Infrared reflecting black pigment, coating material and resin composition

A black pigment, infrared technology, applied in the field of coatings and resin compositions, black pigments for infrared reflection, can solve problems such as sufficient heat insulation effect, and achieve the effect of excellent infrared reflectivity

Inactive Publication Date: 2008-01-30
TODA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the average reflectance of this iron oxide in the visible light region with a wavelength of 250 to 780 nm is less than 10%, and the average reflectance in the infrared region with a wavelength of 780 to 2500 nm is less than 30%, so it cannot be said that the heat insulating effect is sufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Make BaCO 3 , CoO, TiO 2 and Fe 2 o 3 According to the composition formula: BaCo x Ti x Fe 12-2x o 19 (x = 0.9) was measured and mixed, and then baked at 1100° C. for 2 hours in the air. The fired product was pulverized to obtain a black pigment with an average particle diameter of 0.7 μm. The ratio of Fe in the obtained black pigment was 78.5 mol % with respect to all metal elements, and the ratio of Co was 6.9 mol % with respect to all metal elements.

[0088] In addition, the obtained black pigment had an average reflectance of 7% in the visible light region with a wavelength of 250 to 780 nm, and an average reflectance of 40% in the infrared region with a wavelength of 780 to 2500 nm.

Embodiment 2～5、 comparative example 1～5

[0090] A black pigment was obtained in the same manner as in Example 1 except that the raw materials and composition ratio were changed. The production conditions at this time are shown in Table 1, and the characteristics of the obtained black pigment for infrared reflection are shown in Table 2. In addition, the magnetite (magnetite) of the comparative example 5 was MAT-305 by Toda Kogyo Co., Ltd. product.

[0091] "M type" in the crystal structure in Table 2 indicates a magnetoplumbite type, and "spinel" indicates a spinel type. In addition, the so-called Cr 6+ The content of "less than 5ppm" means below the detection limit of the assay device.

[0092] Table 1

[0093] Manufacture of black pigments

composition

Firing temperature °C

Example 1

BaCo 0.9 Ti 0.9 Fe 10.2 o 19

1100

Example 2

co 0.75 Zn 0.75 Fe 2.0 o 4

800

Example 3

co 0.5 Mg 0.5 Fe 2.0 o 4

1000

Example ...

Embodiment 6

[0097] Make CoO, Al 2 o 3 , MgO and Fe 2 o 3 According to the composition formula: CoO x MgO x n[(Fe y al 1-y ) 2 o 3 ] (x=0.5, y=0.5, n=1) were measured and mixed, and then fired at 1100° C. for 2 hours in the air. The fired product was pulverized to obtain a black pigment with an average particle diameter of 0.7 μm. The crystal structure of the obtained black pigment was spinel type. The obtained black pigment had an average reflectance of 7% in the visible light region with a wavelength of 250 to 780 nm, and an average reflectance of 40% in the infrared region with a wavelength of 780 to 2500 nm.

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Abstract

The black pigment for infrared reflection of the present invention is composed of a composite oxide, has an average plate surface diameter of 0.20 to 5.0 μm, a blackness (L* value) of 30 or less, and an average reflectance in the visible light region of a wavelength of 250 to 780 nm. 10% or less, and the average reflectance in the infrared region of wavelength 780-2500nm is more than 35%, the composite oxide is composed of Fe, Co and selected from Al, Mg, Ca, Sr, Ba, Ti, Zn, Sn, At least one metal of Zr, Si and Cu. In addition, the present invention can provide a black pigment for infrared reflection that does not contain harmful elements and can obtain a heat-shielding paint having excellent infrared reflection properties.

Description

technical field [0001] The present invention relates to a black pigment for infrared reflection, a paint and a resin composition, and more specifically, to a black pigment for infrared reflection and a paint containing the same, which does not contain harmful elements and can obtain a heat-shielding paint having excellent infrared reflectivity and resin compositions. Background technique [0002] The internal temperature of roads, buildings, storage tanks, automobiles, ships, etc. used outdoors rises due to the sun’s rays. Therefore, by painting the exterior of buildings, automobiles, etc. in white to light colors, sunlight can be reflected. The heat insulation effect is improved to a certain extent. [0003] However, especially in order to make dirt less conspicuous, the roofs of outdoor buildings, etc. are often dark to black, and the appearance of buildings and cars with dark to black exterior coatings is different from light to white exterior coatings. Compared with au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C08K3/22C08L101/00C09C1/24C09D5/33C09K3/00
CPCC01P2006/63C01P2002/32C09D7/1275C08K3/08C08K3/22C01G51/00C01P2006/64C01G49/08C01P2006/62C01G51/006C09D11/037C09D7/1283B82Y30/00C01P2004/54C09D5/004C01G49/009C01P2004/20C09D7/1216C09D7/1266C01P2004/61C01P2006/12C09C1/22C01P2004/64C01P2004/62C01P2006/80C09D7/61C09D7/67C09D7/68C09D7/69
Inventor 真田和俊
Owner TODA IND
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