Pehea i hoomakaukauia ai ka hydroxyethyl cellulose?

Hydroxyethyl cellulosehe mea waiwai nui ka cellulose derivative. Ma muli o ka maikaʻi o ka nui o nā kumu waiwai maka, hiki ke hoʻololi ʻia, biodegradable, non-toxic, biocompatibility maikaʻi, a me nā hua nui, ua ʻike nui ʻia kāna noiʻi a me kāna noi. . ʻO ka waiwai viscosity kahi papa kuhikuhi hana koʻikoʻi o ka hydroxyethyl cellulose. Ma kēia pepa, ua hoʻomākaukau ʻia ka hydroxyethyl cellulose me ka waiwai viscosity ma luna o 5×104mPa·s a me ka waiwai lehu ma lalo o 0.3% e ka wai-phase synthesis method ma o ka alkalization a me ka etherification ʻelua kaʻina hana.

ʻO ke kaʻina hana alkalization ka hoʻomākaukau ʻana o ka cellulose alkali. Ma kēia pepa, hoʻohana ʻia nā ʻano hana alkaliization ʻelua. ʻO ke ala mua e hoʻohana i ka acetone ma ke ʻano he diluent. Hoʻokumu pololei ʻia ka cellulose maka kumu i loko o kahi ʻano o ka wai wai sodium hydroxide. Ma hope o ka hoʻokō ʻia ʻana o ka hopena basification, hoʻohui ʻia kahi mea etherifying e hoʻokō pololei i ka hopena etherification. ʻO ke ʻano ʻelua, ʻo ia ka mea i hoʻokaʻawale ʻia ka cellulose maka i loko o kahi wai wai o ka sodium hydroxide a me ka urea, a ʻo ka cellulose alkali i hoʻomākaukau ʻia e kēia ʻano pono e ʻoki ʻia e wehe i ka lye keu ma mua o ka hopena etherification. Ua kālailai ʻia ka cellulose alkali i hoʻomākaukau ʻia e nā ʻano like ʻole e ka infrared spectroscopy a me ka X-ray diffraction. Wahi a nā waiwai o nā huahana i hoʻomākaukau ʻia e ka hopena etherification, ua hoʻoholo ʻia ke ʻano koho.

I mea e hoʻoholo ai i ke kaʻina hana etherification synthesis maikaʻi loa, ʻike mua ʻia ke ʻano hana o ka antioxidant, lye a me ka glacial acetic acid i ka hopena etherification. A laila e hoʻolālā i ka papahana hoʻokolohua o ka hopena hoʻokahi kumu, e hoʻoholo i nā kumu i ʻoi aku ka hopena i ka hana o ka hydroxyethyl cellulose i hoʻomākaukau ʻia, a hoʻohana i ka viscosity o ka 2% aqueous solution o ka huahana ma ke ʻano he kuhikuhi kuhikuhi. Hōʻike nā hopena hoʻokolohua ʻo nā mea e like me ka nui diluent i koho ʻia, ka nui o ka ethylene oxide i hoʻohui ʻia, ka manawa alkalization, ka mahana a me ka manawa o ka pane mua, ka mahana a me ka manawa o ka pane ʻelua i ka hopena nui i ka hana o ka huahana. Ua kaha ʻia kahi hoʻolālā hoʻokolohua orthogonal me ʻehiku mau kumu a me ʻekolu pae, a hiki i ka pihi hopena i unuhi ʻia mai nā hopena hoʻokolohua hiki ke ʻike maka i nā kumu kumu a me nā kumu lua a me ke ʻano hoʻoikaika o kēlā me kēia kumu. I mea e hoʻomākaukau ai i nā huahana me nā waiwai viscosity kiʻekiʻe, ua hoʻokumu ʻia kahi hoʻolālā hoʻokolohua i hoʻopaʻa ʻia, a ua hoʻoholo hope ʻia ka hoʻolālā maikaʻi loa no ka hoʻomākaukau ʻana i ka hydroxyethyl cellulose ma o nā hopena hoʻokolohua.

