I-Cellulose ether yi-polymer compound eyenziwe nge-cellulose yendalo ngenkqubo ye-etherification, kwaye iyinto etyebisayo negcina amanzi kakuhle.
Imvelaphi yoPhando
Ii-cellulose ethers zisetyenziswe kakhulu kwi-dry-mixed mortar kwiminyaka yakutshanje, ezona zisetyenziswa kakhulu zii-non-ionic cellulose ethers, kuquka i-methyl cellulose ether (MC), i-hydroxyethyl cellulose ether (HEC), i-hydroxyethyl cellulose ether iMethyl cellulose ether (HEMC) kunye ne-hydroxypropyl methyl cellulose ether (HPMC). Okwangoku, azikho iincwadi ezininzi malunga nendlela yokulinganisa i-viscosity yesisombululo se-cellulose ether. Kwilizwe lethu, yimigangatho kunye nee-monographs kuphela ezichaza indlela yokuvavanya i-viscosity yesisombululo se-cellulose ether.
Indlela yokulungiselela isisombululo se-cellulose ether
Ukulungiswa kwesisombululo se-Methyl Cellulose Ether
Ii-ether ze-Methyl cellulose zibhekisa kwii-ether ze-cellulose eziqulathe amaqela e-methyl kwi-molecule, njenge-MC, i-HEMC kunye ne-HPMC. Ngenxa yokuba iqela le-methyl alinawo amandla okumelana ne-hydrophobicity, izisombululo ze-ether ze-cellulose eziqulathe amaqela e-methyl zineempawu ze-gelation ezishushu, oko kukuthi, azinyibiliki emanzini ashushu kubushushu obuphezulu kunobushushu bazo be-gelation (malunga ne-60-80°C). Ukuze kuthintelwe isisombululo se-ether se-cellulose ekwenzeni ii-agglomerates, fudumeza amanzi ngaphezu kobushushu bawo be-gel, malunga ne-80~90°C, uze wongeze umgubo we-ether ye-cellulose emanzini ashushu, uvuselele ukuze usasazeke, uqhubeke uvuselela kwaye uphole. Kubushushu obumiselweyo, ingalungiswa ibe sisisombululo se-ether se-cellulose esifanayo.
Iipropati zokunyibilika kwee-ethers eziqulethe i-methylcellulose ezingaphathwanga ngumphezulu
Ukuze kuthintelwe ukuhlanganiswa kwe-cellulose ether ngexesha lenkqubo yokunyibilika, abavelisi ngamanye amaxesha benza unyango lomphezulu weekhemikhali kwiimveliso ze-cellulose ether ezicoliweyo ukuze kulibaziseke ukunyibilika. Inkqubo yokunyibilika kwayo yenzeka emva kokuba i-cellulose ether isasazeke ngokupheleleyo, ngoko ke inokusasazeka ngqo emanzini abandayo ngexabiso le-pH elingathathi cala ngaphandle kokwenza ii-agglomerates. Okukhona ixabiso le-pH lesisombululo liphezulu, kokukhona ixesha lokunyibilika kwe-cellulose ether eneempawu zokunyibilika ezilibazisekileyo liyancipha. Lungisa ixabiso le-pH lesisombululo libe lixabiso eliphezulu. I-Alkalinity iya kususa ukunyibilika okulibazisekileyo kwe-cellulose ether, nto leyo ebangela ukuba i-cellulose ether yenze ii-agglomerates xa inyibilika. Ke ngoko, ixabiso le-pH lesisombululo kufuneka liphakanyiswe okanye lincitshiswe emva kokuba i-cellulose ether isasazeke ngokupheleleyo.
Iipropati zokunyibilika kwee-ethers ezine-methylcellulose eziphathwe ngaphezulu
Ukulungiswa kwesisombululo se-Hydroxyethyl Cellulose Ether
Isisombululo se-Hydroxyethyl cellulose ether (HEC) asinayo ipropathi ye-thermal gelation, ngoko ke, i-HEC ngaphandle konyango lomphezulu nayo iya kwenza ii-agglomerates emanzini ashushu. Abavelisi ngokubanzi benza unyango lomphezulu weekhemikhali kwi-HEC engumgubo ukuze kulibazise ukunyibilika, ukuze isasazeke ngqo emanzini abandayo ngexabiso le-pH elingathathi cala ngaphandle kokwenza ii-agglomerates. Ngokufanayo, kwisisombululo esine-alkalinity ephezulu, i-HEC inokwenza nee-agglomerates ngenxa yokulahleka kokunyibilika okulibazisekileyo. Ekubeni i-slurry yesamente iyi-alkaline emva kokufuma kwaye ixabiso le-pH yesisombululo liphakathi kwe-12 ne-13, izinga lokunyibilika kwe-ether ye-cellulose ephathwe ngumphezulu kwi-slurry yesamente nalo likhawuleza kakhulu.
Iipropati zokunyibilika kwe-HEC ephathwa ngaphezulu
Isiphelo kunye noHlahlelo
1. Inkqubo yokusasazeka
Ukuze kuthintelwe iziphumo ezimbi ngexesha lovavanyo ngenxa yokunyibilika kancinci kwezinto zonyango lomphezulu, kucetyiswa ukusebenzisa amanzi ashushu ukulungiselela.
2. Inkqubo yokupholisa
Izisombululo ze-cellulose ether mazivuselelwe kwaye zipholiswe kubushushu obuphakathi ukuze kuncitshiswe izinga lokuphola, elifuna amaxesha ovavanyo olongezelelweyo.
3. Inkqubo yokuxukuxa
Emva kokuba i-cellulose ether yongezwe emanzini ashushu, qiniseka ukuba uyaqhubeka uvuselela. Xa ubushushu bamanzi buhla ngaphantsi kobushushu bejeli, i-cellulose ether iya kuqala ukunyibilika, kwaye isisombululo siya kuba siqinile kancinci kancinci. Ngeli xesha, isantya sokuvuselela kufuneka sincitshiswe. Emva kokuba isisombululo sifikelele kwi-viscosity ethile, kufuneka sime singashukumi kangangeeyure ezingaphezu kwe-10 ngaphambi kokuba amaqamza antante kancinci aye kumphezulu ukuze aqhume aze anyamalale.
Amaqamza omoya kwisisombululo se-Cellulose Ether
4. Inkqubo yokufumisa amanzi
Umgangatho we-cellulose ether kunye namanzi kufuneka ulinganiswe ngokuchanekileyo, kwaye zama ukungalindi ukuba isisombululo sifikelele kwi-viscosity ephezulu ngaphambi kokuba uzalise amanzi.
5. Uvavanyo lokuqaqamba
Ngenxa ye-thixotropy yesisombululo se-cellulose ether, xa kuvavanywa i-viscosity yayo, xa kufakwa i-rotor ye-viscometer ejikelezayo kwisisombululo, iya kuphazamisa isisombululo kwaye ichaphazele iziphumo zokulinganisa. Ke ngoko, emva kokuba i-rotor ifakwe kwisisombululo, kufuneka ivunyelwe ime imizuzu emi-5 ngaphambi kovavanyo.
Ixesha lokuthumela: Matshi-22-2023