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Titanium dioxide dispersing agent and process

A technology of dispersant and titanium dioxide, which is applied in the treatment of dyeing low molecular organic compounds, dyeing high molecular organic compounds, dyeing physical treatment, etc., to achieve the effect of improving efficiency

Inactive Publication Date: 2015-04-29
路怡颖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems of low slurry concentration, high wet grinding viscosity and large fineness after wet grinding of titanium dioxide, the present invention provides a titanium dioxide Dispersant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 0.2wt% dispersant to the calcined titanium dioxide, the dispersant is isopropanolamine, disperse evenly in the wet dispersing tank at 25 rpm, the concentration of titanium dioxide is 900g / L, the pH is 9.0, enter the sand Refining with a sand mill with a production capacity of 3t / h to obtain a slurry with a particle size of 0.23μm and a viscosity of 0.8mPa.s, followed by chemical treatment to obtain finished titanium dioxide.

Embodiment 2

[0023] Preparation of dispersant: Add polymer polycarbonate, silicone resin and isopropanolamine to the container in sequence, mix well and then add N-isopropylacrylamide, adding ratio of isopropanolamine, N-isopropylacrylamide , silicone resin, and polymer polycarbonate in a weight ratio of 2:1:3:0.3, and finally add water to reach a concentration of 50wt%, and stir well. The molecular weight of silicone resin is 600-800, and the molecular weight of high molecular polycarbonate is 10000.

[0024] Add 0.2wt% dispersant to the titanium dioxide obtained by calcining, disperse evenly in a wetting and dispersing tank at 25 rpm, the concentration of titanium dioxide is 1000g / L, pH is 9.10, enter the sand mill for grinding, The production capacity is 3t / h, and a slurry with a particle size of 0.22μm and a viscosity of 0.7mPa.s is obtained, and then chemically treated to obtain finished titanium dioxide.

Embodiment 3

[0026] Preparation of dispersant: Add polymer polycarbonate, silicone resin and isopropanolamine to the container in sequence, mix well and then add N-isopropylacrylamide, adding ratio of isopropanolamine, N-isopropylacrylamide , silicone resin, and polymer polycarbonate in a weight ratio of 2:1:3:0.3, and finally add water to reach a concentration of 50.5wt%, and stir well. The molecular weight of silicone resin is 800-1200, and the molecular weight of high molecular polycarbonate is 11000.

[0027] Add 0.2wt% dispersant to the titanium dioxide obtained by calcining, and disperse evenly in the wetting and dispersing tank at 25 rpm. The concentration of titanium dioxide can reach 1600g / L, and the pH is 9.12. The production capacity of the machine is 3t / h, and the slurry with a particle size of 0.21μm and a viscosity of 0.65mPa.s is obtained, and then chemically treated to obtain the finished titanium dioxide.

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Abstract

The invention belongs to the technical field of titanium dioxide treatment after production and relates to a titanium dioxide dispersing agent. The titanium dioxide dispersing agent comprises isopropanolamine, N-isopropyl acrylamide, silicone resin with a molecular weight of 600-800 and polycarbonate with a molecular weight 10,000-11,000. A titanium dioxide dispersing process comprises the following steps of: adding the dispersing agent into titanium dioxide obtained by calcining, dispersing the titanium dioxide uniformly in a wetting and dispersing tank, feeding the dispersed titanium dioxide into a sander, sanding into slurry, and treating the slurry chemically. The highest concentration of the titanium dioxide dispersed by the dispersing agent provided by the invention before being sanded is 1,600g / L, and the highest concentration of the titanium dioxide dispersed by other dispersing agents before being sanded is only 600g / L. By adopting the dispersing agent, the titanium dioxide sanding efficiency can be improved, the pH value of the titanium dioxide slurry can be kept around 9.0, the viscosity of a sanding material can be reduced significantly, the particle size of the titanium dioxide slurry obtained by sanding can be reduced significantly to 0.20-0.23mu m, and the high-quality slurry can be provided for the following chemical treatment step.

Description

[0001] technical field [0002] The invention relates to the technical field of post-production treatment of titanium dioxide, in particular to a titanium dioxide dispersant and a dispersion process. Background technique [0003] Wet grinding of titanium dioxide pigments before chemical treatment is a very important link, because although the particle size of calcined titanium dioxide pigments is pulverized by Raymond mill, there are still a certain number of 1-10 μm coarse particles or aggregated particles that have not been pulverized. Especially when the Raymond mill is used for crushing, due to the rolling effect of the grinding roller, many fine particles that have been crushed are squeezed together to form agglomerated particles, which require a large amount of energy to separate during dispersion. Practice has proved that there are large particles of 0.5 μm or more in titanium dioxide pigments, and its hiding power, tinting strength, underlying color and other pigm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/12C09C3/10C09C3/08C09C3/04C09C1/36
Inventor 路怡颖
Owner 路怡颖
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