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 ether kuj raug cais raws li 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. MC peb feem ntau siv yog monoether, thiab HPMC yog sib xyaw ether. Methyl cellulose ether MC yog cov khoom lag luam tom qab pawg hydroxyl ntawm cov piam thaj hauv cov cellulose ntuj hloov los ntawm 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 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.
Kev txheeb xyuas qhov zoo ntawm cellulose ether:
Cov nyhuv ntawm methoxyl cov ntsiab lus ntawm qhov zoo: dej tuav thiab thickening muaj nuj nqi
Kev cuam tshuam zoo ntawm hydroxyethoxyl / hydroxypropoxyl cov ntsiab lus: cov ntsiab lus siab dua, cov dej tuav tau zoo dua.
Kev cuam tshuam ntawm viscosity zoo: qhov siab dua ntawm polymerization, qhov siab dua qhov viscosity thiab cov dej tuav tau zoo dua.
Kev cuam tshuam ntawm kev ua kom zoo: qhov zoo dua qhov tawg thiab tawg hauv cov mortar, qhov nrawm dua thiab zoo dua qub, thiab cov txheeb ze dej tuav tau zoo dua.
Kev cuam tshuam zoo ntawm lub teeb xa hluav taws xob: qhov siab dua ntawm polymerization, qhov sib txawv ntawm cov degree ntawm polymerization, thiab tsawg impurities
Gel kub zoo cuam tshuam: gel kub rau kev tsim kho yog nyob ib ncig ntawm 75 ° C
Kev cuam tshuam ntawm cov dej zoo: <5%, cellulose ether yog ib qho yooj yim los nqus dej noo, yog li nws yuav tsum tau muab kaw thiab khaws cia.
Tshauv zoo cuam tshuam: <3%, qhov siab dua cov tshauv, ntau impurities
PH tus nqi zoo cuam tshuam: ze rau nruab nrab, cellulose ether muaj kev ua haujlwm ruaj khov ntawm PH: 2-11
Post lub sij hawm: Feb-14-2023