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Heat ray-shielding material

A heat ray shielding, metal particle technology, applied in thin material processing, optics, instruments, etc., can solve the problems of increasing visible light transmittance, low radio wave transmittance, low visible light transmittance, etc.

Active Publication Date: 2011-05-11
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For example, Ag metal films are often used as heat ray reflective materials due to their high reflectivity, then, it not only reflects visible light and heat rays but also radio waves, so the problem with such films is their visible light transmittance Low and low radio wave transmittance
However, there is a problem with low-E glass that its radio wave transmission is low because a thin film of Ag metal is formed on the surface of the glass
However, in this proposal, since granular Ag is formed by annealing, there are problems in that it is difficult to control the size and shape of the particles, and the area ratio, it is difficult to control the reflection wavelength and reflection band of heat rays, and it is difficult to increase the visible light Transmittance
However, each of these proposals is intended to be used in a plasma display panel, and uses small-volume particles to improve light absorption in the infrared wavelength range, and does not adopt Ag flat-shaped particles as a shield for shielding heat rays. Material (material that reflects heat rays)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] -Synthesis of metal flat particles-

[0124] A 150 mM hydrazine aqueous solution (0.75 mL) was continuously added to the solution containing the following components, and stirred at 1,000 rpm at 25° C. for 2 hours to obtain a cloudy blue particle dispersion.

[0125] ●Ion-exchanged water………762g

[0126] Silver nitrate (manufactured by Wako Junyaku Co., Ltd.) ... 12.7 mg

[0127] Sodium citrate trihydrate (manufactured by Wako Junyaku Co., Ltd.) 100.6 mg

[0128] EDTA4 sodium acetate (manufactured by Wako Junyaku Co., Ltd.) ... 5.0 mg

[0129] It was confirmed that hexagonal flat particles made of silver (hereinafter, referred to as "hexagonal flat particles") having an average particle diameter (average circle-equivalent diameter) of 40 nm were formed in the particle dispersion. In addition, the thickness of the hexagonal flat particles was measured by an atomic force microscope (NANOCUTE II, manufactured by SEIKO INSTRUMENTS INC.). As a result, it was found that th...

Embodiment 2 to 24 and comparative example 4

[0171] Metal flat particles of Examples 2 to 24 and Comparative Example 4 were prepared in the same manner as in Example 1, except that the conditions for producing flat metal particles were changed to those shown in Tables 1-A and 1-B And the heat ray shielding materials of Examples 2 to 24 and Comparative Example 4.

[0172] Notice, Figure 5A Shown is an SEM image of the heat ray shielding material obtained in Example 23, and the image was observed at a magnification of 10,000 times; Figure 5B Shown is an SEM image of the heat ray shielding material obtained in Example 23, and the image was observed at a magnification of 50,000 times.

Embodiment 25

[0174] Except after synthesizing the Ag flat particles as shown in Table 1-B, when preparing the substrate for the heat ray reflective material, the Ag flat particle dispersion was distributed on the surface of the substrate by dropping, and then heated in an oven at 100°C Drying was performed for 30 minutes, but a heat ray shielding material was prepared in the same manner as in Example 5, except that the substrate was dipped in the Ag flat particle dispersion.

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Abstract

The present invention provides a heat ray-shielding material which includes metal particle-containing layer containing at least one kind of metal particle, wherein the metal particle contains substantially hexagonal or substantially discoidal metallic flat particles in an amount of 60% by number or more, and the main planes of the metallic flat particles are oriented at an angle ranging from 0 DEG to + / -30 DEG relative to one surface of the metal particle-containing layer.

Description

technical field [0001] The present invention relates to a heat ray-shielding material having wide reflection wavelength selectivity and a wide reflection band and having excellent visible light transmittance and radio wave transmittance. Background technique [0002] In recent years, heat ray shielding materials for windows of buildings and automobiles have been developed as one of energy saving measures for reducing carbon dioxide emissions. Considering heat ray shielding properties (solar radiant heat gain rate), heat ray reflective materials that do not generate heat and reradiate are more desirable than heat absorbing materials that reradiate absorbed light into the room (so about 1 / 3 of the absorbed solar radiation energy), and various techniques have been proposed. [0003] For example, Ag metal films are often used as heat ray reflective materials due to their high reflectivity, then, it reflects not only visible light and heat rays but also radio waves, so the probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/06
CPCC03C17/007C03C17/008C03C17/42C03C2217/465C03C2217/479G02B5/208Y10T428/256
Inventor 松并由木清都尚治白田真也谷武晴纳谷昌之镰田晃
Owner FUJIFILM CORP
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