Kev sib xyaw hydroxyethyl cellulose (HEC) yog ib txoj haujlwm uas yuav tsum muaj kev tswj xyuas meej thiab kev txawj ntse. HEC yog cov dej-soluble polymer cov khoom siv dav siv hauv kev tsim kho, txheej txheej, tshuaj, tshuaj niaj hnub thiab lwm yam lag luam, nrog thickening, suspension, bonding, emulsification, film-forming, tiv thaiv colloid thiab lwm yam haujlwm.
1. Xaiv qhov nruab nrab dissolving tsim nyog
HEC feem ntau yog yaj hauv dej txias, tab sis nws kuj tuaj yeem yaj hauv cov kuab tshuaj organic xws li ethanol thiab cov dej sib tov, ethylene glycol, thiab lwm yam. Thaum dissolves, xyuas kom meej lub purity ntawm nruab nrab, tshwj xeeb tshaj yog thaum yuav tsum tau ib tug pob tshab tov los yog thaum nws yog. siv nyob rau hauv high-kev thov. Cov dej zoo yuav tsum tsis muaj impurities, thiab cov dej tawv yuav tsum tau zam kom tsis txhob cuam tshuam rau cov dej solubility thiab kev daws teeb meem.
2. Tswj cov dej kub
Cov dej kub muaj qhov cuam tshuam zoo rau kev tawg ntawm HEC. Feem ntau hais lus, dej kub yuav tsum khaws cia ntawm 20 ° C thiab 25 ° C. Yog tias cov dej kub siab dhau lawm, HEC yog ib qho yooj yim rau agglomerate thiab tsim cov gel loj uas nyuaj rau yaj; Yog tias cov dej kub tsawg dhau, qhov kev sib cais yuav qeeb, cuam tshuam rau kev sib xyaw ua haujlwm. Yog li ntawd, xyuas kom meej tias cov dej kub nyob rau hauv ib tug haum ntau yam ua ntej sib tov.
3. Kev xaiv cov khoom sib xyaw
Kev xaiv cov khoom siv sib xyaw yog nyob ntawm qhov kev thov tshwj xeeb thiab kev tsim khoom. Rau kev ua haujlwm me me lossis kev sim ua haujlwm, siv lub tshuab ntxhua khaub ncaws lossis tes tuav. Rau kev tsim khoom loj, lub siab shear tov lossis disperser yuav tsum tau ua kom zoo sib xws thiab zam kev tsim cov gel blocks. Lub stirring ceev ntawm cov khoom siv yuav tsum yog nruab nrab. nrawm dhau yuav ua rau huab cua nkag mus rau hauv cov tshuaj thiab tsim npuas; qeeb dhau yuav tsis cuam tshuam HEC zoo.
4. HEC ntxiv txoj kev
Txhawm rau kom tsis txhob tsim cov gel pawg thaum lub sijhawm tawg ntawm HEC, HEC feem ntau yuav tsum tau ntxiv maj mam hauv qab nplawm. Cov kauj ruam tshwj xeeb yog raws li nram no:
Initial stirring: Nyob rau hauv lub npaj dissolution nruab nrab, pib lub agitator thiab do ntawm nruab nrab ceev kom tsim ib tug ruaj khov vortex nyob rau hauv cov kua.
Maj mam ntxiv: Maj mam thiab sib npaug ntawm HEC hmoov rau hauv lub vortex, tsis txhob ntxiv ntau dhau ntawm ib zaug kom tsis txhob muaj kev sib txuam. Yog tias ua tau, siv lub sieve lossis funnel los tswj qhov nrawm ntxiv.
Nruam nplawm: Tom qab HEC tau ntxiv tag nrho, txuas ntxiv stirring rau ib lub sij hawm, feem ntau 30 feeb mus rau 1 teev, kom txog rau thaum cov tshuaj yog pob tshab thiab tsis muaj undissolved hais.
5. Kev tswj lub sijhawm tawg
Lub sij hawm dissolution nyob ntawm qib viscosity ntawm HEC, qhov kub ntawm qhov nruab nrab dissolving thiab stirring tej yam kev mob. HEC nrog qib viscosity siab yuav tsum tau siv sijhawm ntev dua. Feem ntau, nws yuav siv li 1 mus rau 2 teev rau HEC kom yaj tag. Yog tias siv cov cuab yeej shear siab, lub sijhawm tawg tuaj yeem ua kom luv, tab sis kev sib tw ntau dhau yuav tsum tau zam kom tsis txhob muaj kev puas tsuaj rau cov qauv molecular ntawm HEC.
6. Ntxiv lwm cov khoom xyaw
Thaum lub sij hawm dissolution ntawm HEC, lwm yam khoom xyaw yuav tsum tau ntxiv, xws li preservatives, pH adjusters los yog lwm yam functional additives. Cov khoom xyaw no yuav tsum tau maj mam ntxiv tom qab HEC yaj tag, thiab nplawm yuav tsum tau txuas ntxiv kom ntseeg tau tias muaj kev sib faib.
7. Khaws cov tshuaj
Tom qab sib tov, HEC tov yuav tsum muab cia rau hauv lub thawv kaw kom tsis txhob muaj dej evaporation thiab microbial paug. Qhov chaw cia khoom yuav tsum tau ceev kom huv si, qhuav thiab deb ntawm tshav ntuj ncaj qha. Tus nqi pH ntawm cov tshuaj yuav tsum tau hloov mus rau qhov tsim nyog (feem ntau 6-8) kom ntev lub sijhawm cia.
8. Kev tshuaj xyuas zoo
Tom qab sib tov, nws raug nquahu kom ua qhov kev soj ntsuam zoo ntawm cov tshuaj, feem ntau yog kuaj tsis xws li viscosity, pob tshab thiab pH tus nqi ntawm cov tshuaj kom ntseeg tau tias nws ua tau raws li qhov xav tau. Yog tias tsim nyog, kev kuaj kab mob microbial kuj tuaj yeem ua kom ntseeg tau tias kev nyiam huv ntawm cov tshuaj.
Hydroxyethyl cellulose tuaj yeem ua tau zoo sib xyaw kom tau txais cov txiaj ntsig zoo HEC kom tau raws li qhov xav tau ntawm ntau qhov chaw thov. Thaum lub sijhawm ua haujlwm, txhua qhov txuas yog tswj hwm nruj kom tsis txhob muaj kev ua haujlwm tsis raug thiab xyuas kom meej qhov sib xyaw ua ke thiab qhov zoo ntawm cov khoom kawg.
Post lub sij hawm: Aug-21-2024