Njengoba i-viscosity ye-resin esekelwe emanzini iphansi kakhulu, ayikwazi ukuhlangabezana nezidingo zokugcina nokusebenza kokwakhiwa kokugqoka, ngakho-ke kuyadingeka ukusebenzisa i-thickener efanelekile ukuze ulungise i-viscosity yokugqoka okusekelwe emanzini esimweni esifanele.
Kunezinhlobo eziningi zama-thickeners.Lapho ukhetha ama-thickeners, ngaphezu kokusebenza kahle kwawo kokuqina kanye nokulawula i-rheology yokugqoka, ezinye izici kufanele zicatshangelwe ukuze wenze ukugqoka kube nokusebenza okuhle kakhulu kokwakhiwa, ukubukeka kwefilimu engcono kakhulu yokugqoka kanye nempilo ende yesevisi.
Ukukhethwa kwezinhlobo ze-thickener kusekelwe ikakhulukazi esidingweni kanye nesimo sangempela sokubunjwa.
Lapho ukhetha futhi usebenzisa ama-thickeners, lezi zibalulekile.
1. Isisindo samangqamuzana aphezulu i-HEC inezinga elikhulu lokubopha uma liqhathaniswa nesisindo esiphansi samangqamuzana futhi libonisa ukusebenza kahle okukhulu kokuqina ngesikhathi sokulondoloza.Futhi lapho izinga lokugunda likhuphuka, isimo esisongayo siyabhujiswa, izinga lokugunda likhulu, umphumela wesisindo samangqamuzana ube mncane ku-viscosity.Lo mshini wokujiya awuhlangene nesisekelo sezinto, i-pigment kanye nezithasiselo ezisetshenzisiwe, udinga kuphela ukukhetha isisindo esifanele samangqamuzana we-cellulose futhi ulungise ukugxila kwe-thickener ungathola i-viscosity efanele, futhi ngaleyo ndlela isetshenziswe kabanzi.
I-2.HEUR thickener iyisisombululo se-viscous samanzi esine-diol noma i-diol ether njenge-co-solvent, enokuqukethwe okuqinile okungu-20%~40%.Indima ye-co-solvent ukuvimbela ukunamathela, ngaphandle kwalokho ama-thickeners anjalo asesimweni se-gel ekugxilweni okufanayo.Ngesikhathi esifanayo, ukuba khona kwe-solvent kungagwema umkhiqizo emakhazeni, kodwa kufanele ufudumale ebusika ngaphambi kokusetshenziswa.
3. Imikhiqizo eqinile ephansi, ene-viscosity ephansi kulula ukuyilahla futhi ingathuthwa futhi igcinwe ngobuningi.Ngakho-ke, amanye ama-thieners angu-HEUR anokuqukethwe okuqinile okuhlukile kokunikezwa komkhiqizo ofanayo.Okuqukethwe kwe-co-solvent ye-viscosity thickeners ephansi kuphezulu, futhi i-viscosity ye-shear yopende izoba ngaphansi kancane uma isetshenziswa, engasuswa ngokunciphisa i-co-solvent eyengeziwe kwenye indawo ekubunjweni.
4. Ngaphansi kwezimo ezifanele zokuxuba, i-low-viscosity HEUR ingafakwa ngqo kumapende we-latex.Uma usebenzisa imikhiqizo ye-viscosity ephezulu, i-thickener idinga ukuhlanjululwa ngengxube yamanzi kanye ne-co-solvent ngaphambi kokuthi ingezwe.Uma ungeza amanzi ukuze unciphise i-thickener ngokuqondile, kuzonciphisa ukugxila kwe-co-solvent yasekuqaleni emkhiqizweni, okuzokwandisa ukunamathela futhi kubangele ukuphakama kwe-viscosity.
5. Ukwengeza okokujiya ethangini lokuxuba kufanele kuqine futhi kuhambe kancane, futhi kufanele kubekwe eduze kwethangi lodonga.Ijubane lokwengeza akufanele libe ngokushesha kangangokuthi i-thickener ihlala phezu koketshezi, kodwa kufanele ihudulelwe oketshezini futhi ijikelezwe phansi eduze kwe-shaft enyakazayo, ngaphandle kwalokho i-thickener ngeke ixutshwe kahle noma i-thickener izoqina ngokweqile. noma i-flocculated ngenxa yokugxila okuphezulu kwendawo.
6. I-HEUR thickener yengezwa ethangini lokuxuba upende ngemva kwezinye izingxenye ze-liquid nangaphambi kwe-emulsion, ukuze kuqinisekiswe isicwebezelisi esiphezulu.
7. I-HASE thickeners yengezwa ngokuqondile kupende ngendlela ye-emulsion ekwenzeni amapende e-emulsion ngaphandle kokuhlanjululwa kwangaphambili noma ukungathathi hlangothi kwangaphambili.Inganezelwa njengengxenye yokugcina esigabeni sokuxuba, esigabeni sokuhlakazeka kwe-pigment, noma njengengxenye yokuqala ekuxubeni.
8. Njengoba i-HASE i-emulsion ephezulu ye-asidi, ngemva kokungeza, uma kukhona i-alkali ependeni le-emulsion, izoqhudelana nale alkali.Ngakho-ke, kuyadingeka ukwengeza i-emulsion ye-HASE thickener kancane kancane, futhi iqhube kahle, ngaphandle kwalokho, izokwenza uhlelo lokuhlakazeka kwe-pigment noma i-emulsion binder ukungazinzi kwendawo, futhi lokhu okulandelayo kuqiniswa yiqembu elingaphansi elingathathi hlangothi.
9. I-alkali ingafakwa ngaphambi noma ngemva kokuba i-ejenti yokuqina yengezwe.Inzuzo yokwengeza ngaphambili iwukuqinisekisa ukuthi akukho ukungazinzi kwendawo kokuhlakazeka kwe-pigment noma i-emulsion binder okuzobangelwa ukuqina okubamba i-alkali ebusweni bebala noma i-binder.Inzuzo yokwengeza i-alkali kamuva ukuthi izinhlayiya ze-thickener zihlakazeka kahle ngaphambi kokuba zivuvuke noma zihlakazwe yi-alkali, ukuvimbela ukuqina kwendawo noma ukuhlanganisana, kuye ngokuthi ukwakheka, imishini kanye nenqubo yokukhiqiza.Indlela ephephe kunazo zonke ukuthambisa i-HASE thickener ngamanzi kuqala bese uyinciphisa nge-alkali kusenesikhathi.
10. I-HASE thickener iqala ukukhukhumala nge-pH engaba ngu-6, futhi ukusebenza kahle kokuqina kudlala ngokugcwele ku-pH engu-7 kuya ku-8. Ukulungisa i-pH kapende we-latex ibe ngaphezu kuka-8 kungagcina i-pH kapende we-latex ekwehleni ngaphansi kuka-8. , ngaleyo ndlela kuqinisekiswe ukuzinza kwe-viscosity.
Isikhathi sokuthumela: Aug-05-2022