(Methyl chloride) (MC) Cov Qauv Molecular Molecular \ [C6h7o2 (Oh) 3-H (OCH3) N1] X 1-Methyl Chloride yog siv los ua Otherification Tus Neeg Sawv Cev. Tom qab cov kev tawm tsam ntau, cellulose ether yog nqa tawm. Feem ntau, cov qib degree hloov tau yog 1.6 ~ 2.0, thiab qib hloov pauv yog qhov txawv. Nws zwm rau cov tsis muaj ionic cellulose ether.
1. Methylcellulose yog soluble hauv dej txias, dej kub yuav ntsib cov teeb meem, thiab photes photes yog ruaj khov ntawm 3/12. Cov hmoov txhuv nplej siab, cov duab ntawm cov tsiaj txhuv nplej thiab ntau lwm cov surfactants ntau dua. Ntau. Gelation tshwm sim thaum qhov kub nce mus txog qhov gelation kub.
Cov dej rov qab ntawm methylcellulose nyob ntawm nws cov nyiaj ntxiv, viscosity, particle zoo heev thiab cuam tshuam tus nqi. Feem ntau loj, me me, siab viscosity, cov dej siab khaws cia. Ntawm lawv, cov dej khaws cia muaj qhov cuam tshuam zoo tshaj plaws, thiab qib viscosity tsis ncaj qha rau cov dej tuav tseg. Tus lej sib cais feem ntau yog nyob ntawm cov kev hloov kho ntawm qhov chaw ntawm cov cellulose ntawm lub cellulose sau thiab lub txiaj ntsig ntawm cov hais. Ntawm cov neeg ua haujlwm ntawm cellulose saum toj no, methyl cellulose thiab hydroxypropyl methyl cellulose muaj cov dej siab khaws cia.
Kev hloov qhov kub hloov tuaj yeem cuam tshuam rau cov dej tuav tseg ntawm methyl cellulose. - 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.
Methylcellulose muaj qhov cuam tshuam tseem ceeb ntawm kev ua haujlwm thiab cov nplaum ntawm cug. Qhov "nplaum" yog hais txog cov nplaum ntawm tus neeg ua haujlwm cov cuab tam thiab lub phab ntsa substrate, uas yog, cov shear tiv thaiv ntawm lub cug. Viscosity, cug shear shear zog, thiab lub zog uas yuav tsum tau los ntawm cov neeg ua haujlwm hauv kev siv kuj yog loj heev, thiab tshuaj tshuaj kho tsis zoo. Methylcellulose adhered nyob rau theem nrab hauv cellulose khoom siv ether.
2. HydroxyPropyylencellulose (HPMC) [C 6 h 7-mn) 3) MN (OCH) MIN (OCH) MIN (OCH) MEXTYURSE HAUV XYOO LENYIM Nws yog ib qho tsis muaj ionic cellulose tau npaj los ntawm cov paj rwb alkali, nyob rau hauv uas prosylene oxide thiab methyl chloride yog siv los ntawm etherification tus sawv cev. Cov degree ntawm kev hloov pauv yog feem ntau 1.2 / 2.0. Nws cov khoom sib txawv sib txawv raws li qhov sib piv ntawm methoxyl cov ntsiab lus thiab hydroxypropropyl cov ntsiab lus.
1. HydroxyPropyyl methylculose tau muab faib ua cov hom kub-yaj thiab hom tseem ceeb. Nws cov gelation kub hauv dej kub yog qhov siab dua li ntawm methylcellulose. Nws tseem qhia tau zoo dua kev txhim kho li methylcellulose thaum yaj hauv dej txias.
Lub viscosity ntawm hydroxypropyyl methylcellulose yog hais txog cov molecular hnyav, thiab lub cev molecular yog qhov siab. Qhov kub kuj cuam tshuam rau nws cov viscosity, raws li kub nce ntxiv, viscosity txo. Txawm li cas los xij, tus cawv ntawm qhov kub ntawm viscosity yog qis dua li methyl cellulose. Qhov kev daws teeb meem yog chaw cia nyob hauv chav tsev kub.
