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Preparation method of silica-coated cerium sulphide red pigment and prepared product thereof

A technology of silica and red pigments, which is applied in the field of inorganic pigments, can solve the problems of little improvement in high-temperature oxidation resistance, unfavorable development of high-temperature ceramic pigments, and insufficient thickness of the coating layer, so as to improve high-temperature oxidation resistance and excellent High-temperature anti-oxidation performance, the effect of ensuring color development ability

Active Publication Date: 2015-09-02
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the existing technology has made some progress in the use of silica to coat cerium sulfide red pigments, there are problems such as insufficient coating thickness and incomplete coating, and the structure is easily destroyed. In addition, the initial oxidation of cerium sulfide The temperature is lower than the crystallization temperature of silicon dioxide, so that its high-temperature oxidation resistance after coating is not much improved, especially in the oxidizing atmosphere at 450 ° C and above, the cerium sulfide pigment has no color rendering ability, making its The application field is still greatly restricted, which is not conducive to the development of high-temperature ceramic pigment technology and application

Method used

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  • Preparation method of silica-coated cerium sulphide red pigment and prepared product thereof
  • Preparation method of silica-coated cerium sulphide red pigment and prepared product thereof
  • Preparation method of silica-coated cerium sulphide red pigment and prepared product thereof

Examples

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Effect test

Embodiment 1

[0028] The preparation method of a kind of silica coating type cerium sulfide red pigment of present embodiment, its steps are as follows:

[0029] (1) Preparation of raw material solution

[0030] Toner suspension: grind and sieve 3g of cerium sulfide pigment, add 190ml of ethanol and 50ml of deionized water to the mixed solution for one dispersion, and add 0.3g of dispersant cetyltrimethylammonium bromide (CTAB) Aging for 24h under slow magnetic stirring at 200r / min, and centrifuging once to remove excess dispersant and impurities to obtain pretreated colorant; then add pretreated colorant to a mixed solution of 100ml ethanol and 20ml deionized water for two Secondary dispersion, after magnetic stirring and ultrasonic dispersion, adjust the pH value of the solution to 10.5 with ammonia water to obtain a colorant suspension;

[0031] Silicon source solution: Dissolve 3.3g tetraethyl orthosilicate in 20ml ethanol solution to obtain silicon source solution;

[0032] (2) Use a...

Embodiment 2

[0036] The preparation method of a kind of silica coating type cerium sulfide red pigment of present embodiment, its steps are as follows:

[0037] (1) Preparation of raw material solution

[0038] Toner suspension: After grinding and sieving 1.67g of cerium sulfide pigment, add 150ml of ethanol and 50ml of deionized water to the mixed solution for one dispersion, and add 0.14g of dispersant cetyltrimethylammonium bromide (CTAB ) aging for 24h under slow magnetic stirring at 200r / min, centrifuged once to remove excess dispersant and impurities to obtain the pretreatment colorant; then add the pretreatment colorant to the mixed solution of 100ml ethanol and 20ml deionized water for Secondary dispersion, after magnetic stirring and ultrasonic dispersion, adjust the pH value of the solution to 9.5 with ammonia water to obtain a colorant suspension;

[0039] Silicon source solution: Dissolve 4g of tetraethyl orthosilicate in 20ml of ethanol solution to obtain a silicon source sol...

Embodiment 3

[0043] The preparation method of a kind of silica coating type cerium sulfide red pigment of present embodiment, its steps are as follows:

[0044] (1) Preparation of raw material solution

[0045] Toner suspension: grind and sieve 3g of cerium sulfide pigment, add 170ml of ethanol and 50ml of deionized water to the mixed solution for one dispersion, and add 0.15g of dispersant cetyltrimethylammonium bromide (CTAB) Aging for 24 hours under slow magnetic stirring at 200r / min, and centrifuging once to remove excess dispersant and impurities to obtain pretreated colorant; then add pretreated colorant to a mixed solution of 90ml ethanol and 20ml deionized water for two Secondary dispersion, after magnetic stirring and ultrasonic dispersion, adjust the pH value of the solution to 10.0 with ammonia water to obtain a colorant suspension;

[0046] Silicon source solution: Dissolve 5g of tetraethyl orthosilicate in 30ml of ethanol solution to obtain a silicon source solution;

[0047...

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Abstract

The invention discloses a preparation method of a silica-coated cerium sulphide red pigment. The preparation method comprises the following steps of firstly, preparing pigment suspension liquid and silicon source solution; secondly, adding the silicon source solution into the pigment suspension liquid at the speed of 0.02-0.15ml / min according to the mole ratio of Si4+:Ce2S3=1-3:1-2, stirring to react, and obtaining precursor powder after cleaning and drying a reaction product; thirdly, calcining the precursor powder under the non-oxidizing atmosphere, and obtaining the compact encapsulated silica-coated cerium sulphide red pigment. The invention also discloses a product prepared by the preparation method. The preparation method is high in encapsulating efficiency and complete in encapsulating, the obtained product is thick and compact in the encapsulated layer, the high-temperature oxidation resistance of the cerium sulphide pigment is greatly improved, the cerium sulphide pigment can be in red under the oxidizing atmosphere with the temperature above 450 DEG C, and the application field is greatly expanded; in addition, the preparation process is simple to operate and easy to popularize and use, and the product is wide in application range and beneficial to the development of high-temperature ceramic pigment technology and application.

Description

technical field [0001] The invention relates to the technical field of inorganic pigments, in particular to a method for preparing a silica-coated cerium sulfide red pigment and a product thereof. Background technique [0002] Inorganic pigments are widely used in industries such as ceramics, coatings and plastics. Red pigment plays an important role in the production and application of decorative materials because of its bright, bright, warm, noble, gorgeous and other characteristics. The red pigments used in industrial production are divided into organic red and inorganic red. Organic red has bright luster and strong tinting power; however, its hiding power, thermal stability, light stability and ability to resist ultraviolet radiation are poor, so it is difficult to completely replace inorganic red. However, most of the currently used inorganic reds contain heavy metal elements such as cadmium, lead, and mercury, which are extremely harmful to the human body. Since ceri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00C09C3/06C09C3/08
Inventor 李月明刘顺国王竹梅沈宗洋谢志翔廖润华
Owner JINGDEZHEN CERAMIC INSTITUTE
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