Environmentally friendly gypsum color powder and preparation method and application thereof

Abstract

The present invention relates to the technical field of building materials, and provides an environmentally friendly gypsum color powder, a preparation method thereof, and an application thereof. The raw materials of the environmentally friendly gypsum color powder include, by weight, 55-65 parts of gypsum powder and 35-45 parts of a dye mixture, wherein the components of the dye mixture include, by mass percentage, 55%-60% of water, 25-35% of a polymer dye, 8-12% of an aqueous emulsion, 0.5-2% of a dispersant, and 0.1-1% of a defoamer. The environmentally friendly gypsum color powder produced by the present invention is rich in color, uniform in color, and does not bleed. It does not contain heavy metals and other harmful substances, is green and environmentally friendly, and can be widely used in architectural decorative coatings, gypsum handicrafts, and the like.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to an environmentally friendly gypsum color powder and a preparation method and application thereof. Background Art

[0002] Traditional gypsum powder is mainly white. Although it has good plasticity and coagulation, it has certain limitations in terms of aesthetics and personalized needs. Therefore, developing a method for producing colored gypsum powder to meet decorative and personalized needs has important market value and application prospects.

[0003] There are two main technical paths for producing colored gypsum powder in the market: one is to use the colorful characteristics of chromium salts to transform them into colored gypsum of various colors. For example, in patent CN1508088A, this method must use gypsum powder containing chromium salts, which has production limitations. At the same time, chromium salts and their compounds are included in the list of Class 3 carcinogens, and the content must be strictly controlled otherwise it will not meet the national environmental protection requirements; the other is to directly blend pigment powder and gypsum powder to obtain colored gypsum powder; the color of the colored gypsum powder obtained by this blending is not easy to be uniform, and the color of the gypsum powder is easy to float, bloom, and migrate when it is used with water (it will fade when touched by hand after drying), so colored gypsum powder has not yet been mass-produced.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an environmentally friendly gypsum color powder and a preparation method and application thereof. The environmentally friendly gypsum color powder produced by the present invention has rich colors, uniform colors, resistance to color migration, no color bleeding, and does not contain heavy metals and other harmful substances. It is green and environmentally friendly and can be widely used in architectural decorative coatings or gypsum handicrafts.

[0006] The present invention is achieved in that:

[0007] In a first aspect, the present invention provides an environmentally friendly gypsum color powder, the raw materials of which include, by weight: 55-65 parts of gypsum powder and 35-45 parts of a dye mixture, wherein the components of the dye mixture include, by mass percentage, 55%-60% water, 25-35% polymer dye, 8-12% aqueous emulsion, 0.5-2% dispersant and 0.1-1% defoaming agent.

[0008] In an optional embodiment, the gypsum powder includes natural building gypsum powder or desulfurized building gypsum powder, and the average particle size of the gypsum powder is 100-300 meshes.

[0009] In an optional embodiment, the polymer dye includes TR-20164 bright red, TY-20272 goose yellow, and TB20255 brilliant blue.

[0010] In an optional embodiment, the aqueous emulsion comprises an aqueous polyurethane emulsion.

[0011] In a second aspect, the present invention provides a method for preparing an environmentally friendly gypsum color powder, which comprises uniformly mixing the raw materials in the environmentally friendly gypsum color powder as described in the aforementioned embodiment.

[0012] In an optional embodiment, the step of uniformly mixing the raw materials includes: first mixing the components of the dye mixture, then mixing the gypsum powder and the dye mixture, leaving them to an initial setting state at room temperature, then drying to obtain hydrate crystals, and crushing the hydrate crystals to obtain environmentally friendly gypsum color powder.

[0013] In an optional embodiment, the drying temperature is 70-90° C. for 5-12 hours.

[0014] In an optional embodiment, the crushed particle size is 200-400 mesh.

[0015] In a third aspect, the present invention provides the use of the environmentally friendly gypsum color powder as described in any of the aforementioned embodiments or the environmentally friendly gypsum color powder prepared by the preparation method of the environmentally friendly gypsum color powder as described in any of the aforementioned embodiments in the preparation of building materials or gypsum handicrafts.

