Colored inorganic artificial stone as well as preparation method and color matching method thereof

Abstract

The invention provides a colored inorganic artificial stone and a preparation method and a color matching method thereof.The preparation method comprises the following steps that S1, graded aggregate and inorganic toner are put into a stirring machine to be subjected to dry mixing and stirring, then water, a water reducing agent, white cement, metakaolin and emulsion are put into the stirring machine to be stirred, and a mixture is obtained; wherein the graded aggregate comprises calcium sand of 5 meshes, calcium sand of 20 meshes, calcium sand of 40 meshes, calcium sand of 60 meshes, calcium sand of 80 meshes, calcium sand of 100 meshes and calcium powder of 325 meshes; s2, the mixture is placed in a mold to be subjected to compression molding, and a rough board is obtained; and S3, the rough board is subjected to maintenance and grinding and polishing in sequence, and the colored inorganic artificial stone is obtained. The preparation process is simple, the high-quality colored inorganic artificial stone which is saturated and uniform in color and fine and smooth in texture can be prepared, and toner pre-dispersion equipment does not need to be depended on.

Description

Technical Field

[0001] This invention relates to the field of inorganic artificial stone technology, and in particular to a colored inorganic artificial stone and its preparation and color matching methods. Background Technology

[0002] As an important building decoration material, the color performance of inorganic artificial stone is one of the key factors determining its market competitiveness. Currently, the color matching technology of inorganic artificial stone mainly revolves around how to achieve color uniformity and accuracy.

[0003] In industrial production, to achieve precise color control of inorganic artificial stone, the industry generally adopts color matching technology based on theoretical models. For example, this involves establishing complex mathematical and physical equations or using spectral analysis equipment to quantitatively analyze colors, aiming to achieve precise color matching with a color difference (ΔE) of less than or equal to 1.5. However, this approach has significant limitations: firstly, it relies on expensive professional testing equipment and color matching software, resulting in high fixed asset investment costs; secondly, it requires professional color science theory training for operators, creating a high technical barrier. This makes this technology a heavy economic burden for most small and medium-sized artificial stone production enterprises, hindering its widespread application.

[0004] As an alternative, many businesses, especially small and medium-sized enterprises (SMEs), rely on experienced technicians to manually adjust colors by eye. While this method has low equipment costs, it is essentially a trial-and-error process, with significant uncertainty and subjectivity. Experienced technicians need to repeatedly adjust the pigment ratios based on experience, conducting numerous small-scale trials until the color approximates the target. This process is inefficient, has a long production cycle, and the results heavily depend on individual experience, making it difficult to standardize data. Furthermore, if these technicians leave, the color-adjusting techniques risk being lost.

[0005] Whether it's high-end precision color matching or traditional experience-based color mixing, both face a common technical bottleneck in the initial stage of production—color powder dispersion: to ensure the color powder is evenly dispersed in the stone matrix and to avoid color clumps or spots that affect the appearance of the finished product, traditional processes must rely on additional pre-treatment equipment, such as roller brushes or specialized color powder grinding equipment, to pre-disperse the color powder. This additional step not only increases equipment investment and energy consumption but also makes the process more complex and adds more quality control points.

[0006] Therefore, there is an urgent need to provide a colored inorganic artificial stone, its preparation method, and its color matching method. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a colored inorganic artificial stone and its preparation method and color matching method. The preparation process is simple and can produce high-quality colored inorganic artificial stone with saturated and uniform color and delicate texture, without relying on color powder pre-dispersion equipment.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0011] In a first aspect, the present invention provides a method for preparing colored inorganic artificial stone, comprising the following steps:

[0012] S1. Add graded aggregates and inorganic color powder to a mixer for dry mixing, then add water, water-reducing agent, white cement, metakaolin and emulsion to the mixer for mixing to obtain a mixture;

[0013] Among them, the graded aggregates include 5 mesh calcium sand, 20 mesh calcium sand, 40 mesh calcium sand, 60 mesh calcium sand, 80 mesh calcium sand, 100 mesh calcium sand and 325 mesh calcium powder.

