多功能型聚合物稳定剂的研究进展

多功能化是聚合物添加剂发展的重要趋势之一,在同一分子中引入不同功能性的基团,是实现多功能化的主要途径。本文对该类稳定剂的合成和应用进行了综述,简要介绍了其中一些品种,如苯并三唑-受阻酚型、受阻胺-受阻酚型、受阻胺-二苯酮型、受阻胺-苯并三唑型、硫酯类-抗氧剂型、偶联剂-受阻酚-抗氧剂型等。     

国外有关塑料助剂研究的期刊文摘（光稳定剂）

氢键型紫外光吸收剂与受阻胺光稳定剂之间的协同效应；苯甲酸酯型紫外光吸收剂与受阻胺光稳定剂之间的相互作用；聚丙烯中N-烷氧基受阻胺光稳定剂对澳化阻燃剂分解的影响；含有单偶氮颜料的全同聚丙烯的光稳定性；用X-射线光电子能谱方法研究低密度聚乙烯工业品的自然老化；     

受阻胺/热塑性聚氨酯复合材料的结构与性能研究

对受阻胺/热塑性聚氨酯复合材料的结构和性能进行研究.结果表明,受阻胺GW-622均匀分散在受阻胺GW-622/TPU复合材料中,受阻胺GW-944在受阻胺GW-944/TPU复合材料存在少量团聚体;随着受阻胺用量的增大,受阻胺/TPU复合材料高温区的阻尼性能显著提高;与TPU相比,复合材料的拉伸强度大幅下降.     

高分子材料抗氧剂的抗氧机理及发展趋势

综述了受阻酚、受阻胺传统抗氧剂的种类和抗氧机理,重点介绍了非受阻酚类抗氧剂的分子结构特点和作用机理。并指出抗氧剂的发展趋势是向着多功能化、反应型、高分子量化和安全化方向发展。     

聚甲醛耐光稳定性研究进展

综述了聚甲醛光氧老化特性和光稳定剂研究开发现状,指出了聚甲醛光稳定剂未来发展趋势。聚甲醛对抗紫外光稳定性较差,容易发生降解与氧化,添加光稳定剂有助于提高聚甲醛耐光稳定性。常用的聚甲醛光稳定剂主要包括紫外光屏蔽剂、紫外光吸收剂和受阻胺类光稳定剂等三大类,对光稳定剂的研究方向主要包括高相对分子质量化、聚合物键合化、多功能化、受阻胺低碱性化等方面。     

受阻胺光稳定剂的研究进展

综述了国内外受阻胺光稳定荆（HALS）的研究现状与发展趋势,指出该领域正向高相对分子质量化、多功能化、低碱化、反应性方向发展。并提出了国内HALS产业发展的一些建议。     

受阻胺光稳定剂Tinuvin——622结构测定

(一)前言受阻胺光稳定剂的大分子化是近年来受阻胺光稳定剂发展的最重要方向,Tinuv in-622(简称622)是汽—嘉公司最近合成的新型大分子受阻胺光稳定剂,据称,它具有较好的防光性能,特别是由于大分子化,使它的耐抽提性,耐热性均优于770,并声称,由于622的出现,已使丙纶防老问题基本上得到解决。但对622的结构一直严加保密,1981年来     

某些高分子受阻胺对聚丙烯稳定化作用的研究

众所周知,受阻胺光稳定剂对聚烯烃有良好的光稳定效率,已引起世界的注意。然而,小分子量的受阻胺易于挥发,从而影响它的效率发挥,为了克服这个缺点,使小分子受阻胺的高分子化是近年来受阻胺光稳定剂发展的方向,本文主要是研究三种商品化高分子受阻胺光稳定剂对聚丙烯的稳定化作用及其效率和机理。     

国内受阻胺类光稳定剂合成研究新进展

受阻胺类光稳定剂(HALS)具有优异的抗老化性能,其合成研究一直是抗老化领域科研工作者的研究重点。本文从商品化产品的工艺优化、新型HALS的合成研究、含烷氧基团的受阻胺结构(NOR型)HALS的烷氧基化方法三个方面论述了近十年国内HALS合成的研究情况。     

受阻胺光稳定剂的多功能性及其结构优化

简述了在高分子材料中受阻胺光稳定剂（HALS）作用的机理以及其他功能,并介绍了目前从结构上对受阻胺光稳定剂进行的性能优化的4种主要途径：高相对分子质量化,引入其他功能基团,低碱性化和提高相容性。     

Effect of penta- and tetramethyl HALS on the radiation resistance of polypropylene

