Cov tshuaj txhua hnub qib hydroxypropyl methylcellulose yog cov khoom siv hluavtaws ua los ntawm ntuj cellulose los ntawm kev hloov kho tshuaj. 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. Tom qab cov tshuaj tiv thaiv ntawm tus neeg sawv cev etherifying, pawg -OH tau hloov mus rau hauv ib pawg LOSSIS tau txais cellulose ether. Lub 200,000-viscosity hydroxypropyl methylcellulose rau "Max" qib tshuaj txhua hnub yog cov hmoov dawb los yog daj me ntsis, uas tsis muaj ntxhiab, tsis qab thiab tsis muaj tshuaj lom. Nws tuaj yeem yaj hauv dej txias thiab sib xyaw hnyav ntawm cov organic teeb meem los tsim cov kua nplaum pob tshab.
Cov dej-siv cov kua dej muaj qhov ua haujlwm saum npoo av, siab pob tshab, muaj zog ruaj khov, thiab tsis cuam tshuam los ntawm pH thaum yaj hauv dej. Nws muaj cov nyhuv thickening thiab antifreeze nyob rau hauv cov tshuaj zawv plaub hau thiab cov gels da dej, thiab muaj cov dej tuav thiab cov yeeb yaj kiab zoo rau cov plaub hau thiab tawv nqaij. Nrog rau kev nce siab ntawm cov khoom siv raw, kev siv cellulose (antifreeze thickener) hauv tshuaj zawv plaub hau thiab da dej gel tuaj yeem txo tus nqi thiab ua tiav cov txiaj ntsig xav tau.
Post lub sij hawm: Apr-21-2023