共查询到20条相似文献,搜索用时 98 毫秒
1.
受阻胺光稳定剂和抗氧剂并用对聚合物紫外光稳定性的影响 总被引:1,自引:0,他引:1
阐述了受阻胺稳定剂(HALS)和抗氧剂的分类和作用机理,重点介绍了受阻胺类光稳定剂和抗氧剂并用对聚合物紫外光降解中的影响。当受阻胺类光稳定剂和抗氧剂并用时,既有协同效应,又有对抗效应,也有加和效应。这依赖于受阻胺类光稳定剂和抗氧剂的种类。同时介绍受阻胺光稳定剂发展的趋势。 相似文献
2.
通过受阻胺、二苯甲酮、苯并三唑及镍螯合物对聚乙烯、聚丙烯及苯乙烯聚合物等的紫外光稳定作用的比较,说明受阻胺是一种高效光稳定剂,当与上述光稳定剂合用时,能收到协同加强效果。对我国研制的受阻胺稳定剂作了介绍。 相似文献
3.
受阻胺光稳定剂对PP织物抗热老化性能的影响 总被引:2,自引:0,他引:2
研究受阻胺光稳定剂对聚丙烯(PP)织物抗热老化性能的影响。受阻胺光稳定剂不仅具有优异的光稳定作用,还具有良好的热稳定作用,对PP织物的长期抗热老化作用显著;当酚类抗氧剂与受阻胺光稳定剂以1∶3的比例组合使用时,达到最佳的配合效果。 相似文献
4.
5.
综述了农用棚膜耐老化体系发展概况 ,重点阐述了高分子量聚合型受阻胺光稳定剂与复合型抗氧剂、复合聚合型受阻胺光稳定剂与复合抗氧剂组成的聚烯烃棚膜耐老化体系及其应用效果 ,简要介绍了抗农药型受阻胺光稳定剂开发应用情况 ,并对光学性能稳定化的研究提出了看法。 相似文献
6.
7.
8.
受阻胺光稳定剂是国内塑料助剂生产和应用增长最快的品种。多年来,光稳定剂的产量和用量年平均增长率为 25%。受阻胺光稳定剂主要用途是耐老化农用大棚膜,其他也用于聚乙烯厚制品、聚丙烯编织袋和工 相似文献
9.
10.
本文用力学性能、热天平、红外光谱等方法,比较了七种新型受阻胺光稳定剂的稳定效率,结果表明PDS效果较好,770效果较差,GW-540居中。讨论了结构与光稳定效率之间的关系,并提出了三条提高受阻胺光稳定化效率的途径。 相似文献
11.
New polymerizable urethane functional monomers containing hindered amine (III, III′) and their copolymers with styrene (S) and methyl methacrylate (MMA) are characterized and tested as hindered amine light stabilizers (HALS). Experimental results indicated that the monomers possess high photostabilizing effectiveness comparable to that of Tinuvin 770 and Tinuvin 765. Their copolymers with S and MMA showed lower photostabilizing effectiveness mainly due to the low hindered amine content in the copolymers. The copolymers, however, showed very high resistance to liquid extraction. UV and ESR analyses indicate that the photostabilizing mechanism of these HALS is through the scavenging action of nitroxyl radicals formed from degradation of the substrate polymer. © 1993 John Wiley & Sons, Inc. 相似文献
12.
