Cellulose-ka Hydroxyethylwaa wax soo saar cellulose muhiim ah. Iyada oo ay ugu wacan tahay faa'iidooyinka kheyraadka ceeriin ee badan, dib loo cusboonaysiin karo, la burburin karo, aan sun ahayn, iswaafajin wanaagsan oo noolaha ah, iyo wax soo saar badan, cilmi-baaristeeda iyo codsigeeda ayaa soo jiitay dareen badan. Qiimaha iswaafajinta waa tusmada waxqabadka aad muhiim u ah ee cellulose hydroxyethyl. Warqaddan, cellulose hydroxyethyl oo leh qiime iswaafajin ah oo ka sarreeya 5 × 104mPa·s iyo qiimaha dambaska oo ka yar 0.3% waxaa lagu diyaariyey habka isku-darka dareeraha ah iyada oo loo marayo habka alkalization iyo etherification laba-tallaabo ah.
Habka alkaliyeynta waa habka diyaarinta cellulose-ka alkali. Warqaddan, laba hab oo alkaliyeynta ah ayaa la isticmaalaa. Habka koowaad waa in acetone loo isticmaalo sidii xal lagu milmo. Walxaha ceeriin ee cellulose-ka waxaa si toos ah loogu saleeyaa isku-darka gaar ah ee xalka biyaha ee sodium hydroxide. Ka dib marka la sameeyo falgalka salkaynta, waxaa lagu daraa wakiil etherifying ah si uu si toos ah u fuliyo falgalka etherification-ka. Habka labaad waa in walaxda ceeriin ee cellulose-ka lagu alkaliyeeyo xal biyood ah oo sodium hydroxide iyo urea ah, alkali cellulose-ka lagu diyaariyey habkan waa in la cadaadiyaa si looga saaro lye xad-dhaaf ah ka hor falgalka etherification-ka. Cellulose-ka alkali ee lagu diyaariyey habab kala duwan ayaa lagu falanqeeyay spectroscopy-ga infrared iyo kala-soocidda X-ray. Sida laga soo xigtay sifooyinka alaabta lagu diyaariyey falgalka etherification-ka, habka xulashada ayaa la go'aamiyaa.
Si loo go'aamiyo habka ugu wanaagsan ee loo sameeyo etherification, habka falcelinta ee antioxidant-ka, lye iyo glacial acetic acid ee falgalka etherification ayaa marka hore la falanqeeyay. Kadib samee barnaamijka tijaabada ah ee falgalka hal-hal-hal, go'aami arrimaha saameyn weyn ku leh waxqabadka hydroxyethyl cellulose-ka la diyaariyey, oo isticmaal viscosity-ga xalka biyaha ee 2% ee badeecada sida tusmada tixraaca. Natiijooyinka tijaabada waxay muujinayaan in arrimo ay ka mid yihiin xaddiga la xushay ee milmi kara, xaddiga ethylene oxide ee lagu daray, waqtiga alkalization-ka, heerkulka iyo waqtiga falgalka koowaad, heerkulka iyo waqtiga falgalka labaad dhammaantood ay saameyn weyn ku leeyihiin waxqabadka badeecada. Qorshe tijaabo ah oo orthogonal ah oo leh toddobo arrimood iyo saddex heer ayaa la sameeyay, qalooca saamaynta ee laga soo qaatay natiijooyinka tijaabada ayaa si muuqaal ah u falanqeyn kara arrimaha aasaasiga ah iyo kuwa labaad iyo isbeddelka saameynta ee qodob kasta. Si loo diyaariyo alaabada leh qiimayaal viscosity sare, waxaa la sameeyay qorshe tijaabo ah oo la habeeyay, waxaana ugu dambeyntii lagu go'aamiyay nidaamka ugu wanaagsan ee diyaarinta hydroxyethyl cellulose iyada oo loo marayo natiijooyinka tijaabada.
