Hydroxypropyl methylcellulose yog siv los ua cov khoom siv raw substrate los tsim cov roj, uas tuaj yeem paub txog kev siv tag nrho cov suab thaj, txhim kho tus nqi siv ntawm cov khoom siv raw, txo cov khoom seem ntawm cov substrate hauv cov kua fermentation, thiab txo tus nqi ntawm kev kho dej khib nyiab. Qhov hydroxypropyl methylcellulose no Lub ntsiab lus tseem ceeb yog qhov zoo rau kev ua kom zoo dua ntawm cov txheej txheem batch, pub-batch thiab cov txheej txheem fermentation tas mus li, zam ntau yam teeb meem xws li kev tswj hwm cov khoom nruab nrab thiab tus nqi dilution; nws kuj tseem zoo rau kev tswj hwm ntawm cov txheej txheem fermentation.
Hydroxypropyl methylcellulose, cov khoom siv raw cellulose, tuaj yeem yog paj rwb lossis ntoo pulp uas tau ua kom zoo. Nws yog qhov tsim nyog heev rau kev tsoo nws ua ntej alkalization lossis thaum lub sijhawm alkalization. Kev tsoo yog los rhuav tshem cov khoom siv raw cellulose los ntawm lub zog tshuab. Cov qauv sib sau ua ke ntawm cov cellulose macromolecules tuaj yeem txo qib ntawm crystallinity thiab polymerization, nce nws thaj chaw, yog li txhim kho kev nkag mus thiab kev muaj peev xwm tshuaj lom neeg ntawm cov tshuaj tiv thaiv rau peb pawg hydroxyl ntawm pawg glucose ntawm cellulose macromolecule.
Txawm hais tias txoj cai tsim cov hydroxypropyl methylcellulose etherification tsis nyuaj, ntau qhov chaw ntawm alkalization, raw khoom crushing, etherification, solvent recovery, centrifugal separation, ntxuav thiab ziab muaj ntau yam thev naus laus zis tseem ceeb thiab kev paub nplua nuj. Rau ntau hom khoom, txhua qhov chaw muaj cov xwm txheej tswj hwm tshiab, xws li kub, sijhawm, siab thiab cov khoom siv tswj hwm. Cov khoom siv pabcuam thiab cov cuab yeej tswj hwm yog cov lus lees paub zoo rau cov khoom zoo ruaj khov thiab cov txheej txheem tsim khoom txhim khu kev qha.
Vim tias qhov kev ua tau zoo ntawm hydroxypropyl methylcellulose zoo ib yam li lwm cov ethers uas yaj tau hauv dej, nws tuaj yeem siv rau hauv cov xim latex thiab cov khoom siv xim uas yaj tau hauv dej ua tus neeg sawv cev tsim zaj duab xis, cov khoom ua kom tuab, cov khoom ua kom emulsifier thiab cov khoom ruaj khov.
Ua kom cov zaj duab xis txheej muaj kev tiv thaiv kev hnav zoo, kev sib npaug thiab kev nplaum, thiab txhim kho qhov nro ntawm qhov chaw, kev ruaj khov rau cov kua qaub thiab alkali, thiab kev sib raug zoo rau cov xim hlau. Hydroxypropyl methylcellulose muaj cov txiaj ntsig zoo ua cov khoom tuab rau cov xim dawb polyvinyl acetate. Qib ntawm kev hloov pauv ntawm cellulose ether nce ntxiv, thiab kev tiv thaiv kab mob kuj nce ntxiv.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-22-2022