Nā waiwai o ka hoʻomākaukau kiʻekiʻe-viscosityhydroxyethyl celluloseua hoʻopaʻa ʻia a hoʻāʻo ʻia, me ka hoʻoholo ʻana i ka viscosity, ka lehu lehu, ka lawe ʻana i ka māmā, ka moisture content, etc., ma o ka infrared spectroscopy, nuclear magnetic resonance, gas chromatography, X-ray diffraction, Thermogravimetric-differential thermal analysis and other characterization method is used e kālailai a ʻike i ke ʻano o ka huahana, ka like like ʻole, ka degere hoʻololi molar, crystallinity, thermal stability, etc. ʻO nā ala hoʻāʻo e pili ana i nā kūlana ASTM.

ʻO ka hydroxyethyl cellulose, kahi mea hoʻoheheʻe cellulose koʻikoʻi, ua huki ʻia ka nānā ʻana ma muli o ka nui o nā kumu waiwai maka, hiki ke hoʻololi, biodegradable, nontoxic, biocompatible, a me nā hua kiʻekiʻe. ʻO ka viscosity o ka hydroxyethyl cellulose kahi hōʻailona koʻikoʻi o kāna hana. ʻO ka viscosity o ka hydroxyethyl cellulose i hoʻomākaukauʻia ma luna o 5 × 104mPa · s, aʻo ka lehu ma lalo o 0.3%.

Ma kēia pepa, ua hoʻomākaukau ʻia ka hydroxyethyl cellulose kiʻekiʻe e ka wai-phase synthesis ma o ka alkalization a me ka etherification. ʻO ke kaʻina hana alkalization ka hoʻomākaukau ʻana i ka cellulose alkali. E koho mai ʻelua mau ʻano alkaliization. ʻO kekahi, ʻo ka mea cellulose i hoʻokaʻawale pololei ʻia me ka acetone ma ke ʻano he mea hoʻoheheʻe ʻia i loko o kahi solution sodium hydroxide wai, a laila e loaʻa i kahi hopena etherification me kahi mea etherifying. ʻO ka mea ʻē aʻe ʻo ia ka mea cellulosic i alkalized i ka wai sodium hydroxide solution a me ka urea. Pono e hoʻoneʻe ʻia ka alkali keu i loko o ka cellulose alkali ma mua o ka hopena. Ma kēia pepa, ua aʻo ʻia nā celluloses alkali like ʻole e ka spectroscopy infrared a me ka diffraction X-ray. ʻO ka mea hope loa, hoʻohana ʻia ke ala ʻelua e like me nā waiwai o nā huahana etherification.

I mea e hoʻoholo ai i nā pae hoʻomākaukau o ka etherification, ua aʻo ʻia ke ʻano hopena o ka antioxidant, alkali a me ka glacial acetic acid i ke kaʻina ʻai. Hoʻoholo ʻia nā mea e pili ana i ka hoʻomākaukau ʻana o ka hydroxyethyl cellulose e ka hoʻokolohua kumu hoʻokahi. Ma muli o ka waiwai viscosity o ka huahana ma 2% aqueous solution. Hōʻike nā hopena hoʻokolohua i ka nui o ka diluent, ka nui o ka ethylene oxide, ka manawa alkalization, ka mahana a me ka manawa o ka rehydration mua a me ka lua i ka hopena nui i ka hana huahana. Ua lawe ʻia ke ʻano o nā kumu ʻehiku a me ʻekolu pae e hoʻoholo ai i ke ʻano hoʻomākaukau maikaʻi loa.

Hoʻopili mākou i nā waiwai o ka mea i hoʻomākaukau ʻiahydroxyethyl cellulose, e pili ana i ka viscosity, lehu, light transmittance, moisture, etc. ʻO ke ʻano o ke ʻano, ka homogeneity substituent, substitution molarity, crystallinity a me ka thermal stability i kūkākūkā ʻia e ka infrared, nuclear magnetic resonance, gas chromatography, X-ray diffraction, DSC a me DAT, a me ka Ua hoʻohana ʻia nā ala hoʻāʻo i nā kūlana ASTM.