HydroxyPropyyl methylulose (HPMC) yog ib qho tseem ceeb tshaj ether derivative uas tau siv dav hauv ntau lub cev thiab tshuaj siv tshuaj lom neeg. Nws cov qauv viscososity yog ib qho ntawm cov khoom tseem ceeb tshaj plaws ntawm HPMC, cuam tshuam nrog nws cov kev ua tau zoo hauv ntau yam kev siv.
1. Cov khoom yooj yim ntawm HPMC
HPMC yog cov neeg tsis muaj ntaub ntawv ntawm cov neeg siv hluav taws xob ether tau los ntawm kev hloov ib feem ntawm cov pab pawg hydroxule nrog cov pawg metholule (-och3) thiab hydroxypropyl pawg (-och2CH (Oh) CH3). Nws muaj solubility hauv dej thiab qee cov kuab tshuaj organic, ua cov kev daws teeb meem pob tshab coloidal. Lub viscos tuaj ntawm HPMC feem ntau yog txiav txim siab los ntawm nws txoj kev ua molecular, qib ntawm hloov chaw (DS
2. Kev txiav txim siab ntawm viscosity ntawm HPMC
Lub viscos huab cua ntawm HPMC cov kev daws teeb meem feem ntau yog ntsuas siv cov volicometer sib hloov lossis tus vislive captary. Thaum ntsuas kev ntsuas, xav tau yuav tsum tau them rau cov kev xav, kub thiab shear tus nqi ntawm cov kev daws, raws li cov kev daws teeb meem no tuaj yeem cuam tshuam ntau rau cov nqi viscosity.
Kev daws teeb meem: lub viscos ntawm HPMC nce nrog kev nce kev daws teeb meem. Thaum cov kev hloov pauv ntawm HPMC qis dua, kev sib cuam tshuam ntawm cov lwg me me yog qhov tsis muaj zog thiab cov viscosity yog qis dua. Raws li kev xav tau nce, qhov kev sib cuam tshuam thiab kev sib cuam tshuam ntawm cov lwg me me nce, ua rau muaj txiaj ntsig zoo hauv viscosity.
Qhov kub thiab txias: Lub viscosity ntawm HPMC cov kev daws teeb meem yog qhov sib cav heev. Feem ntau, raws li qhov kub nce ntxiv, lub viscosity ntawm HPMC kev daws yuav tsawg. Qhov no yog vim muaj kev kub ntxhov ntau ntxiv rau cov suab paj nruag nce ntxiv thiab kev sib txuas lus tsis muaj zog. Nws yuav tsum raug sau tseg tias HPMC nrog cov qib sib txawv ntawm qhov hloov chaw thiab hnyav hnyav muaj qhov sib txawv sib txawv.
Shear Tus Nqi: HPMC cov kev daws teeb meem Pseudoplastic (shear phinning) tus cwj pwm yog siab dua ntawm cov nqi qis qis thiab txo qis tshee tus nqi. Tus cwj pwm no vim yog shear rog uas ua kom muaj cov hlua khi ua ke raws cov kev taw qhia shear, yog li txo cov entangllements thiab kev cuam tshuam ntawm cov lwg me me.
3. Qhov xwm txheej cuam tshuam HPMC viscosity
Molecular qhov hnyav: qhov hnyav molecular ntawm HPMC yog ib qho tseem ceeb ntawm qhov tseem ceeb uas txiav txim siab txog nws viscosity. Feem ntau hais lus, qhov hnyav dua cov molecular hnyav, ntau dua cov viscosity ntawm kev daws. Qhov no yog vim HPMC lwg me me nrog lub cev muaj zog siab tshaj qhov uas yuav tsum tau ua cov koom tes, yog li nce kev sib txhuam ntawm txoj kev daws teeb meem.
Degree ntawm hloov chaw thiab xa khoom xa tuaj: tus lej thiab faib tawm methoxy thiab hydroxypropyl chaw nyob hauv HPMC kuj cuam tshuam rau nws viscosity. Feem ntau, qib siab dua ntawm methoxy hloov (DS), qis dua ntawm cov methoxy hloov chaw yuav txo cov hydrogen kev quab yuam ntawm cov lwg me. Kev qhia txog ntawm hydroxypropyl chaw yuav nce cov kev sib txuam, yog li muaj visccosity. Tsis tas li ntawd, cov khoom siv tsis sib raug zoo ntawm cov neeg hloov pauv yuav pab tsim cov kev daws teeb meem ruaj khov thiab nce viscosity ntawm kev daws teeb meem.
PH HPMC, yog li cuam tshuam lub viscosity.
4. Daim ntawv thov ntawm HPMC
Vim nws zoo nkauj viscosity cov yam ntxwv, hpmc tau dav siv nyob rau hauv ntau thaj teb:
Cov ntaub ntawv tsim tsev: hauv cov ntaub ntawv tsim vaj tsev, HPMC yog siv los ua cov tuab thiab dej tuav cov neeg sawv cev kom txhim kho kev ua haujlwm thiab nce tawg.
Kws Tshuaj Kho Mob: Hauv kev lag luam hauv lub tsev kws tshuaj, HPMC yog siv los ua cov ntawv, yog tus neeg sawv cev ua yeeb yaj kiab rau tsiav tshuaj thiab cov cab kuj rau cov tshuaj tsis txaus siab.
Kev Lag Luam Khoom Noj Khoom Noj: HPMC yog siv los ua cov tuab thiab muaj stabilizer nyob rau hauv kev lag luam khoom noj rau kev tsim cov khoom noj, jelly thiab cov khoom noj siv mis.
Cov khoom lag luam txhua hnub: hauv cov khoom siv tshuaj lom txhua hnub, HPMC yog siv los ua cov tshuaj zawv zawv plaub hau, da dej gel, tshuaj txhuam hniav, thiab lwm yam.
Tus yam ntxwv viscosity ntawm HPMC yog lub hauv paus rau nws cov kev ua tau zoo hauv ntau yam kev siv. Los ntawm kev tswj cov roj molecular, qib ntawm kev daws teeb meem ntawm HPMC, nws viscosity tuaj yeem hloov kho kom tau raws li cov kev xav tau sib txawv. Nyob rau hauv lub neej yav tom ntej, hauv-tob kev tshawb fawb txog kev sib txheeb ntawm HPMC molecular qauv thiab viscosity yuav pab txhim kho HPMC cov khoom lag luam nrog kev ua tau zoo dua thiab nthuav dav nws cov ntawv thov.
Lub Sijhawm Post: Jul-20-2024