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Super-hydrophobic coating material and preparation method thereof

A coating material and super-hydrophobic technology, applied in antifouling/underwater coatings, coatings, polyurea/polyurethane coatings, etc. Particles are easy to agglomerate and other problems, achieving excellent water resistance and self-cleaning, reducing agglomeration, and low production equipment requirements

Inactive Publication Date: 2016-07-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the coating method is the simplest and most effective, but there are still some problems in the current coating technology, such as the particles in the coating liquid are easy to agglomerate, which makes the surface structure of the coating uneven, resulting in a decline in super-hydrophobic performance.

Method used

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  • Super-hydrophobic coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] At 75 °C, 2 g of SiO 2 Microspheres (2 μm in diameter) were dispersed in 5 g of paraffin wax with a melting point of 60 °C, and then mixed with 55 mL of -1 The aqueous solution of didodecyldimethylammonium bromide (DDAB) was mixed and stirred magnetically at a speed of 1500rpm for 15min to obtain an emulsion; cooled to room temperature, the paraffin was solidified, filtered, and the paraffin colloid was washed with deionized water to remove untreated Adhered or weakly adhered microspheres; after drying under vacuum for 5h, placed in 30mL of 2mM dichlorodimethylsilane (DCDMS) methanol solution, added 3mL of 2mM triethylamine solution to elevate Reaction rate, react for 25min, then filter the reaction solution, dissolve the obtained solid in chloroform at room temperature, wash with 300mL chloroform and 1200mL ethanol, then disperse it in 25mL ethanol, and ultrasonically disperse for 35min to obtain amphiphilic SiO 2 suspension of microspheres.

[0023] 25mL amphiphilic...

Embodiment 2

[0026] At 85 °C, 1 g of SiO was mixed by stirring 2 Microspheres (2 μm in diameter) were dispersed in 5 g of paraffin wax with a melting point of 65 °C, and then mixed with 75 mL of 70 mg·L -1 The aqueous solution of didodecyldimethylammonium bromide (DDAB) was mixed and stirred magnetically at a speed of 1500rpm for 15min to obtain an emulsion; cooled to room temperature, the paraffin was solidified, filtered, and the paraffin colloid was washed with deionized water to remove untreated Attached or weakly adhered microspheres; after drying under vacuum for 5h, place in 30mL of 2mM dichlorodimethylsilane (DCDMS) methanol solution for 15min, add 2mL of 2mM triethylamine solution To increase the reaction rate; filter the colloid, dissolve paraffin in chloroform at room temperature, wash with 300mL chloroform and 1200mL ethanol, and then disperse it in 25mL ethanol; react under ultrasonic conditions for 25min to obtain amphiphilic SiO 2 suspension of microspheres.

[0027] 25mL ...

Embodiment 3

[0030] At 80 °C, 2 g SiO 2 Microspheres (2 μm in diameter) were dispersed in 5 g of paraffin wax with a melting point of 65 °C, and then mixed with 83 mL of 55 mg·L -1 Mix the aqueous solution of dihexadecyldimethylammonium bromide, stir magnetically at a speed of 1500rpm for 15min to obtain an emulsion; cool to room temperature, the paraffin solidifies, filter, and wash the paraffin colloid with deionized water to remove unattached or sticky wax in the solution. Attach weaker microspheres; after drying under vacuum for 5h, place in 30mL of 2mM dichlorodimethylsilane (DCDMS) methanol solution to react for 20min, add 3mL of 2mM triethylamine solution to enhance the reaction Rate; filter the colloid, dissolve paraffin in chloroform at room temperature, wash with 300mL chloroform and 1200mL ethanol, and then disperse it in 35mL ethanol; react under ultrasonic conditions for 35min to obtain amphiphilic SiO 2 suspension of microspheres.

[0031] 35mL amphiphilic SiO 2 The suspen...

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Abstract

The invention relates to a super-hydrophobic coating material and a preparation method thereof.The super-hydrophobic coating material is an amphipathic SiO2 microsphere / water-based polyurethane composite, the contact angle of the material and water is 153-161 degrees, and the rolling angle of water drops on the surface of the material is 4.8-7.6 degrees.The preparation method includes the steps of firstly, preparing suspension liquid of amphipathic SiO2 microspheres; secondly, mixing the suspension liquid of amphipathic SiO2 microspheres with water-based polyurethane dispersing liquid to be evenly dispersed through ultrasonic waves to obtain a coating solution, evenly coating the surface of the base material with the coating solution, and drying to obtain the super-hydrophobic coating material.The amphipathic SiO2 microspheres are self-assembled in the water-based polyurethane dispersing liquid to form the composite of a uniform surface microstructure; the coating material has quite excellent waterproofing performance and self-cleaning performance on the surface and can be widely applied to the fields of building internal and external wall decoration plates, building sunshade plates and the like.

Description

technical field [0001] The invention belongs to the technical field of hydrophobic materials and relates to an amphiphilic SiO 2 Microsphere / waterborne polyurethane composite coating material and preparation method thereof. Background technique [0002] In nature, the super-hydrophobic surface of many animals and plants gives them great advantages in survival, such as the feet of geckos, the surface of lotus leaves, etc. These special surface structures have attracted extensive attention from researchers. Super-hydrophobic surface refers to the surface with a static contact angle greater than 150° and a rolling angle less than 10°. Water droplets can easily roll back and forth on this surface, which makes the surface self-cleaning, impervious to water, and antifouling. Features, so as to achieve anti-icing, anti-frost, anti-pollution, prevent the surface of the material from reacting with other substances and prolong the service life. [0003] Most of the things produced b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/12C09D5/16
CPCC08K3/36C08K9/04C08K9/06C08K9/10C09D5/1618C09D7/62C09D175/04
Inventor 马保国江奇黄健王新李相国蹇守卫谭洪波
Owner WUHAN UNIV OF TECH
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