Hydroxyethyl cellulose (HEC) yog ib yam khoom siv uas siv tau ntau yam thiab siv dav hauv cov xim thiab cov txheej txheem. Nws ua haujlwm ntau yam, txhim kho kev ua tau zoo, kev ruaj khov, thiab kev siv cov khoom no. Hauv qab no yog phau ntawv qhia txog yuav ua li cas siv hydroxyethyl cellulose hauv cov xim thiab cov txheej txheem, suav nrog nws cov txiaj ntsig, cov txheej txheem siv, thiab cov kev xav txog kev tsim cov tshuaj.
Cov txiaj ntsig ntawm Hydroxyethyl Cellulose hauv cov xim thiab cov txheej txheem
Kev Hloov Kho Rheology: HEC muab cov yam ntxwv zoo thiab cov yam ntxwv sib npaug rau cov xim thiab cov txheej txheem, pab lawv kis tau zoo thiab txo qhov sagging.
Kev Txhim Kho Kev Ruaj Ntseg: Nws ua kom cov emulsion ruaj khov thiab tiv thaiv kev sib cais theem, ua kom muaj kev faib tawm ntawm cov xim thiab cov khoom sau.
Cov Khoom Siv Zoo Dua: Los ntawm kev kho qhov viscosity, HEC ua rau cov xim yooj yim dua rau kev siv, txawm tias los ntawm txhuam, menyuam, lossis tshuaj tsuag.
Kev Khaws Dej: HEC muaj cov khoom khaws dej zoo heev, uas yog qhov tseem ceeb rau kev tswj hwm kev ua haujlwm ntawm cov xim thiab cov txheej txheem, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej qhuav.
Kev Sib Tw: HEC yog sib xws nrog ntau yam tshuaj yaj, pigments, thiab lwm yam khoom ntxiv, ua rau nws haum rau ntau yam formulations.
Cov Txheej Txheem Thov
1. Kev Sib Xyaws Qhuav
Ib txoj kev siv los koom ua ke 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 cov hmoov HEC rau lwm cov khoom qhuav ntawm cov qauv.
Kauj Ruam 3: Xyuas kom meej tias sib tov kom huv si kom tsis txhob muaj kev sib sau ua ke.
Kauj Ruam 4: Maj mam ntxiv dej los yog cov kuab tshuaj thaum sib tov tas li kom txog thaum HEC tau hydrated tag thiab sib tov ua ke.
Kev sib xyaw qhuav yog qhov tsim nyog rau cov qauv uas xav tau kev tswj hwm qhov viscosity kom meej txij thaum pib.
2. Kev Npaj Cov Tshuaj
Kev npaj cov tshuaj HEC ua ntej muab tso rau hauv cov xim pleev xim yog lwm txoj hauv kev zoo:
Kauj Ruam 1: Muab HEC hmoov rau hauv dej lossis cov kuab tshuaj uas xav tau, kom ntseeg tau tias muaj kev sib xyaw tas li kom tiv thaiv kev tsim pob.
Kauj Ruam 2: Cia sijhawm txaus rau HEC kom hydrate thiab yaj tag, feem ntau yog ob peb teev lossis ib hmos.
Kauj Ruam 3: Ntxiv cov kua tshuaj no rau hauv cov xim pleev thaum do kom txog thaum tau txais qhov sib xws thiab cov yam ntxwv raws li xav tau.
Txoj kev no tso cai rau kev tuav thiab kev koom ua ke ntawm HEC yooj yim dua, tshwj xeeb tshaj yog hauv kev tsim khoom loj.
Cov Kev Xav Txog Kev Tsim Qauv
1. Kev Ntsuas
Qhov concentration ntawm HEC uas xav tau hauv cov xim pleev xim sib txawv nyob ntawm seb qhov viscosity thiab daim ntawv thov xav tau li cas:
Cov Ntawv Thov Qis-Shear: Rau kev siv txhuam los yog cov menyuam, qhov concentration qis dua ntawm HEC (0.2-1.0% los ntawm qhov hnyav) yuav txaus kom ua tiav qhov viscosity xav tau.
Cov Ntawv Thov High-Shear: Rau cov ntawv thov tsuag, yuav tsum muaj qhov concentration siab dua (1.0-2.0% los ntawm qhov hnyav) kom tiv thaiv kev sagging thiab xyuas kom meej tias muaj atomization zoo.
2. Kev Kho pH
Lub pH ntawm cov xim pleev xim tuaj yeem cuam tshuam rau qhov solubility thiab kev ua tau zoo ntawm HEC:
Qhov Zoo Tshaj Plaws pH: HEC zoo tshaj plaws hauv qhov nruab nrab mus rau me ntsis alkaline pH (pH 7-9).
