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Method for enhancing weather resistance of surface of organic material

A technology of organic materials and weather resistance, which is applied in the field of composite coatings, can solve the problems of reducing weather resistance and weakening the protective effect of surface photocatalytic film, and achieves the effect of simple method, good effect and good weather resistance

Active Publication Date: 2014-06-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when titanium dioxide is directly coated on the surface of the organic substrate, on the one hand, there is a problem of the binding force between the photocatalytic film and the substrate material (the hydrophilicity of the titanium dioxide film and the hydrophobicity of the organic substrate make it difficult to form a strong binding force), On the other hand, the photocatalytic effect of the surface titanium dioxide film may cause some organic substrate materials to be oxidized and reduce the weather resistance, resulting in the weakening of the protective effect of the surface photocatalytic film.

Method used

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  • Method for enhancing weather resistance of surface of organic material
  • Method for enhancing weather resistance of surface of organic material
  • Method for enhancing weather resistance of surface of organic material

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preparation example Construction

[0015] 1. The preparation of coatings, including the preparation of organic-inorganic hybrid intermediate layer and pure titanium dioxide coating.

[0016] (1) At room temperature, use a small amount of glacial acetic acid as a catalyst in a reaction vessel, add the two raw materials at a volume ratio of ethanol: ethyl orthosilicate = 2-13: 60-100, and stir evenly. After reacting for about 3-6 hours, slowly add γ-aminopropyltriethoxysilane according to the volume ratio of ethanol:γ-aminopropyltriethoxysilane=2-13:1-4, After the solution is fully mixed, it is continuously stirred for about 3-10 hours to fully hydrolyze the raw materials, and the sol is aged for about 12-36 hours.

[0017] (2) Preparation of pure titanium dioxide coating: hydrolyze titanium alkoxide (such as tetraisopropyl titanate, tetrabutyl titanate) under the condition of acidic pH7 to obtain a uniform and transparent sol, The titanium dioxide coating is prepared by adjusting the pH value of the sol to 1-5 ...

Embodiment 1

[0021] Embodiment 1: the preparation of pure titanium dioxide coating

[0022] Under the condition of acidic pH<5, tetraisopropyl titanate was hydrolyzed to obtain a uniform and transparent sol, and the pH value of the sol was adjusted to 3.5 by dialysis to prepare a titanium dioxide coating.

Embodiment 2

[0023] Embodiment 2: Preparation of organic-inorganic hybrid intermediate layer

[0024] At room temperature, add 50mL ethanol, 500mL tetraethyl orthosilicate (TEOS) and 5mL catalyst glacial acetic acid to the beaker successively, and stir evenly. After the water generated by the esterification reaction of ethanol and glacial acetic acid promotes the initial hydrolysis of TEOS for about 5 hours, then slowly add 50mL of γaminopropyltriethoxysilane, and after the solution is fully mixed, keep stirring for about 5 hours to fully hydrolyze the raw materials. Then the stirring was stopped, and the sol was aged for about 24 h.

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Abstract

The invention discloses a method for enhancing the weather resistance of the surfaces of organic materials. The organic and inorganic hybridization intermediate layer / inorganic nanometer titanium dioxide surface layer composite protective coating is prepared through the following steps to enhance the surface weather resistance of the organic material: firstly coating an organic and inorganic hybridization intermediate layer on the surface of an organic material substrate; and then coating an inorganic nanometer titanium dioxide surface layer on the surface of the organic and inorganic hybridization intermediate layer. According to the invention, a good combination of the hydrophobic group of the surface of an organic substrate material and the hydrophilic group of a surface inorganic titanium dioxide film is realized by utilizing the amphiphilic structural characteristic of the organic and inorganic hybridization intermediate protective layer; the radiation of ultraviolet on an organic bottom layer is reduced by utilizing the ultraviolet absorption effect of the surface titanium dioxide inorganic protective film, so that the weather resistant property of the organic substrate material is enhanced; and the air is purified and the cleanness of a material surface is maintained by utilizing the photocatalysis effect and optical self-cleaning characteristic of a surface film layer. The composite coating film can be widely applied to the surfaces of various organic materials; and the method disclosed by the invention has the advantages of simplicity, easiness for operation and good effect.

Description

technical field [0001] The invention belongs to the field of composite coatings, and in particular relates to a method for improving the surface weather resistance of organic materials. Background technique [0002] With the development of material preparation technology, various organic composite materials such as plastics and rubber are more and more widely used in buildings, highways, bridges, transportation vehicles, marine engineering facilities, etc. due to their light weight and good toughness. in the field of construction. Metal materials such as iron and steel are another common outdoor building material, but because of its easy to rust, it is often necessary to coat various organic protective coatings (paints) on its surface to improve its anti-corrosion performance; in addition, the surface of concrete exterior walls is usually also Apply a layer of organic exterior wall paint to improve the decorative performance of buildings. Due to the long-term exposure of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D5/00B05D7/00C09D183/08C09D1/00
Inventor 戴文新王小祥陈旬付贤智刘平郑华荣丁正新王绪绪
Owner FUZHOU UNIV