1. Methylcellulose (MC)
Tom qab lub r rwb rwb yog kho nrog alkali, cellulose ether yog tsim los ntawm cov kev tawm tsam nrog methane chloride li etherification tus neeg sawv cev. Feem ntau, cov qib degree hloov tau yog 1.6 ~ 2.0, thiab solubility kuj txawv degrees ntawm kev hloov pauv sib txawv. Nws zwm rau cov tsis muaj ionic cellulose ether.
(1) Methylcellulose yog soluble hauv dej txias, thiab nws yuav nyuaj rau yaj hauv dej kub. Nws cov kev daws teeb meem aqueous yog ruaj khov nyob rau hauv cov xov tooj ntawm PH = 3 ~ 12. Nws muaj qhov sib xyaw zoo nrog cov hmoov txhuv nplej siab, cov pos hniav guar, thiab lwm yam thiab ntau surfactants. Thaum qhov ntsuas kub nce mus txog qhov gelation kub, gelation tshwm sim.
(2) Cov dej tuav tseg ntawm methyl cellulose yog nyob ntawm nws cov nyiaj ntxiv, viscosity, particle txaus thiab ua kom kawg. Feem ntau, yog tias qhov nyiaj ntxiv yog qhov loj, lub fineness yog me me, thiab viscosity yog qhov loj, dej khaws cia siab dua yog siab. Ntawm lawv, tus nqi ntawm kev ntxiv yog qhov cuam tshuam loj tshaj plaws rau cov dej khaws nyiaj khaws cia, thiab theem viscosity tsis ncaj qha rau cov qib dej khaws nyiaj khaws cia. Qhov kev sib cais feem ntau yog nyob ntawm cov qib ntawm kev hloov kho saum npoo ntawm cov cellulose thiab particle txaus. Ntawm cov kev ua haujlwm ntawm cellulose saum toj no, methyl cellulose thiab hydroxypropyl cellulose muaj cov dej rov qab ua haujlwm dua.
(3) Kev hloov pauv qhov kub yuav cuam tshuam rau cov dej tuav ntawm tus nqi methyl ntawm methyl polulose. Feem ntau, qhov ntsuas kub siab dua, qhov tsis zoo ntawm cov dej khaws cia. Yog tias cug cug Kub tshaj 40 ° C, cov dej tuav tseg ntawm methyl cellulose yuav raug txo qis, muaj feem xyuam rau kev tsim kho ntawm lub tshuaj khib.
(4) Methyl cellulose muaj qhov cuam tshuam tseem ceeb ntawm kev tsim kho thiab nplaum ntawm cug. Qhov "adhesion" ntawm no yog hais txog lub zog nplaum tau hnov ntawm tus neeg ua haujlwm cov cuab tam thiab phab ntsa substrate, uas yog, cov shear tiv thaiv ntawm lub cug. Cov nplaum yog qhov siab, cov shear tiv thaiv ntawm cov neeg ua haujlwm yog loj, thiab lub zog ntawm cov neeg ua haujlwm ntawm cov txheej txheem yog loj, thiab kev tsim kho ntawm lub tshuaj khib yog neeg pluag. Methyl cellulose adhesion yog nyob rau theem qib hauv cellulose ether.
2. Hydroxypropyloosylcelylulose (HPMC)
HydroxyPropyyl methylulose yog lub cellulose ntau nws cov zis thiab noj tau nce zuj zus nyob rau hauv xyoo tas los no. 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 vim qhov sib piv sib txawv ntawm methoxyl cov ntsiab lus thiab hydroxypropropsyl 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) Lub viscosity ntawm hydroxypropyf methylcellulose muaj feem xyuam rau nws cov molecular hnyav, thiab qhov loj dua cov molecular hnyav, ntau dua viscosity. Qhov kub kuj cuam tshuam rau nws cov viscosity, raws li kub nce ntxiv, viscosity txo. Txawm li cas los xij, nws cov viscosity siab muaj qhov kub tsawg dua li 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 kua qaub muaj cov nyhuv me me rau nws cov kev ua tau zoo, tab sis alkali tuaj yeem ua rau nws cov kev sib cais thiab nce siab txog nws 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 polymer sib txuas ua ke los ua cov khaub ncaws hnav thiab siab dua homphosity. 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. Cov nplaum ntawm hydroxypropyl methylcellulose rau tshuaj cug kev tsim kho yog siab tshaj li methylcellulose.
3. Hydroxyethyl cellulose (HEC)
Nws yog tsim los ntawm cov paj rwb reched kho nrog alkali, thiab siv nrog ethylene oxide raws li etherification tus neeg sawv cev hauv lub xub ntiag ntawm acetone. Qib kawm ntawv hloov chaw 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 cellulose yog ruaj khov rau dav dav acid thiab alkali. Alkali tuaj yeem nrawm nws qhov kev sib cais thiab ua kom nce me ntsis nws viscosity. Nws qhov kev tsis txaus ntseeg hauv dej yog ib qho tsis zoo me ntsis dua li methyl cellulose thiab hydroxypropyl methyl cellulose. Cov.
(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.
4. Carboxymethyl cellulose (CMC)
Ionic cellulose ether yog tsim los ntawm ntuj fibers (paj rwb, thiab lwm yam) kho nrog alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali thiab siv los ntawm Alkali Cov degree ntawm kev hloov pauv yog feem ntau 0.4 ~ 1.4, thiab nws cov kev ua tau zoo tau cuam tshuam los ntawm kev kawm qib siab.
(1) Carboxymethyl cellulose yog hygroscopic, thiab nws yuav muaj ntau cov dej ntxiv thaum khaws cia nyob rau hauv cov xwm txheej dav dav.
(2) Carboxymethyl cellulose aqueous kua aqueous yuav tsis tsim gel, thiab lub viscosity yuav poob nrog qhov ntsuas kub. Thaum qhov kub tshaj 50 ° C, lub viscosity yog irreversible.
(3) Nws cov ruaj khov yog cuam tshuam ntau heev los ntawm Ph. Feem ntau, nws tuaj yeem siv rau hauv gypsum-raws cug, tab sis tsis nyob rau hauv cov cement-raws cug. Thaum alkaline heev, nws loses viscosity.
(4) Nws cov dej khaws cia yog qhov qis dua ntawm methyl cellulose. Nws muaj cov nyhuv retarding rau gypsum-raws li coll thiab txo nws lub zog. Txawm li cas los xij, tus nqi ntawm carboxymethyl cellulose yog qis dua li ntawm methyl cellulose
Lub Sijhawm Post: Jan-10-2023