Method for preparing surface-modification ultrafine magnesium hydroxide

Abstract

The invention discloses a method for preparing surface-modification ultrafine magnesium hydroxide. The method includes the following steps that (1) ultrafine magnesium hydroxide with the particle size of 4,000 meshes to 6,000 meshes is selected, stirred and preheated for 20 min to 40 min in the stirring speed of 3,000 r / min to 6,000 r / min in a high-speed stirrer at the temperature of 50 DEG C to 100 DEG C; (2) then surface modifier and solvent are slowly and evenly added, the mixture continues to be stirred, the surface-modification time is 50 minutes to 90 minutes, and the modified ultrafine magnesium hydroxide is obtained. According to the modified ultrafine magnesium hydroxide prepared with the method, the good compatibility and the heat stability of the modified ultrafine magnesium hydroxide and a high polymer material are improved, and the mechanical performance, the processing fluidity and the like of the high polymer composite material can be remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of magnesium hydroxide, in particular to a preparation method of surface-modified ultrafine magnesium hydroxide. Background technique [0002] Magnesium hydroxide is a new type of inorganic filling flame retardant, which has many advantages such as wide sources, low price, good thermal stability, non-volatility, no precipitation, no toxic gas, no corrosion of processing equipment, and obvious smoke suppression effect. It has attracted much attention and is recognized as an excellent flame retardant with triple functions of flame retardancy, smoke suppression and filling in the rubber and plastic industry. Its flame retardant principle is to release bound water during thermal decomposition and absorb a large amount of latent heat to reduce the surface temperature of the synthetic material it fills in the flame, which can inhibit the decomposition of polymer and cool the combustible gas produced. At the same...

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Problems solved by technology

[0003] The flame retardant efficiency of magnesium hydroxide is low and the compatibility with the matrix resin is poor. To make the flame retardant performance of the flame retardant polymer material meet certain requirements, its addition amount often has to reach the total mass of the flame retardant polymer material. More than 60% of the flame retardant polymer material, which will have a great negative impact on the processing performance and mechanical properties of the flame retardant polymer material. Therefore, the conventional magnesium hydroxide powder is replaced by ultrafine magnesium hydroxide with a large specific surface area and high flame retardancy. However, due to the poor dispersion of ultrafine magnesium hydroxide in polymer materials, it is easy to agglomerate, and the mechanical properties and processing fluidity of the material are seriously affected.