Colored cover glaze, dark brick and preparation method of dark brick

Abstract

The invention provides colored cover glaze, a dark brick and a preparation method of the dark brick, and relates to the technical field of ceramic decorative bricks. The colored overglaze is prepared by the following steps: carrying out color separation treatment on a target design drawing plate to obtain a gray-scale layer; and adjusting the color of the basic cover glaze according to the gray-scale layer to obtain the colored cover glaze. According to the invention, the pigment is added into the cover glaze, so that the color of the cover glaze is matched with the color system of a product, and the cover glaze with a base color is formed before ink-jet printing, so that the ink outlet amount during ink jet can be effectively reduced, the defects of wiredrawing, splicing positions, color edges and the like possibly generated by an ink jet machine are obviously covered, the ink drying speed is accelerated, and the problems of ink discharge and pits are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic decorative bricks, in particular to a colored glaze, a dark brick and a preparation method thereof. Background Art

[0002] Dark-colored tiles are widely used to create a solemn space atmosphere due to their calm and solemn colors and noble texture, and are deeply loved by consumers. This kind of strong-colored tile not only has a strong visual impact, but also shows light luxury and temperament in home and engineering paving, becoming the preferred material for high-end decoration. However, the production process of dark-colored tiles faces a series of challenges, which mainly come from the depth of their color and the technical difficulties in the production process.

[0003] Existing dark-colored ceramic tile production technology usually involves an inkjet printing process, which allows for the precise reproduction of complex patterns and colors on the ceramic tile surface. However, due to the dark color of dark ceramic tiles, the amount of ink jet is relatively large, which leads to a variety of defects in the production process. These defects include color fringing, wire drawing, uneven joints, and uneven ink discharge, which seriously affect the aesthetics and product quality of the ceramic tile.

[0004] Color fringing refers to the uneven color at the edge of a tile, while brushing refers to the thin line of color marks that appear on the surface of a tile. The problem of splicing refers to the visual difference that occurs when multiple tiles are spliced ​​together, and uneven ink discharge will cause uneven color distribution on the surface of the tile. In addition, dark-colored tiles are prone to surface defects such as pits during the production process. These problems reduce the quality rate of the product and increase production costs.

[0005] In summary, the main defects of the existing dark-colored ceramic tile production technology include color edge, brushing, uneven joints, uneven ink discharge, and pits. These problems not only affect the appearance and texture of the ceramic tile, but also reduce the market competitiveness of the product. Therefore, improving the production quality rate of dark-colored ceramic tiles and reducing the above defects have become technical problems that need to be solved urgently in the industry. Solving these problems can not only improve the overall quality of the product, but also meet the market's growing demand for high-end dark-colored ceramic tiles.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a colored glaze, a dark brick and a preparation method thereof. The colored glaze reduces the actual amount of ink used during inkjet printing, solves the problem of many defects such as ink discharge and pits caused by the large amount of inkjet printing during the production of dark bricks, and also solves the problem of white drawing through the bottom during specific production.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] In a first aspect, the present invention provides a method for preparing a colored glaze, comprising:

[0010] The target design drawing is subjected to color separation processing to obtain a grayscale layer; and the color of the basic glaze is adjusted according to the grayscale layer to obtain the colored glaze.

[0011] In an optional embodiment, the method for preparing the colored glaze comprises:

[0012] Performing color separation on the target design drawing plate, and separating the grayscale layers into a base grayscale layer and a printing grayscale layer according to the color depth from light to dark;

[0013] Determining the color-adding ceramic pigment to be added to the basic glaze according to the base color grayscale layer, and preparing a glaze mixture;

[0014] Performing glazing treatment on the brick blank based on the glaze mixture to form a colored glaze surface on the surface of the brick blank;

[0015] In an optional embodiment, the glazing treatment includes any one of a spray glaze method and a pour glaze method.

[0016] In an optional embodiment, the color-additive ceramic pigment includes at least one of vanadium zirconium yellow, praseodymium yellow, golden brown, ferrozirconium red, vanadium zirconium blue, silver gray and cobalt black.

[0017] In an optional embodiment, the amount of the added color ceramic pigment is no more than 5% of the water glaze raw material of the basic glaze.

