Hydroxyethyl cellulosewaa soosaar cellulose oo muhiim ah. Sababo la xiriira faa'iidooyinka kheyraadka alaabta ceeriin ee badan, dib loo cusboonaysiin karo, biodegradable, aan sun ahayn, biocompatibility wanaagsan, iyo waxsoosaar ballaaran, cilmi-baaristeeda iyo codsigeeda ayaa soo jiidatay dareen badan. . Qiimaha viscosity waa tusaha waxqabadka aad muhiim u ah ee cellulose hydroxyethyl. Warqadan, hydroxyethyl cellulose leh qiimaha viscosity ee ka sarreeya 5 × 104mPa·s iyo dambaska qiimaha wax ka yar 0.3% ayaa lagu diyaariyay habka isku-dhafka dareeraha-waji iyada oo loo marayo alkalization iyo etherification habka laba-tallaabo.
Habka alkalization waa habka diyaarinta ee cellulose alkali. Warqadan, laba hab oo alkalization ah ayaa la isticmaalaa. Habka ugu horeeya waa in la isticmaalo acetone sida dareere ah. Maaddooyinka cayriin ee cellulose waxay si toos ah ugu salaysan yihiin xaddi gaar ah oo ah xalalka aqueous sodium hydroxide. Ka dib marka falcelinta sal-dhigista la sameeyo, wakiilka etherifying ayaa lagu daraa si uu si toos ah u fuliyo falcelinta etherification. Habka labaad waa in alaabta ceeriin ah lagu alkalized in xal aqueous ah sodium hydroxide iyo urea, iyo cellulose alkali ee lagu diyaariyey habkan waa in la tuujiyo si ay meesha ka saaraysa xad-dhaaf ah laydhka ka hor falcelinta etherification. Cellulose-ka alkali ee loo diyaariyey habab kala duwan ayaa lagu falanqeeyay spectroscopy infrared iyo kala-duwanaanta raajada. Marka loo eego sifooyinka alaabooyinka ay diyaariyeen falcelinta etherification, habka xulashada ayaa la go'aamiyaa.
Si loo go'aamiyo habka ugu wanaagsan ee isku-dhafka etherification, habka falcelinta ee antioxidant, lye iyo glacial acetic acid ee falcelinta etherification ayaa la falanqeeyay marka hore. Ka dib samee barnaamijka tijaabada ah ee falcelinta hal-abuurka ah, go'aami arrimaha saamaynta weyn ku leh waxqabadka cellulose hydroxyethyl ee la diyaariyey, isticmaal viscosity ee 2% xal aqueous alaabta sida tusaha tixraaca. Natiijooyinka tijaabada ah waxay muujinayaan in arrimo ay ka mid yihiin qadarka dareeraha ah ee la doortay, qadarka ethylene oxide ee lagu daray, wakhtiga alkalization, heerkulka iyo wakhtiga falcelinta koowaad, heerkulka iyo wakhtiga falcelinta labaad dhamaantood waxay saameyn weyn ku leeyihiin waxqabadka alaabta. Nidaam tijaabo ah oo orthogonal ah oo leh toddobo arrimood iyo saddex heer ayaa la sameeyay, iyo qalooca saamaynta laga soo qaatay natiijooyinka tijaabada ayaa si muuqaal ah u falanqayn kara qodobbada aasaasiga ah iyo kuwa sare iyo isbeddelka saamaynta qodob kasta. Si loo diyaariyo alaabooyinka leh qiyamka viscosity-ka sare, nidaam tijaabo ah oo la wanaajiyey ayaa la sameeyay, iyo nidaamka ugu wanaagsan ee diyaarinta hydroxyethyl cellulose ayaa ugu dambeyntii lagu go'aamiyay natiijooyinka tijaabada ah.
Tilmaamaha viscosity-sare ee la diyaariyeyhydroxyethyl celluloseayaa la falanqeeyay oo la tijaabiyay, oo ay ku jiraan go'aaminta viscosity, content ash, gudbinta iftiinka, qoyaanka, iwm. si loo falanqeeyo oo loo tilmaamo qaab dhismeedka sheyga, lebiska beddelka ah, shahaadada beddelka molar, crystallinity, kulaylka xasilloonida, iwm. Hababka imtixaanku waxay tixraacaan heerarka ASTM.
Hydroxyethyl cellulose, derivative cellulose oo muhiim ah, ayaa soo jiidatay dareenka sababtoo ah kheyraadkeeda alaabta ceeriin ee badan, dib loo cusboonaysiin karo, biodegradable, nontoxic, biocompatible, iyo waxsoosaar sare. Viscosity of hydroxyethyl cellulose waa tilmaame aad muhiim u ah waxqabadkeeda. Viscosity ee cellulose hydroxyethyl ee la diyaariyey ayaa ka sarreeya 5 × 104mPa·s, iyo nuxurka dambaska ayaa ka yar 0.3%.
Warqadan, hydroxyethyl cellulose-viscosity-sare ayaa lagu diyaariyey habka isku-dhafka dareeraha-wejiga iyada oo loo marayo alkalization iyo etherification. Habka alkalization waa diyaarinta alkali cellulose. Ka dooro laba hab oo alkalization ah. Mid waa in maadada cellulose ay si toos ah alkalized leh acetone sida dareere ah ee xal aqueous sodium hydroxide, ka dibna la maro falcelinta etherification leh wakiilka etherifying. Midda kale waa in maadada cellulosic ay ku jirto alkalized in xal sodium hydroxide aqueous iyo urea. alkali-ka xad-dhaafka ah ee ku jira cellulose alkali waa in laga saaraa kahor falcelinta. Warqadan, celluloses kala duwan oo alkali ah ayaa lagu daraaseeyaa spectroscopy infrared iyo kala-duwanaanta raajada. Ugu dambeyntii, habka labaad waxaa loo qaataa si waafaqsan sifooyinka alaabta etherification.
Si loo go'aamiyo tallaabooyinka diyaarinta ee etherification, habka falcelinta ee antioxidant, alkali iyo glacial acetic acid ee habka cunista ayaa la bartay. Qodobbada saameeya diyaarinta hydroxyethyl cellulose waxaa lagu go'aamiyay tijaabo hal arrin ah. Iyada oo ku saleysan qiimaha viscosity ee alaabta ee 2% xal aqueous. Natiijooyinka tijaabada ah waxay muujinayaan in mugga dareeraha, qadarka ethylene oxide, wakhtiga alkalization, heerkulka iyo wakhtiga fuuq-celinta koowaad iyo labaad ay saameyn weyn ku leeyihiin waxqabadka alaabta. Habka todobada arrimood iyo saddex heer ayaa la qaatay si loo go'aamiyo habka ugu wanaagsan ee diyaarinta.
Waxaan falanqeyneynaa sifooyinka diyaarsanhydroxyethyl cellulose, oo ay ku jiraan viscosity, dambas, gudbinta iftiinka, qoyaan, iwm. Tilmaamaha qaabdhismeedka, homogeneity beddelka, molarity beddelka, crystallinity iyo xasiloonida kulaylka ayaa ka wada hadlay infrared, resonance magnetka nukliyeerka, chromatography gaaska, X-ray diffraction, DSC iyo DAT, iyo hababka imtixaanku waxay qaateen heerarka ASTM.
Waqtiga boostada: Abriil-25-2024