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Method for modifying attapulgite clay

A modified technology of attapulgite clay, which is applied in the treatment of dyed low-molecular organic compounds, fibrous fillers, dyed organic silicon compounds, etc. It can solve the problems of system thickening and water-based coatings losing performance, and achieve good dispersion. , the effect of inhibiting the polymerization reaction

Inactive Publication Date: 2012-08-08
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the crystal structure of attapulgite contains three-dimensional chains, its needle-like bundles are prone to polymerization after being dispersed in water to form a messy network. The network binds the liquid and thickens the system, making the water-based paint thicker and lose its effectiveness.

Method used

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  • Method for modifying attapulgite clay
  • Method for modifying attapulgite clay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Soak 50g attapulgite powder (fineness of 200-300 mesh) and 5g stearic acid in 100ml ethanol solution, stir continuously for 4 hours, and then stand for 2 hours;

[0018] 2) Add 2ml of Tween 80 nonionic surfactant to the above mixture, stir and heat it in a 60℃ water bath for 3 hours;

[0019] 3) Filter the mixture, filter out the attapulgite powder and wash it with anhydrous ethanol solution 4 times;

[0020] 4) Dry the cleaned attapulgite powder at 80°C for 5 hours to obtain outstanding attapulgite powder.

Embodiment 2

[0022] 1) Soak 100g of attapulgite powder (with a fineness of 300 mesh to 400 mesh) and 15g of stearic acid in 100ml of toluene solution, stir continuously for 4 hours, and then stand for 2 hours;

[0023] 2) Add 4ml of Tween 20 non-ionic surfactant to the above mixture, stir and heat in a water bath at 80°C for 5 hours;

[0024] 3) Filter the mixture, filter out the attapulgite powder and wash it with anhydrous ethanol solution 4 times;

[0025] 4) Dry the cleaned attapulgite powder at 100°C for 2 hours to obtain outstanding attapulgite powder.

Embodiment 3

[0027] 1) Soak 50g of attapulgite powder (with a fineness of 300 to 400 mesh) and 5g of epoxy polysiloxane in 120ml of a mixed solution of xylene and isopropanol (the ratio of xylene and isopropanol is 78.5 vol%: 21.5vol%), keep stirring for 2 hours, and then stand for 3 hours;

[0028] 2) Add 2ml of Tween 80 non-ionic surfactant to the above mixture, stir and heat in a 60℃ water bath for 7 hours;

[0029] 3) Filter the mixture, filter out the attapulgite powder and wash it with anhydrous ethanol solution 4 times;

[0030] 4) Dry the cleaned attapulgite powder at 80°C for 4 hours to obtain outstanding attapulgite powder.

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Abstract

The invention discloses a method for modifying attapulgite clay. The method comprises the following steps: adding an organic water repellent compound in attapulgite clay powder with the fineness of 200 to 400 meshes; adding an organic solvent and stirring for 1-4 hours; then standing for 2-3 hours to obtain slurry; adding a nonionic surfactant in the slurry, heating at the temperature of 60-80 DEG C for 3-7 hours and filtering; and drying the filtered powder to obtain the modified attapulgite clay powder. The modified attapulgite obtained by the method disclosed by the invention is favorable in dispersity in water and is suitable for preparing water-based paint.

Description

technical field [0001] The invention relates to a new method for modifying attapulgite clay in water-based paint. Background technique [0002] Attapulgite clay (hereinafter referred to as attapulgite) is a clay mineral mainly composed of hydrous magnesium-rich silicate (attapulgite) with a layer-chain transition structure. High-viscosity attapulgite has excellent thickening properties, Suspension and shake-thaw properties are widely used in paint and paint industries in developed countries. At present, the coatings mainly use alcohol-based organic solutions as the main solution. Since solvent-based coatings are very harmful to the environment and human health, and various solvents are more expensive than water, all countries in the world attach great importance to the development of water-based coatings, and formulate Relevant regulations strictly limit the content of VOC (volatile organic compounds) in paints, and the proportion of solvent-based paints is getting smalle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/42C09C3/08C09C3/12C09C3/10
Inventor 姚义俊刘斌吴红艳杭烨超
Owner NANJING UNIV OF INFORMATION SCI & TECH
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