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Ultrahydrophobic powder, structure with ultrahydrophobic surface, and processes for producing these

A technology of super-hydrophobicity and manufacturing method, which can be used in chemical instruments and methods, papermaking, water repellent addition, etc., and can solve problems such as narrow application range.

Inactive Publication Date: 2011-07-06
KAWAMURA INST OF CHEM RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the range of technical application proposed by the aforementioned non-patent literature 5 is very narrow, and it is not an easy and convenient method in industry.

Method used

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  • Ultrahydrophobic powder, structure with ultrahydrophobic surface, and processes for producing these
  • Ultrahydrophobic powder, structure with ultrahydrophobic surface, and processes for producing these
  • Ultrahydrophobic powder, structure with ultrahydrophobic surface, and processes for producing these

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0133] Hereinafter, the present invention will be further described in detail through examples. In addition, unless otherwise specified, "%" means "mass %".

[0134] [Shape Analysis of Nanofiber Associations and Powders Using a Scanning Electron Microscope]

[0135] The separated and dried aggregates and powders were fixed on the sample support table with double-sided tape, and observed with the surface observation device VE-9800 manufactured by KEYENCE CORPORATION.

[0136] [Observation of Nanostructures Using Transmission Electron Microscopy]

[0137] A sample in a powder state was dispersed in methanol, placed on a copper grid, and observed with a transmission electron microscope "JEM-2200FS" manufactured by JEOL Ltd.

[0138] [Contact angle measurement]

[0139] The contact angle was measured with an automatic contact angle meter Contact Angle System OCA (manufactured by Dataphysics).

[0140] [Differential calorimetry analysis]

[0141] The content of the compound (X...

Synthetic example 1

[0145] [Synthesis of an association of organic-inorganic composite nanofibers (I)]

[0146]Using the method disclosed in the patent literature (Japanese Patent Application Laid-Open No. 2005-264421, Japanese Patent Laid-Open No. 2005-336440, Japanese Patent Laid-Open No. 2006-063097, and Japanese Patent Laid-Open No. 2007-051056) to produce powders with different shapes .

[0147] 5 g of commercially available polyethyloxazoline (number average molecular weight 500,000, average degree of polymerization 5,000, manufactured by Aldrich) was dissolved in 20 mL of 5M aqueous hydrochloric acid. The solution was heated to 90° C. with an oil bath, and stirred at this temperature for 10 hours. 50 mL of acetone was added to the reaction solution to completely precipitate the polymer, which was filtered and washed three times with methanol to obtain white polyethyleneimine powder. The resulting powder is used 1 H-NMR (heavy water) identification, confirmation is derived from the peak ...

Synthetic example 2

[0152] [Synthesis of an association of nanofibers (II) mainly composed of silica]

[0153] 5 g of the powder (I-1) obtained in Synthesis Example 1 was heated in an electric furnace at 600° C. for 2 hours under the condition of introducing air to remove the polyethyleneimine contained in the powder (I-1) to obtain a white powder body (II-1). The specific surface area is 187m 2 / g. figure 2 The SEM photograph of powder (II-1) is shown. It shows that the nanofiber structure does not change after calcination.

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Abstract

A process for producing an ultrahydrophobic powder which is a powder comprising silica as the main component and the surface of which has a contact angle with water of 150 DEG or larger; and a structure having an ultrahydrophobic surface comprising the powder. The process comprises: introducing hydrophobic groups into the silica present in the surface of aggregates of organic / inorganic composite nanofibers obtained by combining a polymer, which is an organic substance, with silica, which is an inorganic substance, on the order of nanometer or into the silica obtained by burning the organic / inorganic composite nanofibers and removing the polymer therefrom; and thereby making a powder composed of the aggregates ultrahydrophobic. Also provided is an ultrahydrophobic powder obtained by the process. The structure having an ultrahydrophobic surface is obtained by fixing the ultrahydrophobic powder to a surface of a solid base.

Description

technical field [0001] The present invention relates to a superhydrophobic powder whose basic structure is an association of silica-based nanofibers having a hydrophobic group, a structure having a superhydrophobic surface using the powder, and methods for producing these. Background technique [0002] When a solid surface contacts a water droplet, the case where the contact angle of the water droplet is 150° or more is defined as superhydrophobicity. A contact angle in the range of 70° to 150° is defined as hydrophobicity. Generally, hydrophobicity is expressed by covering the surface with molecular residues with low surface tension, but it is difficult to express superhydrophobicity only with molecular residues with low surface tension. [0003] On the other hand, there are many substances exhibiting superhydrophobicity among organisms in the natural world. For example, the leaves of lotus, rice, cabbage, etc. have superhydrophobicity (super water repellency) that does n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/79C01B33/18C08K3/36C08K9/06C08L79/02C09K3/18C09D7/62
CPCC08L79/02C08K3/36C09D7/1225D06M2200/12C01B33/151C09D7/1291C08K9/02D06M11/79C08G73/0206C09D7/1283C01B33/18D21H19/40D21H21/16D21H19/42C09D7/69C09D7/62C09D7/70B82Y40/00D06M11/78D06M15/643D10B2401/021
Inventor 金仁华袁建军
Owner KAWAMURA INST OF CHEM RES