Hydroxypropyl methylcellulose (HPMC) yog ib yam khoom tseem ceeb uas siv tau ntau yam hauv kev lag luam tshuaj thiab lwm yam lag luam xws li khoom noj, tshuaj pleev ib ce thiab kev tsim kho. Qhov kev thov rau HPMC tau nce zuj zus ntau xyoo vim nws cov khoom tshwj xeeb xws li ua kom tuab, khi, tsim zaj duab xis thiab khaws dej. Hauv tsab xov xwm no, peb yuav tham txog txoj kev tsim cov tshuaj hydroxypropyl methylcellulose (HPMC) los ntawm alkaline.
Txoj kev tsim cov tshuaj hydroxypropyl methylcellulose (HPMC) los ntawm alkali yog ib txoj kev uas cellulose teb nrog propylene oxide thiab methyl chloride thaum muaj alkali. Cov txheej txheem no tshwm sim hauv qab qhov kub, siab thiab tswj lub sijhawm kom tsim cov khoom HPMC zoo.
Kauj ruam thawj zaug hauv kev tsim HPMC siv txoj kev tsim cov alkaline leaching yog kev npaj cov khoom siv cellulose raw. Cellulose yog thawj zaug purified los ntawm kev tshem tawm cov impurities thiab tom qab ntawd hloov mus rau hauv alkali cellulose los ntawm kev kho nrog alkali xws li sodium hydroxide. Kauj ruam no yog qhov tseem ceeb vim tias nws ua rau muaj kev cuam tshuam ntawm cellulose nrog cov reagents siv rau hauv cov kauj ruam tom ntej.
Cov cellulose alkali raug kho nrog cov khoom sib xyaw ntawm propylene oxide thiab methyl chloride nyob rau hauv kev tswj qhov kub thiab siab. Qhov kev sib xyaw ntawm alkali cellulose thiab cov reagent ua rau muaj cov khoom, uas yog cov khoom sib xyaw ntawm hydroxypropyl methylcellulose thiab lwm yam khoom seem.
Cov khoom sib tov no raug ntxuav, ua kom tsis muaj zog thiab lim kom tshem tawm cov khoom tsis huv xws li cov tshuaj reagents thiab cov khoom seem uas tsis tau ua haujlwm. Cov tshuaj uas tau los ntawm kev ua kom qhuav ces raug ua kom muaj zog los ntawm kev ua kom tau cov khoom HPMC uas muaj kev ntshiab siab.
Txoj kev tsim cov alkali leaching ntawm hydroxypropyl methylcellulose (HPMC) muaj ntau qhov zoo piv rau lwm txoj kev tsim khoom xws li etherification. Ib qho ntawm qhov zoo yog tias nws yog ib qho txheej txheem zoo rau ib puag ncig. Tsis zoo li lwm cov txheej txheem, txoj kev tsim cov alkali leaching tsis siv cov kuab tshuaj halogenated uas ua rau muaj kev phom sij rau ib puag ncig thiab tib neeg kev noj qab haus huv.
Lwm qhov zoo ntawm txoj kev no yog kev tsim cov khoom HPMC uas muaj kev ntshiab siab. Cov xwm txheej tswj hwm ua kom cov khoom kawg zoo ib yam thiab haum rau ntau yam kev siv.
Kev siv HPMC hauv kev lag luam tshuaj yog qhov tseem ceeb rau kev tsim cov ntsiav tshuaj, tshuaj ntsiav thiab lwm yam tshuaj. HPMC tuaj yeem siv ua cov khoom sib txuas, cov khoom tawg, cov neeg sawv cev txheej, thiab lwm yam. Kev siv HPMC hauv cov ntawv thov no ua kom ntseeg tau tias cov tshuaj muaj txiaj ntsig zoo thiab ua tau raws li cov qauv xav tau.
HPMC kuj tseem siv ua cov khoom ua kom tuab, emulsifier thiab stabilizer hauv kev lag luam zaub mov. Kev siv HPMC hauv cov khoom noj khoom haus ua kom muaj kev sib xws, viscosity thiab zoo.
Hauv kev lag luam kev tsim kho, HPMC yog siv los ua cov khoom siv ntxiv rau cov cement kom txhim kho kev ua haujlwm tau zoo, kev khaws dej thiab kev sib txuas ntawm cov cement. Kev siv HPMC ua kom ntseeg tau tias cov khoom siv hauv kev tsim kho muaj txiaj ntsig zoo thiab ua tau raws li cov qauv xav tau.
Hauv kev xaus, txoj kev tsim cov alkali leaching ntawm hydroxypropyl methylcellulose (HPMC) yog ib txoj kev rau kev tsim cov khoom lag luam HPMC zoo thiab siv dav hauv ntau yam lag luam xws li tshuaj, khoom noj, thiab kev tsim kho. Kev siv HPMC hauv cov ntawv thov no ua kom ntseeg tau tias cov khoom lag luam zoo thiab ua tau raws li cov qauv xav tau. Txoj kev tsim khoom no kuj yog ib puag ncig zoo thiab tsim cov khoom lag luam HPMC huv si.
Lub sijhawm tshaj tawm: Cuaj hlis-15-2023