Sanitary ceramic repairing glaze and ceramic glaze surface defect repairing process

Abstract

The invention discloses sanitary ceramic repairing glaze and a ceramic glaze surface defect repairing process. The repairing glaze comprises ground glaze and self-cleaning snowflake cover glaze, the ground glaze is prepared from 18 to 23 parts of frit, 3 to 8 parts of calcined kaolin, 25 to 30 parts of quartz, 23 to 28 parts of albite, 2 to 5 parts of wollastonite, 9 to 14 parts of calcite, 0.8 to 1.2 parts of calcined zinc oxide, 8 to 12 parts of zirconium silicate, 1 to 3 parts of barium carbonate and 0.8 to 1.2 parts of aluminum oxide; the self-cleaning snowflake cover glaze is prepared from 28 to 33 parts of frit, 12 to 16 parts of calcined kaolin, 2 to 6 parts of calcined zinc oxide, 7 to 12 parts of calcite, 3 to 8 parts of wollastonite, 16 to 22 parts of albite, 0.5 to 1.5 parts of calcined talc, 15 to 20 parts of quartz, 1 to 4 parts of barium carbonate and 0.5 to 13 parts of aluminum oxide. According to the formula of the ground glaze and the self-cleaning snowflake cover glaze, the initial melting temperature of the glaze is reduced by adding a fluxing agent and reducing high-temperature raw materials, the high-temperature chemical reaction time is shortened, and the formula can adapt to a fast firing curve of a refiring kiln.

Description

Technical Field

[0001] This invention relates to the field of ceramic production technology, and in particular to a repair glaze for sanitary ceramics and a repair process for defects in ceramic glaze surfaces. Background Technology

[0002] With the product updates and technological innovations, the self-cleaning function of sanitary ceramics has gradually gained widespread market recognition. With the introduction of new self-cleaning glazes, higher requirements have been put forward for subsequent re-firing repair processes. At present, the re-firing repair process faces the following problems: (1) The total time of the original re-firing curve is as long as 26 hours, which requires a large amount of gas for heating and heat preservation. This does not comply with the national carbon emission reduction policy. In order to reduce energy consumption, enterprises adopt a rapid firing repair process to reduce gas consumption by shortening the overall firing time. The repair process of self-cleaning glaze also needs to adapt to this rapid firing. (2) After the re-firing kiln adopts the rapid firing process, the overall firing time is shortened by about 6 hours compared with the same period last year, resulting in a corresponding reduction in the melting time of the glaze. The original repair glaze is uneven, and the thickness of the repaired part is slightly higher than that of the white glaze porcelain layer. (3) The original production process is an opaque glaze layer plus a transparent snowflake glaze layer (i.e., a self-cleaning functional layer). However, the repair glaze belongs to the opaque glaze system. The repair glaze alone cannot form a transparent snowflake effect, making it difficult for the repaired area to maintain consistency with the surrounding original glaze in terms of color difference. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the aforementioned technical problems in related technologies. To this end, the present invention proposes a sanitary ceramic repair glaze and a repair process for defects in the ceramic glaze surface.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] According to a first aspect of the present invention, a sanitary ceramic repair glaze comprises a base glaze and a self-cleaning snowflake-shaped glaze. The base glaze comprises the following raw materials in parts by weight: 18-23 parts frit, 3-8 parts calcined kaolin, 25-30 parts quartz, 23-28 parts albite, 2-5 parts wollastonite, 9-14 parts calcite, 0.8-1.2 parts calcined zinc oxide, 8-12 parts zirconium silicate, and 1-3 parts barium carbonate. The self-cleaning snowflake glaze comprises the following raw materials in parts by weight: 28-33 parts frit, 12-16 parts calcined kaolin, 2-6 parts calcined zinc oxide, 7-12 parts calcite, 3-8 parts wollastonite, 16-22 parts albite, 0.5-1.5 parts calcined talc, 15-20 parts quartz, 1-4 parts barium carbonate, and 0.5-13 parts alumina.

