摘要尼龙 6 作为工程塑料在许多领域都有着广泛的应用，尼龙 6 薄膜凭借其优点在包装 领域也有着很多应用。由于尼龙材料在经过一段时间的使用后，会发生性能下降和黄变 的现象，因此需要对材料进行抗氧化研究。83375
本论文采用熔融共混的方法，以铜盐抗氧剂，1098/168 抗氧剂和 1098/626 抗氧剂 为热稳定剂，制备了耐热性尼龙 6 薄膜材料，研究了抗氧剂的种类、用量对尼龙 6 拉伸
强度、断裂伸长率、黄度指数的影响。并采用热重分析对尼龙 6 的耐热性能进行了表征。 结果显示，加入抗氧剂可以有效改善尼龙材料在热处理时的拉伸性能，不同类型的
抗氧剂对材料的黄变性能影响不尽相同。在老化过程中，含有抗氧剂的尼龙 6 拉伸强度 均维持在老化前的 80%以上。铜盐抗氧剂和 1098/168 抗氧剂容易使尼龙 6 变色，130
℃老化处理 240h 后黄色指数大于 60%。加入 1098/626 抗氧剂的尼龙 6 在热处理时具有 较好的抗黄变性能，130℃老化处理 240h 后黄色指数小于 25%。1098/626/铜盐三元抗 氧剂能有效提高尼龙 6 的热分解温度，由未加抗氧剂时的 400℃提高到 430℃，但材料 的黄变色现象较为明显，其黄色指数都大于 55%。
毕业论文关键词： 尼龙 6；抗氧剂；拉伸强度；黄色指数
Abstract Polyamide 6(PA 6) are widely used in many fields as the engineering materials, polyamide6 films with its advantage also have many applications in the field of packaging。 After a long time of usage, the nylon material will happen a decreasing of its property and yellowing。 It is necessary to study oxidation resistance of the materials。
In this paper, high temperature resistant Nylon 6 films were prepared via melt blend method, with copper salt antioxidant, antioxidant 1098/626, antioxidant 1098/168 as heat stabilizers。 The influences of kinds, dosage of antioxidants on tensile strength, elongation at break, and the yellowness index of Nylon 6 were studied。 The thermal performance of nylon 6 was characterized through TG analysis。
Results show that antioxidants can improve the tensile properties of PA 6 during thermal aging。 PA 6 with different antioxidants shows different yellowing properties。 After adding antioxidants, the tensile strength of PA6 is more than 80% of un-aging。 PA 6 is easy colored when the copper antioxidants and 1098/168 antioxidant were added, and its yellow index is more than 60%。 PA 6 with 1098/626 antioxidants has good anti-yellowing properties, its
yellow index are less than 25% after thermal aged 240h under 130℃。 From the results of TG
analysis, adding the 1098/626/copper salt ternary antioxidants, thermal decomposition temperature of PA 6 was increased from 400 ℃ to 430 ℃ than un-antioxidants。 PA 6 with 1098/626/copper salt ternary antioxidants is very easy to yellowing, their yellow index are
more than 55%。
Keywords: Polyamide 6; Antioxidants; Tensile strength; Yellow index
目 录
第一章 绪论 1
1。1 高分子材料的老化 1
1。1。1 老化的表现 1
1。1。2 老化的种类 1
1。1。3 影响老化的因素 1
1。1。4 防老化的措施 2
1。2 抗氧剂 2
1。2。1 抗氧剂的作用机理 2
1。2。2 抗氧剂的分类 3
1。2。3 抗氧剂的复配 尼龙6耐高温性能的研究:http://www.youerw.com/huaxue/lunwen_98275.html