聚氨酯材料的老化降解与稳定化研究进展

介绍了聚氨酯的降解与稳定化机理，综述了用于聚氨酯的紫外线吸收剂、抗氧剂、光稳定剂的一些品种。讨论了紫外线吸收剂(UV-571，UV-328)、抗氧剂(Irganox 1010、Irganox1135、Irganox3125)，受阻胺(HALS)(UV-770，UV-765)等稳定剂对聚氨酯材料的光氧、热老化的影响，结果表明，同时使用上述3类稳定剂可得到较好的效果     

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。     

提高聚氨酯耐紫外老化性的研究进展

介绍了聚氨酯材料的光老化机理,综述了采用紫外线吸收剂(UV-P,UV-328,UV-B83等)和抗氧剂(BHT,抗氧剂1135,抗氧剂PUR 67,抗氧剂PUR68等)提高聚氨酯耐紫外光老化性的研究进展。研究表明,将几种稳定剂组合使用可使聚氨酯获得最佳的稳定效果。     

提高聚氨酯材料抗光老化研究进展

介绍了聚氨酯材料紫外光老化机理,综述了采用紫外线吸收剂(UV-P,UV-328,UV-B-97、UV-B-75等)、光稳定剂HALS(自由基捕捉剂)和抗氧剂(BHT,Chinox 30N,1135,IRGASTSAB PUR 67,IRGASTSABPUR 68等)提高聚氨酯光老化性能的研究进展。研究表明,组合使用各种稳定剂往往能够获得最佳效果。     

光稳定剂对热塑性聚氨酯胶粘剂性能的影响

采用一步法合成耐黄变热塑性聚氨酯(TPU)胶粘剂,研究了紫外线吸收剂UV-329、受阻胺光稳定剂UV-622、抗氧剂Chinox1010等对TPU胶粘剂性能的影响。结果表明,当UV-329、UV-622、Chinox1010质量比为3∶3∶2,且复合光稳定剂添加质量分数1.6%时,可提高TPU胶粘剂的耐黄变性能,有效延缓TPU胶粘剂的光老化速度。     

供求信息

供单位:天津天大天海科技发展有限公司电话:022-274066832740736627409819联系人:李玉芙朱文伯紫外线吸收剂光稳定剂成核透明剂聚丙烯酰胺(阳)聚丙烯酰胺(阴、非)聚合氯化铝UV-326UV-3277706223940TH-3500￣1000万分子量1000￣1200万分子量国标本厂本厂本厂进口国产国产不限不限不限不限不限不限1200007800015万￣30万32000￣380001400001800￣190020kg/桶25kg/桶20kg/桶25kg/袋25kg/袋25kg/袋天津天津天津天津天津天津紫外线吸收剂紫外线吸收剂紫外线吸收剂紫外线吸收剂抗氧剂抗氧剂抗氧剂抗氧剂抗氧剂抗氧剂抗氧剂抗氧剂UV-328UV-329…     

提高聚氨酯材料耐老化性能的研究

分析了聚氨酯的降解与稳定化机理,考查了抗氧剂（Chinox245、Chinox1010、ChinoxB225）、紫外线吸收剂（UV-234、UV-328、SUV）等稳定剂对聚氨酯材料的光氧化、热老化的影响。实验结果表明,SUV与B225并用时,材料具有良好的光稳定性,机械性能保持率较高。     

助剂对透明聚氨酯弹性体耐黄变性能的影响

通过正交试验考察了在不同环境下不同的抗氧剂、紫外线吸收剂、助抗氧剂以及光稳定剂对透明聚氨酯弹性体耐黄变性能影响,优化了不同环境下的最佳助剂组成.结果表明:在室内避光条件下影响材料耐黄变性能的助剂主次顺序为助抗氧剂＞紫外线吸收剂＞光稳定剂＞抗氧剂;在室内日光灯照射条件下影响材料耐黄变性能的助剂主次顺序为紫外线吸收剂＞助抗...     

聚氨酯的降解与稳定化研究进展 (Ⅱ)聚氨酯的稳定化

介绍了用于聚氨酯的紫外线吸收剂、光稳定剂、抗氧剂的一些品种,论述了聚氨酯稳定化原理与技术及其在鞋底制造中的应用。     

山西省化工研究院推出光稳定剂系列

山西省化工研究院在相继推出TM、TMA、TMB、TMP系列成核剂,KY系列抗氧剂的基础上,又针对不同应用领域和应用特点,推出了光稳定剂系列。山西省化工研究院的光稳定剂系列现包括以下四个品种:UV-418、UV-419、GW-628、GW-4611。前两种均为高效紫外线吸收剂,且可与受     

不饱和聚酯树脂稳定化研究进展

介绍了不饱和聚酯树脂稳定化方面的新近研究进展,包括不饱和聚酯制品如玻璃钢表面新型涂层及新型稳定剂(紫外线吸收剂、受阻胺光稳定剂和抗氧剂)等。研究表明,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。     

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.     