[0016] In a fourth aspect, the present invention provides a colored building powder, comprising a building base powder and the environmentally friendly gypsum color powder as described in any one of the aforementioned embodiments or the environmentally friendly gypsum color powder prepared by the preparation method of the environmentally friendly gypsum color powder as described in any one of the aforementioned embodiments, the mass ratio of the building base powder to the environmentally friendly gypsum color powder is 90-99%:1-10%; the building base powder comprises at least one of gypsum powder and calcium carbonate powder.

[0017] The present invention has the following beneficial effects:

[0018] The environmentally friendly gypsum color powder provided by the present invention is introduced into a polymer dye and an aqueous emulsion during the process of mixing and wetting the gypsum powder with water. The polymer dye and the aqueous emulsion have excellent film-forming properties, and can dye the gypsum powder while coating the gypsum powder. During the hydration reaction of the gypsum powder and water, the colored gypsum powder is coated, and the colored gypsum powder is hydrated to form colored gypsum hydrate crystals. The colored gypsum hydrate crystals are crushed to obtain an environmentally friendly gypsum color powder with insoluble and infusible characteristics. The environmentally friendly gypsum color powder has rich colors, uniform colors, no color bleeding, and does not contain heavy metals and other harmful substances. It is green and environmentally friendly and can be widely used in architectural decorative coatings, gypsum crafts, etc. For example, when applied to architectural decorative coatings, the prepared environmentally friendly gypsum color powder can be uniformly mixed in proportion with a building base powder (such as gypsum powder) according to different color requirements to obtain a finished colored building powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the preparation process of the implementation case 1 and the comparative case 1 in the experimental example 1 of the present invention;

[0021] Figure 2 It is a schematic diagram of applying the coatings of Example 1 and Comparative Example 1 of Experimental Example 1 of the present invention on the wall after being evenly mixed and then wiping after drying;

[0022] Figure 3 It is a schematic diagram of the preparation process of the implementation case 2 and the comparative case 2 in the experimental example 1 of the present invention;

[0023] Figure 4 It is a schematic diagram of the crafts formed after being uniformly mixed in the implementation case 2 and the comparative case 2 in the experimental example 1 of the present invention, and wiping after drying;

[0024] Figure 5 It is a schematic diagram of the preparation process of the implementation case 3 and the comparative case 3 in the experimental example 1 of the present invention;

[0025] Figure 6 This is a schematic diagram of applying the implementation case 3 and the comparative case 1 in the experimental example 1 of the present invention on the wall after being evenly mixed and wiping after drying. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or 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 purchased commercially.

[0027] The invention provides an environmentally friendly gypsum color powder. The raw materials thereof include, by weight, 55-65 parts of gypsum powder and 35-45 parts of a dye mixture. The components of the dye mixture include, by weight, 55%-60% of water, 25-35% of a polymer dye, 8-12% of an aqueous emulsion, 0.5-2% of a dispersant and 0.1-1% of a defoamer.

[0028] In the present invention, the film-forming property of polymer dye and aqueous emulsion is used to coat the gypsum powder, and water can react with the gypsum powder to produce hardening and crystallization. Specifically, the gypsum powder absorbs water to form hydrate crystals when it meets water. The hydrate is called gypsum hydrate crystals. The gypsum hydrate crystals have higher density and strength. The polymer dye, aqueous emulsion and water are pre-mixed to form a dye mixture. When the dye mixture is mixed with the gypsum powder, the gypsum powder contacts the dye mixture. At this time, the aqueous solution mixed with the polymer dye and aqueous emulsion wets the gypsum powder, dyes and coats the gypsum powder. At the same time, the water in the dye mixture reacts with the gypsum powder to produce hydration, thereby changing the dyed and coated gypsum powder into colored gypsum hydrate crystals.

[0029] Among them, gypsum powder includes but is not limited to natural building gypsum powder, desulfurized building gypsum powder or high-purity gypsum powder, among which desulfurized building gypsum powder is the waste residue produced after flue gas desulfurization in power plants, which is calcined into semi-hydrated gypsum; high-purity gypsum powder is dihydrate gypsum, also called anhydrite powder. The average particle size of the gypsum powder is 100-300 mesh.

