Highly bright and white ceramic product glaze and preparation process thereof

Abstract

The invention discloses a high-brightness white ceramic product glaze and a preparation process thereof. The high-brightness white ceramic product glaze is prepared from titanium dioxide, tin oxide, aluminum oxide, high-brightness white albite, kaolin, calcite, zirconium silicate, cooked talcum powder and a modifier. The preparation process of the high-brightness and high-white ceramic glaze mainly comprises the following steps: melting part of the raw materials, preserving heat, slowly cooling to obtain a frit, ensuring the uniformity and glossiness of the glaze on a green body, ball-milling the frit and the remaining raw materials, stirring, sieving, and adjusting the water content. Phosphate ions and borate ions are released through high-temperature decomposition of SHMP and sodium borate in the modifier, and react with metal ions in the glaze to form a specific crystal structure, so that the refractive index and glossiness of the glaze are changed, and the glaze surface is brighter and more transparent.

Description

Technical Field

[0001] The present invention belongs to the technical field of ceramic glazes, and relates to a glaze for high-brightness white ceramic products and a preparation process thereof. Background Art

[0002] With the continuous improvement of people's requirements for the artistic, personalized, and environmental protection of ceramic products in modern society, and the development of the diversification of local, fashionable, and humanistic decoration styles, ceramic glaze decoration has become an important means to save energy, reduce costs, improve product grades, increase added value, and enhance market competitiveness. The glaze layer can well improve the surface performance of ceramics. The glaze layer can make the ceramic surface smooth, while increasing the mechanical strength of ceramic products, reducing the porosity of the ceramic surface, and improving the surface chemical corrosion resistance, especially can beautify the appearance of products.

[0003] Preparing a high-brightness white glaze requires considering many factors. For example: 1) Formulation problem: The components and proportions in the glaze formulation may be incorrect, resulting in the loss of transparency and whiteness of the glaze. For example, when adding pigments or color developers, using inappropriate materials or excessive pigments will make the glaze not white. 2) Firing temperature problem: The temperature control during the firing process of the glaze may be inaccurate. Too high or too low firing temperature may affect the color and texture of the glaze. Too high temperature may cause bubbles or color change in the glaze, while too low temperature may cause incomplete melting or opacity of the glaze. 3) Firing time problem: Too short firing time may cause the glaze not to melt sufficiently, thus affecting transparency and whiteness. 4) Impurity problem: There may be impure impurities in the glaze, such as metal ions, impurity particles, etc., which will affect the color and transparency of the glaze. 5) Anti-oxidation problem: In some specific ceramic glazes, anti-oxidation performance is very important. Ceramic glazes often need to have a certain anti-oxidation performance to prevent problems such as oxidation, decomposition, or formation of bubbles caused by the reaction of the glaze with oxygen. Summary of the Invention

[0004] The purpose of the present invention is to provide a glaze for high-brightness white ceramic products and a preparation process thereof.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A glaze for high-brightness white ceramic products is composed of the following raw materials in parts by weight:

[0007] 16 - 20 parts of titanium dioxide, 15 - 22 parts of tin oxide, 5 - 10 parts of alumina, 8 - 12 parts of high-brightness albite, 6 - 12 parts of kaolin, 4 - 10 parts of calcite, 10 - 25 parts of zirconium silicate, 15 - 18 parts of calcined talc powder, and 3 - 5 parts of modifier.

[0008] As a preferred technical solution of the present invention, the modifier is sodium hexametaphosphate and sodium borate with a mass ratio of 4-6:3.

[0009] Sodium hexametaphosphate (SHMP): SHMP is mainly used as a dispersant and anti-settling agent in the glaze. It can help fine particles disperse evenly and maintain stability, preventing particle precipitation in the glaze system. SHMP also has the function of inhibiting crystal growth and improving the gloss of the glaze, making the glaze surface more bright and transparent.

[0010] A preparation process of a high-brightness white ceramic product glaze is as follows:

[0011] M1: Weigh the raw materials according to the parts by weight of the raw materials of the high-brightness white ceramic product glaze.

[0012] M2: Mix the modifier, titanium dioxide, tin oxide, alumina, high-brightness albite, and zirconium silicate in proportion and melt them, keep them warm, and then slowly cool them to room temperature to obtain frit.