[0018] In an optional embodiment, the step of determining the color-adding ceramic pigment to be added to the basic glaze according to the base grayscale layer and preparing the glaze mixture comprises:

[0019] Determining the grayscale value of the base color grayscale layer, and determining the amount of the added color ceramic pigment according to the grayscale value;

[0020] The glaze mixture is prepared according to the color-adding ceramic pigment and the water glaze raw material of the basic glaze.

[0021] In an optional embodiment, the step of determining the grayscale value of the base grayscale layer; and determining the amount of the color-adding ceramic pigment to be added according to the grayscale value, comprises:

[0022] In the base color grayscale layer, select the point with the lightest color depth as the light color point;

[0023] Obtain the channel gray value percentage corresponding to each color channel of the light color point; wherein the color channels include a C channel, an M channel, a Y channel, a K channel, a wrapped yellow channel, and a wrapped red channel;

[0024] The channel gray value percentages of the C channel, the M channel, the Y channel, the K channel, the wrapped yellow channel and the wrapped red channel corresponding to the light color point are added to obtain the gray value of the light color point of the background gray layer;

[0025] According to the gray value, determining the dosage range of the color-adding ceramic pigment corresponding to the gray value, and determining the addition amount of the color-adding ceramic pigment according to the dosage range;

[0026] In an optional embodiment, the color depth of the colored glaze is less than the color depth of the light color system point;

[0027] In an optional embodiment, the dosage range of the color-adding ceramic pigment is determined by the following method:

[0028] A. If I≤5%, then 0.1%<C 色料 ≤0.3%;

[0029] B. If 5%<I≤10%, then 0.3%<C 色料 ≤0.5%;

[0030] C. If 10%<I≤15%, then 0.5%<C 色料 ≤0.7%;

[0031] D. If 15%<I≤20%, then 0.7%<C 色料 ≤1.0%;

[0032] E. If 20%<I≤30%, then 1.0%<C 色料 ≤1.3%;

[0033] F. If 30%<I≤40%, then 1.3%<C 色料 ≤2.0%;

[0034] G. If I>40%, then 2.0%<C 色料 ≤5.0%;

[0035] Wherein, I represents the gray value; C 色料 Represents the dosage range of the color-adding ceramic pigment.

[0036] In an optional embodiment, the glaze mixture is prepared according to the color-adding ceramic pigment and the water glaze raw material of the basic glaze, comprising:

[0037] Take the water glaze raw material, add the color-adding ceramic pigment while stirring and mixing;

[0038] The mixture is stirred and mixed continuously for 25 to 30 minutes to obtain the glaze mixture.

[0039] In a second aspect, the present invention further provides a colored glaze, which is prepared by the method for preparing the colored glaze as described above.

[0040] In a third aspect, the present invention further provides a method for preparing a dark brick, comprising:

[0041] According to the above-mentioned method for preparing colored glaze, a colored glaze is prepared on the surface of the brick;

[0042] Based on the target design drawing, inkjet printing is performed on the surface of the colored glaze, and then the dark brick is obtained after firing treatment;

[0043] In an optional embodiment, the firing temperature range of the firing treatment is 1175°C to 1200°C;

[0044] In an optional embodiment, the firing cycle of the firing treatment is 35 minutes to 50 minutes.

[0045] In a fourth aspect, the present invention further provides a dark brick prepared by the dark brick preparation method as described above.

[0046] The preparation method of the colored glaze provided by the present invention comprises color separation processing of the target design plate to obtain a grayscale layer; and adjusting the color of the basic glaze according to the grayscale layer to obtain the colored glaze. The present invention adds color to the basic glaze, and the color of the glaze is close to the product color system, and then performs inkjet printing on the basis of the base color on the surface of the glaze, which effectively reduces the amount of ink output during inkjet printing, can significantly cover the defects such as wire drawing, splicing, color edges, etc. produced by the inkjet machine, and reduces the amount of ink output, so that the ink can dry quickly after inkjet, reducing ink discharge and pit problems; and deepening the base color can also improve the thickness of dark brick products and increase the production quality rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 Schematic diagram of the process of preparing the colored glaze in the embodiment of the present application;

[0049] Figure 2 This is a surface morphology image of the dark brick product prepared in Example 4 of the present application;

[0050] Figure 3 This is a surface morphology diagram of the dark brick product prepared in Comparative Example 1 of the present application. DETAILED DESCRIPTION

[0051] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0052] The present application provides a method for preparing a colored glaze, comprising:

[0053] The target design drawing is subjected to color separation processing to obtain a grayscale layer; and the color of the basic glaze is adjusted according to the grayscale layer to obtain the colored glaze.

