Ekuqulunqweni kwepeyinti, i-hydroxyethyl cellulose (HEC) yinto eqhelekileyo ye-thickener kunye ne-rheology modifier enokuphucula ukuzinza kokugcinwa, ukulinganisa kunye nokwakhiwa kweepeyinti. Ukuze ungeze i-hydroxyethyl cellulose kwiipeyinti kwaye uqinisekise ukuba isebenza ngokufanelekileyo, amanyathelo athile kunye nezilumkiso kufuneka zilandelwe. Inkqubo ethile imi ngolu hlobo lulandelayo:
1. Iipropati ze-hydroxyethyl cellulose
I-Hydroxyethyl cellulose i-polymer e-non-ionic yamanzi e-soluble ene-thickening egqwesileyo, ifilimu-ukwenza ifilimu, ukugcina amanzi, ukumiswa kunye neempawu ze-emulsifying. Isetyenziswa ngokuqhelekileyo kwiipeyinti ezisekelwe emanzini, i-adhesives, i-ceramics, i-inki kunye nezinye iimveliso. Ifunyenwe ngokutshintsha inxalenye yamaqela e-hydroxyl kwitsheyina le-cellulose ye-molecular kunye namaqela e-hydroxyethyl, ngoko ke ine-solubility efanelekileyo yamanzi.
Imisebenzi ephambili ye-HEC kwiipeyinti yile:
Isiphumo sokuqina: Yandisa i-viscosity yepeyinti, thintela ipeyinti ukuba ingagugi, kwaye ibe neempawu ezibalaseleyo zokwakha.
Isiphumo sokunqunyanyiswa: Inokusasaza ngokulinganayo kwaye izinze amasuntswana aqinileyo njengeebala kunye nezihluzi ukuthintela ukuzinza.
Isiphumo sokugcinwa kwamanzi: Ukuphucula ukugcinwa kwamanzi kwifilimu yokugubungela, ukwandisa ixesha elivulekileyo, kwaye uphucule umphumo wokumanzisa kwepeyinti.
Ulawulo lwe-Rheology: Lungisa ulwelo kunye nomgangatho wokugquma, kunye nokuphucula ingxaki yamanqaku ebrashi ngexesha lokwakha.
2. Amanyathelo ongezelelweyo e-hydroxyethyl cellulose
Isinyathelo sokuchithwa kwangaphambili Kwintsebenzo yangempela, i-hydroxyethyl cellulose idinga ukuchithwa ngokulinganayo kwaye ichithwe ngenkqubo yokuchithwa kwangaphambili. Ukuze kuqinisekiswe ukuba i-cellulose inokudlala ngokupheleleyo indima yayo, ngokuqhelekileyo kucetyiswa ukuba uyichithe emanzini kuqala, kunokuba uyifake ngokuthe ngqo kwi-coating. Amanyathelo athile ngala alandelayo:
Khetha i-solvent efanelekileyo: ngokuqhelekileyo amanzi adibeneyo asetyenziswa njenge-solvent. Ukuba kukho ezinye i-solvents eziphilayo kwi-coating system, iimeko zokuchithwa kufuneka zilungelelaniswe ngokweempawu ze-solvent.
Hlaza kancinane i-hydroxyethyl cellulose: Kancinci kwaye ngokulinganayo ufefe i-hydroxyethyl cellulose powder ngelixa ushukumisa amanzi ukunqanda ukuhlangana. Isantya esishukumisayo kufuneka sicothe ukuphepha ukucotha isantya sokunyibilika kweselulosi okanye ukwenza “i-colloids” ngenxa yamandla okucheba ngokugqithisileyo.
Ukunyibilika okumileyo: Emva kokufafaza i-hydroxyethyl cellulose, kufuneka iyekwe ime kangangexesha elithile (ngokuqhelekileyo imizuzu engama-30 ukuya kwiiyure ezininzi) ukuqinisekisa ukuba i-cellulose idumbile ngokupheleleyo kwaye inyibilika emanzini. Ixesha lokuchithwa lixhomekeke kuhlobo lwe-cellulose, ukushisa kwe-solvent kunye neemeko eziphazamisayo.
Lungisa ubushushu bokuphelisa: Ukunyusa ubushushu kunceda ukukhawulezisa inkqubo yokuchithwa kwe-hydroxyethyl cellulose. Kudla ngokucetyiswa ukuba ulawule ubushushu besisombululo phakathi kwe20℃-40℃. Ubushushu obuphezulu kakhulu bunokubangela ukuthotywa kweselulosi okanye ukuwohloka kwesisombululo.
Ukulungelelanisa ixabiso le-pH yesisombululo I-solubility ye-hydroxyethyl cellulose ihambelana ngokusondeleyo nexabiso le-pH yesisombululo. Ngokuqhelekileyo inyibilika ngcono phantsi kweemeko ezingathathi hlangothi okanye ezincinci ze-alkaline, kunye nexabiso le-pH phakathi kwe-6-8. Ngethuba lenkqubo yokutshatyalaliswa, ixabiso le-pH linokulungiswa ngokudibanisa i-ammonia okanye ezinye izinto ze-alkaline njengoko zifunekayo.
