A colored glaze, a dark-colored brick and its preparation method

Abstract

This invention provides a colored glaze, a dark-colored brick, and a method for preparing the same, relating to the field of ceramic decorative brick technology. The colored glaze comprises: performing color separation processing on a target design template to obtain a grayscale layer; and adjusting the color of the base glaze according to the grayscale layer to obtain the colored glaze. This invention, by adding pigments to the glaze, ensures that the glaze color matches the product color scheme, forming a glaze with a base color before inkjet printing. This effectively reduces ink output during inkjet printing, significantly covers defects such as stringing, splicing, and color edges that may occur with inkjet printers, and accelerates ink drying, reducing ink runoff and pitting problems.

Description

Technical Field

[0001] This invention relates to the field of ceramic decorative tile technology, and more specifically, to a colored glaze, a dark-colored tile, and a method for preparing the same. Background Technology

[0002] Dark-colored tiles, with their calm and dignified colors and noble and elegant texture, are widely used to create a solemn spatial atmosphere and are deeply loved by consumers. These intensely colored tiles not only have a strong visual impact but also exude a sense of understated luxury and sophistication in both home and commercial paving, making them a preferred material for high-end decoration. However, the production process of dark-colored tiles faces a series of challenges, primarily stemming from the depth of their color and technical difficulties encountered during production.

[0003] Existing technologies for producing dark-colored ceramic tiles typically involve inkjet printing, a process that allows for the precise reproduction of complex patterns and colors on the tile surface. However, due to the deep color of dark ceramic tiles and the relatively large ink volume required, various defects are prone to occur during production. These defects include color edges, stringing, uneven splicing, and uneven ink distribution, all of which severely affect the aesthetics and product quality of the tiles.

[0004] Color edging refers to uneven color distribution at the edges of tiles, while streaking refers to fine, thread-like color marks on the tile surface. Joint issues refer to visual differences that occur when multiple tiles are joined together, while uneven ink distribution leads to uneven color distribution on the tile surface. Furthermore, dark-colored tiles are prone to surface defects such as pits during production, which reduce the yield rate and increase production costs.

[0005] In summary, the main defects in existing dark-colored ceramic tile production technology include issues such as color edges, stringing, uneven splicing, uneven ink distribution, and pits. These problems not only affect the aesthetics and texture of the tiles but also reduce the product's market competitiveness. Therefore, improving the yield rate of dark-colored ceramic tile production and reducing these defects has become an urgent technical challenge for the industry. Solving these problems will not only improve the overall quality of the products but also meet the growing market demand for high-end dark-colored ceramic tiles.

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

[0007] The purpose of this invention is to provide a colored glaze, a dark-colored brick, and a method for preparing the same. The colored glaze reduces the actual amount of ink used during inkjet printing, and solves the problem of numerous defects such as ink discharge and pits caused by the large amount of ink jetted during the production of dark-colored bricks. In addition, in actual production, it also solves the problem of white streaking through the bottom.

[0008] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

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

[0010] The target design template is processed by color separation to obtain a grayscale layer; and the color of the base 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 includes:

[0012] The target design template is processed by color separation, and the grayscale layer is separated into a base grayscale layer and a printing grayscale layer according to the color depth from light to dark;

[0013] Based on the aforementioned base grayscale layer, the colored ceramic pigments to be added to the base glaze are determined, and the glaze mixture is prepared.

[0014] The brick blank is glazed based on the glaze mixture to form a colored glaze surface on the brick blank.

[0015] In an optional embodiment, the glazing process includes either a spray glaze method or a pour glaze method.

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

[0017] In an optional embodiment, the amount of the added ceramic colorant is no more than 5% of the water-based glaze raw material of the base glaze.

[0018] In an optional embodiment, the step of determining the colored ceramic pigment to be added to the base glaze based on the base grayscale layer and preparing the glaze mixture includes:

[0019] Determine the grayscale value of the base grayscale layer, and determine the amount of the added color ceramic pigment based on the grayscale value;

[0020] The surface glaze mixture is prepared based on the colored ceramic pigment and the water-based glaze raw material of the base glaze.