[0013] During the sintering process, the modifier decomposes to release phosphate ions and borate ions, which react with metal ions in the glaze to form a specific crystal structure, which can change the refractive index and gloss of the glaze, making the glaze surface more bright and transparent; at the same time, sodium borate can form a glass structure in the glaze, which has good transparency and high refractive index, making the glaze more transparent and shiny, strengthening the high-brightness white effect.

[0014] M3: Mix kaolin, calcite, calcined talc powder and frit to obtain mixture a1, and then add a1, water and grinding balls to a ball mill according to proportion for ball milling and pulverizing, and sieving to obtain glaze slurry.

[0015] M4: After adjusting the water content of the glaze slurry to 40%-50%, a high-brightness white ceramic product glaze is obtained.

[0016] As a preferred technical solution of the present invention, the melting temperature is 1200-1300 °C, the melting time is 2-2.5 h, the heat preservation time is 3-5 h, and the slow cooling rate is 10-20 °C / min.

[0017] As a preferred technical solution of the present invention, the mass ratio of a1, water and grinding balls is 3:2-1:4-6.

[0018] As a preferred technical solution of the present invention, the ball milling time is 8-10 h, and the ball milling speed is 600-750 rpm.

[0019] As a preferred technical solution of the present invention, the sieving mesh number is 200-300 meshes.

[0020] Application of a high-brightness white glaze for ceramic products. The high-brightness white glaze for ceramic products can be applied to tiles, toilets or washbasins. The high-brightness white glaze for ceramic products is evenly coated on a ceramic blank, dried, fired at a high temperature, and finally polished to obtain high-brightness white tiles.

[0021] As a preferred technical solution of the present invention, the drying process refers to drying in an oven at 45-60 °C until constant weight, the temperature of the high-temperature firing is 1100-1180 °C, and the firing time is 1-1.5 h.

[0022] As a preferred technical solution of the present invention, the thickness of the polishing treatment is 0.2-

[0023] 0.3 mm.

[0024] Advantages of the present invention:

[0025] The present invention provides a high-brightness white glaze for ceramic products and its preparation process. By adding a modifier to a raw material containing a metal compound with a whitening effect and performing a melting treatment, the high-brightness whiteness of the high-brightness white glaze for ceramic products is improved. The principle is that SHMP and sodium borate in the modifier decompose to release phosphate ions and borate ions, which react with metal ions in the glaze to form a specific crystal structure, which can change the refractive index and gloss of the glaze, making the glaze surface more bright and transparent; and the glass structure formed by sodium borate in the glaze has good transparency and a high refractive index, which can make the glaze more transparent and shiny, strengthening the high-brightness white effect.

[0026] On the other hand, the present invention adopts a process of keeping the frit warm and slowly cooling it, which improves the dispersibility of the glaze to ensure the uniformity and gloss of the glaze on the blank. Specific embodiments

[0027] To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following examples are used to describe in detail the specific embodiments, structures, features and effects according to the present invention:

[0028] Example 1

[0029] A high-brightness white glaze for ceramic products is composed of the following raw materials in parts by weight:

[0030] 16 parts of titanium dioxide, 15 parts of tin oxide, 5 parts of alumina, 8 parts of high-brightness albite, 6 parts of kaolin, 4 parts of calcite, 10 parts of zirconium silicate, 15 parts of calcined talc powder and 3 parts of modifier.

[0031] The modifier is sodium hexametaphosphate and sodium borate with a mass ratio of 2:1.

[0032] A preparation process of a glaze for high-brightness white ceramic products is as follows:

[0033] M1: Weigh the raw materials according to the weight parts of the raw materials of the glaze for high-brightness white ceramic products;

[0034] M2: Mix the modifier, titanium dioxide, tin oxide, alumina, high-brightness albite, and zirconium silicate in proportion and melt them. Keep the temperature, and then slowly cool to room temperature to obtain frit;

[0035] M3: Mix kaolin, calcite, calcined talc powder, and frit to obtain mixture a1. Then add a1, water, and grinding balls to a ball mill according to proportion for ball milling and pulverizing, and sieve to obtain glaze slurry;

[0036] M4: After adjusting the water content of the glaze slurry to 40%, a glaze for high-brightness white ceramic products is obtained.

[0037] The melting temperature is 1280 °C, the melting time is 2 h, the heat preservation time is 3 h, and the slow cooling rate is 20 °C / min.

[0038] The mass ratio of a1, water, and grinding balls is 3:2:4.

[0039] The ball milling time is 8 h, and the ball milling speed is 675 rpm.