[0054] It should be noted that the basic glaze for dark bricks in the embodiments of the present application may include antique brick glaze and full-polished glaze, and may also include other glazes that can be glazed using the method in the present application.

[0055] As mentioned above, the target design board refers to the original image or design template used in ceramic tile production as a blueprint for the color and pattern of the final product. This board defines the color scheme, pattern layout and other visual elements of the tile, and is a key reference in the production process to ensure that the final product matches the design intent.

[0056] As mentioned above, the color separation processing method can use image processing software to separate the target design plate, and specifically, it can also be decomposed into different grayscale layers. Through color separation processing, the accuracy of color control can be improved, ensuring that the color and effect of the final product meet the design requirements, and the color can be adjusted more finely to reduce color difference and unevenness.

[0057] Specifically, image processing software such as Photoshop may be used to achieve color separation by adjusting color channels or using a grayscale tool.

[0058] As mentioned above, the color of the base glaze is adjusted according to the grayscale layer, that is, after the grayscale layer is obtained, the color of the base glaze is adjusted according to these layers. This means that according to the depth of the grayscale layer, an appropriate amount of colorant is added to the base glaze to match the color requirements of the design plate. The adjusted base glaze will have a color that matches the design plate, ready for the next step of inkjet printing. Through precise color matching, the color consistency and aesthetics of the final product can be improved. Reduce the amount of ink used in the inkjet printing process and reduce production costs. Specifically, the optimal ratio of colorant to base glaze can be determined through experiments, and then the colorant can be evenly dispersed in the glaze using an industrial disperser.

[0059] For further reference, Figure 1 The method for preparing the dark brick comprises:

[0060] Step S1, performing color separation processing on the target design drawing plate, and separating the grayscale layers into a base grayscale layer and a printing grayscale layer according to the color depth from light to dark;

[0061] Step S2, determining the color-adding ceramic pigment to be added to the basic glaze according to the base color grayscale layer, and preparing a glaze mixture;

[0062] Step S3, glazing the brick based on the glaze mixture to form a colored glaze on the surface of the brick;

[0063] Furthermore, the glazing treatment includes any one of a spray glaze method and a pour glaze method.

[0064] In the above-mentioned step S1, it is involved to use image processing software to decompose the target design plate into layers of different grayscales. These layers may include a base grayscale layer (the lightest) and a printing grayscale layer. The printing grayscale layer may be a single grayscale layer or a plurality of coatings of different depths, such as two, three, four, etc. For example, it may be a medium grayscale layer (the depth of the coating is relatively in the middle of the base grayscale layer and the high grayscale layer) and a high grayscale layer (the deepest), so as to obtain at least two layers of different grayscales, each layer representing a different color depth of the brick.

[0065] Through color separation, the accuracy of color control is improved to ensure that the color and effect of the final product meet the design requirements. Through layering, the color can be adjusted more finely to reduce color difference and unevenness. You can use image processing software such as Photoshop to achieve color separation by adjusting color channels or using grayscale tools.

[0066] In the above step S2, the type and proportion of colorant to be added to the base glaze is determined according to the gray value of the base gray layer to match the color requirements of the design plate, so that a glaze mixture matching the gray scale of the base color of the design plate can be prepared. Through accurate color matching, the color consistency and aesthetics of the final product can be improved. The amount of ink used in the inkjet printing process can be reduced, and the production cost can be reduced.

[0067] In the above step S3, the prepared glaze mixture is evenly applied to the surface of the brick to form a uniform base glaze, thereby forming a uniform base glaze on the surface of the brick to prepare for inkjet printing. This ensures that the color of the brick surface is uniform and consistent, improving the quality of the final product. It provides a uniform base for inkjet printing, ensuring the accuracy and clarity of the printed pattern.

[0068] Specifically, the glazing method may be any one of the following two processing methods:

[0069] (1) Spraying glaze method: use a high-pressure spray glaze cabinet with a pressure of 9 to 10 kg; 6 spray guns, 3 imported nozzle apertures of 0.52 and 3 of 0.43 mm, and a nozzle atomization angle of 130°; the blank temperature before glazing is 70 to 85°, the glazing specific gravity of the color glaze slurry: the standard specific gravity cup is 1.48 to 1.52, the glazing amount: the standard plate is 330 mm × 660 mm, 90 grams to 120 grams, and inkjet printing is performed after spraying the glaze.