[0021] In an optional implementation, determining the grayscale value of the base grayscale layer and determining the amount of added colorant ceramic pigment based on the grayscale value includes:

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

[0023] Obtain the percentage of grayscale value of each color channel corresponding to the light color point; wherein, the color channels include C channel, M channel, Y channel, K channel, yellow-envelope channel and red-envelope channel;

[0024] The grayscale values ​​of the C channel, M channel, Y channel, K channel, yellow-envelope channel, and red-envelope channel corresponding to the light-colored points are summed to obtain the grayscale value of the light-colored points in the base grayscale layer.

[0025] Based on the grayscale value, determine the dosage range of the ceramic pigment corresponding to the grayscale value, and determine the amount of ceramic pigment to be added based on the dosage range;

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

[0027] In an optional implementation, the dosage range of the colored ceramic pigment is determined using 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] Where I represents the grayscale value; C 色料 This represents the range of amounts of the added ceramic colorant used.

[0036] In an optional embodiment, the step of preparing the surface glaze mixture based on the colored ceramic pigment and the water-based surface glaze raw material includes:

[0037] Take the water-based glaze raw material and add the colored ceramic pigment while stirring and mixing;

[0038] Continue stirring and mixing for 25 to 30 minutes to obtain the surface glaze mixture.

[0039] Secondly, the present invention also provides a colored glaze, which is prepared by the colored glaze preparation method described above.

[0040] Thirdly, the present invention also provides a method for preparing dark-colored bricks, comprising:

[0041] A colored glaze is prepared on the surface of a brick blank according to the above-described method for preparing colored glaze;

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

[0043] In an optional embodiment, the firing temperature range of the firing treatment is 1175℃~1200℃;

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

[0045] Fourthly, the present invention also provides a dark-colored brick, which is prepared by the dark-colored brick preparation method described above.

[0046] The method for preparing colored glaze provided by this invention includes color separation processing of a target design plate to obtain a grayscale layer; and adjusting the color of the base glaze according to the grayscale layer to obtain the colored glaze. This invention adds color to the base glaze, making the glaze color close to the product color scheme. This allows for inkjet printing on the glaze surface with a base color, effectively reducing ink output during inkjet printing. It significantly covers defects such as stringing, splicing, and color edges caused by inkjet printers, and the reduced ink output allows the ink to dry quickly after inkjet printing, reducing ink runoff and pitting problems. Furthermore, deepening the base color enhances the sense of weight and depth in dark-colored brick products, increasing the production yield. Attached Figure Description

[0047] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0048] Figure 1 This is a schematic flowchart of the method for preparing colored glaze in the embodiments of this application;

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

[0050] Figure 3 This is a surface morphology image of the dark brick product prepared in Comparative Example 1 of this application. Detailed Implementation

[0051] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

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

[0053] The target design template is processed by color separation to obtain a grayscale layer; and the color of the base glaze is adjusted according to the grayscale layer to obtain the colored glaze.

[0054] It should be noted that the base glaze of the dark-colored bricks targeted in the embodiments of this application may include antique brick glaze and fully polished glaze, and may also include other glazes that can be applied using the methods in this application.

[0055] The aforementioned target design template refers to the original image or design template used in ceramic tile production as a blueprint for the final product's color and pattern. This template defines the tile's color scheme, pattern layout, and other visual elements, serving as a crucial reference during the production process to ensure that the final product matches the design intent.

[0056] The color separation processing described above can be performed using image processing software to separate the target design template into different grayscale layers. Color separation improves the precision of color control, ensuring that the final product's color and effect meet design requirements. It also allows for finer color adjustments, reducing color differences and unevenness.

