共查询到19条相似文献,搜索用时 125 毫秒
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抗氧剂YHK-1由酚类抗氧剂、亚磷酸酯类抗氧剂及特殊添加剂组成。将自制抗氧剂YHK-1与进口同类产品进行比较,发现YHK-1抗氧剂能够更有效地抑制聚合物氧化,完全可替代进口产品而应用于ABS树脂中。 相似文献
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研究了影响透明ABS树脂性能的主要因素。结果表明,共聚掺混法可以制备冲击性能和透光率均较好的透明ABS树脂;MABS接枝粉的胶含量为50%时,所制备的透明ABS树脂性能较好:透明树脂的掺混配方中分散相的配比以50份为佳;透明ABS树脂抗氧剂选择很重要,采用聚合酚类抗氧剂效果较好。 相似文献
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通过测定ABS树脂的氧化诱导时间和氧化诱导温度及其在多次挤出前后熔融指数、黄色指数及微观结构的变化,研究了不同加工抗氧剂168、618、1076/168、1076/618对ABS树脂加工稳定性的影响。结果表明:四种抗氧体系均能使ABS树脂在多次挤出加工中保持良好的熔体稳定性,当抗氧剂168和618单独使用时,加入抗氧剂168和618的ABS树脂的热稳定性相当,但抗氧剂168能够更有效地抑制ABS树脂在加工过程中的黄变。当引入受阻酚类主抗氧剂1076后,其与亚磷酸酯类抗氧剂并用时的效果好于亚磷酸酯类抗氧剂单独使用时的效果。与其他抗氧剂相比,复合抗氧剂1076/168能够更好地保持ABS树脂在多次挤出加工中的各项性能。 相似文献
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通过测定ABS树脂的氧化诱导时间和氧化诱导温度及其在多次挤出前后熔融指数、黄色指数及微观结构的变化,研究了不同加工抗氧剂168、618、1076/168、1076/618对ABS树脂加工稳定性的影响.结果表明:四种抗氧体系均能使ABS树脂在多次挤出加工中保持良好的熔体稳定性,当抗氧剂168和618单独使用时,加入抗氧剂168和618的ABS树脂的热稳定性相当,但抗氧剂168能够更有效地抑制ABS树脂在加工过程中的黄变.当引入受阻酚类主抗氧剂1076后,其与亚磷酸酯类抗氧剂并用时的效果好于亚磷酸酯类抗氧剂单独使用时的效果.与其他抗氧剂相比,复合抗氧剂1076/168能够更好地保持ABS树脂在多次挤出加工中的各项性能. 相似文献
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牛秋生;刘振国;徐刚;张会轩;杨海东 《中国塑料》2011,25(5):55-59
采用湿法挤出工艺,即将乳液聚合合成的经凝聚和过滤的丙烯腈-丁二烯-苯乙烯(ABS)湿粉料与苯乙烯-丙烯腈共聚物(SAN)树脂以一定的比例投入湿法挤出机内挤出造粒,直接获得了ABS树脂。考察了ABS粉料含水量、ABS树脂中橡胶含量、抗氧剂含量、挤出机温度及螺杆转速等因素对ABS树脂力学性能的影响。结果表明,挤出温度过高明显引起物料降解,ABS树脂的冲击强度减小,拉伸强度降低;ABS粉料含水量对ABS树脂的性能没有明显影响;透射电子显微镜分析表明,橡胶粒子在SAN基体中分散均匀;湿法挤出的最佳工艺参数为,挤出温度:180 ℃,螺杆转速:200 r/min,抗氧剂含量:0.154 %(质量分数,下同)。 相似文献
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采用湿法挤出工艺,即将乳液聚合合成的丙烯腈-丁二烯-苯乙烯(ABS)接枝共聚物经凝聚和过滤后得到的ABS接枝共聚物湿粉料与苯乙烯-丙烯腈共聚物(SAN)以一定的比例投入湿法挤出机内挤出造粒,直接获得了ABS树脂。考察了ABS接枝共聚物湿粉料含水量、ABS树脂中橡胶含量、抗氧剂含量、挤出机温度及螺杆转速等因素对ABS树脂力学性能的影响。结果表明,挤出温度过高明显引起物料降解,ABS树脂的冲击强度减小,拉伸强度降低;ABS接枝共聚物湿粉料含水量对ABS树脂的性能没有明显影响;透射电子显微镜分析表明,橡胶粒子在SAN基体中分散均匀;湿法挤出的最佳工艺参数为,挤出温度:180℃,螺杆转速:200 r/min,抗氧剂含量:0.154%(质量分数,下同)。 相似文献
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丙烯腈-丁二烯-苯乙烯三元共聚物(ABS树脂)在注塑加工过程中,树脂在料筒中容易滞留老化,使制品外观颜色变差,因此高温环境下的色度变化日益成为衡量ABS树脂耐热氧老化能力的一个关键指标。而抗氧剂往往能够在聚合物加工过程中提高ABS树脂的耐热稳定性。通过熔融共混的方式,在ABS树脂中添加了618、3052、1076和3114等不同种类的抗氧剂,利用高温色差△E、氧化诱导温度、热失重等一些性能测试方法,研究抗氧剂类型对ABS树脂的热氧老化及最终性能的影响。结果表明,在250~350℃的温度范围下,抗氧剂3052由于结构上特有的丙烯酸酯基团和分子内氢键作用,可以使ABS树脂在长期热氧老化的过程中体现出更为优越的热氧稳定性能和耐黄变性能,在180~210℃的高温环境下,抗氧剂618由于特有的亚磷酸酯结构可以有效降低ABS树脂的黄色指数,并维持较好的力学性能。 相似文献
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Rumyana Simeonova Mariyana Atanasova Georgi Stavrakov Irena Philipova Irini Doytchinova 《International journal of molecular sciences》2022,23(23)
Oxidative stress is an essential factor in the development and progression of Alzheimer’s disease (AD). An excessive amount of reactive oxygen species (ROS) induces the peroxidation of lipid membranes, reduces the activity of antioxidant enzymes and causes neurotoxicity. In this study, we investigated the antioxidant and cholinesterase inhibitory potential of a novel galantamine–curcumin hybrid, named 4b, administered orally in two doses (2.5 mg/kg and 5 mg/kg) in scopolamine (SC)-induced neurotoxicity in mice. To evaluate the effects of 4b, we used galantamine (GAL) (3 mg/kg) and curcumin (CCN) (25 mg/kg) as positive controls. Ex vivo experiments on mouse brains showed that the higher dose of 4b (5 mg/kg) increased reduced glutathione (GSH) levels by 46%, catalase (CAT) and superoxide dismutase (SOD) activity by 57%, and glutathione peroxidase (GPx) activity by 108%, compared with the SC-treated group. At the same time, 4b (5 mg/kg) significantly reduced the brain malondialdehyde (MDA) level by 31% and acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) activities by 40% and 30%, respectively, relative to the SC-impaired group. The results showed that 4b acted as an antioxidant agent and brain protector, making it promising for further experimental research in the field of neurodegenerative diseases. 相似文献
