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Method for producing high covering power titanium dioxide pigment

A titanium dioxide and production method technology, applied in the direction of fibrous fillers, etc., can solve the problems of poor weather resistance, difficult reaction control, affecting the performance of TiO2, etc., and achieve the effects of good dispersibility, high covering power, and high weather resistance.

Inactive Publication Date: 2006-10-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US Patent 3897261 provides improved TiO 2 The method of pigment hiding power, that is, at a temperature of 60 ° C and a pH of 7, in TiO 2 Silica and alumina are deposited on the particles twice, but because this method does not cover dense silicon, although the covering performance of the product is improved, the weather resistance is poor
U.S. Patent 4075031 also provides an improved TiO 2 The method of pigment hiding power, that is, coating at a high temperature of 90°C, due to the high temperature, the reaction is not easy to control, and the deposits cannot be completely deposited on TiO 2 Particles, affecting TiO 2 performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare 500g of titanium dioxide primary product into slurry with deionized water, add sodium hydroxide solution to make the pH value of the slurry 10.05, add sodium hexametaphosphate solution, sand the slurry in a sand mill, and filter out the sand with a sieve and coarse particles. Add the slurry into the coating tank, raise the temperature to 76°C, and begin to coat the dense silicon. First add the 0.5% sodium silicate solution (as SiO 2 meter), then add 0.5% sodium silicate solution (as SiO 2 meter) and a concentration of 20% by weight of sulfuric acid solution, the speed of addition is to maintain the pH value of the slurry between 10.0 and 11.0. After the feeding is finished, acidify the slurry with sulfuric acid solution at a uniform speed until the pH of the slurry is 7.0, then stir and mature, the temperature is lowered from 76°C to 70°C, and the porous silicon coating starts. Add 5.0% sodium silicate solution (as SiO 2 ) and a sulfuric acid solution with a...

Embodiment 2

[0032] Prepare 500 g of titanium dioxide primary product into slurry with deionized water, add potassium hydroxide solution to make the pH value of the slurry 10.2, add sodium silicate solution, sand the slurry in a sand mill, filter out sand particles and Coarse particles. Add the slurry into the coating tank, raise the temperature to 60°C, and begin to coat the dense silicon. First add the 1.0% sodium silicate solution (as SiO 2 meter), then add 1.0% sodium silicate solution (as SiO 2 meter) and a concentration of 20% by weight of sulfuric acid solution, the speed of addition is to maintain the pH value of the slurry between 10.0 and 11.0. After the feeding is finished, acidify the slurry with sulfuric acid solution at a uniform speed until the pH of the slurry is 7.5, then stir and mature, keep the temperature at 60°C, and begin to coat the slurry with porous silicon. Add 6.0% sodium silicate solution (as SiO 2 ) and a sulfuric acid solution with a concentration of 30% ...

Embodiment 3

[0035] Prepare 500 g of the primary titanium dioxide product into a slurry with distilled water, add sodium carbonate solution to make the pH of the slurry 10.5, add sodium silicate solution, grind the slurry in a sand mill, and filter out sand and coarse particles with a sieve. Add the slurry into the coating tank, raise the temperature to 85°C, and begin to coat the dense silicon. First add the 1.0% sodium silicate solution (as SiO 2 meter), then add 1.5% sodium silicate solution (as SiO 2meter) and a sulfuric acid solution with a concentration of 10% by weight, the speed of adding is to maintain the pH value of the slurry between 10.0 and 11.0. After the feeding is finished, acidify the slurry with sulfuric acid solution at a uniform speed until the pH of the slurry is 8.0, then stir and mature, lower the temperature to 50°C, and begin to coat the slurry with porous silicon. Add 8.0% sodium silicate solution (as SiO 2 ) and a sulfuric acid solution with a concentration o...

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Abstract

The invention supplies a manufacture method for strong covering power titanium dioxide pigment that includes the following steps: making slurry; adjusting the pH value of the slurry; adding dispersing agent and filtering; heating; adding sodium silicate solution; adding mixture of sodium silicate and sulphuric acid solution; adjusting the pH value to 7.0-8.0; filtering, washing, drying, taking gas smashing and organic process. The invention has strong covering power, good dispersibility and high weathering resistance.

Description

technical field [0001] The invention relates to a production method of a pigment, in particular to a production method of a titanium dioxide pigment with high hiding power. Background technique [0002] Titanium dioxide has become the best white pigment because of its high refractive index, strong decolorizing power, good gloss and whiteness, and is widely used in the fields of coatings, plastics, papermaking, inks and chemical fibers. Due to the photocatalytic activity of titanium dioxide, especially rutile titanium dioxide, it will catalyze and degrade the organic components in contact with it during use, causing the coating to lose gloss and pulverize and fall off, seriously reducing the various performance and service life of the product. Therefore, the use of coating technology on TiO 2 Particles are surface treated, i.e. on TiO 2 The surface of the particles is coated with a layer of photochemically inert material as a barrier, thereby reducing the TiO 2 The photoch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36
Inventor 伍良英侯盛东陈新红
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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