Muaj ntau tus neeg siv tsis tshua them sai sai rau qhov teeb meem ntawm qhov kub ntawm hydroxypropyl methylcellulose. Niaj hnub no, hydroxypropyl methylcellulose feem ntau yog qhov sib txawv raws li viscosity, tab sis rau qee qhov chaw tshwj xeeb thiab kev lag luam tshwj xeeb, tsuas yog qhov viscosity ntawm cov khoom raug cuam tshuam. Tsis txaus, cov hauv qab no luv luv qhia txog qhov kub ntawm hydroxypropyl methylcellulose.
Cov ntsiab lus ntawm methyl acid yog ncaj qha cuam tshuam rau qib ester-forming ntawm cellulose ester, thiab cov ntsiab lus ntawm methyl acid raug kho kom tswj tau cov qauv, qhov kub thiab lub sijhawm teb. Tib lub sijhawm, qib ntawm ether kua cuam tshuam rau cov ntsiab lus ntawm hydroxyethyl lossis hydroxyapatite. Yog li ntawd, cellulose ethers ntawm qhov kub thiab txias feem ntau ntawm cov gel yuav tsis ntub. Cov txheej txheem tsim khoom no yuav tsum ua tau, yog li es tsis txhob muaj cov methoxides qis, cellulose ethers yuav kim dua me ntsis.
Qhov kub ntawm cov gel tau txiav txim siab nrog methoxide thiab hydroxyproazepam nrog hydroxyproxin. Tsuas yog peb pawg tuaj yeem hloov pauv ntawm cellulose. Nrhiav qhov kub thiab txias kom raug, khaws cov av noo, thiab txiav txim siab cov qauv ntawm cov pulp. Qhov kub ntawm cov gel yog qhov tseem ceeb rau kev siv cellulose ether. Thaum qhov kub thiab txias ib puag ncig tshaj qhov kub ntawm gel, cov cellulose ether yuav raug tso tawm ntawm dej. Qhov kub ntawm cov pulp ntawm kev ua lag luam yog feem ntau kom tau raws li qhov xav tau ntawm cov tshuaj hauv ib puag ncig (tshwj tsis yog cov xwm txheej tshwj xeeb). Nws ntseeg tau tias thaum siv cov tshuaj, nws tsis tas yuav tsum tau them sai sai rau cov ntsuas kev ua tau zoo thaum siv cov gel. Tau kawg, tus neeg tsim khoom ntawm cellulose ether yuav tsum coj nws mus rau hauv tus account qhov ntsuas no.
Lub sijhawm tshaj tawm: Plaub Hlis-21-2023