A high-fastness dyeing method for natural agate

Abstract

This invention discloses a high-fastness dyeing method for natural agate, belonging to the field of agate dyeing and processing. The dyeing method includes the following steps: dissolving a disperse cationic dye in a weak acid, adding soft water and a leveling agent to prepare a dye solution with a concentration of 2-5 g / L, the pH range of which is 4.5-6.0; cleaning the natural agate, immersing it in the dye solution, and heating the dye solution to 75-85℃ for 5-10 days; after dyeing, cooling the dye solution to room temperature, adding a color-fixing powder whose color must be consistent with or complementary to the target color of the dye, and fixing for 5-10 days; removing, cleaning, and drying to obtain the dyed natural agate product. The high-fastness dyeing method for natural agate provided by this invention uses a combination of organic disperse cationic dye and color-fixing powder to dye agate, giving natural agate rich colors while maintaining good color fastness.

Description

Technical Field

[0001] This invention relates to the field of agate dyeing and processing, and specifically to a high-fastness dyeing method for natural agate. Background Technology

[0002] As people's demand for agate jewelry grows and their aesthetic requirements improve, they are enhancing the decorative and aesthetic appeal of stone by dyeing natural agate and other materials to make their colors more vibrant and richer.

[0003] There are four main methods for coloring natural agate: irradiation, heat treatment, inorganic dyeing, and organic dyeing. Among these, inorganic and organic dyeing are the most common. Typically, natural agate is placed in a solvent to dissolve organic dyes or inorganic pigments, and then soaked under reduced pressure, normal pressure, or pressure at room temperature or with heat. Alternatively, it can be sprayed or brushed to allow the coloring solution to penetrate the pores of the stone to achieve the desired coloring effect.

[0004] The prior art patent application CN107935630A, entitled "A Method for Coloring Agate Orange-Red," describes a method of immersing agate in a hydrothermal reaction vessel containing a dyeing solution of ferric nitrate. This allows the iron ions in the ferric nitrate solution to penetrate into the microporous structure of the agate. After baking, the iron ions undergo a chemical reaction inside the agate, forming a stable colored compound that gives the agate its orange-red color.

[0005] The prior art patent application CN1212961A, entitled "A New Technology for Dyeing Natural Stone," describes a method that involves first drying the natural stone, then immersing it in a dye solution containing ferric nitrate, and finally immersing it in a fixing solution for color fixation. Cooling is required after drying, and ferric nitrate is used for both dyeing and color fixation.

[0006] The invention patent application CN101274856B, which discloses a "method for dyeing natural stone and its products", involves baking natural stone and then immersing it in a color-fixing solution containing water-soluble dyes and auxiliaries. After cleaning and drying, the stone is then immersed in the color-fixing solution again for color fixation.

[0007] The invention patent application CN1212960A, which discloses a "new process for dyeing natural stone", requires cooling after drying and requires more than two dyeing and drying processes, which is time-consuming and labor-intensive. In addition, the dye used is non-water-soluble and contains organic solvents that pollute the environment.

[0008] Existing natural agate is dyed with organic dyes, resulting in a rich and comprehensive range of colors and varieties. However, the dyed products have poor color fastness and are prone to fading under sunlight. Summary of the Invention

[0009] The purpose of this invention is to provide a high-fastness dyeing method for natural agate, which solves the problem that the dyed products have poor color fastness and are prone to fading under sunlight when using organic dyes to dye natural agate.

[0010] This invention is achieved through the following technical solution:

[0011] This invention provides a high-fastness dyeing method for natural agate, the dyeing method comprising the following steps:

[0012] Disperse cationic dyes are dissolved in a weak acid, and then soft water and leveling agent are added to prepare a dye solution with a dye concentration of 2-5 g / L. The pH range of the dye solution is 4.5-6.0.

[0013] After cleaning the semi-finished natural agate with micropores ranging from 20 to 200 nm, it is placed in the dye solution for dyeing, and the dye solution is heated to 75 to 85°C for dyeing for 5 to 10 days.

[0014] After dyeing, the dye solution is cooled to room temperature, and a color-fixing powder is added to fix the color for 5-10 days. The color of the color-fixing powder is consistent with or complementary to the target color of the dye compound. The color-fixing powder includes organic color powder and / or inorganic color powder, the particle size range of the color-fixing powder is 10-50 nm, and the concentration range of the color-fixing powder is 300-400 g / L.