[0070] (2) Glaze: Use bell jar glaze, specific gravity 1.82~1.92, glaze amount: standard plate 330mm×660mm, 90~120g, spray glaze and then perform inkjet printing.

[0071] Furthermore, the color-additive ceramic pigment includes at least one of vanadium zirconium yellow, praseodymium yellow, golden brown, ferrozirconium red, vanadium zirconium blue, silver gray and cobalt black.

[0072] The color-adding ceramic pigment mentioned above may be a mixture of a plurality of pigments, and the pigments may include but are not limited to yellow, brown, red, blue, gray and black.

[0073] It should be noted that the "base grayscale layer" does not only refer to the black and white layer, but also refers to the coating layers of different grayscales of the corresponding color system separated according to the color system of the target design plate. This means that when performing color separation processing, the colors in the original target design plate will be converted into corresponding grayscale values ​​to reflect the changes in their brightness.

[0074] Furthermore, the amount of the added coloring ceramic pigment is no more than 5% of the water glaze raw material of the basic glaze.

[0075] As mentioned above, it has been proved through experiments that when the color-additive ceramic pigment reaches 5%, it is added to the water-glaze raw material, and the dark brick product prepared has a slightly increased glaze pores and an increased glaze residue. When more than 5% is added, the glaze pores and glaze residue are significantly increased. Therefore, in the embodiments of the present application, the amount of color-additive ceramic pigment added is limited to no more than 5% of the water-glaze raw material of the basic glaze.

[0076] Furthermore, the step S2, determining the color-adding ceramic pigment to be added to the basic glaze according to the base color grayscale layer, and preparing the glaze mixture, comprises:

[0077] Step S21, determining the gray value of the base gray layer, and determining the amount of the color-adding ceramic pigment to be added according to the gray value;

[0078] The purpose of determining the amount of pigment added by determining the gray value is to ensure that the color of the base glaze matches the gray layer of the base color of the design plate. By accurately controlling the amount of pigment added, the color consistency of the final product can be guaranteed.

[0079] As mentioned above, in image processing, grayscale refers to the color brightness information of different channels of a pixel, ranging from 0 (black) to 255 (white). In the process of converting a color image to a grayscale image, the color information (red, green, blue) of each pixel is converted into a single grayscale value, which represents the brightness of the pixel. In the production of dark bricks, grayscale values ​​can be used to quantify the depth of color, thereby guiding the amount of colorant to be added.

[0080] By analyzing the grayscale value of the base grayscale layer, it is possible to determine how much colorant needs to be added to the base glaze to match the base color of the design plate. This is because the grayscale value provides a quantitative indicator of color depth, allowing producers to accurately adjust the amount of colorant to ensure that the color of the final product is as consistent as possible with the color of the design plate.

[0081] Step S22, preparing the glaze mixture according to the color-adding ceramic pigment and the water glaze raw material of the basic glaze.

[0082] In the above, according to the amount of colorant added determined in step S21, the colorant is mixed with the water glaze raw material of the basic glaze. This mixing process needs to be uniform and sufficient to ensure that the colorant is evenly distributed throughout the glaze, so that a uniform color effect can be obtained during glazing and inkjet printing.

[0083] Furthermore, the step S21, determining the gray value of the base gray layer; and determining the amount of the added color ceramic pigment according to the gray value, includes:

[0084] Step S211, in the background grayscale layer, select the point with the lightest color depth as the light color point; as mentioned above, in the background grayscale layer, find the point with the lightest color depth. This point represents the lightest part of the design. Thus, the light color point is determined, which is the basis for the subsequent calculation of the grayscale value. By selecting the lightest color point, it can be ensured that the lightest color will not be overly darkened during the color adjustment process, thereby maintaining the original intention of the design.

[0085] Specifically, image processing software (such as Photoshop) can be used to identify and select the lightest point. In the background grayscale layer, the lightest point can be determined by image processing software and used as the light color point. The color depth corresponding to each pixel in the image can be sorted to select the lightest point.

[0086] Step S212, obtaining the channel gray value percentage corresponding to each color channel of the light color point; wherein the color channels include a C channel, an M channel, a Y channel, a K channel, a wrapped yellow channel, and a wrapped red channel;

[0087] For the light color point determined in step S211, the gray value percentages of C (cyan), M (magenta), Y (yellow), K (black), yellow channel and red channel are obtained. By analyzing the gray values ​​of multiple channels, the depth of the color can be more accurately evaluated, thereby adjusting the color of the glaze more accurately.

