HydroxyPropyyl methylcellulose (HPMC) yog cov tshuaj polymer ntau ntxiv rau hauv kev lag luam xws li cov tshuaj, thiab kev tsim kho. Nws cov kev ua tau zoo sib txawv raws nws cov qhab nia, uas sib txawv hauv cov tsis xws li viscosity, degree ntawm qhov loj me, thiab huv si. To kev nkag siab tias cov qib pib cuam tshuam rau kev ua tau zoo yog qhov ua tau zoo rau nws siv hauv ntau yam kev siv.
1. Viscosity
Viscosity yog ib qho tseem ceeb heev uas cuam tshuam kev ua tau zoo ntawm HPMC hauv kev siv sib txawv. Nws yog feem ntau ntsuas hauv centipoises (CP) thiab tuaj yeem muaj los ntawm tsawg heev rau siab heev.
Kws Tshuaj: Hauv ntsiav tshuaj tsim qauv, qis-vepcosity HPMC (piv txwv li, 5-50 CP) feem ntau siv tau cov khoom nplaum uas tsis muaj kev cuam tshuam rau lub ntsiav tshuaj ua kom tsis tu ncua lub sijhawm. High-viscosity HPMC (piv txwv li, 1000-4000 daim CP), ntawm qhov tod tes, yog siv hauv kev tswj hwm-tso tawm. Qhov siab tshaj viscosity ua kom cov tshuaj tso tawm Yeeb tshuaj, li no kom tsis txhob muaj kev kho mob ua haujlwm.
Kev Tsim Kho: Hauv cov khoom noj kom zoo, nruab nrab rau high-viscosity HPMC (piv txwv li, 100-200,000 CP) yog siv los txhim kho dej tuav thiab ua haujlwm. Qib vaccosity muaj cov khoom khaws cia zoo dua thiab txhim kho cov nplaum thiab lub zog ntawm cov sib tov, ua rau lawv zoo tagnrho rau cov vile cov nplaum thiab cov khoom lag luam.
2. Qib ntawm kev hloov pauv
Cov qib degree hloov pauv (DS) hais txog pes tsawg pab pawg ntawm cov xov xwm hydroxyl ntawm lub cellulose molecule uas tau hloov pauv nrog methoxy lossis hydroxyprodropsyl pawg. Qhov kev hloov kho no ntawm solubility, gelation, thiab thermal khoom ntawm HPMC.
Solubility: Cov DS qhov ntau dua feem ntau ua rau dej solubility. Piv txwv li, HPMC nrog cov ntsiab lus metoxy siab dua tau yooj yim dua hauv cov dej txias, uas tau txais txiaj ntsig hauv cov tshuaj uas ncua sijhawm thiab cov kua roj uas yuav tsum muaj.
Thermal gelation: Cov DS tseem cuam tshuam rau kev kub ntxhov kub. HPMC nrog qib siab dua ntawm kev hloov pauv ntawm qhov chaw nyob qis dua, uas tau zoo nyob rau hauv cov ntawv thov zaub mov noj uas nws tuaj yeem siv los tsim cov gels ua kom sov. Hauv kev sib piv, qis dua DS HPMC yog siv hauv cov ntawv thov uas xav tau siab dua Thermal stability.
3. Paus taus loj
Kev faib tawm qhov loj me me cuam tshuam rau kev cais thiab cov yam ntxwv ntawm lub cev ntawm cov khoom kawg.
Kws Tshuaj Kho Mob: Me me particle loj HPMC tawg sai dua, ua rau nws haum rau cov yeeb yaj kiab sai. Hloov siab, qhov ntau thiab tsawg yog siv nyob rau hauv kev tswj-tso cov ntsiav tshuaj, qhov twg qeeb qeeb disecting yog qhov xav tau kom ntev siv tshuaj yeeb tshuaj.
Kev tsim kho: Nyob rau hauv daim ntawv thov kev tsim kho, finer hais ntawm HPMC txhim kho homogeneity thiab ruaj khov ntawm qhov sib tov. Qhov no yog qhov tseem ceeb rau kev ua kom muaj kev sib txawv raws li cov xim tha xim, pleev xim, thiab cov nplaum.
