Hydroxyethyl cellulose npaj li cas?

Hydroxyethyl celluloseyog ib qho tseem ceeb ntawm cellulose derivative. Vim muaj qhov zoo ntawm cov khoom siv raw khoom, txuas ntxiv dua tshiab, biodegradable, tsis muaj tshuaj lom, biocompatibility zoo, thiab cov txiaj ntsig loj, nws cov kev tshawb fawb thiab kev siv tau nyiam ntau yam. . Viscosity tus nqi yog ib qho tseem ceeb heev Performance index ntawm hydroxyethyl cellulose. Nyob rau hauv daim ntawv no, hydroxyethyl cellulose nrog viscosity tus nqi siab tshaj 5 × 104mPa·s thiab tshauv nqi tsawg tshaj li 0.3% yog npaj los ntawm cov kua-theem synthesis txoj kev los ntawm alkalization thiab etherification ob-kauj ruam txheej txheem.

Cov txheej txheem alkalization yog txheej txheem npaj ntawm alkali cellulose. Hauv daim ntawv no, ob txoj kev alkalization yog siv. Thawj txoj kev yog siv acetone ua ib qho diluent. Cov khoom siv cellulose yog ncaj qha nyob rau hauv ib qho concentration ntawm sodium hydroxide aqueous kua. Tom qab cov tshuaj tiv thaiv basification tau ua tiav, tus neeg sawv cev etherifying yog ntxiv rau ncaj qha ua cov tshuaj tiv thaiv etherification. Qhov thib ob txoj kev yog tias cov khoom siv cellulose yog alkalized nyob rau hauv ib qho aqueous tov ntawm sodium hydroxide thiab urea, thiab alkali cellulose npaj los ntawm txoj kev no yuav tsum tau nyem kom tshem tawm ntau tshaj lye ua ntej cov tshuaj tiv thaiv etherification. Cov alkali cellulose npaj los ntawm ntau txoj kev tau soj ntsuam los ntawm infrared spectroscopy thiab X-ray diffraction. Raws li cov khoom ntawm cov khoom npaj los ntawm cov tshuaj tiv thaiv etherification, txoj kev xaiv tau txiav txim siab.

Txhawm rau txiav txim siab qhov zoo tshaj plaws etherification synthesis txheej txheem, cov tshuaj tiv thaiv mechanism ntawm antioxidant, lye thiab glacial acetic acid nyob rau hauv cov tshuaj tiv thaiv etherification tau soj ntsuam ua ntej. Tom qab ntawd tsim cov kev sim ntawm cov tshuaj tiv thaiv ib leeg, txiav txim siab cov yam ntxwv uas muaj kev cuam tshuam ntau dua ntawm kev ua haujlwm ntawm hydroxyethyl cellulose npaj, thiab siv cov viscosity ntawm cov khoom 2% aqueous tov raws li kev ntsuas ntsuas. Cov txiaj ntsig kev sim qhia tau hais tias cov yam ntxwv xws li xaiv cov tshuaj diluent, tus nqi ntawm ethylene oxide ntxiv, lub sij hawm alkalization, qhov kub thiab txias thiab lub sij hawm ntawm thawj cov tshuaj tiv thaiv, qhov kub thiab lub sij hawm ntawm qhov thib ob cov tshuaj tiv thaiv tag nrho muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm cov khoom. Ib qho kev sim orthogonal txoj kev sim nrog xya yam thiab peb theem tau kos, thiab cov txiaj ntsig nkhaus uas tau los ntawm cov txiaj ntsig kev sim tuaj yeem tsom xam qhov tseem ceeb thiab theem nrab thiab qhov cuam tshuam ntawm txhua yam. Txhawm rau npaj cov khoom lag luam nrog cov txiaj ntsig viscosity siab dua, cov txheej txheem kev sim ua kom zoo tau tsim, thiab cov tswv yim zoo rau kev npaj hydroxyethyl cellulose thaum kawg txiav txim siab los ntawm kev sim cov txiaj ntsig.

