HPMC (Hydroxypropyl methylcellulose)thiabCMC (carboxymethyl cellulose)Feem ntau siv cov thickeners thiab colloids hauv textile, kws, khoom noj khoom haus thiab tshuaj pleev ib ce industries. Lawv cov yam ntxwv tawg nyob rau hauv cov xwm txheej sib txawv muaj qhov cuam tshuam tseem ceeb rau lawv cov ntawv thov.
1. Dissolution yam ntxwv ntawm HPMC
HPMC yog cellulose derivative nrog dej solubility zoo thiab thermal stability. Nws cov kev sib cais yog ze ze rau nws cov qauv molecular, qhov hnyav ntawm molecular, thiab qib ntawm kev hloov ntawm hydroxypropyl thiab methyl pawg.
1.1 Dissolution Kub
Qhov kub dissolution ntawm HPMC yog qhov qis, thiab feem ntau nws tuaj yeem yaj zoo hauv qab 60 ° C. Vim tias nws cov molecules muaj hydrophilic hydroxypropyl thiab methyl pawg, lawv tuaj yeem tsim hydrogen bonds nrog cov dej molecules, yog li txo qhov kub ntawm qhov xav tau rau kev sib cais. Rau siab molecular hnyav HPMC, qhov kub dissolution yuav nce me ntsis, tab sis feem ntau nws tseem tuaj yeem yaj tag ntawm chav tsev kub lossis kub dua me ntsis.
1.2 Lub Sijhawm Dissolution
Lub sijhawm tawg ntawm HPMC feem ntau luv, tshwj xeeb tshaj yog thaum cov dej kub nruab nrab. Yuav kom tsis txhob agglomeration thaum lub sij hawm dissolution txheej txheem, nws yog feem ntau pom zoo kom ntxiv HPMC rau cov dej rau dispersion ua ntej cua sov thiab nplawm, uas yuav pab tau kom lub dissolution efficiency. High-concentration daws yuav siv sij hawm ntev dua kom yaj tag.
1.3 Solubility thiab pH tus nqi
Lub solubility ntawm HPMC tsis tshua cuam tshuam los ntawm pH tus nqi thiab tuaj yeem yaj nyob rau hauv ntau qhov pH. Feem ntau hais lus, HPMC muaj zoo solubility nyob rau hauv acidic, nruab nrab thiab me ntsis alkaline tej yam kev mob, yog li tsis tas yuav xav txog kev hloov pH nyob rau hauv feem ntau cov ntawv thov.
2. Dissolution yam ntxwv ntawm CMC
CMC yog cov dej-soluble polymer tau los ntawm kev hloov kho tshuaj ntawm cellulose thiab yog siv dav hauv cov khoom noj, tshuaj thiab kev lag luam. Cov yam ntxwv tawg ntawm CMC yog qhov txawv me ntsis ntawm HPMC.
2.1 Dissolution kub
Qhov kub dissolution ntawm CMC yog siab dua li ntawm HPMC, thiab feem ntau yuav tsum muaj dej kub kom yaj tag. Kev tawg ntawm CMC feem ntau yuav tsum tau ua kom sov cov dej kom siab tshaj 60 ° C, tshwj xeeb tshaj yog rau cov viscosity siab ntau yam, qhov kub thiab qhov sib tov yog qeeb qeeb. Yog tias cov dej kub qis dhau lawm, qhov kev sib cais ntawm CMC yuav qeeb heev, uas yuav ua rau cov tshuaj agglomerate.
2.2 Lub sijhawm tawg
Lub sij hawm tawg ntawm CMC feem ntau yog ntev, tshwj xeeb tshaj yog nyob rau hauv high concentrations, lub sij hawm dissolution yuav siv sij hawm ob peb teev. Txhawm rau txhim kho qhov kev ua tau zoo ntawm CMC, nws feem ntau pom zoo kom ntub nws hauv dej txias thiab tom qab ntawd kub thiab do. Tsis tas li ntawd, CMC feem ntau yuav clump thaum lub sij hawm dissolution txheej txheem, yog li nws yuav tsum tau tag nrho stirred kom nws yaj tusyees.
2.3 Solubility thiab pH tus nqi
CMC rhiab heev rau kev hloov pauv hauv pH. Nyob rau hauv qis pH tej yam kev mob (acidic ib puag ncig), CMC muaj zoo solubility, thaum nyob rau hauv high pH tej yam kev mob (alkaline ib puag ncig), nws solubility yuav txo thiab tsis tiav dissolution yuav tshwm sim. Yog li ntawd, hauv kev siv tiag tiag, tus nqi pH ntawm CMC cov tshuaj yuav tsum tau tswj nyob rau hauv ib qho kev tsim nyog, thiab nws feem ntau pom zoo kom nyob nruab nrab ntawm pH 4-8. Yog tias tus nqi pH siab dhau lawm, kev solubility ntawm CMC yuav raug cuam tshuam.
3. Kev sib piv ntawm kev sib cais ntawm HPMC thiab CMC
Los ntawm kev xav ntawm cov yam ntxwv ntawm kev sib cais, HPMC thiab CMC muaj qhov sib txawv tseem ceeb hauv qab no hauv kev sib cais:
Cov khoom sib piv
Dissolution kub HPMC tuaj yeem yaj ntawm qhov kub thiab txias, feem ntau qis dua 60 ° C
CMC xav tau dej kub dua, feem ntau yog siab dua 60 ° C
Lub sij hawm dissolution HPMC muaj lub sij hawm dissolution luv dua thiab dissolves sai sai tom qab dispersion
CMC muaj lub sijhawm tawg ntev dua thiab xav tau kom txaus stirring
pH rhiab heev HPMC muaj me ntsis cuam tshuam rau pH hloov thiab muaj zog adaptability
CMC muaj pH hloov loj thiab muaj cov kua qaub solubility zoo
agglomeration teeb meem HPMC tsis yooj yim rau agglomerate thiab dissolves ntau tusyees
CMC yog ib qho yooj yim rau agglomerate thiab xav kom txaus stirring
Qhov sib txawv ntawm kev sib cais ntawm cov xwm txheejHPMCthiabCMCFeem ntau yog tshwm sim nyob rau hauv lub dissolution kub, dissolution lub sij hawm, pH adaptability thiab agglomeration teeb meem. HPMC dissolves kuj sai thiab muaj qhov xav tau ntawm qhov kub thiab txias, ua rau nws haum rau siv nyob rau hauv chav tsev kub los yog kub dua me ntsis, thaum CMC yuav tsum tau kub dua thiab lub sij hawm ntev dua kom yaj tag, thiab yog rhiab heev rau pH hloov. Hauv kev siv tswv yim, xaiv cov khoom tsim nyog thiab kev sib cais raws li kev xav tau sib txawv yuav pab txhim kho kev tsim khoom thiab cov khoom zoo.
Rau cov ntawv thov uas xav tau kev sib cais sai thiab tsis nkag siab rau pH, HPMC yog qhov kev xaiv zoo dua. Rau cov kev daws teeb meem uas yuav tsum tau ruaj khov nyob rau hauv ib qho pH ntau yam, CMC tej zaum yuav tsim nyog dua. Hauv cov ntawv thov tshwj xeeb, nws yog ib qho tseem ceeb heev uas yuav tsum xav txog qhov kev hloov pauv ntawm kev sib cais thiab cov khoom tsim nyog.
Post lub sij hawm: Jan-16-2025