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Colloidal-silica-coated magnesium hydroxide

A magnesium hydroxide, coating technology, applied in the direction of magnesium hydroxide, silicon oxide, silicon dioxide, etc., can solve the problem of damage to the appearance, and achieve the effect of high flexural modulus of elasticity and impact resistance

Inactive Publication Date: 2017-08-22
KYOWA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not suitable for applications requiring matteness, such as automotive interior parts
[0006] In addition, magnesium hydroxide itself tends to react with acid, and when using acidic paint, etc., it will swell with the generation of water, causing a problem of impairing the appearance

Method used

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  • Colloidal-silica-coated magnesium hydroxide
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  • Colloidal-silica-coated magnesium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] First, based on the method described in Patent Document 1 (International Publication No. 2011 / 073766), a mixed aqueous solution of magnesium chloride and sodium acetate (Mg=1.0 mol / L, sodium acetate=0.5 mol / L, 30° C. ), 3.4 L of 2 mol / L sodium hydroxide aqueous solution (30° C.) was added under stirring to carry out coprecipitation reaction. 1 L of the reactant was taken out, and hydrothermal treatment was performed at 160° C. for 5 hours in an autoclave. After cooling to below 100°C, it was taken out from the autoclave, filtered, washed with water, dried, and pulverized to obtain magnesium hydroxide powder sample 1. Table 1 shows the aspect ratio of the obtained powder.

[0061] Then, the powder sample 1 was emulsified in water to prepare a slurry so that the solid content concentration was 30g / L and the liquid volume was 1.55kL, and heated to 80°C while stirring, and silica gel (Cataloid SI-30 (NGC Catalytic Chemicals Co., Ltd., average particle size 12nm, SiO 2 Co...

Embodiment 2

[0063] Powder sample 3 was obtained in the same manner as in Example 1, except that the addition was converted to SiO 2 4.0% by weight of silica gel with respect to 100% by weight of magnesium hydroxide. Table 1 shows the aspect ratio of the obtained powder.

Embodiment 3

[0064] Embodiment 3 (preparation of resin composition)

[0065] 6 parts by weight of the powder sample 2 prepared in Example 1, 100 parts by weight of polypropylene, and 12 parts by weight of talc were mixed and melt-kneaded at about 180° C. using a twin-screw extruder to form pellets. Using the obtained pellets, a test piece was formed by an injection molding machine at about 200° C., and its physical properties were measured. The results are shown in Table 2.

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Abstract

The purpose of the present invention is to provide magnesium hydroxide endowed with both low gloss and the acid resistance required as an application property of paint. The present invention is coated magnesium hydroxide including magnesium hydroxide and colloidal silica coating the surface thereof, in which (A) the coating amount of colloidal silica is 0.1-20 wt% per 100 wt% of magnesium hydroxide in terms of SiO2, and (B) the major axis (width) is 0.5-20 [mu]m, the thickness is 0.01-0.5 [mu]m, and the aspect ratio is 10 or higher.

Description

technical field [0001] The present invention relates to a coated magnesium hydroxide obtained by uniformly coating a surface with silica gel, a method for producing the same, a low-gloss and acid-resistant resin composition compounded with the coated magnesium hydroxide, and a molded article thereof. Background technique [0002] Magnesium hydroxide is one of the few substances with the highest level of non-toxicity, which is used in antacids (gastric acid neutralizers), stabilizers for vinyl chloride, laxatives, exhaust gas desulfurizers (flue gas desulfurizers), bitter soil fertilizers , food additives (magnesium enhancer) and other widely used. Among them, when used as an additive for resins, its use value is highly evaluated especially for resin products that exist in people's daily life because of its safety of not generating toxic gas. When magnesium hydroxide is compounded in a resin, characteristics such as flame retardancy (heat absorption at the time of thermal de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14C08K9/02C08L101/00
CPCC01F5/14C08K9/02C01P2004/03C01P2006/12C08K2201/003C08K2201/016C09C1/02C08L23/12C01B33/14C08K3/22C01P2004/80C01P2004/54C08K2003/2224C08L101/00C01P2004/61C01P2004/62C01P2004/84C08K3/36C09C1/028
Inventor 大堀康平宮田茂男
Owner KYOWA CHEM IND
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