[0088] Step S213, summing up the channel grayscale value percentages of the C channel, the M channel, the Y channel, the K channel, the wrapped yellow channel and the wrapped red channel corresponding to the light color point to obtain the grayscale value of the light color point of the base grayscale layer;

[0089] The gray value percentages of each channel obtained in step S212 are added together to obtain a total gray value. By adding the gray values ​​of multiple channels, a comprehensive color depth index can be obtained, which is very helpful for subsequent adjustment of the glaze color.

[0090] This can be achieved through simple mathematical calculations, for example: if the C channel grayscale value is 30%, the M channel is 10%, the Y channel is 5%, the K channel is 3%, the wrapped yellow and wrapped red channels are 1% each, then the total grayscale value is 50%.

[0091] Step S214, determining the dosage range of the color-adding ceramic pigment corresponding to the gray value according to the gray value, and determining the addition amount of the color-adding ceramic pigment according to the dosage range.

[0092] According to the gray value obtained in step S213, the dosage range of the coloring ceramic pigment is determined, and the specific addition amount is determined accordingly. By accurately controlling the addition amount of the pigment, the color of the glaze can be ensured to match the color of the design plate, while avoiding excessive pigment causing glaze quality problems.

[0093] Through these steps, it can be ensured that the color of the base glaze accurately matches the base gray layer of the design plate, so that in the subsequent glazing and firing process, dark bricks with consistent color and high quality can be produced. This method improves the accuracy of color control, reduces color difference and unevenness, and also improves production efficiency and market competitiveness of products.

[0094] Furthermore, the color depth of the colored glaze is less than the color depth of the light color point.

[0095] As mentioned above, the light color point in the design plate represents the lightest part of the color. If the color depth of the glaze exceeds this point, the color of the final product may be darker than the color of the design plate, resulting in color inconsistency. In addition, too dark a color may affect the aesthetics and practicality of the tile. For example, in interior decoration, too dark a color may make the space look oppressive. By limiting the color depth of the glaze, you can ensure that the color of the final product is more appropriate and popular.

[0096] In general, this limitation is to ensure that the color of the final product matches the design plate, while improving production efficiency, reducing costs, and ensuring product quality and aesthetics. By precisely controlling the color depth of the glaze, the needs of the market and consumers can be better met.

[0097] Furthermore, the dosage range of the color-additive ceramic pigment corresponding to the grayscale value is determined according to the grayscale value, and the dosage range of the color-additive ceramic pigment is determined by the following method:

[0098] A. If I≤5%, then 0.1%<C 色料 ≤0.3%;

[0099] B. If 5%<I≤10%, then 0.1%<C 色料 ≤0.3%;

[0100] C. If 10%<I≤15%, then 0.5%<C 色料 ≤0.6%;

[0101] D. If 15%<I≤20%, then 0.7%<C 色料 ≤1.0%;

[0102] E. If 20%<I≤30%, then 1.0%<C 色料 ≤1.3%;

[0103] F. If 30%<I≤40%, then 1.3%<C 色料 ≤2.0%;

[0104] G. If I>40%, then 2.0%<C 色料 ≤5.0%.

[0105] Wherein, I represents the gray value; C 色料 Represents the dosage range of the color-adding ceramic pigment.

[0106] In this embodiment, suitable optimal production data are studied through repeated experiments and data comparison and analysis. The range of the amount of the added ceramic pigment is determined based on the experimental results to ensure that the color and effect of the final product match the design plate.

[0107] Furthermore, the step S22, preparing the glaze mixture according to the color-adding ceramic pigment and the water glaze raw material of the basic glaze, comprises:

[0108] Step S221, taking the water glaze raw material, adding the color-adding ceramic pigment while stirring and mixing;

[0109] Step S222, continue stirring and mixing for 25 minutes to 30 minutes to obtain the glaze mixture.

[0110] The mixed materials can be stirred and processed in a disperser.

[0111] In addition, a colored glaze is also provided in an embodiment of the present application, which is prepared by the above-mentioned method for preparing the colored glaze.

