High-color-fastness dye, preparation method and application thereof, and preparation method of high-color-fastness suede microfiber leather

Abstract

The invention belongs to the technical field of artificial leather, and particularly relates to a high-color-fastness dye, a preparation method and application thereof, and a preparation method of high-color-fastness suede microfiber leather. The high-color-fastness dye provided by the invention comprises the following components in parts by mass: 7-15 parts of a coloring agent and 85-93 parts of a coating, the coloring agent is prepared from 3 to 8 parts of dispersing agent, 1 to 5 parts of wetting agent, 28 to 38 parts of pigment, 0.1 to 0.5 part of defoaming agent and 30 to 50 parts of water; the dispersing agent is an acrylic acid modified polymer dispersing agent; the coating is prepared from 45 to 65 parts of waterborne polyurethane dispersoid, 30 to 45 parts of polycarbonate resin, 0.5 to 1 part of defoaming agent, 1 to 2 parts of flatting agent, 1 to 2 parts of wear-resistant additive, 0.5 to 2 parts of thickening agent, 4 to 5 parts of cross-linking agent and 10 to 35 parts of water, the cross-linking agent is an aziridine cross-linking agent. The high-color-fastness dye provided by the invention can obviously improve the color fastness, and the prepared product is not easy to decolorize.

Description

Technical Field

[0001] This invention belongs to the field of artificial leather technology, specifically relating to a high color fastness dye and its preparation method and application, and a method for preparing high color fastness suede microfiber leather. Background Technology

[0002] Currently available microfiber fabrics with either fixed or non-fixed island finishes on the market have performance indicators including water fastness, acid perspiration fastness, alkaline perspiration fastness, and wet and dry rubbing fastness. Failure to meet these standards can cause leather to fade, affecting its appearance, and in more serious cases, the color may transfer to clothing or skin, harming human health. Products with poor colorfastness may release dyes or pigments into rainwater and sweat during wear. The molecules and heavy metal ions in these dyes or pigments can be absorbed through the skin, causing itching in the areas in contact with the body, and in severe cases, erythema, eczema, etc., thus harming human skin health.

[0003] Therefore, improving the colorfastness of suede microfiber leather is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a high color fastness dye, its preparation method and application, and a method for preparing high color fastness suede microfiber leather. Products made from the high color fastness dye provided by this invention are not prone to fading.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The present invention provides a dye with high color fastness, comprising, by weight parts, 7-15 parts of colorant and 85-93 parts of coating;

[0007] The colorant comprises 3-8 parts of dispersant, 1-5 parts of wetting agent, 28-38 parts of pigment, 0.1-0.5 parts of first defoamer, and 30-50 parts of first water; the dispersant is an acrylic acid modified polymer dispersant.

[0008] The coating comprises 45-65 parts of waterborne polyurethane dispersion, 30-45 parts of polycarbonate resin, 0.5-1 part of second defoamer, 1-2 parts of leveling agent, 1-2 parts of wear-resistant additive, 0.5-2 parts of thickener, 4-5 parts of crosslinking agent, and 10-35 parts of second water; the crosslinking agent is an aziridine crosslinking agent.

[0009] Preferably, the wetting agent is a fatty alcohol polyoxyethylene ether wetting agent;

[0010] The pigments include one or more of phthalocyanine blue, pigment red, carbon black, and pigment yellow.

[0011] Preferably, the first defoamer and the second defoamer are independently silicone defoamers.

[0012] Preferably, the elastic modulus of the aqueous polyurethane dispersion is 25–30 Pa;

[0013] The elastic modulus of the polycarbonate resin is 30-35 Pa.

[0014] The present invention also provides a method for preparing the high color fastness dye described in the above technical solution, comprising the following steps:

[0015] The dispersant, wetting agent, pigment, first defoamer and first water are mixed and ground to obtain the colorant;

[0016] A coating is obtained by mixing an aqueous polyurethane dispersion, polycarbonate resin, a second defoamer, a leveling agent, an abrasion-resistant agent, a thickener, a crosslinking agent, and a second water.

[0017] The colorant and coating are mixed to obtain the high color fastness dye.