4. Purity
Purity HPMC, tshwj xeeb tshaj yog kev hais txog qhov muaj kuab paug xws li cov hlau hnyav thiab cov kuab tshuaj uas tseem ceeb, tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov khoom noj.
Kws Tshuaj thiab khoom noj: qib siab heev kawm qib HPMC yog qhov tseem ceeb kom tau raws li kev tswj hwm cov qauv thiab ua kom muaj kev nyab xeeb. Kev impurities tuaj yeem cuam tshuam rau cov polymer kev ua tau zoo thiab ua rau muaj kev pheej hmoo txaus. Cov Kws Tshuaj HPMC yuav tsum ua raws li txoj kev qhia nruj xws li cov lus hauv khw muag tshuaj tau (USP, EP) rau paug.
5. Daim Ntawv Thov Kev Ua Haujlwm Tshwj Xeeb
Cov Ntaub Ntawv Siv Khoom:
Kev kho thiab cov fillers: tsawg mus rau nruab nrab-viscos cov qib (5-100 cp) yog qhov uas nws tau txhim kho lub tshuab hluav taws xob muaj zog tsis muaj kev sib cais.
Kev Tso Tawm Tso Tawm: High-viscosity HPMC qib (1000-4000 CP) yog qhov zoo tagnrho rau kev tswj hwm-tso tawm. Lawv tsim cov nyom gel uas cov kev tso yeeb tshuaj.
Ophththalmic daws: ultra-siab-purity, qis-viscosity HPMC (hauv qab 5 CP) yog siv rau hauv cov tee qhov muag kom muab lubrication yam tsis muaj kev txob txob.
Kev Lag Luam Khoom Noj:
Thickeners thiab stabilizers: tsawg mus rau nruab nrab-viscosity HPMC qib (5-1000 CP) yog siv los ua cov khoom noj kom tuab thiab ua kom muaj zog. Lawv txhim kho kev ntxhib los mos thiab txee-lub neej ntawm cov kua txiv, hnav khaub ncaws, thiab bakery khoom.
Kev noj haus fiber ntau: HPMC nrog cov viscosity hiber ntau yog siv los ua cov zaub mov muaj fiber ntau hauv cov khoom noj muaj calorie tsawg, muab cov kev zom zaub mov.
Kev Lag Luam Kev Tsim Kho Kev Tsim Kho:
Cov khoom siv cement thiab gypsum raws: nruab nrab rau high-viscosity HPMC qib (100-200,000 CP Qhov no yog qhov tseem ceeb hauv kev siv xws li cov nplaum nplaum, cov khoom siv, thiab plaster.
Cov xim tsev thiab cov txheej txheem hpmc nrog cov xim viscosity uas tsim nyog thiab qhov loj me me txhim kho kev ntseeg, thiab kev ruaj ntseg ntawm cov xim ua tiav thiab lub neej ntev dua.
Cov qhab nia sib txawv ntawm HPMC muab ntau cov khoom muaj ntau yam uas tuaj yeem ua rau cov kev xav tau tshwj xeeb hauv kev lag luam. Qhov kev xaiv ntawm qib-raws li viscosity, degree ntawm kev hloov pauv, thiab huv si lub luag haujlwm tseem ceeb hauv kev ua tau zoo rau cov ntawv thov xav tau. Los ntawm kev nkag siab cov nuancents, cov chaw tsim khoom tuaj yeem xaiv tau cov txiaj ntsig HPMC uas tsim nyog, txawm tias nws yuav nyob hauv cov chaw ua tshuaj, txawm tias nws yog khoom noj khoom haus, lossis kev tsim kho. Qhov kev txiav txim siab no ua rau cov khoom ua tau zoo, kev nyab xeeb, thiab ua tau zoo, qhia txog HPMC hauv kev siv cov kev siv.
Lub Sijhawm Post: Lub Tsib Hlis-29-2024