[0030] Polymer dyes include but are not limited to TR-20164 red, TY-20272 goose yellow, and TB20255 brilliant blue. The above-mentioned polymer dyes TR-20164 red, TY-20272 goose yellow, and TB20255 brilliant blue are all commercially available and purchased from Zhejiang Caihua Technology Co., Ltd. Among them, polymer dyes can be selected differently according to different color requirements. Polymer dyes refer to dyes with relatively large molecular weights. From a professional perspective, polymer dyes are colored dyes and colorless polymers that are combined by chemical bonds to form colored polymers. Compared with traditional small molecule dyes, polymer dyes have the advantages of strong stability, good color fastness, and environmental friendliness. At the same time, polymer dyes have good dyeing properties, bright colors, and rich colors. Polymer dyes not only have the strong absorption and colorfulness of organic dyes to light, but also have the properties of high strength, easy film formation, solvent resistance, migration resistance, heat resistance, etc. of polymer polymers. At the same time, the polymer dye in the present invention is used as the main dyeing component, which can not only dye the gypsum powder, but also play a certain coating effect on the gypsum powder. The principle of the coating effect is to use the film-forming property of the polymer dye to coat the dyed gypsum powder, because the polymer dye dyeing group is integrated with the polymer through a chemical bond, so the problem of color migration of traditional water-based small molecule dyes can be avoided. The water-based emulsion includes a water-based polyurethane emulsion. The water-based emulsion in the present invention has a certain film-forming property, which is conducive to improving the coating performance of the polymer dye and making the color of the gypsum powder more solid.

[0031] It should be noted that in the present invention, the mass ratio of gypsum powder and dye mixture is determined based on the amount of water in the gypsum powder and dye mixture and the required color depth. First, the amount of dye added to the mixture is determined according to the required color depth, and secondly, the amount of dye mixture added needs to ensure that the gypsum powder can be completely hydrated into crystals, that is, the added dye mixture contains enough water required for the gypsum powder to be completely hydrated. When the amount of dye mixture is too much or too little, it is not conducive to the hydration of gypsum powder.

[0032] Furthermore, the present invention also provides a method for preparing the above-mentioned environmentally friendly gypsum color powder, which comprises uniformly mixing the raw materials in the above-mentioned environmentally friendly gypsum color powder.

[0033] Specifically, the step of uniformly mixing the raw materials includes: first mixing the components of the dye mixture, then mixing the gypsum powder and the dye mixture, leaving them to an initial setting state at room temperature, then drying to obtain hydrate crystals, and crushing the hydrate crystals to obtain environmentally friendly gypsum color powder.

[0034] The gypsum powder and dye mixture are stirred at 400-600 rpm for 3-5 minutes, and placed at room temperature for 10-20 minutes. During this process, the gypsum powder undergoes a sufficient hydration reaction, and then the drying temperature is 70-90° C. for 5-12 hours. Excess water can be removed by drying to obtain hydrate crystals, and the crushed particle size is 200-400 mesh. The hydrate crystals can be turned into powder by crushing, which is easier to store, transport and mix in the subsequent process.

[0035] Furthermore, in the present invention, by premixing the components of the dye mixture, it can be ensured that when the gypsum powder is mixed with the dye mixture, it has sufficient internal moisture, moderate mixing viscosity, and is easy to mix. In the present invention, by providing an environmentally friendly gypsum color powder, it is in powder form, the main component of which is gypsum crystals, and has the characteristics of being insoluble and infusible, wherein "insoluble" means that it is insoluble in water at room temperature, and when applied to an aqueous system, it is not easy to float color and color migration. "Infusible" means that it will not melt at a certain temperature (for example, 20-100°C), and it can be widely used in the preparation of building materials and gypsum handicrafts.

[0036] In addition, the present invention provides a colored building powder, which includes a building base powder and the above-mentioned environmentally friendly gypsum color powder, the mass ratio of gypsum powder to the environmentally friendly gypsum color powder is 90-99%:1-10%; the building base powder includes at least one of gypsum powder and calcium carbonate powder.