[0014] S2. Place the mixture in a mold and press it to form a rough sheet;

[0015] S3. The rough slabs are successively cured and polished to obtain colored inorganic artificial stone.

[0016] Optionally, in S1, by weight, there are 0.1-0.5 parts of inorganic color powder, 1-2 parts of water, 1-2 parts of water-reducing agent, 20-35 parts of inorganic cementitious material, 0-10 parts of emulsion, and graded aggregates including 5-10 parts of 5-mesh calcium sand, 1-5 parts of 20-mesh calcium sand, 1-10 parts of 40-mesh calcium sand, 10-20 parts of 60-mesh calcium sand, 20-25 parts of 80-mesh calcium sand, 10-20 parts of 100-mesh calcium sand, and 1-5 parts of 325-mesh calcium powder.

[0017] Optionally, the graded aggregate includes 7-10 parts of 5-mesh calcium sand, 1-3 parts of 20-mesh calcium sand, 4-7 parts of 40-mesh calcium sand, 13-20 parts of 60-mesh calcium sand, 20-25 parts of 80-mesh calcium sand, 10-15 parts of 100-mesh calcium sand, and 2-4 parts of 325-mesh calcium powder.

[0018] Optionally, the inorganic cementing material is a mixture of 525-mesh white cement and metakaolin, with 20-30 parts white cement and 0-5 parts metakaolin by weight.

[0019] Optionally, in S1, after the graded aggregate and inorganic color powder are put into the mixer for dry mixing for 1-2 minutes, the water-reducing agent and water are first put into the mixer and mixed for 2-3 minutes, then the inorganic cementitious material is put into the mixer and mixed for 3-5 minutes, and finally the emulsion is put into the mixer and mixed for 3-5 minutes.

[0020] Optionally, the inorganic pigment is a compound of at least two of iron oxide red, iron oxide yellow, iron oxide black and titanium dioxide.

[0021] Optionally, the water-reducing agent is an HSP-V type polycarboxylate high-efficiency water-reducing agent with a solid content of 30% and a water reduction rate of 25%, and the emulsion is a styrene-butadiene emulsion.

[0022] Optionally, in S2, the mixture is placed in a mold for vacuum pressing, with a vacuum degree of 0.1 MPa, a press holding time of 120-180 s, and a press pressure of 40-45 MPa; in S3, the curing temperature is 20℃-40℃, the curing humidity is ≥95%, and the curing time is 6-8 days.

[0023] Secondly, the present invention provides a colored inorganic artificial stone, which is prepared by the above-mentioned method for preparing colored inorganic artificial stone.

[0024] Thirdly, the present invention provides a method for color matching of customized colored inorganic artificial stone, comprising the following steps:

[0025] A1. Based on the gradient of pigment ratios, the above preparation method is used to prepare inorganic artificial stone under each pigment ratio gradient. The inorganic artificial stone under each pigment ratio gradient forms an inorganic artificial stone color gradation plate. The color gradation plate has multiple color block areas, and each color block area corresponds to a specific pigment ratio.

[0026] A2. Based on the proportion of color powder corresponding to the target color block area selected by the user from the color scale, colored inorganic artificial stone is prepared using the above preparation method.

[0027] (III) Beneficial Effects

[0028] The beneficial effects of this invention are:

[0029] The method for preparing colored inorganic artificial stone provided by this invention optimizes the aggregate system, enabling it to function as both a skeletal support and a grinding medium during the mixing process, thus achieving efficient and uniform dispersion of inorganic color powder. By precisely controlling the material addition sequence, mixing time, vacuum pressing parameters, and multi-stage polishing process, high-quality colored inorganic artificial stone with saturated and uniform color, delicate texture, and no visible defects is successfully prepared. This method is simple, easy to industrialize, and does not require complex color powder pre-dispersion equipment. Attached Figure Description

[0030] Figure 1 This is a schematic flowchart of a method for preparing colored inorganic artificial stone according to a specific embodiment of the present invention. Detailed Implementation

[0031] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] This invention provides a method for preparing colored inorganic artificial stone, such as... Figure 1 As shown, it includes the following steps:

[0033] S1. Add graded aggregates and inorganic color powder to a mixer for dry mixing, then add water, water-reducing agent, white cement, metakaolin and emulsion to the mixer for mixing to obtain a mixture.