[0112] In addition, a method for preparing dark bricks is also provided in an embodiment of the present application, comprising:

[0113] (1) Preparing a colored glaze on the surface of a brick according to the aforementioned method for preparing a colored glaze;

[0114] (2) Based on the target design drawing, inkjet printing is performed on the surface of the colored glaze, and then the dark brick is obtained after firing treatment; in the above-mentioned step of "based on the target design drawing, inkjet printing is performed on the surface of the colored glaze", an inkjet printer can be used to perform inkjet printing on the surface of the colored glaze with adjusted color according to the target design drawing. This step can directly transfer the pattern and color on the target design drawing to the surface of the brick, thereby obtaining dark bricks with precise patterns and colors, and the color and texture of these bricks are consistent with the design drawing.

[0115] Specifically, an inkjet printer can be used to perform inkjet printing on the base glaze according to the "printing grayscale layer" of the target design drawing (if split into 3 layers, the printing grayscale layer can include a medium grayscale layer and a high grayscale layer), and then solidify the pattern and color through a firing process to obtain dark bricks with precise patterns and colors, and the color and texture of these bricks are consistent with the design drawing.

[0116] In this step, high-resolution and complex pattern printing is achieved, improving the decorativeness and market competitiveness of the product. Inkjet printing technology allows for rapid design changes, improving production flexibility and efficiency.

[0117] Example 1

[0118] Experimental methods:

[0119] (1) obtaining a target design drawing, performing color separation processing on the target design drawing using Photoshop, and separating the grayscale layers into a base color grayscale layer and a printing grayscale layer according to the color depth from light to dark;

[0120] (2) in the background grayscale layer, determining the pixel point with the lightest color depth as the light color point;

[0121] (3) Obtain the channel gray value percentage corresponding to each color channel of the light color point; wherein the color channels include C channel, M channel, Y channel, K channel, wrapped yellow channel and wrapped red channel; the channel gray value percentage of each channel refers to the data in Table 1.

[0122] (4) Add the channel grayscale value percentages of the C channel, the M channel, the Y channel, the K channel, the wrapped yellow channel and the wrapped red channel corresponding to the light color point to obtain the grayscale value of the light color point of the background grayscale layer; the grayscale value results refer to the data in Table 1.

[0123] (5) determining the dosage range of the color-adding ceramic pigment corresponding to the gray value according to the gray value, and determining the amount of the color-adding ceramic pigment added according to the dosage range;

[0124] The dosage range of the color-adding ceramic pigment is determined by the following method:

[0125] A. If I≤5%, then 0.1%<C 色料 ≤0.3%;

[0126] B. If 5%<I≤10%, then 0.3%<C 色料 ≤0.5%;

[0127] C. If 10%<I≤15%, then 0.5%<C 色料≤0.7%;

[0128] D. If 15%<I≤20%, then 0.7%<C 色料 ≤1.0%;

[0129] E. If 20%<I≤30%, then 1.0%<C 色料 ≤1.3%;

[0130] F. If 30%<I≤40%, then 1.3%<C 色料 ≤2.0%;

[0131] G. If I>40%, then 2.0%<C 色料 ≤5.0%;

[0132] Wherein, I represents the gray value; C 色料 Represents the dosage range of the color-adding ceramic pigment.

[0133] The final amount of the color-adding ceramic pigment is determined by referring to the data in Table 1.

[0134] (6) The glaze mixture is prepared based on the color-adding ceramic pigment and the water glaze raw material of the basic glaze.

[0135] S7, glazing the brick based on the glaze mixture to form a basic glaze on the surface of the brick; the glazing method includes spraying glaze and pouring glaze.

[0136] S8, based on the target design plate, inkjet printing is performed on the surface of the base glaze according to the medium grayscale layer and the high grayscale layer, and then the dark brick is obtained after firing. The firing temperature range is 1180° C. and the firing cycle is 40 minutes.

[0137] Example 2

[0138] Experimental methods:

[0139] The method is basically the same as Example 1, except for the percentage of the channel grayscale value of each channel and the amount of the obtained color-adding ceramic pigment.

[0140] Example 3

[0141] Experimental methods:

[0142] The method is basically the same as Example 1, except for the percentage of the channel grayscale value of each channel and the amount of the obtained color-adding ceramic pigment.

[0143] Example 4

[0144] Experimental methods:

[0145] It is basically the same as Example 1, except for the channel gray value percentages of each channel and the dosage of the additive ceramic colorant obtained. Specifically, refer to Table 1.