[0037] In the present invention, by mixing environmentally friendly gypsum color powder with building base powder, it can be prepared to obtain colored building powder, and the amount of environmentally friendly gypsum color powder added is added according to the desired color degree, for example, the amount can be any one of 1%, 2%, 3%, 5%, 8%, 10% or any two range values. At the same time, since the amount of environmentally friendly gypsum color powder added is only 1-10%, it has little effect on the properties of the building base powder itself. In addition, the present invention uses a polymer dye to dye and coat the gypsum powder, and the crystals formed after the hydration of the gypsum powder become colored gypsum hydrate crystals. The environmentally friendly gypsum color powder prepared by the above process is mainly used in water-based systems, but because it is a crystal structure, it will not be water-soluble under normal temperature conditions, and it will not melt at the same time, so its properties are stable. In the present invention, the environmentally friendly gypsum color powder is prepared in advance, and the environmentally friendly gypsum color powder provided by the present invention is powdery, and it can be mixed with building gypsum powder to obtain a colored building powder. This colored building powder can be directly added with water and stirred at the construction site for construction, which is simple to operate and easy to implement. Compared with dyeing gypsum powder by mixing polymer dyes and water directly on the construction site, on-site operation is more difficult. Polymer dyes are liquids, and the difficulty of mixing them on site is more complicated than the colored building powder produced by environmentally friendly gypsum color powder, which can be directly mixed with water and used.

[0038] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0039] Example 1

[0040] This embodiment provides a colored building powder (light pink), which includes the following steps:

[0041] (1) Turn the mixer to 200 rpm, add 58.5 parts of water, 30 parts of TR-20164 bright red polymer dye, 10 parts of water-based polyurethane (300A), 1 part of dispersant (Tiger 680 dispersant) and 0.5 parts of defoamer (Shenzhu Chemical SN6725) in sequence, mix and stir for 10-15 minutes to make a dye mixture;

[0042] (2) adding 60 parts of desulfurized building gypsum powder to 40 parts of the dye mixture and stirring at 500 rpm for 3-5 minutes to prepare red gypsum slurry;

[0043] (3) Pour the red gypsum slurry into a stainless steel tray and place it at room temperature for about 15 minutes until it is in an initial setting state. Place the red slurry in an oven at 80° C. for 5-12 hours until it is completely dry to obtain red gypsum hydrate crystals;

[0044] (4) crushing the red gypsum hydrate crystals into 300 meshes using a pulverizer to obtain red gypsum hydrate crystal powder as an environmentally friendly gypsum color powder;

[0045] (5) Mix 98 parts of desulfurized gypsum powder and 2 parts of the above-mentioned red environmentally friendly gypsum color powder and stir evenly to obtain light pink gypsum powder.

[0046] Example 2

[0047] This embodiment provides a colored building powder (light blue), which includes the following steps:

[0048] (1) Turn the mixer to 200 rpm, add 58.5 parts of water, 30 parts of TB20255 brilliant blue polymer dye, 10 parts of waterborne polyurethane (300A), 1 part of dispersant and 0.5 parts of defoamer in sequence, mix and stir for 10-15 minutes to prepare a dye mixture;

[0049] (2) adding 60 parts of natural gypsum powder to 40 parts of the dye mixture and stirring at 500 rpm for 3-5 minutes to prepare a bright blue gypsum slurry;

[0050] (3) pouring the bright blue gypsum slurry into a stainless steel tray and placing it at room temperature for about 15 minutes until it is in an initial setting state, and placing the bright blue gypsum slurry in an oven at 80° C. for 5-12 hours until it is completely dry to obtain bright blue gypsum hydrate crystals;

[0051] (4) crushing the bright blue gypsum hydrate crystals into 300 meshes using a pulverizer to obtain bright blue gypsum hydrate crystal powder as an environmentally friendly gypsum color powder;

[0052] (5) 98 parts of desulfurized gypsum powder and 2 parts of the above-mentioned bright blue environmentally friendly gypsum color powder are mixed and stirred evenly to obtain light blue natural gypsum powder.

