Medium-temperature matte double-layer kiln-changed glaze and preparation method thereof

Abstract

The present invention discloses a medium-temperature matte double-layer kiln-changed glaze and a preparation method thereof, comprising a base glaze and a top glaze. The base glaze comprises the following raw materials in parts by weight: 8-12 parts of boron frit, 35-45 parts of potassium feldspar, 8-12 parts of quartz powder, 10-12 parts of calcite, 8-10 parts of wollastonite, 8-11 parts of alumina powder, 4-6 parts of burnt talc, 5-6 parts of burnt zinc, 5-6 parts of Guizhou soil, 5-7 parts of titanium dioxide, and 5-10 parts of colorant; the top glaze comprises the following raw materials in parts by weight: The raw materials in measured parts are: 25-35 parts of boron frit, 20-30 parts of potassium feldspar, 8-12 parts of quartz powder, 8-15 parts of calcite, 10-20 parts of wollastonite, 20-30 parts of dolomite, 20-30 parts of Longyan soil, 5-10 parts of titanium dioxide, 3-8 parts of aluminum powder, and 1-5 parts of colorant; the matte double-layer kiln-changed glaze with low lead and cadmium content, strong thermal stability, good thermal shock resistance, and low firing temperature is produced through ball milling, screening, glaze spraying, and firing.

Description

Technical Field

[0001] The invention belongs to the technical field of daily-use ceramic preparation, and particularly relates to a medium-temperature matte double-layer kiln-changed glaze and a preparation method thereof. Background Art

[0002] my country's matte, double-layer kiln-changed glazes offer a unique effect, a long-standing market gap. While the market has primarily focused on standard glossy or matte glazes, we gradually developed a series of glossy, double-layer kiln-changed glazes, which proved popular with customers. With further market feedback, many customers expressed higher expectations, requesting matte or matte kiln-changed glazes. Consequently, we developed this series of reaction kiln-changed glazes, reflecting these needs. Both of these kiln-changed glazes have been very popular in the market and are experiencing rapid growth.

[0003] Chinese patent application publication number CN113800770A discloses a medium-temperature, double-layer kiln-fired glaze and its production method. The base glaze comprises the following raw materials and their respective weight percentages: 27% potassium feldspar, 9% quartz, 15% calcite, 4% aluminum powder, 27% Jiepai clay, and 18% colorant. The top glaze comprises the following raw materials and their respective weight percentages: 52% boron frit, 11% quartz, 3% bone carbon, 5% spodumene, 11% zinc oxide, 7% talc, and 11% Jiepai clay. This patent discloses a formula for a bright, double-layer glaze.

[0004] Chinese patent application publication number CN110790506A discloses a granular double-layer reaction glaze and its preparation method. The granular double-layer reaction glaze comprises the following components by weight: base glaze: 30-40 parts albite, 5-15 parts quartz, 5-15 parts wollastonite, 2-6 parts calcined alumina, 25-35 parts kaolin, and 15-25 parts colorant; top glaze: 35-45 parts high-boron frit, 15-25 parts quartz, 5-10 parts wollastonite, 5-15 parts spodumene, 10-20 parts calcined zinc oxide, 5-15 parts kaolin, 5-10 parts calcined talc, 5-10 parts titanium dioxide, and 5-15 parts zirconium silicate. The glaze has a short firing time and exhibits high thermal shock resistance and glaze surface hardness. The patent also discloses a bright glaze.

[0005] Therefore, it is urgent to develop a medium-temperature matte double-layer kiln-changed glaze and a preparation method thereof to meet current market demand. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a medium-temperature matte double-layer kiln-changed glaze and a preparation method thereof, so as to obtain a matte double-layer kiln-changed glaze with low lead and cadmium content, good thermal shock resistance and low firing temperature.

