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。     

国内塑料抗氧剂、光稳定剂市场现状与技术发展

介绍了国内塑料抗氧剂、光稳定剂市场的主要利好因素和问题,预测了2009～2011年塑料抗氧荆、光稳定剂市场,并提出了国内塑料抗氧剂、光稳定剂企业的发展方向和趋势。     

抗氧剂、光稳定剂的基本功能、评价方法及选用原则

论述了塑料抗氧剂、光稳定剂的防老化基本功能及评价方法，特别介绍了受阻胺类光稳定剂的抗热氧老化功能，提出了设计配方时选用抗氧剂、光稳定剂的参考原则。     

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。     

稳定剂提高聚氨酯材料抗紫外光老化性能的研究进展

介绍了聚氨酯材料光老化的机理,并对紫外线吸收剂(UV-P,UV-328,UV-B-97、UV-B-75等)、光稳定剂、HALS(受阻胺光稳定剂)和抗氧剂(BHT,抗氧剂Chinox 30 N,1135,抗氧剂PUR67,抗氧剂PUR68等)提高聚氨酯的抗光老化性能研究进行了综述,可以看出,组合使用某些稳定剂可得到最好的效果。     

光氧稳定剂对塑木复合材料性能的影响

以紫外光稳定剂531和抗氧剂2246为光氧稳定剂,研究了塑木复合材料受光氧影响时的弯曲性能、色泽变化、氧化诱导期和外观变化.研究表明,经紫外光照射后,光氧稳定剂对材料的弯曲性能影响不大,但添加有光氧稳定剂的材料的表面色泽变化小,发白不明显.在紫外光稳定剂531和抗氧剂2246的添加量分别为0.3%时,材料经300h紫外...     

聚烯烃用抗氧剂及光稳定剂的研究进展

综述了国际大型公司和国内研究机构新近出品的抗氧剂、光稳定剂。对效率高的酚类抗氧剂进行了重点介绍。受阻胺类光稳定仍是光稳定剂的主流,已开发出适用于食品包装材料及环保型的光稳定剂。各种研究机构正在不断研究新型结构的稳定剂,通过高相对分子质量化、复配等技术,制备出高效、环保、多功能化的稳定剂。     

抗氧剂和光稳定剂对线形低密度聚乙烯氙灯老化的稳定作用

采用氙灯老化的方法研究了抗氧剂1010,168与光稳定剂622对线形低密度聚乙烯(PE-LLD)的影响，并通过拉伸性能测试和凝胶渗透色谱分析对老化前后PE-LLD的性能和结构进行了研究。结果表明，未添加抗氧剂、光稳定剂的PE-LLD经氙灯老化3d后断裂伸长保留率小于50%，单独添加0. 15份抗氧剂1010,168或光稳定剂622 , PE-LLD断裂伸长保留率小于50%时，需氙灯老化的天数分别为7,6和15 d。抗氧剂1010,168与光稳定剂622复配使用时，对PE-LLD的杭老化性有明显的协同效应。     

加氢润滑油基础油光稳定剂的研制

应用正交试验设计的方法,研究了自制的紫外辐射吸收剂、受阻胺类光稳定剂及抗氧剂对兰州石化总厂生产的125N加氢润滑油基础油抗光氧化降解性能的影响.发现以上各种添加剂均能提高加氢润滑油基础油抗光氧化降解的能力.在相同的辐射剂量下,添加四甲基受阻胺类光稳定剂的加氢基础油抗光氧化降解的能力优于添加五甲基受阻胺类光稳定剂;添加苯并三唑型紫外辐射吸收剂比添加二苯甲酮型紫外吸收剂的加氢基础油抗光氧化降解的能力强;紫外辐射吸收剂与受阻胺类光稳定剂之间以及紫外辐射吸收剂与抗氧剂之间均存在协同作用.并且发现,四甲基受阻胺类光稳定剂与酚类抗氧剂之间存在协同作用,而五甲基受阻胺类光稳定剂与酚类抗氧剂之间存在反协同作用.评价结果表明:添加自制的高效无灰复合型光稳定剂1.5g·L-1可使兰州炼油化工总厂生产的125N加氢润滑油基础油保持良好的光稳定性,其透光率、色度均优于添加2 g·L-1目前最好的有机镍盐配合物型光稳定剂.     

不饱和聚酯树脂的稳定化技术进展

综述了不饱和聚酯树脂(UP)的稳定化机理。由于UP光稳定性的制约,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。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,副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。     

聚酯PET稳定剂应用现状

综述了聚酯PET热降解和热氧降解机理,回顾了聚酯PET热稳定剂和抗氧剂作用机理,介绍了用于PET领域的热稳定剂和抗氧剂,并指出了稳定剂发展前景。     

Stabilization of ABS with bound synergistic stabilizers added as masterbatches

ABS masterbatch concentrates in antioxidants and UV stabilizers were added as conventional additives for normal ABS. The thermal and photo-oxidative performance of these polymers were compared with that of the commercial ABS and additives by measurement of carbonyl index and embrittlement times. From the result obtained, it is concluded that the addition of these additives in the form of masterbatches appears to be a better practical way of incorporating antioxidants and UV stabilizers into ABS simply by dilution of ABS, as these give thermal and light-stabilizing effects that cannot be achieved by stabilizers added in a conventional way. The bound stabilizers are resistant to leaching and chemical extraction.     

橡胶和塑料助剂的现状与展望

综述了橡胶和塑料助剂的国内外现状与发展趋势。为了符合环保法规,优化产品的成本/效能比,满足用户需求,今后技术改造和新产品开发将会持续活跃。     

聚合物稳定化助剂技术进展

回顾了最近10a国内外聚合物降解与稳定化理论的研究进展,指出稳定化助剂的技术发展趋势,介绍了热稳定剂、抗氧剂和光稳定剂品种的开发动向。     

抗氧剂、光稳定剂在聚碳酸酯和改性材料中的应用技术

简单介绍了抗氧剂和光稳定剂作用、功能和类别.列举了不同抗氧剂、光稳定剂条件下聚碳酸酯和ABS改性合金材料热老化试验的数据:亚磷酸酯抗氧剂和受阻酚抗氧剂的配合体系,可以有效保护聚碳酸酯的相对黏度和色泽,提高PC/ABS合金拉伸强度和缺口冲击强度;使用紫外线吸收剂可以有效地延缓聚碳酸酯变黄并适当保持强度;经试验或实际应用确...     

LLDPE用亚磷酸酯稳定剂国产化研究

在考查国产亚磷酸酯以及引进亚磷酸酯稳定剂在线性低密度聚乙烯(LLDPE)中的热加工性能的同时,通过亚磷酸酯与抗氧剂、多种助剂等复合使用以及其耐水解性能的研究,为亚磷酸酯稳定剂国产化提供了依据。     

New developments in speciality polymers: polymeric stabilizers

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 γ_max between 330 and 350 nm and extinction coefficients in some cases as high as 4.5 × 10⁴ 1 mol^?1 cm^?1.     

Netzwerkgebundene oxidationsinhibitoren in vernetztem polyäthylen

New antioxidants of improved properties in crosslinked polyethylene are presented. Their molecular structure includes an oxidation inhibiting part and a crosslink-reinforcing part. As a consequence of this structure the stabilizers are chemically bound to the polyethylene matrix during crosslinking. Therefore the stabilizers possess migration stability, are nonvolatile, and show a significantly improved stabilizing effect which is demonstrated by reference to measurements of their oxygen uptake at increased temperatures in comparison with that of the analogous components without a crosslink-reinforcing part.