Inorganic coating composition which can be cured at low temperature and a preparation method thereof

Abstract

The present invention relates to coating composition. And in particular, to an inorganic coating composition which can be cured at low temperature and a preparation method thereof. In order to solve the problems that the organic coating is harmful for the environment, the inorganic coating has bad flexibility, and the traditional ceramic coatings need heat and is inconvenient for curing in prior art, the present invention provide an inorganic coating composition which can be cured at low temperature and a preparation method thereof. The inorganic coating composition comprises the ingredient as below: 70-80 wt % of inorganic solution; 5-10 wt % of functional additives, which are potassium titanate, alumina, or a compound thereof; 10-20 wt % of inorganic pigment; 0.5-2.0 wt % of other functional additives. The said inorganic solution comprises the following ingredients: 30-40 wt % of organic alkoxy-silane, 15-20 wt % of organic solvent, and 25-30 wt % of silica sol. The inorganic coating composition is able to be cured at low temperature, the film formed by it has excellent flexibility, and the film will not release harmful organic gases, and is beneficial to the environmental.

What is claimed is: 
     
         1 - 11 . (canceled) 
     
     
         12 . An inorganic coating composition, wherein the inorganic coating composition comprises:
 70-80 wt % inorganic solution, wherein
 the inorganic solution comprises
 30-40 wt % organic alkoxy-silane, 
 15-20 wt % organic solvent, and 
 25-30 wt % silica sol. 
 
   
     
     
         13 . The inorganic coating composition of  claim 12 , wherein the inorganic coating composition further comprises:
 10-20 wt % inorganic pigment.   
     
     
         14 . The inorganic coating composition of  claim 12 , wherein the inorganic coating composition further comprises:
 a first functional additive that is 5-10% wt of the inorganic coating composition,   
     
     
         15 . The inorganic coating composition of  claim 12 , wherein the inorganic coating composition further comprises:
 an other functional additive that is 0.5-2.0 wt % of the inorganic coating composition.   
     
     
         16 . The inorganic coating composition of  claim 12 , wherein the inorganic coating composition further comprises:
 a first functional additive that is 5-10% wt of the inorganic coating composition, and   an other functional additive that is 0.5-2.0 wt % of the inorganic coating composition.   
     
     
         17 . The inorganic coating composition of  claim 12 , wherein
 the organic alkoxy-silane is represented by formula R 1   m Si(OR 2 ) 4-m , where R 1  and R 2  represent a substituted or non-substituted alkyl group or aryl group comprising 1-10 carbon atoms, and m is 0-3.   
     
     
         18 . The inorganic coating composition of  claim 17 , wherein
 R 1  or R 2  are at least one selected from the group including methyl, ethyl, phenyl, CF 3 CH 2 CH 2 , CF 3 (CF 2 ) 5 CH 2 CH 2 , and CF 3 (CF 2 ) 7 CH 2 CH 2 , and alternatively wherein   R 1  and R 2  are at least one of selected from the group including methyl, ethyl, phenyl, CF 3 CH 2 CH 2 , CF 3 (CF 2 ) 5 CH 2 CH 2 , and CF 3 (CF 2 ) 7 CH 2 CH 2 .   
     
     
         19 . The inorganic coating composition of  claim 12 , wherein
 the silica sol comprises 20-40 wt % silica (SiO 2 ) particles, a size of the silica particle is from nanometer-size to micron-size.   
     
     
         20 . The inorganic coating composition of  claim 14 , wherein the first functional additive comprises potassium titanate that is 3-5% wt of the inorganic coating composition. 
     
     
         21 . The inorganic coating composition of  claim 12 , wherein
 the organic alkoxy-silane is methyl trimethoxy silane, tetraethoxysilane, phenyl trimethoxy silane or a mixture thereof; and   the organic solvent is methanol, ethanol, isopropanol or a mixture thereof.   
     
     
         22 . The inorganic coating composition of  claim 12 , wherein ingredients of the inorganic coating composition are treated by ultrasonic waves. 
     
     
         23 . The inorganic coating composition of  claim 22 , wherein
 a frequency of the ultrasonic waves is greater than or equal to 20 KHz, and   the ingredients of the inorganic coating composition are treated by ultrasonic waves for 30-40 minutes.   
     
     
         24 . The inorganic coating composition of  claim 22 , wherein
 a mixture of organic alkoxy-silane and silica sol are treated with ultrasonic waves during a mixing and reacting step of the organic alkoxy-silane and the silica sol.   
     
     
         25 . The inorganic coating composition of  claim 12 , wherein the inorganic coating composition is curable at low temperature between 10-40 degrees Celsius. 
     
     
         26 . The method for preparing the inorganic coating composition of  claim 12 , wherein the method comprises the following steps:
 (1) preparing the inorganic solution: mixing the 30-40 wt % organic alkoxy-silane, with the 15-20 wt % organic solvent, and 25-30% silica sol; and stirring the mixture at 40-50 degrees Celsius for 5-10 minutes to get inorganic solution in sol state;   (2) preparing the inorganic coating mixture: putting 70-80 wt % the inorganic solution generated in step (1), 5-10 wt % functional additives, 10-20 wt % inorganic pigment, and 0.5-2.0 wt % other functional additives together; and stirring the mixture to get the inorganic coating mixture;   (3) placing the inorganic coating mixture generated in step (2) in a homogenizer; and stirring it at a speed sufficient for homogenization for 1-2 hours to make the particles homogenized; and   (4) filtering the homogenized matter generated in step (3) pass through a 325-1000 mesh net to remove bigger particles; and obtaining the inorganic coating composition which is curable at a temperature between 10-40 degrees Celsius.