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Method for forming coating of titanium dioxide on article surface

A technology for titanium dioxide and articles, which is applied in the field of forming self-cleaning coatings on the surfaces of articles, can solve problems such as complex processes, and achieve the effects of reducing requirements and accelerating adhesion and curing.

Inactive Publication Date: 2006-04-12
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen from the above prior art that the existing method of coating titanium dioxide on the surface of the article is relatively complicated, and it requires a high-temperature curing process or the assistance of an adhesive to fix the coating on the surface of the article.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Preparation of sol mixture

[0042] The sol mixture or nanosol is obtained by mixing titanium tetraisopropoxide (trade name "Aldrich", purity 97%) with absolute ethanol (trade name "Riedel", purity 99.8%) with a pH value between 1 and 2 obtained by mixing. The mixture was stirred vigorously for 10 minutes before coating.

[0043] 2. Padding treatment

[0044] Dry a 10×10 cm knitted cotton substrate at 100°C for 30 minutes, then immerse it in the nano solution for 30 seconds, and then press it with an automatic padding machine at a pressure of 2.75kg / cm 2 . The crimped substrate was dried in a preheated oven at 80°C for 10 minutes to remove ethanol, and finally cured in a preheated curing oven at 100°C. A drying step before coating and a curing step after coating are optional.

Embodiment 2

[0046] 1. Preparation of sol mixture

[0047] The nanosol was prepared by mixing titanium tetraisopropoxide with acidic water containing nitric acid at room temperature. The mixture was stirred vigorously for 18 hours before coating.

[0048] 2. Padding treatment

[0049] The fabric substrate is cleaned, dried and immersed in the nano-sol for 1 minute, then with an automatic padding machine at 2.75kg / cm 2The clamping force is clamping. The padded substrate was rinsed with sodium carbonate solution (1%), then rinsed with water, then dried in a preheated oven at 80°C for 10 minutes to remove ethanol and finally dried in a preheated curing oven. Cured at 100°C. A drying step before coating and a curing step after coating are optional.

[0050] Fabrics treated by the method of the present invention have the following characteristics.

[0051] 1. Antibacterial activity

[0052] Antimicrobial activity of treated fabrics can be quantitatively assessed by an antimicrobial activ...

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Abstract

A process for preparing a coated TiO2 layer on an object includes such steps as proportionally mixing the precursor of TiO2 with an acidic solvent to obtain a sol mixture, and immersing the object (fabric) in it to form a coated TiO2 layer for obtaining the antibacterial and self-cleaning functions.

Description

technical field [0001] The invention relates to a surface treatment method, especially a method for forming a self-cleaning coating on the surface of an article, which can easily and quickly obtain the surface characteristics of self-cleaning for articles such as fabrics. Background technique [0002] With the development of industry, the human living environment is increasingly polluted. From the air we breathe to the limited water resources, they are inevitably endangered, so that various bacteria that threaten human health can survive and multiply. The semiconductor oxide photocatalytic technology developed in recent years has made great progress in inhibiting bacterial reproduction. It is well known that titanium dioxide has high activity and good stability, and is the most promising photocatalyst which is harmless to human body. In addition, titanium dioxide nanoparticles have the properties of filtering ultraviolet rays, self-cleaning, antibacterial and deodorizing. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24B05D1/18B05D3/00B05D5/00D06M11/46
Inventor 忻浩忠戴炜烈
Owner THE HONG KONG POLYTECHNIC UNIV
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