Qhov ntau dua viscosity ntawmHPMCHydroxyPropyyl methyl cellulose, qhov zoo dua cov dej khaws cia. Viscosity yog qhov tseem ceeb parameter ntawm HPMC kev ua tau zoo. Tam sim no, sib txawv HPMC cov tuam txhab siv cov qauv sib txawv thiab cov cuab yeej los txiav txim qhov viscosity ntawm HPMC. Cov ntsiab lus tseem ceeb yog Haake Rotovisko, Hoppller, Ubbelohde thiab Brookfield, thiab lwm yam.
Rau tib cov khoom lag luam, cov txiaj ntsig ntawm viscosity ntsuas los ntawm cov qauv sib txawv yog qhov sib txawv heev, qee qhov muaj ntau qhov sib txawv. Yog li ntawd, thaum piv cov viscosity, nws yuav tsum tau nqa tawm ntawm tib txoj kev xeem, suav nrog qhov kub thiab lwm yam.
Rau qhov loj me me, lub flexer rau particle, qhov zoo dua cov dej khaws cia. Cov khoom loj ntawm cellulose ether chwv nrog dej, qee zaum ntev rhuav tshem cov khoom noj kom tiv thaiv kom tsis txhob muaj kev nkag mus, kev tsim cov av nkos flocculent daws los yog Agglomerate. Lub solubility ntawm cellulose ether yog ib qho ntawm qhov los xaiv cellulose ether. Fineness tseem yog ib qho kev ua tau tseem ceeb ntsuas ntawm methyl cellulose ether. Mc rau c tov duab qhuav yuav tsum hmoov, cov ntsiab lus dej qis, thiab kev ua kom zoo ntawm 20% ~ 60% particle loj dua 63um. Kev lom zem cuam tshuam rau solubility ntawmHPMCHydroxyPropyyl methyl cellulose ether. MEEB MC feem ntau yog granular thiab tuaj yeem yooj yim yaj nyob rau hauv dej yam tsis muaj agglomerating, tab sis kev sib zog sib zog yog qeeb heev, yog li nws tsis haum rau siv hauv cov tshuaj khib. Hauv cov cug qhuav, MC tau tawg ntawm kev sib sau ua ke, cov khoom siv nplua thiab hmoov ntsuab zoo txaus kom tsis txhob muaj kev sib xyaw ntawm methyl cellulose ether thaum sib tov nrog dej. Thaum MC ntxiv dej kom yaj agglomerate, nws yog qhov nyuaj rau kev ntiab tawm thiab yaj nws. MC nrog cov ntxhib zoo tsis yog tsuas yog khib nyiab xwb, tab sis kuj tseem txo lub zog ntawm lub zog cug. Thaum xws li cug cug qhuav no tsim nyob rau hauv ib thaj chaw loj, kev kho kom huv ntawm cug collect tau txo qis, ua rau tawg los ntawm kev kho lub sijhawm sib txawv. Rau cov neeg kho tshuab txau kab cug, vim yog lub sijhawm luv luv, lub txiaj ntsig yog siab dua.
Feem ntau hais lus, ntau dua cov viscosity, qhov zoo dua cov dej khaws cov nyhuv khaws cia. Txawm li cas los xij, qhov siab tshaj plaws viscosity yog, ntau dua cov molecular hnyav ntawm MC yog, thiab kev sib cav tsis zoo rau lub zog thiab kev tsim kho kev tshuaj khib. Qhov siab tshaj lub viscosity, ntau pom ntau dua cov thickening cov txiaj ntsig ntawm cug, tab sis nws tsis yog ib feem ntawm kev sib raug zoo. Lub volcosity, lub txiv ntoo ntub yuav muab cov nplaum ntau ntxiv, ob qho tib si kev tsim kho, kev ua tau zoo ntawm cov ntawv nplaum thiab cov khoom zoo rau cov khoom siv hauv paus. Tab sis nws tsis muaj txiaj ntsig zoo kom nce cov txheej txheem lub zog ntawm cov tshuaj khib ntub. Thaum kev tsim kho, kev ua haujlwm tsis zoo yog tsis pom tseeb. Ntawm qhov tsis sib xws, qee qhov viscosity qis tab sis hloov kho metyl cellulose cov neeg muaj kev paub zoo hauv kev txhim kho lub zog ntawm cov tshuaj cug ntub.
Lub cellule ntau ether yog ntxiv rau lub cap, kev ua kom zoo dua dej, ntau dua cov viscosity, txoj kev ua kom zoo dua dej.
HPMC fineness tseem muaj qee yam cuam tshuam rau nws cov dej khaws cia, feem ntau hais lus etle, nyob rau hauv cov neeg visculos thiab ntau yam ntawm cov nyhuv siv nyiaj rov qab zoo dua.
Cov dej khaws cia ntawm HPMC kuj tseem muaj feem xyuam rau qhov kub ntawm kev siv, thiab cov dej tuav tseg ntawm methyl cellulose muaj kev nce siab nrog qhov kub nce siab. Tab sis nyob rau hauv daim ntawv thov cov khoom siv tiag tiag, muaj ntau cov chaw ntawm cov cua cug ntau zaus yuav muaj 40 degrees ntawm phab ntsa sab nrauv plastering, uas feem ntau nrawm nrawm ntawm cement thiab cug tov cug ua kom tawv tawv thiab qhuav. Qhov txo qis ntawm dej tswj tuav mus rau qhov pom tseeb uas ob leeg ua kom muaj kev cuam tshuam tau cuam tshuam. Hauv cov xwm txheej no, txo cov cawv ntawm qhov ntsuas kub ua rau tshwj xeeb. Txawm hais tias ntxiv ntawm methyl hydroylyd cellulose cellulose cellulose, nws cov kev vam khom rau qhov muaj zog ntawm cov khoom siv tsis muaj zog. Txawm hais tias muaj nce ntawm methyl hydroylelethyl cellulose cellulose cellulose cellulose noj (lub caij ntuj sov formula), kev tsim kho thiab tawg tsis tau ntawm kev siv. Los ntawm qee qhov kev kho mob tshwj xeeb ntawm MC, xws li nce qib kev ua haujlwm ntawm MC tuaj yeem ua kom muaj kev cuam tshuam zoo nyob rau hauv cov kev mob siab, yog li nws tuaj yeem muab kev ua tau zoo hauv qab.
Lub Sijhawm Post: Lub Tsib Hlis-18-2022