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Ultra-fine magnesium hydroxide surface modifying method

A superfine magnesium hydroxide and surface modification technology, which is applied in the treatment of dyed polymer organic compounds, fibrous fillers, etc., can solve the problems of large specific surface area and surface energy, easy agglomeration, and hindering the performance of ultrafine powders , to achieve the effects of good dispersion, low cost, strong compatibility and affinity

Inactive Publication Date: 2008-05-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the particle size decreases, the specific surface area and surface energy are very large, and it is easy to agglomerate during use, and the existence of agglomeration will greatly hinder the performance of ultrafine powders. Therefore, the study of ultrafine powders Surface modification will be the premise and basis for further improving material performance

Method used

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  • Ultra-fine magnesium hydroxide surface modifying method

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Effect test

Embodiment 1

[0014] (1) Weigh a certain amount of MgCl 2 ·6H 2 O was dissolved in deionized water into a solution A with a concentration of 20% (wt), and filtered to remove insoluble impurities for use.

[0015] (2) A certain amount of concentrated ammonia water is prepared into a 15% (wt) aqueous solution B with deionized water, and the insoluble impurities are filtered off for later use.

[0016] (3) Add 0.1% or 2% or 5% (percentage by weight) of C of magnesium hydroxide content in solution A 12～14 Alkyl glucoside or polyethylene glycol (M=3000), after stirring evenly, add dropwise to the ammonia solution B under stirring, and react at a temperature of 20°C to 25°C for 1.5 hours to make the reaction system The pH value of the magnesium hydroxide is 8.5, and the reactant is filtered, washed, and dried at a temperature of 120° C. for 2 hours to obtain a white modified ultrafine magnesium hydroxide powder. Observed by H-600 transmission electron microscope, it has good dispersion and sma...

Embodiment 2

[0018] (1) Weigh a certain amount of MgCl 2 ·6H 2 O was dissolved in deionized water to form solution A with a concentration of 15% (wt), and insoluble impurities were filtered off for use.

[0019] (2) A certain amount of urea is prepared into a 20% (wt) aqueous solution B with deionized water, and the insoluble impurities are filtered out for use.

[0020] (3) Add 0.5% or 2.5% or 5% (percentage by weight) of C of magnesium hydroxide content in solution A 12～14 Alkyl glucoside or polyethylene glycol (M=3000), after stirring well, add dropwise to the urea solution B under stirring, and react for 2 hours at a temperature of 85-100°C to make the reaction The pH value of the system is 8.5, and the reactant is filtered, washed, and dried at a temperature of 120° C. for 2 hours to obtain a white modified ultrafine magnesium hydroxide powder. Observed by H-600 transmission electron microscope, it has good dispersion and small particle size.

Embodiment 3

[0022] (1) Weigh a certain amount of MgCl 2 ·6H 2 O was dissolved in deionized water into a solution A with a concentration of 25% (wt), and insoluble impurities were filtered off for use.

[0023] (2) A certain amount of concentrated ammonia water is prepared into a 10% (wt) aqueous solution B with deionized water, and the insoluble impurities are filtered off for later use.

[0024] (3) Add 0.1% or 2% or 5% (percentage by weight) of C of magnesium hydroxide content in solution A 12～14 Sodium alkyl ether carboxylate, or C 8～12 Alkylphenol ether sodium carboxylate, after stirring well, add it dropwise to the ammonia solution B under stirring, and react for 1.5 hours at a temperature of 20-25°C, so that the pH value of the reaction system is 8.5, and the reaction The material was filtered, washed, and dried at a temperature of 120° C. for 2 hours to obtain a white modified ultrafine magnesium hydroxide powder. Observed by H-600 transmission electron microscope, it has good ...

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Abstract

The invention discloses a method for surface modification of superfine magnesium hydroxide. The method is to add a surface modifier to an aqueous solution of inorganic water-soluble magnesium salt, and slowly add it to the reaction with a precipitating agent in a stirring state. In the kettle, react at a temperature of 20°C to 100°C for 1-2 hours, and then filter, wash and dry the reaction solution to obtain the finished product. The invention utilizes the steric hindrance effect and coating effect of the surface modifier to effectively control the particle size of magnesium hydroxide, and obtains ultra-fine magnesium hydroxide with good dispersibility, strong functionality and high flame-retardant efficiency, and The process is simple, the raw materials are easy to obtain and the cost is low, non-toxic and pollution-free, and can be widely used in polymer material industries such as plastics, rubber, building materials and unsaturated polyester.

Description

technical field [0001] The invention relates to a method for surface modification of magnesium hydroxide, specifically a method for surface modification of superfine magnesium hydroxide by using modifiers as nonionic surfactants and anionic surfactants. In order to obtain high-performance ultra-fine magnesium hydroxide. Background technique [0002] In recent years, the production of polymer synthetic materials has developed rapidly, and their applications in various fields such as industry, agriculture, and national defense have become more popular, and they have played a huge role in the construction of the national economy. However, since most of these materials are combustible or inflammable, they are accompanied by a large amount of smoke and irritating and toxic gases during combustion. These gases and dense smoke will not only endanger people's lives, but also seriously corrode equipment and buildings, and at the same time pose a threat to fire protection. Work bring...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/10
Inventor 曲华王宏伟张义叶
Owner TAIYUAN UNIV OF TECH
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