Ukongeza isisombululo se-hydroxyethyl cellulose kwinkqubo yokugubungela Emva kokuchithwa, yongeza isisombululo kwi-coating. Ngexesha lenkqubo yokongeza, kufuneka yongezwe kancinci kwaye ishukunyiswe ngokuqhubekayo ukuqinisekisa ukuxuba okwaneleyo kunye ne-matrix yokwambathisa. Ngethuba lenkqubo yokuxuba, kuyimfuneko ukukhetha isantya esifanelekileyo esishukumisayo ngokweenkqubo ezahlukeneyo zokuthintela inkqubo yokukhupha amagwebu okanye ukuthotywa kwe-cellulose ngenxa yokunyanzeliswa kwe-shear.
Ukulungelelanisa i-viscosity Emva kokufaka i-cellulose ye-hydroxyethyl, i-viscosity ye-coating inokulawulwa ngokulungelelanisa inani elongezelelweyo. Ngokuqhelekileyo, inani le-hydroxyethyl cellulose elisetyenzisiweyo liphakathi kwe-0.3% -1.0% (ngokunxulumene nobunzima obupheleleyo besambatho), kwaye inani elithile elongezelelweyo lifuna ukulungiswa ngokulinga ngokweemfuno zokuqulunqwa kwengubo. Ukongezwa okuphezulu kakhulu kunokubangela ukuba i-coating ibe ne-viscosity ephezulu kunye ne-fluidity embi, echaphazela ukusebenza kokwakhiwa; ngelixa ukongezwa okunganeleyo kusenokungakwazi ukudlala indima yokuqina kunye nokunqunyanyiswa.
Ukuqhuba ukulinganisa kunye nokugcinwa kweemvavanyo zokuzinza Emva kokufaka i-hydroxyethyl cellulose kunye nokulungelelanisa ifomyula yokugqoka, ukusebenza kokwakhiwa kwengubo kufuneka kuhlolwe, kubandakanywa ukulinganisa, i-sag, ulawulo lwamanqaku ebrashi, njl. Ngelo xesha, uvavanyo lokuzinza kokugcinwa kwengubo luyafuneka kwakhona. jonga i-sedimentation yengubo emva kokuma ixesha elithile, utshintsho lwe-viscosity, njl., Ukuvavanya ukuzinza kwe-hydroxyethyl cellulose.
3. Izilumkiso
Thintela i-agglomeration: Ngexesha lenkqubo yokuchithwa, i-hydroxyethyl cellulose ilula kakhulu ukufunxa amanzi kunye nokudumba, ngoko ke kufuneka ifefe emanzini ngokucothayo kwaye iqinisekise ukuvuselela okwaneleyo ukuthintela ukubunjwa kwamaqhuma. Eli likhonkco eliphambili ekusebenzeni, ngaphandle koko kunokuchaphazela izinga lokuchithwa kunye nokufana.
Gwema amandla aphezulu okucheba: Xa ufaka i-cellulose, isantya esishukumisayo akufanele sibe phezulu kakhulu ukuphepha ukonakalisa i-cellulose ye-molecular chain ngenxa yamandla amaninzi okucheba, okukhokelela ekunciphiseni kokusebenza kwayo. Ukongeza, kwimveliso yokwaleka elandelayo, ukusetyenziswa kwezixhobo zokucheba eziphezulu kufuneka kugwenywe kangangoko kunokwenzeka.
Lawula iqondo lokushisa lokunyibilika: Xa unyibilikisa i-hydroxyethyl cellulose, ubushushu bamanzi akufunekanga bube phezulu kakhulu. Kucetyiswa ngokubanzi ukuyilawula ku-20℃-40℃. Ngaphantsi kweemeko eziphezulu zokushisa, i-cellulose inokuthi ihlaziywe, ibangele ukuhla kwempembelelo yayo yokuqina kunye ne-viscosity.
Ukugcinwa kwesisombululo: Izisombululo ze-Hydroxyethyl cellulose ngokubanzi kufuneka zilungiswe kwaye zisetyenziswe ngokukhawuleza. Ukugcinwa kwexesha elide kuya kuchaphazela i-viscosity yayo kunye nokuzinza. Ngokuqhelekileyo kucetyiswa ukuba kulungiswe isisombululo esifunekayo ngosuku lokuvelisa ipeyinti ukuze kugcinwe ukusebenza kwayo okulungileyo.
Ukongezwa kwe-hydroxyethyl cellulose kwipeyinti akuyona nje inkqubo elula yokuxuba umzimba, kodwa kufuneka idibaniswe neemfuno zangempela zenkqubo kunye neenkcukacha zokusebenza ukuze kuqinisekiswe ukuba ukuqina kwayo, ukumiswa kunye nokugcinwa kwamanzi kusetyenziswe ngokupheleleyo. Ngethuba lenkqubo yokongezwa, qaphela inyathelo lokuchithwa kwangaphambili, ukulawulwa kweqondo lokushisa lokuchithwa kunye nexabiso le-pH, kunye nokuxuba okupheleleyo emva kokongezwa. Ezi nkcukacha ziya kuchaphazela ngokuthe ngqo umgangatho kunye nokuzinza kwepeyinti.
Ixesha lokuposa: Sep-19-2024