[0007] The present invention includes:

[0008] A medium-temperature matte double-layer kiln-changed glaze, the base glaze of which comprises the following raw materials in parts by weight: 8-12 parts of boron frit, 35-45 parts of potassium feldspar, 8-12 parts of quartz powder, 10-12 parts of calcite, 8-10 parts of wollastonite, 8-11 parts of alumina powder, 4-6 parts of burnt talc, 5-6 parts of burnt zinc, 5-6 parts of Guizhou clay, 5-7 parts of titanium dioxide, and 5-10 parts of colorant;

[0009] The top glaze of the medium-temperature matte double-layer kiln-changed glaze includes the following raw materials in parts by weight: 25-35 parts of boron frit, 20-30 parts of potassium feldspar, 8-12 parts of quartz powder, 8-15 parts of calcite, 10-20 parts of wollastonite, 20-30 parts of dolomite, 20-30 parts of Longyan soil, 5-10 parts of titanium dioxide, 3-8 parts of aluminum powder, and 1-5 parts of colorant.

[0010] The boron frit is a strong flux containing boron, which has the function of forming glass with other silicates and promoting phase separation, and can also reduce the high-temperature viscosity of the glaze and increase the glossiness of the glaze surface.

[0011] Table 1 Composition of raw materials

[0012]

[0013] In one embodiment, the base glaze of the medium-temperature matte double-layer kiln-changed glaze includes the following raw materials in parts by weight: 10 parts of boron frit, 40 parts of potassium feldspar, 10 parts of quartz powder, 10 parts of calcite, 10 parts of wollastonite, 9 parts of aluminum powder, 6 parts of burnt talc, 5 parts of burnt zinc, 5 parts of Guizhou soil, 5 parts of titanium dioxide, and 10 parts of colorant.

[0014] In one embodiment, the top glaze of the medium-temperature matte double-layer kiln-changed glaze includes the following raw materials in parts by weight: 30 parts of boron frit, 25 parts of potassium feldspar, 10 parts of quartz powder, 10 parts of calcite, 15 parts of wollastonite, 25 parts of dolomite, 25 parts of Longyan soil, 5 parts of titanium dioxide, 5 parts of aluminum powder, and 2 parts of colorant.

[0015] In one embodiment, the colorant is one of red iron oxide, manganese carbonate, cobalt oxide or copper oxide.

[0016] Another object of the present invention is to provide a method for preparing the above-mentioned medium-temperature matte double-layer kiln-changed glaze, comprising the following steps:

[0017] (1) Prepare the base glaze and top glaze materials according to their weights;

[0018] (2) wet-milling the base glaze raw materials and the top glaze raw materials, respectively, and sieving to obtain base glaze slurry and top glaze slurry;

[0019] (3) Add water to adjust the concentration of the base glaze slurry and the top glaze slurry, then attach the base glaze slurry to the body, and then attach the top glaze slurry to the base glaze slurry to form a semi-finished product, dry it, and fire it in an oxidizing atmosphere at a firing temperature of 1230-1250°C to obtain a finished product.

[0020] In one embodiment, the fineness of the base glaze slurry and the top glaze slurry is 0.02-0.04% on a 250 mesh sieve.

[0021] In one embodiment, the concentration of the base glaze slurry is 40-45 degrees Baume, and the concentration of the top glaze slurry is 55-60 degrees Baume.

[0022] In one embodiment, the thickness of the base glaze is 0.1-0.2 mm, and the thickness of the top glaze is 0.05-0.1 mm.

[0023] In one embodiment, the base glaze slurry is attached to the body by dipping, glazing or spraying; the top glaze slurry is attached to the base glaze by spraying.

[0024] In one embodiment, the wet ball milling method is as follows: the ball milling time is 20-24 hours, the mass ratio of the ball milling raw materials: zirconium aluminum spherules: water is 1:1.5-2:0.5, and the weight ratio of large spherules, medium spherules, and small spherules in the zirconium aluminum spherules is 2:5:3.