[0034] Preferably, the graded aggregate includes 5-mesh calcium sand, 20-mesh calcium sand, 40-mesh calcium sand, 60-mesh calcium sand, 80-mesh calcium sand, 100-mesh calcium sand, and 325-mesh calcium powder. This graded aggregate, during dry mixing, can effectively shear and grind inorganic pigment clumps, ensuring uniform dispersion of the pigment and facilitating highly uniform dispersion of the pigment in the final product.

[0035] Preferably, after dry mixing the graded aggregates and inorganic color powder in a mixer for 1-2 minutes, the water-reducing agent and water are added and mixed for 2-3 minutes to fully dissolve the water-reducing agent and wet the aggregate surface. Then, the inorganic cementitious material is added and mixed for 3-5 minutes to ensure the cementitious material slurry fully coats the aggregates and color powder. Finally, the emulsion is added and mixed for 3-5 minutes to ensure uniform distribution of the emulsion and improve the molding performance of the mixture. Specific feeding sequences and mixing times are beneficial to the uniformity of mixture distribution and molding performance.

[0036] In a preferred embodiment, the components are in the following amounts by weight: 0.1-0.5 parts inorganic color powder, 1-2 parts water, 1-2 parts water-reducing agent, 20-35 parts inorganic cementitious material, 0-10 parts emulsion, and graded aggregate including 5-10 parts of 5-mesh calcium sand, 1-5 parts of 20-mesh calcium sand, 1-10 parts of 40-mesh calcium sand, 10-20 parts of 60-mesh calcium sand, 20-25 parts of 80-mesh calcium sand, 10-20 parts of 100-mesh calcium sand, and 1-5 parts of 325-mesh calcium powder.

[0037] More preferably, the graded aggregate comprises 7-10 parts of 5-mesh calcium sand, 1-3 parts of 20-mesh calcium sand, 4-7 parts of 40-mesh calcium sand, 13-20 parts of 60-mesh calcium sand, 20-25 parts of 80-mesh calcium sand, 10-15 parts of 100-mesh calcium sand, and 2-4 parts of 325-mesh calcium powder. This proportioned graded aggregate further improves the aggregate's shearing and grinding properties against inorganic pigment agglomerates, resulting in more uniform pigment dispersion.

[0038] Specifically, the inorganic cementing material is a mixture of 525-mesh white cement and metakaolin, with 20-30 parts white cement and 0-5 parts metakaolin by weight. The 525-mesh white cement can be 525-mesh silicate cement.

[0039] Specifically, the water-reducing agent is HSP-V type polycarboxylate high-efficiency water-reducing agent with a solid content of 30% and a water reduction rate of 25%, and the emulsion is styrene-butadiene emulsion.

[0040] Specifically, the inorganic pigment is a compound of at least two of iron oxide red, iron oxide yellow, iron oxide black and titanium dioxide.

[0041] S2. Place the mixture in a mold and press it to form a rough board.

[0042] Preferably, vacuum pressing is used, with a vacuum degree of -0.1 MPa, a press pressure of 40-45 MPa, and a holding time of 120-180 seconds. Under high vacuum and high pressure, air bubbles in the mixture can be effectively eliminated, making the materials densely bonded, thereby obtaining a rough sheet with high strength and excellent surface quality.

[0043] S3. The rough slabs are successively cured and polished to obtain colored inorganic artificial stone.

[0044] Preferably, the curing temperature is 20℃-40℃, the curing humidity is ≥95%, and the curing time is 6-8 days. These curing conditions are conducive to the full hydration of the cementitious material, ensuring that the artificial stone achieves optimal mechanical properties.