[0053] Example 3

[0054] This embodiment provides a colored building powder (light green), which includes the following steps:

[0055] (1) Turn the mixer to 200 rpm, add 58.5 parts of water, 20 parts of TB20255 brilliant blue polymer dye, 10 parts of TY-20272 goose yellow polymer dye, 10 parts of waterborne polyurethane (300A), 1 part of dispersant and 0.5 parts of defoamer in sequence, mix and stir for 10-15 minutes to prepare a dye mixture;

[0056] (2) Add 60 parts of desulfurized gypsum powder to 40 parts of the dye mixture and stir at 500 rpm for 3-5 minutes to prepare green gypsum slurry;

[0057] (3) Pour the green gypsum slurry into a stainless steel tray and place it at room temperature for about 15 minutes until it is in an initial setting state. Place the green gypsum slurry in an oven at 80° C. for 5-12 hours until it is completely dry to obtain green gypsum hydrate crystals;

[0058] (4) crushing the green gypsum hydrate crystals into 300 meshes using a pulverizer to obtain green gypsum hydrate crystal powder as an environmentally friendly gypsum color powder;

[0059] (5) 98 parts of desulfurized gypsum powder and 2 parts of the above green environmentally friendly gypsum color powder are mixed and stirred evenly to obtain light green natural gypsum powder.

[0060] Example 4

[0061] This embodiment provides a colored building powder (light pink), which includes the following steps:

[0062] (1) Turn the mixer to 200 rpm, add 60 parts of water, 28 parts of TR-20164 bright red polymer dye, 9 parts of waterborne polyurethane (300A), 2 parts of dispersant and 1 part of defoamer in sequence, mix and stir for 10-15 minutes to prepare a dye mixture;

[0063] (2) adding 65 parts of desulfurized building gypsum powder to 35 parts of the dye mixture and stirring at 500 rpm for 3-5 minutes to prepare red gypsum slurry;

[0064] (3) Pour the red gypsum slurry into a stainless steel tray and place it at room temperature for about 15 minutes until it is in an initial setting state. Place the red slurry in an oven at 70° C. for 5-12 hours until it is completely dry to obtain red gypsum hydrate crystals;

[0065] (4) crushing the red gypsum hydrate crystals into 200 meshes using a pulverizer to obtain red gypsum hydrate crystal powder as an environmentally friendly gypsum color powder;

[0066] (5) Mix 95 parts of desulfurized gypsum powder and 5 parts of the above-mentioned red environmentally friendly gypsum color powder and stir evenly to obtain light pink gypsum powder.

[0067] Example 5

[0068] This embodiment provides a colored building powder (light pink), which includes the following steps:

[0069] (1) Turn the mixer to 200 rpm, add 55 parts of water, 35 parts of TR-20164 bright red polymer dye, 8 parts of waterborne polyurethane (300A), 1.5 parts of dispersant and 0.5 parts of defoamer in sequence, mix and stir for 10-15 minutes to prepare a dye mixture;

[0070] (2) adding 55 parts of desulfurized building gypsum powder to 45 parts of the dye mixture and stirring at 500 rpm for 3-5 minutes to prepare red gypsum slurry;

[0071] (3) Pour the red gypsum slurry into a stainless steel tray and place it at room temperature for about 15 minutes until it is in an initial setting state. Place the red slurry in an oven at 90° C. for 5-12 hours until it is completely dry to obtain red gypsum hydrate crystals;

[0072] (4) crushing the red gypsum hydrate crystals into 400 meshes using a pulverizer to obtain red gypsum hydrate crystal powder as an environmentally friendly gypsum color powder;

[0073] (5) Mix 90 parts of desulfurized gypsum powder and 10 parts of the above-mentioned red environmentally friendly gypsum color powder and stir them evenly to obtain light pink gypsum powder.

