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An organic-inorganic hybrid gradient wetting coating and its preparation method

A gradient wetting and organic technology, applied in the direction of coating, etc., to achieve mild reaction conditions, simple preparation method, and overcome the limitation of the substrate

Inactive Publication Date: 2014-10-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses the self-assembly of alkyl trichlorosilane to construct a gradient surface, and its substrate needs to be a silicon wafer, which has certain restrictions on the use of this gradient surface.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 70g of acrylic acid and 2.1g of azobisisobutyronitrile into 280g of absolute ethanol, and carry out free radical polymerization at a water bath temperature of 85°C for 6 hours to prepare an organic-inorganic hybrid hydrophilic material, and measure its solid The content is 23.7%;

[0030](2) Add 10g of acrylic acid, 1.0g of hexafluorobutyl acrylate, and 0.33g of azobisisobutyronitrile into 60g of absolute ethanol, and carry out free radical polymerization at a water bath temperature of 85°C for 5 hours to prepare acrylic acid containing fluorine Polymer, measuring its solid content is 15.3%;

[0031] (3) Wash the glass flakes sequentially with acetone, absolute ethanol, and distilled water, immerse the glass flakes in 150g of the organic-inorganic hybrid hydrophilic material obtained in step (1), and then slowly drop 7.11g of hexamethoxymethyl Melamine curing agent, the dropping time is 25min. While dropping, use a tensile machine to clamp the glass sheet and p...

Embodiment 2

[0035] (1) Add 7g of ethyl orthosilicate and 3.5g of vinyltrimethoxysilane to 13.91g of absolute ethanol, then add 5.44g of water while stirring, and then add 10% of Adjust the pH to 3 with dilute hydrochloric acid, and hydrolyze at 60°C for 7 hours to obtain silica sol;

[0036] (2) Add silica sol, 63g of acrylic acid, and 2.0g of azobisisobutyronitrile into 270g of absolute ethanol in step (1), and carry out free radical polymerization at a water bath temperature of 85°C for 6 hours to prepare an organic-inorganic hybrid Hydrophilic material, its solid content is measured to be 22.9%;

[0037] (3) Add 10g of acrylic acid, 1.0g of hexafluorobutyl acrylate, and 0.33g of azobisisobutyronitrile into 60g of absolute ethanol, and carry out free radical polymerization at a water bath temperature of 85°C for 5 hours to prepare acrylic fluorine-containing Polymer, measuring its solid content is 15.3%;

[0038] (4) Wash the glass piece with acetone, absolute ethanol, and distilled w...

Embodiment 3

[0042] (1) Add 15g of tetraethyl orthosilicate and 1.5g of vinyltrimethoxysilane to 24.15g of absolute ethanol, add 8.00g of water while stirring, and then add 10% of Adjust the pH to 3 with dilute hydrochloric acid, and hydrolyze at 60°C for 6 hours to obtain silica sol;

[0043] (2) Add silica sol, 15g of acrylic acid, and 0.495g of azobisisobutyronitrile into 100g of absolute ethanol in step (1), and carry out free radical polymerization at a water bath temperature of 85°C for 6 hours to prepare an organic-inorganic hetero Hydrophilic material, measured its solid content as 16.3%;

[0044] (3) Add 20g of acrylic acid, 1g of perfluoroalkylethyl methacrylate, and 0.63g of azobisisobutyronitrile into 60g of absolute ethanol, and carry out free radical polymerization at a water bath temperature of 85°C for 5 hours to prepare Acrylic fluoropolymer, the measured solid content is 23.5%;

[0045] (4) Wash the glass flakes sequentially with acetone, absolute ethanol, and distilled...

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Abstract

The invention provides an organic-inorganic hybrid gradient wetting coating and a preparation method thereof. Siloxane coupling agent and tetraethyl orthosilicate are used to prepare silica sol by sol-gel method, and reactive hydrophilic Free radical polymerization of monomers, or organic-inorganic hybrid hydrophilic materials obtained only by free radical polymerization of responsive hydrophilic monomers; reactive hydrophilic monomers and acrylate fluorine-containing monomers are copolymerized to obtain acrylic Fluorine-containing polymers, acrylic monomers can also be added during copolymerization; finally, the substrate is soaked in the organic-inorganic hybrid hydrophilic material, and the curing agent and acrylic fluoropolymers are sequentially added while pulling the substrate, After the coated substrate is obtained, a continuous and stepwise gradient wetting coating with a contact angle of 10° to 100° can be obtained through high temperature curing and crosslinking. The gradient wetting coating prepared by the invention has no reaction with the substrate, and does not realize the gradient by the substrate, which effectively overcomes the limitation of the substrate.

Description

technical field [0001] The invention relates to a gradient wetting coating, in particular to an organic-inorganic hybrid gradient wetting coating and a preparation method thereof. Background technique [0002] Gradient wetting coatings have potential applications in promoting the migration (flow) of liquid droplets and microfluidics, as well as enhancing the heat transfer process of gas-phase droplet condensation and the heat dissipation performance of microheat pipes. Gas-phase drop condensation heat transfer is one of the more effective cooling methods and has been used in many fields. Drop condensation gradually replaces traditional film condensation because of its high heat transfer efficiency. In the process of droplet condensation, the gradient surface energy change of the condensation surface—that is, the continuous change of surface affinity / hydrophobicity along the direction of droplet movement on the surface can promote droplet movement, coalescence, growth, and sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F220/06C08F220/22C08F220/24C08F220/56C08F220/58C08F220/18C09D151/10C09D133/02C09D133/16
Inventor 程江陶玉红皮丕辉文秀芳蔡智奇杨卓如
Owner SOUTH CHINA UNIV OF TECH