[0045] Specifically, after the curing is completed, the rough board is ground and polished to a fixed thickness. Specifically, under the condition of fixed thickness, it is successively ground with 30 grit, 50 grit, and 100 grit for coarse grinding, 300 grit, 500 grit, and 800 grit for fine grinding, and 2000 grit for fine polishing. After the treatment, the surface of the material has no obvious scratches or pitting.

[0046] The method for preparing colored inorganic artificial stone provided by this invention optimizes the aggregate system, enabling it to function as both a skeletal support and a grinding medium during the mixing process, thus achieving efficient and uniform dispersion of inorganic color powder. By precisely controlling the material addition sequence, mixing time, vacuum pressing parameters, and multi-stage polishing process, high-quality colored inorganic artificial stone with saturated and uniform color, delicate texture, and no visible defects is successfully prepared. This method is simple, easy to industrialize, and does not require complex color powder pre-dispersion equipment.

[0047] This invention also provides a colored inorganic artificial stone, prepared by the method described above. The inorganic color powder in this artificial stone is highly dispersed in a matrix formed by graded aggregates and cementitious materials, resulting in a product surface free of visible color clumps or spots and possessing a smooth and bright texture.

[0048] Furthermore, the present invention also provides a color matching method for customizing colored inorganic artificial stone, comprising the following steps:

[0049] A1. Based on the preset gradient of color powder ratios, inorganic artificial stone under each color powder ratio gradient is prepared using the preparation method described above. The inorganic artificial stone under each color powder ratio gradient is used to form an inorganic artificial stone color gradation plate.

[0050] Specifically, after filling different areas of the mold with mixtures of different color powder proportions, a color gradation plate is obtained by pressing in one step. The different areas of the mold are mutually separated areas that can form independent color blocks.

[0051] The resulting color gradation chart has multiple color block areas, each corresponding to a specific proportion of pigments, resulting in natural color transitions and distinct layers.

[0052] A2. Based on the target color area selected by the user from the color scale chart above, determine the corresponding specific color powder ratio. Then, using the preparation method described above and the determined color powder ratio, a colored inorganic artificial stone product with the same color as the target color area selected by the user can be prepared.

[0053] The color matching method provided by this invention constructs an intuitive visual comparison system by preparing a physical color gradation plate that is completely consistent with the material and process of the final product. This successfully avoids the dependence on expensive spectroscopic equipment and complex theoretical models in existing technologies, while solving the uncertainty and difficulty in passing on the traditional "experience-based color matching method". This method solidifies the abstract proportion of pigments into a standardized physical reference system, transforming the color matching process from a "trial and error" process relying on personal experience into a standardized industrial process of "comparison-selection-replication". Thus, without the need for major equipment investment and professional training, it achieves low-cost, high-efficiency, and highly deterministic color customization and accurate reproduction, significantly reducing the technical threshold for production, shortening the production cycle, and improving market responsiveness.

[0054] Example 1

[0055] By weight, the basic raw material composition is as follows: 8 parts of 5-mesh calcium sand, 2 parts of 20-mesh calcium sand, 5 parts of 40-mesh calcium sand, 15 parts of 60-mesh calcium sand, 20 parts of 80-mesh calcium sand, 13 parts of 100-mesh calcium sand, 3 parts of 325-mesh calcium powder, 1 part of HSP-V type polycarboxylate high-efficiency water-reducing agent, 1.2 parts of water, 23 parts of 525-mesh white cement, 3 parts of metakaolin, and 5 parts of styrene-butadiene emulsion.

