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Method for prepring and modifying high heat-resistant aluminium hydroxide

A technology of aluminum hydroxide and high heat resistance, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems that the initial decomposition temperature is difficult to further increase, and the scope of application is difficult to further expand, so as to simplify the surface modification process and improve heat resistance properties, and the effect of improving heat resistance

Inactive Publication Date: 2007-02-21
HUIZHOU UNIV
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AI Technical Summary

Problems solved by technology

But its initial decomposition temperature is difficult to further increase, and the scope of application is difficult to further expand
The information provided by other literature shows that the current research on the surface modification of aluminum hydroxide in China mainly focuses on improving its compatibility with polymer materials, and rarely involves how to increase its thermal decomposition temperature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First prepare the composite modifier: take the rare earth coupling agent REC (manufactured by the Guangzhou Institute of Chemistry, Chinese Academy of Sciences) and the phosphoric acid ester compound ethylphosphonic acid diethyl ester according to the weight ratio of 5:1, and then mix it physically. have to;

[0023] By weight percentage, get aluminum hydroxide 30%, ionized water 66.0%, composite modifier 4.0%,

[0024] Then put conventional aluminum hydroxide (700-1350 mesh) in a reactor with a stirring device, add deionized water, heat to a temperature of 60°C at a stirring speed of 1000 rpm (rpm), and then add a compound modification modified aluminum hydroxide, reacted for 20 minutes, filtered, dried at 100°C for 3 hours, and ground to obtain modified aluminum hydroxide. Its properties are shown in Table 1 below.

[0025] modifier

Embodiment 2

[0027] First prepare the composite modifier: take the rare earth coupling agent REC (manufactured by the Guangzhou Institute of Chemistry, Chinese Academy of Sciences) and the phosphoric acid ester compound ethylphosphonic acid diethyl ester according to the weight ratio of 5:1, and then mix it physically. have to;

[0028]Then by weight percentage, get aluminum hydroxide 25.5%, ionized water 73.0%, composite modifier 1.5%,

[0029] Then put conventional aluminum hydroxide (700-1350 mesh) in the container, add deionized water, heat to a temperature of 60°C at a stirring speed of 1000 rpm (rpm), and then add a composite modifier for modification. After reacting for 20 minutes, filter, dry at 110° C. for 3 hours, and grind to obtain modified aluminum hydroxide. Its performance after measurement is shown in Table 2 below.

[0030] modifier

Embodiment 3

[0032] Adopt dry process, get aluminum hydroxide 96%, rare earth coupling agent REC4% according to weight percentage,

[0033] Then put the aluminum hydroxide in a high-speed kneader, add rare earth coupling agent REC for high-speed (spindle speed 460-920 rpm) kneading modification, modification temperature 75 ° C, high-speed kneading for 10 minutes and then discharge. The performance of the aluminum hydroxide after the determination is shown in the following table 1.

[0034] modifier

Initial decomposition temperature (°C)

Activation index

Oil absorption value(g / g)

Rare earth coupling agent REC

260

78％

0.27

[0035] From the test results listed in the above tables 1, 2, and 3, it can be seen that the present invention has reached the requirements proposed by the object of the invention, and the modified aluminum hydroxide has good heat resistance and surface activity.

[0036] For the convenience of those skilled in the ar...

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PUM

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Abstract

This invention relates to a method for preparing and modifying Al (OH) 3 flame retardant. The method adopts rare earth coupler as the modifier, or rare earth coupler and phosphate compounds as the composite modifier, and utilizes wet or dry technique to prepare and modify Al (OH) 3 flame retardant. The method can largely improve heat resistance of Al (OH) 3 as well as raise its initial decomposing temperature, and the obtained Al (OH) 3 flame retardant can be widely used in rubber and plastic industiries. The method utilizes one-time surface modification instead of multi-step organic / inorganic modification, thus simplifying the modification process. Besides, the method also raises the activity index of the obtained Al (OH) 3 flame retardant, and reduces its oil-aborbency.

Description

technical field [0001] The invention relates to a preparation and modification technology of a flame retardant, in particular to a preparation and modification method of aluminum hydroxide with high initial decomposition temperature and high thermal stability. Background technique [0002] In recent years, with the wide application of polymer materials in industry, civil and various fields, the safety problems caused by their flammability have attracted the attention of the whole society. Many countries, including China, require the use of flame retardant materials in the form of laws, especially in electronics, electrical, instrumentation, aerospace, transportation, construction, mining and other industries, materials with appropriate flame retardant levels have been widely used . In the United States, Europe, Japan and other developed countries, the amount of flame retardants has maintained an annual growth rate of more than 3.5%. As flame retardants are developing in th...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 周卫平
Owner HUIZHOU UNIV
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