Hais txog cov gel kub ntawm hydroxypropyl methyl celluloseHPMC, ntau cov neeg siv tsis tshua tau them sai sai rau cov gel kub ntawm hydroxypropyl methyl cellulose. Tam sim no hydroxypropyl cellulose feem ntau yog qhov txawv raws li nws viscosity, nws tsis txaus los tsuas yog muaj kev cuam tshuam ntawm cov khoom. Hauv qab no qhia luv luv qhia txog qhov kub ntawm hydroxypropyl methylulose.
Cov ntsiab lus ntawm methoxy pab pawg yog hais ncaj qha rau cov qib ntawm cellulose, thiab cov ntsiab lus ntawm metrlysss pawg tuaj yeem hloov kho cov mis, cov tshuaj tiv thaiv kub thiab cov kev ntsuas kub. Nyob rau tib lub sijhawm, cov qib ntawm carboxylation cuam tshuam rau cov degree ntawm hydroxyethyl lossis hydroxypropyl. Yog li ntawd, cov dej ua kom cov neeg muaj kev hais ua ke nrog kev kub siab gel kub feem ntau yog me ntsis zuj zus. Cov txheej txheem ntau lawm yuav tsum tau tshawb nrhiav, yog li nws tsis yog tias cov ntsiab lus ntawm cov pawg methoxy yog tsawg, cov nqi yuav qis, nws tus nqi yuav siab dua.
Cov pa taws kub yog txiav txim siab los ntawm cov pab pawg methoxy, thiab cov dej tuav tseg yog txiav txim los ntawm hydroxypropoxy pab pawg. Tsuas muaj peb pab pawg hloov chaw ntawm cellulose. Pom koj qhov kev siv ntsuas kub, kev txuag dej haum, thiab tom qab ntawd txiav txim siab tus qauv ntawm cov cellulose no.
Qhov kub thiab txias yog qhov tseem ceeb rau kev thov ntawmCellulose etherCov. Thaum lub teb chaws kub tshaj qhov kub thiab txias tshaj, lub cellulose ether yuav cais los ntawm dej thiab poob dej cia. Qhov kub ntawm cellulose ether rau ntawm kev ua lag luam yuav tau raws li cov kev xav tau ntawm cov tshuaj khib uas siv (tshwj tsis yog rau cov chaw tshwj xeeb). Cov neeg tsim khoom yuav tsum siv qhov no mus rau kev txiav txim siab.
Lub sijhawm Post: Plaub-26-2024