Hydroxypropyl methylcellulose (HPMC) yog cov khoom siv tshuaj lom neeg uas siv dav hauv kev lag luam. Nws yog non-ionic cellulose ether, feem ntau tau los ntawm kev hloov kho tshuaj ntawm ntuj cellulose. Nws cov ntsiab lus tseem ceeb yog tias pawg hydroxyl hauv cov cellulose molecules tau hloov los ntawm methoxy thiab hydroxypropyl pawg. HPMC tau siv dav hauv ntau qhov chaw xws li kev tsim kho, txheej txheej, tshuaj, khoom noj, thiab tshuaj pleev ib ce vim nws lub cev thiab tshuaj lom neeg tshwj xeeb.
1. Lub cev thiab tshuaj muaj zog
HPMC muaj cov dej solubility zoo thiab tuaj yeem yaj sai sai hauv dej txias los tsim cov pob tshab lossis cov kua mis me me colloidal. Nws cov kua dej aqueous muaj viscosity siab, thiab nws cov viscosity muaj feem xyuam rau cov concentration, kub thiab degree ntawm kev hloov cov tshuaj. HPMC yog ruaj khov nyob rau hauv ib tug dav pH ntau yam thiab muaj zoo kam rau acids thiab alkalis. Tsis tas li ntawd, nws muaj cov yeeb yaj kiab zoo heev, adhesion, dej tuav thiab thickening zog.
2. Cov txheej txheem ntau lawm
Cov txheej txheem tsim khoom ntawm HPMC feem ntau suav nrog cov kauj ruam xws li kev kho alkali, etherification cov tshuaj tiv thaiv thiab kev kho tom qab. Ua ntej, ntuj cellulose yog pretreated nyob rau hauv alkaline tej yam kev mob rau qhib nws, ces etherified nrog methoxylating agents thiab hydroxypropylating agents, thiab thaum kawg cov khoom kawg yog tau los ntawm neutralization, ntxuav, ziab thiab crushing. Thaum lub sij hawm tsim cov txheej txheem, cov tshuaj tiv thaiv xws li kub, siab, lub sij hawm tshuaj tiv thaiv thiab tus nqi ntawm ntau yam reagents yuav cuam tshuam qhov zoo thiab kev ua tau zoo ntawm HPMC.
3. Daim ntawv thov teb
3.1 Kev tsim kho kev lag luam
Hauv kev tsim kho kev lag luam, HPMC feem ntau yog siv los ua cov thickener, binder thiab dej retainer rau cement mortar. Nws tuaj yeem txhim kho kev ua haujlwm, kev tsim kho kev ua haujlwm thiab kev sib koom ua ke ntawm mortar, thaum txo qhov shrinkage thiab tawg ntawm mortar.
3.2 Txheej kev lag luam
HPMC yog siv los ua cov thickener, dispersant thiab stabilizer hauv kev lag luam txheej. Nws tuaj yeem txhim kho cov khoom rheological ntawm txheej txheej, ua kom yooj yim rau txhuam, thiab txhim kho cov adhesion thiab flatness ntawm txheej.
3.3 Pharmaceutical and food industries
Hauv kev lag luam tshuaj, HPMC yog siv los ua cov khoom siv ua yeeb yaj kiab, cov neeg sawv cev tso tawm thiab stabilizer rau cov ntsiav tshuaj. Nws tuaj yeem tswj tau qhov tso tawm ntawm cov tshuaj thiab txhim kho kev ruaj ntseg ntawm cov tshuaj. Hauv kev lag luam khoom noj khoom haus, HPMC yog siv los ua ib qho ntxiv rau thicken, emulsify, ncua thiab stabilize zaub mov.
3.4 Kev lag luam tshuaj pleev ib ce
Hauv cov tshuaj pleev ib ce, HPMC yog siv los ua cov thickener, zaj duab xis qub thiab stabilizer. Nws tuaj yeem txhim kho kev ntxhib los mos thiab kev siv ntawm cov tshuaj pleev ib ce, thiab txhim kho kev ruaj ntseg thiab moisturizing cov khoom ntawm cov khoom.
4. Qhov zoo thiab qhov nyuaj
Raws li kev ua haujlwm ntau yam tshuaj, HPMC tau qhia txog qhov zoo ntawm daim ntawv thov hauv ntau yam kev lag luam. Ua ntej, nws yog muab los ntawm ntuj cellulose thiab muaj biocompatibility zoo thiab kev tiv thaiv ib puag ncig. Thib ob, HPMC muaj tshuaj lom neeg ruaj khov thiab tuaj yeem tswj hwm nws qhov kev ua tau zoo nyob rau hauv ib puag ncig sib txawv. Txawm li cas los xij, cov txheej txheem tsim khoom ntawm HPMC yog qhov nyuaj thiab muaj kev xav tau siab rau cov khoom siv thiab thev naus laus zis. Tsis tas li ntawd, qhov zoo sib xws thiab kev ua haujlwm ruaj khov ntawm cov khoom sib txawv ntawm cov khoom kuj yog cov teeb meem uas xav tau kev saib xyuas.
5. Kev Txhim Kho Yav Tom Ntej
Nrog rau kev nce qib ntawm kev tshawb fawb thiab thev naus laus zis thiab kev hloov pauv hauv kev xav tau ntawm kev lag luam, daim ntawv thov kev cia siab ntawm HPMC yuav dav dua. Hauv kev tsim kho, HPMC yuav ua lub luag haujlwm ntau dua hauv cov khoom siv hauv tsev tshiab thiab cov tsev ntsuab. Hauv kev lag luam tshuaj thiab zaub mov, HPMC yuav siv dav dua li cov qauv kev noj qab haus huv thiab kev nyab xeeb txhim kho. Tsis tas li ntawd, raws li tib neeg tau saib xyuas ntau dua rau kev tiv thaiv ib puag ncig thiab kev txhim kho kom ruaj khov, HPMC, raws li cov peev txheej txuas ntxiv mus, yuav qhia nws qhov zoo ntawm ib puag ncig hauv ntau thaj chaw.
Hydroxypropyl methylcellulose (HPMC) tau dhau los ua cov khoom siv tshuaj tseem ceeb hauv kev tsim khoom vim nws cov khoom tshwj xeeb thiab daim ntawv thov dav. Nyob rau hauv lub neej yav tom ntej, nrog kev nce qib ntawm cov thev naus laus zis thiab kev nthuav dav ntxiv ntawm daim ntawv thov kev lag luam, HPMC yuav ua lub luag haujlwm tseem ceeb hauv ntau thaj chaw, coj cov cib fim tshiab thiab cov nyom rau kev txhim kho ntawm ntau yam kev lag luam.
Post lub sij hawm: Lub Xya hli ntuj-31-2024