Cellulose Ether

Cellulose etheryog ua los ntawm cellulose los ntawm kev sib xyaw ua ke ntawm ib lossis ntau tus neeg sawv cev etherification thiab kev sib tsoo qhuav. Raws li cov qauv tshuaj sib txawv ntawm cov ether substituents, cellulose ethers tuaj yeem faib ua anionic, cationic thiab nonionic ethers. Ionic cellulose ethers feem ntau suav nrogcarboxymethyl cellulose ether (CMC); cov non-ionic cellulose ethers feem ntau suav nrogmethyl cellulose ether (MC),Hydroxypropyl methyl cellulose ether (HPMC)thiab hydroxyethyl cellulose ether.Cov tshuaj chlorine ether (HC)thiab lwm yam. Cov ethers uas tsis yog ionic raug muab faib ua cov ethers uas yaj tau hauv dej thiab cov ethers uas yaj tau hauv roj, thiab cov ethers uas yaj tau hauv dej uas tsis yog ionic feem ntau yog siv rau hauv cov khoom siv mortar. Thaum muaj calcium ions, ionic cellulose ether tsis ruaj khov, yog li nws tsis tshua siv rau hauv cov khoom siv mortar qhuav uas siv cement, slaked lime, thiab lwm yam ua cov khoom siv cementing. Cov cellulose ethers uas yaj tau hauv dej uas tsis yog ionic yog siv dav hauv kev lag luam khoom siv hauv tsev vim lawv qhov kev ruaj khov thiab kev khaws cia dej.

Cov Khoom Siv Tshuaj ntawm Cellulose Ether

Txhua lub cellulose ether muaj cov qauv yooj yim ntawm cellulose - Anhydroglucose qauv. Hauv cov txheej txheem ntawm kev tsim cov cellulose ether, cov cellulose fiber thawj zaug raug cua sov hauv cov kua alkaline, thiab tom qab ntawd kho nrog tus neeg sawv cev etherifying. Cov khoom siv fibrous reaction yog purified thiab pulverized los ua cov hmoov sib xws nrog qee qhov fineness.

Hauv cov txheej txheem ntau lawm ntawm MC, tsuas yog methyl chloride siv ua tus neeg sawv cev etherification; ntxiv rau methyl chloride, propylene oxide kuj tseem siv los tau txais cov pab pawg hydroxypropyl substituent hauv kev tsim HPMC. Ntau yam cellulose ethers muaj cov piv sib txawv methyl thiab hydroxypropyl hloov pauv, uas cuam tshuam rau qhov sib xws ntawm cov organic thiab qhov kub thiab txias ntawm cov cellulose ether.