I-Cellulose ether yi-polymer compound eyenziwe kwi-cellulose yendalo ngokusebenzisa inkqubo ye-etherification, kwaye igqwesileyo egqwesileyo kunye ne-arhente yokugcina amanzi.
Imvelaphi yoPhando
I-cellulose ethers isetyenziswe ngokubanzi kudaka oluxutyiweyo oluxutyiweyo kwiminyaka yakutshanje, eyona nto isetyenziswa kakhulu yi-ethers ye-cellulose engeyiyo ionic, kuquka i-methyl cellulose ether (MC), i-hydroxyethyl cellulose ether (HEC), i-hydroxyethyl cellulose ether Methyl cellulose ether (HEMC) ) kunye ne-hydroxypropyl methyl cellulose ether (HPMC).Okwangoku, akukho luncwadi oluninzi kwindlela yokulinganisa i-viscosity yesisombululo se-cellulose ether.Kwilizwe lethu, kuphela imigangatho ethile kunye ne-monographs echaza indlela yokuvavanya i-viscosity yesisombululo se-cellulose ether.
Ukulungiswa kweMethyl Cellulose Ether Solution
I-Methyl cellulose ethers ibhekisela kwi-cellulose ethers equkethe amaqela e-methyl kwi-molecule, njenge-MC, HEMC kunye ne-HPMC.Ngenxa ye-hydrophobicity yeqela le-methyl, izisombululo ze-cellulose ether eziqukethe amaqela e-methyl zineempawu ze-thermal gelation, oko kukuthi, azinakuncibilika emanzini ashushu kwiqondo lokushisa elingaphezulu kwe-gelation yabo (malunga ne-60-80 ° C).Ukuthintela isisombululo se-cellulose ether ekwenzeni i-agglomerates, fudumeza amanzi ngaphezu kobushushu be-gel, malunga ne-80 ~ 90 ° C, uze udibanise i-cellulose ether powder emanzini ashushu, ugxobhoze ukusabalalisa, qhubeka uvuselela kwaye uphole phantsi. iqondo lobushushu, inokulungiswa ibe iyunifomu cellulose ether isisombululo.
Ukuze kuthintelwe i-agglomeration ye-cellulose ether ngexesha lenkqubo yokuchithwa, abavelisi ngamanye amaxesha benza unyango lwemichiza kwimveliso ye-cellulose ether yomgubo ukulibazisa ukuchithwa.Inkqubo yokutshatyalaliswa kwayo yenzeka emva kokuba i-ether ye-cellulose ihlakazwe ngokupheleleyo, ngoko inokuchithwa ngokuthe ngqo kumanzi abandayo kunye nexabiso elingathathi hlangothi le-pH ngaphandle kokwenza i-agglomerates.Ukuphakama kwexabiso le-pH yesisombululo, lifutshane ixesha lokuchithwa kwe-ether ye-cellulose kunye neempawu zokulibaziseka zokuchithwa.Lungisa ixabiso le-pH lesisombululo kwixabiso eliphezulu.I-alkalinity iya kuphelisa ukunyibilika okulibazisekileyo kwe-ether cellulose, ebangela ukuba i-ether cellulose yenze i-agglomerates xa inyibilika.Ngoko ke, ixabiso le-pH lesisombululo kufuneka liphakanyiswe okanye lithotywe emva kokuba i-ether ye-cellulose ihlakazwe ngokupheleleyo.
Ukulungiswa kwe-Hydroxyethyl Cellulose Ether Solution
Isisombululo se-Hydroxyethyl cellulose ether (HEC) asinayo ipropathi ye-thermal gelation, ngoko ke, i-HEC ngaphandle kokunyanga kwendawo iya kwenza i-agglomerates emanzini ashushu.Abavelisi ngokubanzi benza unyango lomphezulu wekhemikhali kwi-HEC engumgubo ukulibazisa ukupheliswa, ukuze isasazwe ngokuthe ngqo kumanzi abandayo ngexabiso elingathathi hlangothi le-pH ngaphandle kokwenza i-agglomerate.Ngokufanayo, kwisisombululo esine-alkalinity ephezulu, i-HEC Inokwenza i-agglomerate ngenxa yokulibaziseka kokulahleka kwe-solubility.Ekubeni i-samente slurry i-alkaline emva kokuxutywa kunye nexabiso le-pH lesisombululo liphakathi kwe-12 kunye ne-13, izinga lokuchithwa kwe-ether ye-cellulose ephathwayo kwi-sement slurry nayo ikhawuleza kakhulu.
Isiphelo kunye noHlalutyo
1. Inkqubo yokusasazwa
Ukuze ugweme imiphumo emibi kwixesha lokuvavanya ngenxa yokuchithwa okucothayo kwezinto zonyango zomhlaba, kucetyiswa ukuba kusetyenziswe amanzi ashushu ukulungiselela.
2. Inkqubo yokupholisa
Izisombululo ze-ether ze-cellulose kufuneka zishukunyiswe kwaye zipholile kwiqondo lobushushu le-ambient ukunciphisa izinga lokupholisa, elifuna amaxesha ovavanyo olwandisiweyo.
3. Inkqubo yokuvuselela
Emva kokuba i-ether ye-cellulose ifakwe emanzini ashushu, qiniseka ukuba uhlale uvuselela.Xa ubushushu bamanzi buhla ngaphantsi kobushushu be-gel, i-cellulose ether iya kuqala ukunyibilika, kwaye isisombululo siya kuba yi-viscous.Ngeli xesha, isantya sokuvuselela kufuneka sincitshiswe.Emva kokuba isisombululo sifikelele kwi-viscosity ethile, kufuneka sime ngxi ngaphezulu kweeyure ezili-10 phambi kokuba amaqamza athi chu ukuya kumphezulu ukuze agqabhuke aphele.
4. Inkqubo yokufaka amanzi
Umgangatho we-cellulose ether kunye namanzi kufuneka ulinganiswe ngokuchanekileyo, kwaye uzame ukungalindi isisombululo sokufikelela kwi-viscosity ephezulu ngaphambi kokuzalisa amanzi.
5. Uvavanyo lwe-Viscosity
Ngenxa ye-thixotropy yesisombululo se-cellulose ether, xa uvavanya i-viscosity yayo, xa i-rotor ye-viscometer ejikelezayo ifakwe kwisisombululo, iya kuphazamisa isisombululo kwaye ichaphazele iziphumo zokulinganisa.Ngoko ke, emva kokuba i-rotor ifakwe kwisisombululo, kufuneka ivunyelwe ukuma imizuzu emi-5 ngaphambi kokuvavanya.
Ixesha lokuposa: Feb-08-2023