A kind of preparation method of bis(2,4-dicumylphenyl) pentaerythritol diphosphite

Abstract

The embodiment of the invention discloses a preparation method of bis(2,4-dicumylphenyl)pentaerythritol diphosphite. Add phosphorus trichloride dropwise to pentaerythritol, amine hydrochloride catalyst, and aromatic hydrocarbon solvent at a reaction temperature of 5-10°C and slightly reduced pressure, then raise the temperature to 85-90°C in stages, and react under reduced pressure for 1 hour After stopping the decompression, fill with nitrogen protection to obtain the dichloropentaerythritol diphosphite reaction solution; add the above reaction solution dropwise to the aromatic hydrocarbon solvent of 2,4-dicumylphenol heated to 90-100°C, and depressurize Reflux reaction for 4 hours, feed nitrogen, add mixed amine to adjust the reaction system to be alkaline, cool down to room temperature, and filter to obtain bis(2,4-dicumylphenyl)pentaerythritol diphosphite. The invention finally obtains a high-performance product with high yield, narrow melting range, low acid value and excellent hydrolysis resistance through strict control of reaction conditions, such as temperature, pressure, time, catalyst, feeding sequence and post-treatment.

Description

technical field [0001] The invention relates to the technical field of preparation technology of phosphite antioxidant, in particular to a preparation method of bis(2,4-dicumylphenyl)pentaerythritol diphosphite. Background technique [0002] At room temperature and higher temperature, most polymers will undergo auto-oxidation reactions with varying speeds, which cause plastic yellowing, degradation and strength reduction, that is, plastics have undergone aging effects, and any substance that can inhibit or delay this reaction Can be called antioxidants. The reason for aging is that plastics are oxidatively degraded due to the action of light, oxygen, and heat, and the way to eliminate or alleviate the aging degradation of plastics is to add antioxidants to plastics. Therefore, the use of antioxidants is indispensable in the application of various plastic products such as polypropylene, polyethylene film, high-density polyethylene injection molding products, ABS, polycarbona...

AI Technical Summary

Problems solved by technology

This method requires extremely high temperature control, a little carelessness will bring a lot of impurities, and the purity of the product is not easy to guarantee, usually the purity does not exceed 90%.

[0007] The second kind: first generate the intermediate dichloropentaerythritol diphosphite of phosphorus trichloride and pentaerythritol, although high-purity antioxidant 9228 can be synthesized, due to the addition of excessive 2,4-dicumylphenol, resulting in the final The yield is low. According to existing literature reports, the yield generally does not exceed 70%, and there is a large amount of reaction catalyst residue, which affects the final use effect of the antioxidant 9228