Pigment preparation method and pigment

Abstract

The invention provides a pigment preparation method and a pigment, and relates to the technical field of pigment processing.The method comprises the steps that a pasty adhesive is prepared based on mixing of edible peach gum and edible starch; plants are subjected to freeze-drying treatment, the plants subjected to freeze-drying treatment are smashed, plant powder is obtained, the plants are plants containing pigments, and the plant powder contains the pigments; mixing the paste adhesive with the plant powder to obtain a mixed paste; the mixed paste is subjected to air drying treatment, the air-dried mixed paste is smashed, and pigment powder is obtained; and tabletting and molding the pigment powder to obtain the pigment. The use flexibility of the pigment can be improved.

Description

Technical Field

[0001] This invention relates to the field of pigment processing technology, specifically to a pigment preparation method and a pigment. Background Technology

[0002] To achieve a wider range of colors, painting pigments are typically made from chemical raw materials. During use, artists often come into direct skin contact with the pigments, or there is a risk of accidental ingestion. Since these pigments are made from chemical raw materials, direct skin contact or ingestion can harm the health of children, limiting the number of people who can use them and restricting their flexibility in application.

[0003] It is evident that the relevant technologies suffer from a lack of flexibility in the use of pigments. Summary of the Invention

[0004] This invention provides a pigment preparation method and a pigment to solve the problem of poor flexibility in the use of pigments in related technologies.

[0005] To address the above problems, embodiments of the present invention provide a pigment preparation method, comprising:

[0006] A paste adhesive was prepared by mixing edible peach gum and edible starch;

[0007] The plant is freeze-dried and then pulverized to obtain plant powder. The plant is a plant containing pigments, and the plant powder contains pigments.

[0008] The paste binder is mixed with the plant powder to obtain a mixed paste;

[0009] The mixed paste is air-dried, and the air-dried mixed paste is then pulverized to obtain pigment powder;

[0010] The pigment powder is pressed into tablets to obtain the pigment.

[0011] In one embodiment, the preparation of the paste adhesive based on a mixture of edible peach gum and edible starch includes:

[0012] The edible peach gum is dissolved in ultrapure water within a set temperature range to obtain a peach gum solution;

[0013] The gum solution is cooled, and edible starch is added to the cooled gum solution to obtain the paste adhesive.

[0014] In one embodiment, after cooling the gum solution and adding edible starch to the cooled gum solution to obtain the paste adhesive, the method further includes:

[0015] Edible glycerin and a chelating agent are added to the paste binder;

[0016] The step of mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0017] The paste binder with added edible glycerin and chelating agent is mixed with the plant powder to obtain the mixed paste;

[0018] The chelating agent is used to bind with metal ions in the paste adhesive to reduce the concentration of metal ions.

[0019] In one embodiment, after cooling the gum solution and adding edible starch to the cooled gum solution to obtain the paste adhesive, the method further includes:

[0020] Citric acid and potassium sorbate are added to the paste binder;

[0021] The step of mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0022] The paste binder containing citric acid and potassium sorbate is mixed with the plant powder to obtain the mixed paste;

[0023] The citric acid and potassium sorbate are used to extend the service life of the pigment.

[0024] In one embodiment, after cooling the gum solution and adding edible starch to the cooled gum solution to obtain the paste adhesive, the method further includes:

[0025] Edible glycerin, chelating agents, citric acid, and potassium sorbate are added to the paste binder;

[0026] The step of mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0027] The paste binder containing edible glycerin, chelating agent, citric acid and potassium sorbate is mixed with the plant powder to obtain the mixed paste.

[0028] In one embodiment, the process of freeze-drying the plant and then pulverizing the freeze-dried plant to obtain plant powder includes:

[0029] Cut the plant into pieces;

[0030] The cut plant was freeze-dried in a temperature range of -40°C to 10°C.

[0031] The freeze-dried plant was pulverized to obtain the plant powder.

[0032] In one embodiment, the plant powder has a fineness greater than 800 mesh, and / or the pigment powder has a particle size less than 35 micrometers.

