isizinzi sokukhanya
Izinzisi zokukhanya zisetyenziselwa ukukhusela iiplastiki kunye nezinye izinto ekonakalisweni{0}}kuvelo lwexesha elide kwimitha yeultraviolet. Ukuvezwa kweeplastiki kwimitha ye-ultraviolet evela ekukhanyeni kwelanga kuqalisa ukuthotywa ngenkqubo ye-photooxidation. Oku kunokuba nenani leempembelelo ezingathandekiyo ezibandakanya utshintsho kwimbonakalo (i-discoloration, i-gloss change kunye / okanye i-chalking), ukunciphisa iimpawu zomatshini kunye nokwakheka kweziphene ezibonakalayo ezifana nokuqhekeka. Izibane zeFluorescent ezisetyenziselwa izibane zangaphakathi nazo zikhupha imitha ye-UV, kodwa kumanqanaba asezantsi kakhulu kunokukhanya kwelanga.
Njengakwimeko ye-oxidation ye-thermal, i-photooxidation yinkqubo ye-chain reaction ebandakanya i-radicals yamahhala kunye ne-hydroperoxide intermediates. Iifotostabilizers ziyayithintela le nkqubo ngokukhupha imidibaniso esebenzayo okanye ngokukhuphisana ngokufunxa imitha eyingozi yeUV.
Ukuthintelwa kwe-amine light stabilizers (HALS) ikakhulu zisebenza ngokukhupha i-free radical intermediates kwinkqubo ye-photooxidation. I-HALS iyasebenza kakhulu ekuzinzisweni kokukhanya kweepolyolefins, iipholima zestyrenic kunye nezinye iiplastiki zobunjineli.
Izixhobo zokufunxa i-Ultraviolet (UV) zisebenza ngokukhusela ingaphakathi leenxalenye zeplastiki kwimitha ye-UV eyonakalisayo. Ezi mveliso ziphawulwa ngokufunxa okunamandla kakhulu kwe-UV kunye nenqanaba eliphezulu lefotostability yendalo. I-Absorber ye-UV iyasebenza ekuzinziseni iiplastiki ezininzi, kuquka i-PVC kunye neeplastiki zobunjineli. Zikwasetyenziswa kwizicelo zokupakisha zeplastiki ukukhusela iziqulatho zepakethe kwimitha ye-UV.
Udibaniso lwe-HALS kunye ne-Absorbe ye-UV kaninzi ibonisa ukusebenza kwe-synergistic ngaphezu kokuzinza kokukhanya kuphela.
