Hydroxypropyl methylcellulose (HPMC) yog ib yam khoom tseem ceeb uas muaj ntau yam kev siv hauv kev lag luam kws tshuaj thiab lwm yam lag luam xws li zaub mov, tshuaj pleev ib ce thiab kev tsim kho. Qhov kev thov rau HPMC tau loj hlob tsis tu ncua ntau xyoo vim nws cov khoom tshwj xeeb xws li thickening, binding, film-forming thiab water retention. Hauv tsab xov xwm no, peb yuav tham txog alkaline leaching ntau lawm txoj kev ntawm hydroxypropyl methylcellulose (HPMC).
Cov txheej txheem alkali leaching ntau lawm ntawm hydroxypropyl methylcellulose (HPMC) yog txheej txheem uas cellulose reacts nrog propylene oxide thiab methyl chloride nyob rau hauv lub xub ntiag ntawm alkali. Cov txheej txheem yuav siv qhov chaw nyob rau hauv qhov kub thiab txias, siab thiab lub sij hawm tswj tej yam kev mob los tsim cov khoom zoo HPMC.
Thawj kauj ruam hauv kev tsim HPMC siv cov txheej txheem alkaline leaching ntau lawm yog kev npaj ntawm cellulose raw khoom. Cellulose yog thawj purified los ntawm kev tshem tawm tej impurities thiab ces hloov mus rau hauv alkali cellulose los ntawm kev kho nrog ib tug alkali xws li sodium hydroxide. Cov kauj ruam no yog qhov tseem ceeb vim tias nws ua rau kom muaj kev ua haujlwm ntawm cellulose nrog cov tshuaj reagents siv hauv cov kauj ruam tom ntej.
Alkali cellulose yog kho nrog sib tov ntawm propylene oxide thiab methyl chloride nyob rau hauv kev tswj kub thiab siab. Cov tshuaj tiv thaiv ntawm alkali cellulose thiab cov reagent ua rau tsim ib yam khoom, uas yog ib tug sib tov ntawm hydroxypropyl methylcellulose thiab lwm yam by-products.
Cov sib tov yog ntxuav, neutralized thiab lim kom tshem tawm impurities xws li unreacted reagents thiab by-products. Cov kev daws teeb meem yog ces concentrated los ntawm evaporation kom tau ib tug siab purity HPMC khoom.
Cov txheej txheem alkali leaching ntau lawm ntawm hydroxypropyl methylcellulose (HPMC) muaj ntau yam zoo piv nrog rau lwm txoj kev tsim khoom xws li etherification. Ib qho ntawm qhov zoo yog tias nws yog cov txheej txheem ntau dua ib puag ncig. Tsis zoo li lwm cov txheej txheem, cov txheej txheem alkali leaching ntau lawm tsis siv cov kuab tshuaj halogenated uas tsim kev puas tsuaj rau ib puag ncig thiab tib neeg kev noj qab haus huv.
Lwm qhov zoo dua ntawm txoj kev no yog kev tsim cov khoom lag luam siab huv HPMC. Kev tswj cov tshuaj tiv thaiv kom ntseeg tau tias cov khoom kawg yog qhov zoo ib yam thiab haum rau ntau yam kev siv.
Kev siv HPMC hauv kev lag luam kws tshuaj yog qhov tseem ceeb rau kev tsim cov ntsiav tshuaj, tshuaj ntsiav thiab lwm yam tshuaj. HPMC tuaj yeem siv los ua cov khoom sib khi, cov khoom tsis sib xws, cov txheej txheem txheej txheej, thiab lwm yam. Kev siv HPMC hauv cov ntawv thov no ua kom ntseeg tau tias daim ntawv ntau npaum yog qhov zoo thiab ua tau raws li cov qauv xav tau.
HPMC kuj tseem siv los ua cov thickener, emulsifier thiab stabilizer hauv kev lag luam khoom noj. Kev siv HPMC hauv cov khoom noj khoom haus kom zoo ib yam kev ntxhib los mos, viscosity thiab zoo.
Hauv kev tsim kho kev lag luam, HPMC yog siv los ua cov cement ntxiv los txhim kho kev ua haujlwm, kev tuav dej thiab kev sib txuas ntawm cov cement. Kev siv HPMC ua kom ntseeg tau tias cov khoom tsim kho tau zoo thiab ua tau raws li cov qauv xav tau.
Hauv cov ntsiab lus, alkali leaching ntau lawm txoj kev ntawm hydroxypropyl methylcellulose (HPMC) yog cov txheej txheem los tsim cov khoom zoo HPMC thiab tau 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 cov khoom muaj txiaj ntsig zoo thiab ua tau raws li cov qauv xav tau. Txoj kev tsim khoom no kuj yog ib puag ncig tus phooj ywg thiab tsim cov khoom lag luam HPMC siab.
Post lub sij hawm: Sep-15-2023