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Super-hydrophilic coating using organic polysilazane as anchor molecule and preparation method thereof

A polysilazane, super-hydrophilic technology, used in coatings, devices for coating liquids on surfaces, special surfaces, etc., can solve problems such as unstable coatings and weak adhesion

Active Publication Date: 2019-09-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a superhydrophilic coating with organopolysilazane as the anchor molecule and its preparation which has excellent adhesion strength with the substrate, simple preparation process, suitable for large-scale preparation and low cost method, to solve the problems that the superhydrophilic coating constructed with hydrophilic substances generally has weak adhesion with the substrate and the coating is unstable

Method used

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  • Super-hydrophilic coating using organic polysilazane as anchor molecule and preparation method thereof
  • Super-hydrophilic coating using organic polysilazane as anchor molecule and preparation method thereof
  • Super-hydrophilic coating using organic polysilazane as anchor molecule and preparation method thereof

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Effect test

Embodiment 1

[0042] (1) Modified SiO with carbon-carbon double bonds on the surface 2 Preparation of dispersion liquid of nanoparticles: 3.0g SiO 2 Ultrasonic dispersion of nanoparticles into absolute ethanol, formulated with 1wt% SiO 2 dispersion; then, 1.2g of vinyltrimethoxysilane and 2.0g of ethyl orthosilicate were added to the SiO 2 In the dispersion liquid, adjust the pH value of the dispersion liquid to 4 with an appropriate amount of dilute hydrochloric acid, and react the dispersion liquid system at a temperature of 60°C for 12 hours to obtain a modified SiO with reactive carbon-carbon double bonds on the surface. 2 dispersion of nanoparticles.

[0043] (2) Reactive organopolysilazane / SiO 2 Preparation of nanoparticle composite coating: dissolve organopolysilazane in acetone to prepare a 5wt% organopolysilazane solution; use spraying method to spray 2.0mL organopolysilazane solution on the pre-washed surface with ethanol The surface of the treated glass substrate (2.5cm×2.5cm...

Embodiment 2

[0055](1) Preparation of a dispersion of modified graphene oxide with a carbon-carbon double bond on the surface: 1.0g graphene oxide is ultrasonically dispersed in isopropanol to form a 1wt% graphene oxide dispersion; then, the Add 1.0g of γ-methacryloxypropyltrimethoxysilane and 2.0g of ethyl orthosilicate to the graphene oxide dispersion, adjust the pH of the dispersion to 4 with an appropriate amount of dilute hydrochloric acid, and make the dispersion The liquid system was reacted at a temperature of 70° C. for 18 hours to obtain a dispersion of modified graphene oxide with reactive carbon-carbon double bonds on the surface.

[0056] (2) Preparation of reactive organopolysilazane / graphene oxide composite coating: dissolve organopolysilazane in tetrahydrofuran, prepare 10wt% organopolysilazane solution; Scrape-coat 2 mL of organopolysilazane solution on the surface of a metal aluminum sheet (2cm×2cm) cleaned with ethanol in advance, and then squeegee-coat 2.0mL of modified...

Embodiment 3

[0068] (1) Preparation of a dispersion of modified montmorillonite with carbon-carbon double bonds on the surface: 0.5g montmorillonite is ultrasonically dispersed in methanol to form a 1wt% montmorillonite dispersion; then, 0.5g Vinyl tris(β-methoxyethoxy)silane and 1.0g ethyl orthosilicate were added to the montmorillonite dispersion, and the pH value of the dispersion was adjusted to 4 with an appropriate amount of dilute hydrochloric acid; the dispersion liquid React at a temperature of 80° C. for 10 hours to obtain a dispersion of modified montmorillonite with carbon-carbon double bonds on the surface.

[0069] (2) Preparation of reactive organopolysilazane / montmorillonite composite coating: dissolve organopolysilazane in ethyl acetate to prepare a 5wt% organopolysilazane solution; spin coating method, spin-coat 2.0mL organopolysilazane solution on the surface of a silicon wafer (3cm×3cm) cleaned with ethanol in advance, and then spin-coat 2.0mL modified montmorillonite o...

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Abstract

The invention discloses a super-hydrophilic coating using organic polysilazane as an anchor molecule and a preparation method thereof. The preparation method includes the steps that a preliminarily prepared organic polysilazane solution is adopted to coat the surface of a base material to form an organic polysilazane coating through a coating method; after a solvent evaporates, modified inorganicnanoparticles with reactive carbon-carbon double bonds on the surfaces are used for coating the surface, on which organic polysilazane is attached, of the base material, and through heat treatment, anorganic polysilazane / inorganic nanoparticle composite coating with reaction activity is obtained; betaine-type zwitterionic compounds with carbon-carbon double bonds are grafted onto the inorganic nanoparticles on the surface of the composite coating, and then hydrophilic modification is achieved. The water contact angle of the surface of the prepared hydrophilic modified coating is smaller than10 degrees, so that the super-hydrophilic coating has super-hydrophilic characteristics, and the coating and the surface of the base material have excellent attachment characteristics. The super-hydrophilic coating has good application effects of frogging prevention, self-cleaning, adhesion resistance of ships and underwater facility and the like.

Description

technical field [0001] The invention relates to the technical field of superhydrophilic coatings, in particular to a superhydrophilic coating using organopolysilazane as anchor molecules and a preparation method thereof. Background technique [0002] Super-hydrophilic materials whose surface contact angle of water droplets is less than 10° usually have excellent self-cleaning, anti-fouling, anti-fog, anti-adhesion and other properties, and are widely used in building materials, ships, liquid transportation, underwater facilities and medical materials. There are extremely wide applications. At present, the preparation methods of superhydrophilic surfaces mainly include etching, electrospinning, sol-gel method, and layer-by-layer self-assembly method. These preparation methods generally have the disadvantages of complicated process, high cost, and poor durability. The microstructure of the surface is easily damaged during use, and it is difficult to maintain stable superhydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/16C09D1/00C08J7/12C03C17/00B05D7/24B05D7/00B05D5/04
CPCB05D5/04B05D7/24B05D7/542B05D2451/00B05D2518/12C03C17/009C03C2217/40C03C2217/70C03C2218/111C03C2218/112C08J7/16C08J2383/16C09D1/00C09D183/16B05D2420/01
Inventor 李光吉熊博隋维伟李志豪罗南辉蒋国星
Owner SOUTH CHINA UNIV OF TECH
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