[0025] Beneficial effects of the present invention:

[0026] (1) The base glaze of the present invention uses a large amount of calcium aluminum titanium matte glaze layer to carry the kiln-fired effect of the surface glaze. The surface glaze is made of boron frit as the main material, with a large amount of dolomite and kaolin, an appropriate amount of titanium dioxide and calcined talc and a small amount of calcium. When the surface glaze is in the initial melting state at high temperature, fine crystal spots are formed in the state of high calcium magnesium matte glaze due to the effect of titanium dioxide. Furthermore, the surface glaze is mainly made of boron frit and has a low initial melting temperature and low high temperature viscosity, while the base glaze has a high initial melting temperature and high calcium aluminum, etc., which form different crystals under the action of titanium dioxide and only react at high temperature to release a large amount of gas. Under high temperature, the gas breaks through the initial melting state of the surface glaze, causing disturbance to the glaze layer and increasing the flow of the glaze layer to form fine patterns of different sizes. Under the dissolving action of the surface glaze, some of the metal oxides of the base glaze penetrate into the surface glaze, and fine patterns of different colors are produced due to the different solubility of the surface glaze for various metal oxides.

[0027] (2) The present invention improves the process of adding the bottom glaze to the top glaze and strictly controls the formula composition of the bottom glaze and the top glaze, thereby increasing the bonding between the body and the glaze, greatly improving the thermal shock resistance and the firing range, and by controlling the addition amount of key components, increasing the flow of the glaze layer to form fine patterns of varying sizes and forming a kiln-changed effect;

[0028] (3) The thermal stability and lead and cadmium dissolution of the matte double-layer kiln-changed glaze product of the present invention meet the daily-use porcelain standards of the country and the exporting countries; the product firing system of the present invention does not require a specific kiln firing and is suitable for large-scale production;

[0029] (4) The present invention mainly uses the kiln-changed glaze of uniform porcelain as the top glaze of the double-layer glaze, and designs a matching bottom glaze to achieve a perfect combination of the artistry and color richness of the glaze. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The medium-temperature matte double-layer kiln-changed glaze prepared in Example 1 of the present invention;

[0031] Figure 2 This is the medium-temperature matte double-layer kiln-changed glaze prepared in Example 2 of the present invention. DETAILED DESCRIPTION

[0032] Example 1

[0033] The formula components and contents of the present invention are:

[0034] Base glaze: 10 parts by weight of boron frit from Liling, 40 parts by weight of potassium feldspar from Hubei, 10 parts by weight of quartz powder from Liling, 10 parts by weight of calcite from Guangxi, 10 parts by weight of wollastonite from Jiangxi, 9 parts by weight of alumina powder from Zhengzhou, 6 parts by weight of burned talc from Guangxi, 5 parts by weight of burned zinc from Guiyang, 5 parts by weight of special grade Guizhou clay from Guizhou, 5 parts by weight of titanium dioxide from Zhuzhou, 4 parts by weight of Golden Eagle vanadium zirconium blue, and 5 parts by weight of Golden Eagle spectrum yellow;

[0035] Top glaze: 30 parts by weight of boron frit from Liling, 25 parts by weight of potassium feldspar from Hubei, 10 parts by weight of quartz powder from Liling, 10 parts by weight of calcite from Guangxi, 15 parts by weight of wollastonite from Jiangxi, 25 parts by weight of dolomite from Guangxi, 25 parts by weight of soil from Longyan, Fujian, 5 parts by weight of titanium dioxide from Zhuzhou, 5 parts by weight of aluminum powder from Zhengzhou, and 2 parts by weight of copper oxide from Shanghai;

[0036] The production method of medium temperature matte double layer kiln-changed glaze is:

[0037] 1. Prepare the materials according to the components and their mass percentages, add the raw materials into a ball mill, add an appropriate amount of water, and wet-mill for 22 hours to obtain a glaze with a fineness of 0.02-0.04% residue after passing through a 250-mesh sieve, and pass the glaze through a 120-mesh sieve to obtain a glaze slurry; wherein the mass ratio of raw materials: ball stone: water is 1:1.5:0.5, and the weight ratio of large ball stone, medium ball stone, and small ball stone in the zirconium-aluminum ball stone is 2:5:3.

