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Dispersing agent and dispersing process for improving wet-grinding efficiency of titanium white powder

A technology of dispersant and titanium dioxide, which is applied to the dispersant to improve the efficiency of titanium dioxide wet grinding, the dispersion process to improve the efficiency of titanium dioxide wet grinding, and the viscosity of the final slurry is large to achieve the effect of improving efficiency

Active Publication Date: 2012-06-13
JINAN YUXING CHEM
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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 milling viscosity and large fineness after wet milling of titanium dioxide, the present invention provides a method to improve titanium dioxide Dispersant for white powder wet grinding efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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

[0024] 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 2:2:1:0.5, and finally add water to reach a concentration of 50wt%, and stir well. The molecular weight of silicone resin is 800-1200, and the molecular weight of high molecular polycarbonate is 15000-19000.

[0025] 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

[0027] 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 2:2:1:1, 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 15000-19000.

[0028] 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 relates to a dispersing agent for improving the wet-grinding efficiency of titanium white powder and belongs to the technical field of post treatment in the production of titanium white powder. The dispersing agent comprises isopropanolamine, N-isopropylacrylamide, silicone resin with the molecular weight of 800-1200 and high-molecular polycarbonate with the molecular weight of 15000-19000. A dispersing process for improving the wet-grinding efficiency of the titanium white powder comprises the following steps of: adding the dispersing agent into the titanium white powder obtained by calcinations, dispersing uniformly in a wet dispersing tank, feeding into a grinder for grinding, and then carrying out chemical treatment. Before grinding, the highest concentration of the dispersing agent can reach 1600g / L, but for the other used dispersing agent, before grinding, the highest concentration of the dispersing agent only can reach 600g / L, so that the grinding efficiency is improved; and the pH is stable about 9.0, the viscosity of a ground material is obviously reduced, and the particle size of the ground slurry is obviously reduced and can reach 0.20-0.23mum, so that a high-grade material basis is provided for chemical treatment in a next procedure.

Description

[0001] technical field [0002] The invention relates to the technical field of post-production treatment of titanium dioxide, in particular to a dispersant for improving the efficiency of wet grinding of titanium dioxide, and also to a dispersion process for improving the efficiency of wet grinding of titanium dioxide. 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 particl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/38B01F17/16B01F17/22B01F17/52B01F17/54C09C1/36C09C3/04C09K23/38C09K23/16C09K23/22C09K23/52C09K23/54
Inventor 王春霞王吉宏
Owner JINAN YUXING CHEM
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