Platelet-Type Zirconium Phosphate and Method for Preparing Same

Abstract

A platelet-type zirconium phosphate, which has a P—OH group contained in a structure thereof, and has a crystalline peak at a 2θ value of 11.6±2 degrees and no crystalline peak at a 2θ value of less than 11.6±2 degrees in X-ray diffraction analysis, is provided. The platelet-type zirconium phosphate has a platelet-type structure and can be uniformly dispersed at a nanoscale level in a coating film to exhibit excellent surface gloss and barrier capability. Also, the platelet-type zirconium phosphate can exhibit excellent corrosion resistance due to the presence of the P—OH group on a surface thereof, and can be dispersed not only in an aqueous solution but also in an organic solvent.

1 . A platelet-type zirconium phosphate containing a P—OH group in a structure thereof, and having a crystalline peak at a 2θ value of 11.6±2 degrees and no crystalline peak at a 2θ value of less than 11.6±2 degrees in X-ray diffraction analysis. 
     
     
         2 . The platelet-type zirconium phosphate of  claim 1 , which has a structural unit in which oxygen atoms in a tetrahedron composed of PO 3 (OH) are bound respectively to three zirconium atoms. 
     
     
         3 . The platelet-type zirconium phosphate of  claim 1 , which has a mass loss of less than 5% at 400° C., as measured in thermogravimetric analysis (TGA). 
     
     
         4 . The platelet-type zirconium phosphate of  claim 1 , wherein the platelet-type zirconium phosphate has a polygonal particle shape. 
     
     
         5 - 12 . (canceled) 
     
     
         13 . A metal material, comprising:
 a substrate; and   a resin coating layer formed on the substrate and including a platelet-type zirconium phosphate which has a P—OH group contained in a structure thereof, and has a crystalline peak at a 2θ value of 11.6±2 degrees and no crystalline peak at a 2θ value of less than 11.6±2 degrees in X-ray diffraction analysis.   
     
     
         14 . The metal material of  claim 13 , wherein the resin coating layer is formed by coating a substrate with a resin composition including a platelet-type zirconium phosphate and by UV-curing or thermally curing the resin composition. 
     
     
         15 . The metal material of  claim 13 , wherein the resin is a radiation-curable resin, a solvent-type resin, or a water-soluble resin.