[0015] After the color fixation is completed, the dyed natural agate is removed, washed and dried to obtain a finished dyed agate product with a firm and uniform color.

[0016] More specifically, in the high-fastness dyeing method for natural agate, the dispersed cationic dye includes one or more of the following: dispersed cationic red series dyes, dispersed cationic yellow series dyes, or dispersed cationic blue series dyes.

[0017] Further specifying, in the high-fastness dyeing method for natural agate, the disperse cationic red series dyes include: disperse cationic red SD-GRL, disperse cationic red H-2GL, disperse cationic red SD-FG, disperse cationic red SD-2GL, or disperse cationic brilliant red SD-5GN.

[0018] Further specifying, in the high-fastness dyeing method for natural agate, the disperse cationic yellow series dyes include: disperse cationic yellow SD-3RL, disperse cationic yellow SD-5GL, disperse cationic yellow SD-7GL, disperse cationic yellow SD-GRL, or disperse cationic golden yellow SD-GL.

[0019] Further specifying, in the high-fastness dyeing method for natural agate, the disperse cationic blue series dyes include: disperse cationic blue SD-BL, disperse cationic blue SD-GRL, disperse cationic blue SD-GSL, disperse cationic turquoise blue SD-GB, or disperse cationic brilliant blue SD-2RL.

[0020] More specifically, in the high-fastness dyeing method for natural agate, the weak acid includes glacial acetic acid or formic acid.

[0021] More specifically, in the high-fastness dyeing method for natural agate, the total content of the leveling agent is 5~8g / L.

[0022] More specifically, in the high-fastness dyeing method for natural agate, the leveling agent comprises: 3.3~5.3 g / L of cationic surfactant and 1.7~2.7 g / L of nonionic surfactant.

[0023] More specifically, in the high-fastness dyeing method for natural agate, the cationic surfactant is dodecyl dimethyl benzyl ammonium chloride; and the nonionic surfactant is fatty alcohol polyoxyethylene ether.

[0024] More specifically, in the high-fastness dyeing method for natural agate, the organic fixing powder includes: azo organic pigments or phthalocyanine organic pigments;

[0025] The inorganic pigments include: iron oxide series or ultramarine series; the iron oxide series includes: iron oxide red, iron oxide yellow, and iron oxide blue; the ultramarine pigment series includes: phthalocyanine blue and phthalocyanine green.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] The present invention provides a high-fastness dyeing method for natural agate, which uses organic disperse cationic dyes combined with fixing powder to dye agate, so that natural agate has rich colors while also having good color fastness.

[0028] The high-fastness dyeing method for natural agate provided by this invention introduces a fixing powder for intermediate color fixation based on the initial stage of using disperse cationic dye as an organic dye. The fixing powder with a small particle size (10-50nm) is adapted to the micropores (20-200nm) of agate, and after physical filling, a "dye-fixing powder" composite color layer is formed. This method can not only fill the micropores and lock the dye, but also use the excellent lightfastness of the fixing powder itself to shield the decomposition of the dye by ultraviolet rays. At the same time, it simplifies the process and reduces costs, which is an innovative process improvement.

[0029] The high-fastness dyeing method for natural agate provided by this invention ensures the stability of dispersed cationic dyes by controlling the pH value of the dye solution, promoting dye ionization and penetration into the micropores of agate; it also opens the micropores of agate by controlling the dyeing temperature, promoting deep penetration of the dispersed cationic dyes, while the electrostatic adsorption of the cationic dyes on the weakly negatively charged surface of the agate micropores further fixes the dyes. This dyeing method strictly controls the process conditions, providing a foundation for achieving rich colors in dyed agate while maintaining good color fastness. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The illustrative embodiments and descriptions of this invention are for explanation only and are not intended to limit the invention. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0031] This invention provides a high-fastness dyeing method for natural agate, the dyeing method comprising the following steps:

[0032] Disperse cationic dyes are dissolved in a weak acid, and soft water and leveling agent are added to prepare a dye solution with a concentration of 2-5 g / L of disperse cationic dyes, wherein the pH range of the dye solution is 4.5-6.0.

