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Super-biparental self-cleaning coating material and preparation method thereof

A self-cleaning coating and self-cleaning technology, applied in the direction of coating, can solve the problems of easy chalking of self-cleaning coatings, low self-cleaning efficiency of coatings, shortened service life of coatings, etc., and achieve outstanding self-cleaning characteristics , The effect of no loss of mechanical properties and good weather resistance of the coating

Active Publication Date: 2012-09-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the coating materials formed by the methods reported in these patents all have certain photocatalytic self-cleaning properties, the following problems still exist as self-cleaning coatings: (1) When using traditional polymers (except silicone resins) as adhesive Binder, due to the nano-TiO 2 Due to the photocatalytic decomposition of the particles, the self-cleaning coating is prone to pulverization, resulting in a shortened service life of the coating; (2) when using an inorganic binder or a silicone resin binder, nano-TiO 2 Particles are embedded by film-forming substances, the ability of photocatalytic decomposition of organic pollutants is reduced, and the self-cleaning efficiency of the coating is low; (3) although some patents report the super-hydrophilic properties of the coating, no super-amphiphile (super-amphiphile) is found. hydrophilic, super-oleophilic) self-cleaning coatings, and the super-amphiphilic properties of coatings are very helpful to improve the self-cleaning properties of coatings

Method used

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  • Super-biparental self-cleaning coating material and preparation method thereof
  • Super-biparental self-cleaning coating material and preparation method thereof
  • Super-biparental self-cleaning coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix tetraethyl orthosilicate with 100 parts of γ-glycidyloxypropyltrimethoxysilane (mass ratio: 95 / 5), 87.5 parts of absolute ethanol, and 45.0 parts of deionized water, and mix them in 0.24 parts of hydrochloric acid Under the action of catalysis, hydrolyze and condense at 70° C. for 3 hours to obtain siloxane oligomer (AI).

[0030] 45 parts of butyl acrylate, 45 parts of styrene, 10 parts of γ-(methacryloyloxy)propyltrimethoxysilane, 3 parts of γ-mercaptopropyltriethoxysilane, 40 parts of xylene, initiator (LUPEROX 575) 3 parts, the styrene-acrylic oligomer (B) was prepared by semi-continuous solution polymerization (polymerization temperature 120°C).

[0031] Stir and mix 12 parts of styrene-acrylic oligomer B, 12 parts of P251, and 36 parts of xylene, add an appropriate amount of zirconium beads (ball diameter 0.3mm), and disperse at high speed for 4 hours to obtain uniformly dispersed nano-TiO 2 slurry.

[0032] Take 90 parts of siloxane oligomer AI, 10 parts of...

Embodiment 2

[0034] Mix tetraethyl orthosilicate with 100 parts of vinyltrimethoxysilane (mass ratio: 95 / 5), 87.5 parts of absolute ethanol, and 45.0 parts of deionized water. The siloxane oligomer (AII) was obtained by hydrolyzing and condensing for 3 hours.

[0035] 90 parts of siloxane oligomer AII, 10 parts of styrene-acrylic oligomer B in embodiment 1, nanometer TiO in embodiment 1 2 Mix 3 parts of the slurry evenly to prepare the coating component A; before coating, add 10 parts of γ-aminopropyltriethoxysilane, and apply a film on the glass sheet by dip coating, and dry it at room temperature for one week. After the coating was placed under the summer sun, the water contact angle and cyclohexane contact angle of the coating decreased to 0° after 14 days. After the weather resistance test, the coating surface was free of powder, and the pencil hardness changed from 6H to 4H.

Embodiment 3

[0037] With 90 parts of 3074 silicone resins, 10 parts of styrene-acrylic oligomer B in embodiment 1, nanometer TiO in embodiment 1 2 Mix 7 parts of the slurry evenly to prepare coating component A; before coating, add 10 parts of γ-aminopropyltriethoxysilane, apply a film on a glass sheet by dip coating, dry at room temperature for one week, and apply After the coating was placed under the summer sun, the water contact angle and cyclohexane contact angle of the coating dropped to 0° after 15 days. After the weather resistance test, the coating surface was free from chalking, and the pencil hardness changed from 4H to 3H.

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Abstract

The invention belongs to the technical field of chemical materials, and in particular discloses a super-biparental self-cleaning coating material and a preparation method thereof. The coating material of the invention consists of nano TiO2 particles and organic-inorganic hybridized matrix and obtains super-biparental self-cleaning property through sunlight irradiation, wherein the content of the nano TiO2 particles is 0.5 to 10 percent, and the organic-inorganic hybridized matrix is formed by crosslinking and curing siloxane oligomer (A), phenylpropyl oligomer (B) with alkoxyl silicon group and amino silane (C) at the room temperature. The specific preparation method comprises the following steps: firstly preparing slurry from the nano TiO2 particles, then mixing the slurry, the components A and B, organic diluent and the like, adding C into the mixture, stirring the mixture evenly, then coating the mixture on the surface of a base material, drying the mixture at the room temperature,and irradiating the mixture for a period of time by sunlight to form the coating material with required properties. The coating material is suitable for large-area construction, has good weather resistance and remarkable self-cleaning property, and can be used as a self-cleaning coating on the surfaces of a building external wall, a bridge, an oil field and yard mechanical equipment, a guardrail,a glass curtain wall and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and relates to a super amphiphilic (super hydrophilic, super lipophilic) self-cleaning coating material suitable for outdoor use and a preparation method thereof. Background technique [0002] In recent years, self-cleaning coatings have received extensive attention. Currently, two types of self-cleaning coatings have been developed based on different self-cleaning principles. One is a super-hydrophobic (water contact angle > 150°) self-cleaning coating, which rolls away dust through water droplets to achieve a self-cleaning function similar to that of 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 char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/04C09D5/00
Inventor 周树学丁晓峰顾广新武利民
Owner FUDAN UNIV
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