Taw qhia txog UV absorber

Lub hnub ci muaj ntau lub teeb ultraviolet uas tsim kev puas tsuaj rau cov khoom xim. Nws wavelength yog hais txog 290 ~ 460nm. Cov teeb meem ultraviolet rays no ua rau cov xim molecules decompose thiab ploj mus los ntawm cov tshuaj oxidation-txo cov tshuaj tiv thaiv. Kev siv cov ultraviolet absorbers tuaj yeem tiv thaiv lossis ua kom tsis muaj zog ntawm cov hluav taws xob ultraviolet rau cov khoom tiv thaiv.

UV absorber yog lub teeb stabilizer uas tuaj yeem nqus cov ultraviolet ib feem ntawm lub hnub ci thiab lub teeb fluorescent yam tsis hloov nws tus kheej. Plastics thiab lwm yam ntaub ntawv polymer tsim auto-oxidation cov tshuaj tiv thaiv nyob rau hauv tshav ntuj thiab fluorescence vim qhov kev ua ntawm ultraviolet rays, uas ua rau degradation thiab deterioration ntawm polymers, thiab deterioration ntawm tsos thiab txhua yam khoom. Tom qab ntxiv UV absorbers, lub teeb muaj zog ultraviolet no tuaj yeem raug xaiv absorbed, tig mus rau hauv lub zog tsis muaj zog thiab tso tawm lossis noj. Vim muaj ntau hom polymers, lub wavelengths ntawm ultraviolet rays uas ua rau lawv deteriorate kuj txawv. Txawv UV absorbers tuaj yeem nqus tau cov kab hluav taws xob ultraviolet ntawm cov wavelengths sib txawv. Thaum siv, UV absorbers yuav tsum raug xaiv raws li hom polymer.

Hom ntawm UV absorber

Cov hom UV absorbers muaj xws li: benzotriazole (xws liUV absorber 327), benzophenone (xws liUV absorber 531), triazine (xws liUV absorber 1164), thiab hindered amine (xws liLub teeb Stabilizer 622).

Benzotriazole UV absorbers yog tam sim no siv ntau yam nyob rau hauv Tuam Tshoj, tab sis daim ntawv thov cov nyhuv ntawm triazine UV absorbers yog ho zoo dua li ntawm benzotriazole. Triazine absorbers muaj cov khoom zoo heev UV nqus thiab lwm yam zoo. Lawv tuaj yeem siv dav hauv cov polymers, muaj cov thermal stability zoo, kev ua haujlwm zoo, thiab cov kua qaub tsis kam. Nyob rau hauv kev siv tswv yim, triazine UV absorbers muaj ib tug zoo synergistic nyhuv nrog hindered amine teeb stabilizers. Thaum ob qho tib si siv ua ke, lawv muaj txiaj ntsig zoo dua li thaum lawv siv ib leeg.

Feem ntau pom UV absorbers

(1)UV-531
Lub teeb daj lossis dawb crystalline hmoov. Qhov ceev 1.160g / cm³ (25 ℃). Melting point 48 ~ 49 ℃. Soluble hauv acetone, benzene, ethanol, isopropanol, me ntsis soluble hauv dichloroethane, insoluble hauv dej. Solubility hauv qee cov kuab tshuaj (g / 100g, 25 ℃) yog acetone 74, benzene 72, methanol 2, ethanol (95%) 2.6, n-heptane 40, n-hexane 40.1, dej 0.5. Raws li UV absorber, nws muaj peev xwm nqus tau ultraviolet lub teeb nrog lub wavelength ntawm 270 ~ 330nm. Nws tuaj yeem siv ntau yam yas, tshwj xeeb tshaj yog polyethylene, polypropylene, polystyrene, ABS resin, polycarbonate, polyvinyl chloride. Nws muaj zoo compatibility nrog resins thiab tsawg volatility. Qhov dav dav npaum li cas yog 0.1% ~ 1%. Nws muaj cov nyhuv synergistic zoo thaum siv nrog me me ntawm 4,4-thiobis (6-tert-butyl-p-cresol). Cov khoom no kuj tseem siv tau los ua lub teeb stabilizer rau ntau yam txheej txheej.

(2)UV-327
Raws li UV absorber, nws cov yam ntxwv thiab kev siv zoo ib yam li cov benzotriazole UV-326. Nws muaj peev xwm nqus tau ultraviolet rays nrog lub wavelength ntawm 270 ~ 380nm, muaj tshuaj lom neeg ruaj khov thiab tsis tshua muaj volatility. Nws muaj kev sib raug zoo nrog polyolefins. Nws yog tshwj xeeb tshaj yog haum rau polyethylene thiab polypropylene. Tsis tas li ntawd, nws kuj tseem siv tau rau polyvinyl chloride, polymethyl methacrylate, polyoxymethylene, polyurethane, unsaturated polyester, ABS resin, epoxy resin, cellulose resin, thiab lwm yam. Nws muaj cov nyhuv synergistic tseem ceeb thaum siv ua ke nrog antioxidants. Nws yog siv los txhim kho cov thermal oxidation stability ntawm cov khoom.

(3)UV-9
Lub teeb daj lossis dawb crystalline hmoov. Qhov ceev 1.324g / cm³. Melting point 62 ~ 66 ℃. Kub taw tes 150 ~ 160 ℃ (0.67 kPa), 220 ℃ (2.4 kPa). Soluble nyob rau hauv feem ntau organic solvents xws li acetone, ketone, benzene, methanol, ethyl acetate, methyl ethyl ketone, ethanol, tab sis insoluble nyob rau hauv dej. Cov solubility hauv qee cov kuab tshuaj (g / 100g, 25 ℃) yog hnyav benzene 56.2, n-hexane 4.3, ethanol (95%) 5.8, carbon tetrachloride 34.5, styrene 51.2, DOP 18.7. Raws li UV absorber, nws yog tsim rau ntau yam yas xws li polyvinyl chloride, polyvinylidene chloride, polymethyl methacrylate, unsaturated polyester, ABS resin, cellulose resin, thiab lwm yam. Qhov siab tshaj plaws nqus wavelength yog 280 ~ 340nm, thiab qhov ntau npaum li cas yog 0.5% ~ 1. Nws muaj qhov zoo thermal stability thiab tsis decompose ntawm 200 ℃. Cov khoom no tsis tshua pom lub teeb pom kev, yog li nws tsim nyog rau cov khoom siv pob tshab xim. Cov khoom no kuj tseem siv tau rau hauv cov xim thiab hluavtaws roj hmab.