A photocatalytic self-healing superhydrophobic coating and its preparation method

A technology of super-hydrophobic coatings and super-hydrophobic coatings, applied in the direction of polyester coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of no self-healing, super-hydrophobic performance, etc., and achieve simple preparation process and recovery Super-hydrophobic performance, the effect of ensuring long-term serviceability

Active Publication Date: 2017-11-17
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-healing function of the coating prepared by this method is still limited to the self-healing of the chemical substances on the surface of the damaged coating, and has no self-healing property for destroying the micro-nano structure of the surface, and the coating is used outdoors when it encounters organic When pollutants are present, the superhydrophobic properties will be affected
Therefore, the existing reports on durable superhydrophobic coatings all focus on the self-healing of surface hydrophobic substances, or endow superhydrophobic surfaces with the ability to photocatalytically decompose organic pollutants, while the self-healing of micro-nano structures, another element of superhydrophobic properties, is of great importance. No report

Method used

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  • A photocatalytic self-healing superhydrophobic coating and its preparation method
  • A photocatalytic self-healing superhydrophobic coating and its preparation method
  • A photocatalytic self-healing superhydrophobic coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Mix 30 parts of hydrophilic SiO 2 Disperse the nanoparticles in 600 parts of ethanol, then add 3.0 parts of ammonia water and 3.2 parts of heptadecafluorodecyltrimethoxysilane, mix well and then react at 60°C for 24 hours, wash and dry to obtain hydrophobic nano-SiO 2 .

[0044] 2) Add 0.53 parts of BYK182 dispersant, 0.38 parts of BYK306 leveling agent and 0.32 parts of BYK052 defoamer to 100 parts of butyl acetate, and after shearing and dispersing for 10 minutes, the hydrophobic nano-SiO obtained in step 1) 2 and 6 parts of photocatalytic TiO 2 Nanoparticles were added to 100 parts of butyl acetate, and sheared and dispersed for 10 minutes; then 40 parts of polystyrene, 19 parts of fluorine-containing hydroxypropyl silicone oil (molecular weight 8000g / mol) and 10 parts of dodecafluoroheptylpropyl trimethyl The oxysilane was added to the above dispersion liquid, and sheared and dispersed for 2 hours to obtain a nanocomposite coating. Spray the prepared coating o...

Embodiment 2

[0047] 1) Add 30 parts of Fe 3 o 4 Disperse the nanoparticles in 600 parts of ethanol, then add 4 parts of ammonia water and 3.8 parts of dodecafluoroheptylpropyltrimethoxysilane, mix well and then react at 65°C for 22 hours, wash and dry to obtain hydrophobic nano-Fe 3 o 4 .

[0048] 2) Add 0.50 parts of Deqian 903 dispersant, 0.35 parts of Deqian 435 leveling agent and 0.30 parts of Deqian 3100 defoamer to 100 parts of xylene, and shear and disperse for 10 minutes. Fe 3 o 4 and 7.5 parts of ZnO nanoparticles were added to 120 parts of xylene, sheared and dispersed for 10 minutes; then 35 parts of polymethyl methacrylate, 25 parts of fluorine-containing vinyl silicone oil (molecular weight 7000g / mol) and 8 parts of heptadecafluoro Add decyltrimethoxysilane to the above dispersion liquid, and shear and disperse for 2 hours to prepare a nanocomposite coating. The prepared paint roller is coated on the tinplate, and dried at 100°C for 10 minutes to obtain a super-hydrophob...

Embodiment 3

[0050] 1) Add 30 parts of Al 2 o 3 Nanoparticles are dispersed in 600 parts of ethanol, then 3.5 parts of ammonia water and 3.5 parts of tridecafluorooctyltrimethoxysilane are added, mixed evenly and then reacted at 75°C for 18 hours, washed and dried to obtain hydrophobic nano-Al 2 o 3 .

[0051] 2) Add 0.50 parts of EFKA-4061 dispersant, 0.38 parts of CN322 leveling agent and 0.35 parts of Deqian 6800 defoamer to 100 parts of acetone, and after 10 minutes of shear dispersion, the hydrophobic nano-Al 2 o 3 and 8 parts of ZnS nanoparticles were added to 90 parts of acetone, and sheared and dispersed for 10 minutes; then 42 parts of polyurethane, 18 parts of fluorine-containing hydroxypropyl silicone oil (molecular weight 8500g / mol) and 9 parts of heptadecafluorodecyltrimethoxy The silane was added to the above dispersion liquid, and sheared and dispersed for 2 hours to obtain a nanocomposite coating. Brush the prepared paint onto tinplate, and dry it at 60°C for 10 minute...

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Abstract

The invention belongs to the technical field of new chemical materials, and relates to a composition of a photocatalytic self-repairing superhydrophobic coating and a preparation method thereof. The coating of the present invention consists of 10-50% of thermoplastic film-forming resin; 5-20% of low surface energy substances; 1-10% of photocatalytically active nanoparticles; 5-40% of hydrophobic nanoparticles and 20-60% of organic solvents % composition, and the preparation process is as follows: firstly modify the nanoparticles with fluorosilane to obtain hydrophobic nanoparticles, then weigh each component of the coating, mix, and then disperse at high speed for 2-4 hours to obtain the coating of the present invention . The paint can be applied to the surface of steel, aluminum alloy, plastic, composite materials and other substrates by brushing, spraying, etc., and will form a lotus leaf-shaped super-hydrophobic coating after drying. The resulting superhydrophobic coating can achieve superhydrophobic self-healing through UV irradiation after being polluted by organic pollutants or subjected to external mechanical wear, thus endowing the coating with excellent superhydrophobic durability and ensuring its long-term durability in outdoor environments. Use performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of new chemical materials, in particular to a composition of a photocatalytic self-repairing super-hydrophobic coating and a preparation method thereof. Background technique [0002] Superhydrophobic coatings have very unique properties and have potential application value in many fields (such as self-cleaning, anti-icing, anti-corrosion and anti-fouling, etc.). However, the durability of the existing superhydrophobic coatings is poor, and they are easy to lose superhydrophobic properties after being subjected to external friction, sunlight or oily pollutants, which limits the long-term use of superhydrophobic coatings in outdoor environments. Therefore, in recent years, more and more attention has been paid to the preparation of durable superhydrophobic coatings, and the best way to achieve the durability of superhydrophobic coatings is to endow the coatings with surface self-healing properti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/12C09D125/06C09D125/14C09D167/00C09D175/04C09D161/06C09D167/08C09D183/08C09D183/07C09D183/06C09D7/12
Inventor 周树学陈坤林武利民
Owner FUDAN UNIV
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