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Novel process for preparing pearlescent pigment

A pearlescent pigment and process technology, applied in the direction of inorganic pigment treatment, fibrous filler, chemical instruments and methods, etc., can solve the problems of high equipment requirements, high price of titanium tetrachloride, and easy volatility

Inactive Publication Date: 2016-05-25
孙典学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high purity of titanium tetrachloride in this method, the whiteness and gloss of the product are obviously improved, but because the aqueous solution contains a large amount of hydrochloric acid, it is easy to volatilize, has high requirements for equipment, and the environment is harsh; and the price of titanium tetrachloride is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) Prepare 25% titanium sulfate, titanyl sulfate aqueous solution

[0011] According to the material-acid ratio of titanium dioxide, TiOI[2]:HI[2]SOI[4]=1:2, add titanium dioxide to the acid hydrolysis tank, add concentrated sulfuric acid, add water to adjust the concentration of sulfuric acid to 90%, stir and heat . After the reactants are dissolved and become solid, let stand and cool for 2 hours, then add water to dilute to 25% under air stirring for later use;

[0012] (2) Hydrolysis coating

[0013] Suspend 75 grams of mica powder with a particle size range of 10-60 microns in 400 milliliters of deionized water, stir evenly, and slowly heat to 75 degrees Celsius, and adjust the pH to 2.2 with 20% hydrochloric acid. Then within 4 hours, 110 grams of 25% titanium solution prepared in step 1 was metered in, and at the same time, 25% sodium hydroxide solution was metered in to maintain the pH value of the suspension. After the addition is complete, the solid in the...

Embodiment 2

[0015] (1) Prepare 25% titanium sulfate, titanyl sulfate aqueous solution

[0016] Add the hydrated titanium dioxide dried at 100-200°C to the acid hydrolysis tank according to the material-acid ratio, TiO丨[2]:H丨[2]SO丨[4]=1:2, and then add the dried hydrated titanium dioxide to the acid hydrolysis tank Concentrated sulfuric acid, add water to adjust the concentration of sulfuric acid to 90%, stir and heat. After the reactant dissolves to a solid state, let it cool for 2 hours and then add water to dilute to 25% under air stirring

[0017] (2) Hydrolysis coating

[0018] Suspend 75 grams of mica powder with a particle size range of 10-60 microns in 400 milliliters of deionized water, stir evenly, and slowly heat to 75 degrees Celsius, and adjust the pH to 2.2 with 20% hydrochloric acid. Then within 4 hours, 110 grams of 25% titanium solution prepared in step 1 was metered in, and at the same time, 25% sodium hydroxide solution was metered in to maintain the pH value of the su...

Embodiment 3

[0020] (1) Prepare 25% titanium sulfate, titanyl sulfate aqueous solution

[0021] Hydrate titanium dioxide containing 60% water according to the material-acid ratio, TiO丨[2]:H丨[2]SO丨[4]=1:2, add hydrated titanium dioxide containing 60% water into the acid hydrolysis tank, add concentrated sulfuric acid, and then Add water to adjust the concentration of sulfuric acid to 90%, stir and heat. After the reactants are dissolved and become solid, let stand and cool for 2 hours, then add water to dilute to 25% under air stirring for later use;

[0022] (2) Hydrolysis coating

[0023] Suspend 75 grams of mica powder with a particle size range of 10-60 microns in 400 milliliters of deionized water, stir evenly, and slowly heat to 75 degrees Celsius, and adjust the pH to 2.2 with 20% hydrochloric acid. Then within 4 hours, 110 grams of 25% titanium solution prepared in step 1 was metered in, and at the same time, 25% sodium hydroxide solution was metered in to maintain the pH value of...

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Abstract

The invention relates to a novel process for preparing a pearlescent pigment. The novel process is characterized in that titanium sulfate and / or titanyl sulfate prepared by acidolysis of titanium dioxide and / or titanium dioxide hydrate with sulfuric acid is used as a raw material to replace titanium tetrachloride or titanium liquid prepared from ilmenite powder; a hydrolysis precipitation method (wherein alkaline substances like caustic soda and ammonia water are added at the same time to maintain a pH value) is employed for coating titanium oxide on a lamellar substrate; and process conditions are adjusted so as to control the thickness of titanium oxide on the substrate and the color of the pearlescent pigment. If needed, other metal or nonmetal hydration oxide can be coated in addition. The invention has the following advantages: titanium liquid prepared by using the process has lower cost, identical purity and environment friendliness compared with an aqueous titanium tetrachloride solution, and has higher purity compared with titanium liquid prepared from ilmenite; and with the process, the titanium liquid prepared by using the process can be used for replacing the aqueous titanium tetrachloride solution in conventional production of pearlescent pigments of various models needing the aqueous titanium tetrachloride solution.

Description

technical field [0001] The invention relates to a new process for preparing pearlescent pigments. Specifically, high-purity titanium sulfate and titanium oxysulfate prepared from sulfuric acid acid hydrolysis of titanium dioxide and / or hydrated titanium dioxide are used as raw materials to replace expensive and highly toxic titanium tetrachloride or non-toxic titanium tetrachloride. The pure titanium solution prepared from ilmenite powder is used for various types of pigments containing pearlescent pigments that require titanium tetrachloride aqueous solution in production, instead of titanium tetrachloride aqueous solution. Background technique [0002] Pearlescent pigments are based on natural / artificial mica powder or glass powder with low refractive index, flaky alumina, silicon oxide and other flake materials as the base layer, and the outer layer is coated with metal oxides with high refractive index. The most common It is titanium dioxide. Different pearlescent effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00C09C1/40C09C3/06
Inventor 不公告发明人
Owner 孙典学
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