Sifooyinka nuugista sare ee la diyaariyeycellulose hydroxyethylWaxaa la falanqeeyay oo la tijaabiyay, oo ay ku jiraan go'aaminta viscosity, nuxurka dambaska, gudbinta iftiinka, qoyaanka, iwm., iyada oo loo marayo spectroscopy-ga infrared, resonance magnetic nukliyeer, chromatography gaaska, kala-soocidda raajada, falanqaynta kuleylka kala duwan ee Thermogravimetric iyo habab kale oo lagu garto ayaa loo isticmaalaa in lagu falanqeeyo oo lagu garto qaab-dhismeedka badeecada, isku-midnimada beddelka, heerka beddelka molar, crystallinity, xasilloonida kulaylka, iwm. Hababka tijaabada waxay tixraacaan heerarka ASTM.
Hydroxyethyl cellulose, oo ah wax soo saar cellulose muhiim ah, ayaa soo jiidatay dareenka sababtoo ah kheyraadkeeda ceeriin ee badan, kuwa la cusboonaysiin karo, kuwa baaba'aya, kuwa aan sun ahayn, kuwa bayoolojiga la jaanqaadi kara, iyo wax soo saar sare. Dheefshiidka hydroxyethyl cellulose waa tilmaame aad muhiim u ah oo muujinaya waxqabadkiisa. Dheefshiidka hydroxyethyl cellulose ee la diyaariyey wuxuu ka sarreeyaa 5×104mPa·s, dambaska ku jirana wuxuu ka yar yahay 0.3%.
Warqaddan, hydroxyethyl cellulose oo ah viscosity high-viscosity waxaa lagu diyaariyey habka isku-darka marxaladda dareeraha ah iyada oo loo marayo alkalization iyo etherification. Habka alkalization waa diyaarinta alkali cellulose. Ka dooro laba hab oo alkalization ah. Midda koowaad waa in walaxda cellulose si toos ah loogu alkaliyo acetone iyadoo lagu qaso xal sodium hydroxide ah oo biyo ah, ka dibna waxaa la mariyaa falgal etherification ah oo leh wakiil etherifying ah. Tan kale waa in walaxda cellulosic-ga lagu alkaliyo xalka sodium hydroxide ee biyaha iyo urea. Alkali-ga xad-dhaafka ah ee ku jira cellulose-ka alkali waa in laga saaraa ka hor falcelinta. Warqaddan, celluloses-ka alkali ee kala duwan waxaa lagu bartaa spectroscopy-ga infrared iyo kala-soocidda X-ray. Ugu dambeyntii, habka labaad waxaa la qaataa iyadoo loo eegayo sifooyinka alaabada etherification.
Si loo go'aamiyo tallaabooyinka diyaarinta ee etherification, waxaa la bartay habka falcelinta ee antioxidant-ka, alkali iyo glacial acetic acid inta lagu jiro habka cunista. Arrimaha saameeya diyaarinta hydroxyethyl cellulose waxaa lagu go'aamiyay tijaabo hal-cunto ah. Iyada oo lagu saleynayo qiimaha viscosity ee badeecada ku jirta xalka biyaha ee 2% ah. Natiijooyinka tijaabada waxay muujinayaan in mugga milmida, xaddiga ethylene oxide, waqtiga alkalization, heerkulka iyo waqtiga fuuq-celinta koowaad iyo labaad ay saameyn weyn ku leeyihiin waxqabadka badeecada. Habka toddoba arrimood iyo saddex heer ayaa la qaatay si loo go'aamiyo habka diyaarinta ugu fiican.
Waxaan falanqeyneynaa sifooyinka la diyaariyeycellulose hydroxyethyl, oo ay ku jiraan viscosity, dambas, gudbinta iftiinka, qoyaanka, iwm. Astaamaha qaab-dhismeedka, isku-dhafka beddelka, molarity-ga beddelka, crystallinity iyo xasilloonida kulaylka waxaa lagu falanqeeyay infrared, resonance magnetic nuclear, chromatography gaaska, kala-soocidda X-ray, DSC iyo DAT, hababka tijaabadana waxay qaateen heerarka ASTM.
Waqtiga boostada: Abriil-25-2024