Phosphate flame retardant containing styrene structure and synthesis method of phosphate flame retardant

Abstract

The invention discloses a phosphate flame retardant containing a styrene structure, which is prepared from phosphorous acid dialkyl ester, 4-hydroxy styrenes and carbon tetrachloride reacting under the existence of a catalyst. The catalyst is compound of organic alkali and inorganic alkali. The organic alkali catalyst is pyridine or triethylamine or diethylamine or phenylamine or triethanolamine or diethanol amine or alkyl benzene amine or tetrabutylammonium hydroxide or tetraethylammonium hydroxide; the inorganic alkali catalyst is sodium bicarbonate or potassium bicarbonate or sodium hydroxide or potassium hydroxide or sodium carbonate or potassium carbonate or sodium benzoate or potassium benzoate; the molar ratio of the organic alkali to the 4-hydroxy styrenes is 3-1 to 1, and the molar ratio of the inorganic alkali to the 4-hydroxy styrenes is 1.1-1 to 1. A phosphate molecule contains active double bonds and is easily subjected to polymerization reaction together with the active double bonds such as styrene and the like. The carbon tetrachloride is adopted as a solvent to react at the low temperature in a synthesis process. The synthesis method has the advantages of high reaction yield, convenience for reaction operation, easiness of industrialization and the like compared with the traditional phosphoryl chloride method.

Description

technical field [0001] The invention relates to a phosphate ester flame retardant containing styrene structure and a synthesis method thereof. technical background [0002] Phosphate ester flame retardants have been widely used in various plastics such as polyvinyl chloride, polyester, and polyurethane due to their excellent processing and flame retardant properties. Most of the traditional flame retardants are added to the substrate in the form of blending during processing, so as to endow the material with certain flame retardant properties. This method is easy to operate and easy to produce. Its shortcoming is that because the flame retardant is added in the form of physical blending, it deteriorates the mechanical and impact resistance of the material and other physical properties. [0003] The traditional synthetic method of phosphoric acid ester is generally prepared by reacting phosphorus oxychloride and corresponding alcohol at a certain temperature. When prepared ...

AI Technical Summary

Problems solved by technology

The disadvantage is that because the flame retardant is added in the form of physical blending, it deteriorates the physical properties of the material such as mechanics and impact resistance.

When prepared by this method, a large amount of hydrogen chloride gas will be generated in the system, and hydrogen chloride will undergo chlorination reaction with raw material alcohol, and the reaction yield is low, which not only wastes raw materials but also causes difficulty in product separation

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