[0018] Preferably, the particle size of the ground pigment D97 is less than 5 μm.

[0019] The present invention also provides the application of the high color fastness dyes described in the above technical solutions or the high color fastness dyes obtained by the preparation methods described in the above technical solutions in the dyeing of microfiber leather.

[0020] This invention also provides a method for preparing high color fastness suede microfiber leather, comprising the following steps:

[0021] High colorfastness microfiber leather is obtained by coating both sides of the suede microfiber leather with a high colorfastness dye and baking it; the high colorfastness dye is the high colorfastness dye described in the above technical solution or the high colorfastness dye obtained by the preparation method described in the above technical solution.

[0022] Preferably, the coating is performed by roller coating; the coating is performed 2 to 3 times.

[0023] Preferably, the baking temperature is 110–150°C and the baking time is 5–15 minutes.

[0024] This invention provides a high color fastness dye, comprising, by weight parts, 7-15 parts of colorant and 85-93 parts of coating; the colorant comprises 3-8 parts of dispersant, 1-5 parts of wetting agent, 28-38 parts of pigment, 0.1-0.5 parts of first defoamer, and 30-50 parts of first water; the dispersant is an acrylic modified polymer dispersant; the coating comprises 45-65 parts of waterborne polyurethane dispersion, 30-45 parts of polycarbonate resin, 0.5-1 part of second defoamer, 1-2 parts of leveling agent, 1-2 parts of abrasion resistant agent, 0.5-2 parts of thickener, 4-5 parts of crosslinking agent, and 10-35 parts of second water; the crosslinking agent is an aziridine crosslinking agent. This invention innovatively provides a dye system combining a colorant and a coating. The colorant is a dispersant with excellent water resistance, and the coating is a polyurethane and polycarbonate resin with good water resistance. At the same time, the carboxyl groups in the resin react vigorously with the aziridine crosslinking agent, increasing the crosslinking density of the paint film and giving the coating a high-fastness color fixation effect. The resulting high-fastness dye is suitable for both fixed-island and non-fixed-island microfibers, significantly improving color fastness. The resulting product is not easy to fade and can pass performance tests such as water fastness, acid perspiration fastness, alkaline perspiration fastness, and dry and wet rubbing fastness, meeting international standards and market demands. Detailed Implementation

[0025] The present invention provides a dye with high color fastness, comprising, by weight parts, 7-15 parts of colorant and 85-93 parts of coating;

[0026] The colorant comprises 3-8 parts of dispersant, 1-5 parts of wetting agent, 28-38 parts of pigment, 0.1-0.5 parts of first defoamer, and 30-50 parts of first water; the dispersant is an acrylic acid modified polymer dispersant.

[0027] The coating comprises 45-65 parts of waterborne polyurethane dispersion, 30-45 parts of polycarbonate resin, 0.5-1 part of second defoamer, 1-2 parts of leveling agent, 1-2 parts of wear-resistant additive, 0.5-2 parts of thickener, 4-5 parts of crosslinking agent, and 10-35 parts of second water; the crosslinking agent is an aziridine crosslinking agent.

[0028] In this invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0029] In this invention, the high color fastness dye, colorant and coating have independent mass fraction systems.

[0030] The high color fastness dye provided by the present invention comprises 7 to 15 parts of colorant, preferably 9 to 13 parts, by weight.

[0031] Based on the mass fraction of the colorant, the high color fastness dye provided by the present invention further includes 85 to 93 parts of coating, preferably 87 to 91 parts.

[0032] The colorant comprises 3 to 8 parts, preferably 4 to 6 parts, of a dispersant, by weight; the dispersant is an acrylic modified polymer dispersant; the acrylic modified polymer dispersant is preferably Clariant 2779.

[0033] Based on the mass fraction of the dispersant, the colorant further includes 1 to 5 parts of a wetting agent, preferably 2 to 4 parts; the wetting agent is preferably a fatty alcohol polyoxyethylene ether wetting agent; the type of the fatty alcohol polyoxyethylene ether wetting agent is preferably Dow CF-10.

