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Flat metal particle-containing composition and heat ray-shielding material

A technology of heat ray shielding and flat metal, applied in metal processing equipment, nanotechnology for materials and surface science, transportation and packaging, etc., can solve problems such as unstable light resistance of plasmonic polaritons, and achieve avoidance of decline, The effect of good transmittance and extreme transmittance

Active Publication Date: 2011-11-23
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

JP-B 3594803 neither discloses nor suggests that plasmons of noble metal nanoparticles are photostability unstable because no specific photostability modifier is used in said noble metal colloid

Method used

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  • Flat metal particle-containing composition and heat ray-shielding material
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  • Flat metal particle-containing composition and heat ray-shielding material

Examples

Experimental program
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Effect test

preparation example Construction

[0144] The production method of the heat ray shielding material of the present invention is not particularly limited, and may be appropriately selected depending on the intended purpose. In one available method, a substrate is coated with a dispersion comprising flat metal particles using, for example, a dip coater, slit coater, slit coater, rod coater, or gravure coater. In another embodiment, flat metal particles are plane-oriented by methods such as LB film method, self-organization method and spraying method.

[0145] Furthermore, a method utilizing electrostatic interaction to increase the adsorbability or plane orientation of the flat metal particles on the surface of the substrate can be applied to the plane orientation. Specifically, when the surface of the flat metal particles is negatively charged (for example, when the flat metal particles are dispersed in a medium that can be negatively charged, such as citric acid), the surface of the substrate is positively charg...

Embodiment

[0154] The present invention will be described below by way of examples, which should not be construed as limiting the present invention thereto.

[0155] The silver interaction potential EAg of the heterocyclic compounds used in Examples and Comparative Examples was determined as follows.

[0156]

[0157] The silver interaction potential EAg can be measured by the following silver interaction electromotive force method.

[0158] First, a solution (50 mL) containing a heterocyclic compound at a concentration of 0.00100M, potassium hydrogencarbonate at a concentration of 0.0200M, and potassium carbonate at a concentration of 0.0267M was prepared. The pH of the prepared solution was adjusted to 10.0 with 1M nitric acid or sodium hydroxide. Then, 1 mL of 0.00500 M silver nitrate was added to the resulting solution under magnetic stirring at 20°C-25°C. The potential of the solution at 15 min after silver nitrate addition was determined electrochemically using a calomel electr...

preparation Embodiment 1

[0160] -Synthesis of Flat Silver Particles-

[0161] A 0.5 g / L polystyrenesulfonic acid aqueous solution (2.5 mL) was added to a 2.5 mM sodium citrate aqueous solution (50 mL), followed by heating to 35°C. Then, to the resulting solution was added 10 mM sodium borohydride solution (3 mL). Then 0.5 mM silver nitrate aqueous solution (50 mL) was added thereto at 20 mL / min with stirring. The solution was stirred for 30 min to prepare a seed solution (synthetic step of flat nuclei).

[0162] Then, ion-exchanged water (87.1 mL) was added to a 2.5 mM sodium citrate aqueous solution (132.7 mL), followed by heating to 35°C. Subsequently, 10 mM ascorbic acid aqueous solution (2 mL) was added to the resulting solution, and then 42.4 mL of the seed crystal solution prepared above was added thereto. Subsequently, a 0.5 mM silver nitrate aqueous solution (79.6 mL) was added thereto at 10 mL / min with stirring (first growth step of flat particles).

[0163] Then, the solution obtained ab...

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Abstract

Provided is a flat metal particle-containing composition Including flat metal particles and a heterocyclic ring compound, wherein the heterocyclic ring compound has a silver interaction potential EAg which is lower than -1 mV.

Description

technical field [0001] The present invention relates to compositions comprising flat metal particles suitable for applications such as heat ray reflective films, infrared reflective films, visible light reflective films, heat ray absorbing films, infrared absorbing films and selectively reflective films; also to selectively reflective and absorbing heat Rays of heat ray shielding material. Background technique [0002] Nanoparticles have dimensions smaller than the wavelength of light and are thus of interest as materials with low light scattering. Metal nanoparticles in particular have been researched in various fields because of their electrical conductivity, thermal conductivity, good refractive index, catalytic activity, and other properties. [0003] Metal nanoparticles have large surface areas and often suffer from problematic corrosion and migration. For example, US Patent Application 2007 / 0074316 discloses that aromatic triazole compounds and the like are advantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/06B22F1/0545
CPCB82Y30/00B22F1/0022B22F1/0545
Inventor 舟洼健细谷阳一
Owner FUJIFILM CORP
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