Emhlophe, eqaqambileyo, elula, enyulu, ebonisa ubunyulu.
Abantu abaninzi bathanda izinto ezimhlophe, kwaye iimpahla zabathengi zihlala zenziwe ezimhlophe. Ngokuqhelekileyo, abantu abathenga izinto ezimhlophe okanye abanxibe iimpahla ezimhlophe baya kuqaphela ukuba bangavumeli umhlophe ukuba ufumane nayiphi na ibala. Kodwa kukho ingoma ethi, “Kweli hlabathi likhawulezayo, yala ngonaphakade.” Kungakhathaliseki ukuba ungakanani umgudu owenzayo ukugcina ezi zinto zingangcoliswa, ziya kuthi chu zijike zibe tyheli ngokwazo. Kangangeveki, unyaka, okanye iminyaka emithathu, unxiba ikesi ye-headphone ukuze usebenze yonke imihla, kwaye ihempe emhlophe ongayinxibanga kwi-wardrobe ithe cwaka ijika ibe tyheli ngokwakho.
Ngapha koko, ukutyheli kweentsinga zempahla, i-elastic shoe soles, kunye neebhokisi ze-headphone zeplastiki kukubonakalisa ukuguga kwe-polymer, eyaziwa ngokuba yi-yellowing. I-Yellowing ibhekisela kwinto yokuthotywa, ukulungiswa ngokutsha, okanye ukudibanisa kwiimolekyuli zeemveliso zepolymer ngexesha lokusetyenziswa, okubangelwa ukushisa, ukukhanya kwemitha, i-oxidation, kunye nezinye izinto, ezikhokelela ekwakhiweni kwamaqela athile anemibala.
La maqela anemibala adla ngokuba yi-carbon carbon double bonds (C = C), amaqela e-carbonyl (C = O), amaqela e-imine (C = N), njalo njalo. Xa inani le-conjugated carbon carbon bonds lifikelela kwi-7-8, zihlala zibonakala ziphuzi. Ngokuqhelekileyo, xa uqaphela ukuba iimveliso zepolymer ziqala ukujika ziphuzi, izinga le-yellowing livame ukunyuka. Oku kungenxa yokuba ukuthotywa kwee-polymers kukusabela kwekhonkco, kwaye yakuba inkqubo yokuthotywa iqalile, ukuqhekeka kwamatyathanga eemolekyuli kufana ne-domino, kunye neyunithi nganye iwela enye.
Kukho iindlela ezininzi zokugcina izinto ezimhlophe. Ukongeza i-titanium dioxide kunye ne-fluorescent whitening agents inokuphucula ngokufanelekileyo umphumo wobumhlophe bezinto eziphathekayo, kodwa ayikwazi ukuthintela izinto ekubeni ziphuzi. Ukunciphisa i-yellowing ye-polymers, i-stabilizers yokukhanya, i-absorber ekhanyayo, i-agent ecimayo, njl. Ezi ntlobo zezongezo zinokufunxa amandla athwalwa kukukhanya kwe-ultraviolet ekukhanyeni kwelanga, ukubuyisela i-polymer kwisimo esizinzileyo. Kwaye ii-anti-thermal oxidants zinokubamba iiradicals zasimahla ezenziwe yi-oxidation, okanye zithintele ukuthotywa kwamatyathanga epolymer ukuphelisa ukusabela kwekhonkco lokuthotywa kwe-polymer chain. Izixhobo zinobude bokuphila, kwaye izongezo zinobomi. Nangona izongezo zinokucothisa ngokufanelekileyo isantya sepolymer yellowing, zona ngokwazo ziya kusilela kancinci ngexesha lokusetyenziswa.
Ukongeza ekongezeni izongezo, kunokwenzeka ukuba uthintele i-polymer yellowing ukusuka kweminye imiba. Ngokomzekelo, ukunciphisa ukusetyenziswa kwezixhobo kwiqondo lokushisa eliphezulu kunye neendawo ezikhanyayo zangaphandle, kuyimfuneko ukusebenzisa i-coat lighting coating kwizinto xa uzisebenzisa ngaphandle. I-Yellowing ayichaphazeli nje inkangeleko, kodwa ikwasebenza njengomqondiso wokuthotywa komgangatho wokusebenza koomatshini okanye ukusilela! Xa izinto zokwakha ziba tyheli, izinto ezintsha ezibambeleyo kufuneka zitshintshwe ngokukhawuleza.
Ixesha lokuposa: Dec-20-2023