[0034] Based on the mass fraction of the dispersant, the colorant further includes 28-38 parts of pigment, preferably 30-36 parts, more preferably 32-34 parts; the pigment preferably includes one or more of phthalocyanine blue, pigment red, carbon black and pigment yellow; the pigment is preferably Clariant pigment; the phthalocyanine blue is preferably phthalocyanine blue P.B15:3; the pigment red is preferably pigment red R254; the carbon black is preferably furnace black P.BL.6; the pigment yellow is preferably pigment yellow Y83.

[0035] Based on the mass fraction of the dispersant, the colorant further includes 0.1 to 0.5 parts of a first defoamer, preferably 0.2 to 0.4 parts; the first defoamer is preferably an organosilicon defoamer; the organosilicon defoamer is preferably Evonik Tego810 or Evonik Tego902W.

[0036] Based on the mass fraction of the dispersant, the colorant further includes 30 to 50 parts of first water, preferably 35 to 50 parts, and more preferably 35 to 45 parts.

[0037] The coating comprises, by weight, 45-65 parts, preferably 50-65 parts, and more preferably 50-60 parts, of an aqueous polyurethane dispersion; the elastic modulus of the aqueous polyurethane dispersion is preferably 25-30 Pa, and more preferably 25-28 Pa; the preferred type of the aqueous polyurethane dispersion is Guangzhou Guiling New Materials WPU2682.

[0038] Based on the mass fraction of the waterborne polyurethane dispersion, the coating further includes 30-45 parts of polycarbonate resin, preferably 35-42 parts; the elastic modulus of the polycarbonate resin is preferably 30-35 Pa, more preferably 30-33 Pa; the type of the polycarbonate resin is preferably Zhongfang Chemical polycarbonate resin PU808.

[0039] Based on the mass fraction of the waterborne polyurethane dispersion, the coating further includes 0.5 to 1 part of a second defoamer, preferably 0.6 to 0.9 parts; the second defoamer is preferably an organosilicon defoamer; the organosilicon defoamer is preferably Evonik Tego810 or Evonik Tego902W.

[0040] In this invention, limiting the elastic modulus of the waterborne polyurethane dispersion and polycarbonate resin to the above-mentioned range helps to obtain a plush microfiber with better wear resistance. If the elastic modulus is too high, the plush microfiber has a large resistance to elastic deformation, but the fabric is hard and has a poor feel; if the elastic modulus is too low, the plush microfiber has a small resistance to elastic deformation, the polyurethane resin is easy to fall off, and the wear resistance is poor.

[0041] Based on the mass fraction of the waterborne polyurethane dispersion, the coating further includes 1 to 2 parts of a leveling agent, preferably 1.2 to 1.8 parts; the leveling agent is preferably a wetting leveling agent.

[0042] Based on the mass fraction of the waterborne polyurethane dispersion, the coating further includes 1 to 2 parts of abrasion-resistant additive, preferably 1.2 to 1.8 parts; the abrasion-resistant additive is preferably a hand-feel abrasion-resistant additive.

[0043] Based on the mass fraction of the waterborne polyurethane dispersion, the coating further includes 0.5 to 2 parts of thickener, preferably 0.8 to 1.6 parts; the thickener is preferably a medium-low shear thickener; the type of the medium-low shear thickener is preferably Haimingsi 299.

[0044] Based on the mass fraction of the waterborne polyurethane dispersion, the coating further includes 4 to 5 parts of a crosslinking agent, preferably 4.2 to 4.8 parts; the type of the aziridine crosslinking agent is preferably DSM CX100.

[0045] In this invention, the crosslinking agent interacts with the carboxyl groups in the polyurethane resin, forming bridge bonds between the polyurethane molecular chains. This links the linear polyurethane molecules together, forming a network structure. After drying, the coating forms a film that adheres to the surface of the velvet microfiber. Commonly used crosslinking agents include inorganic crosslinking agents, organosilicon crosslinking agents, benzenesulfonic acid crosslinking agents, acrylate crosslinking agents, aziridine crosslinking agents, carbodiimide crosslinking agents, and isocyanate crosslinking agents. However, for the polyurethane resin in this system, using aziridine as the crosslinking agent results in a coating layer with high density and excellent stability. The resulting product is less prone to discoloration and exhibits good color fastness.