[0033] After cleaning the semi-finished natural agate with a micropore range of 20~200nm, it is placed in the dye solution for dyeing, and the dye solution is heated to 75~85℃ for dyeing for 5~10 days. The micropore range of natural agate can be 20nm, 40nm, 60nm, 80nm, 100nm, 120nm, 140nm, 160nm, 180nm, 200nm, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0034] After dyeing, the dye solution is cooled to room temperature, and a color-fixing powder is added for 5-10 days. The color of the color-fixing powder must be consistent with or complementary to the target color of the dye compound. The color-fixing powder includes organic and / or inorganic color powders, with a particle size range of 10-50 nm, including but not limited to 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, and 50 nm. Other unlisted values ​​within this range are also applicable. The concentration range is 300-400 g / L, including but not limited to 300 g / L, 320 g / L, 340 g / L, 360 g / L, 380 g / L, and 400 g / L. Other unlisted values ​​within this range are also applicable. After color fixing, the dyed natural agate is removed, washed, and dried to obtain the final dyed product.

[0035] The high-fastness dyeing method for natural agate provided by this invention effectively solves the problems of low color fastness and easy fading after sun exposure in existing technologies that use organic dyes for dyeing agate. This is achieved by using disperse cationic dyes for initial dyeing and fixing powder for intermediate color fixation. Tests show that agate dyed according to this invention shows no significant fading after 50-100 days of exposure to natural light, and exhibits good acid and alkali resistance, making it less prone to color fading during daily wear.

[0036] The present invention provides a high-fastness dyeing method for natural agate, which can make agate present a richer and more diverse and brighter colors, satisfying the color preferences and aesthetic needs of different consumers. When used to make jewelry or handicrafts, it can be matched with various clothing, adding beauty to the wearer or environment, and has high decorative value.

[0037] This invention provides a high-fastness dyeing method for natural agate, using dispersed cationic dyes as organic dyes and strictly controlling the pH of the dye solution within a weakly acidic range of 4.5-6.0. This range ensures the stability of the dispersed cationic dyes, promotes dye ionization and penetration into the micropores of agate, and avoids dyeing failure due to unsuitable pH. Simultaneously, the dye concentration is controlled at 2-5 g / L (total concentration of the compound ≤ 5 g / L) to suit the dyeing requirements of agate. Adjusting the pH of the dye solution to a weakly acidic range of 4.5-6.0 is crucial. If the pH is too low (< 4.0), it may damage the agate structure and cause excessive dye ionization and aggregation, leading to uneven coloring after dyeing. If the pH is too high (> 6.5), the dye dispersion deteriorates, penetration efficiency decreases, and dyeing depth is insufficient. For example, adding 6-8 drops (0.3-0.4 mL) of glacial acetic acid per 150 mL of dye solution can stabilize the pH within the target range; if formic acid is used instead, the amount can be reduced to 5-7 drops due to its slightly stronger acidity.

[0038] The high-fastness dyeing method for natural agate provided by this invention uses a high temperature of 75~85℃ for dyeing. This temperature setting can open the micropores of agate and promote the deep penetration of dispersed cationic dyes. The electrostatic adsorption of cationic dyes with the weakly negatively charged surface of agate micropores can further fix the dyes.

[0039] This invention provides a high-fastness dyeing method for natural agate, which, based on disperse cationic dyes as organic dyes, introduces a fixing powder for mid-term color fixation. In the field of natural stone dyeing, traditional color fixation mainly relies on "dye self-fixation" (such as high-temperature fixation, auxiliary agent fixation), but agate has a special microporous structure (small pore size, large specific surface area), making it difficult for conventional auxiliaries to achieve long-term fixation. This invention introduces "chemical dyeing + physical filling with fixing powder" into agate dyeing for the first time. The particle size of the fixing powder (10-50nm) is adapted to the micropores of agate (20-200nm), and after physical filling, a "dye-fixing powder" composite color layer is formed. This not only fills the micropores and locks in the dye, but also utilizes the excellent lightfastness of the fixing powder itself to shield the dye from ultraviolet decomposition. At the same time, it simplifies the process and reduces costs, representing an innovative process improvement.

[0040] More specifically, in the high-fastness dyeing method for natural agate, the dispersed cationic dye includes one or more of the dispersed cationic red series, dispersed cationic yellow series, or dispersed cationic blue series.

[0041] More specifically, the dispersed cationic red series dyes include: dispersed cationic red SD-GRL, dispersed cationic red H-2GL, dispersed cationic red SD-FG, dispersed cationic red SD-2GL, or dispersed cationic brilliant red SD-5GN.

