Hydroxyethyl cellulose (HEC) yog xim dawb los yog lub teeb daj, tsis muaj ntxhiab tsw, tsis muaj tshuaj lom fiber ntau lossis hmoov hmoov, ua los ntawm cov paj rwb nyoos los yog cov tawv nqaij ua kom zoo rau hauv 30% kua alkali, tshem tawm thiab nias tom qab ib nrab teev, nyem kom txog thaum qhov sib piv. Cov dej alkaline nce mus txog 1: 2.8, ces crush. Nws yog prepa ...
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