[0146] Comparative Example 1

[0147] Experimental method:

[0148] It is basically the same as Example 1, except for the channel gray value percentages of each channel and the dosage of the additive ceramic colorant obtained. Among them, the dosage of the additive ceramic colorant is not obtained by referring to the corresponding relationship of A - G above and is an estimated value. Specifically, refer to Table 1.

[0149] Comparative Example 2

[0150] Experimental method:

[0151] It is basically the same as Example 1, except for the channel gray value percentages of each channel and the dosage of the additive ceramic colorant obtained. Among them, the dosage of the additive ceramic colorant is not obtained by referring to the corresponding relationship of A - G above and is an estimated value. Specifically, refer to Table 1.

[0152] Comparative Example 3

[0153] Experimental method:

[0154] It is basically the same as Example 1, except for the channel gray value percentages of each channel and the dosage of the additive ceramic colorant obtained. Among them, the dosage of the additive ceramic colorant is not obtained by referring to the corresponding relationship of A - G above and is an estimated value. Specifically, refer to Table 1.

[0155] Horizontal test:

[0156] Table 1. Additive parameters and results of the additive ceramic colorant

[0157]

[0158] In the above table, "Ex." represents "Example", and "Comp." represents "Comparative Example". For example, "Ex. 1" represents Comparative Example 1. Among them, the color systems of the additive ceramic colorants added in Examples 1 - 4 and Comparative Examples 1 - 3 are the same, the raw materials are the same, the ratios are the same, but the addition amounts are different.

[0159] Among them, the additive ceramic colorants in the examples and comparative examples are all vanadium zirconium blue, silver gray, and cobalt black, and the ratio is 2:1:0.3.

[0160] The glaze application method is all the spray surface glaze method. Specifically, it includes:

[0161] Use a high-pressure glaze spraying cabinet, pressure, 9kg, 6 spray guns, imported nozzle apertures 3 0.52mm, 3 0.43mm, nozzle atomization angle 130°, blank temperature before glazing 85°, glazing specific gravity of color glaze slurry: standard specific gravity cup 1.50, glazing amount: standard plate 330mm*660mm, 100 grams, inkjet printing after glazing.

[0162] Experimental results and analysis:

[0163] Based on the data in Table 1, in the embodiment, when the total amount of the added color ceramic pigment is within 5 grams per 100 grams of water glaze (basic glaze), the glaze quality has no significant effect. This shows that within this dosage range, the use of the added color ceramic pigment will not have a negative impact on the glaze, and the original quality and characteristics of the glaze can be maintained.

[0164] However, referring to the data in Table 1 and Figure 2 (Example 4), when the total amount of added coloring ceramic pigment reaches 5 grams, the glaze surface begins to show a slight increase in pores and glaze feces. This shows that after exceeding this threshold, the increase of pigment will have a negative impact on the quality of the glaze surface, resulting in visible defects on the glaze surface.

[0165] In Comparative Examples 1 to 3, the amount of the coloring ceramic pigment used was more than 5 g (e.g. Figure 3 , Comparative Example 1), there is a slight increase in glaze pores and glaze feces. This indicates that the amount of colorant used in the comparative example exceeds the safe range, resulting in glaze quality problems.

[0166] From the comparison between the embodiment and the comparative example, it can be seen that strictly controlling the amount of coloring ceramic pigment is crucial to maintaining the quality of the glaze. An appropriate amount of pigment can ensure the consistency and aesthetics of the glaze color, while an excessive amount of pigment will cause glaze defects and affect the overall quality of the product.

[0167] The method in the embodiment optimizes the glaze quality by precisely controlling the amount of colorant, while the method in the comparative example leads to serious quality problems due to the loss of control of the amount of colorant.

[0168] In summary, the method provided in the present application (such as Examples 1-4) adds color to the base glaze, and the color of the glaze is close to the product color system, and then inkjet printing is performed on the basis of the base color on the surface of the glaze, which effectively reduces the amount of ink output during inkjet printing, and can significantly cover the defects such as wire drawing, splicing, and color edges produced by the inkjet machine, and reduces the amount of ink output, so that the ink can dry quickly after inkjet, reducing ink discharge and pit problems; and deepening the base color can also increase the thickness of dark brick products and increase the production quality rate. This method not only improves the accuracy of color control, reduces color difference and unevenness, but also improves production efficiency and the market competitiveness of products. By accurately controlling the color depth of the glaze, the needs of the market and consumers can be better met, ensuring that the color of the final product matches the design drawing, while improving production efficiency, reducing costs, and ensuring the quality and aesthetics of the product.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a colored glaze, characterized in that: include: Performing color separation on the target design plate to obtain a grayscale layer; And the color of the basic glaze is adjusted according to the grayscale layer to obtain the colored glaze.

