Hydroxypropyl methylcellulose (HPMC)yog ib qho cellulose ether nonionic siv dav hauv kev tsim kho, tshuaj, khoom noj, tshuaj pleev ib ce thiab lwm yam teb. Nws yog ua los ntawm cov polymer cellulose ntuj los ntawm kev qhia txog methoxy (–OCH₃) thiab hydroxypropoxy (–OCH₂CH(OH)CH₃) cov pab pawg ua haujlwm los ntawm kev sib xyaw ua ke. Vim muaj ntau hom kev hloov pauv, qib kev hloov pauv (DS, methoxy degree of substitution; MS, hydroxypropoxy degree of substitution) thiab qib polymerization, HPMC tuaj yeem faib ua ntau hom kom tau raws li cov kev xav tau ntawm ntau daim ntawv thov.
1. Sib txawv los ntawm methoxy thiab hydroxypropoxy degree ntawm kev hloov pauv
Qhov degree ntawm methoxy thiab hydroxypropoxy ntawm kev hloov pauv ntawm HPMC cuam tshuam ncaj qha rau nws cov solubility, thermal gelation thiab kev ua haujlwm ntawm qhov chaw.
Hom HPMC methoxy siab: Qib methoxy ntawm kev hloov pauv siab, cov tshuaj muaj zog thermal gelation, thiab tsim cov gel ruaj khov nyob rau hauv qhov kub siab. Nws yog qhov tsim nyog rau cov ntaub ntawv tsim kho uas xav tau kev khaws cia dej, thickening thiab kev sib txuas, xws li cov nplaum pobzeb, hmoov putty, thiab cov tshuaj pleev thaiv phab ntsa sab nraud.
Nruab nrab methoxy-medium hydroxypropoxy HPMC: sib npaug solubility thiab gelation, feem ntau siv rau hauv kev tswj hwm tshuaj tso tawm, zaub mov thickening, thiab lwm yam.
HPMC qis methoxy-high hydroxypropoxy: kub thermal gelation siab, pob tshab zoo, viscosity ruaj khov, haum rau cov tshuaj pleev ib ce, tshuaj qhov muag thiab lwm yam kev siv uas xav tau pob tshab siab thiab tsis khaus.
2. Kev faib tawm los ntawm qib viscosity
HPMC feem ntau yog qhia txog qhov viscosity ntawm 2% aqueous kua, xws li ob peb mPa · s txog 200,000 mPa · s.
Cov viscosity qis (3–100 mPa·s): zoo fluidity, feem ntau yog siv rau hauv cov ntawv thov uas xav tau kev yaj sai thiab nkag mus, xws li cov tshuaj pleev ib ce, tshuaj tsuag thiab emulsion stabilizers.
Qhov nruab nrab viscosity (100–10,000 mPa·s): siv rau hauv kev tsim kho mortar thiab gypsum cov khoom, xav txog ob qho tib si kev khaws dej thiab cov khoom siv hauv kev tsim kho.
Muaj viscosity siab (10,000–200,000 mPa·s): muaj peev xwm khaws dej tau zoo thiab ua kom tuab, feem ntau siv rau hauv cov nplaum rau pobzeb, cov khoom nplaum, cov tshuaj siv niaj hnub thiab cov khoom noj uas ua kom tuab.
3. Kev faib tawm los ntawm cov yam ntxwv solubility thiab cov hom ion
HPMC yog cov cellulose ether uas tsis yog ionic nrog kev yaj dej zoo thiab ruaj khov rau electrolytes. Qee cov khoom tau hloov kho kom haum rau cov ntawv thov tshwj xeeb:
HPMC yaj tau sai: Tom qab kev kho saum npoo, nws tuaj yeem tawg sai sai hauv dej txias los ua cov tshuaj sib xws, uas tsim nyog rau kev npaj sai ntawm cov mortar lossis txheej.
HPMC yaj qeeb: Qhov nrawm yaj qeeb, tsim nyog rau kev zam kev sib sau ua ke hauv qhov chaw kub siab, thiab feem ntau siv rau kev sib tov ntau ntawm cov chaw tsim kho.
4. Kev faib tawm los ntawm kev hloov kho kev ua haujlwm
Raws li qhov xav tau ntawm lub davhlau ya nyob twg, HPMC tuaj yeem hloov kho tau ntau txoj hauv kev ua haujlwm:
HPMC uas tiv taus enzyme: Nws muaj kev ruaj khov zoo dua hauv cov chaw muaj kab mob me me thiab siv rau cov khoom noj tshwj xeeb thiab cov khoom siv biomaterials.
HPMC uas tiv taus kub siab: Nws tswj tau qhov kub thiab txias gelation siab kom txhim kho kev nplaum thiab kev khaws dej thaum lub sijhawm tsim kho kub siab.
HPMC uas muaj surfactant ntxiv rau: Txhim kho kev ruaj khov ntawm emulsion thiab cov khoom ntub dej, siv rau hauv cov xim pleev xim thiab cov tshuaj pleev xim latex.
5. Cov hom kev hloov kho raws li daim teb thov
Qib architectural HPMC: Ua kom pom tseeb txog kev khaws dej, kev ua haujlwm ntawm kev tsim kho, tiv thaiv kev plam thiab kev nplaum, siv rau hauv cov nplaum pobzeb, putties, gypsum, thiab cov tshuaj rwb thaiv tsev thermal.
Qib tshuaj HPMC: Ua tau raws li cov qauv pharmacopoeia, siv rau hauv cov tshuaj pleev xim rau ntsiav tshuaj, cov neeg nqa khoom uas tso tawm tas mus li, thiab cov tshuaj pleev qhov muag uas ua rau tuab.
Khoom noj khoom haus qib HPMC: Siv ua cov khoom ua kom tuab, emulsifier, thiab hloov rog, siv dav hauv cov khoom ci thiab cov khoom noj mis nyuj.
Qib tshuaj pleev ib ce HPMC: Pob tshab siab, tsis khaus, siv rau hauv cov tshuaj zawv plaub hau, tshuaj pleev, thiab cov ntaub npog ntsej muag.
Hom HPMC yog txiav txim siab los ntawm qib ntawm methoxy thiab hydroxypropoxy hloov chaw, qib ntawm polymerization, thiab kev hloov kho tom qab. Cov hom sib txawv muaj lawv tus kheej qhov zoo hauv viscosity, thermal gelation kub, dej khaws cia, dissolving rate, thiab daim ntawv thov scenarios. Xaiv hom zoo ntawmHPMC yuav tsum xav txog cov kev cai thov tshwj xeeb, xws li qhov yuav tsum tau ua ntawm cov ntaub ntawv siv rau kev khaws dej thiab cov khoom siv hauv kev tsim kho, qhov yuav tsum tau ua ntawm cov tshuaj rau kev nyab xeeb thiab cov khoom yaj, thiab qhov yuav tsum tau ua ntawm cov khoom noj thiab cov tshuaj txhua hnub rau kev pom tseeb thiab saj.
Lub sijhawm tshaj tawm: Lub Xya Hli-23-2025