Cov khoom ntawm cov npaj high-viscosityhydroxyethyl cellulosetau soj ntsuam thiab kuaj, suav nrog kev txiav txim siab ntawm viscosity, cov ntsiab lus tshauv, lub teeb xa tawm, cov ntsiab lus noo noo, thiab lwm yam, los ntawm infrared spectroscopy, nuclear magnetic resonance, roj chromatography, X-ray diffraction, Thermogravimetric-differential thermal tsom xam thiab lwm yam kev ua cim yog siv. los soj ntsuam thiab qhia tus yam ntxwv ntawm cov khoom tus qauv, hloov uniformity, molar hloov degree, crystallinity, thermal stability, thiab lwm yam. Cov txheej txheem xeem xa mus rau ASTM cov qauv.

Hydroxyethyl cellulose, ib qho tseem ceeb ntawm cov cellulose derivative, tau nyiam cov xim vim nws cov khoom siv raw khoom ntau, rov ua dua tshiab, biodegradable, nontoxic, biocompatible, thiab siab yield. Lub viscosity ntawm hydroxyethyl cellulose yog ib qho tseem ceeb qhia txog nws kev ua tau zoo. Lub viscosity ntawm npaj hydroxyethyl cellulose yog siab tshaj 5 × 104mPa·s, thiab cov hmoov tshauv yog tsawg dua 0.3%.

Nyob rau hauv daim ntawv no, high-viscosity hydroxyethyl cellulose tau npaj los ntawm cov kua-theem synthesis txoj kev los ntawm alkalization thiab etherification. Cov txheej txheem alkalization yog kev npaj ntawm alkali cellulose. Xaiv los ntawm ob txoj kev alkalization. Ib qho yog tias cov khoom siv cellulose ncaj qha alkalized nrog acetone raws li ib tug diluent nyob rau hauv ib tug aqueous sodium hydroxide tov, thiab ces undergoes ib tug etherification cov tshuaj tiv thaiv nrog ib tug etherifying tus neeg saib xyuas. Lwm qhov yog tias cov khoom siv cellulosic yog alkalized hauv aqueous sodium hydroxide tov thiab urea. Qhov ntau dhau alkali hauv alkali cellulose yuav tsum tau muab tshem tawm ua ntej cov tshuaj tiv thaiv. Hauv daim ntawv no, ntau yam alkali celluloses tau kawm los ntawm infrared spectroscopy thiab X-ray diffraction. Thaum kawg, txoj kev thib ob yog saws raws li cov khoom ntawm etherification khoom.

Txhawm rau txiav txim siab txog kev npaj cov kauj ruam ntawm etherification, cov tshuaj tiv thaiv mechanism ntawm antioxidant, alkali thiab glacial acetic acid nyob rau hauv cov txheej txheem ntawm noj mov tau kawm. Cov xwm txheej cuam tshuam rau kev npaj ntawm hydroxyethyl cellulose tau txiav txim siab los ntawm ib qho kev sim. Raws li tus nqi viscosity ntawm cov khoom hauv 2% aqueous tov. Cov txiaj ntsig kev sim qhia tau hais tias qhov ntim ntawm diluent, tus nqi ntawm ethylene oxide, lub sij hawm alkalization, qhov kub thiab lub sij hawm ntawm thawj thiab thib ob rehydration muaj kev cuam tshuam zoo rau cov khoom lag luam. Cov txheej txheem ntawm xya yam thiab peb theem tau txais los txiav txim siab txog txoj kev npaj zoo tshaj plaws.

Peb txheeb xyuas cov khoom ntawm cov khoom npajhydroxyethyl cellulose, suav nrog viscosity, tshauv, lub teeb xa tawm, noo noo, thiab lwm yam. Cov yam ntxwv ntawm tus yam ntxwv, hloov homogeneity, hloov molarity, crystallinity thiab thermal stability tau tham los ntawm infrared, nuclear magnetic resonance, roj chromatography, X-ray diffraction, DSC thiab DAT, thiab cov Cov txheej txheem xeem tau txais cov qauv ASTM.