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Preparation method of ultrafine active heavy calcium carbonate

A heavy calcium carbonate, active technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of high investment, reduce equipment investment, improve the added value of products, and simplify the process.

Inactive Publication Date: 2012-02-15
HUNAN LEIXIN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is convenient, simple, and has a high output, which is suitable for large-scale industrial production. It is necessary to add a modified production line on the basis of the original grinding process, and the investment is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example （ 1

[0019] Example (1), filler for rubber.

[0020] 1. Slurry preparation, each content in parts by mass:

[0021] Disperse 70 parts of heavy calcium carbonate, powder, 325 mesh, in 30 parts of water, add 1.5 parts of dispersant, and stir evenly; then add 1.2 parts of surface modifier; keep the pH value between 7-11, and stir evenly , mixing time 50min.

[0022] 2. Grinding modification:

[0023] Put the mixed slurry into the first mill, and grind and modify it through the mill. The flow rate of the slurry is 30g / min, and the grinding time is 60min. Monitor the temperature of the slurry in the mill, so that the grinding time above 80°C exceeds 30min; then enter the storage tank of the second grinding machine, continue to stir in the storage tank for 30 minutes and then enter the second grinding machine, the flow rate of the slurry is 30g / min, and the grinding time is 60min. It is also necessary to monitor the slurry in the grinding machine temperature above 80°C for more than 4...

example （ 2

[0029] Example (2), used as a filler for artificial leather.

[0030] 1. Slurry preparation, each content in parts by mass:

[0031] Disperse 70 parts of heavy calcium carbonate, powder, 325 mesh, in 30 parts of water, add 1.5 parts of dispersant, and stir evenly; then add 2.0 parts of surface modifier; keep the pH value between 7-11, and stir evenly , mixing time 30min.

[0032] 2. Grinding modification:

[0033] Put the mixed slurry into the first mill, and grind and modify it through the mill. The flow rate of the slurry is 30g / min, and the grinding time is 60min. Monitor the temperature of the slurry in the mill, so that the grinding time above 80°C exceeds 30min; then enter the storage tank of the second grinding machine, continue to stir in the storage tank for 30 minutes and then enter the second grinding machine, the flow rate of the slurry is 40g / min, and the grinding time is 60min. It is also necessary to monitor the slurry in the grinding machine temperature abov...

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Abstract

A preparation method of ultrafine active heavy calcium carbonate comprises steps of: 1. slurry preparation by dispersing 65-75 parts of powder heavy calcium carbonate with 300-350 mesh in 25-35 parts of water, adding 0.05-3 parts of dispersant and 0.05-3 parts of surface modifier and mixing well; 2. grinding modification by employing a wet grinding method with two stage series milling modification to produce grade D40-D98 heavy calcium modification slurry according to modification heavy calcium powder technology standard; 3. drying to form powder; 4. grading and collection to obtain ultrafine active calcium carbonate product with different particle sizes of 400-600 mesh. Compared with a dry method modification, the method of the invention realizes the modification technology with grinding, so as to further simplify the technology, reduce equipment investment and lower enterprise investment cost. The method has significant meaning for raising product added value and reducing production cost.

Description

technical field [0001] The invention relates to the technical field of powder surface modification. That is, a preparation method of superfine active ground calcium carbonate. Background technique [0002] Activated calcium carbonate, white fine, light powder, also known as modified calcium carbonate, surface treated calcium carbonate, specific gravity 1.99 ~ 2.01. It is prepared by modifying the surface of heavy calcium carbonate with a surface modifier. Since the calcium carbonate modified by the surface modifier generally has a reinforcing effect, it is called "active". It is customary to call the modified calcium carbonate active calcium carbonate. A layer of fatty acid soap is adsorbed on the surface of activated calcium carbonate, so it has colloidal activation and reinforcement. Easily decomposed in the rubber. Used as a rubber filler, it can make the rubber bright in color, high in elongation, high in tensile strength and good in wear resistance. Activated calc...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 李刚杨雷周俊蒋冬华王文忠
Owner HUNAN LEIXIN NEW MATERIAL TECH
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