Cellulose Ether

Cellulose etheryog tsim los ntawm cellulose los ntawm etherification cov tshuaj tiv thaiv ntawm ib los yog ob peb etherification agents thiab qhuav sib tsoo. Raws li cov qauv tshuaj sib txawv ntawm ether substituents, cellulose ethers tuaj yeem muab faib ua anionic, cationic thiab nonionic ethers. Ionic cellulose ethers feem ntau suav nrogCarboxymethyl cellulose ether (CMC); non-ionic cellulose ethers feem ntau suav nrogTom ntej: Methyl Cellulose Ether (MC),Hydroxypropyl methyl cellulose ether (HPMC)thiab hydroxyethyl cellulose ether.Chlorine ether (HC)thiab lwm yam. Tsis yog-ionic ethers tau muab faib ua dej-soluble ethers thiab roj-soluble ethers, thiab cov dej-soluble ethers uas tsis yog-ionic feem ntau yog siv rau hauv cov khoom khib nyiab. Nyob rau hauv lub xub ntiag ntawm calcium ions, ionic cellulose ether yog tsis ruaj tsis khov, yog li nws tsis tshua muaj siv nyob rau hauv qhuav-mixed mortar khoom uas siv cov cement, slaked txiv qaub, thiab lwm yam raws li cov ntaub ntawv cementing. Nonionic dej-soluble cellulose ethers yog dav siv nyob rau hauv lub tsev cov ntaub ntawv kev lag luam vim hais tias ntawm lawv suspension stability thiab dej tuav.

Chemical Properties ntawm Cellulose Ether

Txhua cellulose ether muaj cov qauv ntawm cellulose - Anhydroglucose qauv. Nyob rau hauv tus txheej txheem ntawm kev tsim cellulose ether, cellulose fiber yog thawj rhuab nyob rau hauv ib tug alkaline tov, thiab ces kho nrog ib tug etherifying tus neeg sawv cev. Cov khoom siv tshuaj tiv thaiv fibrous yog purified thiab pulverized los ua cov hmoov sib xws nrog ib qho kev nplua nuj.

Hauv kev tsim khoom ntawm MC, tsuas yog methyl chloride yog siv los ua tus neeg sawv cev etherification; Ntxiv nrog rau methyl chloride, propylene oxide kuj tseem siv tau kom tau txais cov pab pawg hydroxypropyl hauv kev tsim HPMC. Ntau yam cellulose ethers muaj qhov sib txawv ntawm methyl thiab hydroxypropyl hloov pauv, uas cuam tshuam rau cov organic compatibility thiab thermal gelation kub ntawm cellulose ether daws.