2. The method for preparing a colored glaze according to claim 1, characterized in that: include: Performing color separation on the target design drawing plate, and separating the grayscale layers into a base grayscale layer and a printing grayscale layer according to the color depth from light to dark; Determining the color-adding ceramic pigment to be added to the basic glaze according to the base color grayscale layer, and preparing a glaze mixture; Performing glazing treatment on the brick blank based on the glaze mixture to form a colored glaze surface on the surface of the brick blank; Preferably, the glazing treatment includes any one of a spray glaze method and a pour glaze method.

3. The method for preparing a colored glaze according to claim 2, characterized in that: The color-adding ceramic pigment comprises at least one of vanadium zirconium yellow, praseodymium yellow, golden brown, ferrozirconium red, vanadium zirconium blue, silver gray and cobalt black.

4. The method for preparing a colored glaze according to claim 2, characterized in that: The amount of the added color ceramic pigment is not more than 5% of the water glaze raw material of the basic glaze.

5. The method for preparing a colored glaze according to claim 2, characterized in that: The method of determining the color-adding ceramic pigment to be added to the basic glaze according to the base color grayscale layer and preparing the glaze mixture comprises: Determining the grayscale value of the base color grayscale layer, and determining the amount of the added color ceramic pigment according to the grayscale value; The glaze mixture is prepared according to the color-adding ceramic pigment and the water glaze raw material of the basic glaze.

6. The method for preparing a colored glaze according to claim 5, characterized in that: The step of determining the grayscale value of the base grayscale layer; and determining the amount of the added color ceramic pigment according to the grayscale value, comprises: In the base color grayscale layer, select the point with the lightest color depth as the light color point; Obtain the channel gray value percentage corresponding to each color channel of the light color point; wherein the color channels include a C channel, an M channel, a Y channel, a K channel, a wrapped yellow channel, and a wrapped red channel; The channel gray value percentages of the C channel, the M channel, the Y channel, the K channel, the wrapped yellow channel and the wrapped red channel corresponding to the light color point are added to obtain the gray value of the light color point of the background gray layer; According to the gray value, determining the dosage range of the color-adding ceramic pigment corresponding to the gray value, and determining the addition amount of the color-adding ceramic pigment according to the dosage range; Preferably, the color depth of the colored glaze is less than the color depth of the light color system point; Preferably, the dosage range of the color-adding ceramic pigment is determined by the following method: A. If I≤5%, then 0.1%<C 色料 ≤0.3%; B. If 5%<I≤10%, then 0.3%<C 色料 ≤0.5%; C. If 10%<I≤15%, then 0.5%<C 色料 ≤0.7%; D. If 15%<I≤20%, then 0.7%<C 色料 ≤1.0%; E. If 20%<I≤30%, then 1.0%<C 色料 ≤1.3%; F. If 30%<I≤40%, then 1.3%<C 色料 ≤2.0%; G. If I>40%, then 2.0%<C 色料 ≤5.0%; Wherein, I represents the gray value; C 色料 Represents the dosage range of the color-adding ceramic pigment.

7. The method for preparing a colored glaze according to claim 5, characterized in that: The glaze mixture is prepared according to the color-adding ceramic pigment and the water glaze raw material of the basic glaze, comprising: Take the water glaze raw material, add the color-adding ceramic pigment while stirring and mixing; The mixture is stirred and mixed continuously for 25 to 30 minutes to obtain the glaze mixture.

8. A colored glaze, characterized in that: The colored glaze is prepared by the method for preparing the colored glaze according to any one of claims 1 to 7.

9. A method for preparing dark bricks, characterized in that: include: The colored glaze is prepared on the surface of a brick according to the method for preparing a colored glaze according to any one of claims 2 to 7; Based on the target design drawing, inkjet printing is performed on the surface of the colored glaze, and then the dark brick is obtained after firing treatment; Preferably, the firing temperature of the firing treatment ranges from 1175°C to 1200°C; Preferably, the firing cycle of the firing treatment is 35 minutes to 50 minutes.

10. A dark brick, characterized in that: The dark brick is prepared by the method for preparing the dark brick as claimed in claim 9.

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