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Preparation method of nano-CaCO3-coated brucite composite material

A composite material and surface coating technology, applied in the field of composite powder material production, can solve the problems such as the inability to eliminate the smooth surface and edges of the particles, and the poor improvement of the mechanical properties of the product.

Inactive Publication Date: 2015-09-09
HULUDAO SHOUCHUANG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic modification of the surface of brucite can not eliminate the smooth surface and edges of the particles, so the effect of improving the mechanical properties of the product is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present embodiment coats nano-CaCO on the surface of brucite The preparation method of the composite material comprises the following steps:

[0027] 1. Place 400kg of brucite powder (200 orders) and 400kg of deionized water in the ultrafine grinding system of the wet stirring mill, stir for 30min by a mixer with a high-speed stirring effect, then add a solution containing 4kg of sodium polyacrylate ( Solution concentration 20%, add this solution 20kg), then stir for 40min to make ultrafine grinding slurry;

[0028] 2. Start the ultra-fine grinding system of the wet stirring mill, and grind the slurry made of brucite powder and water according to the continuous grinding method so that the particle size of the ground product is less than 2 μm and the content is 80%;

[0029] 3. Adding Nano-CaCO 3 200kg of powder and 467kg of deionized water were placed in a stirring tank with high-speed stirring and stirred for 15 minutes, then a solution containing 3kg of sodium po...

Embodiment 2

[0041] The present embodiment coats nano-CaCO on the surface of brucite The preparation method of the composite material comprises the following steps:

[0042] 1. 800kg of brucite powder (1250 mesh) and 800kg of deionized water are placed in the ultra-fine grinding system of the wet stirring mill, stirred for 60min by a mixer with a high-speed stirring effect, and then added a solution containing 8kg of sodium polyacrylate ( Solution concentration 20%, add this solution 40kg), then stir for 80min to make ultrafine grinding slurry;

[0043] 2. Start the ultra-fine grinding system of the wet stirring mill, and grind the slurry made of brucite powder and water according to the continuous grinding method so that the particle size of the ground product reaches 75% of the content of less than 2 μm;

[0044] 3. Adding Nano-CaCO 3 400kg of powder and 940kg of deionized water were placed in a stirring tank with high-speed stirring and stirred for 50 minutes, then added a solution con...

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Abstract

The invention relates to a preparation method of a nano-CaCO3-coated brucite composite material, which firmly and uniformly coats nano CaCO3 on the brucite particle surface by the following steps: carrying out wet-process ultrafine grinding to refine brucite particles used as the core, and carrying out depolymerization dispersion on the nano CaCO3 particles used as the coating until the brucite particles and nano CaCO3 particles are respectively refined to the matched particle size range, wherein the ratio of the brucite diameter (spherical equivalent diameter) to the CaCO3 particle diameter is about (8-10):1. The brucite particles subjected to ultrafine grinding generate the mechanical force surface activation effect, thereby promoting the interface combination between the brucite particles and nano CaCO3; and the brucite particles are subjected to ultrafine grinding and activation to form more structural hydroxy groups on the surface, the nano CaCO3 forms secondary hydroxy groups under the hydration actions of Ca<2+> and CO3<2->, and the reaction between the brucite particles and nano CaCO3 particles is implemented by chemical linkage among the surface hydroxy groups.

Description

technical field [0001] The invention relates to the technical field of composite powder material production, in particular to a preparation method for coating nano-CaCO3 composite material on the surface of brucite. Background technique [0002] Magnesium hydroxide refers to a micron-sized powder material with Mg(OH)2 as the main component, which is prepared by pulverizing and grinding natural ore or chemical reaction. my country is rich in natural magnesium hydroxide (brucite) resources. Deep processing of magnesium hydroxide to improve its performance has positive significance for expanding the application field of magnesium hydroxide, improving the utilization value of mineral resources and protecting the environment. [0003] Brucite contains 69.12% MgO and 30.88% H2O, which is the mineral with the highest magnesium content found in nature so far. According to its own crystal structure characteristics, the particles of brucite usually appear in the form of plate or flak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/02C08K9/00C08K3/22
Inventor 曹志孙德峰
Owner HULUDAO SHOUCHUANG TECH CO LTD
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