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A kind of preparation method of high heat stable aluminum hydroxide micropowder

A technology of aluminum hydroxide and micropowder, which is applied in the field of inorganic non-metallic new materials, environmentally friendly flame retardants, can solve the problems of failing to meet environmental protection requirements, increase production costs, and low dehydration temperature, achieve regular crystal forms, and improve high temperature resistance Performance, the effect of high dehydration temperature

Active Publication Date: 2016-08-17
ZIBO PENGFENG ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the traditional aluminum hydroxide powder is added as a filler in the epoxy resin material, the temperature of dehydration of the aluminum hydroxide powder is low, which will cause the copper clad laminate to encounter high temperature (about 280 ℃) in the process of soldering electronic components, which will cause explosion. plate
The use of other flame retardants instead will increase production costs or fail to meet environmental protection requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Firstly, in the process of preparing aluminum hydroxide micropowder by seed separation method, after adding seeds into the sodium aluminate solution, decompose at a low temperature and constant temperature for 3.2 hours at a temperature of 42°C to make the decomposition rate reach 32%, and then sodium aluminate The solution is heated and decomposed at a heating rate of 8°C / h. When the temperature rises to 75°C, it enters into high-temperature constant-temperature decomposition. After the decomposition is completed, the constant temperature is continued for 2.5 hours to perfect the crystallization. During the whole decomposition process, stirring is carried out at 65r / min; the sodium aluminate After the solution is decomposed, the aluminum hydroxide micropowder and the decomposed mother liquor are subjected to liquid-solid separation;

[0019] 2) Put the obtained aluminum hydroxide micropowder filter cake into the washing tank, add washing water to form an aluminum h...

Embodiment 2

[0024] 1) Firstly, in the process of preparing aluminum hydroxide micropowder by the seed separation method, after adding seeds to the sodium aluminate solution, decompose at a low temperature and constant temperature for 3.8 hours at a temperature of 43°C to make the decomposition rate reach 35%, and then sodium aluminate The solution is heated and decomposed at a heating rate of 9°C / h. When the temperature rises to 77°C, it enters into high-temperature constant-temperature decomposition. After the decomposition is completed, the constant temperature is continued for 2.6h to perfect the crystallization, and 60r / min is stirred during the whole decomposition process; the sodium aluminate After the solution is decomposed, the aluminum hydroxide micropowder and the decomposed mother liquor are subjected to liquid-solid separation;

[0025] 2) Put the obtained aluminum hydroxide micropowder filter cake into the washing tank, add washing water to form an aluminum hydroxide slurry ...

Embodiment 3

[0030] 1) Firstly, in the process of preparing aluminum hydroxide micropowder by seed separation method, after adding seeds into the sodium aluminate solution, decompose at a low temperature and constant temperature for 4 hours at a temperature of 40°C to make the decomposition rate reach 30%, and then the sodium aluminate solution Decompose at a heating rate of 8°C / h. When the temperature rises to 79°C, it enters into high-temperature constant-temperature decomposition. After the decomposition is completed, continue to maintain a constant temperature for 2 hours to perfect the crystallization. During the entire decomposition process, stir at 70r / min; decompose the sodium aluminate solution After the aluminum hydroxide of gained and decomposition mother liquor carry out liquid-solid separation;

[0031]2) Put the obtained aluminum hydroxide micropowder filter cake into the washing tank, add washing water to form an aluminum hydroxide micropowder slurry for washing, and the so...

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Abstract

The invention discloses a preparation method of aluminum hydroxide micro powder with high thermal stability, and belongs to the technical field of inorganic non-metal novel materials. The preparation method is characterized in that the aluminum hydroxide micro powder is prepared through crystal seed decomposition, and comprises the following steps: adding a crystal seed into a sodium aluminate solution for 3-4 hours' constant temperature decomposition at 40-45 DEG C and heating decomposition at a heating rate of 8-10 DEG C / hour in sequence, carrying out constant temperature decomposition again when the temperature is increased to 75-80 DEG C, and keeping the constant temperature for 2-3 hours to perfect crystallization after the secondary constant temperature decomposition is finished, wherein stirring at 60-70 r / min needs to be performed in the whole decomposition process; conducting liquid-solid separation on decomposed slurry to obtain aluminum hydroxide; conducting washing, drying and classification on aluminum hydroxide to obtain the aluminum hydroxide micro powder. The preparation method has the advantages that the aluminum hydroxide micro powder obtained through the temperature variation process is smoother in crystal surface and higher in dehydration temperature; when the aluminum hydroxide micro powder is added into an epoxy resin system material, the production requirements for substrate prepregs required by high-end copper clad laminates are met.

Description

technical field [0001] The invention discloses a method for preparing high-heat-stable aluminum hydroxide micropowder, which belongs to the technical field of inorganic non-metallic new material environment-friendly flame retardants. Background technique [0002] Aluminum hydroxide micropowder is a green and environment-friendly flame retardant with a large amount. It is often added to plastics as a flame retardant filler material, but aluminum hydroxide fine powder is not only a strong polar inorganic material, but also has poor compatibility with non-polar polyolefin polymers when used, and aluminum hydroxide fine powder The thermal decomposition temperature of aluminum oxide is low, and when the external temperature reaches about 250 ° C, it will lose water and decompose into alumina. Because of the poor high temperature resistance of aluminum hydroxide micropowder, it cannot be applied to some high temperature fields. [0003] Copper-clad laminate is a commonly used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
Inventor 陈杰石保利梁颜玲虞湛郭春芳李红霞石飞罗杨王娇
Owner ZIBO PENGFENG ALUMINUM IND
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