Hais txog qhov kub ntawm gel ntawm hydroxypropyl methyl celluloseHPMC, ntau tus neeg siv tsis tshua them sai sai rau qhov kub ntawm hydroxypropyl methyl cellulose. Tam sim no hydroxypropyl methyl cellulose feem ntau yog qhov sib txawv raws li nws cov viscosity, tab sis rau Qee qhov chaw tshwj xeeb thiab kev lag luam tshwj xeeb, nws tsis txaus los tsuas yog cuam tshuam qhov viscosity ntawm cov khoom. Cov hauv qab no luv luv qhia txog qhov kub ntawm hydroxypropyl methylcellulose.
Cov ntsiab lus ntawm cov pab pawg methoxy muaj feem cuam tshuam ncaj qha rau qib ntawm kev ntxuav cellulose, thiab cov ntsiab lus ntawm cov pab pawg methoxy tuaj yeem hloov kho los ntawm kev tswj cov mis, qhov kub thiab lub sijhawm ua haujlwm. Tib lub sijhawm, qib ntawm carboxylation cuam tshuam rau qib ntawm kev hloov pauv ntawm hydroxyethyl lossis hydroxypropyl. Yog li ntawd, kev khaws dej ntawm cellulose ethers nrog qhov kub gel siab feem ntau yog qhov phem dua me ntsis. Cov txheej txheem tsim khoom no yuav tsum tau tshawb nrhiav, yog li nws tsis yog tias cov ntsiab lus ntawm pab pawg methoxy qis, tus nqi tsim khoom ntawm cellulose ether qis, ntawm qhov tsis sib xws, nws tus nqi yuav siab dua.
Qhov kub ntawm cov gel yog txiav txim los ntawm pawg methoxy, thiab qhov khaws dej yog txiav txim los ntawm pawg hydroxypropoxy. Tsuas muaj peb pawg hloov tau ntawm cellulose. Nrhiav koj qhov kub siv tsim nyog, qhov khaws dej tsim nyog, thiab tom qab ntawd txiav txim siab tus qauv ntawm cov cellulose no.
Qhov kub ntawm cov gel yog qhov tseem ceeb rau kev sivcellulose etherThaum qhov kub thiab txias ntawm ib puag ncig tshaj qhov kub ntawm gel, cov cellulose ether yuav sib cais ntawm dej thiab poob qhov khaws cia dej. Qhov kub ntawm gel ntawm cellulose ether ntawm kev ua lag luam tuaj yeem ua tau raws li qhov xav tau ntawm ib puag ncig uas siv cov mortar (tshwj tsis yog rau ib puag ncig tshwj xeeb). Cov chaw tsim khoom yuav tsum xav txog qhov no.
Lub sijhawm tshaj tawm: Plaub Hlis-26-2024