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Prepn of magnesium hydroxide for fire retardant

A magnesium hydroxide and flame retardant technology, applied in the field of chemical materials, can solve the problems of poor dispersibility and compatibility, large equipment investment and high production cost, and achieve uniform particle size distribution, simple production process and crystallinity. good effect

Inactive Publication Date: 2007-08-15
山东凯利隆化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] These preparation processes have some problems in varying degrees, such as difficult separation of products, large equipment investment, low production efficiency, high production cost, etc.
At the same time, the common magnesium hydroxide produced by these methods has a large surface area, and the particles are easy to gather into agglomerates, and the dispersibility and compatibility in polymer synthetic materials are very poor, so they cannot be directly used for flame retardancy of materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The raw material light-burned magnesia and water are fully mixed according to the mass ratio of 1:2. During the stirring process, an aqueous solution of sodium hydroxide equivalent to 2 times the volume of the mixture of light-burned magnesia and water is added dropwise, and the concentration of sodium hydroxide is controlled so that the final The sodium hydroxide concentration of the system is 4M. After stirring for about 30 minutes, it is transferred into a high-pressure reactor with a filling degree of 80%. 160°C, hydrothermal reaction for 10 hours, the resulting product was naturally cooled to room temperature, and then washed and dried to obtain flake magnesium hydroxide for flame retardants. The transmission electron microscope picture of the product is shown in Figure 1a, the scanning electron microscope picture is shown in Figure 2, the electron diffraction pattern is shown in Figure 3, and the XRD spectrum is shown in Figure 4.

Embodiment 2

[0018] The raw material light-burned magnesia and water are fully mixed at a mass ratio of 1:1.5. During the stirring process, an aqueous solution of sodium hydroxide equivalent to 3 times the volume of the mixture of light-burned magnesia and water is added dropwise to control the concentration of sodium hydroxide. Make the sodium hydroxide concentration of the final system 5M, stir for 40 minutes and then transfer to a high-pressure reactor with a filling degree of 75%. Hydrothermal reaction at 170°C for 8 hours, the resulting product was naturally cooled to room temperature, and then washed and dried to obtain flake magnesium hydroxide for flame retardants. The TEM photo of the product is shown in Figure 1b.

Embodiment 3

[0020] The raw material light-burned magnesia and water are fully mixed according to the mass ratio of 1:3. During the stirring process, an aqueous sodium hydroxide solution equivalent to 1.5 times the volume of the mixture of light-burned magnesia and water is added dropwise, and the concentration of sodium hydroxide is controlled so that the final The sodium hydroxide concentration of the system is 6M. After stirring for about 50 minutes, it is transferred into a high-pressure reactor with a filling degree of 80%. 180°C, hydrothermal reaction for 6 hours, the resulting product was naturally cooled to room temperature, and then washed and dried to obtain flake magnesium hydroxide for flame retardants. The TEM photo of the product is shown in Figure 1c.

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Abstract

The preparation process of magnesium hydroxide for fire retardant belongs to the field of chemical material technology. The preparation process includes the steps of: mixing the main material light burnt magnesia and water in the weight ratio of 0.5-3 to 3-7, dropping sodium hydroxide aqua while stirring to ultimate sodium hydroxide concentration in the system of 4-6 M, stirring for 10-60 min before transferring to a high pressure reactor to a filling degree of 70-80 %, hydrothermal reaction at 140-180 for 6-10 hr, cooling the product naturally, water washing and stoving to obtain the flake magnesium hydroxide for fire retardant. The preparation process has the advantages of simplicity and low cost, and the prepared magnesium hydroxide product has excellent crystallization, regular shape and homogeneous crystal size distribution and is suitable for use in fire retardant.

Description

(1) Technical field [0001] The invention relates to a method for preparing magnesium hydroxide for a flame retardant by a hydrothermal process, and belongs to the technical field of chemical materials. (2) Background technology [0002] Magnesium hydroxide is a new type of inorganic flame retardant developed in recent years. It has the advantages of thermal stability, non-volatility, no toxic gas generation, and no corrosion of processing equipment. Magnesium hydroxide is a chemical raw material rich in crystal water. When it is decomposed by heat to release a large amount of crystal water, it absorbs a large amount of heat energy to reduce the temperature of the heated body to prevent the flame from generating or spreading. The magnesium oxide produced by it itself is a good refractory material, which is why it can be used as a flame retardant raw material, and magnesium hydroxide is an additive inorganic flame retardant, which has better flame retardant performance than si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K21/02
Inventor 孙思修赵伟由婷叶虹
Owner 山东凯利隆化工有限公司
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