[0056] To investigate the effect of pigment ratio on color, six groups of inorganic pigments with different mass ratios were set up, specifically:

[0057] Group 1: 0.10 parts titanium dioxide, 0.00 parts iron oxide red;

[0058] Group 2: 0.08 parts titanium dioxide, 0.02 parts iron oxide red;

[0059] Group 3: 0.06 parts titanium dioxide, 0.04 parts iron oxide red;

[0060] Group 4: 0.04 parts titanium dioxide, 0.06 parts iron oxide red;

[0061] Group 5: 0.02 parts titanium dioxide, 0.08 parts iron oxide red;

[0062] Group 6: 0.00 parts titanium dioxide, 0.10 parts iron oxide red.

[0063] The preparation method is as follows:

[0064] S1. Add the graded aggregate and the corresponding inorganic color powder to the mixer and dry mix for 2 minutes. Then add the water-reducing agent and water, and mix for 3 minutes. Next, add the white cement and metakaolin, and mix for 5 minutes. Finally, add the styrene-butadiene emulsion and mix for 5 minutes to obtain a uniform mixture.

[0065] S2. Place the mixture in a mold and press it into shape under a vacuum of 0.1MPa and a pressure of 40MPa, holding the pressure for 180s to obtain a rough board.

[0066] S3. Cur the raw board at 20℃ and humidity ≥95% for 7 days. After curing, perform fixed-thickness grinding and polishing, successively through 30-grit, 50-grit, and 100-grit coarse grinding, 300-grit, 500-grit, and 800-grit fine grinding, and 2000-grit fine polishing.

[0067] Six groups of colored inorganic artificial stone samples with corresponding color powder ratios were prepared according to the above method, and their performance was tested. All samples exhibited the following characteristics: smooth and bright surface, free of defects such as color patches and spots, and uniform color distribution; 60° gloss level was not lower than 85 GU; compressive strength was higher than 60 MPa; and the color difference ΔE between samples was less than 1.0 after repeated preparation with the same ratio, indicating that this method has excellent color reproducibility.

[0068] Example 2

[0069] By weight, the basic raw material composition is as follows: 8 parts of 5-mesh calcium sand, 2 parts of 20-mesh calcium sand, 5 parts of 40-mesh calcium sand, 15 parts of 60-mesh calcium sand, 20 parts of 80-mesh calcium sand, 13 parts of 100-mesh calcium sand, 3 parts of 325-mesh calcium powder, 1 part of HSP-V type polycarboxylate high-efficiency water-reducing agent, 1.2 parts of water, 23 parts of 525-mesh white cement, 3 parts of metakaolin, and 5 parts of styrene-butadiene emulsion.

[0070] To investigate the effect of pigment ratio on color, six groups of inorganic pigments with different mass ratios were set up, specifically:

[0071] Group 1: 0.10 parts titanium dioxide, 0.00 parts iron oxide black;

[0072] Group 2: 0.08 parts titanium dioxide, 0.02 parts iron oxide black;

[0073] Group 3: 0.06 parts titanium dioxide, 0.04 parts iron oxide black;

[0074] Group 4: 0.04 parts titanium dioxide, 0.06 parts iron oxide black;

[0075] Group 5: 0.02 parts titanium dioxide, 0.08 parts iron oxide black;

[0076] Group 6: 0.00 parts titanium dioxide, 0.10 parts iron oxide black.

[0077] The preparation method is the same as in the examples, and will not be repeated here.

[0078] Six groups of colored inorganic artificial stone samples with corresponding pigment ratios were prepared and their performance was tested. All samples exhibited the following characteristics: smooth and bright surface, free of defects such as color patches and spots, and uniform color distribution; 60° gloss level not lower than 82 GU; compressive strength higher than 60 MPa; and color difference ΔE between samples was less than 1.0 after multiple repeated preparations with the same ratio, indicating that this method has excellent color reproducibility.

[0079] Example 3

[0080] By weight, the basic raw material composition is as follows: 8 parts of 5-mesh calcium sand, 2 parts of 20-mesh calcium sand, 5 parts of 40-mesh calcium sand, 15 parts of 60-mesh calcium sand, 20 parts of 80-mesh calcium sand, 13 parts of 100-mesh calcium sand, 3 parts of 325-mesh calcium powder, 1 part of HSP-V type polycarboxylate high-efficiency water-reducing agent, 1.2 parts of water, 23 parts of 525-mesh white cement, 3 parts of metakaolin, and 5 parts of styrene-butadiene emulsion.

