab ntws mus rau cov xim tsev thiab pleev xim, pab lawv kom kis tau tus mob tusyees thiab txo sagging.
Kev ruaj khov txhim kho: nws stabilizes tshem tawm cov emulsion thiab tiv thaiv theem sib cais, kom muaj kev faib tawm ntawm cov pigments thiab fillers.
Txhim kho cov khoom thov: los ntawm kev kho lub viscosity, ho ua rau cov xim yooj yim los thov, txawm yog txhuam los ntawm txhuam, cov menyuam, lossis tshuaj tsuag, lossis tshuaj tsuag.
Dej khaws cia: HEC muaj cov dej ua haujlwm zoo heev, uas yog qhov tseem ceeb rau kev tswj hwm cov xim muaj xim thiab pleev xim, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej qhuav.
Kev sib txuam: Hec yog sib xws nrog ntau hom kuab tshuaj, thiab lwm yam ntxiv, ua rau nws haum rau ntau yam qauv.
Txoj kev thov
1. Kev Blend
Ib txoj kev sib txuam los ua kom haum hec rau hauv cov xim tsim qauv yog los ntawm kev sib tua qhuav:
Kauj ruam 1: Ntsuas qhov yuav tsum tau ntawm HEC hmoov.
Kauj ruam 2: maj ntxiv cov hec hmoov ntxiv rau lwm cov khoom qhuav ntawm cov qauv.
Kauj ruam 3: Ua kom meej meej kev sib xyaw kom tsis txhob muaj clumping.
Kauj Ruam 4: Maj mam ntxiv dej lossis cov kuab tshuaj thaum sib xyaw ua ke kom txog thaum lub Hec yog cov sib xyaw ua ke tau tiav.
Kev sib xyaw qhuav yog tsim nyog rau cov qauv uas tswj tau meej tswj cov viscosity yog xav tau txij thaum pib.
2. Kev npaj daws
Npaj kev daws teeb meem ntawm HEC ua ntej sib txuam nrog nws mus rau cov xim tsim yog lwm txoj kev ua tau zoo:
Kauj Ruam 1: Disperse Hec hmoov nyob rau hauv dej los yog cov kuab tshuaj uas xav tau, ua kom muaj kev ntxhov siab tsis tu ncua los tiv thaiv pob.
Kauj Ruam 2: Cia lub sijhawm txaus rau HEC kom muaj dej siab thiab yaj tag li ob peb teev lossis hmo ntuj.
Kauj ruam 3: Ntxiv cov kev daws teeb meem no mus rau cov xim tsim thaum nplawm kom txog thaum cov khoom xav tau ua tiav.
Cov qauv no tso cai rau kev tuav yooj yim thiab ua kev sib xyaw ua ke ntawm HEC, tshwj xeeb tshaj yog nyob rau hauv ntau heev-teev ntau lawm.
Kev Txiav Txim Siab
1. Lub siab
Cov concentration ntawm hec yuav tsum muaj nyob rau hauv daim xim tsim kev sib txawv raws li qhov xav tau viscosity thiab txoj kev xaiv:
Cov ntawv thov qis-shears: rau txhuam lossis cov menyuam daim ntawv thov, txo qis ntawm HEC (0.2-1.0% los ntawm qhov hnyav) yuav ua tiav cov viscosity xav tau.
Cov ntawv thov siab shears: rau cov ntaub ntawv txau, muaj ntau dua (1.0-2.0% los ntawm qhov hnyav) yuav tsim nyog los tiv thaiv sagging thiab xyuas kom meej atomization zoo.
2. PHEEJ YOOJ YIM
PHEM NTAWM COV ZAJ DEJ TXAWV YUAV TSUM TAU RAU SOLUBILDANY THIAB KEV UA HAUJ LWM NTAWM HEC:
Zoo tshaj plaws photion: HEC yog qhov ua tau zoo tshaj plaws nyob rau hauv nruab nrab mus rau me nyuam yaus ib txwm muaj (ph 7-9).
Hloov kho: Yog tias cov qauv tsim yog cov kua qaub dhau los yog siv cov pH uas haum rau cov ammonia lossis cov organic acids los ua kom ua kom zoo rau Hec kev ua tau zoo.
