Preparation method of bionic super-hydrophobic acrylate modified polyurethane/nano particle composite coating

A technology of acrylate and nanoparticles, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor water resistance, achieve the effect of improving adhesion and ensuring superhydrophobicity

Inactive Publication Date: 2021-02-26
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem of poor water resistance of waterborne polyurethane, and realizes the preparation of superhydrophobic and durable waterborne polyurethane coating with double modification of waterborne polyurethane in physical and chemical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of acrylate-modified polyurethane water-based emulsion by the first component

[0023] a, Preparation of acrylate-modified polyurethane polymer

[0024] Mix diisocyanates, silicone polyols, hydrophilic chain extenders, catalysts, and small molecule chain extenders uniformly in a mass ratio of 100:60:6:0.1:0.5, put them into a four-necked flask, and place the four-necked The flask was placed in a constant temperature water tank, stirred and nitrogen gas was passed into the system, the temperature was kept at 70° C., and the temperature was kept for 2-4 hours. After the polymerization reaction is completed and the system cools down to room temperature, add an acrylate coupling agent in an amount such that the molar ratio of the hydroxyl group in the acrylate coupling agent to the residual isocyanate in the system is 1:5, and heat up to 85°C to react 4h. After the system was cooled to room temperature, n-butylamine was added to eliminate isocyanate, and t...

Embodiment 2

[0033] (1) Preparation of acrylate-modified polyurethane water-based emulsion by the first component

[0034] a, Preparation of acrylate-modified polyurethane polymer

[0035]Mix diisocyanates, silicone polyols, hydrophilic chain extenders, catalysts, and small molecule chain extenders evenly in a mass ratio of 100:65:7:0.2:0.6, put them into a four-necked flask, and place the four-necked The flask was placed in a constant temperature water tank, stirred and nitrogen gas was passed into the system, the temperature was kept at 70° C., and the temperature was kept for 2-4 hours. After the polymerization reaction is completed and the system cools down to room temperature, add an acrylate coupling agent in an amount such that the molar ratio of the hydroxyl group in the acrylate coupling agent to the residual isocyanate in the system is 1:5, and heat up to 85°C to react 4h. After the system was cooled to room temperature, n-butylamine was added to eliminate isocyanate, and the t...

Embodiment 3

[0044] (1) The first component prepares acrylate polyurethane water-based emulsion

[0045] a, Preparation of acrylate-modified polyurethane polymer

[0046] Mix diisocyanates, silicone polyols, hydrophilic chain extenders, catalysts, and small molecule chain extenders in a mass ratio of 100:70:8:0.3:1, put them into a four-necked flask, and place the four-necked The flask was placed in a constant temperature water tank, stirred and nitrogen gas was passed into the system, the temperature was kept at 70° C., and the temperature was kept for 2-4 hours. After the polymerization reaction is completed and the system cools down to room temperature, add an acrylate coupling agent in an amount such that the molar ratio of the hydroxyl group in the acrylate coupling agent to the residual isocyanate in the system is 1:5, and heat up to 85°C to react 4h. After the system was cooled to room temperature, n-butylamine was added to eliminate isocyanate, and the temperature was raised to 6...

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Abstract

The invention discloses a preparation method of a bionic super-hydrophobic acrylate modified polyurethane/nano particle composite coating, and belongs to the technical field of synthesis and modification of waterborne polyurethane. The super-hydrophobic coating prepared by the invention consists of a first component namely acrylate modified polyurethane and a second component namely modified silicon dioxide nano particles, wherein the first component is acrylate modified polyurethane emulsion that is prepared by taking organic silicon polyol, polyisocyanate, acrylate, a small molecular chain extender, a catalyst, a neutralizer, an acrylate coupling agent and water as raw materials; acrylate modified polyurethane emulsion and modified silicon dioxide nano particle dispersion liquid are sprayed on a base material, and the super-hydrophobic functional coating similar to a lotus leaf micro-nano rough surface structure is constructed. The surface of the membrane has a hydrophobic micro-nanostructure through a spraying method, so that the physical hydrophobic property of the surface of the membrane is enhanced; due to the introduction of polydimethylsiloxane, hydrophobic groups migrateto the surface during drying and curing, and the hydrophobicity of a matrix material of the membrane is improved due to chemical modification. A waterborne polyurethane coating film is prepared by taking a lotus leaf structure, a rough surface is endowed while the surface energy is low, so that the waterborne polyurethane coating film has super-strong hydrophobic performance, the water contact angle can reach 156 degrees to 162 degrees, the rolling angle is 3 degrees to 5 degrees, and the wear resistance is excellent.

Description

technical field [0001] The invention belongs to the field of superhydrophobic material manufacturing and relates to a preparation method of bionic superhydrophobic acrylate modified polyurethane / nanoparticles. Background technique [0002] In recent years, superhydrophobic materials have occupied an increasingly important position in the fields of self-cleaning, anti-ice and snow adhesion, and fluid drag reduction, so they have been studied more and more by researchers. At the same time, superhydrophobic materials have broad application prospects in people's life and science and technology fields due to their unique properties, so they have attracted much attention in recent years. By studying the internal mechanism of the formation of these natural superhydrophobic surfaces, many theoretical basis are provided for the artificial construction of superhydrophobic surfaces, and more design ideas are provided for the artificial development and development of multifunctional sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/16C09D7/62C09D7/20C08G18/12C08G18/65C08G18/67C08G18/61C08G18/34C08G18/32
CPCC08G18/12C08G18/3206C08G18/348C08G18/61C08G18/6511C08G18/6541C08G18/675C08K2201/011C09D175/16C09D7/20C09D7/62C08K9/06C08K3/36C08G18/672
Inventor 任秀艳徐资凯高光辉
Owner CHANGCHUN UNIV OF TECH
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