# Patent

## Title
Method of making composite coating and product formed with the composite coating

## Abstract

A method of making a composite coating includes the steps of: adding a proper quantity of inorganic metal salt into an organic dissolvent to form a first mixed solution and then stirring the first mixed solution for 30-60 minutes; adding a proper quantity of SiO2 precursor into the first mixed solution to form a second mixed solution and then stirring the second mixed solution for 30-60 minutes; adding a proper quantity of catalyzer and water into the second mixed solution for being reacted with each other so as to form a coating solution via being stirred for 4-8 hours; and putting the coating solution under the room temperature for 24 hours so as to obtain the composite coating. A product formed with the foregoing composite coating includes a base body and a layer of composite protective film formed by the composite coating on surfaces of the base body.

## Background
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a coating and uses thereof, and more particularly to a method of making a composite coating and a product formed with the composite coating.
2. The Related Art
At present, a sol-gel method is widely applied to manufacture SiO2 coating, TiO2 coating and ZrO2 coating, etc. The SiO2 coating, the TiO2 coating and the ZrO2 coating are generally used to be coated onto surfaces of a base body of a product so as to form SiO2 films, TiO2 films and ZrO2 films respectively. The films can protect the product from being damaged. However, the SiO2 coating, the TiO2 coating and the ZrO2 coating manufactured by the sol-gel method each have only one single function, and accordingly, the SiO2 film, the TiO2 film and the ZrO2 film respectively formed by the SiO2 coating, the TiO2 coating and the ZrO2 coating each have only one corresponding function so that the foregoing films can not fully protect the product. Therefore, a method of making a composite coating is required to manufacture the composite coating having many kinds of composite functions.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method of making a composite coating and a product formed with the composite coating. The method is described hereinafter. Firstly, a proper quantity of inorganic metal salt is added into an organic dissolvent to form a first mixed solution and then the first mixed solution is stirred for 30-60 minutes. Secondly, a proper quantity of SiO2 precursor is added into the first mixed solution to form a second mixed solution and then the second mixed solution is stirred for 30-60 minutes. Next, a proper quantity of catalyzer and water is added into the second mixed solution for being reacted with each other so as to form a coating solution via being stirred for 4-8 hours. Lastly, the coating solution is subjected to the room temperature for 24 hours so as to obtain the composite coating. The product formed with the foregoing composite coating includes a base body and a layer of composite protective film formed on surfaces of the base body, wherein the composite protective film is formed by coating the composite coating onto the surfaces of the base body firstly and then putting the base body under the room temperature or a heating environment of lower than 100 degrees centigrade for a period of time to make the composite coating dried.
As described above, the above-mentioned method according to the present invention can manufacture the composite coating having many kinds of composite functions, and accordingly, the composite protective film of the product formed by the composite coating has many kinds of composite functions so as to further protect the product fully.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A method of making a composite coating according to the present invention is described hereinafter.
Firstly, a proper quantity of inorganic metal salt is added into an organic dissolvent to form a first mixed solution and then the first mixed solution is stirred for 30-60 minutes, wherein the organic dissolvent is any one of or a mixture of an ethanol dissolvent and an isopropanol dissolvent. The inorganic metal salt is any one of or a mixture of at least two selected from a TiO2 precursor, a Al2O3 precursor, a ZrO2 precursor and a ZnO precursor, wherein the TiO2 precursor is any one of or a mixture of Ti(OC2H5)4 and Ti(OCH(CH3)2)4, the Al2O3 precursor is any one of or a mixture of Al(OC3H7)3 and Al[OCH(CH3)C2H5]3, the ZrO2 precursor is any one of or a mixture of at least two selected from Zr(OC2H5)4, Zr(OCH2CH2CH3)4 and Zr[OC(CH3)3]4, and the ZnO precursor is Zn(CH3COO)2.2H2O.
Secondly, a proper quantity of SiO2 precursor is added into the first mixed solution to form a second mixed solution and then the second mixed solution is stirred for 30-60 minutes, wherein the SiO2 precursor is any one of or a mixture of at least two selected from Si(OC2H5)4, C2H5Si(OC2H5)3, C2H5Si(OCH3)3, CH3Si(OC2H5)3, CH3Si(OCH3)3, H2C═CHSi(OC2H5)3 and H2C═CHSi(OCH3)3.
