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Novel technology for preparing pearlescent pigment

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

Inactive Publication Date: 2012-05-02
江崴
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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] Titanium dioxide according to the material-acid ratio, TiO↓[2]:H↓[2]SO↓[4]=1:2, add titanium dioxide to the acid hydrolysis tank, add concentrated sulfuric acid, add water to adjust the sulfuric acid concentration to 90%, Stir to warm. 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 suspens...

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↓[2]:H↓[2]SO↓[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 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;

[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 maintai...

Embodiment 3

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

[0021] The hydrated titanium dioxide with a water content of 60% is added according to the material-acid ratio, TiO↓[2]:H↓[2]SO↓[4]=1:2, after adding the hydrated titanium dioxide with a water content of 60% into the acidolysis 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 me...

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Abstract

The invention relates to a novel technology for preparing pearlescent pigment. The novel technology for preparing pearlescent pigment is characterized in that raw materials comprising titanium sulfate and / or titanyl sulfate prepared from hydrated titanium dioxide and / or titanium white subjected to sulfuric acid acidolysis replace titanium liquid prepared from titanium tetrachloride or ilmenite powder; a laminar base material hydrolysis deposition process (comprising addition of alkaline substances such as caustic soda and ammonia water for PH maintenance) is adopted; through technical condition adjustment, the thickness of titanium oxide coated on a base material and a product color can be controlled; and according to needs, an additional other metal or nonmetal hydrated oxide can be coated on the base material. Titanium liquid obtained by the novel method has a cost which is lower than a cost of a titanium tetrachloride aqueous solution, purity which is the same as purity of the titanium tetrachloride aqueous solution and is higher than purity of titanium liquid prepared from ilmenite, and environmentally friendly characteristics. The novel method can be utilized for replacement of a titanium tetrachloride aqueous solution used in production of various types of pearlescent pigment-containing pigment products.

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): C09C3/06C09C1/40C09C1/00
Inventor 江崴
Owner 江崴
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