[0081] To investigate the effect of pigment ratio on color, six groups of inorganic pigments with different mass ratios were set up, specifically:

[0082] Group 1: 0.10 parts titanium dioxide, 0.01 parts iron oxide red, and 0.03 parts iron oxide yellow;

[0083] Group 2: 0.10 parts titanium dioxide, 0.02 parts iron oxide red, and 0.06 parts iron oxide yellow;

[0084] Group 3: 0.10 parts titanium dioxide, 0.04 parts iron oxide red, and 0.12 parts iron oxide yellow;

[0085] Group 4: 0.10 parts titanium dioxide, 0.08 parts iron oxide red, and 0.24 parts iron oxide yellow;

[0086] Group 5: 0.10 parts titanium dioxide, 0.16 parts iron oxide red, and 0.48 parts iron oxide yellow;

[0087] Group 6: 0.10 parts titanium dioxide, 0.32 parts iron oxide red, and 0.96 parts iron oxide yellow.

[0088] The preparation method is the same as in the examples, and will not be repeated here.

[0089] Six groups of colored inorganic artificial stone samples with corresponding pigment ratios were prepared and their performance was tested. All samples exhibited the following characteristics: smooth and bright surface, free of defects such as color patches and spots, and uniform color distribution; 60° gloss level was not lower than 80 GU; compressive strength was higher than 60 MPa; and the color difference ΔE between samples was less than 1.0 after multiple repeated preparations with the same ratio, indicating that this method has excellent color reproducibility.

[0090] Example 4

[0091] By weight, the basic raw material composition is as follows: 8 parts of 5-mesh calcium sand, 2 parts of 20-mesh calcium sand, 5 parts of 40-mesh calcium sand, 15 parts of 60-mesh calcium sand, 20 parts of 80-mesh calcium sand, 13 parts of 100-mesh calcium sand, 3 parts of 325-mesh calcium powder, 1 part of HSP-V type polycarboxylate high-efficiency water-reducing agent, 1.2 parts of water, 23 parts of 525-mesh white cement, 3 parts of metakaolin, and 5 parts of styrene-butadiene emulsion.

[0092] To investigate the effect of pigment ratio on color, six groups of inorganic pigments with different mass ratios were set up, specifically:

[0093] Group 1: 0.10 parts iron oxide black, 0.01 parts iron oxide red, and 0.03 parts iron oxide yellow;

[0094] Group 2: 0.10 parts iron oxide black, 0.02 parts iron oxide red, and 0.06 parts iron oxide yellow;

[0095] Group 3: 0.10 parts iron oxide black, 0.04 parts iron oxide red, and 0.12 parts iron oxide yellow;

[0096] Group 4: 0.10 parts iron oxide black, 0.08 parts iron oxide red, and 0.24 parts iron oxide yellow;

[0097] Group 5: 0.10 parts iron oxide black, 0.16 parts iron oxide red, and 0.48 parts iron oxide yellow;

[0098] Group 6: 0.10 parts of iron oxide black, 0.32 parts of iron oxide red, and 0.96 parts of iron oxide yellow.

[0099] The preparation method is the same as in the examples, and will not be repeated here.

[0100] Six groups of colored inorganic artificial stone samples with corresponding pigment ratios were prepared and their performance was tested. All samples exhibited the following characteristics: smooth and bright surface, free of defects such as color patches and spots, and uniform color distribution; 60° gloss level not lower than 82 GU; compressive strength higher than 60 MPa; and color difference ΔE between samples was less than 1.0 after multiple repeated preparations with the same ratio, indicating that this method has excellent color reproducibility.

