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Aluminum hydroxide micropowder used as resin filler and method for producing the same

A technology of aluminum hydroxide and filling resin, which is applied in the preparation of alumina/aluminum hydroxide, alkali metal aluminate/alumina/aluminum hydroxide, chemical instruments and methods, etc., can solve the problem of poor workability and inability to mix Problems such as aluminum hydroxide powder, viscosity increase of resin composition, etc.

Inactive Publication Date: 2012-01-11
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such aluminum hydroxide powder having a small average particle diameter is filled in a resin and mixed, the viscosity of the resulting resin composition increases and thus workability may be deteriorated
Therefore, depending on the resin, it is not possible to mix a sufficient amount of aluminum hydroxide powder, so it is sometimes impossible to impart flame retardancy to the resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] will contain Na 2 O concentration is 142 g / L and Al 2 o 3 Sodium aluminate aqueous solution with a concentration of 143 g / L and Al 2 o 3 Aqueous solution of aluminum sulfate with a concentration of 8 wt% was mixed to obtain a neutralized gel with a BET specific surface area of ​​38 m 2 / g, and the peak intensity ratio I(001) / I(002) of the crystal plane (002) of gibbsite to the crystal plane (001) of bayerite is 0.7. Add the neutralizing gel to the Na 2 O concentration of 142 g / L and supersaturated Al 2 o 3 Sodium aluminate aqueous solution with a concentration of 64 g / L, so that the amount of Al contained in the neutralized gel becomes 1.0 wt% based on the amount of Al in the solution, and then by stirring at a given temperature for 89 hours, the ultrafine hydrogen Alumina is grown to give an aqueous slurry of sodium aluminate containing seeded aluminum hydroxide.

[0106] The BET specific surface area of ​​the obtained seed aluminum hydroxide is 3.6 m 2 / g, D5...

Embodiment 2

[0111] The neutralization gel obtained in the same manner as in Example 1 was added with Na 2 O concentration of 139 g / L and supersaturated Al 2 o 3 Sodium aluminate aqueous solution with a concentration of 65 g / L, so that the amount of Al contained in the neutralized gel becomes 1 wt% based on the amount of aluminum in the solution, and then by stirring at a given temperature for 96 hours, the ultrafine hydrogen Alumina is grown to obtain an aqueous sodium aluminate slurry containing seeded aluminum hydroxide.

[0112] The BET specific surface area of ​​the obtained seed aluminum hydroxide is 3.7 m 2 / g, D50 is 1.7 μm, D10 is 0.76 μm, D90 is 3.1 μm (D90 / D10 is 4.1), Na 2 The O concentration was 0.09 wt%, and the peak intensity ratio I(110) / I(002) was 0.50. The sodium aluminate aqueous slurry containing seeded aluminum hydroxide contains supersaturated Al 2 o 3 The concentration was 7.9 g / L, and the solid content was 111 g / L.

[0113] In 10 parts by volume of this slurr...

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Abstract

Provided is an aluminum hydroxide powder used as a resin filler having excellent resin filling properties. Also provided is a method for producing the same. The aluminum hydroxide powder used as a resin filler has a gibbsite crystal structure; the average grain diameter in the grain diameter distribution as determined by laser scattering is between 2.0 and 4.0 [mu]m; the ratio D90 / D10 of secondary grain diameter D10, which is the diameter of 10% of the cumulative mass from the microparticle portion, and the secondary grain diameter D90, which is the diameter of 90% of the cumulative mass from the microparticle portion, is between 4.0 and 6.0; D2 and D1 satisfy formula (1) 2xD1 = D2 = 4xD1 (1) when there are two or more frequency maximums within a grain diameter range I that is between 0.5 and 5.0 [mu]m, with D2 being the maximum grain diameter of the frequency maximum having the largest maximum grain diameter of the frequency maximums within the grain diameter range I and D1 being the maximum grain diameter of the frequency maximum showing the smallest maximum grain diameter; the intensity ratio I (110) / I (002) of the peak at crystal faces (110) and (002) as determined by powder X-ray diffraction is between 0.30 and 0.45; and the total sodium content is 0.10 wt% or less in terms of Na2O.

Description

technical field [0001] The present invention relates to fine aluminum hydroxide powder for filling resin and its manufacturing method. Background technique [0002] With the recent miniaturization of electronic equipment, not only further miniaturization but also safety are required for components such as electronic components of electronic equipment. From the viewpoint of safety, high flame retardancy is required for components. International Publication No. WO 2008-090614 discloses the use of aluminum hydroxide powder as a flame retardant, which is mixed into printed circuit boards, electronic components (such as prepregs) constituting the printed circuit boards, wire coating materials, insulating Among various resin materials used in materials, etc., the resin material has flame retardancy. In practice, aluminum hydroxide powder with an average particle size not greater than 5 μm is used. However, when such aluminum hydroxide powder having a small average particle diam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14C08J5/24C08K3/20C08K9/04C08L101/00C01F7/141
CPCC01P2004/51C01P2002/74C01P2004/62C01F7/141C01P2006/12H05K2201/0266C01P2006/19H05K2201/0209C09C1/407H05K1/0373C01P2004/61Y10T428/2982C01F7/02C01F7/14H05K1/0306C01P2004/60
Inventor 川村祐介
Owner SUMITOMO CHEM CO LTD
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