[0033] In one embodiment, mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0034] The paste binder and the plant powder are mixed under preset conditions to obtain the mixed paste;

[0035] The preset conditions include at least one of the following:

[0036] The mixing temperature is below 20℃, the pH value is between 6 and 7.5, and the pressure is -0.9Pa.

[0037] In one embodiment, the preparation of the paste adhesive based on a mixture of edible peach gum and edible starch includes:

[0038] A paste adhesive is prepared in enamel or ceramic equipment based on a mixture of edible gum and edible starch.

[0039] The process of freeze-drying the plant and then pulverizing the freeze-dried plant to obtain plant powder includes:

[0040] The plant is freeze-dried in an enamel or ceramic apparatus, and the freeze-dried plant is then pulverized to obtain the plant powder.

[0041] The step of mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0042] The paste binder is mixed with the plant powder in an enamel or ceramic apparatus to obtain the mixed paste.

[0043] The present invention also provides a pigment, which is prepared by any of the pigment preparation methods described above.

[0044] One of the above technical solutions has the following advantages or beneficial effects:

[0045] In this embodiment of the invention, a paste binder is prepared based on a mixture of edible gum and edible starch; plants are freeze-dried and then pulverized to obtain plant powder, wherein the plants are pigment-containing plants and the plant powder contains pigments; the paste binder is mixed with the plant powder to obtain a mixed paste; the mixed paste is air-dried and then pulverized to obtain pigment powder; the pigment powder is pressed into tablets to obtain pigment. Thus, pigments are prepared using edible gum, edible starch, and plants, eliminating the use of chemical raw materials. This ensures that the prepared pigments will not harm the health of children who paint, even if they come into direct contact with skin or are accidentally ingested, and children can also use the pigments, thereby improving the flexibility of pigment use. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a flowchart of a pigment preparation method provided in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the pigment preparation process provided in an embodiment of the present invention. Detailed Implementation

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] Please see Figure 1 , Figure 1 This is a flowchart of a pigment preparation method provided in an embodiment of the present invention, such as... Figure 1 As shown, it includes the following steps:

[0051] Step 101: Prepare a paste adhesive based on the mixture of edible peach gum and edible starch.

[0052] The aforementioned edible peach gum is used as a binder to evenly mix and fix pigments and edible starch, preventing problems such as pigment fading caused by the separation of pigments and starch. Furthermore, as an edible material, edible peach gum is safer than chemical raw materials and will not cause harm to health in the event of accidental skin contact or ingestion.

[0053] The aforementioned edible starch is used to increase the fixing components of pigments, and can be mixed with different pigments to create pigments of different colors. As an edible material, edible starch is safer than chemical raw materials and will not cause harm to health in the event of accidental skin contact or ingestion.

[0054] In some embodiments, the paste adhesive is prepared by mixing edible peach gum and edible starch. This can be done by mixing edible peach gum and edible starch and then adding a solvent to prepare the paste adhesive, or by dissolving edible peach gum in a solvent and then mixing it with edible starch to prepare the paste adhesive, or by dissolving edible starch in a solvent and then mixing it with edible peach gum to prepare the adhesive.

[0055] Step 102: Freeze-dry the plant and then pulverize the freeze-dried plant to obtain plant powder. The plant is a plant containing pigments, and the plant powder contains pigments.

[0056] The aforementioned plants contain pigments, such as gardenia fruit, turmeric rhizome, or sophora japonica buds. Different colors of pigments can be prepared by mixing the pigments from different plants with a paste binder. These plants are edible and will not cause harm to health if accidentally touched or ingested.

[0057] The freeze-drying process described above can retain the pigments in plants while reducing the moisture content of the plants, and at the same time avoid the destruction of the pigments by the original active substances of the plants during the subsequent pulverization process, thus achieving the goal of preserving the pigments in the plants.

[0058] It should be noted that pigments exist in plants in the form of particles. The freeze-dried plants are crushed to obtain plant powder, which contains pigments, so that they can be mixed with paste binders to prepare pigments.

[0059] The order in which step 101, preparing the paste adhesive, and step 102, obtaining the plant powder are performed is not important. That is, step 101 can be performed first and then step 102, or step 102 can be performed first and then step 101, or both steps 101 and 102 can be performed simultaneously. Step 103 is performed only after both steps 101 and 102 have been completed.

