Hydroxyethyl celluloseyog ib qho tseem ceeb cellulose derivative. Vim tias qhov zoo ntawm cov khoom siv raw ntau, txuas dua tshiab, zoo biocompatibility, thiab cov txiaj ntsig zoo, nws tau nyiam ntau xim. Cov. Viscosity tus nqi yog qhov tseem ceeb heev Performance index ntawm hydroxyethyl cellulose. Hauv daim ntawv no, hydroxyethyl cellulose nrog viscosity nqi saum 5 · S thiab cov hmoov tshauv los ntawm cov txheej txheem sib xws thiab muaj ob kauj ruam ob-kauj ruam.
Tus txheej txheem alkalization yog cov txheej txheem npaj ntawm alkali cellulose. Hauv daim ntawv no, ob txoj kev sib kis tau siv. Thawj txoj kev yog siv acetone ua rau kev ua rau siab. Lub cellulose raw cov khoom yog ncaj qha qhia ncaj qha nyob rau hauv qee lub tswv yim ntawm sodium aque aque kua. Tom qab cov kev tawm tsam hauv qab yog nqa tawm, ib tus neeg sawv cev Etherovualual kom raug xa ncaj qha rau kev coj ncaj qha rau kev tawm tsam. Qhov thib ob txoj kev yog tias lub cellulose raw khoom yog alkalized nyob rau hauv ib tug epoment urea hydroxide thiab urea, thiab urea, thiab urea, thiab urea, thiab urea, thiab urea, thiab urea-urea Cov alkali cellulose npaj los ntawm cov qauv sib txawv tau raug tshuaj xyuas los ntawm infrared spectroscopy thiab xoo hluav taws xob txawv. Raws li cov khoom ntawm cov khoom uas tau npaj los ntawm Etherification cov tshuaj tiv thaiv, cov qauv kev xaiv yog txiav txim siab.
Txhawm rau txiav txim siab qhov zoo tshaj plaws etheremical synthesis cov txheej txheem, cov kev tawm tsam ntawm antioxidant, le glac acid acid nyob rau hauv lub etetched tiv thaiv tau txheeb xyuas ua ntej. Tom qab ntawd tsim cov kev sim ntawm ib qho kev tawm tsam, txiav txim siab qhov kev ua tau zoo ntawm cov khoom lag luam hydroxyethyl cellulose, thiab siv viscosity ntawm cov khoom lag luam 2% kev daws teeb meem raws li kev siv ntsuas. Cov txiaj ntsig kev sim qhia tau tias xws li xaiv cov tshuaj rau ethylene ntxiv, qhov kub thiab sijhawm kub thiab sijhawm ntau rau kev ua tau zoo ntawm cov khoom. Ib qho orthogonal sim cov txheej txheem nrog xya theem thiab peb qib tau kos, thiab cov txiaj ntsig nkhaus tau pom cov txiaj ntsig kev sim tuaj yeem pom tau pom qhov ua tau pom kev sim los ntawm cov thawj thiab theem nrab thiab cuam tshuam nrog txhua yam. Txhawm rau npaj cov khoom lag luam nrog cov qauv viscosity, thiab cov phiaj xwm zoo rau kev npaj hydroxyethyl cellulose thaum kawg txiav txim siab thaum kawg sim cov txiaj ntsig.
Cov khoom ntawm cov npaj siab-viscosityhydroxyethyl cellulosetau txheeb xyuas thiab kuaj, suav nrog kev txiav txim siab viscosity, roj kev sib txawv, thiab lwm yam. Txhawm rau txheeb xyuas thiab cov qauv khoom lag luam, cov kev sib luag hloov chaw, cov kev hloov pauv hniav puas haum, crystallinity, thermal stability, thiab lwm yam ntawm cov qauv ASTM.
Hydroxyethyl cellulose, ib qho tseem ceeb cellule cellulose, tau nyiam saib xyuas vim nws cov peev txheej raw ntau dua, txuas dua tshiab, nontoxic, biocompible, thiab siab tawm los. Lub viscosity ntawm hydroxyethyl cellulose yog qhov taw qhia tseem ceeb heev ntawm nws cov kev ua tau zoo. Lub viscosity ntawm npaj hydroxyethyl cellulose yog saum 5 × 104Mpa · S, thiab cov hmoov tshauv tsawg dua 0.3%.
Hauv daim ntawv no, siab-viscosity hydrotethyl cellulose tau npaj los ntawm cov kua-theem hluavtaws thiab etherical. Tus txheej txheem alkalization yog kev npaj ntawm alkali cellulose. Xaiv los ntawm ob txoj kev sib dhos. Ib qho yog tias cov khoom siv cellulose ncaj qha yog acetone raws li diluous nrog sodium sofium hydroxide tov, thiab tom qab ntawd undergoes cov tshuaj tiv thaiv nrog tus neeg sawv cev etherming. Lwm tus yog tias cov khoom siv cellulosic yog alkalized nyob rau hauv aqueous sodium hydrocide tov thiab urea. Qhov tshaj Alkali hauv Alkali cellulose yuav tsum tau muab tshem tawm ua ntej cov tshuaj tiv thaiv. Hauv daim ntawv no, ntau yam alkali celluloses yog kawm los ntawm infrared spectroscopy thiab xoo hluav taws xob txawv. Thaum kawg, tus qauv thib ob yog saws raws li cov khoom ntawm etherification cov khoom lag luam.
Txhawm rau txiav txim siab cov txheej txheem npaj ntawm etherification, cov kev tawm tsam ntawm antioxidant, alkali thiab glacial acetic acid nyob rau hauv cov txheej txheem ntawm kev noj mov tau kawm. Qhov xwm txheej cuam tshuam rau kev npaj ntawm hydroxyethyl cellulose tau txiav txim siab los ntawm ib qho kev sim ua ib qho. Raws li cov viscosity tus nqi ntawm cov khoom hauv 2% kev daws teeb meem. Cov txiaj ntsig kev sim qhia tau tias cov ntim ntawm diluent, tus nqi ntawm ethylene oxide, qhov kub thiab sijhawm kub thiab thib ob muaj kev cuam tshuam zoo ntawm cov khoom lag luam. Txoj kev ntawm xya yam thiab peb qib tau txais los txiav txim siab qhov kev npaj ua zoo tshaj plaws.
Peb tshawb xyuas cov khoom ntawm cov npajhydroxyethyl cellulose, suav nrog viscosity, tshauv, kev hloov chaw, noo noo, crystallinity tau sib tham, cov duab xoo hluav taws xob, DSC thiab Dat, thiab cov Cov qauv kev xeem saws cov astm cov qauv.
Lub Sijhawm Post: Apr-25-2024