[0006] Formula Description: The self-cleaning snowflake glaze contains silica as the framework and alumina as the reinforcing ribs. Together, they form the durable foundation of the glaze layer—an aluminosilicate glass structure. Furthermore, by introducing calcium oxide, magnesium oxide, and barium oxide, the connectivity and structure of this network are adjusted, ultimately forming a dense glassy material that achieves an easy-to-clean effect similar to ordinary glass.

[0007] In glazes, frit acts as a flux. Its introduction can reduce the amount of decomposition and combination reactions of the glaze during firing, while lowering the sintering temperature of the glaze, adjusting the melting properties, and providing a more uniform and stable molten material.

[0008] Zinc oxide reacts with other components (such as silicon dioxide and alumina) to form eutectic compounds, allowing the glaze to melt earlier. Furthermore, within the melting temperature range, even with slight fluctuations in firing temperature, the viscosity of the glaze does not change drastically. It maintains suitable fluidity over a relatively wide temperature range without becoming uncontrollably flowy at slightly higher temperatures. Using calcined zinc oxide avoids the tendency of raw zinc oxide to flocculate in the glaze slurry, making it thick, unstable, and difficult to apply. Calcination alters the physical properties of zinc oxide, significantly reducing this flocculation tendency and making the glaze slurry more stable and easier to repair. The high amount of zinc oxide in self-cleaning snowflake glaze provides ample crystal nuclei for the glaze crystals, and combined with an excess of alkaline earth metal elements, ultimately forms a distinct snowflake-like crystal phase.

[0009] The self-cleaning snowflake glaze contains alkaline earth metals such as CaO, ZnO, MgO, and BaO. Alkaline earth metal glazes are less fluid than alkali metal glazes such as K2O, Na2O, and Li2O, giving the glaze a "short" texture (i.e., non-long glass, less fluid than alkali metal glazes). Maintaining relatively high viscosity at high temperatures facilitates the formation of a snowflake glaze layer. Furthermore, glazes containing appropriate amounts of alkaline earth metals exhibit a smaller rate of viscosity change with increasing temperature after reaching the maturation temperature. Unlike alkali metal glazes, their viscosity does not drop sharply; instead, a relatively stable "viscosity plateau" is formed. Small temperature fluctuations do not cause drastic changes in the glaze's appearance (such as excessive flow), providing a buffer zone for safe firing and effectively widening the firing range.

[0010] In some preferred embodiments of the present invention, the amount of calcined zinc oxide in the self-cleaning snowflake glaze is 2-5 parts, the amount of wollastonite is 5-8 parts, and the amount of albite is 16-18 parts.

[0011] In some embodiments of the present invention, the chemical composition of the base glaze after firing is as follows: silicon dioxide 58%-66%, aluminum oxide 8%-12%, iron oxide 0.1%-1%, titanium oxide 0-0.5%, calcium oxide 8%-14%, magnesium oxide 0.5%-1.2%, potassium oxide 1%-2%, sodium oxide 2.0%-4%, zinc oxide 0.8%-1.2%, zirconium oxide 5%-8%, barium oxide 0.5%-2%, and loss on ignition 4%-10%.

[0012] In some embodiments of the present invention, the chemical composition of the self-cleaning snowflake glaze after firing is as follows: silicon dioxide 57%-65%, aluminum oxide 10%-15%, iron oxide 0.1%-0.5%, titanium oxide 0-0.5%, calcium oxide 8%-12%, magnesium oxide 1%-2%, potassium oxide 1%-2%, sodium oxide 1.5%-4%, barium oxide 0.5%-2%, zinc oxide 2.5%-7.5%, and loss on ignition 3%-8%.

[0013] In some embodiments of the present invention, the melting temperature of the molten block is 1030℃-1180℃.

[0014] In some embodiments of the present invention, the base glaze is prepared by the following steps: (1) mixing the raw materials of the base glaze, performing wet ball milling, sieving, removing iron, and drying to obtain base glaze powder; (2) adding carboxymethyl cellulose, water and glycerin to the base glaze powder, stirring and homogenizing to obtain the base glaze.

[0015] In some embodiments of the present invention, in step (2), the mass ratio of the base glaze powder, carboxymethyl cellulose, water and glycerin is 100:(0.8-2.5):(10-18):(10-18).