R. P. Singh A. N. Patwa S. M. Desai J. K. Pandey S. S. Solanky A. Vishwa Prasad 《应用聚合物科学杂志》2003,90(4):1126-1138
Polymeric hindered amine light stabilizers (HALSs), in which the HALS functionality was attached to the terminal isocyanate chain end of poly(styryl‐co‐styryl isocyanate), were synthesized by a two‐step process. First, cinnamoyl azide was prepared and copolymerized with styrene by a free‐radical copolymerization method. Polymeric low‐molecular‐weight and high‐molecular‐weight 2,2,6,6‐tetramethyl‐4‐pipridinol‐graft‐poly(styryl‐co‐styryl isocyanate) and 4‐amino‐2,2,6,6‐tetramethyl piperidine‐graft‐poly(styryl‐co‐styryl isocyanate) were synthesized by a grafting method. The photodegradation and stabilization of different grades of high‐impact polystyrene (HIPS) were studied at 55°C in air at different time intervals, and the photostabilizing efficiency of polymeric HALSs was compared with conventional light stabilizers, such as 2,2,6,6‐tetramethyl‐4‐pipridinol and bis(2,2,6,6‐tetramethyl‐4‐piperidinyl)sebacate. Polymeric HALSs showed significant improvements in the photostabilization of HIPS. The solubility and diffusion coefficient of polymeric HALSs were studied. The morphological changes in HIPS caused by photooxidation were also studied. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1126–1138, 2003 相似文献
13.
国产光稳定剂BW—10LD在聚丙烯生产中的应用研究 总被引:2,自引:2,他引:0
对国产受阻胺类光稳定剂BW-10LD与同类进口产品Tinuvin 622LD的理化性能进行了对比分析,研究了BW-10LD对聚丙烯老化性能的影响及其在PP生产中的应用,并对受阻胺类光稳定剂的作用机理进行了探讨。 相似文献
14.
Christopher M. Liauw Angela Quadir Norman S. Allen Michele Edge Alan Wagner 《乙烯基与添加剂工艺杂志》2004,10(2):79-87
This series of papers explores the effect of structural characteristics of 2,2,6,6‐tetramethylpiperidine‐based hindered amine light stabilizers (HALS) on the long‐term (40 months) thermal (110°C in air) and photo‐stabilization (Microscal unit wavelength >300 nm) performance characteristics of high‐density polyethylene formulations. Possible synergism with a triazine functional UV absorber is also explored. Under thermal degradation (measured by carbonyl index) the polymeric HALS performed best, mainly because of reduced volatilization. Additionally, >N‐methyl HALS generally showed superior performance under thermal degradation. There was no synergism between an N‐CH3 polymeric HALS and the UV1164 triazine additive. However, the equivalent N‐H polymeric HALS interacted in a complex manner with UV1164, giving synergism and antagonism, depending on HALS/UV1164 ratio. Strong synergism was evident with the monomeric HALS when the total stabilizer level was 0.2% w/w. Reduction in the overall stabilizer level to 0.05% w/w eliminated the synergism. The UV1164 alone led to rapid and intense yellowing; however, the rate and intensity of yellowing reduced dramatically upon combination with HALS, particularly when the UV1164 level was above 0.1% w/w. When the formulation was under UV attack, the molar mass and the type of N‐substitution had no influence on stabilization performance because of the relatively low temperature of testing (leading to reduced volatilization), and the similarly effective UV‐stabilization routes for N‐methyl HALS and N‐H HALS. Under UV attack, yellowing reached a maximum and then decreased to approximately the initial level, while HALS/UV1164 combinations generally showed weak antagonism. J. Vinyl Addit. Technol. 10:79–87, 2004. © 2004 Society of Plastics Engineers. 相似文献
15.
