CN114315425B - Soft glazed tile with skin texture and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of ceramic tiles, and provides a soft glazed tile with skin texture and a preparation method thereof, wherein the soft glazed tile is made of a blank body, soft glaze and digital protective glaze; the soft glaze comprises soft glaze, and the soft glaze comprises the following components in percentage by weight: 30-35% of low-melting-point glass powder, 3-5% of anorthite, 5-7% of sillimanite, 4-7% of calcined alumina, 3-6% of montmorillonite, 5-8% of magnesite, 3-6% of calcined zinc oxide, 15-25% of soft frit and 14-18% of zirconium silicate; the soft light frit comprises the following components in percentage by weight: 5-8% of alumina, 12-16% of quartz, 25-29% of potassium feldspar, 22-28% of calcite, 16-20% of barium carbonate and 9-12% of nepheline. The soft glazed tile matches the soft glaze with the digital protection glaze, not only has good soft effect, but also enables the glaze texture to be fine and smooth, realizes the texture of skin, and greatly reduces the deformation of the tile body.

Description

Soft glazed tile with skin texture and preparation method thereof

Technical Field

The invention relates to the technical field of ceramic tiles, in particular to a soft glazed tile with skin texture and a preparation method thereof.

Background

With the development of the domestic real estate industry, the demand of wall and floor tiles as a high-quality and low-price building decoration material is increasing day by day, and the glaze decoration effect of the wall and floor tiles is changing day by day. The soft light brick has comfortable, soft and non-dazzling light sensation effect, and can give people plain, natural and elegant visual feeling when being used for wall decoration, so that people can feel relaxed body and mind. Therefore, the unique and comfortable decoration style is popular with consumers, and a market trend is raised at home and abroad.

The soft glaze on the market is also called matt glaze, and can be divided into calcium soft glaze, barium soft glaze and magnesium soft glaze according to the components. A large amount of raw materials such as calcium, magnesium and the like are added into a glaze formula, so that fine crystal particles are separated out in the firing process, and the fine crystal particles enable light to be subjected to diffuse reflection, so that the glossiness of the glaze is reduced, but the glaze has slightly higher glossiness than the traditional matte glaze, and therefore, the glaze has a soft light effect.

The existing soft glaze can only ensure soft light sensation, and cannot ensure the smoothness of the texture of the glaze and the stable size of a brick body. On one hand, during the ceramic tile firing process, because the mineral raw materials are decomposed and the inner gap of the blank body can generate a small amount of gas, if the gas cannot be completely discharged during the firing process, obvious glaze defects can be caused. On the other hand, as the formula of the soft glaze contains a large amount of calcite, dolomite and barium carbonate raw materials, a large amount of gas is generated in the sintering process of the glaze layer, the gas cannot be completely discharged before the glaze layer is cooled, and finally exists on the surface of the ceramic tile in the form of the defect of 'pinholes' or 'miliaria', so that the texture of the ceramic tile is seriously influenced; meanwhile, due to the large loss of the raw materials, severe sintering shrinkage can be generated in the sintering process of the glaze layer, so that the final product is deformed; moreover, these drawbacks are even more serious, especially when the kiln firing cycle is shortened.

For example, publication No. CN1078982589A discloses a soft glaze formulation for ceramic sheets, in which calcite is used in an amount of 18% and barium carbonate is used in an amount of 10%, and the glaze formulation can exhibit soft glaze effect after firing, but severe glaze defects and blank deformation occur. For another example, publication No. CN106698940A discloses a soft glaze for soft antique bricks and a method for using the same, wherein the glaze is prepared by single-component oxide, so as to avoid gas generation during the sintering process of the glaze, but neglect gas generated by the green body, and the formula has a higher cost, theoretically requiring a higher sintering temperature and a longer sintering time. Also, as disclosed in publication No. CN106396738, a manufacturing method of a soft glazed tile realizes a soft effect by matching a high gloss overglaze with a low gloss ceramic ink, the final gloss of the prepared soft glazed tile is 60 °, the gloss of the product obtained by the process is relatively high, the light sensation effect is not soft, and the cost is relatively high.

Disclosure of Invention

The invention aims to provide a soft glazed tile with skin texture and a preparation method thereof aiming at the defects of the prior art, so that the obtained soft glazed tile can have a glaze surface with fine and smooth texture while ensuring an excellent soft effect, thereby realizing skin texture and greatly reducing the deformation of a tile body.