[0101] 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; and these 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 colored inorganic artificial stone, characterized in that, Includes the following steps: S1. Add graded aggregates and inorganic color powder to a mixer for dry mixing, then add water, water-reducing agent, white cement, metakaolin and emulsion to the mixer for mixing to obtain a mixture; Among them, the graded aggregates include 5 mesh calcium sand, 20 mesh calcium sand, 40 mesh calcium sand, 60 mesh calcium sand, 80 mesh calcium sand, 100 mesh calcium sand and 325 mesh calcium powder. S2. Place the mixture in a mold and press it to form a rough sheet; S3. The rough slabs are successively cured and polished to obtain colored inorganic artificial stone.

2. The method for preparing colored inorganic artificial stone according to claim 1, characterized in that, In S1, By weight, the aggregate consists of 0.1-0.5 parts inorganic color powder, 1-2 parts water, 1-2 parts water-reducing agent, 20-35 parts inorganic cementitious material, 0-10 parts emulsion, and graded aggregates including 5-10 parts 5-mesh calcium sand, 1-5 parts 20-mesh calcium sand, 1-10 parts 40-mesh calcium sand, 10-20 parts 60-mesh calcium sand, 20-25 parts 80-mesh calcium sand, 10-20 parts 100-mesh calcium sand, and 1-5 parts 325-mesh calcium powder.

3. The method for preparing colored inorganic artificial stone according to claim 2, characterized in that, The graded aggregate includes 7-10 parts of 5-mesh calcium sand, 1-3 parts of 20-mesh calcium sand, 4-7 parts of 40-mesh calcium sand, 13-20 parts of 60-mesh calcium sand, 20-25 parts of 80-mesh calcium sand, 10-15 parts of 100-mesh calcium sand, and 2-4 parts of 325-mesh calcium powder.

4. The method for preparing colored inorganic artificial stone according to claim 2, characterized in that, The inorganic cementitious material is a mixture of 525-mesh white cement and metakaolin, with 20-30 parts white cement and 0-5 parts metakaolin by weight.

5. The method for preparing colored inorganic artificial stone according to claim 1, characterized in that, In step S1, graded aggregates and inorganic color powder are added to a mixer and dry-mixed for 1-2 minutes. Then, water-reducing agent and water are added to the mixer and mixed for 2-3 minutes. Next, inorganic cementitious materials are added to the mixer and mixed for 3-5 minutes. Finally, emulsion is added to the mixer and mixed for 3-5 minutes.

6. The method for preparing colored inorganic artificial stone according to claim 1, characterized in that, The inorganic pigment is a compound of at least two of iron oxide red, iron oxide yellow, iron oxide black and titanium dioxide.

7. The method for preparing colored inorganic artificial stone according to claim 1, characterized in that, The water-reducing agent is HSP-V type polycarboxylate high-efficiency water-reducing agent with a solid content of 30% and a water reduction rate of 25%. The emulsion is styrene-butadiene emulsion.

8. The method for preparing colored inorganic artificial stone according to claim 1, characterized in that, In S2, the mixture is placed in a mold and vacuum-pressed, with a vacuum degree of 0.1 MPa, a press holding time of 120-180 s, and a press pressure of 40-45 MPa. In S3, the curing temperature is 20℃-40℃, the curing humidity is ≥95%, and the curing time is 6-8 days.

9. A colored inorganic artificial stone, characterized in that, It is prepared by the method for preparing colored inorganic artificial stone according to any one of claims 1-8.

10. A method for color matching in custom-colored inorganic artificial stone, characterized in that, Includes the following steps: A1. Based on the gradient of pigment ratios, the inorganic artificial stone under each pigment ratio gradient is prepared by the preparation method described in any one of claims 1-8, and the inorganic artificial stone under each pigment ratio gradient forms an inorganic artificial stone color gradation plate; the color gradation plate has multiple color block areas, and each color block area corresponds to a specific pigment ratio. A2. Based on the proportion of color powder corresponding to the target color block area selected by the user from the color scale, colored inorganic artificial stone is prepared by the preparation method described in any one of claims 1-8.

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