Hydroxypropyl methylcellulose (HPMC)yog ib qho cellulose ether uas tsis yog ionic siv dav hauv cov ntaub ntawv siv hauv kev tsim kho, tshuaj, khoom noj, tshuaj pleev ib ce thiab lwm yam kev lag luam. Nws muaj ntau yam khoom zoo heev, uas ua rau nws ua tau zoo hauv ntau yam kev siv.
1. Qhov tsos thiab solubility
HPMC feem ntau yog hmoov dawb lossis dawb tawm, tsis muaj ntxhiab, tsis qab thiab tsis muaj tshuaj lom. Nws tuaj yeem yaj rau hauv dej txias thiab qee cov kuab tshuaj organic (xws li cov kuab tshuaj sib xyaw xws li ethanol / dej thiab acetone / dej), tab sis nws tsis yaj rau hauv ethanol ntshiab, ether thiab chloroform. Vim nws tsis yog ionic, nws yuav tsis dhau electrolytic reaction hauv aqueous kua thiab yuav tsis cuam tshuam los ntawm pH tus nqi.
2. Viscosity thiab rheology
Cov kua dej HPMC muaj cov thickening zoo thiab thixotropy. Ntau hom AnxinCel®HPMC muaj cov viscosities sib txawv, thiab qhov ntau thiab tsawg yog 5 txog 100000 mPa·s (2% kua dej, 20°C). Nws cov kua muaj pseudoplasticity, uas yog, shear thinning phenomenon, thiab nws tsim nyog rau cov xwm txheej siv xws li coatings, slurries, adhesives, thiab lwm yam uas xav tau rheology zoo.
3. Kev ua kom sov sov
Thaum HPMC raug cua sov hauv dej, qhov pob tshab ntawm cov tshuaj txo qis thiab gel raug tsim ntawm qee qhov kub. Tom qab txias, lub xeev gel yuav rov qab mus rau lub xeev tshuaj. Ntau hom HPMC muaj qhov kub gel sib txawv, feem ntau ntawm 50 thiab 75 ° C. Cov khoom no yog qhov tseem ceeb tshwj xeeb hauv kev siv xws li kev tsim cov tshuaj mortar thiab cov tshuaj ntsiav tshuaj.
4. Kev ua haujlwm ntawm qhov chaw
Vim tias HPMC molecules muaj cov pab pawg hydrophilic thiab hydrophobic, lawv qhia txog qee yam kev ua haujlwm ntawm qhov chaw thiab tuaj yeem ua lub luag haujlwm emulsifying, dispersing thiab stabilizing. Piv txwv li, hauv coatings thiab emulsions, HPMC tuaj yeem txhim kho qhov ruaj khov ntawm emulsion thiab tiv thaiv kev tso cov xim pigment.
5. Kev ntub dej
HPMC muaj qee qhov hygroscopicity thiab tuaj yeem nqus cov dej noo hauv qhov chaw noo noo. Yog li ntawd, hauv qee qhov kev siv, yuav tsum tau them sai sai rau kev ntim khoom kom tiv thaiv kev nqus dej noo thiab kev sib sau ua ke.
6. Cov khoom ua yeeb yaj kiab
HPMC tuaj yeem tsim ib zaj duab xis tawv thiab pob tshab, uas yog siv dav hauv cov khoom noj, tshuaj (xws li cov neeg sawv cev txheej) thiab cov txheej txheej. Piv txwv li, hauv kev lag luam tshuaj, zaj duab xis HPMC tuaj yeem siv ua txheej txheej ntsiav tshuaj los txhim kho kev ruaj khov ntawm cov tshuaj thiab tswj kev tso tawm.
7. Kev sib haum xeeb thiab kev nyab xeeb
HPMC tsis muaj tshuaj lom thiab tsis ua rau mob, thiab tib neeg lub cev tuaj yeem zom tau yam tsis muaj kev phom sij, yog li nws siv dav hauv kev kho mob thiab zaub mov. Ua ib qho tshuaj ntxiv, feem ntau nws yog siv los tsim cov ntsiav tshuaj uas tso tawm tas mus li, cov plhaub tshuaj ntsiav, thiab lwm yam.
8. pH ruaj khov ntawm cov kua
HPMC ruaj khov nyob rau hauv pH ntau ntawm 3 txog 11, thiab tsis yooj yim puas tsuaj lossis precipitated los ntawm acid thiab alkali, yog li nws tuaj yeem siv rau hauv ntau yam tshuaj lom neeg, xws li cov ntaub ntawv tsim kho, cov khoom siv tshuaj txhua hnub thiab cov tshuaj tsim tshuaj.
9. Tsis kam ntsev
Cov tshuaj HPMC ruaj khov rau cov ntsev inorganic thiab tsis yooj yim precipitated lossis tsis ua haujlwm vim muaj kev hloov pauv ntawm cov ion concentration, uas ua rau nws tswj tau qhov kev ua tau zoo hauv qee lub tshuab muaj ntsev (xws li cov cement mortar).
10. Kev ruaj khov ntawm cua sov
AnxinCel®HPMC muaj kev ruaj khov zoo nyob rau hauv qhov chaw kub siab, tab sis nws yuav lwj lossis hloov xim thaum raug rau qhov kub siab ntev. Nws tseem tuaj yeem ua tau zoo hauv qee qhov kub (feem ntau qis dua 200 ° C), yog li nws tsim nyog rau kev siv ua haujlwm kub siab.
11. Kev ruaj khov tshuaj lom neeg
HPMCNws ruaj khov rau lub teeb, cov tshuaj oxidants thiab cov tshuaj lom neeg feem ntau, thiab tsis yooj yim cuam tshuam los ntawm cov tshuaj lom neeg sab nraud. Yog li ntawd, nws tuaj yeem siv rau hauv cov khoom uas xav tau kev khaws cia ntev, xws li cov ntaub ntawv tsim kho thiab tshuaj.
Hydroxypropyl methylcellulose siv dav hauv ntau yam lag luam vim nws cov solubility zoo heev, thickening, thermal gelation, zaj duab xis-tsim cov khoom thiab tshuaj stability. Hauv kev lag luam kev tsim kho, nws tuaj yeem siv ua cov cement mortar thickener; hauv kev lag luam tshuaj, nws tuaj yeem siv ua cov tshuaj excipient; hauv kev lag luam zaub mov, nws yog cov khoom noj khoom haus additive. Nws yog cov yam ntxwv tshwj xeeb no uas ua rau HPMC ua cov khoom siv polymer tseem ceeb.
Lub sijhawm tshaj tawm: Lub Ob Hlis-10-2025