A kind of superhydrophilic functional coating based on cage polysilsesquioxane and preparation method thereof

A technology of polysilsesquioxane and secondary aminosiloxane, which is applied in the field of superhydrophilic materials, can solve problems such as inability to guarantee long-term performance, resistance to wiping and solvents, and limited application range, and achieve simple, fast and quick preparation , Overcoming harsh preparation conditions and overcoming technical difficulties

Active Publication Date: 2022-02-25
广州一新科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The single-component titanium dioxide superhydrophilic coating no longer exhibits hydrophilicity after being irradiated by ultraviolet light, but its long-term effect cannot be guaranteed indoors, which limits its application range
The surfactant is easy to lose, not resistant to wiping and solvents
[0005] On the other hand, many superhydrophilic coatings that introduce silica nanopartic

Method used

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  • A kind of superhydrophilic functional coating based on cage polysilsesquioxane and preparation method thereof

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preparation example Construction

[0038] A kind of preparation method of the superhydrophilic functional coating based on cage polysilsesquioxane of the present invention, described preparation method comprises the following steps:

[0039] Add a certain amount of epoxy-based cage polysilsesquioxane into the container, then add a certain amount of solvent, add 8 times the molar ratio of secondary aminosiloxane under stirring, and wait for a period of time after reaction. The main resin with alkoxy groups prepared by the reaction of cage polysilsesquioxane and secondary aminosiloxane; add hydrophilic nano-silica to the container, and stir well to obtain a cage-based polysilsesquioxane The precursor solution of the super-hydrophilic functional coating of alkane; the precursor solution is coated on the surface of the substrate, and reacted for 24 hours at room temperature to obtain the super-hydrophilic functional coating.

[0040] The superhydrophilic coating of the present invention can be applied to glass, sta...

Embodiment 1

[0042] Add 60g of ethanol to a 500ml two-necked flask, and add glycidyl etheroxypropyl cage polysilsesquioxane under stirring 6g, then add 9.8g N-n-butyl-3-aminopropyltrimethoxysilane, add Evonik hydrophilic silica 33g ( 200), after stirring evenly, a precursor solution with a solid content of about 45% was obtained.

[0043]The precursor is easily coated on the surface of the substrate by spraying, and the super-hydrophilic coating is obtained after curing at room temperature for 24 hours. The water contact angle of the super-hydrophilic coating has been tested to be 4°.

Embodiment 2

[0045] Add 200g of ethanol to a 500ml two-necked flask, and add glycidyl etheroxypropyl cage polysilsesquioxane under stirring 5g, then add 7.6g 3-(phenylamino) propylmethoxysilane, add Evonik hydrophilic silica 63g ( 380), and after stirring evenly, a precursor solution with a solid content of about 27% was obtained.

[0046] The precursor is easily coated on the surface of the substrate by spraying, and the super-hydrophilic coating is obtained after curing at room temperature for 24 hours. The water contact angle of the super-hydrophilic coating is detected to be 3°.

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Abstract

The invention discloses a superhydrophilic functional coating based on caged polysilsesquioxane. The precursor solution of the superhydrophilic functional coating includes a main body resin, hydrophilic nano silicon dioxide particles and a solvent; the The host resin is an alkoxyl-bearing host resin prepared by reacting epoxy-based cage polysilsesquioxane and secondary aminosiloxane. The precursor solution of the superhydrophilic functional coating of the present invention includes a main body resin, hydrophilic nano silicon dioxide particles and a solvent. The main resin with alkoxy reactive functional groups is prepared by reacting epoxy cage polysilsesquioxane with secondary aminosiloxane, and with hydrophilic nano-silica particles, cage polysilsesquioxane The nanometer size effect of alkane and the size effect of hydrophilic nano silicon dioxide are used to prepare a superhydrophilic coating with a certain surface roughness and hydroxyl hydrophilic groups on the surface, and the water contact angle is less than 5°. At the same time, the presence of caged polysilsesquioxane can effectively promote the dispersion effect of nano-silica.

Description

technical field [0001] The invention belongs to the technical field of superhydrophilic materials, in particular to a cage polysilsesquioxane-based superhydrophilic functional coating and a preparation method thereof. Background technique [0002] Surface wettability is one of the important characteristics of solid surfaces, and its research progress has always attracted the attention and favor of scholars. Generally, the contact angle (CA) is used to characterize the degree of wetting of the liquid on the solid surface. When the contact angle between water and the solid surface is less than 5°, it is considered to be a super-hydrophilic surface. The degree of hydrophilicity depends on the structure and chemistry of the coating surface. Ingredients decide. Due to its good wetting properties, the super-hydrophilic surface can spread water instantly and evaporate quickly, preventing water droplets from sticking and staying on the surface, which can block and isolate dirt, and...

Claims

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Application Information

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IPC IPC(8): C09D183/08C09D7/61C08G77/14C08G77/388
CPCC09D183/08C09D7/61C09D7/67C08G77/14C08G77/388C08K2201/011C08K2201/005C08K3/36
Inventor 伍淼罗鹏王勇孙华伟
Owner 广州一新科技有限公司
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