Ukusebenza ngokuLungileyo kweeNgqungquthela zePowder ye-UV

Ukupheka kwindoda unyangwa kukukhanya kweultraviolet (UV powder coating) bubuchwephesha obudibanisa iingenelo zokugquma komgubo we-thermosetting kunye nezo zetekhnoloji yolwelo ye-ultraviolet-yokunyanga. Umahluko ukusuka ekugqunyweni komgubo oqhelekileyo kukuba ukunyibilika kunye nokunyanga zohlulwe zibe ziinkqubo ezimbini ezahlukeneyo: ekuvezweni kobushushu, amasuntswana omgubo otyabekayo we-UV anyangekayo ayanyibilika aze aqukuqelele kwifilimu edityanisiweyo edityaniswe kuphela xa ibhengezwe kukukhanya kwe-UV. Eyona ndlela idumileyo yokuphambanisa esetyenziswa kobu buchwepheshe yinkqubo ye-radical yasimahla: ukusebenza kweefotoinitiators kwifilimu etyhidiweyo ngokukhanya kwe-UV kukhokelela ekwakhiweni kweeradicals zasimahla eziqalisa ukusabela kwepolymerization ebandakanya i-resin double bonds.

Umgangatho wokugqibela wokugquma kunye nokusebenza kuxhomekeke ekukhethweni kweenkqubo ze-resin, ii-photoinitiators, ii-pigments, ii-fillers, izongezo, iimeko zokugquma umgubo kunye neeparitha zokunyanga. Ukusebenza kwe-crosslinking yeendlela ezithile kunye neemeko zonyango zinokuvavanywa ngokusebenzisa i-photocalorimetry eyahlukileyo.

Ukulungiswa kwamva nje kweengubo zomgubo ze-UV kubangele ukuphuma kakuhle kakhulu, ukwenza ukugqiba okugudileyo kufezeke kumaqondo obushushu asezantsi njenge-100 °C.Iinzuzo zobuchwepheshe kunye nezoqoqosho zichaza umdla okhulayo kwiteknoloji ye-UV powder.

Indibaniselwano yepolyester kunye ne-epoxy chemistries ephuhliselwe umgubo we-UV ivumela iimfuno ezicela umngeni kumacandelo emarike anje ngamaplanga, indibaniselwano yomthi, iplastiki kunye nentsimbi ukuba ifezekiswe ngokupheleleyo. Nangona “umgubo oxutyiweyo” odibanisa i-polyester kunye ne-epoxy resins zaziwa ngaphezu kweminyaka engama-20 kumgubo we-thermosetting, iqondo lokunyanga eliphunyezwa kumaqondo obushushu aphantsi (umz., 120 °C) liba “lilunge ngokwaneleyo” kuphela emva kwexesha elide lokunyanga. Ngokwahlukileyo, iifilimu ezigqunywe ngumgubo we-UV zizalisekisa ezona nkcukacha zingqongqo emva "kwemizuzu embalwa" phantsi kobushushu kunye nokukhanya kwe-UV.