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

[0058] The above describes adjusting the base glaze color based on grayscale layers. This means that after obtaining the grayscale layers, the base glaze color is adjusted according to these layers. This implies adding an appropriate amount of pigment to the base glaze based on the depth of the grayscale layers to match the color requirements of the design. The adjusted base glaze will have a color that matches the design, preparing it for the next step of inkjet printing. Precise color matching improves the color consistency and aesthetics of the final product, reduces ink usage during inkjet printing, and lowers production costs. Specifically, the optimal ratio of pigment to base glaze can be determined experimentally, and then an industrial disperser can be used to evenly disperse the pigment in the glaze.

[0059] Further reference Figure 1 The method for preparing the dark-colored bricks includes: including:

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

[0061] Step S2: Determine the colored ceramic pigment to be added to the base glaze based on the base gray layer, and prepare the glaze mixture.

[0062] Step S3: Apply glaze to the brick blank based on the glaze mixture to form a colored glaze surface on the brick blank.

[0063] Furthermore, the glazing process includes either a spray glaze method or a pour glaze method.

[0064] As described above, step S1 involves using image processing software to decompose the target design template into layers of different gray levels. These layers may include a base gray level (the lightest) and a printing gray level layer. The printing gray level layer can be a single gray level layer or multiple layers of different shades, such as two, three, four, etc. For example, it can be a medium gray level layer (the layer depth is relatively between the base gray level layer and the high gray level layer) and a high gray level layer (the darkest), resulting in at least two layers of different gray levels, each representing a different color depth of the brick.

[0065] Color separation improves the precision of color control, ensuring that the final product's color and effect meet design requirements. Layering allows for finer color adjustments, reducing color differences and unevenness. Color separation can be achieved using image processing software such as Photoshop, by adjusting color channels or using grayscale tools.

[0066] In step S2, as described above, the type and proportion of pigment to be added to the base glaze are determined based on the grayscale value of the base color layer to match the color requirements of the design template. This allows for the formulation of a glaze mixture that matches the grayscale of the base color of the design template. Precise color matching improves the color consistency and aesthetics of the final product. It also reduces ink usage during inkjet printing, lowering production costs.

[0067] As described above, step S3 involves uniformly applying the prepared glaze mixture to the surface of the brick blank to form a uniform base glaze, thus preparing the surface for inkjet printing. This ensures uniform color on the brick blank surface, improving the quality of the final product. It also provides a uniform base for inkjet printing, ensuring the accuracy and clarity of the printed pattern.

[0068] Specifically, the glazing process can be either of the following two methods:

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

[0070] (2) Glazing: Use a bell jar for glazing, with a specific gravity of 1.82 to 1.92. Glaze amount: 90 to 120 grams for a standard plate of 330mm × 660mm. After glazing, inkjet printing is performed.

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

[0072] The aforementioned colored ceramic pigments can be mixtures of various pigments, including but not limited to yellow, brown, red, blue, gray, and black.

[0073] It's important to note that the "base grayscale layer" doesn't simply refer to a black and white layer, but rather to layers of different grayscale levels corresponding to the color scheme of the target design template. This means that during color separation, the colors in the original target design template are converted into corresponding grayscale values ​​to reflect their changes in brightness.

[0074] Furthermore, the amount of the added ceramic colorant is no more than 5% of the water-based glaze raw material of the base glaze.

[0075] As demonstrated by the above experiments, when the amount of added ceramic pigment reaches 5%, the dark-colored brick product prepared by adding it to the water-based glaze raw material has a slight increase in glaze pores and glaze residue. When the amount added is more than 5%, the amount of glaze pores and glaze residue increases significantly. Therefore, in the embodiments of this application, the amount of added ceramic pigment is limited to no more than 5% of the water-based glaze raw material of the base glaze.

