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Preparation method of aluminum hydroxide for artificial marble

A technology for artificial marble and aluminum hydroxide, which is applied in the field of preparation of aluminum hydroxide for artificial marble, can solve the problems of low whiteness of plates, unstable raw material indicators of aluminum hydroxide, fluctuation of color difference, etc., and achieves high whiteness and a preparation method. Simple and reasonable, chromaticity stable effect

Active Publication Date: 2008-05-21
中铝山东新材料有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the variety of aluminum hydroxide products, the physical properties are also different, and the index of aluminum hydroxide raw materials is unstable, resulting in low whiteness and fluctuations in color difference. 25-30mg / 100ml castor oil, can only make some middle and low-end products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Raw material preparation: add milk of lime with a weight concentration of 20% to the sodium aluminate solution with an alumina concentration of 120g / L, purify and filter through deep desiliconization, control the b value to 1.4, and cool it down to 56 ℃, the decomposition time is controlled at 50 hours, and the coarse powder with D50 of aluminum hydroxide at 75um is obtained; part of the coarse powder is used as coarse particles after drying, and part is sent to a mechanical mill to make fine particles with D50 at 12μm.

[0011] The above two kinds of coarse and fine granular materials are mixed uniformly by a horizontal ribbon mixer according to the particle size ratio of 6:1 and the weight ratio of 1.5:1 to obtain high whiteness, b value of 0.4, and oil absorption value of 17mg / 100ml. Aluminum hydroxide filler for artificial marble made of sesame oil.

Embodiment 2

[0013] Raw material preparation: add lime milk to the sodium aluminate solution with an alumina concentration of 120g / L for deep desiliconization and purification, control the b value to 1.45, cool down to 58°C through a plate heat exchanger, and control the decomposition time to 55 hours. The coarse powder with D50 of aluminum hydroxide at 80 μm is obtained; part of the coarse powder is used as coarse particles after drying, and part is sent to mechanical milling to make fine particles with D50 at 13 μm.

[0014] Mix the above two kinds of coarse and fine granular materials according to the particle size ratio of 7:1 and the weight ratio of 3:1, and mix them evenly through a horizontal ribbon mixer to obtain high whiteness, b value of 0.35, and oil absorption value of 16.5mg / 100ml Castor oil aluminum hydroxide filler for artificial marble.

Embodiment 3

[0016] In the preparation method of aluminum hydroxide for artificial marble of the present invention, milk of lime is added to the sodium aluminate solution, and after conventional desiliconization and purification, the sodium aluminate solution with a b value of 1.35 is obtained through leaf filter separation, and controlled αk is 1.47, and the temperature is controlled at 60°C. Decompose the sodium aluminate solution to obtain coarse aluminum hydroxide particles with a D50 of 100 μm; grind the coarse aluminum hydroxide to obtain fine aluminum hydroxide particles with a D50 of 15 μm; separate the coarse and fine particles according to their particle size The ratio of 6.5:1 and the weight ratio of 1.8:1 are evenly mixed to obtain the aluminum hydroxide used as artificial marble filler in the present invention.

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Abstract

The invention relates to a preparation method of aluminum hydroxide applied to artificial marble, which is used for preparing the aluminum hydroxide as a special filler of the artificial marble. Sodium aluminate solution is dissolved by seed precipitation to obtain coarse particle materials of the aluminum hydroxide with D50 of 60-110 Mum; the coarse aluminum hydroxide materials are then grinded to obtain materials of fine particle materials of the aluminum hydroxide with D50 of 10-15 Mum; the coarse and fine particle materials of the aluminum hydroxide are evenly mixed according to the granularity ratio of 6-7 to 1 and the weight ratio of 1.5-3.5 to 1 so as to obtain the aluminum hydroxide as the special filler of the artificial marble. The aluminum hydroxide product with D50 of 18-28 Mum which is used as the filler of the artificial marble and obtained by the preparation method which is convenient and reasonable and is easy to be carried out has low oil absorption rate of 15-18mg / 100ml castor oil, high whiteness and color stability, thus ensuring good jade texture and high-grade quality of the artificial marble. The filling volume of the aluminum hydroxide of the artificial marble production can increase 6-8 percent through the usage of users, thus achieving the purposes of effectively improving the performance of inflaming retarding of the artificial marble and reducing the cost.

Description

technical field [0001] The invention relates to a method for preparing aluminum hydroxide for artificial marble, which is used for preparing aluminum hydroxide as a special filler for artificial marble. Background technique [0002] At present, the filler aluminum hydroxide used in the artificial marble industry is mainly purchased by the manufacturer directly from the manufacturer and mixed with coarse and fine aluminum hydroxide fillers. Due to the variety of aluminum hydroxide products, the physical properties are also different, and the index of aluminum hydroxide raw materials is unstable, resulting in low whiteness and fluctuations in color difference. 25-30mg / 100ml castor oil, can only make some low-end products. At present, the aluminum hydroxide filler used in high-end artificial marble products is basically purchased by foreign companies from domestic crude raw materials, processed and sold back to China, and foreign products occupy the domestic high-end market. ...

Claims

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Application Information

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IPC IPC(8): C01F7/14C04B14/36
Inventor 朱德学冯晓明刘国艳孟祥庆马晓宁
Owner 中铝山东新材料有限公司
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