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Coating modified material of nano calcium carbonate and modification method thereof

A technology of nano-calcium carbonate and modified materials, which is applied in the treatment of fibrous fillers and dyed high-molecular organic compounds. Dispersion performance, improvement of physical and chemical properties, and the effect of improving dispersibility

Active Publication Date: 2010-03-17
湖南博深实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First, due to the strong hydrophilicity of the surface of the nano-calcium carbonate powder material, the compatibility with the polymer matrix is ​​poor, and the direct application effect is not good.
[0005] The second is that calcium carbonate itself will decompose and release carbon dioxide in a slightly acidic medium, which restricts its scope of use.

Method used

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  • Coating modified material of nano calcium carbonate and modification method thereof
  • Coating modified material of nano calcium carbonate and modification method thereof
  • Coating modified material of nano calcium carbonate and modification method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 25KG nano calcium carbonate in QMJ200 vertical ball mill, then add 50KG deionized water and carry out ball milling for 5 minutes, the carboxylated styrene-butadiene emulsion (wherein the volume ratio of carboxylated styrene-butadiene emulsion and nano-calcium carbonate is respectively 13%, Diluted deionized water (75KG) was added to the ball mill for ball milling for 90 minutes, and the ball mill speed was 45 r / min .

[0036] The slurry after ball milling is filtered through a 800-type filter press. Then put it into a fully automatic pusher kiln for drying.

[0037] The drying temperature is 200°C, and the pushing speed is 5 minutes / cycle. The dried material is dispersed in a 100L vertical internal screw mixer with a mixer frequency of 1400

[0038] The dispersed material is sampled and sent to TEM for deposition volume test.

[0039] see figure 1 , The edges and corners of the powder particles are blunted and close to spherical, not easy to agglomerate, and ha...

Embodiment 2

[0043] Add 25KG nano-calcium carbonate in QMJ200 vertical ball mill, then add carboxypolybutadiene (the volume ratio of carboxypolybutadiene and nano-calcium carbonate is 13%), then add 50L toluene, ball mill 90 minutes, ball mill speed 45 r / min .

[0044] The slurry after ball milling is filtered through an 800-type filter press. Then put it into a fully automatic pusher kiln for drying.

[0045] The drying temperature is 200°C, and the pushing speed is 5 minutes / cycle. The dried material is dispersed in a 100L vertical internal screw mixer with a mixer frequency of 1400

[0046] The dispersed material is sampled and sent to TEM for deposition volume test.

[0047] see figure 2 , the edges and corners of the coated particles are passivated, and the appearance of the particles is gradually approaching spherical. Because carboxypolybutadiene itself is relatively viscous, the adhesion between the coated particles is more serious.

[0048] see Figure 4 , FT-IR spectrum of...

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Abstract

The invention relates to a coating modification method of a carboxylic polymer to nano calcium carbonate. In the invention, a carboxylic butylbenzene polymer or carboxylic polybutadiene are adopted, nano CaCO3 is coated and modified by a direct blending method, pulp after being coated is filtered, a filter cake is dried, and then a product can be obtained. The edges of coated particles are passivated, and the particles approach to a spherical shape, are not allowed to aggregate and have good stability. The surface is changed from a hydrophilic state into an oily state, and the dispersivity ina non-polar solvent is improved. The invention has simple operation and easy industrialized production.

Description

technical field [0001] The invention belongs to the surface modification of powder materials, and relates to the preparation of calcium carbonate, and more specifically relates to the coating and modification preparation of nanometer calcium carbonate. Background technique [0002] As a high-quality filler, nano-calcium carbonate is widely used in rubber, plastics, coatings and other industries. Its main purpose is to improve the comprehensive performance of products and reduce industrial costs. [0003] However, there are also many problems in practical application of nano calcium carbonate: [0004] One is that due to the strong hydrophilicity of the surface of the nano-calcium carbonate powder material, the compatibility with the polymer matrix is ​​poor, and the direct application effect is not good. [0005] The second is that calcium carbonate itself will decompose and release carbon dioxide in a slightly acidic medium, which restricts its scope of use. [0006] For ...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/10C08K9/04
Inventor 田伟达彭铁缆匡建波
Owner 湖南博深实业集团有限公司
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