[0016] In some embodiments of the present invention, the self-cleaning snowflake glaze is prepared by the following method: The raw materials for the self-cleaning snowflake glaze are mixed, carboxymethyl cellulose is added, and wet ball milling is performed. The specific gravity of the ball milling slurry is controlled to be 1.55-1.65, the residue on a 325-mesh sieve is 0-0.1, and the viscosity at a Coulomb cup 4 is 60s-90s, thus obtaining the self-cleaning snowflake glaze. Further, the amount of carboxymethyl cellulose added is 0.2%-0.5% of the total mass of the raw materials for the self-cleaning snowflake glaze.

[0017] According to a second aspect of the present invention, a ceramic glaze defect repair process is performed using the sanitary ceramic repair glaze, the repair process comprising the following steps:

[0018] S1. Polish the defects in the ceramic glaze to make the surface of the defective area smooth;

[0019] S2. Use the base glaze to fill in the glaze defects;

[0020] S3. The self-cleaning snowflake glaze is evenly sprayed onto the filling area of ​​the base glaze using a spray gun;

[0021] S4. After the self-cleaning snowflake glaze has dried, place it in the kiln and fire it according to the rapid firing curve. The total firing time is 18h-22h.

[0022] In some embodiments of the present invention, the nozzle diameter of the spray gun is 1.3mm-1.5mm, the air pressure is ≤0.3MPa, and the glaze pressure is ≤0.3MPa.

[0023] According to a preferred embodiment of the present invention, at least the following beneficial effects are achieved:

[0024] 1. Both the base glaze and the self-cleaning snowflake glaze formulas lower the initial melting temperature of the glaze and reduce the high-temperature raw materials (quartz) by increasing flux (fuse, calcined zinc oxide, etc.) and decreasing the amount of high-temperature raw materials, thus reducing the high-temperature chemical reaction time and adapting to the fast firing curve of a refired kiln. Increased fuse content leads to a decrease in glaze whiteness; the base glaze needs to have its whiteness restored to match the original glaze by slightly increasing the amount of zirconium silicate. After firing, the base glaze perfectly matches the texture and color of the original glaze, ensuring a seamless visual and tactile fusion between the repaired area and the overall product glaze. In the self-cleaning snowflake glaze, the large amount of strong flux fuse and calcined zinc oxide, combined with alkaline earth metal components such as CaO in the formula, significantly improves the glaze's melting performance, lowers the initial melting temperature of the underlying repair glaze, and widens the melting temperature range, making it suitable for low-temperature fast-firing repair processes. In addition, the self-cleaning snowflake glaze uses a spraying process to make the glaze adhere evenly to the surface of the base glaze in the form of fine particles. After rapid firing, it forms a snowflake pattern effect consistent with the original self-cleaning layer, achieving a beautiful and unified appearance while restoring the self-cleaning function of the glaze.

[0025] 2. In the formulation of this invention, the frit serves as a base, providing a low-melting-point, mildly reacting glassy phase matrix. Calcined zinc oxide and calcium oxide act as fluxes, further promoting melting. Simultaneously, they collectively construct a stable, non-flowing snowflake glaze system at high temperatures, which is beneficial for rapid firing repair processes and reduces defects such as glaze flow, blistering, and glaze shrinkage.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a comparison chart of the original firing curve and the rapid firing curve. Detailed Implementation

[0029] The following will describe the concept and technical effects of the present invention clearly and completely with reference to embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0030] Example 1

[0031] This embodiment prepares a base glaze comprising the following raw materials in parts by weight: 18 parts frit, 3 parts calcined kaolin, 27 parts quartz, 28 parts albite, 2 parts wollastonite, 10 parts calcite, 1 part calcined zinc oxide, 8 parts zirconium silicate, 1 part barium carbonate, and 1 part ultrafine alumina.

[0032] The preparation method of the base glaze is as follows:

[0033] (1) Mix the raw materials of the base glaze, put them into water and a ball mill for wet ball milling, and after sieving, removing iron and drying, obtain base glaze powder; (2) Add carboxymethyl cellulose to the base glaze powder, stir evenly, and then add water and glycerin. The mass ratio of base glaze powder, carboxymethyl cellulose, water and glycerin is 100:2:15:15. Stir evenly and then manually hammer and homogenize to obtain base glaze.