Study on the High Efficiency Antioxidant of Polyoxymethylene

This article reports on the properties and uses of antioxidant F/B, a type of high efficiency antioxidant for polyoxymethylene (POM), consisting of the hindered phenolic main antioxidant, the secondary thermostabilizer phosphite ester, and lactone compound. Our experimental studies focused on the thermostabilization effect of antioxidant F/B on POM, which was measured by isothermal weight loss analysis at 220°C, isothermal weight loss rate analysis at 222°C, balance torque analysis, nonisothermal gravity analysis (TGA), oxidation induction time (OIT) analysis, and multiple processing and long-term aging analysis as compared to the commonly used antioxidant Irganox245 of POM. The results showed that the thermal stability of POM can be improved remarkably by using antioxidant F/B. The aging mechanism of POM under heat and oxygen was studied by the measurements of polarized light microscopy (PLM), differential scanning calorimetry (DSC), and X-ray photoelectron energy spectrum (XPS), which showed very slight changes of spherulites dimension, crystallinity, and the surface atom concentration after 15 days of aging at 140°C. Furthermore, the small amount of degradation of POM only occurred in the amorphous region of POM. These experiments demonstrated that lower amounts of antioxidant F/B can reach the same level of thermal stabilization of POM as is achieved with higher amounts of Irganox245, and can replace Irganox245 for use in the production of POM, which can further improve the thermal stabilization and reduce the production cost of POM.     

复配型受阻酚类抗氧剂对聚甲醛的稳定作用

将受阻酚类抗氧剂Irganox245和Irganox1010进行复配并加入聚甲醛中，通过将物料在设定温度下多次挤出，测定挤出物料的黄色指数、拉伸强度、冲击强度、熔体质量流动速率、热失重率等方法对单剂和复配抗氧剂在聚甲醛中的稳定作用进行了研究。结果表明：将抗氧剂Irganox245和Irganox1010复配后，提高了聚甲醛的分解温度，较好地保持了聚甲醛的各项性能，没有发生劣化现象，作用效果介于两种抗氧剂单独作用效果之间；在聚甲醛的热氧稳定性能方面起到一定的协同作用。     

Performance and synergistic effect of phenolic and thio antioxidants in ABS graft copolymers

The synergistic effect of phenolic and thio antioxidants on the stabilization of acrylonitrile-butadiene-styrene (ABS) graft copolymers has been studied. Three commercial antioxidants Irganox245, Irganox1076 and dilauryl thiodipropionate (DLTP) were selected. Formulations based on hindered phenols and secondary antioxidant DLTP were prepared. Stabilization was monitored in terms of changes in the functional groups (oxidation products), tensile properties and yellowness index. Differential scanning calorimetry (DSC) and thermogravimetry (TG) were also used to assess the stability. The results indicated that the combination of Irganox245 and DLTP showed much better stabilization effect than the individual components due to the strong synergistic effect. Only weak synergism could be observed in the formulation that contained Irganox1076 and DLTP. Irganox1076 and Irgnox1076/DLTP exhibited similar behaviors between antioxidants with the highest and lowest efficiencies.     

Stabilization of low‐density polyethylene films containing metal stearates as photodegradants

The effect of various stabilizer additives on Low‐Density Polyethylene films with a thickness of ca. 40 μm and containing metal stearates was studied. The films were subjected to accelerated aging in a QUV Weatherometer. The apparatus was fitted with A320 lamps and operated on a dry cycle at 63°C and an irradiance of 0.67 W/m². A phosphite (Naugard P) and a phosphate (Alkanox 240P) antioxidant provided good stabilization against UV degradation accelerated by transition metal photocatalysts such as cobalt stearate. These compounds outperformed HALS‐based UV stabilizers and a metal deactivator (Irganox MD 1024) at the concentrations tested. J. VINYL ADDIT. TECHNOL., 2011. © 2011 Society of Plastics Engineers     

塑料稳定剂在玻璃纤维增强不饱和聚酯树脂中的应用

综述了塑料稳定剂(包括紫外线吸收剂、受阻胺光稳定剂和抗氧剂等)在不饱和聚酯玻璃纤维增强塑料(GFRP)上的应用研究情况。一些研究结果表明:只使用单一的稳定剂效果不佳,必须配合使用稳定剂,才能取得较好的防老化效果。