[0060] Step 103: Mix the paste adhesive with the plant powder to obtain a mixed paste.

[0061] The above-mentioned paste binder includes edible peach gum and edible starch, and the above-mentioned plant powder includes pigment. The paste binder and plant powder are mixed to achieve uniform mixing of pigment and edible starch.

[0062] Step 104: Air-dry the mixed paste and then pulverize the air-dried mixed paste to obtain pigment powder.

[0063] It should be noted that the paste binder contains a significant amount of moisture, and the mixed paste obtained after mixing the paste binder and plant powder also retains a considerable amount of moisture, making it prone to mold growth and hindering preservation. By air-drying the mixed paste to remove moisture and retain only the solid components (i.e., pigment powder), the shelf life of the pigment can be effectively extended.

[0064] Furthermore, after the mixed paste is air-dried, it is pulverized to obtain pigment powder, which can then be pressed into tablets to obtain pigments of different specifications.

[0065] The process involves air-drying the mixed paste to remove more than 95% of the moisture, thereby extending the lifespan of the pigments.

[0066] Step 105: Press the pigment powder into tablets to obtain the pigment.

[0067] In this embodiment of the invention, a paste binder is prepared based on a mixture of edible gum and edible starch; plants are freeze-dried and then pulverized to obtain plant powder, wherein the plants are pigment-containing plants and the plant powder contains pigments; the paste binder is mixed with the plant powder to obtain a mixed paste; the mixed paste is air-dried and then pulverized to obtain pigment powder; the pigment powder is pressed into tablets to obtain pigment. Thus, pigments are prepared using edible gum, edible starch, and plants, eliminating the use of chemical raw materials. This ensures that the prepared pigments will not harm the health of children who paint, even if they come into direct contact with skin or are accidentally ingested, and children can also use the pigments, thereby improving the flexibility of pigment use.

[0068] In one embodiment, the preparation of the paste adhesive based on a mixture of edible peach gum and edible starch includes:

[0069] The edible peach gum is dissolved in ultrapure water within a set temperature range to obtain a peach gum solution;

[0070] The gum solution is cooled, and edible starch is added to the cooled gum solution to obtain the paste adhesive.

[0071] The ultrapure water mentioned above contains far fewer metal ions than tap water or industrial water, thus avoiding pigment damage caused by metal ions. It should be noted that plant pigments typically contain functional groups (such as hydroxyl, carboxyl, or phenolic groups), which readily coordinate with metal ions, causing changes in the molecular structure and electronic state of the pigment, thus disrupting its original structure and resulting in fading or discoloration. Therefore, in this embodiment of the invention, ultrapure water is used as a solvent to dissolve edible peach gum, reducing the amount of metal ions that may be introduced, thereby minimizing pigment damage and improving the color rendering effect of the pigment.

[0072] Among them, the ultrapure water can be Class I ultrapure water, and the resistivity of Class I ultrapure water is ≥18MΩ*cm.

[0073] In some embodiments, to improve dissolution efficiency, the set temperature range is set to 110°C to 115°C. Edible peach gum is dissolved in ultrapure water within this range until the peach gum particles are completely dissolved in the ultrapure water to obtain a peach gum solution. However, at temperatures below 110°C, the dissolution efficiency of edible peach gum is low, and incomplete dissolution may occur. At temperatures above 115°C, the molecular structure of the edible peach gum is damaged, resulting in a less than satisfactory adhesive effect.

[0074] Furthermore, while the temperature of the aforementioned gum solution is within the set temperature range (110℃ to 115℃), this temperature is still too high for edible starch and would damage its molecular structure. Therefore, the gum solution needs to be cooled before mixing with edible starch. Specifically, the gum solution can be cooled to below 75℃, and then edible starch can be added within a certain temperature range (e.g., between 65℃ and 75℃) to thicken it.

