HPMC (hydroxypropyl methylcellulose)thiabCMC (carboxymethyl cellulose)yog cov khoom ua kom tuab thiab cov colloids uas feem ntau siv hauv kev lag luam textile, tshuaj, khoom noj thiab kev lag luam pleev kom zoo nkauj. Lawv cov yam ntxwv yaj hauv qab ntau yam mob muaj feem cuam tshuam tseem ceeb rau lawv daim ntawv thov.
1. Cov yam ntxwv ntawm HPMC yaj
HPMC yog ib qho cellulose derivative uas muaj dej solubility zoo thiab thermal stability. Nws cov xwm txheej yaj yog ze rau nws cov qauv molecular, qhov hnyav molecular, thiab qib kev hloov pauv ntawm hydroxypropyl thiab methyl pawg.
1.1 Kub yaj
Qhov kub yaj ntawm HPMC yog qhov qis heev, 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 cov hydrogen bonds nrog cov dej molecules, yog li txo qhov kub uas xav tau rau kev yaj. Rau cov molecular hnyav HPMC siab, qhov kub yaj yuav nce me ntsis, tab sis feem ntau nws tseem tuaj yeem yaj tag nrho ntawm chav tsev kub lossis kub dua me ntsis.
1.2 Lub Sijhawm Yaj
Lub sijhawm yaj ntawm HPMC feem ntau luv, tshwj xeeb tshaj yog thaum qhov kub ntawm dej nruab nrab. Yuav kom tsis txhob muaj kev sib sau ua ke thaum lub sijhawm yaj, feem ntau pom zoo kom ntxiv HPMC rau hauv dej rau kev yaj ua ntej ua kom sov thiab do, uas pab txhim kho kev ua haujlwm yaj. Cov tshuaj muaj zog ntau yuav siv sijhawm ntev dua kom yaj tag.
1.3 Kev yaj thiab tus nqi pH
Qhov solubility ntawm HPMC tsis cuam tshuam los ntawm pH tus nqi thiab tuaj yeem yaj rau hauv ntau pH. Feem ntau hais lus, HPMC muaj solubility zoo nyob rau hauv acidic, nruab nrab thiab me ntsis alkaline mob, yog li tsis tas yuav xav txog kev hloov pH hauv feem ntau ntawm cov ntawv thov kev lag luam.
2. Cov yam ntxwv ntawm kev yaj ntawm CMC
CMC yog ib qho polymer uas yaj tau hauv dej los ntawm kev hloov kho tshuaj ntawm cellulose thiab siv dav hauv cov khoom noj, tshuaj thiab kev lag luam. Cov yam ntxwv ntawm kev yaj ntawm CMC txawv me ntsis ntawm HPMC.
2.1 Qhov kub ntawm kev yaj
Qhov kub ntawm CMC yaj siab dua li HPMC, thiab feem ntau xav tau qhov kub ntawm dej siab dua kom yaj tag. Kev yaj ntawm CMC feem ntau xav tau cua sov dej kom siab dua 60 ° C, tshwj xeeb tshaj yog rau cov hom viscosity siab, qhov kub thiab qhov ceev ntawm kev yaj qeeb dua. Yog tias qhov kub ntawm dej qis dhau, qhov ceev ntawm kev yaj ntawm CMC yuav qeeb heev, uas yuav ua rau cov tshuaj sib sau ua ke.
2.2 Lub sijhawm yaj
Lub sijhawm yaj ntawm CMC feem ntau ntev, tshwj xeeb tshaj yog thaum muaj cov tshuaj ntau, lub sijhawm yaj yuav siv sijhawm ntau teev. Yuav kom txhim kho qhov ua tau zoo ntawm CMC, feem ntau pom zoo kom ua ntej ntub nws hauv dej txias thiab tom qab ntawd ua kom sov thiab do nws. Tsis tas li ntawd, CMC yuav lo ua ke thaum lub sijhawm yaj, yog li nws yuav tsum tau do kom tag nrho kom nws yaj sib npaug.
2.3 Kev yaj thiab tus nqi pH
CMC rhiab heev rau kev hloov pauv ntawm pH. Hauv qab pH qis (qhov chaw acidic), CMC muaj kev yaj zoo, thaum nyob rau hauv cov xwm txheej pH siab (qhov chaw alkaline), nws cov kev yaj yuav txo qis thiab kev yaj tsis tiav yuav tshwm sim. Yog li ntawd, thaum siv tiag tiag, tus nqi pH ntawm CMC kua yuav tsum tau tswj hwm hauv qhov ntau thiab tsawg, thiab feem ntau pom zoo kom nyob nruab nrab ntawm pH 4-8. Yog tias tus nqi pH siab dhau, kev yaj ntawm CMC yuav raug cuam tshuam.
3. Kev sib piv ntawm cov xwm txheej yaj ntawm HPMC thiab CMC
Los ntawm qhov kev xav ntawm cov yam ntxwv ntawm kev yaj, HPMC thiab CMC muaj cov qhov sib txawv tseem ceeb hauv cov xwm txheej yaj:
Cov khoom sib piv
Kub yaj HPMC tuaj yeem yaj ntawm qhov kub qis, feem ntau qis dua 60 ° C
CMC xav tau dej kub dua, feem ntau siab dua 60 ° C
Lub sijhawm yaj HPMC muaj lub sijhawm yaj luv dua thiab yaj sai tom qab yaj
CMC muaj lub sijhawm yaj ntev dua thiab xav tau kev nplawm txaus
pH rhiab heev HPMC muaj qhov cuam tshuam me ntsis rau kev hloov pauv pH thiab muaj kev hloov pauv tau zoo
CMC muaj kev hloov pauv pH loj thiab muaj cov kua qaub zoo solubility
Qhov teeb meem agglomeration HPMC tsis yooj yim rau agglomerate thiab yaj ntau dua
CMC yooj yim rau agglomerate thiab xav tau kev nplawm txaus
Qhov sib txawv ntawm cov xwm txheej kev yaj ntawmHPMCthiabCMCfeem ntau pom tseeb hauv qhov kub thiab txias uas yaj, lub sijhawm yaj, kev hloov pauv pH thiab teeb meem sib sau ua ke. HPMC yaj sai sai thiab muaj qhov xav tau kub qis dua, ua rau nws tsim nyog siv rau ntawm qhov kub thiab txias hauv chav lossis qhov kub siab dua me ntsis, thaum CMC xav tau qhov kub siab dua thiab lub sijhawm ntev dua kom yaj tag, thiab muaj kev cuam tshuam ntau dua rau kev hloov pauv pH. Hauv kev siv ua haujlwm, kev xaiv cov ntaub ntawv tsim nyog thiab cov xwm txheej yaj raws li qhov xav tau sib txawv yuav pab txhim kho kev ua haujlwm zoo thiab cov khoom zoo.
Rau cov ntawv thov uas xav tau kev yaj sai thiab tsis rhiab rau pH, HPMC yog qhov kev xaiv zoo dua. Rau cov kev daws teeb meem uas yuav tsum tau ruaj khov hauv ib qho pH tshwj xeeb, CMC 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 cov xwm txheej yaj thiab cov khoom tsim nyog.
Lub sijhawm tshaj tawm: Lub Ib Hlis-16-2025