Hydroxypropyl methylcellulose (HPMC), raw cellulose, tuaj yeem ua kom zoo nkauj paj rwb lossis ntoo pulp, nws yog ib qho tsim nyog yuav tsum tau crushed ua ntej alkalization los yog thaum lub sij hawm alkalization, thiab lub crushing yog los ntawm cov neeg kho tshuab zog rhuav tshem cov aggregate qauv ntawm cellulose raw cov ntaub ntawv los txo cov degree ntawm crystallinity thiab polymerization, nce nws qhov chaw saum npoo, yog li txhim kho kev nkag tau yooj yim thiab tshuaj lom neeg muaj peev xwm ntawm cov tshuaj tiv thaiv reagent rau peb pawg hydroxyl ntawm cov suab thaj pawg ntawm cellulose macromolecule.
Hydroxypropyl methylcellulose (HPMC) yog siv los ua cov khoom siv raw khoom siv los tsim cov roj, uas tuaj yeem paub txog kev siv tag nrho cov suab thaj, txhim kho kev siv cov ntaub ntawv raw, txo cov seem ntawm cov substrate hauv fermentation broth, thiab txo tus nqi ntawm cov dej khib nyiab. kev kho mob. Qhov no hydroxypropyl methylcellulose Cov yam ntxwv ntawm methylcellulose yog qhov tsim nyog rau kev ua kom zoo ntawm batch, pub-batch thiab cov txheej txheem fermentation tsis tu ncua, tsis txhob muaj teeb meem xws li kev tswj cov kev sib xyaw ntawm qhov nruab nrab thiab dilution tus nqi; Nws kuj yog qhov tsim nyog rau kev tswj hwm ntawm cov txheej txheem fermentation. Txij li qhov kev ua tau zoo ntawm hydroxypropyl methylcellulose (HPMC) zoo ib yam li lwm cov dej-soluble ethers, nws tuaj yeem siv rau hauv cov xim latex thiab cov xim dej-soluble resin xim raws li cov yeeb yaj kiab tsim, thickener, emulsifier thiab stabilizer, thiab lwm yam. zoo hnav tsis kam, leveling thiab adhesion, thiab tau txhim kho nto nro, stability rau acid thiab alkali, thiab compatibility rau metallic pigments.
Hydroxypropyl methylcellulose (HPMC) muaj cov nyhuv zoo li cov thickener rau cov xim dej dawb-raws li polyvinyl acetate. Lub degree ntawm kev hloov ntawm cellulose ether yog nce, thiab kev tiv thaiv rau cov kab mob erosion kuj txhim kho.
Txawm hais tias txoj cai etherification synthesis ntawm hydroxypropyl methyl cellulose (HPMC) tsis nyuaj, nws yuav tsum tau alkalized, raw khoom pulverized, thiab alkalized. Txhua qhov chaw ntawm etherification, hnyav rov qab, centrifugation, ntxuav thiab ziab muaj ntau cov thev naus laus zis tseem ceeb thiab kev paub nplua nuj.
Rau ntau hom khoom, txhua qhov chaw muaj kev tswj xyuas qhov tseeb, xws li kub, sijhawm, siab thiab cov khoom ntws tswj. Cov cuab yeej pabcuam thiab cov cuab yeej tswj tau muaj txiaj ntsig zoo rau cov khoom lag luam ruaj khov thiab txhim khu kev qha ntau lawm.
Post lub sij hawm: Dec-15-2022