Kuyamba kwa UV absorber

Kuwala kwa Dzuwa kuli ndi kuwala kochuluka kwa ultraviolet komwe kumawononga zinthu zamitundumitundu. Kutalika kwake ndi pafupifupi 290 ~ 460nm. Kuwala koyipa kwa ultraviolet kumeneku kumapangitsa kuti mamolekyu amtunduwo awole ndikuzimiririka chifukwa cha kuchepa kwa ma oxidation. Kugwiritsa ntchito ma ultraviolet absorbers kumatha kuteteza kapena kufooketsa kuwonongeka kwa cheza cha ultraviolet ku zinthu zotetezedwa.

UV absorber ndi stabilizer yowunikira yomwe imatha kuyamwa mbali ya ultraviolet ya dzuwa ndi magwero a kuwala kwa fulorosenti popanda kudzisintha yokha. Pulasitiki ndi zinthu zina za polima zimapanga auto-oxidation reactions pa kuwala kwa dzuwa ndi fluorescence chifukwa cha zochita za cheza ultraviolet, zomwe zimabweretsa kuwonongeka ndi kuwonongeka kwa ma polima, ndi kuwonongeka kwa maonekedwe ndi makina katundu. Pambuyo powonjezera zotsekemera za UV, kuwala kwamphamvu kwa ultraviolet kumeneku kumatha kutengeka mwachisawawa, ndikusandulika kukhala mphamvu zopanda vuto ndikumasulidwa kapena kudyedwa. Chifukwa cha mitundu yosiyanasiyana ya ma polima, kutalika kwa mafunde a kuwala kwa ultraviolet komwe kumawapangitsa kuti awonongeke kumakhala kosiyana. Zotengera zosiyanasiyana za UV zimatha kuyamwa kuwala kwa ultraviolet kwamafunde osiyanasiyana. Mukamagwiritsa ntchito, zotengera za UV ziyenera kusankhidwa molingana ndi mtundu wa polima.

Mitundu ya UV absorber

Mitundu yodziwika bwino ya zotsekemera za UV ndi monga: benzotriazole (mongaMphamvu ya UV 327), benzophenone(mongaMphamvu ya UV 531triazine (mongaChotsitsa cha UV 1164), ndi kulepheretsa amine(mongaLight Stabilizer 622).

Benzotriazole UV absorbers panopa ambiri ankagwiritsa ntchito zosiyanasiyana mu China, koma ntchito zotsatira za triazine UV absorbers ndi bwino kwambiri kuposa benzotriazole. Mafuta a Triazine ali ndi mphamvu zabwino kwambiri zoyamwa UV ndi ubwino wina. Atha kugwiritsidwa ntchito kwambiri mu ma polima, amakhala ndi bata labwino kwambiri lamafuta, kukhazikika kwabwino kwa kukonza, komanso kukana asidi. M'malo ogwiritsira ntchito, zotsekemera za triazine UV zimakhala ndi zotsatira zabwino zogwirizanitsa ndi zolepheretsa kuwala kwa amine. Ziwirizi zikagwiritsidwa ntchito palimodzi, zimakhala ndi zotsatira zabwino kuposa zomwe zimagwiritsidwa ntchito paokha.

Zambiri zowoneka bwino za UV

(1)UV-531
Kuwala chikasu kapena woyera crystalline ufa. Kachulukidwe 1.160g/cm³ (25℃). Malo osungunuka 48 ~ 49 ℃. Kusungunuka mu acetone, benzene, ethanol, isopropanol, kusungunuka pang'ono mu dichloroethane, osasungunuka m'madzi. Kusungunuka mu zosungunulira zina (g/100g, 25℃) ndi acetone 74, benzene 72, methanol 2, ethanol (95%) 2.6, n-heptane 40, n-hexane 40.1, madzi 0.5. Monga chotengera cha UV, chimatha kuyamwa mwamphamvu kuwala kwa ultraviolet ndi kutalika kwa 270 ~ 330nm. Angagwiritsidwe ntchito mapulasitiki osiyanasiyana, makamaka polyethylene, polypropylene, polystyrene, ABS utomoni, polycarbonate, polyvinyl kolorayidi. Zimagwirizana bwino ndi ma resins komanso kusinthasintha kochepa. Mlingo wamba ndi 0.1% ~ 1%. Zili ndi zotsatira zabwino za synergistic zikagwiritsidwa ntchito ndi zochepa za 4,4-thiobis (6-tert-butyl-p-cresol). Izi zitha kugwiritsidwanso ntchito ngati stabilizer yowunikira pazoyala zosiyanasiyana.

(2)UV-327
Monga choyatsira UV, mawonekedwe ake ndi ntchito zake ndizofanana ndi benzotriazole UV-326. Imatha kuyamwa mwamphamvu kuwala kwa ultraviolet ndi kutalika kwa 270 ~ 380nm, imakhala ndi kukhazikika kwamankhwala komanso kutsika kochepa kwambiri. Zimagwirizana bwino ndi ma polyolefins. Ndizoyenera makamaka polyethylene ndi polypropylene. Komanso, angagwiritsidwe ntchito polyvinyl kolorayidi, polymethyl methacrylate, polyoxymethylene, polyurethane, unsaturated poliyesitala, ABS utomoni, epoxy utomoni, mapadi utomoni, etc. Mankhwalawa ali kwambiri kukana kutentha sublimation, kutsuka kukana, mpweya kuzirala kukana ndi makina posungira katundu. Imakhala ndi synergistic kwenikweni ikagwiritsidwa ntchito limodzi ndi antioxidants. Amagwiritsidwa ntchito popititsa patsogolo kukhazikika kwamafuta oxidation azinthu.

(3)UV-9
Kuwala chikasu kapena woyera crystalline ufa. Kachulukidwe 1.324g/cm³. Malo osungunuka 62 ~ 66 ℃. Malo otentha 150 ~ 160 ℃ (0.67kPa), 220 ℃ (2.4kPa). Amasungunuka mu zosungunulira zambiri za organic monga acetone, ketone, benzene, methanol, ethyl acetate, methyl ethyl ketone, ethanol, koma osasungunuka m'madzi. Kusungunuka mu zosungunulira zina (g/100g, 25℃) ndi zosungunulira benzene 56.2, n-hexane 4.3, ethanol (95%) 5.8, carbon tetrachloride 34.5, styrene 51.2, DOP 18.7. Monga UV absorber, ndi oyenera zosiyanasiyana mapulasitiki monga polyvinyl kolorayidi, polyvinylidene kolorayidi, polymethyl methacrylate, unsaturated poliyesitala, ABS utomoni, mapadi utomoni, etc. The pazipita mayamwidwe wavelength osiyanasiyana ndi 280 ~ 340nm, ndipo ambiri mlingo% ~ 1.51%. Ili ndi kukhazikika kwabwino kwa kutentha ndipo sikuwola pa 200 ℃. Izi sizimatengera kuwala kowoneka bwino, kotero ndizoyenera kuzinthu zowoneka bwino zowala. Izi zitha kugwiritsidwanso ntchito mu utoto ndi mphira wopangira.