1.hdroxypropyth cellulose
HydroxyPropyyl Methylcelluloseyog cov cellulose ntau yam uas nws cov zis thiab kev noj tau nce zuj zus. Nws yog ib qho tsis-ionic cellulose sib xyaw ither ua los ntawm cov paj rwb tom qab kev sib dhos thiab methylene oxide thiab methyl chloride, los ntawm kev sib tw ntawm kev sib tw. Qib degree hloov chaw yog feem ntau 1.2 ~ 2.0. Nws cov khoom sib txawv nyob ntawm qhov sib piv ntawm methoxyl cov ntsiab lus rau hydroxypropyl cov ntsiab lus.
(1) HydroxyPropropy yog methylcellulose yog yooj yim soluble hauv dej txias, thiab nws yuav ntsib teeb meem hauv cov dej kub. Tab sis nws gelation kub hauv dej kub yog qhov siab dua li ntawm methyl cellulose. Lub solubility hauv dej txias kuj tseem txhim kho piv nrog methyl cellulose.
(2) (2) Lub viscosity ntawm hydroxypropylencellulose muaj feem xyuam rau nws cov molecular hnyav, thiab qhov loj dua cov viscosity. Qhov kub kuj cuam tshuam rau nws cov viscosity, raws li kub nce ntxiv, viscosity txo. Txawm li cas los xij, tus cawv ntawm nws cov siab viscosity thiab kub yog qis dua ntawm methyl cellulose. Nws cov kev daws teeb meem yog ruaj khov thaum khaws cia ntawm chav tsev kub.
(3) Cov dej ua kom muaj zog ntawm hydroxypropylulose nyob ntawm nws tus nqi ntxiv, thiab nws cov dej khaws cia nyob rau hauv tib tus nqi yog siab dua li ntawm methyl cellulose.
(4) HydroxyPropyyl methylulose yog ruaj khov rau kua qaub thiab alkali, thiab nws cov kua aqueous yog qhov ruaj khov heev hauv cov ph = 2 ~ 12. Caustic Dej qab zib thiab txiv qaub dej muaj cov nyhuv me me rau nws cov kev ua tau zoo, tab sis alkali tuaj yeem ua rau nws qhov kev sib cais thiab nce me ntsis nws qhov viscosity. HydroxyPropyyl methylulose yog ruaj khov rau cov ntsev ua kom zoo, tab sis thaum lub hom phiaj ntawm hydroxypropen methylropylulose kev daws teeb meem.
(5) HydroxyPropropy metylcellulose tuaj yeem sib xyaw nrog cov dej-soluble polymers los ua homogeneous, siab dua-viscosity daws. Xws li cov dej cawv polyvinyl, cov hmoov txhuv nplej siab ether, zaub cov pos hniav, thiab lwm yam.
(6) HydroxyPropyyl methylcelulose muaj cov enzyme tsis tshua zoo dua li methylcellose, thiab nws cov kev daws teeb meem tsis tshua muaj kev cuam tshuam los ntawm cov enzymes dua methylculose.
(7) cov nplaum ntawm hydroxypropyl methylcellulose rau tshuaj tshuaj kho yog siab tshaj li methylcellulose.
2. Hydroxyethyl cellulose
Nws yog tsim los ntawm cov paj rwb refined kho nrog alkali, thiab siv nrog ethylene oxide raws li etherification tus neeg sawv cev hauv lub xub ntiag ntawm isopropanol. Nws cov qib ntawm kev hloov pauv yog feem ntau 1.5 ~ 2.0. Nws muaj muaj zog hydrophilicity thiab yog yooj yim los nqus dej noo.
(1) Hydroxyethyl cellulose yog soluble hauv dej txias, tab sis nws yog qhov nyuaj rau yaj hauv dej kub. Nws cov kev daws teeb meem yog ruaj khov ntawm qhov kub siab tsis muaj kev sib cav. Nws tuaj yeem siv tau ntev nyob rau hauv lub siab ntev nyob rau hauv cov tshuaj khib, tab sis nws cov dej khaws cia yog qis dua ntawm methyl cellulose.
(2)Hydroxyethyl celluloseyog ruaj khov rau General acid thiab alkali, thiab alkali tuaj yeem nrawm nws cov kev sib cais thiab nce me ntsis nws cov viscosity. Nws qhov kev tsis txaus ntseeg hauv dej yog ib qho tsis zoo me ntsis dua li methyl cellulose thiab hydroxypropyl methyl cellulose.
(3) hydroxyethyl cellulose muaj qhov zoo anti-sag kev ua haujlwm rau tshuaj khib, tab sis nws muaj sijhawm retarding ntev dua rau cov cement.
(4) Kev ua yeeb yam ntawm hydroxyethyl cellulose cellulose tau ua los ntawm qee cov lag luam hauv tsev nyob yog qhov qis dua ntawm methyl cellulose vim nws cov ntsiab lus hauv dej siab thiab cov ntsiab lus tshauv.
(5) Lub mildew ntawm cov tshuaj aquoxysethyl cellulose yog loj dua. Ntawm qhov kub txog li 40 ° C, Mildew tuaj yeem tshwm sim tsis pub dhau 3 txog 5 hnub, uas yuav cuam tshuam nws qhov kev ua tau zoo.
Lub Sijhawm Post: Apr-28-2024