Hydroxyethyl cellulose (HEC) yog ntau yam thiab siv dav hauv cov xim thiab cov xim. Nws ua haujlwm ntau yam, txhim kho kev ua tau zoo, ruaj khov, thiab siv cov khoom siv ntawm cov khoom no. Hauv qab no yog cov lus qhia dav dav txog yuav ua li cas siv hydroxyethyl cellulose zoo hauv cov xim thiab txheej, npog nws cov txiaj ntsig, cov txheej txheem siv, thiab kev xav txog kev tsim.
Cov txiaj ntsig ntawm Hydroxyethyl Cellulose hauv Xim thiab Txheej
Kev Hloov Kho Rheology: HEC muab cov kev xav tau txaus thiab qib cov yam ntxwv rau cov xim thiab cov txheej txheem, pab lawv kom sib npaug sib npaug thiab txo qis sagging.
Stability Enhancement: Nws stabilizes lub emulsion thiab tiv thaiv theem kev sib cais, kom ntseeg tau lub uniform faib ntawm pigments thiab fillers.
Txhim kho Daim Ntawv Thov Khoom: Los ntawm kev kho cov viscosity, HEC ua rau cov xim yooj yim rau kev thov, tsis hais los ntawm txhuam, cov menyuam, lossis tshuaj tsuag.
Kev tuav dej: HEC muaj cov khoom tuav dej zoo heev, uas yog qhov tseem ceeb rau kev tswj xyuas kev ua haujlwm ntawm cov xim thiab coatings, tshwj xeeb tshaj yog nyob rau hauv qhuav qhuav.
Compatibility: HEC yog sib xws nrog ntau yam ntawm cov kuab tshuaj, pigments, thiab lwm yam additives, ua rau nws haum rau ntau yam formulations.
Txoj kev thov
1. Kev sib xyaw qhuav
Ib txoj hauv kev los sib xyaw HEC rau hauv cov xim pleev xim yog los ntawm kev sib xyaw qhuav:
Kauj Ruam 1: Ntsuas qhov xav tau ntawm HEC hmoov.
Kauj Ruam 2: Maj mam ntxiv HEC hmoov rau lwm cov khoom xyaw qhuav ntawm cov qauv.
Kauj ruam 3: Xyuas kom meej sib tov kom tsis txhob clumping.
Kauj Ruam 4: Maj mam ntxiv dej los yog hnyav thaum sib tov tas li kom txog thaum HEC muaj dej txaus thiab sib xyaw ua kom tiav.
Kev sib xyaw qhuav yog tsim rau cov qauv uas muaj kev tswj xyuas meej ntawm cov viscosity los ntawm qhov pib.
2. Kev npaj daws teeb meem
Npaj ib qho kev daws teeb meem ntawm HEC ua ntej muab tso rau hauv cov xim pleev xim yog lwm txoj hauv kev zoo:
Kauj Ruam 1: Disperse HEC hmoov hauv dej los yog cov kuab tshuaj uas xav tau, ua kom muaj kev ntxhov siab tsis tu ncua los tiv thaiv pob tsim.
Kauj Ruam 2: Cia sij hawm txaus rau HEC kom muaj dej txaus thiab yaj, feem ntau ob peb teev lossis hmo ntuj.
Kauj Ruam 3: Ntxiv cov tshuaj no rau cov xim pleev xim thaum nplawm kom txog thaum qhov kev xav tau sib xws thiab cov khoom tiav.
Txoj kev no tso cai rau kom yooj yim tuav thiab koom ua ke ntawm HEC, tshwj xeeb tshaj yog nyob rau hauv cov khoom loj.
Formulation xav txog
1. Kev xav
Qhov concentration ntawm HEC xav tau nyob rau hauv cov xim xim txawv nyob ntawm seb qhov xav tau viscosity thiab daim ntawv thov txoj kev:
Low-Shear Applications: Rau cov txhuam los yog cov ntawv thov, qhov qis dua ntawm HEC (0.2-1.0% los ntawm qhov hnyav) yuav txaus kom ua tiav qhov xav tau viscosity.
High-Shear Applications: Rau kev siv tshuaj tsuag, qhov siab dua (1.0-2.0% los ntawm qhov hnyav) yuav tsim nyog los tiv thaiv sagging thiab xyuas kom zoo atomization.
2. Kev hloov pH
Cov pH ntawm cov xim pleev xim tuaj yeem cuam tshuam rau solubility thiab kev ua haujlwm ntawm HEC:
Optimal pH Range: HEC yog qhov zoo tshaj plaws nyob rau hauv nruab nrab mus rau me ntsis alkaline pH ntau (pH 7-9).
