Iselulosi yeHydroxyethyl (HEC) yi-ether eselulosini eseluloni enyibilikayo emanzini. Isetyenziswe ngokubanzi kwiingubo ezisekelwe emanzini ngenxa yokuqina kwayo okulungileyo, i-emulsifying, ifilimu yokwenza ifilimu kunye nokumisa iipropati. Njenge-thickener kunye ne-stabilizer kwiingubo, i-HEC inokuphucula kakhulu iimpawu ze-rheological kunye nokupeyinta kweengubo.
1. Imisebenzi ephambili ye-hydroxyethyl cellulose
Kwiingubo ezisekelwe emanzini, imisebenzi ephambili ye-HEC ibonakaliswe kule miba ilandelayo:
Isiphumo sokuqina: I-HEC inamandla okuqina okuqina, anokuphucula ngokufanelekileyo i-viscosity kunye nekhono lokunqunyanyiswa kotyatyazo olusekwe emanzini kunye nokuthintela ii-pigments kunye nezigcwalisi kwi-coating ukuba zingahlali.
Ukuphucula i-rheology: I-HEC inokulungelelanisa umbane kwiingubo ezisekelwe emanzini ukwenzela ukuba ibonise i-viscosity ephantsi phantsi kwe-shear ephezulu, okwenza kube lula ukusasazeka xa upende, ngelixa ubonisa i-viscosity ephezulu phantsi kweemeko ezimileyo, ngaloo ndlela ukunciphisa ukuhamba kwepeyinti. isenzeko esijingayo.
Uzinzo oluphuculweyo: I-HEC inokumelana nokuqhwala okulungileyo kunye nokuzinza kokugcinwa, okunokwandisa ixesha leshelufu leengubo kunye nokuqinisekisa ukuzinza kwiindawo ezahlukeneyo.
Ukuphucula iipropati zokwenza ifilimu: I-HEC yenza ifilimu eguquguqukayo emva kokuba ipeyinti imile, ikhulise ukunamathela kunye nokumelana nokugqoka ifilimu yepeyinti kunye nokuphucula ukusebenza kokukhusela kwepeyinti.
2. Indlela yokusebenzisa i-HEC
Xa usebenzisa i-HEC kwiingubo ezisekelwe emanzini, iindlela zokusabalalisa kunye nokuchithwa kunye neendlela zokongezwa ngokuthe ngqo zidla ngokusetyenziswa. Oku kulandelayo ngamanyathelo athile osetyenziso kunye nobuchule:
() 1. Unyango lwangaphambili lokuchithwa kwe-HEC
I-HEC yimpuphu enzima ukuyichitha ngokuthe ngqo kwaye ngokulula yenza i-clumps emanzini. Ke ngoko, ngaphambi kokuba ungeze i-HEC, kuyacetyiswa ukuba uyisasaze kwangaphambili. Amanyathelo esiqhelo ngala alandelayo:
Gxuma kwaye usasaze: Kancinci yongeza i-HEC emanzini phantsi kwesantya esisezantsi sokuvuselela ukuphepha ukubunjwa kwe-clumps. Isixa se-HEC esongeziweyo kufuneka sihlengahlengiswe ngokweemfuno ze-viscosity ze-coating, ngokuqhelekileyo zibalelwa kwi-0.3% -1% yefomula iyonke.
Ukuthintela i-caking: Xa ufaka i-HEC, inani elincinci le-anti-caking agents, njenge-ethanol, i-propylene glycol, njl., linokongezwa kumanzi ukwenzela ukuba i-HEC powder ihlakazeke ngokulinganayo kwaye inciphise ukuba nokwenzeka kwe-caking.
(2). Ukusasazwa kunye nendlela yokuphelisa
Indlela yokusabalalisa kunye nokuchithwa kukuchitha i-HEC ngokwahlukileyo kwi-viscous liquid ngexesha lokulungiswa kwepeyinti, uze uyifake kwipeyinti. Amanyathelo athile ngala alandelayo:
Inkqubo yokuchithwa: I-HEC inzima ukuchithwa kwiqondo lokushisa eliqhelekileyo okanye eliphantsi, ngoko ke amanzi anokufudumala ngokufanelekileyo ukufikelela kwiqondo lokushisa kwe-30-40 ° C ukukhawuleza ukuchithwa kwe-HEC.
Ixesha lokuvuselela: I-HEC inyibilika kancinci kwaye ngokuqhelekileyo ifuna ukuxutywa kweeyure ze-0.5-2 ide inyibilike ngokupheleleyo ibe yi-viscous liquid ecacileyo okanye eguquguqukayo.
Lungisa ixabiso le-pH: Emva kokuba i-HEC ichithwe, ixabiso le-pH lesisombululo linokulungiswa ngokweemfuno, ngokuqhelekileyo phakathi kwe-7-9, ukuphucula ukuzinza kwengubo.