[0042] More specifically, the disperse cationic yellow series dyes include: disperse cationic yellow SD-3RL, disperse cationic yellow SD-5GL, disperse cationic yellow SD-7GL, disperse cationic yellow SD-GRL, or disperse cationic golden yellow SD-GL.

[0043] More specifically, the disperse cationic blue series dyes include: disperse cationic blue SD-BL, disperse cationic blue SD-GRL, disperse cationic blue SD-GSL, disperse cationic turquoise blue SD-GB, or disperse cationic brilliant blue SD-2RL.

[0044] In the high-fastness dyeing method for natural agate provided by this invention, the dispersed cationic dye can be a single-color base dye: dispersed cationic red series (such as SD-GRL, H-2GL, etc.), which can provide bright red hues and is suitable for color matching needs such as red and purple; dispersed cationic yellow series (such as SD-3RL, H-5GL, etc.), which is used to mix yellow, green, orange, and other colors; and dispersed cationic blue series (such as SD-BL, H-4RL, etc.), which provides a basic blue hue for color matching such as blue, purple, and green. The dispersed cationic dye can also be any two of the above-mentioned single-color base dyes or a compound dye of the above three single-color base dyes to obtain target colors that meet various needs.

[0045] Further specifying, the weak acid includes: glacial acetic acid or formic acid.

[0046] More specifically, the total amount of the leveling agent is 5~8 g / L.

[0047] More specifically, the leveling agent comprises: 3.3~5.3 g / L of cationic surfactant and 1.7~2.7 g / L of nonionic surfactant.

[0048] More specifically, the cationic surfactant is dodecyl dimethyl benzyl ammonium chloride; and the nonionic surfactant is fatty alcohol polyoxyethylene ether.

[0049] More specifically, the organic pigments include: azo and / or phthalocyanine compounds;

[0050] The inorganic pigments include: iron oxide series and / or ultramarine series; the iron oxide series includes: iron oxide red, iron oxide yellow, and iron oxide blue; the ultramarine pigment series includes: phthalocyanine blue and phthalocyanine green.

[0051] The high-fastness dyeing method for natural agate provided by this invention includes the following types of fixing powders: Organic color powders: azo dyes (such as permanent red and permanent yellow), which have bright colors and strong tinting strength, suitable for fixing basic colors such as red and yellow; phthalocyanine dyes (such as phthalocyanine blue and phthalocyanine green), which have excellent lightfastness and weather resistance, suitable for color matching scenarios such as blue and green. Inorganic color powders: iron oxide series (such as iron oxide red and iron oxide yellow), which have high stability but slightly lower color saturation; ultramarine series, which can provide bright blue tones and have good lightfastness.

[0052] The color of the fixing powder must be consistent with or complementary to the target color of the dye (e.g., if the dye produces purple, the color powder should be "red + blue composite color powder") to ensure color uniformity after fixing and avoid color shift.

[0053] The amount of fixing powder used is related to the volume of the dye liquor and the dye concentration. If the dye concentration is high (such as multi-color blending, with the total dye percentage > 10%), the fixing powder can be increased to 360~400g / L to strengthen the fixing layer; if the dye concentration is low (such as light-colored dyeing, with the total dye percentage < 5%), the fixing powder can be reduced to 300~360g / L to avoid the color being too dark.

[0054] In addition, the fixing powder needs to be easily dispersed in the dyeing solution (this can be achieved through pre-dispersion treatment, such as mixing and grinding with a small amount of leveling agent) to prevent agglomeration and clogging of the agate micropores; priority should be given to fixing powder with a lightfastness grade ≥6 (GB / T 1865-2009 standard) to ensure that it does not decompose or fade under sunlight and room temperature conditions, and to work with the dye to form a stable color layer.

[0055] To further illustrate the present invention, the following describes a high-fastness dyeing method for natural agate provided by the present invention in conjunction with embodiments. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. They are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0056] In the examples below, the micropores of the natural agate are in the range of 60 nm; the particle size of the color-fixing powder is in the range of 30 nm.

