HydroxyPropyl methylcellose HPMC feem ntau siv rau hauv kev tsim cov khoom sab hauv thiab sab nrauv, hauv cov khoom lag luam zoo nkauj, thiab lwm yam tshwj xeeb thiab lwm yam tshwj xeeb thiab lwm yam tshwj xeeb thiab lwm yam tshwj xeeb thiab lwm yam tshwj xeeb Viscosity cellulose, cov khoom no muaj cov dej khov ua haujlwm zoo, cov nyhuv tuab tuab tuab thiab ruaj khov. HPMC tau dav siv nyob rau hauv lub tsev kev lag luam thiab siv nyob rau hauv ib tus nqi loj. Cellulose tuaj yeem siv los ua tus retarder, dej tswjfwm tus neeg saib xyuas, thickener thiab phau ntawv. Cellulose ua lub luag haujlwm tseem ceeb hauv kev sib xyaw ua ke, cov hmoov av nyias nyias
Feem ntau siv cov neeg muaj kev pab cuam cellulose xws li HEC, HPMC, CMC, MHEC, thiab lwm yam. HPMC, MC lossis EHEC tau siv nyob rau hauv feem ntau cov cement lossis gypsum-beel, cleatly txhim kho cov nplaum ntawm cov nplaum, thiab lwm yam. HEC yog siv hauv cov cement, tsis tsuas yog ua retarder, tab sis kuj yog dej-retaining tus neeg sawv cev, thiab HEHPC kuj tau siv nyob rau hauv no. MC lossis HEC feem ntau siv ua ke nrog CMC ua ib qho khoom siv ntawm cov ntawv ntsa. Nruab nrab-viscosity los yog high-viscosity cellulos muaj kev hais ua ke yog ib txwm siv nyob rau hauv cov ntaub ntawv vaj glued tsev.
Cov yam ntxwv ntawm hydroxypropyl methylcellose
HydroxyPropyl methylcellose HPMC cov khoom ua ke ntau lub cev thiab tshuaj lom neeg los ua cov khoom lag luam tshwj xeeb nrog ntau yam kev siv. Cov ntau yam muaj raws li nram no:
(1) Kev tuav dej: nws tuaj yeem tuav dej ntawm cov chaw ntxeem tau xws li Pob Zeb Cemas thiab Cib.
(2) zaj duab xis tsim: nws tuaj yeem tsim lub pob tshab, tawv thiab muag ua zaj duab xis nrog cov roj ua tsis tau zoo.
(3) Cov organic solubility: cov khoom yog soluble hauv qee cov kuab tshuaj organic, xws li ethanol / dej, dichlent system muaj ntawm ob tus organic kuab tshuaj.
(4) thermal gelation: thaum cov tshuaj aqueous ntawm cov khoom lag luam yog rhuab, nws yuav tsim cov gel yuav dhau los ua kev daws teeb meem dua tom qab txias.
(5) Cov kev ua si saum npoo av: Muab cov kev ua kom zoo rau kev daws teeb meem emulsification thiab tiv thaiv kev tiv thaiv kev ruaj khov, nrog rau theem ruaj khov.
(6) Kev Kawm: HydroxyPropyyl Metylcellulose tuaj yeem tiv thaiv cov khoom muaj los ntawm kev tsim tawm, yog li inhibermiting tsim los ntawm precipitates.
(7) Kev Tiv Thaiv Kev Tiv Thaiv: Nws tuaj yeem tiv thaiv cov tee dej thiab cov lus ntawm co coescing lossis coagulating.
(8) Adhesiveness: Siv ua cov nplaum rau cov pigments, luam yeeb cov khoom lag luam, thiab cov khoom lag luam, nws muaj kev ua tau zoo heev.
(9) Dej Solubility: Cov khoom tuaj yeem tawm hauv dej hauv ntau qhov ntau, thiab nws qhov siab tshaj plaws tsuas yog txwv los ntawm viscosity.
(10) Tsis-ionic inertness: cov khoom yog cov khoom tsis-ionic cellulose ether, uas tsis sib xyaw nrog cov kav hlau los lossis lwm yam ions los ua insoluble precipitates.
