Production method of fire retardant type magnesium hydroxide

Abstract

The invention provides a production method of fire retardant type magnesium hydroxide and relates to a production method of magnesium hydroxide. In the invention, a hexagonal flaky fire retardant type magnesium hydroxide product is obtained in one step under the condition that any crystal form regulating agent is not used by applying special technology, process and equipment based on magnesium chloride or magnesium nitrate or magnesium salt obtained by ammonia distillation reaction of light calcined powder and ammonium chloride or ammonium nitrate as a raw material. The production method provided by the invention has the characteristics of short process route, less operation steps, low temperature and pressure condition requirements, continuous and large-scale production and stable and reliable product quality; and by using the production method provided by the invention, the production cost of the current fire retardant type magnesium hydroxide product can be obviously reduced. Magnesium hydroxide produced by using the method provided by the invention can be used for producing high polymer material products such as electric wires, cable jackets and the like.

Description

technical field [0001] The invention relates to a production method of magnesium hydroxide, in particular to a production method of flame retardant type magnesium hydroxide. Background technique [0002] With the wide application of polymer material products, its flammability has also attracted people's attention. In order to solve the problem of ignition and combustion of flammable polymer materials, people have developed additive flame retardants and added them to polymer materials to make products. Additive flame retardants can be divided into organic flame retardants represented by halogen flame retardants and inorganic flame retardants represented by phosphorus, metal oxides and metal hydroxides. Although the effect of adding additives is good, it will produce toxic and corrosive gases when burned, and its application is more and more restricted. Magnesium hydroxide flame retardant has been widely used in the addition and treatment of polymer materials such as polyvin...

AI Technical Summary

Problems solved by technology

[0003] However, ordinary magnesium hydroxide has many disadvantages as a flame retardant: it has poor compatibility with polymers, and it is easy to reduce the processing performance and product quality when it is added in a large amount to the matrix material.

The two-step process is relatively complicated, and the operating conditions of the hydrothermal treatment process are relatively high, and strong alkaline substances such as sodium hydroxide and potassium hydroxide are required, resulting in high production costs

Although it has been reported in the literature that one-step preparation of magnesium hydroxide products with complete crystal forms can be achieved by adding a crystal form regulator during the synthesis process, but it has not been realized in industry.

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