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Hindered phenolic antioxidants in the profile of the introduction and application
发布时间:2016.10.17  浏览次数:
 

Hindered phenolic antioxidant is a kind of important antioxidants, it is widely used in natural rubber, synthetic rubber, polyolefin plastic and fibre and polymer materials, also can be used in the processing of petroleum products and fatty foods. The development of hindered phenolic antioxidants and research attention.

On structure and properties of dendritic macromolecules has carried on the brief introduction, and systematically reviewed the dendritic macromolecules in the synthesis and functionalization, on the basis of the latest research progress, for the first time put forward a new method of tree base conversion at the end of the macromolecular, through molecular design with antioxidant function of intermediate grafted onto the tree macromolecular, which for a class of new tree was successfully synthesized phenolic antioxidants. In beta - (3, 5-2 tertiary butyl - 4 - hydroxy phenyl) propionic acid methyl ester as a raw material, through hydrolysis reaction and halogen exchange reaction was synthesized with antioxidant function of intermediate beta - (3, 5-2 tertiary butyl - 4 - hydroxy phenyl) propionyl chloride (3, 5 - propionyl chloride), reaction conditions on the hydrolysis reaction were examined and the influence of the halogen exchange reaction; Through molecular design synthesis of 3, 5 - propionyl chloride grafted to a whole generation of dendritic macromolecules PAMAM1.0 G on the skeleton, new tree synthesized phenolic antioxidant, yield was 65%, the melting point of 202.2 ~ 205.2 ℃. 2, 6-2 tertiary butyl phenol as raw material, through nitration and reduction reaction to synthesize the intermediates 2, 6-2 tertiary butyl - 4 - aminophenol, and explores the conditions for the reaction and optimization. Finally explores the 2, 6-2 tertiary butyl - 4 - aminophenol and half generation dendritic macromolecules PAMAM0.5 G synthesis of new tree phenolic antioxidants reaction conditions, the coarse product yield was 66%, the melting point of 107.2 ~ 143.3 ℃. By elemental analysis, infrared spectrum of synthetic intermediates and new type of tree structure of phenolic antioxidants have been characterized, proves that the synthesis of molecular structure and design the structure of the target molecules. On this basis, the synthesis of a new type of phenolic antioxidants in the performance evaluation of the antioxidant, using DSC test the high density polyethylene and blank sample respectively added antioxidant 1076 and new tree phenolic antioxidants in the oxidation induction period of high density polyethylene (OIT), test results show that the new tree phenolic antioxidant has obvious antioxidant functions, oxidation induction period was 58.8 min, is under the same conditions of antioxidant 1076 1.8 times.