Next, a proper quantity of catalyzer and water is added into the second mixed solution for being reacted with each other so as to form a coating solution via being stirred for 4-8 hours, wherein the water is deionized water and the catalyzer is 10%-40% consistency of acidic catalyzer or alkaline catalyzer. The acidic catalyzer is any one of or a mixture of at least two selected from HCl, CH3COOH and HNO3, and the alkaline catalyzer is NH4OH.
Lastly, the coating solution is subjected to the room temperature for 24 hours so as to obtain the composite coating having a steady chemical property, wherein the composite coating is any one of SiO2/TiO2, SiO2/ZrO2, SiO2/Al2O3, SiO2/ZnO, SiO2/TiO2/Al2O3, SiO2/TiO2/ZnO, SiO2/TiO2/ZrO2, SiO2/Al2O3/ZnO, SiO2/Al2O3/ZrO2, SiO2/ZrO2/ZnO, SiO2/TiO2/Al2O3/ZrO2, SiO2/TiO2/Al2O3/ZnO, SiO2/TiO2/ZrO2/ZnO and SiO2/TiO2/Al2O3/ZrO2/ZnO, and has many kinds of composite functions because TiO2 is a kind of photocatalyst material, ZnO has an antiseptic function, and SiO2, ZrO2 and Al2O3 each have a resisting scrape and wear function.
A product formed with the foregoing composite coating includes a base body and composite protective films formed on surfaces of the base body, wherein the product having the composite protective films thereon is formed by coating the composite coating onto the surfaces of the base body firstly and then putting the base body under the room temperature or a heating environment of lower than 100 degrees centigrade for a period of time to make the composite coating dried for forming the composite protective films on the surfaces of the base body. Furthermore, the composite protective film formed by the composite coating of the present invention has many kinds of composite functions for further protecting the product fully.
Two embodiments, namely a method of making SiO2/Al2O3 composite coating and a method of making SiO2/TiO2/Al2O3 composite coating, are introduced for describing the above-mentioned method in detail.
The method of making the SiO2/Al2O3 composite coating is described hereinafter. Firstly, 2 ml Al(OC3H7)3 is added into 300 ml ethanol dissolvent to form a first mixed solution and then the first mixed solution is stirred for 30 minutes under the room temperature. Secondly, 50 ml Si(OC2H5)4, 50 ml C2H5Si(OC2H5)3 and 50 ml H2C═CHSi(OCH3)3 are added into the first mixed solution to form a second mixed solution and then the second mixed solution is stirred for 30 minutes under the room temperature. Next, 10 ml 10% consistency of HCl and 15 ml deionized water are added into the second mixed solution for being reacted with each other so as to form a coating solution via being stirred for 4 hours. Lastly, the coating solution is subjected to the room temperature for 24 hours so as to obtain the SiO2/Al2O3 composite coating having a steady chemical property and a resisting scrape and wear function. When a product is formed with the SiO2/Al2O3 composite coating, the SiO2/Al2O3 composite coating is firstly coated onto surfaces of a base body of the product, and then the base body is subjected to the room temperature for 30 minutes to make the SiO2/Al2O3 composite coating dried naturally so as to form SiO2/Al2O3 composite protective films on the surfaces of the base body, wherein the SiO2/Al2O3 composite protective film of the product has a resisting scrape and wear function.
The method of making the SiO2/TiO2/Al2O3 composite coating is described hereinafter. Firstly, 1.5 ml Al[OCH(CH3)C2H5]3 and 1.5 ml Ti(OCH(CH3)2)4 are added into 300 ml ethanol dissolvent to form a first mixed solution and then the first mixed solution is stirred for 30 minutes under the room temperature. Secondly, 50 ml Si(OC2H5)4, 50 ml H2C═CHSi(OC2H5)3 and 50 ml H2C═CHSi(OCH3)3 are added into the first mixed solution to form a second mixed solution and then the second mixed solution is stirred for 30 minutes under the room temperature. Next, 10 ml 10% consistency of HCl and 15 ml deionized water are added into the second mixed solution for being reacted with each other so as to form a coating solution via being stirred for 4 hours. Lastly, the coating solution is subjected to the room temperature for 24 hours so as to obtain the SiO2/TiO2/Al2O3 composite coating having a steady chemical property, a resisting scrape and wear function and further capable of be used as a kind of photocatalyst material. When a product is formed with the SiO2/TiO2/Al2O3 composite coating, the SiO2/TiO2/Al2O3 composite coating is firstly coated onto surfaces of a base body of the product, and then the base body is subjected to a heating environment of 50 degrees centigrade for 3 minutes to make the SiO2/TiO2/Al2O3 composite coating dried so as to form SiO2/TiO2/Al2O3 composite protective films on the surfaces of the base body, wherein the SiO2/TiO2/Al2O3 composite protective film of the product has a resisting scrape and wear function and further can play a part of photocatalyst material.
As described above, the above-mentioned method according to the present invention can manufacture the composite coating having many kinds of composite functions, and accordingly, the composite protective film of the product formed by the composite coating has many kinds of composite functions so as to further protect the product fully.