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<正>天然橡胶(NR)和丁苯橡胶(SBR)常用作轮胎胎面胶的主体材料,而轮胎胎侧胶是贴覆于外胎侧壁表面的覆盖胶层,起着保护帘布层免受潮湿、大气作用及机械损伤等,一般要求胎侧胶料具有耐曲挠疲劳、耐臭氧老化等性能。 相似文献
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Thermo-oxidative ageing processes were investigated in films (100 μm thick) made from isotactic polypropylene with different antioxidant concentrations between 0% and 0.1% using isothermal long-term differential thermal analysis (ILDTA). The end of the oven life of polypropylene coincided with the loss of mechanical properties which was confirmed by tensile tests at temperatures far below the crystallite melting range. Already prior to the beginning of autocatalytic decomposition, ILDTA experiments permits conclusions to be drawn on the thermal history of the specimens and statements made regarding the end of thermo-oxidative stability of the polymer, which is accompanied by a deterioration in the mechanical properties. In consequence of the correlation between oxidation time and antioxidant concentration the local antioxidant concentration in sheets or films can be measured by ILDTA. Thus, investigating the diffusion of an antioxidant in polypropylene using ILDTA is possible. 相似文献
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Ming-Kuei Shih You-Lin Tain Chiu-Min Cheng Chien-Ning Hsu Yu-Wei Chen Hung-Tse Huang Chi-I Chang Chih-Yao Hou 《International journal of molecular sciences》2021,22(24)
Resveratrol butyrate ester (RBE) complexes have demonstrated higher antioxidant capacity and anti-fat accumulation activity in previous studies. In this study, silica gel, high-performance liquid chromatography, and 1H nuclear magnetic resonance were used for separation and identification of RBE complex components. With the exception of resveratrol, five different structures of ester derivatives were separated from silica gel: 3,4′-di-O-butanoylresveratrol (ED2, 18.8%), 3-O-butanoylresveratrol (ED4, 35.7%), 4′-O-butanoylresveratrol (ED5, 4.4%), 3,5,4′-tri-O-butanoylresveratrol (ED6, 1.5%), and 3,5-di-O-butanoylresveratrol (ED7, 0.7%). Among the ester derivatives obtained, ED2 and ED4 were the main ester derivatives in the RBE complex. Thus, the cellular antioxidant activities of the RBE mixture, ED2, and ED4 were evaluated. Results showed that the antioxidant capacity of ED2 and ED4 was higher than that of the RBE mixture, demonstrating that the number and position of butyrate esterification sites are related to cell survival rate and antioxidant capacity. This study is the first to report the successful isolation, structural identification, and cellular biological antioxidant activity of RBE complex derivatives, which are key characteristics for the potential practical application of RBE complexes. 相似文献
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在有机锡催化下,以3–(3,5–二叔丁基–4–羟基苯基)丙酸甲酯和异辛醇为原料合成了液体酚抗氧剂,在优选的反应条件下,抗氧剂的收率95%,质量分数99%。经分析和应用验证,所合成的抗氧剂可明显抑制或延缓燃料油的氧化老化。 相似文献