[0038] 2. Add water to adjust the base glaze slurry concentration to 40 degrees Baume. Then, apply the base glaze to the body by dipping. Then, spray the top glaze on top of the base glaze. Dry at 50°C for 2 hours. After drying, fire the body in an oxidizing atmosphere at a maximum temperature of 1250°C for 7 hours to obtain the finished product.

[0039] Example 2

[0040] The formula components and contents of the present invention are:

[0041] Base glaze: 12 parts by weight of boron frit from Liling, 40 parts by weight of potassium feldspar from Hubei, 10 parts by weight of quartz powder from Liling, 10 parts by weight of calcite from Guangxi, 10 parts by weight of wollastonite from Jiangxi, 10 parts by weight of alumina powder from Zhengzhou, 6 parts by weight of burned talc from Guangxi, 5 parts by weight of burned zinc from Guiyang, 5 parts by weight of special grade Guizhou clay from Guizhou, 6 parts by weight of titanium dioxide from Zhuzhou, 10 parts by weight of red iron oxide from Yantai, and 5 parts by weight of cobalt black from Golden Eagle.

[0042] Top glaze: 35 parts by weight of boron frit from Liling, 20 parts by weight of potassium feldspar from Hubei, 10 parts by weight of quartz powder from Liling, 10 parts by weight of calcite from Guangxi, 15 parts by weight of wollastonite from Jiangxi, 25 parts by weight of dolomite from Guangxi, 25 parts by weight of soil from Longyan, Fujian, 5 parts by weight of titanium dioxide from Zhuzhou, 4 parts by weight of aluminum powder from Zhengzhou, and 1 part by weight of Golden Eagle cobalt black;

[0043] Production method of medium temperature matte double-layer kiln-changed glaze:

[0044] 1. Prepare the materials according to the components and their mass percentages, add the raw materials into a ball mill, add an appropriate amount of water, and wet-mill for 22 hours to obtain a glaze with a fineness of 0.02-0.04% residue after passing through a 250-mesh sieve, and pass the glaze through a 120-mesh sieve to obtain a glaze slurry; wherein the mass ratio of raw materials: ball stone: water is 1:2:0.5, and the weight ratio of large ball stone, medium ball stone, and small ball stone in the zirconium-aluminum ball stone is 2:5:3.

[0045] 2. Add water to adjust the base glaze slurry concentration to 42 degrees Baume. Then, apply the base glaze to the body by dipping, glazing, or spraying. Then, spray the top glaze on top of the base glaze. Dry at 45°C for 2 hours. After drying, fire the body in an oxidizing atmosphere at a maximum temperature of 1250°C for 7 hours to obtain the finished product.

[0046] Example 3

[0047] The formula components and contents of the present invention are:

[0048] Base glaze: 12 parts by weight of boron frit from Liling, 40 parts by weight of potassium feldspar from Hubei, 10 parts by weight of quartz powder from Liling, 10 parts by weight of calcite from Guangxi, 10 parts by weight of wollastonite from Jiangxi, 10 parts by weight of alumina powder from Zhengzhou, 6 parts by weight of burned talc from Guangxi, 5 parts by weight of burned zinc from Guiyang, 5 parts by weight of special grade Guizhou clay from Guizhou, 6 parts by weight of titanium dioxide from Zhuzhou, 3 parts by weight of cobalt black from Golden Eagle, and 2 parts by weight of copper oxide from Huafei;

[0049] Top glaze: 30 parts by weight of boron frit from Liling, 25 parts by weight of potassium feldspar from Hubei, 10 parts by weight of quartz powder from Liling, 10 parts by weight of calcite from Guangxi, 15 parts by weight of wollastonite from Jiangxi, 25 parts by weight of dolomite from Guangxi, 20 parts by weight of soil from Longyan, Fujian, 6 parts by weight of titanium dioxide from Zhuzhou, and 8 parts by weight of aluminum powder from Zhengzhou;

