改性硅胶接枝抗氧剂的合成及应用-化学工艺专业论文.docxVIP

兰州 兰州交通大学硕士学位论文 改性 改性硅胶接枝抗氧剂的合成及应用 万方数据 万方数据 万方数据 万方数据 摘 要 受阻酚类抗氧剂是一些酚类化合物，具有空间位阻，其热氧化效果显著，不污染产 品，发展迅速。这样的抗氧化剂，主要用于塑料，合成纤维，乳胶，石油产品，食品， 药物和化妆品。 在本文中，在硅烷偶合剂的作用下，首先将硅胶表面氨基功能化，再与丙烯酸甲酯 发生迈克尔加成反应，反应生成的酯与乙二胺进行交换反应，重复上面的步骤，直到合 成 2.0 代的聚酰胺胺改性硅胶（2.0G SG-PAMAM）。具有抗氧剂 264 结构的中间体 β-(3,5 -二叔丁基-4-羟基苯基)丙酰氯被设计接枝到整代 PAMAM-SG 骨架上，2,6-二叔丁基-4- 氨基苯酚接枝到半代的 PAMAM-SG 的骨架上，得到两类（A 类、B 类）以硅胶为核的 新型受阻酚类抗氧剂。将合成的抗氧剂与聚丙烯（PP）熔融共混，压成薄板，进行加速 光-热氧化降解试验。通过红外、扫描电镜、综合热分析对中间体和合成的抗氧剂进行 相 关 表 征 测 试 ， 并 对 合 成 的 抗 氧 剂 进 行 抗 氧 化 性 能 评 价 。 改 性 硅 胶 接 枝 抗 氧 剂 （SG-PAMAM-AO）在 PP 中表现出比聚酰胺胺改性硅胶（SG-PAMAM）更好的分散状 态；在 PP 中添加 SG-PAMAM 和 SG-PAMAM-AO 提升了材料的热稳定性，SG-PAMAM -AO 比 AO（2,6-二叔丁基苯酚）和 BHT 具有更好的抗氧化性能。 关键词：受阻酚类抗氧剂；聚酰胺胺；改性硅胶；聚丙烯；复合物；氧化降解; 论文类型：应用研究 I - Abstract Hindered phenolic antioxidants are some phenolic compounds with steric hindrance. Because of their remarkable thermal oxidation effect and not contaminating products, they have shown great progress. These antioxidants are primarily utilized in plastics, synthetic fibers, rubber, petroleum products, food, medicine and cosmetics. In this paper, silica was amino-functionalize by using a kind of silane coupling agent on its surface at first, then the modified silica was reacted with methyl acrylate and ethylene diamine alternatively and repeatedly till the poly amidoamine-modified silica (PAMAM-SG) was 2.0 generation. The antioxidant intermediate β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride was designed to graft onto the integral generation PAMAM-SG skeleton and another antioxidant intermediate 2,6-tert-butyl-4-amino-phenol was designed to graft onto the half generation PAMAM-SG skeleton in order to obtain two new types (Class A and B) hindered phenolic antioxidant with the silica gel as the core. The synthetic antioxidant was melt blended with polypropylene (PP), then obtained composites were pressed into sheets for photo-thermal aging test. Synthetic intermediates and antioxidants were characterized by infrared, scanning electron microscopy (SEM) and sim