(3). Indlela yokongeza ngokuthe ngqo
Indlela yokongeza ngokuthe ngqo kukongeza i-HEC ngokuthe ngqo kwinkqubo yokugqoka ngexesha lenkqubo yokuvelisa i-coating, efanelekileyo kwiimfuno zenkqubo ekhethekileyo. Nceda uqaphele la manqaku alandelayo xa usebenza:
Yomisa kuqala kwaye emva koko umanzi: YongezaI-HECkwindawo eyomileyo yepeyinti esekwe emanzini kuqala, yixube ngokulinganayo kunye nezinye iipowders, kwaye emva koko wongeze amanzi kunye nezinto ezingamanzi ukunqanda i-agglomeration.
Ukulawulwa kwe-Shear: Xa ufaka i-HEC kwi-coating, kuyimfuneko ukusebenzisa izixhobo zokuxuba eziphezulu, ezifana ne-disperser ye-speed-speed disperser, ukwenzela ukuba i-HEC ihlakazwe ngokulinganayo ngexesha elifutshane kwaye ifikelele kwi-viscosity efunekayo.
3. Ukulawulwa kwedosi ye-HEC
Kwiingubo ezisekelwe emanzini, isixa se-HEC kufuneka silawulwe ngokweemfuno zangempela zengubo. I-HEC eninzi kakhulu iya kubangela ukuba i-coating viscosity ibe phezulu kwaye ichaphazele ukusebenza; I-HEC encinci kakhulu ayinakufezekisa umphumo olindelekileyo wokuqina. Ngaphantsi kweemeko eziqhelekileyo, i-dosage ye-HEC ilawulwa kwi-0.3% -1% yefomyula iyonke, kwaye umlinganiselo othile unokulungiswa ngokusebenzisa iimvavanyo.
4. Izilumkiso ze-HEC kwiingubo ezisekelwe emanzini
Kuphephe i-agglomeration: I-HEC ithande ukuhlangana emanzini, ke xa uyongeza, yongeze ngokucothayo, usasaze ngokulinganayo, kwaye uphephe ukuxubana komoya kangangoko.
Ukushisa okuchithwayo: I-HEC ichithwa ngokukhawuleza kumaqondo aphezulu, kodwa izinga lokushisa akufanele lidlule i-50 ° C, ngaphandle koko i-viscosity yayo inokuchaphazeleka.
Iimeko eziphazamisayo: Ukuvuselela okuqhubekayo kuyadingeka ngexesha lenkqubo yokuchithwa kwe-HEC, kunye nezikhongozeli ezineziciko kufuneka zisetyenziswe kangangoko ukuthintela ukungcoliswa kokungcola kwangaphandle kunye nokunyuka kwamanzi.
Ukulungelelaniswa kwexabiso le-pH: I-viscosity ye-HEC iya kwanda phantsi kweemeko ze-alkaline, ngoko ixabiso le-pH lesisombululo lifuna ukulungiswa ngokufanelekileyo ukukhusela ukusebenza kwengubo ekunciphiseni ngenxa ye-pH eninzi.
Uvavanyo lokuhambelana: Xa kuphuhliswa iifomyula ezintsha, ukusetyenziswa kwe-HEC kufuneka kuhlolwe ukuhambelana nezinye i-thickeners, i-emulsifiers, njl.
5. Imizekelo yokusetyenziswa kwe-HEC kwiingubo ezisekelwe emanzini
I-HEC ingasetyenziswa njenge-thickener kuzo zombini iintambo zodonga lwangaphakathi olusekwe emanzini kunye neengubo zangaphandle ezisekelwe emanzini. Umzekelo:
Ipeyinti yodonga lwangaphakathi lwangaphakathi lwamanzi: I-HEC isetyenziselwa ukuphucula iimpawu zokulinganisa zepeyinti, ukwenza isicelo sibe lula kwaye ngakumbi, kunye nokunciphisa amanqaku ebrashi.
Ukugquma kodonga lwangaphandle olusekwe ngamanzi: I-HEC inokunyusa ukuxhathisa kwe-sag kunye nokumelana nemozulu yengubo kwaye igweme umonakalo kwifilimu yokugquma obangelwa kukukhukuliseka kwemvula.
Ukusetyenziswa kwe-HEC kwiingubo ezisekelwe emanzini azikwazi nje ukuphucula ukusebenza kokwakhiwa kwengubo, kodwa nokuphucula umgangatho obonakalayo kunye nokuqina kwefilimu yokugqoka. Kwizicelo ezisebenzayo, ngokweemfuno ezithile zokugquma, indlela yokuchithwa kunye nexabiso elongezelelweyo le-HEC likhethwe ngokufanelekileyo, kwaye lidityaniswe nokulungiswa kwezinye izinto eziluhlaza, imiphumo yomgangatho ophezulu yokugqoka inokufezekiswa.
Ixesha lokuposa: Nov-10-2024