再生润滑油光稳定性技术研究

针对再生润滑油基础油在光照下容易发生变色、浑浊甚至出现沉淀技术问题,通过研究不同受阻胺型光稳剂、紫外线吸收剂以及抗氧剂对润滑油光照下光稳定性能,实验提出复合光稳剂添加浓度为:光稳剂770为120mg/L,紫外吸收剂UV-326为150mg/L,抗氧剂264为90mg/L。     

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。     

耐电子束辐照高分子材料改性研究进展

概述了电子束辐照应用发展和高分子材料的耐辐照改性;重点叙述了本体耐辐照高分子材料及其使用的局限性,综述了具有大电子云结构的引入、受阻酚类抗氧剂、受阻胺类光稳定剂对高分子材料辐照性能影响的研究,以及其他改性填加剂的作用机理与效果。添加受阻酚类抗氧剂、受阻胺类光稳定剂等对高分子材料耐电子束辐照有一定效果,稳定剂复配具有更加良好的耐辐照效应;开发高效的稳定剂以制备耐辐照高分子材料仍然是十分迫切的研究重点。     

光稳定剂在加氢润滑油基础油中的应用进展

对加氢润滑油基础油的光稳定性机理,典型的光稳定剂如紫外线吸收剂、激发态猝灭剂、氢过氧化物分解剂、自由基捕获剂的组成与作用机理进行了总结。对能够改善加氢润滑油基础油光稳定性的光稳剂进行了综述,提出了光稳定剂在加氢润滑油基础油中应用方面的研究建议。     

松原：立足增长,放眼未来

松原产业株式会社是全球最大的抗氧化剂供应商之一,目前松原集团抗氧剂的全球总产量已达到80kt,另外在受阻胺类光稳定剂、紫外线吸收剂、热稳定剂和增塑剂、润滑剂、表面涂层助剂、聚氨酯、烷基酚类、双苯酚、絮凝剂等众多领域内均有突出表现。     

苯乙烯—4—(甲基丙烯酸)2,2,6,6—四甲基哌啶醇酯共聚物(PDS)与几种抗氧剂并用效应的研究

本文研究了PDS和三种常用的抗氧剂在聚丙烯中并用时的效应。结果表明,对于聚丙烯的热氧化和光氧化,PDS和这三种抗氧剂之间都表现出反协同效应,而且热氧化过程中反协同效应更为强烈。对PDS和受阻酚抗氧剂之间反协同效应的可能机理进行了探讨。苯乙烯—4—(甲基丙烯酸)2,2,6,6—四甲基哌啶醇酯共聚物(简称PDS)是一种高分子受阻胺稳定剂。它具有很高的光稳定效能,但对热氧化的稳定作用较差,在高分子材料热加工时还必须添加一定的抗氧剂,因此研究它和抗氧剂的并用效应有重要意义。N.S.Allen曾研究过多种抗氧剂和受阻胺光稳定剂Tinuvin770,即双(2,2,6,6—四甲基哌啶)癸二酸酯在聚丙烯中并用时的效应,发现有反协同作用。老化研究所在进行的有关大气曝露实验中,也曾注意到PDS和某些抗氧剂之间具有反协同作用的现象。Allen还研究了受阻胺和酚类抗氧剂产生反协同作用的原因,认为热加工过程中,在受阻胺产生的氮氧自由基的催化作用下,受阻酚变成了醌式结构,后者具有光敏化作用,从而促进了高分子材料的光降解作用。在本文中,我们研究了PDS和三种常见的抗氧剂在聚丙烯中的并用效应,并对PDS和酚类抗氧剂的相互作用问题进行了探讨。     

各类稳定剂对聚乙烯薄膜光氧老化的稳定作用

研究了不同光稳定剂和抗氧剂及其配合使用、光稳定剂含量对聚乙烯薄膜耐光氧老化性的影响。结果表明：在各类光稳定剂中、受阻胺类稳定剂的效果最好;紫外线吸收剂与受阻胺配合使用可使膜的耐老化性有所提高;各类抗氧剂对聚乙烯膜的耐光氧老化性没有不利影响;光稳定剂含量增加,薄膜耐老化寿命提高。     

受阻胺类光稳定剂对聚氯乙烯的稳定作用

介绍了受阻胺类光稳定剂的结构与特征,同时综述了受阻胺类光稳定剂对不同PVC材料在受到外界环境条件如热和光照作用下的稳定作用。受阻胺类光稳定剂常与其他类型的助剂并用,与紫外线吸收剂或抗氧剂的并用后,会产生协同效应,主要是加和效应但也有对抗效应,这与选择的PVC原料种类和稳定体系都有关系。     

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。     

不饱和聚酯树脂的降解与稳定化研究进展

综述了不饱和聚酯树脂（UP）的降解机理，UP光稳定性较差，限制了其应用范围，添加适宜的稳定剂可明显改进其光稳定性，从而可用于户外。本文介绍了一些抗氧剂、紫外线吸收剂、受阻胺光稳定剂（HALS）。试验表明，只使用单一的稳定剂效果不佳，必须将主抗氧剂，辅抗氧剂和其他添加剂（例如：某些环氧化合物）并用，才能取得较好的稳定效果。     

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.     

