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Production method of macrocrystalline hexagonal boron nitride

A technology of hexagonal boron nitride and production method, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of decreased product yield, high cost, decreased product purity, etc., to ensure mixing uniformity, production Low cost and the effect of reducing side reactions

Inactive Publication Date: 2010-11-24
丹东市化工研究所有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Among the above-mentioned known methods, method one is the most commonly used method, and method two and method three are also commonly used methods for industrial production of hexagonal boron nitride, but the obtained hexagonal boron nitride has low purity and poor crystallinity. Applications in many fields are limited
These several methods are solid-phase mixing, in the mixing process, there are often component deviations, so that the yield of the product is reduced, thereby increasing the raw material cost of hexagonal boron nitride; and due to the high temperature reaction process, the mixture The composition is not uniform, which reduces the purity of the product, and requires subsequent washing, high-temperature refining and other processes, which also seriously affects the cost and quality of the product
[0016] Hexagonal boron nitride is produced by pyrolysis, although its product performance is excellent, but the cost of this method is relatively high

Method used

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  • Production method of macrocrystalline hexagonal boron nitride
  • Production method of macrocrystalline hexagonal boron nitride

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In the enamel kettle, add 600 kg of water, add 50 kg of boric acid, then add 48 kg of melamine in batches within 1 hour, react at 95°C for 2 hours, then drop to room temperature, filter, and dry;

[0036] Put the product obtained above into a crucible, put it into a high-temperature furnace, raise the temperature to 1600°C within 5 hours, and keep it warm for 3 hours;

[0037] The product obtained above was reacted with 4% hydrochloric acid at 95° C. for two hours, filtered and dried to obtain a large crystal hexagonal boron nitride powder product.

Embodiment 2

[0039] In the enamel reaction kettle, add 500 kg of the filtrate in Example 1, add 100 kg of water, add 50 kg of boric acid and 2 kg of barium carbonate, then add 48 kg of melamine in batches within 1 hour, and react at 95 ° C for 2 hours , then lowered to room temperature, filtered, and dried;

[0040] Put the product obtained above into a crucible, put it into a high-temperature furnace, raise the temperature to 1600°C within 5 hours, and keep it warm for 3 hours;

[0041] The product obtained above was reacted with 4% hydrochloric acid at 95° C. for two hours, filtered and dried to obtain a large crystal hexagonal boron nitride powder product.

Embodiment 3

[0043] In the enamel kettle, add 600 liters of water, add 50 kg of boric acid, then add 51 kg of melamine in batches within 1 hour, react at 95 ° C for 2 hours, then drop to room temperature, filter, and dry;

[0044] Put the product obtained above into a ceramic plate, put it into a tunnel kiln furnace at 1400°C, and bake it for 11 hours;

[0045] The product obtained above was reacted with 4% hydrochloric acid at 95° C. for two hours, filtered and dried to obtain a large crystal hexagonal boron nitride powder product.

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Abstract

The invention relates to a production method of macrocrystalline hexagonal boron nitride, comprising the following steps of: reacting boric acid with melamine by using water as a medium, wherein the mole ratio of the melamine and the boric acid is 1:1.8-2.3; then filtering, drying, then placing a product into a crucible, and placing the crucible into a high temperature furnace to be heated to 800-2000 DEG C; preserving heat for 2-12 hours; carrying out acid cleaning on the obtained product by using dilute acid; and then filtering and drying to obtain a macrocrystalline hexagonal boron nitride product. The invention has simple and convenient process and low production cost, ensures the mixing uniformity of materials in a liquid-phase mixing material way and reduces the side reaction by fast carrying out high-temperature decomposition reaction; and in addition, the obtained product has crystalline granularity larger than 20 micrometers and high purity.

Description

technical field [0001] The invention relates to a production method of large crystal hexagonal boron nitride. Background technique [0002] Large crystalline hexagonal boron nitride usually refers to hexagonal boron nitride with a crystal grain size greater than 5 microns and complete crystal form. It has the advantages of good thermal conductivity and lubricating performance, and has important applications in many fields, such as as a mold release agent with excellent mold release performance, as a high temperature resistant solid lubricant, it can provide Good lubricating properties; it can also be used as a filler in thermally conductive plastic products, providing thermal conductivity second only to metals, and these excellent properties are not possessed by small crystals or low crystallization hexagonal boron nitride. [0003] At present, the synthesis methods of hexagonal boron nitride mainly include the following types: [0004] 1. After mixing anhydrous borax with...

Claims

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Application Information

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IPC IPC(8): C01B21/064
Inventor 倪坤宋明志金英花周晓东
Owner 丹东市化工研究所有限责任公司
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