A green pigment with low lightness and high near-infrared reflectivity and preparation method thereof

A green pigment and near-infrared technology, applied in the field of composite inorganic pigments, can solve problems such as difficulty in maintaining the green tone of chrome green pigments

Active Publication Date: 2021-04-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these research results have failed to improve the reflectivity of the near-infrared band while maintaining the green tone of the chrome green pigment. For example, studies have shown that single-doping aluminum ions or titanium ions can make the reflectance of chrome green in the near-infrared band reach 80. % or more, but at the same time, the reflectivity and lightness value of chrome green in visible light will be greatly improved, and it is difficult to maintain the green tone of chrome green pigment

Method used

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  • A green pigment with low lightness and high near-infrared reflectivity and preparation method thereof
  • A green pigment with low lightness and high near-infrared reflectivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh the following raw materials according to mass percentage: chromium trioxide, 29.14g; manganese dioxide, 0.86g; then press the ball: material: ethanol=4:1:1 weigh zirconium ball, 120g; ethanol, 30g, add the ball mill together , using ethanol as the ball milling medium, using planetary wet ball milling to mix evenly, drying and grinding, passing through a 100-mesh sieve to remove large particles, and then placing it in a horse boiling furnace for solid-phase reaction. Gradually rise from room temperature to 1200°C, keep warm and cool to room temperature with the furnace. Finally, the powder is ground and sieved to obtain the green pigment S1.

Embodiment 2

[0020] Weigh the following raw materials according to mass percentage: chromium trioxide, 28.29g; manganese dioxide, 1.71g; then press the ball: material: ethanol=4:1:1 weigh zirconium ball, 120g; ethanol, 30g, add the ball mill together , using ethanol as the ball milling medium, using planetary wet ball milling to mix evenly, drying and grinding, passing through a 100-mesh sieve to remove large particles, and then placing it in a horse boiling furnace for solid-phase reaction. Gradually rise from room temperature to 1200°C, keep warm and cool to room temperature with the furnace. Finally, the powder is ground and sieved to obtain the green pigment S2.

Embodiment 3

[0022] Weigh the following raw materials according to mass percentage: chromium trioxide, 26.61g; manganese dioxide, 3.38g; then press the ball: material: ethanol=4:1:1 weigh zirconium ball, 120g; ethanol, 30g, add the ball mill together , using ethanol as the ball milling medium, using planetary wet ball milling to mix evenly, drying and grinding, passing through a 100-mesh sieve to remove large particles, and then placing it in a horse boiling furnace for solid-phase reaction. Gradually rise from room temperature to 1200°C, keep warm and cool to room temperature with the furnace. Finally, the powder is ground and sieved to obtain the green pigment S3.

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Abstract

The invention belongs to the technical field of composite inorganic pigments, and in particular relates to a green pigment with both low lightness and high near-infrared reflectivity and a preparation method thereof. In the present invention, chromium trioxide is used as the base material, doped with manganese dioxide and prepared by a solid-phase method; manganese dioxide and chromium oxide undergo a solid solution reaction at high temperature to form a spinel-structured manganese chromate secondary phase, and finally obtain The green pigment takes into account both low lightness and high near-infrared reflectivity. The pigment is green in the visible light band, and the lightness value is 24-33; In reflective coatings, and in the field of military camouflage materials. The research and application of dark energy-saving coatings have broad prospects. The solid-phase synthesis method has mature and simple preparation technology, less investment, easy operation, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of composite inorganic pigments, in particular to a green pigment with low lightness and high near-infrared reflectivity and a preparation method thereof. Background technique [0002] In the hot summer, buildings, cars, oil tanks, etc. are exposed to the sun for a long time, and their external and internal temperatures are too high, which seriously affects the comfort of people's living conditions and the safety of industrial facilities. Constructing a heat insulation system that can effectively reduce the heat load of the air conditioning system and the external surface temperature of industrial facilities is an important way for energy-saving and cooling design. White or light colors are widely used in energy-saving buildings and storage tanks because of their natural good reflection of sunlight. However, due to their poor stain resistance and color requirements, dark paints are often required Good heat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/00C04B35/12C04B35/626C09D5/33C09D5/30C09D7/61
CPCC01P2006/62C01P2006/63C01P2006/64C04B35/12C04B35/6261C04B2235/3243C04B2235/3267C04B2235/9661C09C1/0081C09D5/004C09D5/30C09D7/61Y02P20/10
Inventor 陆海鹏王真雄温开怀张珊朱亚光翁小龙邓龙江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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