Hydroxypropyl methylcellulose, feem ntau hu ua HPMC, yog ntau yam, ntau hom polymer nrog ntau yam kev siv hauv kev lag luam suav nrog kev tsim kho, tshuaj thiab khoom noj. HPMC yog cellulose ether, uas txhais tau hais tias nws yog muab los ntawm cellulose, ib tug natural polymer muaj nyob rau hauv cov nroj tsuag. Nws yog feem ntau siv cellulose ether vim nws cov khoom tshwj xeeb thiab tus nqi qis.
Dissolving HPMC tuaj yeem yog cov txheej txheem tsis yooj yim, tshwj xeeb tshaj yog thaum sim kom tau txais ib qho kev daws teeb meem zoo sib xws. Hauv tsab xov xwm no, peb yuav tham txog qee yam tseem ceeb uas yuav tsum nco ntsoov thaum rhuav tshem HPMC kom ntseeg tau tias kev sib cais ua tiav thiab cov txiaj ntsig xav tau.
1.Purity ntawm HPMC
Lub purity ntawm HPMC tuaj yeem cuam tshuam nws cov solubility hauv dej thiab lwm yam kuab tshuaj. Yog li ntawd, nws yog ib qho tseem ceeb kom ntseeg tau tias HPMC siv tau zoo thiab purity. HPMC kis nrog lwm yam tshuaj yuav tsis yaj kom zoo, ua rau muaj pob lossis pob hauv cov tshuaj. Qhov no yuav cuam tshuam rau tag nrho cov kev ua tau zoo ntawm cov khoom uas muaj HPMC thiab yuav ua rau muaj teeb meem thaum lub sijhawm tsim khoom.
2. HPMC hom naj npawb
HPMC muaj nyob rau hauv qib sib txawv thiab qib viscosity, nrog rau txhua qib tsim los rau ib daim ntawv thov tshwj xeeb. Qib ntawm HPMC siv yuav txiav txim siab npaum li cas ntawm HPMC xav tau thiab nws qhov kub thiab txias. Nyob ntawm qib ntawm HPMC, qhov kub thiab lub sijhawm tawg yuav txawv. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum tau ua tib zoo nyeem thiab ua raws li cov chaw tsim khoom cov lus qhia txog tus nqi ntawm HPMC siv thiab qhov kub thiab txias uas yuav tsum tau ua kom muaj txiaj ntsig zoo.
3. Solvent thiab kub
Qhov kev xaiv ntawm cov kuab tshuaj siv thiab HPMC dissolution kub yog qhov tseem ceeb cuam tshuam rau cov txheej txheem dissolution. Dej yog cov kuab tshuaj feem ntau siv rau HPMC, thiab nws yog ib qho tseem ceeb kom ntseeg tau tias cov dej siv tau zoo thiab tsis muaj impurities. Cov dej tsis huv yuav muaj cov kab mob uas tuaj yeem cuam tshuam HPMC solubility thiab tag nrho cov khoom zoo.
Qhov kub ntawm HPMC yaj kuj ua lub luag haujlwm tseem ceeb. HPMC yaj zoo tshaj plaws hauv dej sov, nyiam dua ntawm 80-90 degrees Celsius. Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias qhov kub thiab txias yuav tsum tsis txhob siab dhau, txwv tsis pub HPMC yuav denatured thiab degraded, ua rau txo qis viscosity thiab ua haujlwm tsis zoo. Yog li ntawd, nws yog ib qho tseem ceeb kom ua tib zoo tswj qhov kub thiab txias ntawm cov kuab tshuaj kom ntseeg tau tias kev ua tau zoo thiab kev ua haujlwm zoo.
4. Sib tov thiab do
Kev sib xyaw thiab kev ntxhov siab yog qhov tseem ceeb los xyuas kom meej tias HPMC tawg tau zoo. Kev sib xyaw ua ke thiab kev ntxhov siab yuav pab rhuav tshem HPMC cov khoom thiab tsim kom muaj kev sib haum xeeb thiab zoo ib yam. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum tau siv txoj kev sib xyaw kom haum, xws li cov khoom siv sib xyaw ua ke siab, uas pab txhawb kev sib xyaw ua ke thiab muaj kev kub ntxhov hauv cov tshuaj.
5. Kev sib xyaw ntawm HPMC tshuaj
Qhov concentration ntawm HPMC hauv kev daws yog ib qho tseem ceeb uas yuav tsum tau xav txog thaum dissolving HPMC. Yog hais tias HPMC concentration siab dhau lawm, nws yuav ua rau clumps los yog agglomerates tsim nyob rau hauv cov kev daws teeb meem, ua rau nws nyuaj rau tau txais ib tug zoo tib yam tshuaj. Ntawm qhov tod tes, yog tias qhov concentration tsawg dhau, nws yuav ua rau muaj kev daws teeb meem ntau dhau thiab ua haujlwm tsis zoo.
nyob rau hauv xaus
HPMC yog ntau yam thiab ntau yam polymer nrog ntau yam kev siv hauv kev lag luam xws li kev tsim kho, tshuaj thiab zaub mov. Kev rhuav tshem ntawm HPMC tuaj yeem yog cov txheej txheem tsis yooj yim, thiab nws yog ib qho tseem ceeb uas yuav tsum ua tib zoo xav txog yam xws li purity, qib, hnyav, kub, sib tov, agitation, thiab concentration ntawm HPMC tov. Kev ua tiav tiav thiab cov txiaj ntsig xav tau tuaj yeem ua tiav los ntawm kev ua raws li cov chaw tsim khoom cov lus qhia thiab ua tib zoo tswj cov xwm txheej no.
Post lub sij hawm: Sep-22-2023