Hydroxypropyl methylcellulose, feem ntau hu ua HPMC, yog ib qho polymer uas siv tau ntau yam, muaj ntau yam kev siv hauv kev lag luam xws li kev tsim kho, tshuaj thiab khoom noj. HPMC yog cellulose ether, uas txhais tau tias nws yog los ntawm cellulose, ib qho polymer ntuj uas pom muaj nyob rau hauv cov nroj tsuag. Nws yog cellulose ether uas siv ntau tshaj plaws vim nws cov khoom tshwj xeeb thiab tus nqi qis.
Kev yaj HPMC tuaj yeem yog ib qho txheej txheem nyuaj, tshwj xeeb tshaj yog thaum sim kom tau txais cov tshuaj sib xws thiab sib xws. Hauv tsab xov xwm no, peb yuav tham txog qee yam tseem ceeb uas yuav tsum nco ntsoov thaum yaj HPMC kom ntseeg tau tias kev yaj tiav thiab cov txiaj ntsig xav tau.
1. Kev huv ntawm HPMC
Qhov huv ntawm HPMC tuaj yeem cuam tshuam rau nws qhov kev yaj hauv dej thiab lwm cov kuab tshuaj. Yog li ntawd, nws yog ib qho tseem ceeb kom ntseeg tau tias HPMC siv yog qhov zoo thiab huv si. HPMC uas muaj lwm yam tshuaj lom neeg yuav tsis yaj kom zoo, ua rau muaj cov pob me me hauv cov tshuaj. Qhov no yuav cuam tshuam rau kev ua haujlwm tag nrho ntawm cov khoom uas muaj HPMC thiab yuav ua rau muaj teeb meem thaum lub sijhawm tsim khoom.
2. Tus lej hom HPMC
HPMC muaj nyob rau hauv ntau qib thiab qib viscosity sib txawv, nrog txhua qib tsim rau ib daim ntawv thov tshwj xeeb. Qib ntawm HPMC siv yuav txiav txim siab qhov ntau ntawm HPMC xav tau thiab nws qhov kub yaj. Nyob ntawm qib ntawm HPMC, qhov kub yaj thiab lub sijhawm yuav txawv. Yog li ntawd, nws yog ib qho tseem ceeb kom nyeem thiab ua raws li cov lus qhia ntawm cov chaw tsim khoom txog qhov ntau ntawm HPMC siv thiab qhov kub xav tau rau kev yaj zoo.
3. Cov kuab tshuaj thiab kub
Qhov kev xaiv cov kuab tshuaj siv thiab qhov kub ntawm HPMC yaj yog cov yam tseem ceeb uas cuam tshuam rau cov txheej txheem yaj. Dej yog cov kuab tshuaj siv ntau tshaj plaws rau HPMC, thiab nws yog ib qho tseem ceeb kom ntseeg tau tias cov dej siv yog qhov zoo thiab tsis muaj cov khoom tsis huv. Cov dej tsis huv yuav muaj cov khoom tsis huv uas tuaj yeem cuam tshuam rau HPMC yaj thiab tag nrho cov khoom zoo.
Qhov kub uas HPMC yaj kuj tseem ceeb heev. HPMC yaj zoo tshaj plaws hauv dej sov, zoo dua ntawm 80-90 degrees Celsius. Txawm li cas los xij, nws yuav tsum nco ntsoov tias qhov kub yuav tsum tsis txhob siab dhau, txwv tsis pub HPMC yuav raug denatured thiab degraded, ua rau viscosity txo qis thiab kev ua haujlwm tsis zoo. Yog li ntawd, nws yog ib qho tseem ceeb kom ua tib zoo tswj qhov kub ntawm cov kuab tshuaj kom ntseeg tau tias muaj kev ua haujlwm zoo thiab sib xws.
4. Sib tov thiab do
Kev sib tov thiab kev sib xyaw yog qhov tseem ceeb heev kom ntseeg tau tias HPMC yaj tau zoo. Kev sib tov thiab kev sib xyaw kom huv si yuav pab rhuav tshem cov khoom me me ntawm HPMC thiab tsim cov tshuaj sib xyaw ua ke thiab sib xws. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum siv cov txheej txheem sib tov kom haum, xws li cov tshuab sib tov high-shear, uas pab ua kom muaj zog sib tov thiab kev ntxhov siab hauv cov tshuaj.
5. Kev sib xyaw ntawm HPMC kua
Qhov concentration ntawm HPMC hauv cov tshuaj yog ib qho tseem ceeb uas yuav tsum xav txog thaum yaj HPMC. Yog tias qhov concentration ntawm HPMC siab dhau, nws yuav ua rau muaj cov pob me me lossis cov khoom sib xyaw ua ke hauv cov tshuaj, ua rau nws nyuaj rau kom tau txais cov tshuaj sib xws. Ntawm qhov tod tes, yog tias qhov concentration qis dhau, nws yuav ua rau cov tshuaj uas dilute dhau thiab muaj kev ua haujlwm tsis zoo.
xaus lus
HPMC yog ib qho polymer uas siv tau ntau yam thiab siv tau ntau yam hauv kev lag luam xws li kev tsim kho, tshuaj thiab khoom noj. Kev yaj HPMC tuaj yeem yog ib qho txheej txheem nyuaj, thiab nws yog ib qho tseem ceeb uas yuav tsum xav txog cov yam xws li kev huv, qib, cov kuab tshuaj, qhov kub, kev sib tov, kev sib xyaw, thiab kev sib xyaw ntawm cov tshuaj HPMC. Kev yaj zoo thiab cov txiaj ntsig xav tau tuaj yeem ua tiav los ntawm kev ua raws li cov lus qhia ntawm cov chaw tsim khoom thiab tswj cov yam no kom zoo.
Lub sijhawm tshaj tawm: Cuaj hlis-22-2023