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苯并三唑类紫外线吸收剂的现状及发展趋势 总被引:8,自引:1,他引:7
综述了不同种类的紫外线吸收剂,着重介绍了苯并三唑类紫外线吸收剂。苯并三唑类紫外线吸收剂由于性能优异而广泛应用于各种高分子合成材料和制品中。但由于其相对分子质量较小,在高分子材料加工过程中,容易通过向表面迁移、表面挥发而引起损失,所以其耐光性比较差。在苯并三唑类紫外线吸收剂分子中引入可聚合的基团使它可以和不同的单体聚合成高分子化合物。从共价键到聚合物链的转变使其在介质中更稳定,更不易迁移和挥发。含有可聚合基团的紫外线吸收剂相比普通的紫外线吸收剂显示出了相当优良的耐光稳定性。 相似文献
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反应性紫外线吸收剂研究进展 总被引:3,自引:0,他引:3
对纺织品进行功能整理是提高其附加值的重要环节,反应性紫外线吸收剂可有效改善纺织品的紫外线防护能力。针对现有反应性紫外线吸收剂的国内外发展现状和趋势,详细介绍了二苯甲酮类、苯并三唑类、三嗪类、受阻胺类及其他类反应性紫外线吸收剂的制备过程和应用情况,并对它们的应用前景进行了展望。 相似文献
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《精细化工原料及中间体》2014,(9)
正紫外线吸收剂是光稳定剂中一类重要品种。其中,苯并三唑类紫外线吸收剂具有性能稳定,毒性低,吸收紫外线能力强,能够抑制或减弱光降解作用,提高合成材料的耐光性能,与高分子材料相容性好,广泛地应用于聚烯烃、聚酯树脂、涂料、食品包装、感光材料等各种合成材料制品中。苯并三唑类紫外线吸收剂的合成方法是:重氮化、偶合、还原。前两步是较成熟的工艺,而还原方法有很多种。还原剂有:锌粉、氢气、葡萄糖、醇类、甲醛、聚甲醛、 相似文献
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透明玻璃钢的老化性能研究 总被引:1,自引:0,他引:1
本文通过人工加速老化方法,研究了各种稳定剂及组合稳定剂对透明玻璃钢透光率的影响。试验结果表明,苯并三唑类紫外线吸收剂比二苯甲酮类紫外线吸收剂对透明玻璃钢有更好的防老化效果。某些组合稳定剂能产生协同作用,有效地改善了玻璃钢的耐老化性能。 相似文献
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苯并三唑类紫外线吸收剂的研究进展 总被引:3,自引:0,他引:3
论述了应用最广泛的紫外线吸收剂苯并三唑类化合物在提高消光系数、引入可聚合基团以及和其它光稳定剂如受阻胺光稳定剂的协同作用等方面的研究进展。 相似文献
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Many new speciality polymers have been developed in the last few years. In this paper polymeric stabilizers (antioxidants, flame retardants and ultraviolet stabilizers) will be discussed. Polymeric antioxidants of the hindered-phenol type, copolymers of 2,6-ditertiarybutyl-4-vinyl(or isopropenyl)phenol with styrene, methyl methacrylate, or more importantly butadiene or isoprene have been prepared; hydrogenation of the latter copolymers gave copolymers of the two polymerizable phenolic antioxidants with ethylene or ethylene/propylene. The polymeric antioxidants have been blended with diene polymers and selected polyolefins and have improved the long-term oxidative stability of these polymers. Polymeric flame retardants have been prepared by copolymerizing styrene and/or acrylonitrile with acrylates and methacrylates of aliphatic bromine-containing alcohols or bromine-containing phenols. Polymers with polymer-bound flame retardants have a higher limiting oxygen index compared with the original polymer. A new class of polymerizable ultraviolet stabilizers has also been developed; these stabilizers are styryl, α-methylstyryl, acryloyl and methacryloyl derivatives of 2(2-hydroxyphenyl)2H-benzotriazoles. These monomers have been copolymerized with styrene, acrylates and methacrylates. 2(2-Hydroxyphenyl)2H-benzotriazoles substituted in the 4 position of the benzotriazole ring with hydroxyl, acetoxy or carboxyl groups suitable for incorporation into polyesters, polycarbonates, polyamides and epoxy resins have also been synthesized. All 2(2-hydroxyphenyl)2H-benzotriazole ultraviolet absorbers and the polymers into which they are incorporated have high light absorbency with γmax between 330 and 350 nm and extinction coefficients in some cases as high as 4.5 × 104 1 mol?1 cm?1. 相似文献