Based on the above, the invention discloses a soft glazed tile with skin texture, which is prepared by sequentially overlapping a green body, soft glaze and digital protective glaze; the soft glaze comprises soft glaze, wherein the soft glaze comprises the following components in percentage by weight: 30-35% of low-melting-point glass powder, 3-5% of anorthite, 5-7% of sillimanite, 4-7% of calcined alumina, 3-6% of montmorillonite, 5-8% of magnesite, 3-6% of calcined zinc oxide, 15-25% of soft frit and 14-18% of zirconium silicate;

the soft light frit comprises the following components in percentage by weight: 5-8% of alumina, 12-16% of quartz, 25-29% of potassium feldspar, 22-28% of calcite, 16-20% of barium carbonate and 9-12% of nepheline.

Preferably, the low-melting-point glass powder comprises the following components in percentage by weight: 17-21% of potassium oxide, 19-23% of sodium oxide, 24-28% of aluminum oxide, 10-15% of silicon oxide, 4-8% of calcium oxide and 14-20% of boron oxide; the component formula of the low-melting-point glass powder is optimized to further improve the texture of the glaze surface and the deformation of the brick body and realize quick firing.

Further preferably, the digital protective glaze is a digital protective glaze product provided by Shandong national porcelain Corritai New Material science and technology Co., Ltd and having a model number of Y1012 or Y1013; the digital protection glaze product is preferably selected, so that when the formula of the soft glaze disclosed by the invention is matched with the specific digital protection glaze for use, the glossiness of the required soft glazed tile can be more easily regulated and controlled, the texture of the soft glazed tile is finer and smoother, the antifouling property is more excellent, and the deformation of the tile body is less.

Preferably, the preparation steps of the soft frit are as follows: weighing the components according to the proportion, uniformly mixing, calcining to a molten state at 1300-1400 ℃, and carrying out cold water quenching treatment after calcining for 2-3h to obtain the soft light frit. Compared with the conventional raw material, the calcined material and the clinker also have wider sintering temperature range, and better meet the industry situation of 'quick sintering' in the current ceramic industry.

Preferably, the soft overglaze is prepared by the following steps: weighing the components according to the proportion, putting the components into a ball milling tank, adding water and an auxiliary agent, and carrying out ball milling until the size is 325 meshes and the residual is less than 0.6%; and adjusting the specific gravity and the flow rate of the ball-milled slurry to obtain the soft overglaze.

Further preferably, in the step of preparing the soft glaze, the auxiliaries are sodium carboxymethyl cellulose and sodium tripolyphosphate; the content of the water accounts for 30 percent of the mass of the soft glaze, the content of the sodium carboxymethyl cellulose accounts for 0.2 to 0.4 percent of the mass of the soft glaze, and the content of the sodium tripolyphosphate accounts for 0.4 to 0.7 percent of the mass of the soft glaze; the soft glaze has a specific gravity of 1.75-1.80g/cm and a flow rate (measured by a flow rate cup) of 28-35 s.

The invention also discloses a preparation method of the soft glazed tile with skin texture, which comprises the following preparation steps:

s1, pressing the blank powder into a blank body, and then drying;

step S2, applying soft glaze to the dried blank;

step S3, printing a pattern layer on the soft glaze;

step S4, printing a digital protection glaze on the pattern layer, and drying;

and step S5, sintering the blank after printing the digital protective glaze.

Preferably, in step S1, the blank is formed by pressing with a roller press. The blank is prepared by adopting a rolling mode with higher working pressure, and compared with the traditional punch forming, the rolled blank has better deformation resistance and exhaust performance.

Preferably, in the step S5, the sintering temperature 1170-1190 ℃ is performed for 30-45 min.

Preferably, in the step S2, the glazing manner of the soft-light overglaze is glaze spraying, and the glazing amount is 600-;

in the step S4, the glaze spraying amount of the digital protection glaze is 20-30g per square meter.