[0057] Example 1:

[0058] The high-fastness dyeing method for natural agate provided in this embodiment specifically includes the following steps:

[0059] (1) Select natural agate, wash it with deionized water and wipe it dry with a towel or let it air dry naturally;

[0060] (2) Weigh 60% of Disperse Cationic Red SD-GRL + 40% of Disperse Cationic Turquoise Blue SD-BL, add glacial acetic acid to dissolve (add 6 drops (0.3 mL) per 150 mL of dye solution, adjust the pH of the dye solution to 6), add soft boiling water and 5 g / L of leveling agent (3.3 g / L of dodecyl dimethyl benzyl ammonium chloride and 1.7 g / L of fatty alcohol polyoxyethylene ether, the concentration of disperse cationic dye is 2 g / L);

[0061] (3) Add agate, put the dye solution into a constant temperature water bath, turn on the circulation pump to circulate the dye solution, set the temperature to 75℃, and the time to 10 days.

[0062] (4) Add phthalocyanine blue (300g / L) to the dye solution containing agate at room temperature and continue dyeing for 10 days;

[0063] (5) Remove the agate, clean and dry it to obtain the dyed natural agate product.

[0064] In this embodiment, the dyed natural agate product appears purple. After the product is placed under natural light for 50 days, there is no obvious color difference compared with the standard sample.

[0065] Acid resistance test:

[0066] Referring to the core principles of (GB / T9966.6-2020), due to the special material properties of dyed agate (including artificial dyeing layers), the test parameters were adjusted to suit the performance evaluation of the dyeing layer. Conditions: (23±2)℃, pH=4.0 acetic acid solution (prepared by adding 2.4 mL of glacial acetic acid to 1000 mL of deionized water), soaked for 24 hours. Test method: The sample was removed, and the surface was rinsed with deionized water to remove residual solution. After drying to constant weight, the CIE LAB color difference (ΔE) of the sample before and after soaking was measured using a colorimeter (to improve the accuracy of the experiment, the data in this embodiment are rounded to two decimal places), and the surface was observed for corrosion, discoloration, or cracks.

[0067] The acid resistance test results of the dyed natural agate obtained in Example 1 were: ΔE=1.80 (≤2.50), no surface corrosion, moderate color, and no obvious fading.

[0068] Example 2:

[0069] The high-fastness dyeing method for natural agate provided in this embodiment specifically includes the following steps:

[0070] (1) Select natural agate, wash it with deionized water and wipe it dry with a towel or let it air dry naturally;

[0071] (2) Weigh 60% of Disperse Cationic Turquoise Blue SD-BL + 40% of Disperse Cationic Yellow SD-3RL, add glacial acetic acid to dissolve (add 7 drops (0.35 mL) per 150 mL of dye solution, adjust the pH of the dye solution to 5), add soft boiling water and 8 g / L of leveling agent (5.3 g / L of dodecyl dimethyl benzyl ammonium chloride and 2.7 g / L of fatty alcohol polyoxyethylene ether, the concentration of the dispersed cationic dye is 3.5 g / L);

[0072] (3) Add agate, put the dye solution into a constant temperature water bath, set the temperature to 80℃, and the time to 7 days;

[0073] (4) Add red fixing powder - permanent red (360g / L) to the dye solution containing agate at room temperature and continue dyeing for 7 days.

[0074] (5) Remove the agate, clean and dry it to obtain the dyed natural agate product.

[0075] In this embodiment, the dyed natural agate product appears green. After the product is exposed to natural light for 80 days, there is no obvious color difference compared with the standard sample.

[0076] Acid resistance test:

[0077] Referring to the core principles of (GB / T9966.6-2020), and considering the unique material properties of dyed agate (including artificial dyeing layers), the test parameters were adjusted to suit the performance evaluation of the dyeing layer. Conditions: (23±2)℃, pH=4.0 acetic acid solution (prepared by adding 2.4 mL of glacial acetic acid to 1000 mL of deionized water), soaked for 24 hours. Test method: The sample was removed, and the surface was rinsed with deionized water to remove residual solution. After drying to constant weight, the CIE LAB color difference (ΔE) of the sample before and after soaking was measured using a colorimeter. The presence of corrosion, discoloration, or cracks on the surface was observed.

[0078] The acid resistance test results of the dyed natural agate obtained in Example 2 were: ΔE=1.22 (≤2.50), the surface was intact, and the color was consistent with the un-soaked sample.

[0079] Example 3:

[0080] The high-fastness dyeing method for natural agate provided in this embodiment specifically includes the following steps:

[0081] (1) Select natural agate, wash it with deionized water and wipe it dry with a towel or let it air dry naturally.