[0074] Experimental Example 1: Color Test

[0075] In this experimental example, the light pink gypsum powder provided in Example 1 is used in combination with auxiliary materials to prepare the pink wall gypsum powder of Example 1, and a corresponding comparative case 1 is provided. In the comparative case 1, desulfurized gypsum powder and red pigment powder (commercially purchased from Jiangsu Liwang 3117 light-fast red) are mixed to prepare light pink gypsum powder, and the pink wall gypsum powder of the comparative case 1 is prepared in combination with the same auxiliary materials.

[0076] In this experimental example, the light blue gypsum powder provided in Example 2 is used in combination with auxiliary materials to prepare the blue handicraft gypsum powder of Example 2, and a corresponding comparative case 2 is provided. In comparative case 2, desulfurized gypsum powder and blue pigment powder (commercially purchased from Jiangsu Liwang PB15 phthalocyanine blue) are mixed to prepare light blue gypsum powder, and the same auxiliary materials are used to prepare the blue handicraft gypsum powder of comparative case 2.

[0077] In this experimental example, the light green gypsum powder provided in Example 3 is used in combination with auxiliary materials to prepare the pink wall gypsum powder of Implementation Case 3, and a corresponding comparative case 3 is provided. In Comparative Case 3, desulfurized gypsum powder and green pigment powder (commercially available from Colorful Pigments 9703 Phthalocyanine Green) are mixed to prepare light green gypsum powder, and the same auxiliary materials are used to prepare the pink wall gypsum powder of Comparative Case 3.

[0078] The composition of the wall gypsum powder or handicraft gypsum powder of implementation cases 1 to 3 and comparison cases 1 to 3 can be found in Table 1.

[0079] Table 1. Ingredients of wall gypsum powder and handicraft gypsum powder

[0080]

[0081] See also Figure 1 and Figure 2The wall gypsum powder was mixed according to the ratio of gypsum powder: water = 100: 65-70. During the mixing process, it can be seen that the slurry prepared in Implementation Case 1 has uniform color, while the slurry in Comparative Case 1 has obvious floating color. After uniform mixing, it was applied to the wall. After it dried, the wall was wiped with a wet tissue. It was found that the wall gypsum powder in Implementation Case 1 did not have the problem of color bleeding and color migration, while the wall gypsum powder in Comparative Case 1 obviously had color bleeding and color migration.

[0082] See also Figure 3 and Figure 4 The handicraft gypsum powder is prepared according to the ratio of gypsum powder: water = 100:35-40. During the preparation process, it can be seen that the slurry prepared in Implementation Case 2 has uniform color, while the slurry in Comparative Case 2 has obvious floating color. After uniform preparation, it is placed in the mold for molding. After it is dried, the handicraft is wiped with a wet tissue. It is found that the gypsum powder of the handicraft in Implementation Case 2 does not have the problem of color bleeding and color migration, while the gypsum powder of the handicraft in Comparative Case 2 obviously has the problem of color bleeding and color migration.

[0083] See also Figure 5 and Figure 6 , the wall gypsum powder was prepared according to the ratio of gypsum powder: water = 100: 65-70. During the preparation process, it can be seen that the slurry prepared in Implementation Case 3 has uniform color, while the slurry in Comparative Case 2 has obvious floating color. After uniform mixing, it was applied to the wall. After it dried, the wall was wiped with a wet tissue. It was found that the wall gypsum powder in Implementation Case 2 did not have the problem of color bleeding and color migration, while the wall gypsum powder in Comparative Case 2 obviously had color bleeding and color migration.

[0084] Experimental Example 2

[0085] The colored building powders of Examples 1-5 were tested according to GB / T 9776-2022. Please refer to Tables 2 and 3 for the test results.

[0086] Table 2. Statistics of detection results for different examples

[0087]

[0088] Table 3. Statistics of detection results of different examples

[0089]

[0090] It can be seen from the above table that the performance and harmful substance content of the formula provided in the embodiment of the present invention within the range of the addition amount of each raw material meet the requirements.