[0075] In some implementations, a thickening time can be preset, for example, to 20 minutes. Within the temperature range and the set thickening time, the edible starch and gum solution are fully mixed to achieve the best thickening effect, that is, the edible starch does not form aggregates, so as to ensure the fineness of the paste binder, and thus ensure the fineness of the final pigment.

[0076] In this embodiment of the invention, edible peach gum is dissolved in ultrapure water within a set temperature range to obtain a peach gum solution; the peach gum solution is cooled, and edible starch is added to the cooled peach gum solution to obtain a paste binder, thereby reducing the number of metal ions that may be introduced, so as to reduce the damage to the pigment and improve the color rendering effect of the pigment.

[0077] In one embodiment, after cooling the gum solution and adding edible starch to the cooled gum solution to obtain the paste adhesive, the method further includes:

[0078] Edible glycerin and a chelating agent are added to the paste binder;

[0079] The step of mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0080] The paste binder with added edible glycerin and chelating agent is mixed with the plant powder to obtain the mixed paste;

[0081] The chelating agent is used to bind with metal ions in the paste adhesive to reduce the concentration of metal ions.

[0082] The aforementioned chelating agents are used to react with metal ions to further reduce the amount of metal ions in the paste binder and improve the pigment's appearance. It should be noted that a chelating agent is a substance that can form stable, colorless complexes with metal ions and prevent the metal ions from reacting with other substances. By adding chelating agents, pigments can be protected from the influence of metal ions, thereby improving the pigment's stability and color.

[0083] The aforementioned edible glycerin is used to slow down the drying speed of pigments during subsequent use, thereby extending the retention time of pigment colors.

[0084] In this process, edible glycerin and a chelating agent are added to the paste binder. This can be done by adding edible glycerin first and then the chelating agent, or by adding the chelating agent first and then the edible glycerin, or by adding edible glycerin and the chelating agent simultaneously.

[0085] In this embodiment of the invention, by adding edible glycerin and a chelating agent to the paste binder, and mixing the paste binder with plant powder to obtain a mixed paste, the metal ions in the mixed paste are reduced, thereby improving the rendering effect of the pigment. At the same time, edible glycerin can slow down the drying speed of the pigment in subsequent use, thereby prolonging the color retention time of the pigment.

[0086] In one embodiment, after cooling the gum solution and adding edible starch to the cooled gum solution to obtain the paste adhesive, the method further includes:

[0087] Citric acid and potassium sorbate are added to the paste binder;

[0088] The step of mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0089] The paste binder containing citric acid and potassium sorbate is mixed with the plant powder to obtain the mixed paste;

[0090] The citric acid and potassium sorbate are used to extend the service life of the pigment.

[0091] It should be noted that edible gum, edible starch, and plant powder are all edible raw materials with nutritional properties. They are prone to mold and not easy to preserve for a long time. Pigments made from edible gum, edible starch, and plant powder are also prone to mold and require the addition of preservatives to extend their lifespan.

[0092] Citric acid and potassium sorbate are food additives that can effectively play a role in preservation and protection. Adding citric acid and potassium sorbate to the paste binder ensures that the final pigment contains citric acid and potassium sorbate, thereby extending the pigment's service life.

[0093] Since citric acid and potassium sorbate are food additives, they will not cause harm to health if accidentally touched or ingested.

[0094] In this process, citric acid and potassium sorbate are added to the paste adhesive. Citric acid can be added first and then potassium sorbate, or potassium sorbate can be added first and then citric acid, or both citric acid and potassium sorbate can be added simultaneously.

[0095] In this embodiment of the invention, citric acid and potassium sorbate are added to the paste binder; the paste binder with added citric acid and potassium sorbate is mixed with plant powder to obtain a mixed paste, so that the final pigment contains citric acid and potassium sorbate, thereby extending the service life of the pigment.

[0096] In one embodiment, after cooling the gum solution and adding edible starch to the cooled gum solution to obtain the paste adhesive, the method further includes:

[0097] Edible glycerin, chelating agents, citric acid, and potassium sorbate are added to the paste binder;

[0098] The step of mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0099] The paste binder containing edible glycerin, chelating agent, citric acid and potassium sorbate is mixed with the plant powder to obtain the mixed paste.