[0076] Further, in step S2, the colored ceramic pigment to be added to the base glaze is determined based on the base grayscale layer, and a glaze mixture is prepared, including:

[0077] Step S21: Determine the grayscale value of the base grayscale layer, and determine the amount of the added color ceramic pigment based on the grayscale value;

[0078] The above method, which determines the amount of pigment to be added by setting the grayscale value, aims to ensure that the color of the base glaze matches the grayscale layer of the design drawing. Precise control of the amount of pigment added guarantees color consistency in the final product.

[0079] As mentioned above, in image processing, grayscale value refers to the color brightness information of different channels of a pixel, ranging from 0 (black) to 255 (white). During the conversion of 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 that pixel. In the production of dark-colored bricks, grayscale values ​​can be used to quantify the depth of color, thereby guiding the amount of pigment added.

[0080] By analyzing the grayscale values ​​of the base color grayscale layer, it is possible to determine how much colorant needs to be added to the base glaze to match the background color of the design. This is because grayscale values ​​provide a quantifiable indicator of color depth, allowing producers to precisely adjust the amount of colorant to ensure that the color of the final product matches the design as closely as possible.

[0081] Step S22: Prepare the surface glaze mixture based on the colored ceramic pigment and the water-based glaze raw material of the base glaze.

[0082] As described above, according to the amount of pigment added determined in step S21, the colored ceramic pigment is mixed with the water-based glaze material of the base glaze. This mixing process needs to be uniform and thorough to ensure that the pigment is evenly distributed throughout the glaze, thereby achieving a uniform color effect during glazing and inkjet printing.

[0083] Further, step S21, determining the grayscale value of the base grayscale layer; and determining the amount of the added color ceramic pigment based on the grayscale 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, find the point with the lightest color depth in the background grayscale layer. This point represents the lightest part of the design drawing. This determines the light color point, which is the basis for subsequent grayscale value calculations. By selecting the lightest color point, it can be ensured that the lightest color will not be excessively darkened during color adjustment, thus maintaining the original design intent.

[0085] Specifically, image processing software (such as Photoshop) can be used to identify and select the lightest point. In a grayscale layer, image processing software can be used to determine the lightest point and designate it as the lightest color point. Alternatively, the color depth of each pixel in the image can be sorted to select the lightest point.

[0086] Step S212: Obtain the percentage of grayscale values ​​of each color channel corresponding to the light color point; wherein, the color channels include C channel, M channel, Y channel, K channel, wrapping yellow channel and wrapping red channel;

[0087] For the light-colored points identified in step S211, obtain their grayscale percentages in C (cyan), M (magenta), Y (yellow), K (black), the yellow-enclosing channel, and the red-enclosing channel. By analyzing the grayscale values ​​of multiple channels, the depth of color can be assessed more accurately, thereby allowing for more precise adjustment of the glaze color.

[0088] Step S213: Sum the percentage of gray values ​​of the C channel, M channel, Y channel, K channel, yellow-envelope channel and red-envelope channel corresponding to the light-colored point to obtain the gray value of the light-colored point in the base gray layer;

[0089] The percentage grayscale values ​​of each channel obtained in step S212 are summed to obtain a total grayscale value. By summing the grayscale values ​​of multiple channels, a comprehensive color depth index can be obtained, which is very helpful for subsequent adjustments to the surface 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%, and the yellow and red channels are each 1%, then the total grayscale value is 50%.

[0091] Step S214: Based on the grayscale value, determine the dosage range of the ceramic pigment corresponding to the grayscale value, and determine the amount of ceramic pigment added based on the dosage range.

[0092] Based on the grayscale value obtained in step S213, the range of amounts of colored ceramic pigment is determined, and the specific amount added is determined accordingly. By precisely controlling the amount of pigment added, it can be ensured that the color of the glaze matches the color of the design drawing, while avoiding glaze quality problems caused by excessive pigment.

[0093] These steps ensure that the color of the base glaze precisely matches the grayscale layer of the design blueprint, enabling the production of high-quality, uniformly colored dark tiles during subsequent glazing and firing processes. This method improves the precision of color control, reduces color differences and unevenness, and also enhances production efficiency and product market competitiveness.

