Method for preparing metal coated pearlescent pigment

A pearlescent pigment and metal coating technology, applied in the field of pearlescent pigments, can solve the problems of affecting the stability of the coating, the inability of pearlescent pigments to express characteristics, and the difficulty in obtaining uniform hue pearlescent pigments, etc., to improve the photocatalytic activity and antibacterial effects.

Active Publication Date: 2015-05-20
浙江瑞成新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But, natural mica has its defect as the matrix material of pearlescent pigment: (1) though the mica sheet that (1) grinds and grades by wet milling method can obtain less thickness and larger diameter-to-thickness ratio (general requirement is greater than 50), but Usually there is a wide range of thickness distribution (0.2-1 micron), which is easy to affect the stability of the coating, and it is not easy to produce pearlescent pigments with uniform hue; (2) when the mica sheet is coated with metal oxide, due to mica The formed layers and edge gradients cause light scattering and reduce the pearlescent effect; (3) natural mica contains iron ions and other colored impurity ions, which need to be removed by very complicated and time-consuming steps
[0007] In the past, when pearlescent pigments were prepared into coatings to have other functions, other effective agents such as antibacterial agents or antifouling agents were often added to increase the functions of the coatings. However, the more additives were added, the interaction between the additives The greater the factor, the less effective the performance will be. This kind of mixing method will cause the pearlescent pigment to fail to express its characteristics and it is difficult to maintain the color quality of the pearlescent coating.

Method used

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  • Method for preparing metal coated pearlescent pigment
  • Method for preparing metal coated pearlescent pigment
  • Method for preparing metal coated pearlescent pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: present embodiment provides a kind of pearlescent pigment, and its structure is:

[0030] (1) if Figure 1 As shown, on the surface of the sheet substrate 1, a plurality of columnar Ti 2 o 3 accept Rice stick 2, sheet substrate 1 can be natural mica sheet, synthetic mica sheet, glass flake, sheet-shaped aluminum powder, sheet-shaped expanded perlite, aluminum oxide, silicon dioxide, etc., the grain of sheet-shaped substrate 1 The diameter can be 2-800 microns, and the thickness can be 0.1-10 microns. In the present invention, an aqueous solution of titanium trichloride hydrochloric acid is slowly added dropwise to the solution containing the sheet substrate 1, so that titanium trichloride is hydrolyzed into di Ti and adsorbed on the sheet substrate 1 to form a Ti 2 o 3 accept Mi Stick 2 where Ti 2 o 3 accept Mi stick 2 can control Ti according to reaction rate, reaction time and acid-base value (pH value) 2 o 3 accept The height of rice sti...

Embodiment 2

[0031] Embodiment 2: the present embodiment provides a kind of pearlescent pigment coated with metal, and its structure is:

[0032] (1) if Figure II Shown, continue the follow-up step of embodiment 1, further provide another kind of pearlescent pigment. (2) Utilize Ti on the pearlescent pigment of embodiment 1 2 o 3 Reducibility, after redox reaction with metal salt, Ti 2 o 3 oxidized to TiO 2 , metal particles 4 are reduced and deposited on TiO 2 accept 1 on the rice stick 3 and the sheet substrate; wherein, the metal salt can be metal salts such as chloroauric acid, chloroplatinic acid, ruthenium chloride, palladium chloride, rhodium chloride, ferric chloride, copper nitrate and palladium acetate. Any one or a combination of two or more. Next, according to the use of different metal particles 4 deposited on the TiO 2 accept On the rice stick 3 and the sheet-like substrate 1, pearlescent pigments coated with different metals can be obtained. For example, after r...

Embodiment 3

[0033] Embodiment 3: present embodiment provides a kind of pearlescent pigment, and its structure is:

[0034] (1) Carry out Ti on the surface with commercially available pearlescent pigments (YB103, YB205, YB219, YB300, YB504, etc.) 2 o 3 accept The rice sticks grow by reaction, and the Ti is controlled according to the dropping time of the titanium trichloride solution. 2 o 3 accept The growth height of rice sticks, after reacting for 8 to 12 hours, the pH value is controlled at 1.5-2.5, Ti 2 o 3 accept Rice sticks grow to a height of 60-80 accept meters, and has a length of 30-60 accept m, width 30-60 accept m, and the Ti 2 o 3 accept Rice rods, which will form a rough surface on their surface, and have a total roughness Rz between 60-80, and Ti 2 o 3 Coated pearlescent pigments, and the pearlescent pigments form multiple Ti on the surface 2 o 3 accept rice stick accept The rice structure has a lotus effect, which produces anti-fouling and dust-pr...

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Abstract

The invention discloses a method for preparing a metal coated pearlescent pigment. The pearlescent pigment is characterized by comprising a flaky substrate and a plurality of titanium dioxide nanorods which are arranged at intervals and are formed on the flaky substrate, so that a nano-structured surface with roughness can be formed by the titanium dioxide nanorods of the pearlescent pigment, and then, a plurality of metal particles are deposited on each titanium dioxide nanorod and the flaky substrate respectively.

Description

technical field [0001] The invention belongs to the field of pearlescent pigments, and relates to a powder pigment, in particular to a metal-coated pearlescent pigment and a preparation method thereof. Background technique [0002] Pearlescent pigments are pigments that give pearly luster to products. It is a transparent or translucent flake as the core, and uses a special chemical process to coat one or more layers of titanium dioxide and other metal oxides on its surface. When When the light hits the interface of the pearlescent pigment, reflected light and refracted light will be produced, part of the light is transmitted and then reflected, and they interfere with each other to produce a three-dimensional pearlescent color. At present, most of the base materials are mica flakes, which are covered with a high-refraction titanium dioxide coating. When white light shines on this type of pigment, it is partially reflected by the titanium dioxide layer, and the rest of the li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/40C09C3/06A01N59/16A01P1/00C09D5/36C09D5/14A61K8/29A61K8/19A61Q3/02A61Q1/10A61Q1/04A61Q1/08
Inventor 张海滨郭永城李善云黄兆忠徐步方穆彬郭秋容吴兴伟
Owner 浙江瑞成新材料股份有限公司
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