The Synthesis Of Antioxidant Using For Polymer Processing

Polymers in the melt molding process due to high temperature, often accompanied bya series of oxidation process. If this oxidation process can not be suppressed, it willaffect the mechanical properties of materials, with a result, reduce the service life ofmaterials.It has been studied in great detail about the aging mechanism of polymer andaccumulation of a large number of literature. In short, the process of thermal oxidationof polymers including the break of polymeric chains, the generation of carbonyl oxidefree radical and hydrogen peroxide.The addition of a small amount of antioxidants in polymer processing (usually a fewthousandths) can effectively inhibit the thermal oxidation process. At present, the mostwidely used of the sort of antioxidants is hindered phenolic antioxidant and phosphiteantioxidant, these two kinds of antioxidants can have preferable result when used alone,the combination of two can also play a good synergistic effect.The main work of this thesis are as follows:1. Design a new type of phosphite antioxidant Tert butyl hydroquinone bis phosphiteester four (2,4-ditertbutyl phenol) ester. Using2,4-ditertbutyl phenol, Tert butylhydroquinone, phosphorus trichloride as the main raw material to synthesize the targetproduct; the molecular structure of the product was identified by infrared, nuclearmagnetic resonance, phosphorus content. To improve the yield by means ofoptimization of reaction conditions. To improve the economic benefit by solventrecovery experiment.2. Optimize the synthesis of antioxidant Methylene-4426-S; To improve the economicbenefit by mother liquor circulation test and solvent recovery experiment.