3. Kub
Qhov kub thiab txias ua lub luag haujlwm tseem ceeb hauv kev hydration thiab kev sib cais ntawm HEC:
Cov dej txias dej soluble: Qee cov qib yog tsim los kom yaj hauv dej txias, uas tuaj yeem yooj yim ntawm cov txheej txheem sib xyaw.
Sov dej kub nrawm: Hauv qee kis, siv dej sov tuaj yeem nrawm dua 60 ° C yuav tsum zam kom tsis txhob ua kom tsis txhob muaj kev cuam tshuam ntawm cov polymer.
4. Kev sib raug zoo nrog lwm cov khoom xyaw
Hec yuav tsum tau sib xws nrog lwm cov khoom xyaw hauv kev tsim kom tsis txhob muaj teeb meem xws li gel tsim lossis theem sib cais:
Cov kuab tshuaj: HEC tau sib haum nrog cov dej thiab cov kuab kev siv hluav taws xob, tab sis kev saib xyuas yuav tsum tau noj kom ua kom tiav kev sib cais.
Pigments thiab fec pab kom ruaj khov pigments thiab fillers, kom muaj kev faib tawm cov kev faib tawm thiab tiv thaiv kev daws teeb meem.
Lwm yam kev sib ntxiv: muaj cov surfactants, dispersants, thiab lwm yam kev ntxiv tuaj yeem cuam tshuam rau viscosity thiab ruaj khov ntawm hec-thickened tsim.
Cov lus qhia tswv yim rau kev siv tau zoo
Ua ntej-xaus: ua ntej yaj hec hauv dej ua ntej ntxiv nws rau cov xim tsim tau tuaj yeem pab kom ua kom muaj kev faib tawm cov kev faib tawm hauv qab thiab tiv thaiv clumping.
Qaum qeeb ntxiv: Thaum ntxiv Hec rau cov qauv, ua kom qeeb thiab nrog kev ntxhov siab tsis tu ncua kom tsis txhob muaj cov lumps.
High-shear sib xyaw: siv cov tshuaj xyaw high-shear golders yog tias ua tau, raws li lawv tuaj yeem pab ua tiav txoj kev sib xyaw ntau homogeneous thiab zoo dua viscosity tswj.
Kev hloov kho kev hloov kho ntxiv: Kho lub HEC muaj kev nce qib siab ntxiv, kuaj cov viscocosity thiab cov khoom siv viscocties tom qab txhua qhov ntxiv kom ua tiav qhov xav tau.
Cov teeb meem tshwm sim thiab kev daws teeb meem
Lumping: Yog tias HEC tau ntxiv nrawm dhau los yog tsis muaj kev sib xyaw txaus, nws tuaj yeem tsim cov qog. Txhawm rau tiv thaiv qhov no, disperse hac nyob rau hauv dej maj mam thaum nplawm tus nquag.
Inconentent viscosity: kev hloov pauv hauv qhov kub, Ph, thiab kev sib xyaw ua ke tuaj yeem ua rau muaj kev tsis sib haum. Saib xyuas ib txwm ua thiab kho cov kev ntsuas no txhawm rau tswj cov kev sib dhos.
Foaming: HEC tuaj yeem ua kom muaj huab cua mus rau hauv kev tsim qauv, ua kom ua npuas ncauj. Siv cov tshuaj tiv thaiv lossis cov neeg sawv cev ua npuas ncauj kom txo cov teeb meem no.
Hydroxyethyl cellulose yog ib qho kev sib xyaw ua ke nyob rau hauv cov xim thiab txheej ua qauv tsim vim nws muaj peev xwm txhim kho viscosity, kev ruaj khov, thiab cov khoom siv. Los ntawm kev nkag siab cov hau kev zoo rau kev sib xyaw ua ke, thiab daws cov teeb meem sib txawv, thiab cov chaw tsim khoom tuaj yeem tsim cov khoom lag luam zoo, thiab cov neeg siv-tus neeg siv xim zoo nkauj. Txawm hais tias los ntawm kev sib xyaw ua ke qhuav los yog cov kev npaj siab, cov kev hloov kho tsis zoo, ua kom haum rau pawj, thiab kub thiab txias rau kev siv roj kom zoo dua ntawm Hec.
Lub Sijhawm Post: Lub Tsib Hlis-28-2024