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A self-layered gradient fluorine-silicon-based superhydrophobic coating and its preparation process

A super-hydrophobic coating and self-layering technology, which is applied in coatings, polyurea/polyurethane coatings, etc., can solve the problems of difficult maintenance, high cross-linking and curing temperature of coatings, complicated preparation process, etc., and achieve simple and easy preparation process Good durability, good hardness and flexibility

Active Publication Date: 2019-09-10
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluorosilicone resins combine the low surface energy of fluororesins with the weather resistance of silicone resins, and have been widely studied. However, when they are applied to superhydrophobic coatings, expensive mechanical equipment is usually required and the preparation process is complicated; or The combination of two layers of coating on the bottom surface is required, which makes maintenance difficult to achieve in practical applications; or it takes a long time to dry, which affects the use; and the cross-linking and curing temperature of the coating is high.

Method used

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  • A self-layered gradient fluorine-silicon-based superhydrophobic coating and its preparation process
  • A self-layered gradient fluorine-silicon-based superhydrophobic coating and its preparation process
  • A self-layered gradient fluorine-silicon-based superhydrophobic coating and its preparation process

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preparation example Construction

[0055] In order to obtain a better self-layered gradient fluorine-silicon-based superhydrophobic coating, the present application has optimized a method for preparing a self-layered gradient fluorine-silicon-based superhydrophobic coating, including the following steps:

[0056] (1) Nano SiO 2 Modification of powder: Add a certain amount of deionized water (w=5%) into absolute ethanol, mix well and add a certain amount of silane coupling agent or organosilicon compound, ultrasonically disperse for 3 minutes to 5 minutes, and the nano SiO 2 Add the powder into the solution, heat and stir, the temperature is 50°C-70°C, the reaction time is 6h-8h, aged at 80°C for 12-18h, ultrasonically cleaned with ethanol, centrifuged, repeated three times, and then dried at 80°C for 3h ~6h, prepared modified nano-SiO 2 Powder;

[0057] (2) Modification of nano-silica sol: add a certain amount of deionized water (w=5%) into absolute ethanol, adjust the pH value to 4±0.5 with acetic acid afte...

Embodiment 1

[0066] A self-layered gradient fluorosilicone-based superhydrophobic coating, including two components with the following mass percentages of A and B, and component A is composed of the following substances in weight percentages: 50% fluorosilicone resin, 30% diluting solvent, and dispersing solvent 10%, modified nano-SiO 2 Powder 3%, modified nano silica sol 6%, coupling agent 0.5%, defoamer 0.2%, leveling agent 0.3%. Component B: Aliphatic polyisocyanate. The mass ratio of A and B components is 25:1.

[0067] The dilution solvent is a mixture of butyl acetate, xylene and propylene glycol methyl ether acetate, and the weight ratio is 1:1:1. Butyl acetate, xylene, and propylene glycol methyl ether acetate have good solubility for fluorosilicone resins. However, due to the relatively fast volatilization rate of butyl acetate, xylene and propylene glycol methyl ether acetate can reduce the volatilization of diluent solvents. Speed, in order to adjust the volatilization rate a...

Embodiment 2

[0080] The present embodiment raw material is identical with the raw material of embodiment 1.

[0081] The preparation method of the self-layered gradient fluorine-silicon-based superhydrophobic coating of this embodiment comprises the following steps:

[0082] (1) Nano SiO 2 Modification of powder: Add a certain amount of deionized water (w=5%) into absolute ethanol, add KH550 after mixing, ultrasonically disperse for 3 minutes, and mix nano-SiO 2 The powder is added to the solution, heated and stirred, the temperature is 50°C, the reaction time is 6h, aged at 80°C for 12h, ultrasonically cleaned with ethanol, centrifuged, repeated three times, and then dried at 80°C for 3h to obtain modified nano-SiO 2 Powder;

[0083] (2) Modification of nano-silica sol: add a certain amount of deionized water (w=5%) in absolute ethanol, adjust the pH value to about 4 with acetic acid after mixing, add a certain amount of dodecafluoroheptyl Propyltrimethoxysilane, ultrasonically dispers...

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Abstract

The invention discloses a self-layered gradient fluorine-silicon-based superhydrophobic coating and a preparation process thereof. The self-layered gradient fluorine-silicon-based superhydrophobic coating material is composed of A component and B component, and the A component is composed of fluorine-silicon Resin, dilution solvent, dispersion solvent, modified nano-SiO 2 Powder, modified nano silica sol, coupling agent, defoamer and leveling agent, the B component is aliphatic polyisocyanate. The method can solve the shortcomings in the prior art such as complex preparation process of the superhydrophobic coating, long drying time, high cross-linking and curing temperature, and double layers on the bottom surface. The water contact angle of the superhydrophobic coating prepared by the invention can reach more than 151°, and the rolling angle is about 3°. The preparation process is simple and easy, no expensive and complicated equipment is needed, and adhesion, superhydrophobicity, and good flexibility are taken into account.

Description

technical field [0001] The invention belongs to the technical field of preparation of super-hydrophobic coatings, and in particular relates to a self-layered gradient fluorine-silicon-based super-hydrophobic coating and a preparation process thereof. Background technique [0002] There are many superhydrophobic organisms in nature, such as lotus leaves that emerge from the mud without staining, butterfly wings, etc. It is precisely because of this super-hydrophobic property that humans cannot match in nature that it has attracted attention and research on super-hydrophobic materials. Superhydrophobicity is a special state of surface wettability. Wettability is an interfacial phenomenon of a solid surface, which refers to the ability of a liquid to spread on a solid surface. Wettability is usually measured by the contact angle of a liquid on a solid surface. It is generally believed that when the contact angle is greater than 150° and the rolling angle is less than 10°, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/08C09D175/00C09D7/62C09D7/63
Inventor 吴亚平李辛庚米春旭王晓明郭凯宗立君张振岳闫风洁姜波樊志彬王蝶李文静
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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