新型光稳定剂产品应用于水性醇酸涂料的研究

醇酸树脂普遍应用于工业涂料,其暴露在自然太阳光时,容易造成外观上颜色的变化和涂层劣化与粉化,目前这层保护主要是添加紫外线吸收剂(UVA)和酸性系统使用受阻胺光稳定剂(N-OR HALS)来达成。由于环保趋势,水性醇酸涂料已发展成为解决有关一般常用传统高VOC溶剂型涂料,它能够有效减少或不使用溶剂的优点,而环保型涂料所遭遇的挑战之一,是需要光安定剂来保护涂料预防光劣化产生。先针对2种不同类型水性受阻胺光稳定剂N-R HALS(高碱性)和N-OR HALS(弱碱性)混合水性醇酸涂料测试,试验结果显示:N-OR HALS适用于水性醇酸涂料系统。本文主要是有关于应用试验设计(DOE)试验手法,根据实验室人工加速老化试验结果显示,增加水性紫外线吸收剂Eversorb AQ6和水性受阻胺光稳定剂(NOR-HALS)Eversorb AQ5在水性涂料中的有效浓度,可以增强相对的保护效果,试验数据显示膜厚对减缓黄变影响而言也是显著因子,但效果不如添加水性光稳定剂产品有效。     

Photooxidative stability provided by condensed tannin additives in acrylic-based surface coatings on exterior exposure

Condensed tannins, also known as proanthocyanidins, have been added as functional additives to acrylic-based clear coatings to promote polymer coating longevity and also stabilize timber color on accelerated and exterior weathering. When added at <?0.5% w/w content, native tannins and tannins modified with maleate groups extended coating performance >?20% compared to commercial hindered amine light stabilizers (HALS) and phenolic stabilizers used at comparable coating loadings. Other tannin chemical modifications such as methylcarboxylate groups were also associated with greater coating longevity beyond that achieved with the synthetic UV and antioxidant additives. This study has also revealed that tannin addition to acrylic coatings can act to photostabilize timber coloring on exterior exposure. While tannin use can contribute color to coatings, any color was rapidly bleached on UV exposure with a dependency on tannin content, degree of modification, and coating formulation pH. Moreover, through manipulating tannin addition levels, this tannin decolorization could offset typical wood darkening associated with UV exposure to provide low or no wood color change over longer exposure periods. With the photooxidative stability efficacy of tannins established on exterior exposure, condensed tannins in native and modified form offer potential as sustainable functional additives for the coatings sector.     

新型光稳定剂应用于水性环氧涂料的研究

水性环氧涂料已发展成为解决一般常用传统高VOC溶剂型涂料的高污染问题,它具有有效减少或不使用溶剂的优点,而环保型涂料所遭遇的挑战之一是需要光稳定剂来保护涂料预防光降解产生。针对水性环氧涂料开发了一种新型复配型光稳定剂EVERSORB EP5,应用实验设计(DOE)研究结果表明:3种不同类型光稳定剂添加至2种不同类型溶液-水和水性环氧涂料中进行分散过滤试验,EVERSORB EP5分散效果最好,人工加速老化试验结果显示:增加EVERSORB EP5在水性涂料中的有效浓度,可以增强相对的保护效果,增加涂料的膜厚无法得到某种程度的保护效果。     

以不饱和聚酯树脂为基的玻璃钢复合材料防老化研究进展

综述了不饱和聚酯树脂基玻璃钢复合材料(GFRP)防老化方面的最近研究进展,包括GFRP表面新型涂层及树脂的添加剂(紫外线吸收剂、受阻胺光稳定剂和抗氧剂等).结果表明,只使用单一的稳定剂效果不佳,必须将抗氧剂和其他添加剂(例如某些环氧化合物)并用,才能取得较好的效果.     

Synergistic efficiency of combined HALS–UV absorber polymerizable stabilizers

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     

Studies on the interaction of photoreactive light stabilizers and UV-absorbers

Coatings, like all organic substances, are submitted to photoageing during their life time. Ultraviolet light absorbing additives (UVAs) and hindered amine light stabilizers (HALS) often are added to improve their performance. These additives can be lost by migration to the surface, where they are exposed to physical depletion, as well as through photodegradation of the molecule itself. Modifying hindered amine light stabilizers by introducing a photoreactive site gives the possibility to fix the stabilizing molecule onto the polymer matrix. The influence of the presence and the type of UV absorbers onto the photografting reaction will be discussed.     

聚甲醛的光稳定化研究

采用了二苯甲酮类和苯并三唑类紫外线吸收剂(UVA)、位阻胺类光稳定剂(HALS)以及光屏蔽剂对聚甲醛进行光稳定化改性,对比了改性前后聚甲醛光降解后的物理力学性能及表面层分子量保持率。结果表明,0 5%的UVA可以显著提高POM的耐紫外光性能,苯并三唑类效果优于二苯甲酮类UVA。在酚类抗氧剂存在下,低含量的HALS(<0 25%)对聚甲醛没有光稳定化作用。     

聚甲醛、PET及PVC的抗老化配方研究进展

综述了聚甲醛(POM)、PET、PVC及其改性材料的抗老化研究的新进展。POM、PET及PVC/ABS的抗老化配方采用抗氧剂/紫外线吸收剂复配体系,而PVC及其他改性材料则采用紫外线吸收剂体系,若再加入适量的受阻胺光稳定剂,可以改善材料的抗老化效果。     

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.