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A kind of preparation method of spherical hexagonal boron nitride aggregate

A technology of hexagonal boron nitride and agglomerates, which is applied in the field of preparation of hexagonal boron nitride agglomerates, can solve the problem that the orientation of layered hexagonal boron nitride is difficult to fill in large quantities, and achieves high sphericity, smooth surface and specific surface area. small effect

Active Publication Date: 2018-10-26
上海百图高新材料科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that layered hexagonal boron nitride is easy to produce orientation and difficult to fill in a large amount when dispersed in the system, and provides a method for preparing spherical hexagonal boron nitride aggregates

Method used

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  • A kind of preparation method of spherical hexagonal boron nitride aggregate
  • A kind of preparation method of spherical hexagonal boron nitride aggregate

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specific Embodiment approach 1

[0015] Specific embodiment one: the preparation method of the spherical hexagonal boron nitride aggregate of the present embodiment comprises the following steps:

[0016] 1. According to the weight ratio of oxide and alkaline earth metal carbonate (9-1.5): 1, add oxide and alkaline earth metal carbonate into the ball mill, and obtain alkaline earth metal carbonate-oxide composite sintering aid through ball milling. agent;

[0017] 2. Weigh 59% to 83% of hexagonal boron nitride, 1% to 6% of dispersant, 15% to 30% of binder and 1% to 5% of alkaline earth metal carbonate-oxidized Compound sintering aid, dispersant, binder and composite sintering aid are added to water and mixed uniformly, then hexagonal boron nitride is added and mixed uniformly to obtain water-based slurry; the mass content of solids in the water-based slurry 10% to 60%;

[0018] 3. Carry out spray granulation treatment to the water-based slurry obtained in step 2 by spray drying method, and continuously stir...

specific Embodiment approach 2

[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the alkaline earth metal carbonate described in step 1 is calcium carbonate; the others are the same as Embodiment 1.

specific Embodiment approach 3

[0022] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that the oxide described in step 1 is one or two kinds of oxides of transition elements, the main group III, and the main group IV. The above combinations or composite oxides; others are the same as the specific embodiment 1 or 2.

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Abstract

The invention provides a preparation method of a spherical hexagonal boron nitride aggregate, and relates to the preparation method of the spherical hexagonal boron nitride aggregate. The invention aims at solving the problems that orientation and difficulty in filling of a large amount are easy to generate during dispersion of layered hexagonal boron nitride in a system. The method comprises thefollowing steps: (1) preparation of an alkaline earth metal carbonate-oxide composite sintering aid; (2) hexagonal boron nitride, a dispersant, an adhesive and a sintering aid are used for preparing water base slurry; (3) spraying and granulation are carried out; (4) rubber discharging is carried out; (5) sintering is carried out in order to obtain the spherical hexagonal boron nitride aggregate.The spherical hexagonal boron nitride aggregate has high sphericility, a continuous bridge forming and overlapping mode appears between primary particles for aggregation with isotropy, and the methodhas a simple process and is friendly to environment.

Description

technical field [0001] The invention relates to a preparation method of hexagonal boron nitride aggregates, and belongs to the technical field of inorganic non-metallic heat-conducting insulating fillers. Background technique [0002] Hexagonal boron nitride is the crystal structure with the most stable structure and the softest texture among the various phases of boron nitride. Its structure is similar to graphite and has a hexagonal layered structure. Because hexagonal boron nitride has excellent thermal conductivity, ultra-low dielectric constant and thermal expansion coefficient, good machinability, low friction coefficient and other advantages, it has attracted much attention in the field of thermal conductivity. Hexagonal boron nitride has thermal anisotropy, and its in-plane (001 plane) thermal conductivity is several tens of times higher than that perpendicular to the in-plane direction (002 plane). When hexagonal boron nitride is applied to a heat conduction system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/583C04B35/638C04B35/64
CPCC04B35/583C04B35/638C04B35/64C04B2235/3208C04B2235/3286C04B2235/6562C04B2235/6567C04B2235/661C04B2235/94
Inventor 郭庆周宇郑香丽胡景涛
Owner 上海百图高新材料科技有限公司
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