[0034] Example 2

[0035] This embodiment prepares a base glaze comprising the following raw materials in parts by weight: 21 parts frit, 3 parts calcined kaolin, 27 parts quartz, 25 parts albite, 2 parts wollastonite, 10 parts calcite, 1 part calcined zinc oxide, 8 parts zirconium silicate, 1 part barium carbonate, and 1 part ultrafine alumina.

[0036] The preparation method of the base glaze is as follows:

[0037] (1) Mix the raw materials of the base glaze, put them into water and a ball mill for wet ball milling, and after sieving, removing iron and drying, obtain base glaze powder; (2) Add carboxymethyl cellulose to the base glaze powder, stir evenly, and then add water and glycerin. The mass ratio of base glaze powder, carboxymethyl cellulose, water and glycerin is 100:2:15:15. Stir evenly and then manually hammer and homogenize to obtain base glaze.

[0038] Example 3

[0039] This embodiment prepares a base glaze comprising the following raw materials in parts by weight: 18 parts frit, 3 parts calcined kaolin, 27 parts quartz, 28 parts albite, 2 parts wollastonite, 10 parts calcite, 1 part calcined zinc oxide, 9 parts zirconium silicate, 1 part barium carbonate, and 1 part ultrafine alumina.

[0040] The preparation method of the base glaze is as follows:

[0041] (1) Mix the raw materials of the base glaze, put them into water and a ball mill for wet ball milling, and after sieving, removing iron and drying, obtain base glaze powder; (2) Add carboxymethyl cellulose to the base glaze powder, stir evenly, and then add water and glycerin. The mass ratio of base glaze powder, carboxymethyl cellulose, water and glycerin is 100:2:15:15. Stir evenly and then manually hammer and homogenize to obtain base glaze.

[0042] Example 4

[0043] This embodiment prepares a self-cleaning snowflake-shaped glaze, comprising the following raw materials in parts by weight: 29.2 parts frit, 14.6 parts calcined kaolin, 2.8 parts calcined zinc oxide, 8.8 parts calcite, 5.7 parts wollastonite, 17 parts albite, 0.9 parts calcined talc, 17.5 parts quartz, 1.8 parts barium carbonate, and 0.6 parts alumina.

[0044] The preparation method of self-cleaning snowflake glaze is as follows: Mix the raw materials of self-cleaning snowflake glaze, add water and a ball mill, and 0.3% of carboxymethyl cellulose by weight of the raw materials for wet ball milling. Control the specific gravity of the ball milling slurry to be 1.55-1.65, the residue on a 325 mesh sieve to be 0-0.1, and the viscosity of the 4-cup sieve to be 60s-90s, and the self-cleaning snowflake glaze is obtained.

[0045] Example 5

[0046] This embodiment prepares a self-cleaning snowflake-shaped glaze, comprising the following raw materials in parts by weight: 29.2 parts frit, 14.6 parts calcined kaolin, 3.8 parts calcined zinc oxide, 8.8 parts calcite, 6.2 parts wollastonite, 16.5 parts albite, 0.9 parts calcined talc, 17.5 parts quartz, 1.8 parts barium carbonate, and 0.6 parts alumina.

[0047] The preparation method of self-cleaning snowflake glaze is as follows: Mix the raw materials of self-cleaning snowflake glaze, add water and a ball mill, and 0.3% of carboxymethyl cellulose by weight of the raw materials for wet ball milling. Control the specific gravity of the ball milling slurry to be 1.55-1.65, the residue on a 325 mesh sieve to be 0-0.1, and the viscosity of the 4-cup sieve to be 60s-90s, and the self-cleaning snowflake glaze is obtained.

[0048] Example 6

[0049] This embodiment prepares a self-cleaning snowflake-shaped glaze, comprising the following raw materials in parts by weight: 29.2 parts frit, 14.6 parts calcined kaolin, 4.8 parts calcined zinc oxide, 8.8 parts calcite, 6.7 parts wollastonite, 16 parts albite, 0.9 parts calcined talc, 17.5 parts quartz, 1.8 parts barium carbonate, and 0.6 parts alumina.