Ultraviolet absorbers and hindered amine light stabilizers are two kinds of efficient photostabilizers, which have different mechanisms. It is possible to make a synergistic interaction if introducing these two types of photostabilizing fragments into one molecule. In this article, two novel multifunctional photostabilizers UVH‐1 and UVH‐2 containing UVA and HALS fragments were synthesized from a 2‐hydroxyphenylbenzotriazole compound (UV‐P). UVH‐1 was synthesized by a three‐step synthetic strategy via esterification, bromination, and amination. UVH‐2 was facilely synthesized by a one‐step three‐component Mannich reaction. The chemical structure of UVH‐1 and UVH‐2 were confirmed by Fourier‐transform infrared (FTIR), 1H NMR, 13C NMR, and mass spectrometry. Both multifunctional photostabilizers UVH‐1 and UVH‐2 show good ultraviolet absorption performance and excellent light stabilizing effect when applied to photoprotection of dye, polyacrylonitrile, and polyurethane in the solution state, in which UVH‐1 shows better light stabilization performance even on polymers. It can be concluded that a combination of the HALS and UVA active groups can enhance the photoprotective effect on dyes and polymers and also increase the molecular weight of the additive to overcome escape of the photostabilizer from the polymer matrix. J. VINYL ADDIT. TECHNOL., 26:259–267, 2020. © 2019 Society of Plastics Engineers 相似文献
16.
In this study, polymeric hindered amine light stabilizers (HALS)-functionalized silica coated rutile titanium dioxide (TiO2-SiO2) nanoparticles were prepared by encapsulating commercially available TiO2-SiO2 nanoparticles with methyl methacrylate (MMA) and 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate (PMPM) copolymers via miniemulsion polymerization. The obtained functional (TiO2-SiO2/P(MMA-co-PMPM)) fillers have been added to polyurethane acrylate (PUA) oligomers to get UV-curable nanocomposite coatings. The functionalization of the TiO2-SiO2 nanoparticles with polymeric HALS has been confirmed by infrared spectra (IR), thermogravimetric (TG), and X-ray photoelectron spectroscopy (XPS) analyses. The scanning electron microscope (SEM) micrographs indicated that homogeneous dispersion of TiO2-SiO2/P(MMA-co-PMPM) composite nanoparticles resulted in improved transparency and mechanical properties of the UV-curable PUA coatings. Rhodamine B (Rh.B) photodegradation measurement confirmed the excellent UV-shielding performance of PUA nanocomposite coatings containing TiO2-SiO2/P(MMA-co-PMPM). The addition of TiO2-SiO2/P(MMA-co-PMPM) composite nanoparticles reduced the UV-curable PUA coatings degradation rate dramatically. The UV-aging resistance of PUA coatings was improved significantly. Over all, the combination of TiO2-SiO2 nanoparticles and polymeric HALS offers an attractive way to fabricate the multi-functional fillers, which can be used to improve the mechanical properties and UV-aging resistance of PUA coatings simultaneously. 相似文献
17.
为了提高B72文物保护材料的耐光性能,采用HALS-622等6种受阻胺光稳定剂对丙烯酸类文物保护材料B72进行改性。结果表明,HALS-5060稳定剂在添加后及老化过程中颜色明显变黄,不宜用作B72改性材料。高相对分子质量(简称分子量,以下同)受阻胺HALS-622、HALS-944比低分子量受阻胺HALS-480、HALS-508和HALS-292稳定效果好,尤其是低碱性的HALS-622受阻胺。因此,采用高分子量、低碱性的受阻胺改性B72是延长其使用寿命、对文物进行有效保护的新途径。 相似文献
18.
A new diol‐functionalized triazine‐based polymerizable hindered amine light stabilizer (HALS) was synthesized in two steps. First, selective synthesis of an s‐triazine containing two HALS moieties as substituents was accomplished by using phase‐transfer catalysis. This step required the establishment of optimum reaction conditions (type of two‐phase system, best solvent, and catalyst). In the second step, the substituted triazine was treated with diethanolamine to introduce polymerizable diol functionality. The resulting product should act as a light stabilizer, since it contains two HALS moieties anchored to a thermally stable s‐triazine unit. Moreover, incorporation of the diol into a polymeric material might be expected to impart prolonged stability in weathering environments. Characterization of the diol was accomplished by using Fourier transform infrared spectroscopy (FTIR), 'H NMR, and mass spectrometry. J. VINYL ADDIT. TECHNOL., 18:204–208, 2012. © 2012 Society of Plastics Engineers 相似文献
19.