Hydroxypropyl methylcellulose (HPMC) yog ib qho derivative ntawm cellulose thiab yog siv dav hauv ntau lub lag luam vim nws cov khoom tshwj xeeb. Nws yog nonnionic cellulose ether tau los ntawm kev hloov kho ntuj cellulose molecules nrog propylene oxide thiab methyl chloride. HPMC feem ntau yog muag hauv daim ntawv hmoov thiab yaj hauv dej los ua kom pom tseeb, tsis muaj xim, kua nplaum.
Cov yam ntxwv tseem ceeb ntawm HPMC muaj ntau haiv neeg thiab muaj txiaj ntsig zoo hauv ntau daim ntawv thov. Qee yam ntawm nws cov khoom tseem ceeb tshaj plaws muaj xws li dej tuav tus cwj pwm, thickening thiab film-forming zog. HPMC kuj yog ib qho chaw ruaj khov heev uas tsis tuaj yeem ua kom yooj yim vim qhov kub thiab txias.
Ib qho tseem ceeb tshaj plaws ntawm HPMC yog nws lub peev xwm khaws cov dej molecules. Nws cov khoom tuav dej yog qhov tseem ceeb hauv ntau yam kev siv, tshwj xeeb tshaj yog nyob rau hauv kev tsim kho thiab cov khoom siv. Thaum ntxiv rau cov cement lossis lwm yam khoom siv hauv tsev, HPMC tuaj yeem ua kom cov txheej txheem ziab kom qeeb, tiv thaiv kom tsis txhob qhuav dhau thiab nkig sai heev. Los ntawm khaws cov dej molecules, HPMC txhawb kev kho kom zoo thiab hydration, yog li ua kom lub zog thiab kav ntev ntawm cov khoom tiav.
Lwm yam khoom tseem ceeb ntawm HPMC yog nws lub peev xwm thickening. HPMC thickens cov kua los ntawm kev tsim cov gel network thaum yaj hauv dej. Thickening yog ib qho tseem ceeb hauv ntau qhov kev lag luam uas xav tau cov viscosity qib ntawm cov khoom. Piv txwv li, nyob rau hauv kev lag luam khoom noj khoom haus, HPMC yog siv los ua ib tug thickening neeg sawv cev nyob rau hauv cov kua ntsw thiab hnav khaub ncaws los txhim kho lawv cov kev ntxhib los mos thiab sib xws. Hauv kev lag luam kws tshuaj, HPMC yog siv los ua cov ntaub ntawv hauv cov ntsiav tshuaj los txhim kho lawv cov kev sib koom ua ke thiab kev sib cais.
HPMC kuj yog ib tus neeg ua yeeb yaj kiab zoo heev. Thaum yaj hauv dej, nws tuaj yeem tsim ib daim duab nyias, pob tshab, hloov tau yooj yim. Lub peev xwm ua yeeb yaj kiab ntawm HPMC ua rau nws yog ib qho khoom zoo tshaj plaws rau kev tsim cov ntaub ntawv ntawm qhov ncauj thiab cov ntaub so ntswg transdermal. Cov yeeb yaj kiab tsim cov khoom ntawm HPMC pab txhim kho kev nqus tshuaj los ntawm kev muab kev tiv thaiv ntawm cov tshuaj thiab ib puag ncig.
Ntxiv nrog rau kev tuav dej, thickening thiab zaj duab xis-tsim cov khoom, HPMC muaj lwm yam khoom tsim nyog. Piv txwv li, HPMC nthuav tawm cov khoom zoo rheological, txhais tau tias nws tuaj yeem siv los tswj cov dej ntws thiab viscosity ntawm cov kua. Nws muaj peev xwm binding siab ua rau nws khi cov khoom thiab cov sediments hauv cov kev daws teeb meem, ua rau nws muaj txiaj ntsig zoo hauv cov txheej txheem ncua kev kawm.
HPMC yog ib qho chaw ruaj khov nrog cov cua kub zoo thiab kev laus ua haujlwm. Nws tsis hnov mob nrog lwm yam tshuaj, ua rau nws sib xws nrog ntau yam khoom sib txawv. Nws stability kuj ua rau nws zoo tagnrho rau siv nyob rau hauv cov khoom uas yuav tsum tau ib tug ntev txee lub neej.
HPMC yog siv rau hauv ntau lub lag luam, suav nrog kev tsim kho, tshuaj, khoom siv tu tus kheej, khoom noj thiab tshuaj pleev ib ce. Hauv kev tsim kho, nws yog siv los ua tus neeg saib xyuas dej hauv cov cement, pob zeb thiab mortar los txhim kho kev ua haujlwm thiab sijhawm teem sijhawm. Hauv cov tshuaj, HPMC yog siv los ua ib qho kev sib khi, disintegrant, thiab tswj kev tso tawm tus neeg sawv cev hauv cov tshuaj ntsiav tshuaj. Nws kuj yog siv los ua viscosity modifier hauv cov tshuaj kho qhov muag.
Hauv kev lag luam tu tus kheej, HPMC yog siv los ua tus neeg sawv cev thickening hauv tshuaj zawv plaub hau, tshuaj pleev thiab lwm yam khoom zoo nkauj los txhim kho kev ntxhib los mos thiab viscosity. Nws kuj yog siv los ua ib tus neeg sawv cev ua yeeb yaj kiab hauv cov tshuaj pleev ib ce los pab txhim kho qhov kev faib tawm ntawm cov pigments thiab tiv thaiv clumping.
Hauv kev lag luam zaub mov, HPMC yog siv los ua cov thickener, emulsifier thiab stabilizer hauv cov khoom xws li cov khoom noj siv mis, kua zaub thiab dej haus. HPMC kuj tseem siv los ua tus neeg saib xyuas txheej thiab ua cov yeeb yaj kiab hauv cov txiv hmab txiv ntoo, zaub thiab khoom qab zib txheej.
HPMC yog ib qho kev sib xyaw ua ke nrog ntau yam khoom tsim nyog xws li kev tuav dej, thickening, thiab cov khoom ua yeeb yaj kiab. Vim nws cov khoom sib txawv, nws tau siv dav hauv ntau yam lag luam, suav nrog kev tsim kho, tshuaj, khoom siv tu tus kheej, khoom noj thiab tshuaj pleev ib ce. HPMC yog ib qho chaw ruaj khov heev uas tsis hnov mob nrog lwm cov ntaub ntawv, ua rau nws sib xws nrog ntau yam khoom sib txawv. Yog li, HPMC muaj ntau yam kev siv peev xwm thiab kev cia siab dav hauv ntau qhov kev lag luam.
Post lub sij hawm: Sep-13-2023