[0040] The sieve mesh number is 200 meshes.

[0041] An application of a glaze for high-brightness white ceramic products, where the glaze for high-brightness white ceramic products is applied to ceramic tiles.

[0042] The glaze for high-brightness white ceramic products is evenly coated on the ceramic body, dried, fired at high temperature, and finally polished to obtain high-brightness white ceramic tiles.

[0043] The drying process means drying in an oven at 60 °C until constant weight. The temperature of the high-temperature firing is 1120 °C, and the firing time is 1 h.

[0044] The thickness of the polishing treatment is 0.2 mm.

[0045] Example 2

[0046] A glaze for high-brightness white ceramic products, which is composed of the following raw materials in weight parts:

[0047] 18 parts of titanium dioxide, 20 parts of tin oxide, 10 parts of alumina, 9 parts of high-brightness albite, 10 parts of kaolin, 8 parts of calcite, 18 parts of zirconium silicate, 16 parts of calcined talc powder, and 5 parts of modifier.

[0048] The modifier is sodium hexametaphosphate and sodium borate with a mass ratio of 4:3.

[0049] A preparation process of a glaze for high-brightness white ceramic products is as follows:

[0050] M1: Weigh the raw materials according to the parts by weight of the raw materials of the glaze for high-brightness white ceramic products;

[0051] M2: Mix the modifier, titanium dioxide, tin oxide, alumina, high-brightness albite, and zirconium silicate in proportion and melt them. Keep them at a constant temperature and then slowly cool them to room temperature to obtain frit;

[0052] M3: Mix kaolin, calcite, calcined talc powder and frit to obtain mixture a1. Then add a1, water and grinding balls to a ball mill in proportion for ball milling, pulverizing and sieving to obtain glaze slurry;

[0053] M4: After adjusting the water content of the glaze slurry to 45%, a glaze for high-brightness white ceramic products is obtained.

[0054] The melting temperature is 1280 °C, the melting time is 2 h, the heat preservation time is 4 h, and the slow cooling rate is 15 °C / min.

[0055] The mass ratio of a1, water and grinding balls is 3:2:4.

[0056] The ball milling time is 8 h and the ball milling speed is 650 rpm.

[0057] The mesh number of sieving is 300 meshes.

[0058] An application of a glaze for high-brightness white ceramic products, and the glaze for high-brightness white ceramic products is applied to ceramic tiles.

[0059] The glaze for high-brightness white ceramic products is evenly coated on a ceramic blank, dried, fired at a high temperature, and finally polished to obtain high-brightness white ceramic tiles.

[0060] The drying process means drying in an oven at 55 °C until constant weight. The temperature of the high-temperature firing is 1120 °C and the firing time is 1 h.

[0061] The thickness of the polishing treatment is 0.2 mm.

[0062] Example 3

[0063] A glaze for high-brightness white ceramic products, which is composed of the following raw materials in parts by weight:

[0064] 18 parts of titanium dioxide, 22 parts of tin oxide, 8 parts of alumina, 10 parts of high-brightness albite, 10 parts of kaolin, 6 parts of calcite, 12 parts of zirconium silicate, 16 parts of calcined talc powder and 5 parts of modifier.

[0065] The modifier is sodium hexametaphosphate and sodium borate with a mass ratio of 5:3.

[0066] A preparation process of a glaze for a high-brightness white ceramic product, the preparation process is as follows:

[0067] M1: Weigh the raw materials according to the weight parts of the raw materials of the glaze for the high-brightness white ceramic product;

[0068] M2: Mix the modifier, titanium dioxide, tin oxide, alumina, high-brightness albite, and zirconium silicate in proportion and melt them, keep them warm, and then slowly cool them to room temperature to obtain frit;

[0069] M3: Mix kaolin, calcite, calcined talc powder and frit to obtain mixture a1, and then add a1, water and grinding balls to a ball mill according to proportion for ball milling and pulverizing, and sieving to obtain glaze slurry;

[0070] M4: After adjusting the water content of the glaze slurry to 50%, a glaze for a high-brightness white ceramic product is obtained.

[0071] The melting temperature is 1280 °C, the melting time is 2 h, the heat preservation time is 4 h, and the slow cooling rate is 15 °C / min.

[0072] The mass ratio of a1, water and grinding balls is 3:2:4.

[0073] The ball milling time is 10 h, and the ball milling speed is 600 rpm.

[0074] The mesh number of sieving is 300 meshes.

