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Weather-resistant pearlescent pigment, and preparation method and application thereof

A pearlescent pigment, weather resistance technology, used in inorganic pigment processing, chemical instruments and methods, fibrous fillers, etc.

Inactive Publication Date: 2016-02-03
FUJIAN KUNCAI MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the second step research of the method, it is also limited to the hydrolytic bonding of silane coupling agent or the chemical bonding of low molecular weight linear polymers, for example: CN101389713B, EP1203795, EP0888410B1, CN103459516A, etc.
However, there is no report on the surface modification of pearlescent pigments in the second step by atom transfer free polymerization.

Method used

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  • Weather-resistant pearlescent pigment, and preparation method and application thereof
  • Weather-resistant pearlescent pigment, and preparation method and application thereof
  • Weather-resistant pearlescent pigment, and preparation method and application thereof

Examples

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Effect test

preparation example Construction

[0097] Another method for preparing weather-resistant pearlescent pigments of the present invention adopts the following technical solutions:

[0098] A preparation method of weather-resistant pearlescent pigment, the method is divided into three steps. One, deposit cerium, aluminum oxide or hydroxide on the surface of the pearlescent pigment, specifically as follows: add 100-150 parts by weight of pearlescent pigment successively in a reactor with a mechanical stirring device, remove 1000--1200 parts by weight Ionized water, then stirred and heated to 75-85°C, lowered the pH value to 4.2 with dilute hydrochloric acid, then added 25-40 parts by weight of 3.5% cerium salt solution, and at the same time added dropwise 30% sodium hydroxide solution to maintain The pH value does not change. After the dropwise addition, raise the pH value to 5.2, continue to drop 25-40 parts by weight of 3.5% aluminum salt solution, and simultaneously add dropwise 30% sodium hydroxide solution to ...

Embodiment 1

[0108] The first step: coating the inorganic layer on the surface of natural mica pearlescent pigments: add 120g of natural mica silver white pearlescent pigments (particle size 10-60μm, KC100A, Fujian Kuncai Material Technology Co., Ltd. company), 1100ml of deionized water, stirred thereupon and heated to 80°C, the pH value was reduced to 4.2 with dilute hydrochloric acid, then 30ml of 3.5% cerium chloride solution was added, and 30% of sodium hydroxide solution was added dropwise Keep the pH constant. After the dropwise addition, the pH value was raised to 5.2, and 30 ml of 3.5% aluminum chloride salt solution was added dropwise, while 30% sodium hydroxide solution was added dropwise to keep the pH value constant. After the dropwise addition, continue to stir for half an hour, filter, wash, and dry at 125° C. to obtain the first modified pearlescent pigment.

[0109] The second step: Coating the organic layer on the basis of the first modified pearlescent pigment prepared i...

Embodiment 2

[0115] The process conditions are the same as in Example 1, except that the natural mica pearlescent pigment is replaced with a synthetic mica pearlescent pigment.

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Abstract

The invention relates to a weather-resistant pearlescent pigment, and a preparation method thereof. The method comprises: firstly, depositing a liquid phase on the surface of a pearlescent pigment to form an inorganic coating layer through hydrolyzing a metal salt (such as aluminum salt, cerium salt); then, further performing grafting on the surface of the obtained pearlescent material by adopting a silane coupling agent containing an amino functional group and bromo-acylhalide (such as bromo-carboxylic acid) to prepare the pearlescent pigment containing an initiating group for atom transfer radical polymerization; and finally, forming a three-dimensional organic coating layer on the surface of the pearlescent pigment by initiating an unsaturated monomer containing an epoxy group. According to the method, a requirement of weather resistance for the pearlescent pigment is met, and powder comprising a polymer with the proper molecular weight is obtained by effectively adjusting the degree of polymerization of the monomer. The pearlescent pigment has excellent dispersibility and stability in application to paint, and the modified powder can reach an effect of act according to actual circumstances during application to paint.

Description

technical field [0001] The invention relates to a method for preparing weather-resistant (or called weather-resistant grade) pearlescent pigments. Specifically, the surface-coating polymer modification of the pearlescent pigments is carried out by atom transfer radical polymerization (ATRP). Background technique [0002] Pearlescent pigments are widely used in coatings, plastics, ceramics, paper, leather, glass, cosmetics and other fields due to their unique optical effects and properties. With the progress of society and the expansion of application fields, requirements are put forward for the performance of pearlescent. Especially in the field of coating applications (automotive paint, building exterior paint, etc.), the color and performance of pearlescent pigments will change under the conditions of ultraviolet rays, water, and oxygen, and even cause accelerated degradation of the organic matrix (such as top coating Pearlescent pigment of titanium dioxide). Therefore, ...

Claims

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Application Information

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IPC IPC(8): C09C1/40C09C1/28C09C3/06C09C3/12C09C3/08C09C3/10C09D7/12
Inventor 谢秉昆曹志成费明陈继威
Owner FUJIAN KUNCAI MATERIAL TECH
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