Compared with the prior art, the invention at least comprises the following beneficial effects:

the soft glazed tile adopts a new soft glazed glaze formula, and the use of the low-melting-point glass powder in the soft glazed glaze formula greatly reduces the initial melting point of a glaze layer, is beneficial to the gas discharge of a green body layer and the glaze layer on one hand, can enable the texture of the glaze layer to be finer and smoother, improves the deformation of a tile body, and on the other hand can shorten the firing period and realize quick firing; compared with the direct use of raw materials such as calcite, dolomite, barium carbonate and the like, the addition of the soft frit in the formula of the soft overglaze can ensure the soft effect, obviously reduce the gas generation amount in the firing process of the glaze layer and fundamentally avoid the glaze defect caused by the exhaust of the glaze layer and the brick body deformation caused by the firing shrinkage of the glaze layer. Therefore, in the soft glazed tile, the formula of the soft glazed tile can obtain a good soft effect (the glossiness is 11-20 ℃) through the synergistic cooperation of the low melting point glass powder and the soft glazed frit, and also can have a glaze surface with fine and smooth texture, so that the skin texture is realized, the deformation of the tile body can be greatly reduced, and the rapid firing (the firing period can be reduced to 30 min) can be realized. Meanwhile, when the formula of the soft glazed glaze is matched with the digital protection glaze for use, the gloss of the required soft glazed tile can be easily regulated, the texture of the soft glazed tile is finer and smoother, the antifouling performance is more excellent, and the deformation of the tile body is smaller.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments in order to make the above objects, features and advantages of the present invention more comprehensible.

Example 1

The preparation method of the soft glazed tile with skin texture of the embodiment comprises the following preparation steps:

(1) preparing a blank body: mixing the blank raw materials, ball-milling in a ball-milling tank until the fineness is not more than 325 meshes, removing iron, spray-drying to obtain blank powder with the particle size of 60-80 meshes and the water content of 5-7%, press-forming by a roller press (such as a constant force Tai HB33000 automatic hydraulic press), and drying to obtain the dried blank.

(2) Spraying soft glaze: applying soft surface glaze to the dried blank body in a glaze spraying mode, wherein the glaze application amount is 600g per square meter;

the soft glaze comprises a soft glaze, and the soft glaze comprises the following components in percentage by weight: 30% of low-melting-point glass powder, 4% of anorthite, 5% of sillimanite, 7% of calcined alumina, 3% of montmorillonite, 5% of magnesite, 6% of calcined zinc oxide, 25% of soft frit and 15% of zirconium silicate;

wherein the low-melting-point glass powder comprises the following components: 18% of potassium oxide, 20% of sodium oxide, 26% of aluminum oxide, 12% of silicon oxide, 4% of calcium oxide and 20% of boron oxide;

wherein, the soft light frit comprises the following components: 6% of alumina, 14% of quartz, 25% of potassium feldspar, 23% of calcite, 20% of barium carbonate and 12% of nepheline; the preparation method of the soft light frit comprises the following steps: weighing the raw materials according to the process, uniformly mixing, putting into a high-temperature furnace, calcining to a molten state, wherein the furnace temperature is 1360 ℃, the calcining time is 2.5h, discharging from a discharge port after calcining, and performing cold water quenching treatment to obtain a soft light frit;

wherein, the preparation of the soft glaze comprises the following steps: weighing the raw materials of the soft glaze according to the formula, putting the raw materials into a ball milling tank, adding 30% of water, 0.2% of sodium carboxymethyl cellulose and 0.4% of sodium tripolyphosphate (wherein, the contents of the water, the sodium carboxymethyl cellulose and the sodium tripolyphosphate are calculated by the mass percentage of the soft glaze, the same is carried out below), and ball milling until the 325-mesh sieve residue of the slurry is less than 0.6%; diluting the ball-milled slurry with water until the specific gravity is 1.75-1.80g/cm, and carrying out thin film evaporation on the slurry at a flow rate (measured by a flow cup, the same applies below) for 28-35 s.

(3) Printing a pattern layer: and printing a pattern layer on the soft overglaze.

(4) Printing a digital protection glaze: printing a digital protective glaze on the pattern layer, and drying; wherein the glaze spraying amount of the digital protection glaze is 20 g/square meter; the printing interval between the digital protection glaze layer and the pattern layer is 20s, and the drying time is 3 min; the digital protection glaze is a digital protection glaze product with the model number of Y1012 provided by Shandong China porcelain Conritai New Material science and technology Limited.

(5) And (3) firing: and (3) feeding the blank printed with the digital protective glaze into a kiln for sintering, wherein the sintering temperature is 1170 ℃, and the sintering period is 45min, so as to obtain the soft glazed tile of the embodiment.

Tests show that the gloss of the surface of the soft glazed tile is 11-13 degrees, the surface of the soft glazed tile has no pinholes, the texture of the surface of the soft glazed tile is fine and smooth, the soft glazed tile has skin texture, and the maximum deformation value of the tile body is 0.2 mm.