[0050] Production method of medium temperature double-layer kiln-changed glaze:

[0051] 1. Prepare the materials according to the components and their mass percentages, add the raw materials into a ball mill, add an appropriate amount of water, and wet-mill for 22 hours to obtain a glaze with a fineness of 0.02-0.04% residue after passing through a 250-mesh sieve, and pass the glaze through a 120-mesh sieve to obtain a glaze slurry; wherein the mass ratio of raw materials: ball stone: water is 1:2:0.5, and the weight ratio of large ball stone, medium ball stone, and small ball stone in the zirconium-aluminum ball stone is 2:5:3.

[0052] 2. Add water to adjust the base glaze slurry concentration to 40 degrees Baume. Then, apply the base glaze to the body by dipping, glazing, or spraying. Then, spray the top glaze on top of the base glaze. Dry at 60°C for 2 hours. After drying, fire the body in an oxidizing atmosphere at a maximum temperature of 1250°C for 7 hours to obtain the finished product.

[0053] Example 4

[0054] The base glaze is the same as in Example 1;

[0055] Top glaze: 25 parts by weight of boron frit from Liling, 30 parts by weight of potassium feldspar from Hubei, 8 parts by weight of quartz powder from Liling, 15 parts by weight of calcite from Guangxi, 10 parts by weight of wollastonite from Jiangxi, 20 parts by weight of dolomite from Guangxi, 30 parts by weight of soil from Longyan, Fujian, 10 parts by weight of titanium dioxide from Zhuzhou, 8 parts by weight of aluminum powder from Zhengzhou, and 2 parts by weight of copper oxide from Shanghai;

[0056] The preparation method is the same as that of Example 1.

[0057] Example 5

[0058] Base glaze: 8 parts by weight of boron frit from Liling, 42 parts by weight of potassium feldspar from Hubei, 11 parts by weight of quartz powder from Liling, 10 parts by weight of calcite from Guangxi, 10 parts by weight of wollastonite from Jiangxi, 8 parts by weight of alumina powder from Zhengzhou, 4 parts by weight of burned talc from Guangxi, 6 parts by weight of burned zinc from Guiyang, 5 parts by weight of special grade Guizhou clay from Guizhou, 7 parts by weight of titanium dioxide from Zhuzhou, 4 parts by weight of Golden Eagle vanadium zirconium blue, and 5 parts by weight of Golden Eagle spectrum yellow;

[0059] The glaze is the same as in Example 1;

[0060] The preparation method is the same as that of Example 1.

[0061] Comparative Example 1

[0062] The weight portion of Zhengzhou aluminum powder in the base glaze is 0 parts, and the rest is the same as in Example 1.

[0063] Comparative Example 2

[0064] The content of titanium dioxide in the glaze is 0 parts, and the rest is the same as in Example 1.

[0065] Comparative Example 3

[0066] The Liling boron frit in the bottom glaze was removed, and the rest was the same as in Example 1.

[0067] Comparative Example 4

[0068] The formula components and contents of the present invention are:

[0069] Base glaze: 15 parts by weight of boron frit from Liling, 30 parts by weight of potassium feldspar from Hubei, 6 parts by weight of quartz powder from Liling, 14 parts by weight of calcite from Guangxi, 10 parts by weight of wollastonite from Jiangxi, 6 parts by weight of alumina powder from Zhengzhou, 8 parts by weight of burned talc from Guangxi, 4 parts by weight of burned zinc from Guiyang, 7 parts by weight of special grade Guizhou clay from Guizhou, 8 parts by weight of titanium dioxide from Zhuzhou, 4 parts by weight of Golden Eagle vanadium zirconium blue, 5 parts by weight of Golden Eagle spectrum yellow;

[0070] Top glaze: 40 parts by weight of boron frit from Liling, 15 parts by weight of potassium feldspar from Hubei, 15 parts by weight of quartz powder from Liling, 7 parts by weight of calcite from Guangxi, 8 parts by weight of wollastonite from Jiangxi, 30 parts by weight of dolomite from Guangxi, 15 parts by weight of soil from Longyan, Fujian, 3 parts by weight of titanium dioxide from Zhuzhou, 10 parts by weight of aluminum powder from Zhengzhou, and 2 parts by weight of copper oxide from Shanghai;

[0071] Other details are the same as in Example 1.