3. Cov dej tuav ntawm hydroxypropylulose nyob ntawm nws cov nyiaj ntxiv, thiab cov dej khaws cov nyiaj ib yam li ntawm methyl cellulose.
4. HydroxyPropylulose yog ruaj khov rau kua qaub thiab alkali, thiab nws cov kua aqueous yog qhov ruaj khov nyob rau hauv cov PHOT ntawm 2/12. Cov kev ua tau zoo ntawm caustic dej qab zib thiab kua qaub tsis muaj ntau yam cuam tshuam, tab sis cov alkali tuaj yeem nrawm nws qhov kev cais tawm, thiab viscosity yog nce. HydroxyPropyyl methylulose yog ruaj khov rau cov ntsev uas zoo, tab sis thaum cov ntsev daws yog qhov siab, lub viscosposyl methylulose kev daws teeb meem.
HydroxyPropy muag methylcellulose tuaj yeem sib xyaw nrog cov dej-soluble polymers los ua cov khaub ncaws zoo nkauj, muaj kev sib xyaw ua ke. Xws li cov dej cawv polyvinyl, cov hmoov txhuv nplej siab ether, zaub cov pos hniav, thiab lwm yam.
HydroxyPropyyl methylulose tau zoo dua enzyme tiv thaiv dua li methylcellulose, thiab cov nplaum ntawm cov methylycellulose rau cug kev tsim kho yog siab tshaj li methylcellulose. Cellulose puag.
Peb, Hydroxyethyl cellulose (HEC) yog tsim los ntawm cov paj rwb refined kho nrog alkali, nyob rau hauv muaj acetone, thiab ethylene oxide yog etherification tus neeg sawv cev. 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. Cov kev daws teeb meem yog ruaj khov ntawm qhov kub thiab txias thiab tsis muaj gel khoom. Nws tuaj yeem siv rau lub sijhawm ntev nyob rau hauv cov tshuaj khib siab-kub, tab sis nws cov dej khaws cia yog qis dua li methyl cellulose.
2. Hydroxyethyl cellulose yog qhov ruaj khov rau dav dav acid thiab alkali. Alkali tsuj nws cov kev sib cais, thiab nws viscosity nce me ntsis. Nws tawg hauv dej yog me ntsis phem dua li methyl cellulose thiab hydroxypropyl methylropy cellulose.
3. Hydroxyethyl cellulose muaj kev ua yeeb yam zoo ntawm cellulose tau ua rau nws cov dej me me thiab cov ntsiab lus zoo nkauj thiab cov ntsiab lus tshauv.
4. Carboxymethyl cellulose (CMC) \ [C6h7o2 (Oh) 200coling, thiab lwm yam ntawm cov tshuaj tiv thaiv kab mob, nws yog tsim rau cov ionic cellulose ether. Cov degree ntawm cov neeg hloov chaw yog feem ntau 0.4 / 1.4, thiab qib hloov pauv tau muaj ntau dua rau kev ua tau zoo.
Carboxymethyl cellulose muaj hygroscopicity siab, thiab cov kev cia khoom hauv dav dav muaj ntau cov dej.
2. Carboxymethyl cellulose aqueous kua aqueous kua aqueous kua autre, thiab lub viscosity lig, thiab lub viscosity yog ircosity yog ircosity thaum kub tshaj 50 ° C.
Nws cov ruaj khov yog cuam tshuam ntau heev los ntawm Ph. Feem ntau siv rau gypsum tshuaj khib, tsis yog rau cugasch cug. Nyob rau hauv cov ntaub ntawv ntawm siab alkalinity, nws yuav poob nws viscosity.
Nws cov dej khaws cia yog qhov qis dua ntawm methyl cellulose. Gypsum tshuaj khib muaj cov nyhuv retarding, txo lub zog. Tab sis tus nqi ntawm Carboxymethyl cellulose yog qhov qis dua li ntawm methyl cellulose.
Lub Sijhawm Post: Feb-14-2025