Patent ID: 8304356

Claim:
A method for manufacturing a porcelain stain, comprising: a Step 1 of forming aluminosilicate glass A having a sintering temperature of 760-820 ° C. and a linear thermal expansion coefficient of 6.0×10 −6 K −1 −9.0×10 −6 K −1 in a range of 25-500 ° C. by fusing a mixed raw material at least 1200 ° C. or higher, wherein the mixed raw material comprises the following components: SiO 2 : 55.0-75.0% by weight, B 2 O 3 : 5.0-20.0% by weight, Al 2 O 3 : 5.0-15.0% by weight, Li 2 O : 0.5-1.5% by weight, Na 2 O : 3.0-8.0% by weight, K 2 O : 3.0-8.0% by weight, CaO : 1.0-5.0% by weight, MgO : 0.1-1.0% by weight, Sb 2 O 3 : 0.1-1.0% by weight; a Step 2 of obtaining a glass lump by cooling a melt of the aluminosilicate glass A, and drying and grinding the glass lump to form glass frit having an average particle size of 3-8 μm; a Step 3 of forming aluminosilicate glass B having a sintering temperature of 800-860 ° C. which is different from by 40° C. or more than that of the aluminosilicate glass A and a linear thermal expansion coefficient of 6.0×10 −6 K −1 −9.0×10 −6 K −1 in a range of 25-500 ° C. by fusing another mixed raw material at least 1200 ° C. or higher, wherein the mixed raw material comprises the following components: SiO 2 : 55.0-75.0% by weight, B 2 O 3 : 5.0-20.0% by weight, Al 2 O 3 : 5.0-15.0% by weight, Li 2 O : 0.5-1.5% by weight, Na 2 O : 3.0-8.0% by weight, K 2 O : 3.0-8.0% by weight, CaO : 1.0-5.0% by weight, MgO : 0.1-1.0% by weight, Sb 2 O 3 : 0.1-1.0% by weight; a Step 4 of obtaining a glass lump by cooling a melt of the aluminosilicate glass B, drying and grinding the glass lump to form glass frit having an average particle size of 3-8 μm; and a Step 5 of mixing the glass frit obtained in Step 2, the glass frit obtained in Step 4 and a coloring material to manufacture a porcelain stain having a sintering temperature of 760-860 ° C. and a linear thermal expansion coefficient of 6.0×10 −6 K −1 −9.0×10 −6 K −1 in a range of 25-500 ° C.