[0075] An application of a glaze for a high-brightness white ceramic product, the glaze for a high-brightness white ceramic product is applied to ceramic tiles.

[0076] The glaze for a high-brightness white ceramic product is evenly coated on the ceramic blank, dried, fired at high temperature, and finally polished to obtain high-brightness white ceramic tiles.

[0077] The drying process means drying in an oven at 60 °C until constant weight, the temperature of the high-temperature firing is 1120 °C, and the firing time is 1 h.

[0078] The thickness of the polishing treatment is 0.2 mm.

[0079] Comparative Example 1

[0080] A glaze for a high-brightness white ceramic product, which is composed of the following raw materials in parts by weight:

[0081] 18 parts of titanium dioxide, 20 parts of tin oxide, 10 parts of alumina, 9 parts of high-brightness albite, 10 parts of kaolin, 8 parts of calcite, 18 parts of zirconium silicate, 16 parts of calcined talc powder and 5 parts of modifier.

[0082] The modifier is sodium hexametaphosphate and sodium borate with a mass ratio of 4:3.

[0083] A preparation process of a glaze for high - brightness white ceramic products is as follows:

[0084] M1: Weigh the raw materials according to the weight parts of the raw materials of the glaze for high - brightness white ceramic products;

[0085] M2: Mix the modifier, titanium dioxide, tin oxide, alumina, high - brightness albite, zirconium silicate in proportion, melt and keep warm, and then quench with deionized water to obtain frit;

[0086] M3: Mix kaolin, calcite, calcined talc powder and frit to obtain mixture a1, and then add a1, water and grinding balls into a ball mill in proportion for ball - milling, pulverizing and sieving to obtain glaze slurry;

[0087] M4: After adjusting the water content of the glaze slurry to 45%, a glaze for high - brightness white ceramic products is obtained. The melting temperature is 1280 °C, the melting time is 2 h, the heat - preservation time is 0.5 h, and it is quenched with 25 °C deionized water.

[0088] The mass ratio of a1, water and grinding balls is 3:2:4.

[0089] The ball - milling time is 8 h and the ball - milling speed is 650 rpm.

[0090] The mesh number of sieving is 300 meshes.

[0091] An application of a glaze for high - brightness white ceramic products, where the glaze for high - brightness white ceramic products is applied to ceramic tiles.

[0092] The glaze for high - brightness white ceramic products is evenly coated on the ceramic body, dried, fired at high temperature, and finally polished to obtain high - brightness white ceramic tiles.

[0093] The drying process means drying in an oven at 55 °C until constant weight, the temperature of high - temperature firing is 1120 °C, and the firing time is 1 h.

[0094] The thickness of the polishing treatment is 0.2 mm.

[0095] Comparative Example 2

[0096] A glaze for high - brightness white ceramic products is composed of the following raw materials in parts by weight:

[0097] 18 parts of titanium dioxide, 20 parts of tin oxide, 10 parts of alumina, 9 parts of high - brightness albite, 10 parts of kaolin, 8 parts of calcite, 18 parts of zirconium silicate, 16 parts of calcined talc powder and 5 parts of modifier.

[0098] The modifier is sodium hexametaphosphate and sodium borate with a mass ratio of 4:3.

[0099] A preparation process of a glaze for high - brightness white ceramic products is as follows:

[0100] M1: Weigh the raw materials according to the parts by weight of the raw materials of the high-brightness white ceramic product glaze.

[0101] M2: Mix the modifier, titanium dioxide, tin oxide, alumina, high-brightness white feldspar, zirconium silicate, calcite, and calcined talc powder in proportion and melt them. Keep them at a constant temperature, and then slowly cool them to room temperature to obtain frit.

[0102] M3: Mix kaolin and frit to obtain mixture a1. Then add a1, water, and grinding balls to a ball mill in proportion, grind and crush them, and screen them to obtain glaze slurry.

[0103] M4: After adjusting the water content of the glaze slurry to 45%, obtain the high-brightness white ceramic product glaze.

[0104] The melting temperature is 1280 °C, the melting time is 2 h, the heat preservation time is 4 h, and the slow cooling rate is 15 °C / min.

[0105] The mass ratio of a1, water, and grinding balls is 3:2:4.

[0106] The ball milling time is 8 h, and the ball milling speed is 650 rpm.

[0107] The mesh number of screening is 300 meshes.

[0108] An application of a high-brightness white ceramic product glaze, and the high-brightness white ceramic product glaze is applied to ceramic tiles.