2,2,6,6-Tetramethyl-4-piperidinyl methacrylate (TMPM), a new pentamethyl HALS 1,2,2,6,6-pentamethyl-4-piperidinyl methacrylate (PMPM), their homopolymers (PTMPM and PPMPM), and their copolymers, [i.e., TMPM or PMPM copolymerized with monomers methyl methacrylate (MMA), methacrylic acid (MAA), acrylic acid (AA), and styrene (St) separately] were synthesized. PMPM shows an extremely excellent stabilizing effectiveness on improving the radiation resistance of polypropylene (PP) in comparison with other low molecular weight (LMW) HALS or polymeric HALS. Polymeric HALS shows a much higher thermal stability and better extraction resistance than that of LMW HALS. It is found that the Eb values of the PP-added pentamethyl HALS series are higher than those of PP with the corresponding tetramethyl HALS series at a given irradiation dose. A conclusion can be drawn that the pentamethyl HALS series has a higher stabilizing effectiveness than that of the tetramethyl HALS series. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 69: 2649–2656, 1998     

HALS及其在涂料中的应用

简介了位阻胺光稳定剂(HALS)的作用原理及涂料工业中常用HALS的结构及性能。     

Theoretical and experimental assessment of UV resistance of high-density polyethylene: Screening and optimization of hindered amine light stabilizers

Hindered amine light stabilizers (HALS) are widely used chemical stabilizers for preventing polymer degradation. In this study, the effects of type of HALS and its content in high-density polyethylene (HDPE) over the stabilization process are investigated employing density functional theory (DFT) and experimental approach. The electrophilicity index of four types of commercial HALS are compared by DFT to select the most effective one. Besides, the HDPE sample containing a phenolic antioxidant and different contents of the selected HALS are experimentally exposed to UV irradiation. The effect of HALS content on the changes in chain microstructure and molecular weight of HDPE are evaluated using gel permeation chromatography and frequency sweep rheometry. In the absence of HALS, HDPE suffers degradation and the phenolic antioxidant causes chain scission. However, by adding HALS, the chain branching and crosslinking mechanisms are predominant. The results of FTIR, DSC, and tensile analyses follow similar trends, revealing that the best stabilization performance corresponds to adding 600 ppm HALS to HDPE.     

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

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。     

受阻胺光稳定剂的生产与研究进展

介绍了国内外受阻胺光稳定剂（HALS）的生产状况,包括HALS的主要系列、品种、产量和需求情况。阐述了HALS的研究现状与发展趋势,指出该领域正向高相对分子质量化、多功能化、低碱化反应性方向发展,并提出了国内HALS产业发展的一些建议。     

耐药型受阻胺光稳定剂的发展

介绍了耐药型受阻胺光稳定剂（HALS）的发展。针对低pKa值HALS,含缚酸剂的HALS,以及N-烷基化和N-烷氧基化HALS,详细叙述了典型品种的性能特点,并报道了耐药型受阻胺光稳定剂的最新研究成果。     

Migration of hindered amine light stabilizers in automotive clearcoats

The diffusion behavior of two hindered amine light stabilizers (HALS) [bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)-sebacate and bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-sebacate] in an automotive clearcoat has been quantified via time-of-flight secondary ion mass spectrometry. Diffusion couples made from clearcoats with and without HALS allow for the estimation of the diffusion coefficient of one of the HALS. The high diffusion coefficient of one of the HALS contradicts the presence of HALS gradients in weathered coating systems. This discrepancy is ascribed to a decreasing diffusion coefficient of the HALS in the coating matrix due to a weathering-induced increase in the T _g of the clearcoat.     

Effect of hindered piperidine light stabilizer molecular structure and UV‐absorber addition on the oxidation of HDPE. Part 1: Long‐term thermal and photo‐oxidation studies

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.     

Hindered amine light stabilizers in pigmented coatings

It is common practice to combine hindered amine light stabilizers (HALS) with UV absorbers (UVA) for optimal protection of coatings and plastics. The ratio of UVA and HALS strongly depends on the concentration of pigments (acting as UVA) used in the paint; that is, a clearcoatings require higher amounts of UVA, whereas opaque pigmented coatings require higher amounts of HALS. Here, especially basic HALS types can interfere with paint components like, for example, pigments due to acid/base interactions. In this article, we want to discuss the influence of HALS basicity on long-term performance in opaque white pigmented solventborne (SB) and waterborne (WB) coatings for industrial applications in correlation to the quality of the used TiO₂.     

聚烯烃光稳定化技术进展

本文介绍了聚烯烃光稳定化的研究进展,并就受阻胺光稳定剂新的发展趋势及受阻胺光稳定剂与其它稳定剂之间的相互作用进行了较详细的讨论。