Cellulose ether yog ib qho hluavtaws polymer ua los ntawm ntuj cellulose los ntawm kev hloov tshuaj lom neeg. Cellulose ether yog derivative ntawm natural cellulose. Kev tsim cov cellulose ether yog txawv los ntawm hluavtaws polymers. Nws cov khoom siv yooj yim tshaj plaws yog cellulose, lub ntuj polymer compound. Vim qhov tshwj xeeb ntawm cov qauv cellulose, cellulose nws tus kheej tsis muaj peev xwm ua rau cov tshuaj etherification. Txawm li cas los xij, tom qab kev kho mob ntawm tus neeg mob o, lub zog hydrogen bonds ntawm cov saw hlau molecular thiab cov chains raug rhuav tshem, thiab cov active tso tawm ntawm pawg hydroxyl los ua reactive alkali cellulose. Tau txais cellulose ether.
Cov khoom ntawm cellulose ethers nyob ntawm seb hom, tus lej thiab kev faib tawm ntawm cov khoom hloov pauv. Kev faib tawm ntawm cellulose ethers kuj yog nyob ntawm hom kev hloov pauv, qib ntawm etherification, solubility thiab lwm yam khoom siv. Raws li hom kev hloov pauv ntawm cov saw hlau molecular, nws tuaj yeem muab faib ua monoether thiab sib xyaw ether. Peb feem ntau siv mc li monoether, thiab HPmc li sib xyaw ether. Methyl cellulose ether mc yog cov khoom lag luam tom qab cov pab pawg hydroxyl ntawm cov piam thaj hauv cov cellulose ntuj raug hloov los ntawm pawg methoxy. Nws yog ib qho khoom tau los ntawm kev hloov ib feem ntawm pawg hydroxyl ntawm chav tsev nrog methoxy pawg thiab lwm qhov nrog ib pawg hydroxypropyl. Cov qauv qauv yog [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3]n] x Hydroxyethyl methyl cellulose ether HEmc, cov no yog cov hom tseem ceeb uas tau siv dav thiab muag hauv khw.
Nyob rau hauv cov nqe lus ntawm solubility, nws yuav muab faib ua ionic thiab non-ionic. Dej-soluble non-ionic cellulose ethers yog tsim los ntawm ob series ntawm alkyl ethers thiab hydroxyalkyl ethers. Ionic Cmc feem ntau yog siv rau hauv cov khoom siv hluavtaws, textile printing thiab dyeing, zaub mov thiab roj tshawb nrhiav. Non-ionic mc, HPmc, HEmc, thiab lwm yam yog siv rau hauv kev tsim cov ntaub ntawv, latex coatings, tshuaj, tshuaj txhua hnub, thiab lwm yam. Siv ua thickener, dej tuav tus neeg saib xyuas, stabilizer, dispersant thiab zaj duab xis tsim tus neeg sawv cev.
Post lub sij hawm: Nov-24-2022