[0082] (2) Weigh 10% Disperse Cationic Turquoise Blue SD-BL + 65% Disperse Cationic Yellow SD-3RL + 25% Disperse Cationic Red SD-GRL, add glacial acetic acid to dissolve (add 8 drops (0.4 mL) per 150 mL of dye solution, adjust the pH of the dye solution to 4.5), add soft boiling water and 7.5 g / L leveling agent (5 g / L of dodecyl dimethyl benzyl ammonium chloride and 2.5 g / L of fatty alcohol polyoxyethylene ether, the concentration of disperse cationic dye is 5 g / L);

[0083] (3) Add agate, put the dye solution into a constant temperature water bath, set the temperature to 85℃, and the time to 5 days;

[0084] (4) Add red fixing powder - permanent red (400g / L) to the dye solution containing agate at room temperature and continue dyeing for 5 days.

[0085] (5) Remove the agate, clean and dry it to obtain the dyed natural agate product.

[0086] In this embodiment, the dyed natural agate product appears yellowish-green. After the product is exposed to natural light for 100 days, there is no obvious color difference compared with the standard sample.

[0087] Acid resistance test:

[0088] Referring to the core principles of (GB / T9966.6-2020), and considering the unique material properties of dyed agate (including artificial dyeing layers), the test parameters were adjusted to suit the performance evaluation of the dyeing layer. Conditions: (23±2)℃, pH=4.0 acetic acid solution (prepared by adding 2.4 mL of glacial acetic acid to 1000 mL of deionized water), soaked for 24 hours. Test method: The sample was removed, and the surface was rinsed with deionized water to remove residual solution. After drying to constant weight, the CIE LAB color difference (ΔE) of the sample before and after soaking was measured using a colorimeter. The presence of corrosion, discoloration, or cracks on the surface was observed.

[0089] The acid resistance test results of the dyed natural agate obtained in Example 3 were: ΔE=2.30 (≤2.50), with a small amount of color spots appearing on the surface and a decrease in color saturation. The product met the standards.

[0090] 1.1 Effect of Disperse Cationic Dye Dosage on Dyeing Effect

[0091] Referring to the high-fastness dyeing method for natural agate provided in Example 1, the concentrations of disperse cationic dyes were set to 1 g / L, 2 g / L, 3 g / L, 4 g / L, 5 g / L, and 6 g / L, respectively, to investigate the effect of the amount of disperse cationic dye on the dyeing effect. After the dyed products were placed under natural light for 50 days, they were compared with standard samples and acid resistance tests were conducted. The test results are shown in Table 1.

[0092] Table 1. Effects of disperse cationic dye concentration on the dyeing effect and acid resistance of natural agate.

[0093]

[0094] As shown in Table 1, when the concentration of the disperse cationic dye is too low (1 g / L), the dyed natural agate has a light color, fades significantly after exposure to light, and fails the acid resistance test. When the concentration of the disperse cationic dye is too high (6 g / L), the dyed natural agate has an uneven color, with localized color spots, and fails the acid resistance test. When the concentration of the disperse cationic dye is between 2 and 5 g / L, the dyed natural agate has a bright color, shows no obvious fading, and passes the acid resistance test.

[0095] 1.2 Effect of Temperature on Staining Effect

[0096] Referring to the high-fastness dyeing method for natural agate provided in Example 1, the dyeing heating temperatures were set to 70℃, 75℃, 80℃, 85℃, and 90℃ respectively to investigate the effect of dyeing heating temperature on the dyeing effect. After the dyed products were exposed to natural light for 50 days, they were compared with standard samples and acid resistance tests were conducted. The test results are shown in Table 2.

[0097] Table 2. Effects of dyeing heating temperature on the dyeing effect and acid resistance of natural agate.

[0098]

[0099] As shown in Table 2, when the dyeing heating temperature is too low (70℃), the dyed natural agate passes the acid resistance test, but the color is too light and fades significantly after exposure to light. When the dyeing heating temperature is too high (90℃), the dyed natural agate is slightly darker in color, with slight local color changes, and fails the acid resistance test. When the dyeing heating temperature is between 75 and 85℃, the dyed natural agate has a bright color, no obvious fading, and passes the acid resistance test.

[0100] 1.3 Effect of the amount of fixing powder on the dyeing effect.