[0100] In this embodiment of the invention, edible glycerin, chelating agents, citric acid, and potassium sorbate are added to the paste binder; the paste binder containing edible glycerin, chelating agents, citric acid, and potassium sorbate is mixed with plant powder to obtain a mixed paste. This reduces the metal ions in the mixed paste, improves the pigment's appearance, and the edible glycerin can slow down the drying speed of the pigment during subsequent use, thereby extending the pigment's color retention time and lifespan.

[0101] Specifically, since the temperature at which edible glycerin and chelating agents are added to the paste binder is relatively high, they can be added before the paste binder cools down. However, the temperature at which citric acid and potassium sorbate are added to the paste binder is relatively low, requiring the paste binder to cool down before they are added. The cooling temperature is below 30°C, meaning that citric acid and potassium sorbate are added after the paste has been cooled to below 30°C.

[0102] In one embodiment, the process of freeze-drying the plant and then pulverizing the freeze-dried plant to obtain plant powder includes:

[0103] Cut the plant into pieces;

[0104] The cut plant was freeze-dried in a temperature range of -40°C to 10°C.

[0105] The freeze-dried plant was pulverized to obtain the plant powder.

[0106] It should be noted that different plants vary in size. To improve the efficiency of freeze-drying, the plants are cut into pieces of similar size before freeze-drying. This ensures that the different pieces are in similar conditions (e.g., temperature and moisture content) during freeze-drying, thus achieving better freeze-drying results.

[0107] Furthermore, the plants are freeze-dried in a temperature range of -40℃ to 10℃. Within this temperature range, the pigments contained in the plants are prevented from denaturing to the greatest extent, preserving the original color of the plants and allowing the pigments to exist in the form of particles, thereby reducing the problem of easy fading of the resulting pigments.

[0108] In this embodiment of the invention, the plant is cut into pieces; the cut plant pieces are freeze-dried in a temperature range of -40°C to 10°C; and the freeze-dried plant is pulverized to obtain plant powder. This process prevents pigment denaturation, preserves the original color of the plant, and allows the pigment to exist in the form of particles, thereby reducing the problem of easy fading of the prepared pigment.

[0109] In one embodiment, the plant powder has a fineness greater than 800 mesh, and / or the pigment powder has a particle size less than 35 micrometers.

[0110] The plant powder mentioned above needs to be mixed with the paste binder. The fineness of the plant powder should be controlled to be greater than 800 mesh so that the plant powder and the paste binder can be mixed more easily and fully to obtain a mixed paste.

[0111] The pigment powder has a particle size of less than 35 micrometers, which makes it easier for the pigment to dissolve in water after being pressed into tablets, making it easier for painters to paint. At the same time, the particle size of the pigment powder is less than 35 micrometers, which makes the pigment particles finer after dissolving in water, resulting in a better painting effect.

[0112] In one embodiment, mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0113] The paste binder and the plant powder are mixed under preset conditions to obtain the mixed paste;

[0114] The preset conditions include at least one of the following:

[0115] The mixing temperature is below 20℃, the pH value is between 6 and 7.5, and the pressure is -0.9Pa.

[0116] It should be noted that since high temperature, excessively high or low pH value, and excessive pressure can all damage the molecular structure of pigments, it is necessary to set preset conditions to maintain the molecular structure of pigments and improve the color rendering effect of pigments.

[0117] In this embodiment of the invention, the preset conditions include at least one of the following: mixing temperature below 20°C, pH value between 6 and 7.5, and pressure of -0.9 Pa. By mixing the paste binder with the plant powder under the preset conditions, a mixed paste is obtained to maintain the molecular structure of the pigment and improve the color rendering effect of the pigment.

[0118] In one embodiment, the preparation of the paste adhesive based on a mixture of edible peach gum and edible starch includes:

[0119] A paste adhesive is prepared in enamel or ceramic equipment based on a mixture of edible gum and edible starch.

[0120] The process of freeze-drying the plant and then pulverizing the freeze-dried plant to obtain plant powder includes:

[0121] The plant is freeze-dried in an enamel or ceramic apparatus, and the freeze-dried plant is then pulverized to obtain the plant powder.

