Preparation method of aluminum hydroxide for artificial marble

A technology of 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 aluminum hydroxide raw material index, fluctuation of color difference, etc., achieve high whiteness, and the preparation method Simple and reasonable, stable color effect

Active Publication Date: 2009-11-18
中铝山东新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 method for preparing aluminum hydroxide for artificial marble, which is used for preparing aluminum hydroxide as a special filler for artificial marble, decomposing sodium aluminate solution to obtain coarse aluminum hydroxide particles with a D50 of 60-110 μm material; grind the coarse aluminum hydroxide to obtain fine aluminum hydroxide particles with a D50 of 10-15 μm; mix the coarse and fine particles according to the ratio of particle size 6-7:1 and weight ratio 1.5-3.5:1, The aluminum hydroxide used as artificial marble filler in the present invention is obtained. Simple and reasonable, easy to implement, the obtained aluminum hydroxide product used as artificial marble filler has a D50 of 18-28μm, low oil absorption rate of 15-18mg / 100ml castor oil, high whiteness and stable color, making artificial marble products Jade has strong texture and high-grade texture. Through the use of users, the filling amount of aluminum hydroxide produced by artificial marble can be increased by 6-8%, so as to effectively improve the flame retardancy of artificial marble and reduce 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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Patent Type & Authority Patents(China)
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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