Super-hydrophobic composite coating, and preparation method and application thereof

A composite coating and super-hydrophobic technology, applied in the field of composite coatings, can solve problems such as insufficient adhesion, complicated process, and shedding, and achieve excellent wear resistance and hydrophobicity, convenient use, and simple production process.

Active Publication Date: 2018-05-11
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method to improve the wear resistance of superhydrophobic surface is to dope various particles in the coating to increase the wear resistance of the coating, but these methods still have defects such as high cost and complicated process, and the doped particles sometimes cause Insufficient adhesion and fall off during use, thus affecting the wear resistance

Method used

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  • Super-hydrophobic composite coating, and preparation method and application thereof
  • Super-hydrophobic composite coating, and preparation method and application thereof
  • Super-hydrophobic composite coating, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] CNC-SiO 2 Preparation of Superhydrophobic Composite Coatings

[0041]Use diameter to be 3nm-5nm, length is the nano-cellulose whisker (CelluloseNanocrystal, CNC) of 100nm-300nm to be formulated into the aqueous suspension that CNC concentration is 4wt%, the CNC aqueous suspension that configures is placed in molecular weight cut-off 12000- 14000 dialysis bag, with absolute ethanol for dialysis. The time of each dialysis treatment is 12 hours, and a total of 6 dialysis treatments are carried out. After the treatment is completed, the ethanol suspension of CNC is obtained by fully stirring. Then, it was heated in a water bath to volatilize the ethanol, and it was prepared into an ethanol suspension with a CNC concentration of 1 wt%.

[0042] Take 50 mL of the above-mentioned CNC suspension in ethanol with a concentration of 1 wt%, mix it with 3 mL of 25% ammonia water, and stir at 50°C for 20 minutes, then add 3 mL of tetraethyl orthosilicate (analytical grade, the same...

Embodiment 2

[0047] CNC-SiO 2 Preparation of Superhydrophobic Composite Coatings

[0048] Use a CNC with a diameter of 3nm-5nm and a length of 100nm-300nm to prepare an aqueous suspension with a CNC concentration of 4wt%, place the configured CNC aqueous suspension in a dialysis bag with a molecular weight cut-off of 12000-14000, and use absolute ethanol Perform dialysis. The time of each dialysis treatment is 24 hours, and the dialysis treatment is carried out 3 times in total. After the treatment is completed, the ethanol suspension of CNC is obtained by fully stirring. Then it was diluted with anhydrous ethanol to prepare CNC with a concentration of 3wt% ethanol suspension.

[0049] Take 50mL of the above-mentioned CNC with a concentration of 3wt% ethanol suspension, mix it with 8mL of 25% ammonia water, and stir at 50°C for 20 minutes, then add 8mL tetraethyl orthosilicate and continue stirring for 2 hours to obtain a CNC-SiO 2 complex suspension.

[0050] Then add 2 mL of POTS and...

Embodiment 3

[0054] CNC-SiO 2 Preparation of Superhydrophobic Composite Coatings

[0055] Use a CNC with a diameter of 3nm-5nm and a length of 100nm-300nm to prepare an aqueous suspension with a CNC concentration of 3wt%, place the configured CNC aqueous suspension in a dialysis bag with a molecular weight cut-off of 12000-14000, and use absolute ethanol Perform dialysis. The time of each dialysis treatment is 18 hours, and a total of 4 dialysis treatments are carried out. After the treatment is completed, the ethanol suspension of CNC is obtained by fully stirring. Then by diluting with absolute ethanol, it is formulated into CNC ethanol suspension with the concentration of CNC being 2wt%.

[0056] Take 50mL of CNC ethanol suspension with a concentration of 2wt%, mix it with 4mL of 25% ammonia water, stir at 50°C for 20 minutes, then add 4mL of tetraethyl orthosilicate and continue stirring for 1.5 hours to obtain a CNC-SiO 2 complex suspension.

[0057] Then add 1 mL of POTS and cont...

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Abstract

The invention provides a super-hydrophobic composite coating. The super-hydrophobic composite coating comprises nano cellulose whiskers and hydrophobically modified silicon dioxide compounded on the nano cellulose whiskers. The invention also provides a preparation method and application of the super-hydrophobic composite coating. Through the structure that the silica particles are compounded on the nano cellulose whiskers, lasting wear resistance is provided for the super-hydrophobic coating. The coating has a simple preparation process, and can be conveniently used for preparing a super-hydrophobic coating.

Description

technical field [0001] The invention relates to the field of composite coatings, in particular to a superhydrophobic composite coating and its preparation method and application. Background technique [0002] It is generally believed that a surface with a water contact angle greater than 150° is called a superhydrophobic surface. Superhydrophobic surfaces have important applications in self-cleaning, anti-icing, anti-fog, etc. Reasonable surface roughness and low surface free energy are two basic conditions for the preparation of superhydrophobic surfaces. With the development of science and technology, a large number of technical methods for preparing superhydrophobic surfaces have emerged, such as sol-gel method, layer-by-layer assembly method, spraying method, chemical vapor deposition method, etc. Although superhydrophobic surfaces have been prepared by many methods, the biggest problem facing superhydrophobic surfaces at present is their poor wear resistance, which le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D101/04C09D7/62C03C17/00B27K3/00B27K3/12B27K3/50D21H19/14D21H19/34D21H21/16
CPCB27K3/007B27K3/12B27K3/50B27K2240/70C03C17/007C03C17/009C03C2217/29C03C2217/465C03C2217/478C08K3/36C08K9/06C09D101/04D21H19/14D21H19/34D21H21/16
Inventor 吕少一黄景达王思群傅峰
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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