Example 2

The method for preparing a soft glazed tile with skin texture of the present embodiment refers to example 1, and the difference from example 1 is only that:

the digital protective glaze used in the step (4) is a digital protective glaze product with the model number of Y1013 provided by Shandong national porcelain Conritai New Material science and technology Limited.

Tests show that the gloss of the surface of the soft glazed tile is 15-18 degrees, the surface of the soft glazed tile has no pinholes, the texture of the surface of the soft glazed tile is fine and smooth, the soft glazed tile has the texture of skin, and the maximum deformation value of the tile body is 0.2 mm.

Example 3

The preparation method of the soft glazed tile with skin texture of the embodiment comprises the following preparation steps:

(1) preparing a blank body: mixing the blank raw materials, ball-milling in a ball-milling tank until the fineness is not more than 325 meshes, removing iron, then preparing the mixture into blank powder in a spray drying mode, wherein the grain diameter of the blank powder is 60-80 meshes, and the contained water content is 5% -7%, then performing compression molding by using a roller press (such as a constant force Tai HB33000 automatic hydraulic press), and drying to obtain a dried blank.

(2) Spraying soft glaze: applying soft and smooth surface glaze to the dried green body in a glazing way, wherein the glazing quantity is 680 g/square meter;

the soft glaze comprises a soft glaze, and comprises the following components: 33% of low-melting-point glass powder, 3% of anorthite, 7% of sillimanite, 5% of calcined alumina, 5% of montmorillonite, 7% of magnesite, 4% of calcined zinc oxide, 22% of soft frit and 14% of zirconium silicate;

wherein the low-melting-point glass powder comprises the following components: 17% of potassium oxide, 23% of sodium oxide, 28% of aluminum oxide, 10% of silicon oxide, 8% of calcium oxide and 14% of boron oxide;

wherein, the soft light frit comprises the following components: 5% of alumina, 12% of quartz, 27% of potassium feldspar, 28% of calcite, 18% of barium carbonate and 10% of nepheline; the preparation method of the soft light frit comprises the following steps: weighing the raw materials according to the process, uniformly mixing, putting into a high-temperature furnace, calcining to a molten state, wherein the furnace temperature is 1300 ℃, the calcining time is 3 hours, discharging from a discharge hole after calcining, and carrying out cold water quenching treatment to obtain the soft light frit;

wherein, the preparation of the soft glaze comprises the following steps: the raw materials of the soft glaze material are weighed according to the formula and put into a ball milling tank, 30 percent of water, 0.3 percent of sodium carboxymethyl cellulose and 0.5 percent of sodium tripolyphosphate are added, and the ball milling is carried out until the slurry is less than 0.6 percent of the slurry after being sieved by a 325-mesh sieve; diluting the ball-milled slurry with water until the specific gravity is 1.75-1.80g/cm, and carrying out thin film evaporation on the slurry until the flow rate is 28-35 s.

(3) Printing a pattern layer: and printing a pattern layer on the soft overglaze.

(4) Printing a digital protective glaze: printing a digital protective glaze on the pattern layer, and drying; wherein the glaze spraying amount of the digital protection glaze is 25g per square meter; the printing interval between the digital protective glaze layer and the pattern layer is 17s, and the drying time is 4 min; the digital protective glaze is a digital protective glaze product with the model number of Y1012 provided by Shandong national porcelain Kanglitai new material science and technology company Limited.

(5) And (3) firing: and (3) feeding the blank body printed with the digital protective glaze into a kiln to be sintered at the sintering temperature of 1190 ℃ for 30min to obtain the soft glazed tile of the embodiment.

Tests show that the gloss of the surface of the soft glazed tile is 13-15 degrees, the surface of the soft glazed tile has no pinholes, the texture of the surface of the soft glazed tile is fine and smooth, the soft glazed tile has the texture of skin, and the maximum deformation value of the tile body is 0.15 mm.

Example 4

The preparation method of the soft glazed tile with skin texture of the embodiment comprises the following preparation steps:

(1) preparing a blank body: mixing the blank raw materials, ball-milling in a ball-milling tank until the fineness is not more than 325 meshes, removing iron, then preparing into blank powder in a spray drying mode, wherein the grain diameter of the blank powder is 60-80 meshes, and the contained water content is 5-7%, then performing compression molding by using a roller press (such as a constant force Tai HB33000 automatic hydraulic press), and drying to obtain a dried blank.

