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Magnesium hydroxide, method for production thereof and flame-retarder comprising the magnesium hydroxide, and flame-retardant resin composition containing the magnesium hydroxide

A technology of magnesium hydroxide and manufacturing methods, applied in the direction of magnesium hydroxide, etc., to achieve the effect of high specific surface area

Inactive Publication Date: 2011-12-14
NOZAWA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that the manufacturing process required to purify such seawater-derived magnesium hydroxide requires a huge cost.

Method used

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  • Magnesium hydroxide, method for production thereof and flame-retarder comprising the magnesium hydroxide, and flame-retardant resin composition containing the magnesium hydroxide
  • Magnesium hydroxide, method for production thereof and flame-retarder comprising the magnesium hydroxide, and flame-retardant resin composition containing the magnesium hydroxide
  • Magnesium hydroxide, method for production thereof and flame-retarder comprising the magnesium hydroxide, and flame-retardant resin composition containing the magnesium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1. Manufacture of magnesium hydroxide (refer to figure 1 flow chart)

[0055] (1) Using acid solution to chemically decompose magnesium-containing substances

[0056] The powder obtained by pulverizing and classifying serpentinite (the powder sieved through a 50-mesh sieve, with an average particle diameter of 300 microns and a BET specific surface area of ​​8 m 2 / g) is added in water to form a suspension, to obtain a slurry, slowly add sulfuric acid (concentration 98%) that is 15% more than the theoretical value of the sulfuric acid amount required for the dissolution of all magnesia in serpentine to this slurry, while This was stirred while heating to 100°C.

[0057] (2) filter

[0058] The above slurry was filtered to obtain magnesium sulfate solution.

[0059] (3) Preparation of primary alkaline solution

[0060] A solution in which the pH of the solution was adjusted to 8 while stirring while adding a 20% sodium hydroxide solution to the magnesium sulfate so...

Embodiment 2

[0083] (1) Recovery of asbestos

[0084] Asbestos-containing construction material (corrugated asbestos tile) waste is crushed and classified, and the contained asbestos (powder passed through a 450-micron sieve) is recovered.

[0085] (2) Using acid solution to chemically decompose magnesium-containing substances

[0086] The above-mentioned asbestos powder is immersed in water to form a suspension to obtain a slurry, and slowly add sulfuric acid (concentration 98%) that is 15% more than the theoretical value of the acid required to dissolve all the magnesium oxide in the asbestos to the slurry, while heating to 100 °C while stirring for two hours.

[0087] (3) filter

[0088] The above slurry was filtered to obtain a magnesium sulfate solution.

[0089] (4) Preparation of primary alkaline solution

[0090] The pH of the solution was adjusted to 8 while stirring while adding 20% ​​sodium hydroxide solution to the magnesium sulfate solution. As a result, impurities (iron ...

Embodiment 3

[0113] Utilize that the serpentinite as a magnesium-containing material is pulverized and classified, and the obtained powder (the powder passed through a sieve with a mesh size of 450 microns) is used, and the same procedure as in Example 1 (refer to figure 1 The flow process) is carried out using acid solution to chemically decompose magnesium-containing substances, filter magnesium-containing slurry, prepare primary alkali solution, prepare secondary alkali solution, and recover magnesium hydroxide to obtain magnesium hydroxide in Example 3 of the present invention.

[0114] Again, for comparison with the two-stage process of the present invention, the figure 1 The manufacturing process of shown magnesium hydroxide removes the process of the preparation process of primary alkaline solution (the process without impurity removal process, refer to figure 2 process). That is to say, as the process of the comparative example, using the powder obtained by pulverizing and clas...

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Abstract

The present invention provides a magnesium hydroxide with a large specific surface area. The substance containing magnesium is immerged into the acid solution and is chemically decomposed, the aqueous alkali is added into the obtained acid solution and the alkalescent primary aqueous alkali, when the impurity of the primary aqueous alkali is eliminated, the aqueous alkali is afresh added to the primary aqueous alkali and the alkalic secondary aqueous alkali is obtained, the magnesium is caused to separate out from the secondary aqueous alkali to make the magnesium hydroxide.

Description

technical field [0001] The present invention relates to magnesium hydroxide having a high specific surface area and a method for producing the same. More specifically, the present invention relates to magnesium hydroxide capable of imparting flame retardancy and an excellent reinforcing effect by blending in a resin and a method for producing the same. It also relates to a flame retardant composed of the magnesium hydroxide and a flame retardant resin composition containing the magnesium hydroxide. Background technique [0002] Traditionally, thermoplastic resins have excellent moldability and excellent mechanical and electrical properties, especially flame-retardant resin compositions containing halogen flame retardants such as tetrabromobisphenol A and decabromodiphenyl oxide, etc. It is widely used in various industrial fields such as construction, electricity, machinery, and transportation. [0003] In particular, polyvinyl chloride resin compositions containing haloge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/14C08K7/08C08K3/22C08L23/00
CPCC08K3/22C01F5/22C01P2006/80C01P2006/12
Inventor 山下喜世次岛村哲也
Owner NOZAWA CORP
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