I-water-based (VOC & HAPs) i-coating yasimahla inokulungiswa ukusuka kwi-aliphatic epoxy kunye ne-polymerized polymerized capropone polyols kwaye ingasetyenziswa kunye nezixhobo eziqhelekileyo kwaye inamandla okutshintsha i-powder coatings.Ziziphi iingongoma zengqwalasela ekulungiseleleni amanzi. I-aliphatic epoxy liquid coatings
Utyalo-mali lwezixhobo ezisisiseko eziyimfuneko kumgca omtsha wokugquma umgubo unokuphetshwa ngokusebenzisa izixhobo zokutshiza zemveli zolwelo.Ezi ngubo zinokuguqulwa ngokuzihlambulula ngamanzi okanye ngokujiyisa iingubo ezisekelwe emanzini kunye ne-cellulose thickeners.Nge-diglycidyl ether yesiqhelo ye-bisphenol A (bpa) resin, i-alicyclic epoxy inemiba emininzi elandelayo: umahluko phakathi kwe-A njengekhonkco eliphambili. I-aliphatic, ukusabela nge-asidi ngokukhawuleza, kodwa nge-amine/amides epoxy ephilisa i-epoxy agents edla ngokusetyenziswa ngokusisiseko ayisabeli, ayiqulathanga chlorine, viscosity ye-350 centipoise kunye ne-diglycidyl ether ye-bisphenol A (bpa) resin njenge-11000 centipoise, ngaxeshanye. Ikwanayo nokumelana nemozulu encomekayo.Ukusetyenziswa kwe-viscosity ephantsi ye-aliphatic epoxy kwiingubo ze-UV ze-cationic kuye kwandiswa kakhulu.Kukho iingxelo ezininzi malunga nokulungiswa kunye neempawu zolu hlobo lwe-100% yokwaleka okuqinileyo ngaphandle kwe-"VA", kodwa kukho uncwadi oluneenkcukacha ezimbalwa malunga nesicelo sayo kwi-thermal curing coatings. zisetyenziselwa inkqubo yokunyanga thermal, kodwa ezi zimbini nazo ezahlukeneyo ezifana UV ukutyabeka ngokuqhelekileyo hayi ukutshiza ulwakhiwo, ngoko ke viscosity yokwakha iphezulu kunokutshiza ukutyabeka thermal ukunyanga, kukubhaka uhlobo cationic ukutyabeka amanzi ingasetyenziswa njenge VOC diluent.
Iipolyols ze-Cepolactone zisetyenzisiwe njenge-diluents esebenzayo kwi-solvent-based-coatings kwaye inokukhawulezisa ukunyangwa kwe-cationic UV ye-UV.Amaqela e-hydroxyl ezi polyols kwiingubo ze-cationic ze-UV azikwazi nje ukukhawulezisa ukunyanga, kodwa zikhokelela kubuntununtunu obuthile bokunyanga ukufuma. of polyols kwandisa unyamezelo lwamanzi, ukuze amanzi angasetyenziswa njenge VOC-free thinner thinner kwi ukwakheka kwepeyinti equlunqwe epoxies aliphatic kunye polyols, leyo eneneni eliphezulu eqinileyo ukutyabeka organic ediluted ngamanzi.Dilution Water ineenzuzo ezimbini: viscosity ephantsi kwi ukungabikho kwe-VOC, kunye nokusetyenziswa kwamanyathelo epeyinti aqhelekileyo kunye awaziwayo asekelwe kumanzi okuthintela ukuxhoma kunye nokulawulwa kwe-rheological. Ekubeni icandelo ngalinye kwifomula lixutywe kuphela ngamanzi, ubungakanani bamanzi anokuthi afunxeke bulinganiselwe.Ukunyamekela kufuneka kuthathwe ukuphepha ukongeza amanzi amaninzi ukuze kubangele ukuhlukana kwesigaba.