[0091] In Example 1, the gypsum powder adopts desulfurized building gypsum powder, and the prepared colored gypsum powder is low-cost, environmentally friendly and practical, and can be used for building decoration materials, such as colored putty, colored gypsum board, etc.; in Example 2, natural industrial gypsum powder is adopted, and the prepared colored gypsum powder can be used to make colored ceramics and colored gypsum crafts, etc.; in Example 3, different color dyes are selected to compound to obtain colored gypsum powder with different monochrome dyes. In Examples 4 and 5, the parameters in the preparation process are adjusted within the scope of the present invention, and environmentally friendly gypsum color powder that meets the requirements can still be obtained.

[0092] In summary, the environmentally friendly gypsum color powder provided by the present invention is introduced into the polymer dye and the aqueous emulsion during the process of mixing and wetting the gypsum powder with water. The polymer dye and the aqueous emulsion have excellent film-forming properties, and can dye the gypsum powder while coating the gypsum powder. In the process of hydration reaction between the gypsum powder and water, the colored gypsum powder is coated, so that the gypsum hydrate crystals formed after hydration are crushed to obtain the environmentally friendly gypsum color powder with insoluble and infusible characteristics. The environmentally friendly gypsum color powder is rich in color, uniform in color, and does not bleed. At the same time, it does not contain heavy metals and other harmful substances, is green and environmentally friendly, and can be widely used in architectural decorative coatings, gypsum crafts, etc. For example, when applied to architectural decorative coatings, the prepared environmentally friendly gypsum color powder can be uniformly mixed in proportion with the building base powder (such as gypsum powder) according to different color requirements to obtain a finished colored building powder.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention, such as replacing gypsum powder with other powders that also have a hydration coating effect, shall be included in the protection scope of the present invention.

Claims

1. An environmentally friendly gypsum toner, characterized in that: The raw materials include, by weight: 55-65 parts of gypsum powder and 35-45 parts of dye mixture, wherein the components of the dye mixture include, by weight percentage, 55%-60% of water, 25-35% of polymer dye, 8-12% of water-based emulsion, 0.5-2% of dispersant and 0.1-1% of defoamer; the particle size of the environmentally friendly gypsum color powder is 200-400 meshes; the water-based emulsion includes water-based polyurethane emulsion; The preparation method of the environmentally friendly gypsum color powder comprises: firstly mixing the components of the dye mixture, then mixing the gypsum powder and the dye mixture, placing them at room temperature to an initial setting state, then drying to obtain hydrate crystals, and crushing the hydrate crystals to obtain the environmentally friendly gypsum color powder.

2. The environmentally friendly gypsum toner according to claim 1, characterized in that: The gypsum powder includes natural building gypsum powder or desulfurized building gypsum powder, and the average particle size of the gypsum powder is 100-300 meshes.

3. A method for preparing an environmentally friendly gypsum color powder, characterized in that: The method comprises uniformly mixing the raw materials in the environmentally friendly gypsum toner according to any one of claims 1 to 2; The step of uniformly mixing the raw materials includes: firstly mixing the components of the dye mixture, then mixing the gypsum powder and the dye mixture, placing them at room temperature until they are in an initial setting state, then drying to obtain hydrate crystals, and crushing the hydrate crystals to obtain environmentally friendly gypsum color powder.

4. The method for preparing the environmentally friendly gypsum toner according to claim 3, characterized in that: The drying temperature is 70-90° C. and the drying time is 5-12 hours.

5. The method for preparing the environmentally friendly gypsum toner according to claim 3, characterized in that: The particle size of the crushed particles is 200-400 meshes.

6. Use of the environmentally friendly gypsum color powder as claimed in any one of claims 1 to 2 or the environmentally friendly gypsum color powder prepared by the preparation method of the environmentally friendly gypsum color powder as claimed in any one of claims 3 to 5 in the preparation of building materials or gypsum handicrafts.

7. A colored building powder, characterized in that: It comprises a building base powder and an environmentally friendly gypsum color powder as described in any one of claims 1 to 2 or an environmentally friendly gypsum color powder prepared by the preparation method of the environmentally friendly gypsum color powder as described in any one of claims 3 to 5, wherein the mass ratio of the building base powder to the environmentally friendly gypsum color powder is 90-99%:1-10%; the building base powder comprises at least one of gypsum powder and calcium carbonate powder.

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