[0122] The step of mixing the paste binder with the plant powder to obtain a mixed paste includes:

[0123] The paste binder is mixed with the plant powder in an enamel or ceramic apparatus to obtain the mixed paste.

[0124] In this embodiment of the invention, containers are used to hold materials during the pigment preparation process, such as containers for mixing edible gum and edible starch, and containers for freeze-drying plants. To reduce the introduction of metal ions during the preparation process, enamel or ceramic equipment is used as containers in this embodiment of the invention to avoid discoloration of plant pigments caused by metal ions.

[0125] This invention also provides a schematic diagram of a pigment preparation process, as shown in the embodiments. Figure 2 As shown, the paste binder is prepared first: edible peach gum is dissolved in ultrapure water (110℃ to 115℃); after cooling, edible starch is added for thickening, and the thickening process is controlled at 65℃ to 75℃ for 20 minutes; then edible glycerin and a chelating agent are added, mixed, and cooled; finally, citric acid and potassium sorbate are added and mixed to prepare the paste binder. Next, plant powder is prepared: the plant is cut into pieces and then freeze-dried, with the freeze-drying temperature controlled at -40℃ to 10℃; the freeze-dried plant is then pulverized to a fineness higher than 800 mesh to prepare plant powder. Finally, pigment is prepared by mixing: the paste binder and plant powder are mixed using a vacuum enamel disperser, with the temperature controlled below 20℃, pH value between 6 and 7.5, and negative pressure at 0.9 Pa to obtain a mixed paste; the mixed paste is then air-dried at low temperature and pulverized to obtain pigment powder; the pigment powder is then compressed into tablets to obtain the pigment.

[0126] The above method of dissolving edible peach gum in ultrapure water (110℃ to 115℃) can be achieved by taking 100 parts of Grade I ultrapure water (resistivity ≥18MΩ*cm) and adding it into a pressure enamel container, then adding 10 to 15 parts of edible peach gum, turning on the stirrer, gradually raising the temperature to 110-115℃, and stirring until the peach gum particles are completely dissolved.

[0127] After cooling, add edible starch to thicken the mixture. The thickening process is controlled at 65°C to 75°C for 20 minutes. Alternatively, the gum syrup can be naturally cooled to below 75°C, and 6 to 8 parts of edible starch solution (starch and Grade I ultrapure water dispersed in a 1:3 ratio) can be slowly added for thickening. The temperature is controlled between 65°C and 75°C, and the thickening time is 20 minutes.

[0128] The above-mentioned addition of edible glycerin and chelating agent, followed by mixing and cooling, can be achieved by adding 2 to 3 parts of edible glycerin and 0.3 to 0.5 parts of chelating agent, and stirring until homogeneous.

[0129] The above-mentioned addition of citric acid and potassium sorbate can be done by adding citric acid and potassium sorbate after cooling (below 30°C) and dispersing them evenly to obtain a paste adhesive.

[0130] The above-mentioned process involves cutting plants into pieces and then freeze-drying them at a controlled temperature between -40℃ and 10℃. The freeze-dried plants are then pulverized to a fineness greater than 800 mesh to obtain plant powder. Specifically, this involves cutting plants into pieces, such as gardenia pulp, turmeric rhizome, and sophora japonica buds. These are then freeze-dried using a vacuum freeze dryer (temperature between -40℃ and 10℃), followed by pulverization using a ceramic pulverizer to a fineness greater than 800 mesh, producing plant pigments.

[0131] The above-mentioned method uses a vacuum enamel disperser to mix the paste binder and plant powder. Specifically, 5 to 8 parts of plant pigment are added to the paste binder, and the mixture is dispersed and vacuumed using a vacuum enamel disperser. The temperature is controlled below 20°C, the pH value is 6-7.5, and the negative pressure is 0.9 Pa to disperse the mixture evenly, thus obtaining a mixed paste.

[0132] The above-mentioned mixture is dried at low temperature and then pulverized to obtain pigment powder. Specifically, the mixture is dried under low temperature drying conditions to remove more than 95% of the moisture, and then pulverized to obtain a particle size of less than 35 micrometers.