(2) Spraying soft glaze: applying soft surface glaze to the dried blank body in a glaze spraying mode, wherein the glaze application amount is 700g per square meter;

wherein, the soft glaze comprises soft glaze, and the soft glaze comprises the following components: 35% of low-melting-point glass powder, 5% of anorthite, 6% of sillimanite, 4% of calcined alumina, 6% of montmorillonite, 8% of magnesite, 3% of calcined zinc oxide, 15% of soft light frit and 18% of zirconium silicate;

wherein the low-melting-point glass powder comprises the following components: 21% of potassium oxide, 19% of sodium oxide, 24% of aluminum oxide, 15% of silicon oxide, 6% of calcium oxide and 15% of boron oxide;

wherein, the soft light frit comprises the following components: 8% of aluminum oxide, 16% of quartz, 29% of potassium feldspar, 22% of calcite, 16% of barium carbonate and 9% of nepheline; the preparation method of the soft light frit comprises the following steps: weighing the raw materials according to the process, uniformly mixing, putting into a high-temperature furnace, calcining to a molten state, wherein the furnace temperature is 1400 ℃, the calcining time is 2 hours, discharging from a discharge hole after the calcining is finished, and carrying out cold water quenching treatment to obtain the soft light frit;

wherein, the preparation of the soft glaze comprises the following steps: the raw materials of the soft glaze material are weighed according to the formula and put into a ball milling tank, 30 percent of water, 0.4 percent of sodium carboxymethyl cellulose and 0.4 percent of sodium tripolyphosphate are added, and the ball milling is carried out until the slurry is less than 0.6 percent of the slurry after being sieved by a 325-mesh sieve; diluting the ball-milled slurry with water until the specific gravity is 1.75-1.80g/cm, and performing ethanol harvesting at flow rate for 28-35 s.

(3) Printing a pattern layer: and printing a pattern layer on the soft overglaze.

(4) Printing a digital protection glaze: printing a digital protection glaze on the pattern layer, and drying; wherein the glaze spraying amount of the digital protection glaze is 30g per square meter; the printing interval between the digital protective glaze layer and the pattern layer is 15s, and the drying time is 5 min; the digital protective glaze is a digital protective glaze product with the model number of Y1013 provided by Shandong national porcelain Kanglitai new material science and technology limited.

(5) And (3) firing: and (3) feeding the blank body printed with the digital protective glaze into a kiln for sintering, wherein the sintering temperature is 1180 ℃, and the sintering period is 37min, so as to obtain the soft glazed tile of the embodiment.

Tests show that the gloss of the surface of the soft glazed tile is 17-20 degrees, the surface of the soft glazed tile has no pinholes, the texture of the surface of the soft glazed tile is fine and smooth, the soft glazed tile has the texture of skin, and the maximum deformation value of the tile body is 0.25 mm.

Comparative example 1

A method for preparing a soft glazed tile in this comparative example is shown in example 1, and the method only differs from example 1 in that:

the soft overglaze used in step (2) of this comparative example was prepared by directly adding the respective components of the soft frit of example 1 in the form of green stock without subjecting the respective components to frit treatment (i.e., mixing, calcining to a molten state, and then subjecting the mixture to cold water quenching).

Tests show that the soft glazed tile of the comparative example has the tile surface glossiness of 15-18 degrees, obvious glaze pinholes, rough tile surface texture and the maximum tile deformation value of 0.7 mm.

Comparative example 2

A method for preparing a soft glazed tile in this comparative example is shown in example 1, and the method only differs from example 1 in that:

the soft overglaze used in step (2) of this comparative example was prepared by replacing the low-temperature glass frit of example 1 with conventional potassium feldspar.

Tests show that the soft glazed tile of the comparative example has tile surface glossiness of 13-16 degrees, obvious glaze pinholes, rough tile surface texture and maximum tile deformation value of 0.6 mm.

Comparative example 3

The preparation method of the soft glazed tile of the comparative example is shown in example 1, and the difference from the example 1 is only that:

in step (4), the comparative example was changed to a spray-on protective glaze, which was an existing conventional protective glaze (instead of the digital protective glaze of example 1) having the following components: 22% of potash feldspar, 13% of albite, 8% of alumina, 15% of kaolin, 8% of quartz, 4% of calcite, 5% of calcined talc, 5% of dolomite, 5% of zinc oxide and 15% of low-temperature frit.

Tests show that the gloss of the brick surface of the soft glazed brick of the comparative example is 12-15 degrees, a small number of pinholes are formed on the brick surface, the texture of the glaze is not fine enough, and the maximum deformation value of the brick body is 0.3 mm.

