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High-durability super-hydrophobic self-cleaning coating material and preparation method thereof

A self-cleaning coating, super-hydrophobic technology, applied in coatings, antifouling/underwater coatings, anti-corrosion coatings, etc., to achieve the effect of easy application, mild conditions, and outstanding self-cleaning properties

Inactive Publication Date: 2013-07-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this method are the selectivity to the substrate being etched and the need for chemical modification
Patent CN101307210A reports a super-hydrophobic water fluorosilane coating containing nanoparticles, but in the preparation process of this patent, inorganic porogenic carbonate compounds must be added, and inorganic acids are required to regulate the pH of the system between 7-11 The preparation process is complicated and the controllability is poor
Although the surface of the material formed by the methods reported in these patents has superhydrophobic properties, there are still two problems in actual use: (1) the preparation method is complicated, often requires special equipment, the process is cumbersome, and it is selective to the substrate. It is not suitable for the preparation of superhydrophobic coatings in large areas; (2) the superhydrophobic durability of the coating is poor, resulting in a short life of the self-cleaning function of the coating

Method used

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  • High-durability super-hydrophobic self-cleaning coating material and preparation method thereof
  • High-durability super-hydrophobic self-cleaning coating material and preparation method thereof
  • High-durability super-hydrophobic self-cleaning coating material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 0.52 parts of dispersant BYK180, 0.0035 parts of leveling agent BYK-333 and 0.0035 parts of defoamer A-141 into 250 parts of butyl acetate, shear and stir for 10 minutes to disperse; 56.5 parts of fluorine-containing hydroxypropyl silicone oil (molecular weight 8000g / mol, double-ended hydroxypropyl) and 35 parts of TiO 2 Nanoparticles (P25) were added to the above dispersion, stirred and dispersed at a speed of 1000r / min for 2 hours to obtain a nanocomposite coating; before coating, 8.5 parts of hydrogen-containing silicone oil (molecular weight 1200g / mol, double-ended hydrogen-containing ) and a small amount of platinum complex catalyst, stirred evenly, and coated on the tinplate by spraying, after curing and drying at room temperature, a super-hydrophobic coating was obtained, and the thickness of the coating was 10 μm. SEM observation shows that the coating surface has a micro-nano composite structure (see attached figure 1 ), the coating has a water contact an...

Embodiment 2

[0031] Add 0.5 parts of dispersant BYK182, 0.002 parts of leveling agent BYK-300 and 0.002 parts of defoamer A-530 to 200 parts of xylene, shear and stir for 10 minutes to disperse; 69.2 parts of fluorinated vinyl silicone oil (molecular weight 6000g / mol, double-terminal vinyl) and 20 parts of ZnS nanoparticles were added to the above dispersion liquid, stirred and dispersed at a speed of 1000r / min for 2 hours to obtain a nanocomposite coating; before coating, 10.8 parts of hydrogen-containing fluorine were added Silicone oil (molecular weight 1800g / mol, double-terminal hydrogen-containing) and a small amount of methylvinylsiloxane coordination platinum catalyst are used to paint the film on the wood board by brushing, and after curing and drying at room temperature, a super-hydrophobic coating is obtained. The coating thickness is 95 μm, the coating water contact angle is 159.3°, and the rolling angle is 1.1°.

Embodiment 3

[0033] Add 0.4 parts of dispersant BYK145, 0.001 parts of leveling agent BYK-306 and 0.001 parts of defoamer A-065 to 200 parts of xylene, shear and stir for 10 minutes to disperse; / mol, double-ended vinyl) and 20 parts of SnO 2 Nanoparticles were added to the above dispersion, stirred and dispersed at a speed of 1000r / min for 2 hours to obtain a nanocomposite coating; Methylvinyl siloxane coordination platinum catalyst is used to coat the film on the glass plate by dip coating. After curing and drying at room temperature, a superhydrophobic coating is obtained. The thickness of the coating is 1 μm, and the water contact angle of the coating is 169.3°. Roll angle 0.5°.

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Abstract

The invention belongs to the technical field of a new chemical material, and in particular relates to a high-durability super-hydrophobic self-cleaning coating material and a preparation method thereof. The coating material of the invention is prepared by curing and drying nanoparticles with photo-catalytic activity, a low-surface-free-energy polymer and a cross-linking agent at the room temperature, wherein the low-surface-free-energy polymer consists of one or more of polysiloxane fluoride, dimethyl silicone polymer and polyphenylene methyl siloxane, which contain active groups, such as hydroxyl alkoxy group, carbon-carbon double bond, silanol group, siloxy group, and the like; the cross-linking agent is hydrogen-containing silicone oil or aminosilane; and the mass content of the photo-catalytic nanoparticles in the coating ranges from 10 to 60 percent. The coating is formed into a micro-nanostructure by nanoparticle self-organization; a super-hydrophobic self-cleaning coating with lotus effect is prepared from the coating and a cross-linked filming matrix with low surface energy; the persistence of a lotus-shaped super-hydrophobic characteristic of the coating is realized by using the photo-catalytic decomposition characteristic of an organic pollutant for the nanoparticles; and thus the material is suitable for large-area construction and has high weathering resistance andprominent self-cleaning characteristic.

Description

technical field [0001] The invention belongs to the technical field of new chemical materials, and in particular relates to a long-durability superhydrophobic self-cleaning coating and a preparation method thereof. Background technique [0002] In recent years, self-cleaning coatings have received extensive attention. The super-hydrophobic (water contact angle > 150°) self-cleaning coating removes dust by rolling water droplets to achieve a self-cleaning function similar to lotus leaves. However, there are many kinds of pollutants in the actual air environment, including hydrophilic dust pollutants, lipophilic organic pollutants, solid pollutants, liquid pollutants, and a mixture of various pollutants. , the existing super-hydrophobic coating cannot effectively remove all pollutants with different characteristics, resulting in the loss of super-hydrophobic properties on the coating surface due to the continuous accumulation of pollutants in the actual use process. In ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/08C09D183/04C09D183/06C09D183/07C09D7/12C09D5/00C09D5/16C09D5/08
Inventor 周树学丁晓峰武利民顾广新
Owner FUDAN UNIV
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