(11) acid-luj ruaj ruaj: haum rau siv nyob rau hauv ntau li ntawm PH3.0-11.0.
(12) tasteless thiab tsis muaj ntxhiab, tsis cuam tshuam los ntawm cov metabolism; Siv los ua cov khoom noj thiab yeeb tshuaj ntxiv, lawv yuav tsis yog metabolized hauv cov zaub mov thiab yuav tsis muab calories.
Cov kev sib txuam thiab cov kev qhia yooj yim los txheeb xyuas qhov zoo
1. Ntshiab HPMC yog visually fluffy thiab muaj qhov tsawg bulk ntom ntom, xws li 0.3-0.4g / ml; Adulterated HPMC muaj cov fluidity zoo dua thiab muaj qhov hnyav dua, uas yog obviously sib txawv ntawm cov khoom muaj tseeb hauv tsos.
2. Ntshiab HPMC muaj qhov zoo dawb, uas txhais tau tias cov ntaub ntawv raw siv rau hauv kev tsim khoom yog cov ntshiab, thiab cov tshuaj tiv thaiv yog cov tshuaj tiv thaiv ntau yam tsis muaj kev cuam tshuam. Piv nrog cov khoom siv txawv teb chaws ether, nws tuaj yeem pom tau tias cov khoom dawb ntawm cov khoom lag luam zoo tshaj li ntawm cov khoom lag luam hauv tsev.
3. Ntshiab HPMC aqueous yog tseeb, muaj teeb meem kev hloov pauv, dej khaws nyiaj khaws cia ≥ 97%; Adulterated HPMC aqueous daws yog turkid, thiab cov dej khaws cia yog qhov nyuaj kom tau raws li qhov yuav tsum tau ua. Lub teeb kev pauv hloov pauv ntawm cov kua aqueous yog qhov zoo, uas qhia tias cov khoom muaj cov tshuaj tsis muaj insoluble thiab muaj cov ntsiab lus ntawm cov khoom xyaw nquag.
4. Ntshiab HPMC yuav tsum tsis hnov ntxhiab ammonia, cov hmoov txhuv nplej siab thiab dej cawv; Adulterated HPMC feem ntau hnov tsw tau txhua yam tsw ntxhiab tsw, txawm tias nws tsis muaj ntxhiab, nws yuav hnov hnyav.
5. Ntshiab HPMC hmoov yog fibrous nyob rau hauv lub tshuab tsom lossis lub iav loj; Adulterated HPMC tuaj yeem pom tias yog cov khib nyiab los yog muaju hauv qab lub tshuab tsom lossis lub khob loj dua.
6. Txoj kev ntsuas sim yooj yim rau cov hmoov tshauv ntawm cov pob cellulose ether yog hnyav dua, thiab ntsuas cov hmoov tshauv sab laug tom qab lub cellulose ether yog hlawv. Thaum cov tshauv Residue / Cellulose ethiste ≥ 5%, siv tau cov khoom tau zoo ntawm cov tiaj ether yog qhov tsis tsim nyog. (Qee zaum muaj qhov yuam kev nyob rau hauv hom no. Ib qho yog tias cov chaw tsim khoom tau ntxiv cov khoom siv tshwj xeeb tom qab tawm cov hmoov av lossis cov khoom siv tshauv tsis muaj roj hmab thaum adulterating)
7. Qee qhov chaw tsim khoom sib xyaw ua ke me me ntawm cmc rau hauv hydroxypropyl ntawm cov tshuaj, txhuas, tooj thiab qee cov tshuaj tiv thaiv dej nag, ib qho dej nag, ib qho dej nag, ib qho dej nag, ib qho hnyav, kev xav tsis thoob? CMC aqueous daws thiab calcium thaum, magnesium, thiab ntsev kav, tsis muaj nag lossis daus yuav raug txo kom tsawg.
8. Yog tias qhov mob tso cai, kuaj xyuas cov tshuaj tua kab mob ethoous ether thiab sib piv cov dej khaws cia ntawm cov cellulose tsawg ether.
Lub Sijhawm Post: Feb-14-2025