Kev Kho Kom Zoo: Yog tias cov qauv tsim muaj kua qaub dhau los yog alkaline dhau lawm, kho cov pH siv cov khoom siv tsim nyog xws li ammonia lossis organic acids txhawm rau txhim kho HEC kev ua tau zoo.
3. Kub
Qhov kub thiab txias ua lub luag haujlwm tseem ceeb hauv hydration thiab dissolution ntawm HEC:
Cov Dej Txias Soluble: Qee qib HEC yog tsim los ua kom yaj hauv dej txias, uas tuaj yeem ua kom yooj yim rau kev sib xyaw.
Kev Siv Dej Kub Ceev: Qee zaus, kev siv dej sov tuaj yeem ua kom cov txheej txheem hydration, tab sis qhov kub siab tshaj 60 ° C yuav tsum tau zam kom tsis txhob degradation ntawm cov polymer.
4. Kev sib xyaw nrog lwm cov khoom xyaw
HEC yuav tsum tau sib haum nrog lwm cov khoom xyaw hauv kev tsim kom tsis txhob muaj teeb meem xws li gel tsim los yog theem sib cais:
Cov kuab tshuaj: HEC yog sib xws nrog ob qho tib si dej-raws li thiab hnyav-raws li tshuab, tab sis yuav tsum tau saib xyuas kom ntseeg tau tias kev sib cais tiav.
Pigments thiab Fillers: HEC pab kom ruaj khov pigments thiab muab tub lim, ua kom muaj kev sib faib sib luag thiab tiv thaiv kev daws teeb meem.
Lwm yam Additives: Lub xub ntiag ntawm surfactants, dispersants, thiab lwm yam additives tuaj yeem cuam tshuam rau viscosity thiab stability ntawm HEC-thickened formulation.
Cov tswv yim tswv yim rau kev siv zoo
Pre-Dissolution: Pre-dissolving HEC hauv dej ua ntej muab ntxiv rau cov xim pleev xim tuaj yeem pab ua kom muaj kev sib txawv thiab tiv thaiv clumping.
Slow Ntxiv: Thaum ntxiv HEC rau cov qauv, ua kom maj mam thiab nrog kev ntxhov siab tas mus li kom tsis txhob muaj pob.
High-Shear Mixing: Siv cov khoom sib tov sib xyaw ua ke yog tias ua tau, vim tias lawv tuaj yeem pab ua kom muaj kev sib xyaw ua ke ntau dua thiab tswj cov viscosity zoo dua.
Incremental Adjustment: Kho HEC concentration incrementally, kuaj cov viscosity thiab daim ntawv thov zog tom qab txhua qhov sib ntxiv kom ua tiav qhov xav tau sib xws.
Cov Teeb Meem Feem Ntau thiab Kev daws teeb meem
Lumping: Yog tias HEC ntxiv sai dhau los yog tsis muaj qhov sib xyaw txaus, nws tuaj yeem tsim cov pob. Txhawm rau tiv thaiv qhov no, disperse HEC nyob rau hauv dej maj mam thaum stirring nquag.
Inconsistent Viscosity: Variations nyob rau hauv qhov kub thiab txias, pH, thiab sib tov ceev yuav ua rau inconsistent viscosity. Tsis tu ncua saib xyuas thiab kho cov kev txwv no kom muaj kev sib haum xeeb.
Foaming: HEC tuaj yeem qhia cov cua rau hauv cov qauv, ua rau foaming. Siv cov defoamers lossis cov tshuaj tiv thaiv ua npuas ncauj kom txo tau qhov teeb meem no.
Hydroxyethyl cellulose yog ib qho tseem ceeb ntawm cov xim thiab txheej txheej vim nws lub peev xwm los txhim kho viscosity, stability, thiab daim ntawv thov zog. Los ntawm kev nkag siab txog cov kev pom zoo rau kev sib koom ua ke HEC, kho cov txheej txheem tsim, thiab daws cov teeb meem sib txawv, cov tuam txhab tsim khoom tuaj yeem tsim cov khoom lag luam zoo, zoo ib yam, thiab cov neeg siv khoom xim xim. Txawm hais tias los ntawm kev sib xyaw qhuav lossis kev npaj daws, qhov tseem ceeb nyob hauv kev sib xyaw ua ke, hloov pH, thiab tswj qhov kub thiab txias kom ua tiav cov txiaj ntsig ntawm HEC.
Post lub sij hawm: May-28-2024