Kev Kho Kom Zoo: Yog tias cov mis tshuaj no muaj kua qaub ntau dhau los yog alkaline ntau dhau, kho qhov pH siv cov khoom ntxiv xws li ammonia lossis cov organic acids kom ua tau zoo dua HEC.
3. Kub
Kub ua lub luag haujlwm tseem ceeb hauv kev ua kom dej thiab yaj ntawm HEC:
Dej Txias Yaj: Qee qib HEC yog tsim los yaj rau hauv dej txias, uas tuaj yeem ua kom yooj yim rau cov txheej txheem sib tov.
Kev Ua Kom Dej Sov Sai: Qee zaum, kev siv dej sov tuaj yeem ua kom cov txheej txheem hydration sai dua, tab sis yuav tsum zam qhov kub siab tshaj 60 ° C kom tiv thaiv kev puas tsuaj ntawm cov polymer.
4. Kev Sib Piv Nrog Lwm Cov Khoom Xyaw
HEC yuav tsum sib xws nrog lwm cov khoom xyaw hauv cov qauv kom tsis txhob muaj teeb meem xws li gel tsim lossis theem sib cais:
Cov kuab tshuaj: HEC sib xws nrog ob qho tib si dej-raws li thiab cov kuab tshuaj-raws li, tab sis yuav tsum tau ceev faj kom paub tseeb tias tag nrho cov yaj.
Cov xim thiab cov khoom sau: HEC pab tswj cov xim thiab cov khoom sau, kom ntseeg tau tias muaj kev faib tawm sib npaug thiab tiv thaiv kev nyob hauv av.
Lwm Cov Khoom Ntxiv: Qhov muaj cov surfactants, dispersants, thiab lwm yam khoom ntxiv tuaj yeem cuam tshuam rau qhov viscosity thiab kev ruaj khov ntawm HEC-thickened formulation.
Cov Lus Qhia Siv Tau Zoo Tshaj Plaws
Ua Ntej-Kev Yaj: Ua ntej-yaj HEC hauv dej ua ntej ntxiv rau hauv cov xim pleev xim tuaj yeem pab kom ntseeg tau tias muaj kev faib tawm sib npaug thiab tiv thaiv kev sib sau ua ke.
Ntxiv Qeeb: Thaum ntxiv HEC rau hauv cov mis, ua li ntawd qeeb qeeb thiab nrog kev sib xyaw tas mus li kom tsis txhob muaj pob.
Kev Sib Tov Siab-Shear: Siv cov khoom sib tov siab-shear yog tias ua tau, vim tias lawv tuaj yeem pab ua kom muaj kev sib xyaw zoo dua thiab tswj tau viscosity zoo dua.
Kev Kho Kom Zoo Dua: Kho qhov HEC concentration maj mam, sim cov viscosity thiab cov khoom siv tom qab txhua qhov ntxiv kom ua tiav qhov sib xws xav tau.
Cov Teeb Meem Feem Ntau thiab Kev daws teeb meem
Kev Ua Khub: Yog tias HEC raug ntxiv sai dhau los yog tsis sib tov txaus, nws tuaj yeem ua pob. Yuav kom tiv thaiv qhov no, maj mam yaj HEC hauv dej thaum do kom zoo.
Qhov Viscosity Tsis Sib Xws: Kev hloov pauv ntawm qhov kub thiab txias, pH, thiab qhov ceev sib tov tuaj yeem ua rau qhov viscosity tsis sib xws. Saib xyuas thiab kho cov kev ntsuas no tas li kom tswj tau qhov sib xws.
Ua npuas dej: HEC tuaj yeem ua rau huab cua nkag mus rau hauv cov mis, ua rau ua npuas dej. Siv cov tshuaj defoamers lossis cov neeg sawv cev tiv thaiv kev ua npuas dej kom txo qhov teeb meem no.
Hydroxyethyl cellulose yog ib qho khoom muaj nqis heev hauv cov xim pleev thiab cov txheej txheem vim nws muaj peev xwm txhim kho viscosity, stability, thiab cov khoom siv. Los ntawm kev nkag siab txog cov txheej txheem zoo tshaj plaws rau kev koom ua ke HEC, kho cov qauv tsim, thiab daws teeb meem cov teeb meem feem ntau, cov chaw tsim khoom tuaj yeem tsim cov khoom pleev xim zoo, sib xws, thiab yooj yim siv. Txawm hais tias los ntawm kev sib xyaw qhuav lossis kev npaj cov tshuaj, qhov tseem ceeb yog nyob rau hauv kev sib xyaw ua ke, kev hloov pH, thiab kev tswj qhov kub kom siv tag nrho cov txiaj ntsig ntawm HEC.
Lub sijhawm tshaj tawm: Tsib Hlis-28-2024