[0050] The preparation method of self-cleaning snowflake glaze is as follows: Mix the raw materials of self-cleaning snowflake glaze, add water and a ball mill, and 0.3% of carboxymethyl cellulose by weight of the raw materials for wet ball milling. Control the specific gravity of the ball milling slurry to be 1.55-1.65, the residue on a 325 mesh sieve to be 0-0.1, and the viscosity of the 4-cup sieve to be 60s-90s, and the self-cleaning snowflake glaze is obtained.

[0051] Comparative Example 1

[0052] This comparative example prepared a pre-repair glaze comprising the following raw materials in parts by weight: 14 parts frit, 3 parts calcined kaolin, 31 parts quartz, 29 parts albite, 2 parts wollastonite, 10 parts calcite, 1 part calcined zinc oxide, 8 parts zirconium silicate, 1 part barium carbonate, and 1 part ultrafine alumina. The preparation process of the pre-repair glaze was the same as in Example 1.

[0053] Comparative Example 2

[0054] This comparative example prepared a base glaze, which differs from Example 1 in that the amounts of frit and albite are different. Specifically, it includes the following raw materials in parts by weight: 15 parts frit, 3 parts calcined kaolin, 27 parts quartz, 31 parts albite, 2 parts wollastonite, 10 parts calcite, 1 part calcined zinc oxide, 8 parts zirconium silicate, 1 part barium carbonate, and 1 part ultrafine alumina.

[0055] Comparative Example 3

[0056] This comparative example prepared a base glaze, which differs from Example 1 in that the amounts of frit and albite are different. Specifically, it includes the following raw materials in parts by weight: 24 parts frit, 3 parts calcined kaolin, 27 parts quartz, 22 parts albite, 2 parts wollastonite, 10 parts calcite, 1 part calcined zinc oxide, 8 parts zirconium silicate, 1 part barium carbonate, and 1 part ultrafine alumina.

[0057] Comparative Example 4

[0058] This comparative example prepared a base glaze, which differs from Example 1 in that the amount of frit and albite is different. Specifically, it includes the following raw materials in parts by weight: 27 parts frit, 3 parts calcined kaolin, 27 parts quartz, 19 parts albite, 2 parts wollastonite, 10 parts calcite, 1 part calcined zinc oxide, 8 parts zirconium silicate, 1 part barium carbonate, and 1 part ultrafine alumina.

[0059] Comparative Example 5

[0060] This comparative example prepared a base glaze, which differs from Example 2 in that the amount of zirconium silicate used is different. Specifically, it includes the following raw materials in parts by weight: 21 parts frit, 3 parts calcined kaolin, 27 parts quartz, 25 parts albite, 2 parts wollastonite, 10 parts calcite, 1 part calcined zinc oxide, 13 parts zirconium silicate, 1 part barium carbonate, and 1 part ultrafine alumina.

[0061] Comparative Example 6

[0062] This comparative example prepared a self-cleaning snowflake-shaped glaze, comprising the following raw materials in parts by weight: 29.2 parts frit, 14.6 parts calcined kaolin, 8.8 parts calcite, 4.7 parts wollastonite, 18.1 parts albite, 0.9 parts calcined talc, 17.5 parts quartz, 1.8 parts barium carbonate, and 0.6 parts alumina.

[0063] Comparative Example 7

[0064] This comparative example prepared a self-cleaning snowflake-shaped glaze, comprising the following raw materials in parts by weight: 29.2 parts frit, 14.6 parts calcined kaolin, 8.8 parts calcite, 4.8 parts wollastonite, 18 parts albite, 0.9 parts calcined talc, 17.5 parts quartz, 1.8 parts barium carbonate, 0.6 parts alumina, and 1.8 parts calcined zinc oxide.