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

[0095] As mentioned above, the light-colored dots in the design template represent the lightest parts of the color. If the glaze's depth exceeds this point, the final product's color may be darker than the design template, resulting in color inconsistency. Furthermore, excessively dark colors can negatively impact the tile's aesthetics and practicality. For example, in interior design, overly dark colors can make a space feel oppressive. By limiting the glaze's color depth, it's possible to ensure the final product's color is more suitable and appealing.

[0096] In general, this limitation is designed to ensure that the final product's color matches the design blueprint, while simultaneously improving production efficiency, reducing costs, and ensuring product quality and aesthetics. Precise control of the glaze's color depth allows for better fulfillment of market and consumer demands.

[0097] Furthermore, the step of determining the dosage range of the additive ceramic pigment corresponding to the grayscale value is carried out using 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] Where I represents the grayscale value; C 色料 This represents the range of amounts of the added ceramic colorant used.

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

[0107] Further, step S22, preparing the surface glaze mixture based on the colored ceramic pigment and the water-based glaze raw material, includes:

[0108] Step S221: Take the water-based glaze raw material and add the colored ceramic pigment while stirring and mixing;

[0109] Step S222: Continue stirring and mixing for 25 to 30 minutes to obtain the surface glaze mixture.

[0110] The aforementioned mixture can be stirred and processed in a disperser.

[0111] In addition, this application embodiment also provides a colored glaze, which is prepared by the above-described method for preparing colored glaze.

[0112] Furthermore, this application embodiment also provides a method for preparing dark-colored bricks, including:

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

[0114] (2) Based on the target design template, inkjet printing is performed on the surface of the colored glaze, followed by firing to obtain the dark-colored brick; In the step of "based on the target design template, inkjet printing is performed on the surface of the colored glaze according to the target design template," an inkjet printer can be used to perform inkjet printing on the colored glaze surface with adjusted colors, according to the target design template. This step can directly transfer the pattern and color on the target design template to the surface of the brick, thereby obtaining dark-colored bricks with accurate patterns and colors, whose colors and textures are consistent with the design template.

[0115] Specifically, an inkjet printer can be used to print "print grayscale layers" (if split into 3 layers, the print grayscale layers can include medium grayscale layers and high grayscale layers) on the base glaze. Then, the pattern and color are cured by firing, resulting in dark bricks with accurate patterns and colors that match the design.

[0116] This step enables the printing of high-resolution and complex patterns, enhancing the product's aesthetics and market competitiveness. Inkjet printing technology allows for rapid design changes, improving production flexibility and efficiency.

[0117] Example 1

[0118] Experimental methods:

[0119] (1) Obtain the target design template and use Photoshop to perform color separation processing on the target design template, separating the base grayscale layer and the printing grayscale layer from the grayscale layer according to the color depth from light to dark.

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

[0121] (3) Obtain the percentage of channel grayscale value corresponding to each color channel of the light color point; wherein, the color channel includes C channel, M channel, Y channel, K channel, wrapping yellow channel and wrapping red channel; the percentage of channel grayscale value of each channel is referenced in Table 1.

[0122] (4) Sum the percentage of channel grayscale values ​​of the C channel, M channel, Y channel, K channel, yellow wrapping channel and red wrapping 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 are referenced in the data in Table 1.

[0123] (5) Based on the gray value, determine the dosage range of the ceramic pigment corresponding to the gray value, and determine the amount of ceramic pigment added based on the dosage range;

[0124] The dosage range of the colored ceramic pigment is determined using 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] Where I represents the grayscale value; C 色料 This represents the range of amounts of the added ceramic colorant used.

[0133] The final amount of colored ceramic pigment to be used is determined by referring to the data in Table 1.

[0134] (6) The surface glaze mixture is prepared based on the colored ceramic pigment and the water-based glaze raw material of the base glaze.