[0101] Referring to the high-fastness dyeing method for natural agate provided in Example 1, the amount of fixing powder was set to 250 g / L, 300 g / L, 350 g / L, 380 g / L, 400 g / L, and 450 g / L, respectively, to investigate the effect of fixing powder dosage on the dyeing effect. After dyeing, the agate was exposed to natural light for 50 days, and the results were compared with the standard sample and subjected to acid resistance tests. The test results are shown in Table 3.

[0102] Table 3. Effects of the dosage of color-fixing powder on the dyeing effect and acid resistance of natural agate.

[0103]

[0104] As shown in Table 3, when the amount of color-fixing powder is too low (250 g / L), the dyed natural agate is slightly lighter in color, slightly fades, and fails the acid resistance test. When the amount of color-fixing powder is too high (450 g / L), the dyed natural agate passes the acid resistance test, but the color is slightly darker and there is no fading. When the amount of color-fixing powder is between 300 and 400 g / L, the dyed natural agate has a bright color, no obvious fading, and passes the acid resistance test.

[0105] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-fastness dyeing method for natural agate, characterized in that, The staining method includes the following steps: The disperse cationic dye is dissolved in a weak acid, and soft water and leveling agent are added to prepare a dye solution with a disperse cationic dye concentration of 2~5 g / L, wherein the pH range of the dye solution is 4.5-6.0; After cleaning the semi-finished natural agate with micropores ranging from 20 to 200 nm, it is placed in the dye solution for dyeing, and the dye solution is heated to 75 to 85°C for dyeing for 5 to 10 days. After dyeing, the dye solution is cooled to room temperature, and a color-fixing powder is added to fix the color for 5-10 days. The color of the color-fixing powder is consistent with or complementary to the target color of the dye compound. The color-fixing powder includes organic color powder and / or inorganic color powder, the particle size range of the color-fixing powder is 10-50 nm, and the concentration range of the color-fixing powder is 300-400 g / L. After the color fixation is completed, the dyed natural agate is removed, washed and dried to obtain the finished dyed natural agate product.

2. The high-fastness dyeing method for natural agate according to claim 1, characterized in that, The dispersed cationic dyes include one or more of the following: dispersed cationic red series dyes, dispersed cationic yellow series dyes, or dispersed cationic blue series dyes.

3. The high-fastness dyeing method for natural agate according to claim 2, characterized in that, The dispersed cationic red series dyes include: dispersed cationic red SD-GRL, dispersed cationic red H-2GL, dispersed cationic red SD-FG, dispersed cationic red SD-2GL or dispersed cationic brilliant red SD-5GN.

4. The high-fastness dyeing method for natural agate according to claim 2, characterized in that, The dispersed cationic yellow series dyes include: dispersed cationic yellow SD-3RL, dispersed cationic yellow SD-5GL, dispersed cationic yellow SD-7GL, dispersed cationic yellow SD-GRL or dispersed cationic golden yellow SD-GL.

5. The high-fastness dyeing method for natural agate according to claim 2, characterized in that, The disperse cationic blue series dyes include: disperse cationic blue SD-BL, disperse cationic blue SD-GRL, disperse cationic blue SD-GSL, disperse cationic turquoise blue SD-GB, or disperse cationic brilliant blue SD-2RL.

6. The high-fastness dyeing method for natural agate according to claim 1, characterized in that, The weak acids include glacial acetic acid or formic acid.

7. The high-fastness dyeing method for natural agate according to claim 1, characterized in that, The total content of the leveling agent is 5~8g / L.

8. The high-fastness dyeing method for natural agate according to claim 7, characterized in that, The leveling agent comprises 3.3~5.3 g / L of cationic surfactant and 1.7~2.7 g / L of nonionic surfactant used in combination.

9. The high-fastness dyeing method for natural agate according to claim 8, characterized in that, The cationic surfactant is dodecyl dimethyl benzyl ammonium chloride; the nonionic surfactant is fatty alcohol polyoxyethylene ether.

10. The high-fastness dyeing method for natural agate according to claim 1, characterized in that, The organic pigments include: azo or phthalocyanine compounds; The inorganic pigments include: iron oxide series or ultramarine pigment series; the iron oxide series includes: iron oxide red, iron oxide yellow or iron oxide blue; the ultramarine pigment series includes: phthalocyanine blue or phthalocyanine green.

Images