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Method for producing high weathering resistance titanium dioxide pigment

A technology of titanium dioxide and production methods, applied in the direction of fibrous fillers, etc., can solve the problems of restricting the application of titanium dioxide, and achieve the effects of low labor intensity, easy automatic control, 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

Coated titanium dioxide SiO 2 The amount of coating is generally lower than 3.0%, Al 2 o 3 The amount of coating is also lower than 3.5%, which limits the application of titanium dioxide in the field of high weather resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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 7.5, then stir and mature, the temperature is reduced from 76°C to 70°C, and 0.5% sodium aluminate solution (in the form of Al 2 o 3 ) and a concentration of 30% by weight of the sulfuric acid ...

Embodiment 2

[0031] 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 2.0% sodium silicate solution (as SiO 2 meter), then add 2.6% sodium silicate solution (as SiO 2 meter) and a concentration of 10% by weight of sulfuric acid solution, the speed of addition is to maintain the pH value of the slurry between 10.0 and 10.5. After the feeding is finished, use sulfuric acid solution to acidify the slurry at a uniform speed until the pH of the slurry is 7.0, then stir and mature, the temperature is maintained at 60 ° C, and the 2.5% sodium aluminate solution (based on Al 2 o 3 ) and a sulfuric acid solution with a concentration of 20% by weight, added at a r...

Embodiment 3

[0034] Prepare 500g of titanium dioxide primary product into a slurry with distilled water, add sodium carbonate solution to make the pH of the slurry 10.5, add sodium hexametaphosphate 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 3.0% sodium silicate solution (as SiO 2 meter), then add 3.0% sodium silicate solution (as SiO 2meter) and a concentration of 50% by weight of sulfuric acid solution, the rate of addition is to maintain the pH value of the slurry between 10.0 and 10.5. 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 add 5.0% sodium aluminate solution and 40% by weight concentration of the total amount of titanium dioxide. Sulfuric acid solution, Adding ...

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Abstract

The invention supplies a manufacture method for high weathering resistance 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; adding sulphuric acid; adding sodium aluminate solution and sulphuric acid solution; adjusting the pH value; 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 high weather resistance titanium dioxide pigment. 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 photoc...

Claims

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Application Information

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IPC IPC(8): C09C1/36
Inventor 侯盛东伍良英陈新红
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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