## Claims

1. A method of making a composite coating, comprising the steps of:
adding a quantity of inorganic metal salt into an organic dissolvent to form a first mixed solution and then stirring the first mixed solution for 30-60 minutes;
adding a quantity of SiO2 precursor into the first mixed solution to form a second mixed solution and then stirring the second mixed solution for 30-60 minutes;
adding a quantity of catalyzer and water into the second mixed solution for being reacted with each other so as to form a coating solution via being stirred for 4-8 hours; and
putting the coating solution under the room temperature for 24 hours so as to obtain the composite coating.

2. The method as claimed in claim 1, wherein the inorganic metal salt is any one of or a mixture of at least two selected from a TiO2 precursor, a Al2O3 precursor, a ZrO2 precursor and a ZnO precursor.

3. The method as claimed in claim 2, wherein the TiO2 precursor is any one of or a mixture of Ti(OC2H5)4 and Ti(OCH(CH3)2)4, the Al2O3 precursor is any one of or a mixture of Al(OC3H7)3 and Al[OCH(CH3)C2H5]3, the ZrO2 precursor is any one of or a mixture of at least two selected from Zr(OC2H5)4, Zr(OCH2CH2CH3)4 and Zr[OC(CH3)3]4, and the ZnO precursor is Zn(CH3COO)2.2H2O.

4. The method as claimed in claim 1, wherein the organic dissolvent is any one of or a mixture of an ethanol dissolvent and an isopropanol dissolvent.

5. The method as claimed in claim 1, wherein the SiO2 precursor is any one of or a mixture of at least two selected from Si(OC2H5)4, C2H5Si(OC2H5)3, C2H5Si(OCH3)3, CH3Si(OC2H5)3, CH3Si(OCH3)3, H2C═CHSi(OC2H5)3 and H2C═CHSi(OCH3)3.

6. The method as claimed in claim 1, wherein the water is deionized water.

7. The method as claimed in claim 1, wherein the catalyzer is 10%-40% consistency of acidic catalyzer.

8. The method as claimed in claim 7, wherein the acidic catalyzer is any one of or a mixture of at least two selected from HCl, CH3COOH and HNO3.

9. The method as claimed in claim 1, wherein the catalyzer is 10%-40% consistency of alkaline catalyzer.

10. The method as claimed in claim 9, wherein the alkaline catalyzer is NH4OH.