To sum up, compared with comparative examples 1 and 2, the formula of the soft glaze in the soft glazed tile in example 1 ensures excellent soft light effect and has a glaze surface with fine and smooth texture, so as to realize skin texture and greatly reduce deformation of the tile body by the synergistic cooperation of the low melting point glass powder and the soft frit.

Moreover, compared with comparative example 3, according to examples 1 to 2 and comparative example 3, it can be known that the sheen glazed tile of example 1 or 2 can realize large regulation and control of the glossiness of the sheen glazed tile by changing different digital protection glaze products without adjusting the formula components of the sheen glazed glaze through the matching of the sheen glazed glaze and the digital protection glaze. Therefore, when the soft glazed tile is used by matching the soft glazed glaze formula with the specific digital protection glaze, the glossiness of a required product can be more easily regulated and controlled.

While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the present invention.

The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (8)

1. A soft glazed tile with skin texture is characterized in that the soft glazed tile is prepared by sequentially overlapping a blank body, a soft glaze and a digital protective glaze; the soft glaze consists of soft glaze, water and an auxiliary agent, and the soft glaze comprises the following components in percentage by weight: 30-35% of low-melting-point glass powder, 3-5% of anorthite, 5-7% of sillimanite, 4-7% of calcined alumina, 3-6% of montmorillonite, 5-8% of magnesite, 3-6% of calcined zinc oxide, 15-25% of soft frit and 14-18% of zirconium silicate;

the soft light frit comprises the following components in percentage by weight: 5-8% of alumina, 12-16% of quartz, 25-29% of potassium feldspar, 22-28% of calcite, 16-20% of barium carbonate and 9-12% of nepheline;

the low-melting-point glass powder comprises the following components in percentage by weight: 17-21% of potassium oxide, 19-23% of sodium oxide, 24-28% of aluminum oxide, 10-15% of silicon oxide, 4-8% of calcium oxide and 14-20% of boron oxide;

the digital protection glaze is a digital protection glaze product with the model number of Y1012 or Y1013 provided by Shandong China porcelain Conritai New Material science and technology Limited.

2. The glazed tile with skin texture as claimed in claim 1, wherein the preparation of the glazed frit comprises: weighing the components according to the proportion, uniformly mixing, calcining to molten state at 1300-1400 ℃ for 2-3h, and after calcining and sintering, performing cold water quenching treatment to obtain the soft light frit.

3. A soft glazed tile with skin feel as claimed in claim 1, wherein the preparation step of the soft glaze is: weighing the components according to the raw material proportion of the soft glaze, putting the components into a ball milling tank, adding water and an auxiliary agent, and carrying out ball milling until the slurry is sieved by 325 meshes and the residual is less than 0.6%; and adjusting the specific gravity and the flow rate of the ball-milled slurry to obtain the soft overglaze.

4. The glazed tile with skin texture as claimed in claim 3, wherein in the step of preparing the glazed tile, the auxiliary agents are sodium carboxymethylcellulose and sodium tripolyphosphate; the content of the water accounts for 30 percent of the mass of the soft glaze, the content of the sodium carboxymethyl cellulose accounts for 0.2 to 0.4 percent of the mass of the soft glaze, and the content of the sodium tripolyphosphate accounts for 0.4 to 0.7 percent of the mass of the soft glaze;

the specific gravity of the soft overglaze is 1.75-1.80g/cm, and the flow rate of the soft overglaze measured by a flow rate cup is 28-35 s.

5. A method for preparing a soft glazed tile with skin texture, which is used for preparing the soft glazed tile with skin texture of any one of claims 1 to 4, and comprises the following preparation steps:

step S1, pressing the blank powder into a blank body, and then drying;

step S2, applying soft glaze to the dried blank;

step S3, printing a pattern layer on the soft overglaze;

step S4, printing a digital protection glaze on the pattern layer, and drying;

and step S5, sintering the blank after printing the digital protective glaze.

6. A method as claimed in claim 5, wherein in step S1, the blank is pressed and formed by a roller press.

7. The method as claimed in claim 5, wherein in step S5, the firing temperature is 1170-1190 ℃ and the firing time is 30-45 min.

8. The method for preparing a glazed tile with skin texture as claimed in claim 5, wherein in step S2, the glazing manner of the glazed tile is glaze spraying, and the glazing amount is 600-700 g/square meter;

in the step S4, the glaze spraying amount of the digital protection glaze is 20-30g per square meter.