Near infrared-reflective black pigment and method for producing same

Patent metadata

Field	Value
Publication number	US-2020071187-A1
Application number	US-201816490126-A
Country	US
Kind code	A1
Filing date	Mar 7, 2018
Priority date	Mar 14, 2017
Publication date	Mar 5, 2020
Grant date	—

Abstract

Provided is a method for producing a near infrared-reflective black pigment containing at least the element calcium, the element titanium, and the element manganese, wherein the method produces a pigment that exhibits little of the elution of the element calcium and the element manganese that is caused by contact with acid. At least a calcium compound, a titanium compound, and a manganese compound are mixed by a wet grinding method and are calcined to provide a BET specific surface area of at least 1.0 m2/g and less than 3.0 m2/g. In another method, the element bismuth and/or the element aluminum is incorporated in a near infrared-reflective black pigment containing at least the element calcium, the element titanium, and the element manganese.

First claim

1 . A near-infrared reflective black pigment comprising at least a calcium element, a titanium element, a manganese element, and a bismuth element and having a perovskite phase as a main phase.

2 . The near-infrared reflective black pigment according to claim 1 , wherein an atomic ratio ([Bi]/([Ti]+[Mn])) is 0.02 or less when the atomic ratio is expressed as the ratio of an atomic content of the bismuth element ([Bi]) to a sum of an atomic content of the titanium element ([Ti]) and an atomic content of the manganese element ([Mn]).

3 . The near-infrared reflective black pigment according to claim 1 , comprising at least the calcium element, the titanium element, the manganese element, the bismuth element, and an aluminum element and having the perovskite phase as the main phase.

4 . The near-infrared reflective black pigment according to claim 3 , wherein an atomic ratio ([Al]/([Ti]+[Mn])) is 0.1 or less when the atomic ratio is expressed as the ratio of an atomic content of the aluminum element ([Al]) to a sum of an atomic content of the titanium element ([Ti]) and an atomic content of the manganese element ([Mn]).

5 . The near-infrared reflective black pigment according to claim 1 , having a BET specific surface area of 1.0 m 2 /g or more and less than 3.0 m 2 /g.

6 . A method for producing a near-infrared reflective black pigment, comprising mixing at least a calcium compound, a titanium compound, and a manganese compound by a wet milling method, followed by calcining the mixture at a temperature higher than 1100° C.,
wherein the near-infrared reflective black pigment has a perovskite phase as a main phase and a BET specific surface area of 1.0 m 2 /g or more and less than 3.0 m 2 /g.

7 . The method for producing a near-infrared reflective black pigment according to claim 6 , including mixing at least the calcium compound, the titanium compound, the manganese compound, and an aluminum compound by the wet milling method, followed by calcining the mixture.

8 . The method for producing a near-infrared reflective black pigment according to claim 6 , comprising mixing at least the calcium compound, the titanium compound, the manganese compound, and a bismuth compound by the wet milling method, followed by calcining the mixture.

9 . The method for producing a near-infrared reflective black pigment according to claim 6 , comprising mixing at least the calcium compound, the titanium compound, the manganese compound, an aluminum compound, and a bismuth compound by a wet milling method, followed by calcining the mixture.

10 . The method for producing a near-infrared reflective black pigment according to claim 7 , wherein an atomic ratio ([Al]/([Ti]+[Mn])) is 0.1 or less when the atomic ratio is expressed as the ratio of an atomic content of the aluminum element ([Al]) to a sum of an atomic content of the titanium element ([Ti]) and an atomic content of the manganese element ([Mn]) in the near-infrared reflective black pigment.

11 . The method for producing a near-infrared reflective black pigment according to claim 8 , wherein an atomic ratio ([Bi]/([Ti]+[Mn])) is 0.02 or less when the atomic ratio is expressed as the ratio of an atomic content of the bismuth element ([Bi]) to a sum of an atomic content of the titanium element ([Ti]) and an atomic content of the manganese element ([Mn]) in the near-infrared reflective black pigment.

12 . The near-infrared reflective black pigment according to claim 2 , comprising at least the calcium element, the titanium element, the manganese element, the bismuth element, and an aluminum element and having the perovskite phase as the main phase.

13 . The near-infrared reflective black pigment according to claim 12 , wherein an atomic ratio ([Al]/([Ti]+[Mn])) is 0.1 or less when the atomic ratio is expressed as the ratio of an atomic content of the aluminum element ([Al]) to a sum of an atomic content of the titanium element ([Ti]) and an atomic content of the manganese element ([Mn]).

14 . The near-infrared reflective black pigment according to claim 2 , having a BET specific surface area of 1.0 m 2 /g or more and less than 3.0 m 2 /g.

15 . The near-infrared reflective black pigment according to claim 12 , having a BET specific surface area of 1.0 m 2 /g or more and less than 3.0 m 2 /g.

16 . The near-infrared reflective black pigment according to claim 13 , having a BET specific surface area of 1.0 m 2 /g or more and less than 3.0 m 2 /g.

17 . The method for producing a near-infrared reflective black pigment according to claim 9 , wherein an atomic ratio ([Al]/([Ti]+[Mn])) is 0.1 or less when the atomic ratio is expressed as the ratio of an atomic content of the aluminum element ([Al]) to a sum of an atomic content of the titanium element ([Ti]) and an atomic content of the manganese element ([Mn]) in the near-infrared reflective black pigment.

18 . The method for producing a near-infrared reflective black pigment according to claim 9 , wherein an atomic ratio ([Bi]/([Ti]+[Mn])) is 0.02 or less when the atomic ratio is expressed as the ratio of an atomic content of the bismuth element ([Bi]) to a sum of an atomic content of the titanium element ([Ti]) and an atomic content of the manganese element ([Mn]) in the near-infrared reflective black pigment.

Assignees

• Ishihara Sangyo Kaisha

Inventors

• Fujimura Takeshi
• Sanefuji Norihiko
• Kataoka Kenji

Classifications

• C01P2006/12

  Surface area · CPC title

• C09D7/62

  modified by treatment with other compounds · CPC title

• C01P2006/80

  Compositional purity · CPC title

• C01P2006/62

  L* (lightness axis) · CPC title

• C01P2002/70

  defined by measured X-ray, neutron or electron diffraction data · CPC title