Method for preparing aluminum hypophosphite

Abstract

The invention discloses a method for preparing aluminum hypophosphite. The method comprises the following steps that a certain amount of aluminum hydroxide is added to a reaction kettle with a stirring function, a certain amount of water is further added, the mixture is thoroughly stirred, and therefore the added materials are evenly scattered. An appropriate amount of hypophosphorous acid is dripped to the mixture at the temperature of 50 DEG C-100 DEG C and the reaction is kept for 3h-8h; the temperature of the mixture is reduced to the indoor temperature, the mixture is filtered and dried, and therefore the aluminum hypophosphite is obtained, wherein the volume of the water: the number of moles of the aluminum hydroxide: the number of moles of hypophosphorous acid = 1L: 1mol-2mol: 2mol-8mol. According to the method for preparing the aluminum hypophosphite, the yield is high, the technology is simple and easy to conduct, cost is low, the performance cost ratio is high, the obtained product is good in heat stability, and the application prospect is good.

Description

technical field [0001] The invention relates to a preparation method of aluminum hypophosphite. Background technique [0002] Aluminum hypophosphite has high phosphorus content, has the advantages of good thermal stability, low water solubility, and high flame retardant effect. It can be applied to modified plastics such as PA6 and PBT, and has good flame retardant effect. When added to PBT, the heat release rate and the heat generated during combustion will decrease sharply, and the amount of carbon formed after combustion will increase. The flame retardant performance can reach the UL94 standard V-0 level, and through experiments, it is better than the PBT flame retardant currently used in China. The flame retardant effect can be increased by 60%. The modified aluminum hypophosphite has good thermal stability, does not cause the decomposition of the polymer during processing, and does not affect the plastic molding composition. This product is poorly soluble in water and...

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Problems solved by technology

However, its research focuses on the application and comparison of various hypophosphite flame retardants in the direction of nylon 6, and there is no detailed introduction to the synthesis process of aluminum hypophosphite (Li Qifei. Synthesis of hypophosphite flame retardants and flame retardant nylon 6 Research, Northeast Forestry University, Master Thesis, 2011)

And in CN102786041A, sodium hypophosphite and aluminum sulfate are used to react under acidic conditions to generate aluminum hypophosphite, and the aluminum hypophosphite produced by this method is obviously lower than the acid-base neutralization method in terms of productivity.

There are no other reports on the synthesis of aluminum hypophosphite