[0065] Comparative Example 8

[0066] This comparative example prepared a self-cleaning snowflake-shaped glaze, comprising the following raw materials in parts by weight: 29.2 parts frit, 14.6 parts calcined kaolin, 8.8 parts calcite, 5.2 parts wollastonite, 17.5 parts albite, 0.9 parts calcined talc, 17.5 parts quartz, 1.8 parts barium carbonate, 0.6 parts alumina, and 5.8 parts calcined zinc oxide.

[0067] Table 1 Chemical composition of Examples 1-3 and Comparative Examples 1-5

[0068]

[0069] Table 2 Chemical composition of Examples 4-6 and Comparative Examples 6-8

[0070]

[0071] Experimental Example 1

[0072] This experiment tested the gloss and whiteness of the base glazes of Examples 1-3 and Comparative Examples 2-5, as well as the original repair glaze of Comparative Example 1. The results are shown in Table 3.

[0073] Preparation of base glaze: The defects in the ceramic glaze are polished to make the surface smooth and burr-free. The base glaze is then filled into the defects, and after drying, the ceramic is placed in a shuttle kiln... Figure 1 The glaze was fired using the "re-firing rapid firing" curve, and the gloss and whiteness of the glaze were tested.

[0074] Preparation of the original repair glaze: The defects in the ceramic glaze are polished to make the surface smooth and burr-free. The original repair glaze is then filled into the defects. After drying, the ceramic glaze is placed in a shuttle kiln and pressed... Figure 1 The glaze was fired using the original heavy-fired kiln firing curve, and the gloss and whiteness of the glaze were tested.

[0075] Table 3

[0076]

[0077] As can be seen from Examples 1-2 and Comparative Examples 2-4 in Table 1, the gloss gradually increases with the increase of frit content and the decrease of albite content, while the whiteness shows a trend of first increasing and then decreasing. The glaze effect of Examples 1 and 2 is relatively close to the original white glaze porcelain layer, but the whiteness is slightly worse. Example 3 is based on Example 2 with a small increase in zirconium silicate content, and its whiteness is closer to the original white glaze porcelain layer and the original repair glaze (Comparative Example 1), indicating that the formulas of Examples 1-3 can adapt to the rapid firing curve of the refired kiln while ensuring the glaze effect. Comparative Example 5 has a significantly increased zirconium silicate content, resulting in a significant increase in whiteness and a large difference in color from the original white glaze porcelain layer.

[0078] Experimental Example 2

[0079] This experiment tested the glaze effect and melting length of the self-cleaning snowflake glazes of Examples 4-6 and Comparative Examples 6-8, and the results are shown in Table 4.

[0080] Preparation of self-cleaning snowflake glaze: The ceramic glaze surface defects are polished to make the surface smooth and burr-free. The base glaze is then filled into the defects. The self-cleaning snowflake glaze is then evenly sprayed onto the filled areas using a 1.5mm nozzle spray gun, controlling the spray gun air pressure to ≤0.3MPa and the glaze pressure to ≤0.3MPa. After drying, the surface is placed in a shuttle kiln... Figure 1 The glaze was fired using the "re-firing and rapid firing" curve, and the snowflake shape and number of pores on the glaze surface were observed.

[0081] Length of glaze flow: Take the glaze and dry it. After drying, cool it to room temperature and grind the glaze into a fine powder. Weigh 4.2g of the dried powder with a balance and pour it into a hand-pressed casting tool. Press it into a cylindrical shape with a diameter of 1.5cm and a height of 1.5cm. Finally, put it into a rapid firing kiln and fire it according to the "rapid firing in a heavy firing kiln". After firing, use a vernier caliper to measure the length of the glaze flow.

[0082] Table 4

[0083]

[0084] As shown in Tables 2 and 4, with the increase of calcined zinc oxide and wollastonite and the decrease of albite, the content of alkaline earth metals (CaO, ZnO) in the glaze increases, while the content of alkali metals (Na2O) decreases, with zinc oxide showing a significant increase. The test results in Table 4 show that when the amount of calcined zinc oxide is less than 2 parts, the snowflake shape of the glaze is not obvious. As the amount of calcined zinc oxide increases, a uniform snowflake shape begins to form and gradually increases in size, pores also begin to appear, and the melt length gradually increases. Considering all the data, Examples 4-6 are the preferred formulations.

