Ukukhiqiza i-hydroxyethyl cellulose (HEC) kuhilela uchungechunge lwezimpendulo zamakhemikhali ukuguqula i-cellulose, i-polymer yemvelo etholakala ezitshalweni. I-HEC isetshenziswa kabanzi ezimbonini ezahlukahlukene, okuhlanganisa nemithi, izimonyo, ukudla, kanye nokwakha, ngenxa yezakhiwo zayo ezijiyile, ezizinzisayo, kanye nezindawo zokugcina amanzi.
Isingeniso ku-Hydroxyethyl Cellulose (HEC)
I-Hydroxyethyl cellulose (HEC) iyi-polymer engeyona i-ionic, encibilikayo emanzini etholakala ku-cellulose ngokuguqulwa kwamakhemikhali. Isetshenziswa kabanzi njenge-ejenti yokuqina, i-gelling, kanye nokuzinzisa ezimbonini ezahlukahlukene.
Ama-Raw material
I-Cellulose: Izinto eziyinhloko zokusetshenziswa zokukhiqiza i-HEC. I-Cellulose ingatholakala ezintweni ezahlukahlukene ezisekelwe ezitshalweni ezifana ne-pulp yokhuni, ukotini, noma izinsalela zezolimo.
I-Ethylene Oxide (EO): Ikhemikhali ebalulekile esetshenziselwa ukwethula amaqembu e-hydroxyethyl emgogodleni we-cellulose.
I-alkali: Ngokuvamile i-sodium hydroxide (NaOH) noma i-potassium hydroxide (KOH) isetshenziswa njengesikhuthazi ekuphenduleni.
Inqubo Yokukhiqiza
Ukukhiqizwa kwe-HEC kuhilela ukwenziwa kwe-cellulose nge-ethylene oxide ngaphansi kwezimo ze-alkaline.
Izinyathelo ezilandelayo zichaza inqubo:
1. Ukwelashwa kwe-Cellulose ngaphambi kokwelashwa
I-cellulose ihlanzwa kuqala ukuze kususwe ukungcola okufana ne-lignin, i-hemicellulose, nezinye izinto ezikhipha ukungcola. I-cellulose ehlanziwe ibe yomiswa ibe nomswakama othize.
2. Ukusabela kwe-Etherification
Ukulungiswa kwe-Alkaline Solution: Kulungiswa isixazululo samanzi se-sodium hydroxide (NaOH) noma i-potassium hydroxide (KOH). Ukuhlushwa kwesisombululo se-alkali kubalulekile futhi kudinga ukulungiswa ngokusekelwe ezingeni elifunekayo lokufaka esikhundleni (DS) somkhiqizo wokugcina.
Ukusethwa Kokusabela: I-cellulose ehlanziwe ihlakazeka esixazululweni se-alkali. Ingxube ishiswa ekushiseni okuthile, ngokuvamile cishe ngo-50-70°C, ukuqinisekisa ukuthi i-cellulose ivuvukele ngokuphelele futhi iyatholakala ukuze isabela.
Ukwengezwa kwe-Ethylene Oxide (EO): I-Ethylene oxide (EO) ifakwa kancane kancane esitsheni sokusabela ngenkathi kugcinwa izinga lokushisa futhi kuvuselelwa njalo. Ukusabela ku-exothermic, ngakho-ke ukulawula izinga lokushisa kubalulekile ukuvimbela ukushisa ngokweqile.
Ukuqapha Ukusabela: Intuthuko yokusabela iqashwa ngokuhlaziya amasampula ngezikhathi ezithile. Amasu afana ne-Fourier-transform infrared spectroscopy (FTIR) angasetshenziswa ukunquma izinga lokufakwa esikhundleni (DS) kwamaqembu e-hydroxyethyl kumgogodla we-cellulose.
Ukungaguquguquki Nokuwasha: Uma i-DS efiselekayo isifinyelelwe, ukusabela kuyacinywa ngokususa isisombululo se-alkaline nge-asidi, ngokuvamile i-acetic acid. I-HEC ephumayo igezwa kahle ngamanzi ukuze kususwe noma yiziphi izinto ezingaguquguquki kanye nokungcola.
