Impinging stream-rotating disc coupling reaction device and ultrafine magnesium hydroxide fire retardant synthesis method using impinging stream-rotating disc coupling reaction device

Abstract

The invention relates to application of an impinging stream-rotating disc coupling reaction device in preparation of an ultrafine magnesium hydroxide fire retardant, and belongs to the technical field of reaction devices of inorganic chemical industry. The impinging stream-rotating disc coupling reaction device comprises an impinging stream-rotating disc coupling reactor, the impinging stream-rotating disc coupling reactor comprises a housing, a circular disc is arranged at the center inside the housing, and the circular disc can rotate with a rotating shaft, an A liquid inlet pipe and a B liquid inlet pipe are arranged on the top of the housing, a liquid redistributor is connected to the lower end of the A liquid inlet pipe and the B liquid inlet pipe, two nozzles at the lower end of the A liquid inlet pipe and the B liquid inlet pipe are oppositely and symmetrically arranged, the liquid redistributor is arranged above the circular disc, an A liquid storage tank and a B liquid storage tank are respectively arranged at the two sides of the reactor, and the A liquid storage tank and the B liquid storage tank are respectively connected with the A liquid inlet pipe and the B liquid inlet pipe of the reactor via pumps and flowmeters. The device has the advantages of simple structure, high mixing efficiency, stable operation, low energy consumption and easy maintenance, and a prepared product has good dispersibility and uniform particle size distribution.

Description

[0001] technical field [0002] The invention relates to an impinging flow-rotating disk coupling reaction device and a method for synthesizing ultrafine magnesium hydroxide flame retardant, belonging to the technical field of inorganic chemical industry. Background technique [0003] With the rapid development of the polymer material industry, polymer materials such as plastics, synthetic rubber, and synthetic fibers are more and more widely used in building materials, home appliances, electronic equipment, chemicals, transportation and other fields. However, the flammability of polymer materials has attracted more and more attention. According to statistics, more than 30% of fatal accidents in fires are caused by dense smoke and toxic gases produced by materials. Therefore, for flammable products, in addition to studying the flame retardant effect of adding flame retardants, low toxicity and low smoke are also indispensable indicators for flame retardants, which is also t...

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Problems solved by technology

Due to the uncontrollable composition of natural minerals in the former method, the product contains a large amount of impurities and poor performance; investigations and studies have shown that most of the industrial production of magnesium hydroxide at home and abroad adopts chemical synthesis.

But there are the following problems in the preparation of superfine magnesium hydroxide by chemical synthesis: (1) the particle size distribution of the synthetic magnesium hydroxide is uneven; The secondary particles of 100 μm are dispersed; (3) The filtration performance of magnesium hydroxide filter slurry is poor and it is not easy to separate

Many studies have been carried out around this problem at home and abroad, but the equipment used is huge, the production energy consumption is large, the cost is high, and the mixing efficiency is low, so it is difficult to provide an ideal reaction environment for the precipitation reaction.

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