[0109] The high-brightness white ceramic product glaze is evenly coated on the ceramic body, dried, fired at a high temperature, and finally polished to obtain high-brightness white ceramic tiles.

[0110] The drying process means drying in an oven at 55 °C until constant weight. The temperature of the high-temperature firing is 1120 °C, and the firing time is 1 h.

[0111] The thickness of the polishing treatment is 0.2 mm.

[0112] Comparative Example 3

[0113] On the basis of Example 2, the modifier is sodium hexametaphosphate.

[0114] Comparative Example 4

[0115] On the basis of Example 2, the modifier is sodium borate.

[0116] Performance test:

[0117] 1. Test of the whiteness value of the glaze

[0118] Experimental instrument: Automatic color difference meter

[0119] Experimental materials: The highly bright white ceramic tiles obtained in Examples 1-3 and Comparative Examples 1-4.

[0120] Experimental method: Referring to relevant literature (Yang Chang'an. Research on phase-separated glaze and its structural coloration [D]. Shaanxi University of Science and Technology, 2016.), the whiteness of the glaze surface was measured, and the results are shown in Table 1.

[0121] Table 1 Whiteness values of samples

[0122]

[0123]

[0124] Therefore, it can be seen from the test results in Table 1 that the process and raw material formula of the present invention endow the glaze with effective highly bright white characteristics.

[0125] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A glaze for ceramic products with high brightness white, characterized in that, It consists of the following raw materials in parts by weight: 16 - 20 parts of titanium dioxide, 15 - 22 parts of tin oxide, 5 - 10 parts of alumina, 8 - 12 parts of high - brightness albite, 6 - 12 parts of kaolin, 4 - 10 parts of calcite, 10 - 25 parts of zirconium silicate, 15 - 18 parts of calcined talc powder, and 3 - 5 parts of modifier.

2. The glaze for a high-brightness white ceramic product according to claim 1, wherein The modifier is sodium hexametaphosphate and sodium borate with a mass ratio of 4 - 6:

3.

3. A preparation process of a glaze for a high-brightness white ceramic product as described in any one of claims 1 to 2, characterized in that, The specific preparation process is as follows: M1: Weigh the raw materials according to the parts by weight of the raw materials of the high - brightness ceramic product glaze. M2: Mix the modifier, titanium dioxide, tin oxide, alumina, high - brightness albite, and zirconium silicate in proportion and melt them, keep them warm, and then slowly cool them to room temperature to obtain frit. M3: Mix kaolin, calcite, calcined talc powder and frit to obtain mixture a1, and then add a1, water and grinding balls into a ball mill according to proportion for ball - milling and pulverizing, and then sieve to obtain glaze slurry. M4: After adjusting the water content of the glaze slurry to 40% - 50%, the high - brightness ceramic product glaze is obtained.

4. The preparation process of a glaze for a high-brightness white ceramic product according to claim 3, characterized in that, The melting temperature is 1200 - 1300 °C, the melting time is 2 - 2.5 h, the heat - preservation time is 3 - 5 h, and the slow - cooling rate is 10 - 20 °C / min.

5. The preparation process of a glaze for a high-brightness white ceramic product according to claim 3, characterized in that, The mass ratio of a1, water and grinding balls is 3:2 - 1:4 - 6.

6. The preparation process of a glaze for a high-brightness white ceramic product according to claim 3, characterized in that, The ball - milling time is 8 - 10 h, and the ball - milling speed is 600 - 750 rpm.

7. The preparation process of a glaze for a high-brightness white ceramic product according to claim 3, characterized in that, The sieve mesh number is 200 - 300 meshes.

8. Use of a glaze for a ceramic product with high-brightness white as described in any one of claims 1 to 2, characterized in that, The high - brightness ceramic product glaze can be applied to tiles, toilets or washbasins; the high - brightness ceramic product glaze is evenly coated on the ceramic body, dried, fired at high temperature, and finally polished to obtain high - brightness tiles.

9. Use of a glaze for a high-brightness white ceramic product according to claim 8, characterized in that The drying process means drying in an oven at 45 - 60 °C until constant weight, the temperature of the high - temperature firing is 1100 - 1180 °C, and the firing time is 1 - 1.5 h.

10. The application of a glaze for a high-brightness white ceramic product according to claim 8, characterized in that, The thickness of the polishing treatment is 0.2 - 0.3 mm.

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