Thickening cov neeg sawv cev zoo li hydroxyethyl cellulose (HEC) feem ntau siv nyob rau hauv ntau yam kev lag luam, tshuaj, thiab khoom noj khoom haus, kom txhim kho cov qauv tsim qauv. HEC yog tsis-ionic, dej-soluble polymer muab tau los ntawm cellulose thiab yog zoo li nws muaj peev xwm los ua cov kev daws teeb meem meej thiab ruaj khov. Yog tias koj tab tom nrhiav kom tuab ntawm cov tshuaj uas muaj hec, muaj ntau cov tswv yim koj tuaj yeem ntiav.
1.Usthans cellulose cellulose (HEC)
Cov qauv tshuaj: HEC yog qhov ua kom pom tseeb ntawm cellulose, uas yog ib txwm muaj tshwm sim polymer pom hauv cov nroj tsuag. Los ntawm kev hloov kho tshuaj lom neeg, cov pab pawg hydroxyethyl tau qhia rau hauv cov qauv cellulose, txhim kho nws cov dej solubility thiab thickenies cov khoom.
Dej solubility: Hec yog soluble heev hauv dej, sib sau meej thiab khov kho cov kev daws teeb meem ntau ntau yam ntawm ntau yam ntawm ntau yam ntawm ntau ntau.
Thickening lub tshuab: Hec thickens daws teeb meem feem ntau los ntawm nws lub peev xwm rau kev ua haujlwm thiab cuab kav dej lwg me me, tsim lub network uas ua rau viscosity.
2.techniques rau thickening HEC kev daws teeb meem
Kev nce ntxiv: ib txoj hauv kev yooj yim tshaj plaws los ua kom muaj kev daws teeb meem uas muaj hec yog txhawm rau nce nws cov kev xav tau. Raws li cov concentration ntawm HEC hauv kev daws teeb meem, yog li nws puas yog nws viscosity. Txawm li cas los xij, tej zaum yuav muaj qhov kev txwv rau qhov siab tshaj plaws vim muaj cov khoom siv solubility thiab cov khoom xav tau.
Hydration lub sijhawm: Tso cai Hec rau hydrate puv ua ntej siv tuaj yeem txhim kho nws cov tuab. Hydration lub sijhawm hais txog lub sijhawm yuav tsum tau rau hec hais kom swell thiab disperse uniformly nyob rau hauv cov kuab tshuaj. Cov sijhawm dej ntau dua ib txwm ua rau cov kev daws teeb meem tuab.
Kev tswj qhov kub thiab txias: kub tuaj yeem cuam tshuam lub viscosity ntawm HEC kev daws teeb meem. Nyob rau hauv dav dav, siab dua sim siab txo cov viscosity vim txo cov kab hlau polymer entanglement. Hloov siab, txo qis qhov kub yuav nce viscosity. Txawm li cas los xij, kev kub ntxhov heev yuav cuam tshuam kev daws teeb meem los yog ua rau gelation.
PH hloov kho: lub ph ntawm qhov kev daws teeb meem tuaj yeem cuam tshuam kev ua haujlwm ntawm Hec ua cov tuab tuab. Thaum HEc yog ruaj khov tshaj li ntau hom ntau, kho cov xov tooj dav, feem ntau nyob ib ncig) tuaj yeem txhim kho tuab ua tuab.
Co-solvents: qhia co-solvents tau tshaj tawm tau tshaj tawm nrog Hlycols lossis dej cawv, tuaj yeem hloov cov khoom siv thiab txhim kho cov tuab. Co-solvents yuav pab txhawb kev dispersion thiab hydration, ua rau muaj viscosity ntau ntxiv.
Shear tus nqi: Shear tus nqi, lossis tus nqi ntawm kev ntxhov siab yog thov rau kev daws, tuaj yeem cuam tshuam txog kev daws teeb meem ntawm HEC. Cov nqi sib cav siab dua feem ntau yuav ua rau viscosity vim muaj kev sib ncag thiab kev taw qhia ntawm polymer cov saw hlau. Hloov siab, qis dua cov nqi sib zog txo qis viscosity.
Ntxiv rau ntawm salts: nyob rau hauv qee kis, xws li ntsev chloride lossis poov tshuaj tshuaj dawb los yog muaj peev xwm txhim kho cov tuab tuab ntawm HEC. Cov ntsev yuav ua kom muaj lub zog ionic ntawm txoj kev daws teeb meem, ua rau muaj kev sib cuam tshuam polymer muaj zog polymer thiab viscosity ntau dua.
Kev sib xyaw ua ke nrog lwm cov thickeners: sib txuas nrog rau lwm cov post thickeners lossis cov pos hniav uas muaj cov guargant, tuaj yeem txhim kho cov pos hniav uas muaj zog, tuaj yeem txhim kho kev tsim tawm tag nrho ruaj khov.
3.Practical txiav txim siab
Kev ntsuas kev sib raug zoo: ua ntej sib txuam nrog kev tsim tawm lossis ua haujlwm rau kev ntsuas kom ntseeg tau tias txhua yam sib txuas lus sib raug zoo. Kev ntsuas kev sib raug zoo tuaj yeem txheeb xyuas cov teeb meem muaj peev xwm xws li theem sib cais, gelation, lossis txo cov txiaj ntsig.
Kev ua kom zoo: thickening hec cov kev daws teeb meem feem ntau yuav tsum tau sib npaug ntawm viscosity, kev sib txawv, thiab lwm yam tsim tsim. Kev ua kom zoo yuav cuam tshuam nrog kev ua kom zoo xws li kev ua kom muaj HEC kom zoo, Ph, ntsuas kub, thiab cov ntxiv kom ua tiav cov khoom lag luam xav tau.
Tsim cov qauv ruaj khov: Thaum HEC feem ntau ruaj khov nyob rau hauv ntau yam ntawm cov xwm txheej, qee yam xws li huab cua txias, lossis tsis sib xws yuav cuam tshuam kev ruaj ntseg. Ua tib zoo ua qauv tsim qauv thiab kev coj ruaj khov yog qhov tseem ceeb kom ntseeg tau cov khoom lag luam zoo thiab kev ua tau zoo dhau sijhawm.
Kev txiav txim siab tswj hwm: nyob ntawm cov khoom thov thickened, cov lus qhia kev tswj hwm cov khoom xyaw uas sau tau cov khoom xyaw, thiab kev sau npe, thiab cov ntawv sau npe. Nws yog qhov tseem ceeb rau kev ua raws li cov cai uas muaj feem xyuam thiab cov qauv los xyuas kom meej ua raws cai thiab cov neeg siv khoom nyab xeeb.
Thickening cov kev daws teeb meem muaj hydroxyethyl cellulose (HEC) yuav tsum nkag siab txog nws cov khoom thiab ntau hom kev kawm kom ua kom muaj viscosity thiab kev ruaj khov. Los ntawm kho cov ntsiab lus xws li cov pej xeem, hydration sij hawm, ntsuas kub, nws muaj peev xwm ua rau hac tsim kom tau raws li kev thov kev cai. Txawm li cas los xij, kev ua tiav qhov xav tau cov nyhuv tuab thaum tswj cov kev paub meej, kev ua kom tau kev sim ua ntej, thiab kev ua kom zoo dua qub, thiab kev ua raws li kev tswj hwm cov lus qhia. Nrog kev tsim kom zoo tsim qauv thiab kev sim, HEC tuaj yeem ua cov neeg sawv cev tuab tuab thoob plaws ntau yam kev ua haujlwm, txhim kho cov khoom lag luam uas suav tsis txheeb.
Lub Sijhawm Post: Mar-29-2024