Preparation method of nano molybdenum oxide hybrid magnesium hydroxide flame retardant

Abstract

The invention relates to a preparation method of a nano molybdenum oxide hybrid magnesium hydroxide flame retardant. The method includes the following steps that 1, MgCl2 6H2O is used for preparing amagnesium chloride solution with the concentration of 0.1-1.0 mol / L; 2, solid NaOH is added into the magnesium chloride solution and dissolved through stirring, and magnesium hydroxide slurry is obtained; 3, (NH4)6Mo7O24 4H2O is used for preparing an ammonium molybdate solution with the concentration of 0.014-0.14 mol / L; 4, under stirring, the ammonium molybdate solution is added into the magnesium hydroxide slurry to obtain mixed slurry; 5, the mixed slurry is transferred to a hydrothermal reaction kettle, placed in a homogeneous phase reactor for reaction, and naturally cooled to room temperature after reaction is over, and white suspension liquid is obtained; 6, the white suspension liquid is filtered, washed and dried, and a nano molybdenum oxide hybrid magnesium hydroxide flame-retardant sample is obtained. The process is simple, and the obtained product has special morphology and better flame retardancy and smoke suppression performance.

Description

technical field [0001] The invention relates to the field of chemical material preparation, in particular to a preparation method of a nanomolybdenum oxide hybrid magnesium hydroxide flame retardant. Background technique [0002] Magnesium hydroxide is one of the commonly used flame retardants. It has the characteristics of environmental protection, non-toxicity, and low price. It is widely used in the flame retardant field of polymer materials such as plastics and rubber. However, magnesium hydroxide still has the disadvantages of low flame retardant efficiency, poor smoke suppression effect, and poor dispersibility. It often needs to be added in large quantities to achieve a good flame retardant effect, which leads to a sharp decline in the processing performance and mechanical toughness of the matrix. Serious affect its scope of application. In response to this problem, many researchers have carried out in-depth exploration and proposed corresponding solutions, which can...

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Problems solved by technology

[0009] At present, there are research reports on the low flame retardant efficiency and large addition amount of magnesium hydroxide by the above three types of methods, but in fact, there are more or less problems: (1) surface modification has limited improvement in the flame retardant performance of magnesium hydroxide, This is because surface modifiers (such as fatty acids and their salts, silane coupling agents, etc.) are usually organic compounds with long molecular carbon chains, which have certain flammability, which is not conducive to the improvement of flame retardancy.

(2) Although the composite method can effectively reduce the amount of magnesium hydroxide added, the addition of other fillers will also introduce different problems: such as halogen-based and phosphorus-based flame retardants are highly toxic and easy to pollute the environment; zinc borate, hydroxytin Zinc acid and carbon-based flame retardants are more expensive, all offset the advantages of magnesium hydroxide flame retardants to a certain extent

(3) The morphology control method also has the problem of adding additives, and there is no report on the improvement of the smoke suppression performance of magnesium hydroxide

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