Qhov sib txawv ntawm HPMC thiab HEC

Ob leeg hydroxypropyl methylulose thiab hydroxyethyl cellulose yog cellulose, dab tsi yog qhov sib txawv ntawm ob?

"Qhov sib txawv ntawm HPMC thiab HEC"

01 HPMC thiab HEC
HydroxyPropyyl methylulose (hypromellose), tseem hu ua hypromellose, yog hom ntawm cov tsis-ionic cellulose sib xyaw ether. Nws yog semisynthetic, tsis voos, tus neeg siv roj pleev VOJ-POLYTORS siv tau raws li cov roj nplua nyeem hauv ophthalientmology, lossis raws li kev zam lossis lub tsheb kho mob.
Hydroxyethyl cellulose (HEC), Tshuaj Mis (C2h6o2) N, tsis muaj ntxhiab tsw qab los yog cov tshuaj tsw qab, tsis muaj ntxhiab tsw qab los yog cov tshuaj tsw qab, tsis muaj ntxhiab tsw qab (lossis chloroethanol) Nws tau npaj los ntawm etherification thiab belongs rau tsis- ionican soluble cellulose neeg hais txog. Vim tias HEC muaj cov yam ntxwv zoo ntawm thickening, kev sib cais, kev tiv thaiv thiab muab cov tshuaj tiv thaiv thiab khoom noj, ntawv thiab polymer polymnerization Thiab lwm thaj teb, 40 mesh sieving tus lej ≥ 99%.

02 qhov txawv
Txawm hais tias ob qho tib si yog cellulose, muaj ntau yam sib txawv ntawm ob:
HydroxyPropyyl methylulose thiab hydroxyethylcellulose sib txawv hauv cov khoom, siv, thiab solubility.

1. Cov yam ntxwv sib txawv
HydroxyPropyyl Metylcellulose: (HPMC) yog xim dawb lossis zoo sib xws dawb fiber ntau lossis cov hmoov nplej dawb lossis cov hmoov av uas tsis muaj kev nyab xeeb sib xyaw. Nws yog ib nrab hluavtaws tsis-nyob vosticastic polymer.
Hydroxyethylulose: (HEC) yog dawb lossis daj, tsw thiab tsis muaj fiber ntau lossis hmoov zoo. Nws yog Etetherified los ntawm kev qhia cellulose alkaline thiab ethylene oxide (lossis chlorohydrin). Nws yog rau cov tsis-ionic soluble cellulose ether.

2. Txawv solubility
HydroxyPropyyl Metylcellulose: yuav luag Insoluble nyob rau hauv abcute ethanol, ether thiab acetone. Ntshiab los yog me ntsis pos huab colloidal tov yaj hauv dej txias.
Hydroxyethyl cellulose: nws muaj cov khoom ntawm thickening, ncua, khi, emulsifying, dispersing thiab moisturizing. Nws tuaj yeem npaj cov kev daws teeb meem hauv viscosity sib txawv thiab muaj ntsev zoo rau electrolytes.
Hydroxypropy yog cov yam ntxwv ntawm cov khoom siv thickening, tsis muaj ntsev, ntau cov hmoov av tsis kam, dispersibility thiab cohesiveness.

Muaj ntau ntau qhov sib txawv ntawm ob, thiab lawv cov txiaj ntsig hauv kev lag luam kuj sib txawv.

HydroxyPropyyl methylulose feem ntau yog siv raws li cov tuab tuab, dispersant thiab stabilizer nyob rau hauv txheej kev lag luam lossis solubility nyob rau hauv dej lossis organic kuab tshuaj. Hauv kev tsim kho kev tsim kho, nws tuaj yeem siv hauv cov cement, yas putty, plaster, thiab lwm yam. Txhim kho cov yas thiab dej ceev ceev ntawm cug.
Hydroxyethyl cellulose muaj cov khoom ntawm thickening, kev ncua, khi, emulsifying, dispersing thiab moisturizing. Nws tuaj yeem npaj cov kev daws teeb meem hauv viscosity sib txawv thiab muaj ntsev zoo rau electrolytes. Hydroxyethyl cellulose yog qhov ua tau zoo zaj duab xis qub, sib txuas, cov plaub hau, cov plaub hau, neutralizers, me me thiab tshuaj pleev ib ce; Hauv kev ntxuav hmoov nyob hauv nruab nrab yog hom ntawm cov av redeposition tus neeg sawv cev. Hydroxyethyl cellulose yaj nrawm rau ntawm qhov kub thiab txias, uas tuaj yeem ceev cov txheej txheem ntau lawm thiab txhim kho ntau lawm. Qhov pom tseeb ntawm cov tshuaj ntxuav tes uas muaj hydroxyethyl cellulose yog tias nws tuaj yeem txhim kho lub smoothness thiab kev lom zem ntawm cov ntaub.