[0072] Comparative Example 5

[0073] Base glaze: 2 parts by weight of boron frit from Liling, 30 parts by weight of potassium feldspar from Hubei, 14 parts by weight of quartz powder from Liling, 5 parts by weight of calcite from Guangxi, 15 parts by weight of wollastonite from Jiangxi, 5 parts by weight of alumina powder from Zhengzhou, 10 parts by weight of burned talc from Guangxi, 8 parts by weight of burned zinc from Guiyang, 2 parts by weight of special grade Guizhou clay from Guizhou, 12 parts by weight of titanium dioxide from Zhuzhou, 4 parts by weight of Golden Eagle vanadium zirconium blue, 5 parts by weight of Golden Eagle spectrum yellow;

[0074] Top glaze: 20 parts by weight of boron frit from Liling, 35 parts by weight of potassium feldspar from Hubei, 15 parts by weight of quartz powder from Liling, 15 parts by weight of calcite from Guangxi, 15 parts by weight of wollastonite from Jiangxi, 35 parts by weight of dolomite from Guangxi, 10 parts by weight of soil from Longyan, Fujian, 8 parts by weight of titanium dioxide from Zhuzhou, 2 parts by weight of aluminum powder from Zhengzhou, and 2 parts by weight of copper oxide from Shanghai;

[0075] Other details are the same as in Example 1.

[0076] In order to illustrate the performance of the ceramics of the present application, the applicant tested the products of Examples 1-5 and Comparative Examples 1-5 and obtained the test data shown in Table 2.

[0077] Table 2 Ceramic performance test table of different products

[0078]

[0079]

[0080] The lead and cadmium capacity detection method of the present invention is ASTM C738-94 (Reapproved 2011), and the thermal stability detection method is GB / T3298-2008.

[0081] Examples 1-5 are medium-temperature matte double-layer kiln-changed glaze formulas within the scope of this application. The obtained products have clear lines, matte glaze surface, and fine or mesh texture.

[0082] No Zhengzhou aluminum powder is added to the base glaze of Comparative Example 1. Aluminum powder is used to prepare matte glaze and also serves as a medium for color layer analysis in glaze. No aluminum powder is added to the base glaze of Comparative Example 1, resulting in slight bubbling on the glaze surface, a bright glaze surface, and no kiln-changing effect.

[0083] In Comparative Example 2, titanium dioxide is not added to the glaze, which changes the chemical composition of the glaze formula, resulting in no kiln-changing effect and affecting the formation of fine crystal spots in the glaze.

[0084] No Liling boron frit is added to the base glaze of Comparative Example 3. The function of boron frit in ceramic glaze is to quickly mature and form a smooth glaze layer. Without adding boron frit to the base glaze, the glaze surface will be matte and there will be no obvious kiln-fired effect.

[0085] In the base glaze and top glaze formula of Comparative Example 4, boron frit, titanium dioxide and other ingredients were added, and components such as potassium feldspar and calcite were reduced, resulting in the glaze surface becoming brighter and the reaction effect being not obvious.

[0086] In Comparative Example 5, the base glaze and top glaze formulas reduced ingredients such as boron frit, resulting in the glaze being excessively matte and having a bubble phenomenon.

[0087] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0088] The one or more embodiments of this application are intended to encompass all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this application should be included in the scope of protection of this application.

