Hydroxypropyl methylcellulose yog siv los ua raw khoom substrate los tsim cov roj, uas tuaj yeem paub txog kev siv tag nrho cov suab thaj, txhim kho tus nqi ntawm cov khoom siv raw, txo cov seem ntawm cov substrate hauv fermentation broth, thiab txo cov nqi kho dej khib nyiab. Qhov no hydroxypropyl methylcellulose Cov yam ntxwv tseem ceeb yog qhov tsim nyog rau kev ua kom zoo ntawm batch, pub-batch thiab cov txheej txheem fermentation tsis tu ncua, zam cov teeb meem xws li kev tswj hwm ntawm nruab nrab muaj pes tsawg leeg thiab dilution tus nqi; Nws kuj yog qhov tsim nyog rau kev tswj hwm ntawm cov txheej txheem fermentation.
Hydroxypropyl methylcellulose, raw khoom cellulose, tuaj yeem ua kom zoo nkauj paj rwb lossis ntoo pulp. Nws yog ib qho tsim nyog yuav tau zuaj nws ua ntej alkalization los yog thaum lub sij hawm alkalization. Lub crushing yog ua kom puas cov cellulose raw khoom los ntawm txhua yam zog. Lub xeev cov qauv ntawm cov cellulose macromolecules tuaj yeem txo qhov degree ntawm crystallinity thiab polymerization, ua rau nws cov cheeb tsam saum npoo, yog li txhim kho kev nkag tau thiab tshuaj lom neeg muaj peev xwm ntawm cov tshuaj tiv thaiv reagent rau peb pawg hydroxyl ntawm cov piam thaj hauv pawg ntawm cellulose macromolecule.
Txawm hais tias cov txheej txheem synthesis ntawm etherification ntawm hydroxypropyl methylcellulose tsis nyuaj, ntau qhov chaw ntawm alkalization, raw khoom crushing, etherification, hnyav rov qab, centrifugal sib cais, ntxuav thiab ziab muaj ntau yam tseem ceeb technologies thiab nplua nuj kev paub connotations. 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.
Txij li qhov kev ua tau zoo ntawm hydroxypropyl methylcellulose 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 ua cov yeeb yaj kiab tsim, thickener, emulsifier thiab stabilizer.
Ua kom cov zaj duab xis txheej muaj qhov hnav tsis kam, qib thiab adhesion, thiab txhim kho qhov nro, ruaj khov rau cov kua qaub thiab alkali, thiab kev sib raug zoo rau cov xim hlau xim. Hydroxypropyl methylcellulose muaj cov nyhuv zoo ua 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 tseem txhim kho.
Post lub sij hawm: Dec-22-2022