[0085] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A sanitary ceramic repair glaze, characterized in that, The product includes a base glaze and a self-cleaning snowflake-shaped glaze. The base glaze comprises the following raw materials in parts by weight: 18-23 parts frit, 3-8 parts calcined kaolin, 25-30 parts quartz, 23-28 parts albite, 2-5 parts wollastonite, 9-14 parts calcite, 0.8-1.2 parts calcined zinc oxide, 8-12 parts zirconium silicate, 1-3 parts barium carbonate, and 0.8-1.2 parts alumina. The self-cleaning snowflake-shaped glaze comprises the following raw materials in parts by weight: 28-33 parts frit, 12-16 parts calcined kaolin, 2-6 parts calcined zinc oxide, 7-12 parts calcite, 3-8 parts wollastonite, 16-22 parts albite, 0.5-1.5 parts calcined talc, 15-20 parts quartz, 1-4 parts barium carbonate, and 0.5-13 parts alumina.

2. The sanitary ceramic repair glaze according to claim 1, characterized in that, The chemical composition of the base glaze after firing is as follows: silicon dioxide 58%-66%, aluminum oxide 8%-12%, iron oxide 0.1%-1%, titanium oxide 0-0.5%, calcium oxide 8%-14%, magnesium oxide 0.5%-1.2%, potassium oxide 1%-2%, sodium oxide 2.0%-4%, zinc oxide 0.8%-1.2%, zirconium oxide 5%-8%, barium oxide 0.5%-2%, and loss on ignition 4%-10%.

3. The sanitary ceramic repair glaze according to claim 1, characterized in that, The chemical composition of the self-cleaning snowflake glaze after firing is as follows: silicon dioxide 57%-65%, aluminum oxide 10%-15%, iron oxide 0.1%-0.5%, titanium oxide 0-0.5%, calcium oxide 8%-12%, magnesium oxide 1%-2%, potassium oxide 1%-2%, sodium oxide 1.5%-4%, barium oxide 0.5%-2%, zinc oxide 2.5%-7.5%, and loss on ignition 3%-8%.

4. The sanitary ceramic repair glaze according to claim 1, characterized in that, The melting temperature of the molten block is 1030℃-1180℃.

5. The sanitary ceramic repair glaze according to claim 1, characterized in that, The base glaze is prepared by the following steps: (1) Mix the raw materials of the base glaze, perform wet ball milling, sieve, remove iron, and dry to obtain base glaze powder; (2) Add carboxymethyl cellulose, water and glycerin to the base glaze powder, stir and homogenize to obtain the base glaze.

6. The sanitary ceramic repair glaze according to claim 5, characterized in that, In step (2), the mass ratio of the base glaze powder, carboxymethyl cellulose, water and glycerin is 100:(0.8-2.5):(10-18):(10-18).

7. The sanitary ceramic repair glaze according to claim 1, characterized in that, The self-cleaning snowflake glaze is prepared by the following method: the raw materials of the self-cleaning snowflake glaze are mixed, carboxymethyl cellulose is added and wet ball milling is carried out, the specific gravity of the ball mill slurry is controlled to be 1.55-1.65, the residue on a 325 mesh sieve is 0-0.1, and the viscosity of the Cotton Cup 4 is 60s-90s, thus obtaining the self-cleaning snowflake glaze.

8. A repair process for defects in ceramic glaze, characterized in that, The repair process, which utilizes the sanitary ceramic repair glaze according to any one of claims 1-7, comprises the following steps: S1. Polish the defects in the ceramic glaze to make the surface of the defective area smooth; S2. Use the base glaze to fill in the glaze defects; S3. The self-cleaning snowflake glaze is evenly sprayed onto the filling area of ​​the base glaze using a spray gun; S4. After the self-cleaning snowflake glaze has dried, place it in a kiln and fire it according to the rapid firing curve. The total firing time is 18h-22h.

9. The repair process according to claim 8, characterized in that, The spray gun has a nozzle diameter of 1.3mm-1.5mm, an air pressure of ≤0.3MPa, and a glaze pressure of ≤0.3MPa.

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