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Magnesium oxide particles, method for producing same, heat dissipating filler, resin composition, heat dissipating grease, and heat dissipating coating composition

A technology of magnesium oxide particles and resin composition, applied in the direction of magnesium oxide, coating, etc., can solve the problems of poor filling, serious wear of the mixing machine, no records, etc., and achieve the effect of narrow particle size distribution

Active Publication Date: 2012-05-23
SAKAI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, alumina has the following disadvantages: the Mohs hardness is high, so in the production process of heat sinks, etc., the wear of the kneading machine is serious.
In addition, aluminum nitride has the following disadvantages: it is poor in filling properties, so it is difficult to highly fill it into the resin.
In addition, aluminum nitride also has the following disadvantages: it is expensive, so that the heat dissipation parts become expensive
However, in Patent Document 1, although it is described that the primary particle size is controlled, it does not describe the particles whose particle aggregation ratio and particle distribution are controlled.

Method used

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  • Magnesium oxide particles, method for producing same, heat dissipating filler, resin composition, heat dissipating grease, and heat dissipating coating composition
  • Magnesium oxide particles, method for producing same, heat dissipating filler, resin composition, heat dissipating grease, and heat dissipating coating composition
  • Magnesium oxide particles, method for producing same, heat dissipating filler, resin composition, heat dissipating grease, and heat dissipating coating composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] (Example 1) Magnesium Oxide Granules-a

[0092] 1 kg of magnesium hydroxide (product name MGZ-0) manufactured by Sakai Chemical Industry Co., Ltd. was added to 1 L of ion-exchanged water in which 50 g of Dispex-A40 (polyacrylic acid ammonium salt manufactured by Allied Colloid Company), 1.64 g Sodium tetraborate decahydrate (manufactured by Wako Pure Chemical Industries, Ltd.) was used to prepare a dispersion slurry of magnesium hydroxide. The quantity of sodium tetraborate decahydrate added at this time was 0.1 mol part in conversion of boron. This slurry was spray-dried to obtain magnesium hydroxide in which sodium tetraborate and decahydrate were uniformly mixed. This magnesium hydroxide was put into an alumina saggar with a lid, and fired at 1100° C. in the air for 10 hours. Magnesium oxide particles-a are obtained by desalting and pulverizing the fired magnesium oxide. The primary particle diameter obtained from the SEM photo of the magnesium oxide particles-a i...

Embodiment 2

[0093] (Example 2) Magnesium Oxide Granules-b

[0094] Except having adjusted the quantity of sodium tetraborate decahydrate to 8.20 g, it carried out similarly to Example 1, and obtained the magnesium oxide particle-b. The amount of sodium tetraborate decahydrate added at this time was 0.5 mol parts in terms of boron. The primary particle size obtained from the SEM photo of the magnesium oxide particles-b is 2.06 μm; the median diameter obtained from the particle size distribution is 3.91 μm; the specific surface area calculated from the specific surface area is 1.98 μm; the obtained from the particle size distribution The value of the median diameter / the specific surface area diameter calculated from the specific surface area was 1.97. In addition, D90 was 6.22 μm, D10 was 2.35 μm, and the value of D90 / D10 was 2.65.

Embodiment 3

[0095] (Example 3) Magnesium Oxide Granules-c

[0096] Magnesium oxide particles-c were obtained in the same manner as in Example 1 except that 5.57 g of lithium tetraborate pentahydrate was used instead of sodium tetraborate decahydrate. The amount of lithium tetraborate pentahydrate added at this time was 0.5 mol parts in terms of boron. The primary particle size obtained from the SEM photo of the magnesium oxide particles-c is 2.11 μm; the median diameter obtained from the particle size distribution is 4.28 μm; the specific surface area calculated from the specific surface area is 2.02 μm; the obtained from the particle size distribution The value of the median diameter / the specific surface area diameter calculated from the specific surface area was 2.03. In addition, D90 was 6.75 μm, D10 was 2.56 μm, and the value of D90 / D10 was 2.64.

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Abstract

The present disclosure provides a magnesium oxide particle that can be used more suitably than common magnesium oxide in the application such as an exoergic filler and the like. A magnesium oxide particle having (median size) / (specific surface diameter obtained from specific surface area) ratio of 3 or less and D90 / D10 of 4 or less is provided.

Description

technical field [0001] The present invention relates to magnesium oxide particles, its production method, exoergic filler, resin composition, exoergic grease and exoergic coating composition. Background technique [0002] Magnesium oxide is a compound excellent in heat resistance, thermal conductivity, and electrical insulation, and is widely used in rubber vulcanization accelerators, pigments for paints and inks, pharmaceuticals, and various industrial fields. As one of various uses of such magnesium oxide, a heat-dissipating filler has been proposed (Patent Document 1, etc.). [0003] As such a heat-dissipating filler, alumina, aluminum nitride, and the like are widely used. However, alumina has a disadvantage in that it has a high Mohs hardness, and therefore wears a kneader severely during the production process of heat sinks and the like. In addition, aluminum nitride has a disadvantage that it is poor in filling properties, so it is difficult to fill it in a resin at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/08C08K3/22C08L101/00C09D7/12C09D201/00C09D7/61
CPCC09D7/1216C01P2006/32C08K3/22C08K9/02C01P2004/52C01P2004/62C01F5/02C01P2004/61C01F5/08C09D7/61C08K2003/2224
Inventor 中川健一铃木雅博
Owner SAKAI CHEM IND CO LTD