Ukusebenza Okufanelekile Kwezingubo Zempushana ye-UV

I-Powder enamathela welashwe ukukhanya kwe-ultraviolet (i-UV powder coating) ubuchwepheshe obuhlanganisa izinzuzo ze-thermosetting powder coating kanye nobuchwepheshe bokugcoba i-ultraviolet-cure coating. Umehluko kusukela ekugcotshweni kwempushana okujwayelekile ukuthi ukuncibilika kanye nokwelapheka kuhlukaniswa kube izinqubo ezimbili ezihlukene: lapho uchayeka ekushiseni, izinhlayiya ezimboze ngempushana ekwazi ukuphulukiswa yi-UV ziyancibilika futhi zigeleze zibe ifilimu ehambisanayo ephambana kuphela lapho ivezwe ekukhanyeni kwe-UV. Indlela edume kakhulu yokuxhumanisa esetshenziselwa lobu buchwepheshe inqubo ye-radical yamahhala: ukwenziwa kusebenze kwama-photoinitiators efilimu elincibilikisiwe ngokukhanya kwe-UV kubangela ukwakheka kwama-radicals mahhala aqala ukusabela kwe-polymerization okubandakanya amabhondi aphindwe kabili e-resin.

Isici sokugcina sokumboza nokusebenza kuncike ekukhethweni kwezinhlelo ze-resin, ama-photoinitiators, ama-pigments, izigcwalisi, izithasiselo, izimo zenqubo yokumboza impushana kanye nemingcele yokwelapha. Ukusebenza kahle kwe-crosslinking kokwakheka okuthile nezimo zokwelapha kungahlolwa kusetshenziswa i-photocalorimetry ehlukile.

Ukwenziwa kahle kwakamuva kwezingubo zempushana ye-UV kuphumele ekuphumeni okuhle kakhulu, okwenza ukuqedwa okubushelelezi kufinyeleleke emazingeni okushisa aphansi njengo-100 °C. Izinzuzo zobuchwepheshe nezomnotho zichaza isithakazelo esikhulayo kubuchwepheshe bempushana ye-UV.

Inhlanganisela ye-polyester ne-epoxy chemistries eyenzelwe izimpushana ze-UV ivumela izidingo eziyinselele zezingxenye zemakethe ezifana nokhuni, inhlanganisela yokhuni, ipulasitiki nensimbi ukuthi kuhlangatshezwane nayo ngokugcwele. Nakuba "izimpushana ezixubile" ezihlanganisa i-polyester ne-epoxy resins zaziwa iminyaka engaphezu kwengu-20 kuzimpushana ze-thermosetting, izinga lokwelapha elitholakala emazingeni okushisa aphansi (isb., 120 °C) liba "lihle ngokwanele" kuphela ngemva kwesikhathi eside sokwelapha. Ngokuphambene, amafilimu okumboza ngempushana aphethwe yi-UV agcwalisa ukucaciswa okuqinile ngemuva “kwemizuzu embalwa” ngaphansi kokushisa nokukhanya kwe-UV.