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

[0136] S8, based on the target design template, inkjet printing is performed on the base glaze surface 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℃; the firing cycle is 40 minutes.

[0137] Example 2

[0138] Experimental methods:

[0139] The method is basically the same as in Example 1, except for the percentage of grayscale values ​​in each channel and the amount of colored ceramic pigment used. See Table 1 for details.

[0140] Example 3

[0141] Experimental methods:

[0142] The method is basically the same as in Example 1, except for the percentage of grayscale values ​​in each channel and the amount of colored ceramic pigment used. See Table 1 for details.

[0143] Example 4

[0144] Experimental methods:

[0145] The method is basically the same as in Example 1, except for the percentage of grayscale values ​​in each channel and the amount of colored ceramic pigment used. See Table 1 for details.

[0146] Comparative Example 1

[0147] Experimental methods:

[0148] The method is basically the same as in Example 1, except for the percentage of grayscale values ​​in each channel and the amount of colored ceramic pigment used. The amount of colored ceramic pigment used is estimated rather than determined by the aforementioned correspondence between A and G. See Table 1 for details.

[0149] Comparative Example 2

[0150] Experimental methods:

[0151] The method is basically the same as in Example 1, except for the percentage of grayscale values ​​in each channel and the amount of colored ceramic pigment used. The amount of colored ceramic pigment used is estimated rather than determined by the aforementioned correspondence between A and G. See Table 1 for details.

[0152] Comparative Example 3

[0153] Experimental methods:

[0154] The method is basically the same as in Example 1, except for the percentage of grayscale values ​​in each channel and the amount of colored ceramic pigment used. The amount of colored ceramic pigment used is estimated rather than determined by the aforementioned correspondence between A and G. See Table 1 for details.

[0155] Lateral testing:

[0156] Table 1. Parameters and Results of Adding Colored Ceramic Pigments

[0157]

[0158] In the table above, "Real" represents "Example" and "Comparative" represents comparative example. For example, "Real 1" represents Comparative Example 1. Among them, the added ceramic pigments in Examples 1-4 and Comparative Examples 1-3 have the same color system, the same raw materials, and the same proportions, but the amounts added are different.

[0159] In the examples and comparative examples, the colored ceramic pigments used were vanadium zirconium blue, silver gray, and cobalt black, in a ratio of 2:1:0.3.

[0160] All glazing methods employ a spray glaze application technique. Specifically, this includes:

[0161] High-pressure spray glazing cabinet, pressure 9kg, using 6 spray guns, imported printhead orifice diameters of 3 x 0.52mm and 3 x 0.43mm, nozzle atomization angle 130°, pre-glazing body temperature 85°, glaze slurry application specific gravity: standard specific gravity cup 1.50, glaze application amount: standard plate 330mm*660mm, 100g, inkjet printing after glazing.

[0162] Experimental results and analysis:

[0163] Based on the data in Table 1, in the examples, using 100 grams of water-based glaze (base glaze) as a unit, when the total amount of added ceramic pigment is less than 5 grams, the glaze quality is not significantly affected. This indicates that within this dosage range, the use of added ceramic pigment will not have a negative impact on the glaze and can maintain the original quality and characteristics of the glaze.

[0164] However, referring to the data in Table 1 and Figure 2 (Example 4) When the total amount of added ceramic colorant reached 5 grams, the glaze surface began to show a slight increase in pores and glaze residue. This indicates that exceeding this threshold will negatively impact the quality of the glaze surface, leading to visible defects.

[0165] In Comparative Examples 1 to 3, the amount of colored ceramic pigment used exceeded 5 grams (e.g. Figure 3 In Comparative Example 1), a slight increase in glaze pores and glaze residue was observed. This indicates that the amount of pigment used in the comparative example exceeded the safe range, leading to glaze quality issues.