[0133] This invention also provides a pigment prepared by any of the above pigment preparation methods. The pigment includes edible gum arabic, edible starch and pigments from plants. It does not cause harm to human health in the event of skin contact or accidental ingestion, and effectively improves the flexibility of pigment use.

[0134] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0135] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A method for preparing a pigment, characterized in that, include: A paste adhesive was prepared by mixing edible peach gum and edible starch; The plant is freeze-dried and then pulverized to obtain plant powder. The plant is a plant containing pigments, and the plant powder contains pigments. The paste binder is mixed with the plant powder to obtain a mixed paste; The mixed paste is air-dried, and the air-dried mixed paste is then pulverized to obtain pigment powder; The pigment powder is pressed into tablets to obtain the pigment.

2. The method as described in claim 1, characterized in that, The paste adhesive prepared based on a mixture of edible peach gum and edible starch includes: The edible peach gum is dissolved in ultrapure water within a set temperature range to obtain a peach gum solution; The gum solution is cooled, and edible starch is added to the cooled gum solution to obtain the paste adhesive.

3. The method as described in claim 2, characterized in that, After cooling the gum solution and adding edible starch to the cooled gum solution to obtain the paste adhesive, the method further includes: Edible glycerin and a chelating agent are added to the paste binder; The step of mixing the paste binder with the plant powder to obtain a mixed paste includes: The paste binder with added edible glycerin and chelating agent is mixed with the plant powder to obtain the mixed paste; The chelating agent is used to bind with metal ions in the paste adhesive to reduce the concentration of metal ions.

4. The method as described in claim 2, characterized in that, After cooling the gum solution and adding edible starch to the cooled gum solution to obtain the paste adhesive, the method further includes: Citric acid and potassium sorbate are added to the paste binder; The step of mixing the paste binder with the plant powder to obtain a mixed paste includes: The paste binder containing citric acid and potassium sorbate is mixed with the plant powder to obtain the mixed paste; The citric acid and potassium sorbate are used to extend the service life of the pigment.

5. The method as described in claim 2, characterized in that, After cooling the gum solution and adding edible starch to the cooled gum solution to obtain the paste adhesive, the method further includes: Edible glycerin, chelating agents, citric acid, and potassium sorbate are added to the paste binder; The step of mixing the paste binder with the plant powder to obtain a mixed paste includes: The paste binder containing edible glycerin, chelating agent, citric acid and potassium sorbate is mixed with the plant powder to obtain the mixed paste.

6. The method according to any one of claims 1 to 5, characterized in that, The process of freeze-drying the plant and then pulverizing the freeze-dried plant to obtain plant powder includes: Cut the plant into pieces; The cut plant was freeze-dried in a temperature range of -40°C to 10°C. The freeze-dried plant was pulverized to obtain the plant powder.

7. The method according to any one of claims 1 to 5, characterized in that, The plant powder has a fineness greater than 800 mesh, and / or the pigment powder has a particle size less than 35 micrometers.

8. The method according to any one of claims 1 to 5, characterized in that, The step of mixing the paste binder with the plant powder to obtain a mixed paste includes: The paste binder and the plant powder are mixed under preset conditions to obtain the mixed paste; The preset conditions include at least one of the following: The mixing temperature is below 20℃, the pH value is between 6 and 7.5, and the pressure is -0.9Pa.

9. The method according to any one of claims 1 to 5, characterized in that, The paste adhesive prepared based on a mixture of edible peach gum and edible starch includes: A paste adhesive is prepared in enamel or ceramic equipment based on a mixture of edible gum and edible starch. The process of freeze-drying the plant and then pulverizing the freeze-dried plant to obtain plant powder includes: The plant is freeze-dried in an enamel or ceramic apparatus, and the freeze-dried plant is then pulverized to obtain the plant powder. The step of mixing the paste binder with the plant powder to obtain a mixed paste includes: The paste binder is mixed with the plant powder in an enamel or ceramic apparatus to obtain the mixed paste.

10. A pigment, characterized in that, The pigment is prepared by any one of the pigment preparation methods according to claims 1 to 9.

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