Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer uas muaj ntau yam los ntawm cellulose, ib qho polysaccharide uas muaj nyob rau hauv cov phab ntsa ntawm cov nroj tsuag. Nws feem ntau siv rau hauv ntau yam lag luam xws li tshuaj, khoom noj, tshuaj pleev ib ce, kev tsim kho, thiab ntau ntxiv vim nws cov yam ntxwv tshwj xeeb.
HPMC yog synthesized los ntawm kev hloov kho cellulose los ntawm kev sib xyaw ua ke ntawm etherification reactions. Tshwj xeeb, nws yog tsim los ntawm kev kho cellulose nrog kev sib xyaw ua ke ntawm propylene oxide thiab methyl chloride los qhia hydroxypropyl thiab methyl pawg rau ntawm cellulose backbone. Cov txheej txheem no ua rau cov polymer yaj hauv dej nrog cov khoom zoo dua piv rau cov cellulose ib txwm muaj.
Txheej Txheem Tsim Khoom:
Kev tsim cov HPMC muaj ntau kauj ruam:
Kev Nrhiav Cellulose: Cellulose, feem ntau yog los ntawm cov ntoo pulp lossis paj rwb, ua haujlwm ua cov khoom siv pib.
Etherification: Cellulose raug etherification, qhov twg nws reacts nrog propylene oxide thiab methyl chloride nyob rau hauv kev tswj hwm tej yam kev mob los qhia hydroxypropyl thiab methyl pawg.
Kev ntxuav: Cov khoom tsim tawm dhau los ntawm cov kauj ruam ntxuav kom tshem tawm cov khoom tsis huv thiab cov khoom tsis xav tau.
Kev Qhuav thiab Milling: HPMC uas tau lim lawm ces qhuav thiab milled ua hmoov zoo lossis granules, nyob ntawm seb daim ntawv thov xav tau.
HPMC muaj ntau yam khoom, ua rau nws haum rau ntau yam kev siv:
Kev Yaj Hauv Dej: HPMC yaj tau hauv dej txias, tsim cov tshuaj ntshiab, khov kho. Kev yaj tuaj yeem hloov kho los ntawm kev hloov kho qib ntawm kev hloov pauv (DS) ntawm hydroxypropyl thiab methyl pawg.
Kev Tsim Zaj Duab Xis: Nws tuaj yeem tsim cov zaj duab xis uas yoog tau thiab sib koom ua ke thaum qhuav, ua rau nws tsim nyog rau kev siv txheej hauv kev lag luam tshuaj thiab zaub mov.
Ua kom tuab: HPMC yog ib qho tshuaj ua kom tuab zoo, muab kev tswj hwm viscosity hauv ntau yam qauv xws li tshuaj pleev, tshuaj pleev, thiab xim.
Kev Ruaj Ntseg: Nws ua kom pom kev ruaj khov tshuaj lom neeg zoo heev thiab tiv taus kev puas tsuaj ntawm cov kab mob me me.
Kev Sib Xws: HPMC sib xws nrog ntau yam khoom xyaw, suav nrog surfactants, ntsev, thiab preservatives.
HPMC pom ntau daim ntawv thov thoob plaws ntau yam lag luam:
Cov Tshuaj: Nws feem ntau yog siv los ua tus binder, tus neeg sawv cev txheej zaj duab xis, tus hloov kho viscosity, thiab cov matrix tso tawm tas mus li hauv cov qauv ntsiav tshuaj.
Kev Lag Luam Khoom Noj: HPMC ua haujlwm ua cov khoom ua kom tuab, ruaj khov, thiab emulsifier hauv cov khoom noj xws li cov kua ntses, cov khaub ncaws hnav, thiab cov khoom qab zib.
Kev Tsim Kho: Hauv kev lag luam kev tsim kho, HPMC yog siv los ua cov khoom siv tuab hauv cov khoom siv cement, txhim kho kev ua haujlwm thiab kev nplaum.
Cov Khoom Siv Saib Xyuas Tus Kheej: Nws pom muaj nyob rau hauv cov tshuaj pleev ib ce, tshuaj zawv plaub hau, thiab tshuaj txhuam hniav ua tus neeg sawv cev tuab, emulsifier, thiab zaj duab xis former.
Xim thiab Txheej: HPMC txhim kho cov khoom rheological ntawm cov xim thiab txheej, txhim kho lawv daim ntawv thov thiab kev ua tau zoo.
HPMC, muab los ntawm cellulose los ntawm kev sib xyaw ua ke, yog ib qho polymer uas muaj ntau yam kev siv thoob plaws ntau yam lag luam. Nws cov yam ntxwv tshwj xeeb, xws li kev yaj dej, muaj peev xwm tsim zaj duab xis, thiab cov khoom ua kom tuab, ua rau nws tseem ceeb heev hauv kev lag luam tshuaj, khoom noj, kev tsim kho, thiab cov khoom siv tu tus kheej.
Lub sijhawm tshaj tawm: Plaub Hlis-17-2024