I-cellulosic thickeners iyasebenza kwi-coatings esekelwe emanzini, kodwa akucaci ukuba iyasebenza kwi-100% eqinile, i-aliphatic epoxy coatings ehlanjululwe ngamanzi. .Uphando lweendlela ezahlukeneyo zokujiyisa lubonisa ukuba izingqimba zeselulosi zinezona mpawu zibalaseleyo.Xa zifudunyezwa ukuya kuma-40 ~ 60℃, inkangeleko entle yefilimu inokufunyanwa ngokufaka umpu wokutshiza.Iqondo lobushushu eliphantsi lolwakhiwo lenza ukuba ifilimu enyangisiweyo ivelise amaxolo e-orenji ngakumbi. Iingcali zombutho we-epoxy resin e-orenji zathi eyona nzuzo iphambili yokugquma ngumgubo iqatywe ngobuchule obuphezulu, ukusebenza kakuhle okuphezulu ikakhulu kukubuyiswa komgubo ukufezekisa, ukugquma komgubo okulingana olu hlobo lolwelo olululwelo lufuna indlela ethile yokubuyisela ipeyinti yempukane. Ekubeni ukwakheka kwepeyinti echazwe apha akuqulathanga izinyibilikisi zendalo ukuze zifumaneke lula, amanzi alahlekileyo kwinkqubo yokubuyisela anokuhlengahlengiswa ngokulula ngokulinganisa ukuhanjiswa kombane xa kuyimfuneko, ukonga amandla ngombane. ifuna amaqondo obushushu asezantsi okubhaka xa kuthelekiswa nobushushu obuphezulu bokubhaka obufunekayo kwi-powder coatings.Enye inketho evavanywayo kukutshiza i-anhydrous epoxies, i-polyols, kunye ne-pigments nge-"Unicarb" indlela, esebenza ngakumbi kunomgubo wokugquma.Ukuba akukho ntlawulo yasimahla ye-VOC efunekayo, yongeza nje izinyibilikisi kwifomula.
Malunga nenqaku lefomula, iingcali zombutho wombutho we-epoxy resin eChina zathi, ukunyanga i-cationic kuba ialkali iya kuyeka ukunyanga, ngoko ke zonke izongezo kunye neearhente zolawulo lwerheological kufuneka zingaqulathi ialkaline, iipigments zealkaline kunye neepigments eziphathwayo ziya kuthintela ukuphilisa. kwakhona inhibit ukunyanga cationic, pigments alkaline kunye nezongezelelo kwi cationic ukunyanga ukutyabeka ayikwazi ukusetyenziswa, ukunyanga kuxhomekeke catalyst FC-520 kumlinganiselo omncinci amine sealant volatilization, ukuba ifilimu ingqindilili kakhulu okanye i-oven ayifakwanga umoya, i-amine ayinakususwa ngokupheleleyo kwifilimu kwaye inqanda ukunyanga.I-Viscosity yanda ngokunyuka kwe-polyols branched degree yokwanda: utywala lwe-dibasic kune-yuan ezintathu okanye ezine zengeniso ephantsi ye-viscosity yepeyinti, utywala kunye ne-glycol ukwabelana ngesidingo sokwandisa ixabiso le-epoxy ( R) inokufunyanwa ngokutyabeka okuqinileyo, idosi ephezulu ye-epoxy corrosion inokuphuculwa, ukonyuka kwedosi ye-catalyst kunokukhawulezisa isantya sokunyanga kodwa kunokunciphisa umhlwa, umlinganiselo we-molar we-epoxy kunye ne-hydroxyl R inempembelelo enkulu kwisantya sokunyanga. .
Nangona kunjalo, i-alicyclic epoxy ene-caprolactone polyols i-viscosity ephantsi kwaye ayinayo i-VOC yokugquma, i-coating inokuhlanjululwa ngamanzi ukutshiza i-viscosity, i-cellulose thickener inokunika amanzi okuxutywa kwe-100% epoxy eqinile kunye ne-polyols yokugqoka ukukhusela ngokufanelekileyo ukugoba, inkqubo yokunyanga isantya. kugqitywe ngezi ziguquko zilandelayo: umlinganiselo we-molar we-epoxy kunye ne-hydroxyl, utywala obuninzi kunye nokusebenza kwe-epoxy, i-dosage ye-catalyst kunye neqondo lokushisa lokunyanga, i-formula inokusetyenziswa ngokulula ekulungiseleleni ipeyinti, kuba olu hlobo lokugquma lwe-cationic. ukunyanga ipeyinti esisiseko kunye ne-substrate inokuthintela ukunyanga.
Ixesha lokuposa: Apr-06-2021