[0166] The comparison between the examples and comparative examples shows that strictly controlling the amount of colored ceramic pigment is crucial for maintaining glaze quality. An appropriate amount of pigment ensures the consistency and aesthetics of the glaze color, while excessive pigment can lead to 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 pigment used, while the method in the comparative example leads to serious quality problems due to the uncontrolled amount of pigment used.

[0168] In summary, the method provided in this application (as in Examples 1-4) adds color to the base glaze, ensuring the glaze color closely matches the product's color scheme. Inkjet printing is then performed on the glaze surface with this base color, effectively reducing ink output during inkjet printing. This significantly conceals defects such as stringing, splicing, and color edges caused by inkjet printers, and the reduced ink output allows the ink to dry quickly after printing, minimizing ink runoff and pitting issues. Furthermore, deepening the base color enhances the sense of weight and solidity in dark-colored brick products, increasing the yield rate. This method not only improves the accuracy of color control and reduces color difference and unevenness but also increases production efficiency and product market competitiveness. By precisely controlling the color depth of the glaze, market and consumer demands can be better met, ensuring the final product's color matches the design specifications, while simultaneously improving production efficiency, reducing costs, and ensuring product quality and aesthetics.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to 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: The target design template is processed by color separation, and the grayscale layer is separated into the base grayscale layer and the printing grayscale layer according to the color depth from light to dark. The grayscale value of the base grayscale layer is determined, and the amount of ceramic pigment to be added is determined based on the grayscale value. Specifically, this includes: selecting the point with the lightest color depth in the base grayscale layer as a light color point; obtaining the percentage of channel grayscale values ​​corresponding to each color channel of the light color point; wherein the color channels include C channel, M channel, Y channel, K channel, yellow-encased channel, and red-encased channel; summing the percentage of channel grayscale values ​​of the C channel, M channel, Y channel, K channel, yellow-encased channel, and red-encased channel corresponding to the light color point to obtain the grayscale value of the light color point in the base grayscale layer; determining the range of amounts of ceramic pigment to be added corresponding to the grayscale value, and determining the amount of ceramic pigment to be added based on the range of amounts; the color depth of the colored glaze is less than the color depth of the light color point. The dosage range of the colored ceramic pigment is determined using 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%; Where I represents the grayscale value; C 色料 This represents the dosage range of the added color ceramic pigment; A surface glaze mixture is prepared based on the aforementioned colored ceramic pigment and the water-based glaze raw material of the base glaze; The brick blank is glazed based on the glaze mixture to form a colored glaze surface on the brick blank; the glazing process includes either spraying glaze or pouring glaze.

2. The method for preparing colored glaze as described in claim 1, characterized in that, The colored ceramic pigments include at least one of vanadium zirconium yellow, praseodymium yellow, golden brown, zirconium iron red, vanadium zirconium blue, silver gray, and cobalt black.

3. The method for preparing colored glaze as described in claim 1, characterized in that, The preparation of the surface glaze mixture based on the colored ceramic pigment and the water-based surface glaze raw material includes: Take the water-based glaze raw material and add the colored ceramic pigment while stirring and mixing; Continue stirring and mixing for 25 to 30 minutes to obtain the surface glaze mixture.

4. A colored glaze, characterized in that, The colored glaze is prepared by the method for preparing colored glaze as described in any one of claims 1-3.

5. A method for preparing dark-colored bricks, characterized in that, include: The method for preparing colored glaze according to any one of claims 1-3 yields a colored glaze on the surface of a brick blank. Based on the target design template, inkjet printing is performed on the surface of the colored glaze, and then the dark brick is obtained after firing.

6. The method for preparing dark-colored bricks as described in claim 5, characterized in that, The firing temperature range for the firing process is 1175℃~1200℃.

7. The method for preparing dark-colored bricks as described in claim 5, characterized in that, The firing cycle for the firing process is 35 to 50 minutes.

8. A dark-colored brick, characterized in that, It is prepared by the method for preparing dark bricks as described in any one of claims 5-7.

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