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Njengoko i-viscosity ye-resin esekwe emanzini iphantsi kakhulu, ayinakuhlangabezana neemfuno zokugcina kunye nokusebenza kolwakhiwo lwe-coating, ngoko ke kuyimfuneko ukusebenzisa i-thickener efanelekileyo ukulungisa i-viscosity ye-coating esekwe emanzini ibe kwimeko echanekileyo.

Kukho iintlobo ngeentlobo zezithinasi. Xa ukhetha izithinasi, ukongeza ekusebenzeni kwazo kokuqina kunye nolawulo lwe-rheology yokugquma, kufuneka kuqwalaselwe ezinye izinto ukuze i-coating ibe nokusebenza kakuhle kolwakhiwo, imbonakalo yefilimu yokugquma engcono kunye nobomi obude benkonzo.

Ukukhethwa kweentlobo ze-thickener kuxhomekeke kakhulu kwimfuno kunye nemeko yokwenyani yefomyula.

Xa ukhetha kwaye usebenzisa izithambisi-mafutha, ezi zibalulekile.

1. I-HEC enobunzima obukhulu beemolekyuli inomlinganiselo omkhulu wokuxinana xa ithelekiswa nobunzima obuphantsi beemolekyuli kwaye ibonisa ukusebenza kakuhle kokuqina ngexesha lokugcina. Kwaye xa izinga lokucheba lisanda, imeko yokujika iyatshatyalaliswa, kokukhona izinga lokucheba liphezulu, kokukhona isiphumo sobunzima beemolekyuli kwi-viscosity sincinci. Le ndlela yokuqina ayinanto yakwenza nezinto ezisisiseko, imibala kunye nezongezo ezisetyenzisiweyo, kufuneka ukhethe ubunzima beemolekyuli obufanelekileyo be-cellulose kwaye ulungise uxinzelelo lwe-thickener unokufumana i-viscosity efanelekileyo, kwaye ngaloo ndlela isetyenziswa kakhulu.

2. I-HEUR thickener sisisombululo samanzi esiqinileyo esine-diol okanye i-diol ether njenge-co-solvent, esinomxholo oqinileyo we-20% ~ 40%. Indima ye-co-solvent kukuthintela ukunamathela, kungenjalo ezo thickeners zikwimeko yejeli kuxinzelelo olufanayo. Kwangaxeshanye, ubukho be-solvent bunokuthintela imveliso ukuba ingabi shushu, kodwa kufuneka ifudumale ebusika ngaphambi kokuba isetyenziswe.

3. Iimveliso eziqinileyo nezinobukrakra obuphantsi kulula ukuzilahla kwaye zinokuthuthwa kwaye zigcinwe ngobuninzi. Ke ngoko, ezinye izinyibilikisi ze-HEUR zinomxholo oqinileyo owahlukileyo wobonelelo lwemveliso efanayo. Umxholo we-co-solvent we-low viscosity thickeners uphezulu, kwaye ubukrakra obuphakathi bepeyinti buya kuba sezantsi kancinci xa busetyenziswa, obunokulungiswa ngokunciphisa i-co-solvent eyongeziweyo kwenye indawo kwifomyula.

4. Phantsi kweemeko ezifanelekileyo zokuxuba, i-HEUR ene-viscosity ephantsi ingongezwa ngqo kwiipeyinti ze-latex. Xa usebenzisa iimveliso ze-viscosity ephezulu, i-thickener kufuneka ixutywe nomxube wamanzi kunye ne-co-solvent ngaphambi kokuba yongezwe. Ukuba wongeza amanzi ukuze uxube i-thickener ngqo, iya kunciphisa uxinzelelo lwe-co-solvent yokuqala kwimveliso, eya kwandisa ukunamathela kwaye ibangele ukuba i-viscosity inyuke.

5. Ukongeza i-thickener kwi-mixing tank kufuneka kuhlale kuthe nkqo kwaye kucothe, kwaye kufuneka kubekwe ecaleni kwe-wall tank. Isantya sokongeza akufuneki sikhawuleze kangangokuba i-thickener ihlale phezu kolwelo, kodwa kufuneka itsalwe kulwelo kwaye ijikelezwe phantsi kwi-stirving shaft, kungenjalo i-thickener ayiyi kuxutywa kakuhle okanye i-thickener iya kuba nkulu kakhulu okanye i-flocculated ngenxa yoxinzelelo olukhulu lwendawo.

6. Isixhobo sokuxubha ipeyinti se-HEUR songezwa kwi-tank yokuxuba ipeyinti emva kwezinye izinto ezingamanzi nangaphambi kokuba i-emulsion iqale, ukuze kuqinisekiswe ukuba i-gloss iphezulu.

7. Izithambisi ze-HASE zongezwa ngqo kwipeyinti ngendlela ye-emulsion xa kusenziwa iipeyinti ze-emulsion ngaphandle kokuxutywa kwangaphambili okanye ukunganyangeki kwangaphambili. Zingongezwa njengenxalenye yokugqibela kwisigaba sokuxuba, kwisigaba sokusasazwa kwepigment, okanye njengenxalenye yokuqala ekuxubeni.

8. Ekubeni i-HASE iyi-emulsion ene-asidi ephezulu, emva kokongeza, ukuba kukho i-alkali kwipeyinti ye-emulsion, iya kukhuphisana nale alkali. Ke ngoko, kufuneka ukongeza i-emulsion ye-HASE thickener kancinci nangokuthe chu, kwaye uxube kakuhle, kungenjalo, iya kwenza inkqubo yokusabalalisa i-pigment okanye i-emulsion binder ingazinzi kwindawo ethile, kwaye le yokugqibela izinziswe liqela lomphezulu ongasebenzi kakuhle.

9. I-alkali ingongezwa ngaphambi okanye emva kokuba kongezwe i-agent yokutyeba. Inzuzo yokongeza ngaphambi kukuqinisekisa ukuba akukho kuzinza kwendawo yokusasazeka kwe-pigment okanye i-emulsion binder okuya kubangelwa yi-thickener ebamba i-alkali kumphezulu we-pigment okanye i-binder. Inzuzo yokongeza i-alkali emva koko kukuba amasuntswana e-thickener asasazeka kakuhle ngaphambi kokuba adumbe okanye anyibilike yi-alkali, nto leyo ethintela ukutyeba kwendawo okanye ukuhlangana, kuxhomekeke kwifomyula, izixhobo kunye nenkqubo yokwenziwa. Eyona ndlela ikhuselekileyo kukuxuba i-HASE thickener ngamanzi kuqala uze uyinciphise nge-alkali kwangaphambili.

10. I-HASE thickener iqala ukudumba kwi-pH emalunga ne-6, kwaye ukusebenza kakuhle kokujiya kudlala indima epheleleyo kwi-pH ye-7 ukuya kwi-8. Ukulungisa i-pH yepeyinti ye-latex ibe ngaphezulu kwe-8 kunokugcina i-pH yepeyinti ye-latex ingaphantsi kwe-8, ngaloo ndlela kuqinisekiswa uzinzo lwe-viscosity.