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Njengoko i-viscosity ye-resin esekelwe emanzini iphantsi kakhulu, ayikwazi ukuhlangabezana neemfuno zokugcina kunye nokusebenza kokwakhiwa kwengubo, ngoko ke kuyimfuneko ukusebenzisa i-thickener efanelekileyo ukulungelelanisa i-viscosity ye-coating-based-coating kwisimo esichanekileyo.

Kukho iintlobo ezininzi zee-thickeners.Xa ukhetha i-thickeners, ukongeza ekusebenzeni kwabo kokuqina kunye nolawulo lwe-rheology yokwambathisa, ezinye izinto kufuneka ziqwalaselwe ukwenza ukuba i-coating ibe neyona ntsebenzo intle yokwakha, eyona filimu intle yokugquma imbonakalo kunye nobomi benkonzo ende.

Ukukhethwa kweentlobo ze-thickener ikakhulu kusekelwe kwimfuno kunye nemeko yangempela yokuqulunqwa.

Xa ukhetha kwaye usebenzisa i-thickeners, ezi zibalulekile.

1. Ubunzima obuphezulu be-molecular HEC ine-degree enkulu yokudibanisa xa kuthelekiswa nobunzima obuphantsi be-molecular kwaye ibonisa ukusebenza kakuhle kokuqina ngexesha lokugcinwa.Kwaye xa izinga lokucheba linyuka, imeko ejikelezayo iyatshatyalaliswa, isantya esikhulu sokucheba, sincinci isiphumo sobunzima bemolekyuli kwi-viscosity.Le ndlela yokutyebisa ayinanto yakwenza nezinto ezisisiseko, ii-pigments kunye nezongezo ezisetyenzisiweyo, kufuneka ukhethe kuphela ubunzima bemolekyuli obufanelekileyo beselulosi kwaye uhlengahlengise ukuxinana kwe-thickener unokufumana i-viscosity efanelekileyo, kwaye ke isetyenziswa ngokubanzi.

I-2.HEUR i-thickener yisisombululo se-aqueous viscous kunye ne-diol okanye i-diol ether njenge-co-solvent, kunye nomxholo oqinileyo we-20% ~ 40%.Indima ye-co-solvent kukuthintela ukunamathela, ngaphandle koko i-thickeners enjalo ikwimeko ye-gel kwi-concentration efanayo.Kwangaxeshanye, ubukho be-solvent bunokuthintela imveliso ekukhenkceni, kodwa kufuneka ifudunyezwe ebusika ngaphambi kokusetyenziswa.

3. Iimveliso eziphantsi, eziphantsi kwe-viscosity zilula ukulahla kwaye zinokuthuthwa kwaye zigcinwe ngobuninzi.Ke ngoko, ezinye i-HEUR thickeners zinomxholo oqinileyo owahlukileyo wobonelelo lwemveliso efanayo.I-co-solvent content of low viscosity thickeners iphezulu, kwaye i-middle-shear viscosity yepeyinti iya kuba ngaphantsi kancinci xa isetyenzisiwe, enokuthi ihlaziywe ngokunciphisa i-solvent edibeneyo eyongezwe kwenye indawo ekuqulunqweni.

4. Ngaphantsi kweemeko ezifanelekileyo zokuxuba, i-low-viscosity HEUR inokongezwa ngokuthe ngqo kwiipende ze-latex.Xa usebenzisa iimveliso ze-viscosity eziphezulu, i-thickener kufuneka ihlanjululwe ngomxube wamanzi kunye ne-co-solvent ngaphambi kokuba ifakwe.Ukuba ungeze amanzi ukuze udibanise i-thickener ngokuthe ngqo, kuya kunciphisa ukuxinwa kwe-co-solvent yasekuqaleni kwimveliso, eya kwandisa ukubambelela kwaye ibangele ukunyuka kwe-viscosity.

5. Ukongeza i-thickener kwi-tank yokuxuba kufuneka izinzileyo kwaye icothe, kwaye kufuneka ibekwe ecaleni kwetanki eludongeni.Isantya sokongeza akufuneki sikhawuleze kangangokuba isingqimba sihlala phezu kolwelo, kodwa kufuneka sitsalelwe kulwelo kwaye sijikelezwe phantsi sijikeleze i-shaft eshukumisayo, kungenjalo i-thickener ayiyi kuxutywa kakuhle okanye i-thickener iya kungqimba kakhulu. okanye i-flocculated ngenxa yoxinaniso oluphezulu lwendawo.

6. I-HEUR thickener yongezwa kwitanki yokuxuba ipeyinti emva kwamanye amacandelo e-liquid naphambi kwe-emulsion, ukwenzela ukuba kuqinisekiswe ubuninzi beglosi.

7. I-HASE thickeners yongezwa ngokuthe ngqo kwipeyinti ngendlela ye-emulsion ekwenzeni iipende ze-emulsion ngaphandle kokuhlanjululwa kwangaphambili okanye i-pre-neutralization.Ingongezwa njengenxalenye yokugqibela kwisigaba sokuxuba, kwisigaba se-pigment dispersion, okanye njengenxalenye yokuqala ekuxubeni.

8. Ekubeni i-HASE i-emulsion ephezulu ye-asidi, emva kokongeza, ukuba kukho i-alkali kwipeyinti ye-emulsion, iya kukhuphisana kule alkali.Ngoko ke, kuyafuneka ukuba ungeze i-emulsion ye-HASE thickener ngokuthe ngcembe kwaye ngokukhawuleza, kwaye iqhube kakuhle, ngaphandle koko, iya kwenza inkqubo ye-pigment dispersion okanye i-emulsion binder ukungazinzi kwendawo, kwaye le yokugqibela iqiniswe liqela elingaphantsi kwe-neutralized surface.

9. I-alkali inokongezwa ngaphambi okanye emva kokuba i-agent agent yongezwa.Inzuzo yokongeza ngaphambili kukuqinisekisa ukuba akukho ukungazinzi kwendawo ye-pigment dispersion okanye i-emulsion binder iya kubangelwa yi-thickener ebamba i-alkali ukusuka kumphezulu we-pigment okanye i-binder.Inzuzo yokongeza i-alkali emva koko kukuba iinqununu ze-thickener zihlakazeke kakuhle ngaphambi kokuba zivuthwe okanye zichithwe yi-alkali, ukuthintela ukuqina kwendawo okanye i-agglomeration, kuxhomekeke ekuqulunqweni, izixhobo kunye nenkqubo yokuvelisa.Eyona ndlela ikhuselekileyo kukungxenga i-HASE thickener ngamanzi kuqala kwaye emva koko uyithobe ngealkali kwangaphambili.

10. I-HASE thickener iqala ukudumba kwi-pH emalunga ne-6, kwaye ukusebenza kakuhle kokuqina kungena kumdlalo opheleleyo kwi-pH ye-7 ukuya kwe-8. Ukulungelelanisa i-pH yepeyinti ye-latex ibe ngaphezu kwe-8 kunokugcina i-pH yepeyinti ye-latex ekunciphiseni ngaphantsi kwe-8. , ngaloo ndlela iqinisekisa ukuzinza kwe-viscosity.