3. Ukuhlanzwa Nokomiswa
I-HEC ehlanziwe ihlanzwa ngokuhluzwa noma nge-centrifugation ukuze kususwe noma yikuphi ukungcola okusele. I-HEC ehlanziwe ibe yomiswa ibe nomswakama othize ukuze kutholakale umkhiqizo wokugcina.
Ikhwalithi yokulawula
Ukulawulwa kwekhwalithi kubalulekile kuyo yonke inqubo yokukhiqiza ye-HEC ukuqinisekisa ukuvumelana nobumsulwa bomkhiqizo wokugcina. Imingcele ebalulekile okufanele iqashelwe ifaka:
Izinga lokushintshana (DS)
Ukuthamba
Okuqukethwe komswakama
pH
Ubumsulwa (ukungabikho kokungcola)
Amasu okuhlaziya afana ne-FTIR, ukulinganisa i-viscosity, kanye nokuhlaziywa kwezinto eziyisisekelo avame ukusetshenziswa ekulawuleni ikhwalithi.
Ukusetshenziswa kwe-Hydroxyethyl Cellulose (HEC)
I-HEC ithola izinhlelo zokusebenza ezimbonini ezahlukahlukene ngenxa yezakhiwo zayo eziguquguqukayo:
Imithi: Isetshenziswa njenge-ejenti yokujiya ekumisweni ngomlomo, ekwakhiweni kwangaphandle, kanye nasezinhlelweni zokulethwa kwemithi ekhishwa ngokulawulwayo.
Izimonyo: Ivame ukusetshenziswa kuma-creams, ama-lotion, kanye nama-shampoo njenge-thickener kanye ne-stabilizer.
Ukudla: Kufakwa emikhiqizweni yokudla njenge-ejenti yokujiya kanye ne-gelling, i-emulsifier, kanye ne-stabilizer.
Ukwakhiwa: Kusetshenziswa kuma-mortar asekelwe kusimende kanye nama-grout ukuthuthukisa ukusebenza kahle kanye nokugcinwa kwamanzi.
Izinto Ezicatshangelwayo Kwezemvelo Nokuphepha
Umthelela Kwezemvelo: Ukukhiqizwa kwe-HEC kuhilela ukusetshenziswa kwamakhemikhali anjenge-ethylene oxide nama-alkali, angaba nemiphumela emvelweni. Ukuphathwa kahle kwemfucuza kanye nokunamathela emithethweni kubalulekile ukuze kuncishiswe umthelela emvelweni.
Ukuphepha: I-ethylene oxide iyigesi esabela kakhulu futhi evuthayo, ebeka izingozi zokuphepha ngesikhathi sokuphathwa nokugcinwa. Umoya owanele, imishini yokuzivikela yomuntu siqu (PPE), kanye nezinqubo zokuphepha kuyadingeka ukuqinisekisa ukuphepha kwabasebenzi.
I-Hydroxyethyl cellulose (HEC) iyi-polymer ewusizo enezinhlelo zokusebenza ezahlukahlukene ezimbonini ezisukela kwezemithi kuya kwezokwakha. Ukukhiqizwa kwayo kuhilela ukwenziwa kwe-cellulose nge-ethylene oxide ngaphansi kwezimo ze-alkaline. Izinyathelo zokulawula ikhwalithi zibalulekile ukuqinisekisa ukuvumelana nobumsulwa bomkhiqizo wokugcina. Izinto ezicatshangelwayo zemvelo nokuphepha kumele nazo zibhekwe kuyo yonke inqubo yokukhiqiza. Ngokulandela izinqubo nezinqubo ezifanele, i-HEC ingakhiqizwa kahle ngenkathi inciphisa umthelela emvelweni futhi iqinisekisa ukuphepha kwabasebenzi.
Lo mhlahlandlela ophelele uhlanganisa inqubo yokukhiqiza i-hydroxyethyl cellulose (HEC) ngokuningiliziwe, kusukela ezintweni zokusetshenziswa kuya ekulawulweni kwekhwalithi kanye nokusetshenziswa, okunikeza ukuqonda okuphelele kwenqubo yokukhiqiza yale polymer ebalulekile.
Isikhathi sokuthunyelwe: Ephreli-10-2024