含磷抗氧化劑之製程研究

• Main Author: 楊世培
• Other Authors: 王春山
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/08764255350757779011

碩士 === 國立成功大學 === 化學工程學系 === 87 === Antioxidants are widely used in polymers, petroleum products, and food, especially in plastics and rubber goods. Their major function is to retard or prevent polymers from degradation caused by reaction with atmospheric oxygen. There are basically four types of antioxidants: (1) Amines, (2) Hindered phenols, (3) Phosphites, (4) Sulfides. Although the phenolic antioxidants are used in greater quantities than the other classes of antioxidants, however, the BHT antioxidant is unstable when it is processed at high temperature. So, it's growth is limited . On the other hand, the organophosphorus antioxidant as the secondary antioxidant will grow rapidly because of its excellent compatibility with uv stabilizer and ordorless. Therefore, the synthesis of various phosphorus antioxidants is chosen as the subject of present study. Following results are obtained : (1) For the synthesis of 2,2'-Methylenebis(4,6-di-tert-butyl phenol); using toluene as a solvent, and PTSA as a catalyst, high purity products with high yield was obtained by a simple process. (2) For the synthesis of tri(2,4-di-tert-butyl phenyl) phosphite (TBPP); triethylamine was used as a catalyst with slow addition of PCl3; the precipitated salt was filtered off, the filtrate was evaporated in a vacuum, and the rude product was obtained. After washing the product with methanol several times, a high purity product in 75.6% yield was obtained. (3) For the synthesis of 1,1,1-(2,4-di-tert-butyl phenyl)-(2,2'-methylenebis(4,6-di-tert-butyl phenyl ) ) phosphite (TIPH) ; the intermediate ,(2,4-di-tert-butyl phenyl) dichlorophosphite, was reacted with 2,2'-methylenebis(4,6-di-tert-butyl phenol) to form the final product. After washing the product with methanol several times, a high purity product in 62.5% yield was obtained. (4) For the synthesis of 1,1,1-(2,2'-methylenebis(4,6-di-tert-butyl phenyl))-(n-octanyl) phosphite (DI-8C); the intermediate, n-octanyl dichlorophosphite was reacted with 2,2'-methylenebis(4,6-di-tert-butyl phenol) to form the final product. After washing the product with methanol several times, a high purity product in 50.3% yield was obtained. (5) For the synthesis of 1,1,1-(2,2'-methylenebis(4,6-di-tert-butyl phenyl))-(n-octadecanyl) phosphite (DI-18C); the intermediate, n-octadecanyl dichlorophosphite was reacted with 2,2'-methylenebis(4,6-di-tert-butyl phenol) to form the final product. After washing the product with methanol several times, a high purity product in 43.6% yield was obtained.