Claims

1. A medium-temperature matte double-layer kiln-changed glaze, characterized by: The base glaze of the medium-temperature matte double-layer kiln-changed glaze comprises the following raw materials in parts by weight: 8-12 parts of boron frit, 35-45 parts of potassium feldspar, 8-12 parts of quartz powder, 10-12 parts of calcite, 8-10 parts of wollastonite, 8-11 parts of alumina powder, 4-6 parts of burnt talc, 5-6 parts of burnt zinc, 5-6 parts of Guizhou soil, 5-7 parts of titanium dioxide, and 5-10 parts of colorant; The top glaze of the medium-temperature matte double-layer kiln-changed glaze includes the following raw materials in parts by weight: 25-35 parts of boron frit, 20-30 parts of potassium feldspar, 8-12 parts of quartz powder, 8-15 parts of calcite, 10-20 parts of wollastonite, 20-30 parts of dolomite, 20-30 parts of Longyan soil, 5-10 parts of titanium dioxide, 3-8 parts of aluminum powder, and 1-5 parts of colorant.

2. The medium-temperature matte double-layer kiln-changed glaze according to claim 1, characterized in that: The base glaze of the medium-temperature matte double-layer kiln-changed glaze includes the following raw materials in parts by weight: 10 parts of boron frit, 40 parts of potassium feldspar, 10 parts of quartz powder, 10 parts of calcite, 10 parts of wollastonite, 9 parts of alumina powder, 6 parts of burnt talc, 5 parts of burnt zinc, 5 parts of Guizhou soil, 5 parts of titanium dioxide, and 10 parts of colorant.

3. The medium-temperature matte double-layer kiln-changed glaze according to claim 1, characterized in that: The top glaze of the medium-temperature matte double-layer kiln-changed glaze includes the following raw materials in parts by weight: 30 parts of boron frit, 25 parts of potassium feldspar, 10 parts of quartz powder, 10 parts of calcite, 15 parts of wollastonite, 25 parts of dolomite, 25 parts of Longyan soil, 5 parts of titanium dioxide, 5 parts of aluminum powder, and 2 parts of colorant.

4. The medium-temperature matte double-layer kiln-changed glaze according to any one of claims 1 to 3, characterized in that: The colorant is one of red iron oxide, manganese carbonate, cobalt oxide or copper oxide.

5. A method for preparing the medium-temperature matte double-layer kiln-changed glaze according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Prepare the base glaze and top glaze materials according to their weights; (2) wet-ball milling the base glaze raw materials and the top glaze raw materials, respectively, and sieving to obtain base glaze slurry and top glaze slurry; (3) Add water to adjust the concentration of the base glaze slurry and the top glaze slurry, then attach the base glaze slurry to the body, and then attach the top glaze slurry to the base glaze slurry to form a semi-finished product, dry it, and fire it in an oxidizing atmosphere at a firing temperature of 1230-1250℃ to obtain the finished product.

6. The method for preparing the medium-temperature matte double-layer kiln-changed glaze according to claim 5, characterized in that: The fineness of the base glaze slurry and the top glaze slurry is 0.02-0.04% on a 250-mesh sieve.

7. The method for preparing the medium-temperature matte double-layer kiln-changed glaze according to claim 5, characterized in that: The concentration of the bottom glaze slurry is 40-45 degrees Baume, and the concentration of the top glaze slurry is 55-60 degrees Baume.

8. The method for preparing the medium-temperature matte double-layer kiln-changed glaze according to claim 5, characterized in that: The thickness of the bottom glaze is 0.1-0.2 mm, and the thickness of the top glaze is 0.05-0.1 mm.

9. The method for preparing the medium-temperature matte double-layer kiln-changed glaze according to claim 5, characterized in that: The bottom glaze slurry is attached to the body by dipping, glazing or spraying; the top glaze slurry is attached to the bottom glaze by spraying.

10. The method for preparing the medium-temperature matte double-layer kiln-changed glaze according to any one of claims 5 to 9, characterized in that: The wet ball milling method is as follows: the ball milling time is 20-24 hours, the mass ratio of the ball milling raw materials: zirconium aluminum spherules: water is 1:1.5-2:0.5, and the weight ratio of large spherules, medium spherules, and small spherules in the zirconium aluminum spherules is 2:5:3.

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