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含受阻胺结构的苯并三唑光稳定性和热稳定性研究 总被引:3,自引:0,他引:3
测试了4种2-[2’-羟基-3’-叔丁基-5’-(3-丙酸-4-哌啶酯基)苯基]-2H-苯并三唑结构类光稳定剂紫外吸收光谱、光稳定性及热稳定性。4种化合物在270~400nm均有较强的吸收峰,与引入受阻胺结构前苯并三唑光稳定剂相比.紫外吸收波长和摩尔消光系数不变。4种化合物的光稳定性和热稳定性明显高于引入受阻胺结构前的苯并三唑光稳定剂。光老化12h后,4种化合物仅分解3.2%~6.9%,引入受阻胺结构前苯并三唑则分解35.0%~36.3%。热稳定性测试表明。4种化合物失重1%时的温度为264~272℃.而引入受阻胺结构前苯并三唑失重1%时的温度分别为227℃和235℃。该类化合物分子内同时具有紫外吸收剂和自由基捕获剂两种功能,为高效光稳定剂。 相似文献
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以酯基间有2~6个碳原子的聚酯二元醇(CMA-24、CMA-44、CMA-254、CMA-66)、甲苯二异氰酸酯和扩链剂3,5-二甲硫基甲苯二胺(DMTDA)为原材料,通过预聚体法制备了一种耐水解聚酯型聚氨酯弹性体。探讨了水解稳定剂、防酶剂、紫外线吸收剂和抗氧剂等助剂对聚氨酯弹性体性能的影响,测定了耐水解聚酯型聚氨酯弹性体的耐湿热老化和耐海水性能。结果表明,通过添加适量的水解稳定剂、防霉剂、紫外线吸收剂和抗氧剂可大幅度提高聚酯型聚氨酯弹性体的耐湿热老化和耐紫外线老化性能,特别是耐海水性能较传统的聚酯型聚氨酯弹性体提高了5倍以上。 相似文献
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The UV-light exposure of natural wood leads initially to a fast color change, and in the further stages to large chemical modifications and mechanical breakdown of the wood surface layer. Even in diffuse light exposure, prevailing in indoor conditions, the discoloration of wood is a serious esthetical drawback, for example, for furniture and parquetry.
Progress has been made with the development of new stabilizers, which offer a significant benefit compared to the currently used benzotriazole UV-absorbers. Using these new stabilizers the wood photo-protection against discoloration and the durability of clear and transparent pigmented coating systems can be significantly improved. 相似文献
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Vladimir Bojinov 《应用聚合物科学杂志》2006,102(3):2408-2415
The influence of combined 2,2,6,6‐tetra methylpiperidine ? 2‐hydroxyphenyl‐benzotriazole [1,3,5]triazine polymerizable stabilizers on the photostability of their copolymers with methyl methacrylate as well as the interaction of the photoreactive HALS and UV absorber fragments in the combined molecules have been studied. Chemical bonding of the stabilizers in the polymer was confirmed spectrophotometrically. The participation of the combined stabilizers in the polymerization did not affect considerably the molecular weight and the molecular weight distribution of the copolymers. A significant stabilizing effect against photodegradation was determined. Strong synergistic interaction between different HALS and UV absorber fragment in the combined stabilizers was established. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2408–2415, 2006 相似文献