[0046] Based on the mass fraction of the aqueous polyurethane dispersion, the coating further includes 10 to 35 parts of a second water, preferably 15 to 30 parts, and more preferably 20 to 25 parts.

[0047] This invention innovatively provides a dye system combining a colorant and a coating. The colorant is a wetting and dispersing agent with excellent water resistance, and the coating is a polyurethane and polycarbonate resin with good water resistance. At the same time, the carboxyl groups in the resin react vigorously with the aziridine crosslinking agent, increasing the crosslinking density of the paint film and giving the coating a high-fastness color fixation effect. The resulting high-fastness dye is suitable for both fixed-island and non-fixed-island microfibers, and can significantly improve color fastness. The resulting products are not easy to fade and can pass performance tests such as water fastness, acid perspiration fastness, alkaline perspiration fastness, and dry and wet rubbing fastness, meeting international standards and market demands.

[0048] The present invention also provides a method for preparing the high color fastness dye described in the above technical solution, comprising the following steps:

[0049] The dispersant, wetting agent, pigment, first defoamer and first water are mixed and ground to obtain the colorant;

[0050] A coating is obtained by mixing an aqueous polyurethane dispersion, polycarbonate resin, a second defoamer, a leveling agent, an abrasion-resistant agent, a thickener, a crosslinking agent, and a second water.

[0051] The colorant and coating are mixed to obtain the high color fastness dye.

[0052] The present invention involves mixing a dispersant, a wetting agent, a pigment, a first defoamer, and a first water, and then grinding them to obtain a colorant.

[0053] In this invention, the mixing is preferably performed by first adding the dispersant, wetting agent, and first defoamer to water in sequence, followed by a first stirring, and then adding the pigment; the stirring speed is preferably 500-1000 r / min, more preferably 600-800 r / min; the stirring time is preferably 8-10 min; the addition of pigment also preferably includes a second stirring; the stirring speed of the second stirring is preferably 1000-1500 r / min, more preferably 1200-1400 r / min; the stirring time is preferably 0.5-1 h, more preferably 0.8-1 h.

[0054] In this invention, the grinding is preferably carried out using a grinding machine; the grinding is preferably carried out 2 to 3 times; and the particle size of pigment D97 after grinding is preferably less than 5 μm, more preferably less than 3 μm.

[0055] This invention mixes an aqueous polyurethane dispersion, a polycarbonate resin, a second defoamer, a leveling agent, an abrasion-resistant agent, a thickener, a crosslinking agent, and a second water to obtain a coating.

[0056] The present invention does not impose any special limitations on the mixing process; any method known to those skilled in the art can be used to mix the mixture evenly.

[0057] In this invention, the mixing process preferably includes filtration; the mesh size of the filter is preferably 100 to 120 mesh.

[0058] After obtaining the colorant and coating, the present invention mixes the colorant and coating to obtain the high color fastness dye.

[0059] The present invention does not impose any special limitations on the mixing process; any method known to those skilled in the art can be used to mix the mixture evenly.

[0060] The preparation method provided by this invention improves color fastness by grinding the water-based colorant to a particle size D97 of less than 5μm. All raw materials used are non-toxic and harmless environmentally friendly materials. No organic solvents are used in the entire preparation process, making the production process safe and environmentally friendly. The resulting product is odorless and harmless to the human body. This method is simple, environmentally friendly, and has low production cost.

[0061] The present invention also provides the application of the high color fastness dyes described in the above technical solutions or the high color fastness dyes obtained by the preparation methods described in the above technical solutions in the dyeing of microfiber leather.

[0062] This invention also provides a method for preparing high color fastness suede microfiber leather, comprising the following steps:

[0063] High colorfastness microfiber leather is obtained by coating both sides of the suede microfiber leather with a high colorfastness dye and baking it; the high colorfastness dye is the high colorfastness dye described in the above technical solution or the high colorfastness dye obtained by the preparation method described in the above technical solution.

[0064] In this invention, the suede microfiber leather is preferably island-mounted suede microfiber leather or island-free suede microfiber leather.

[0065] In this invention, the coating is preferably roller coating; the amount of dye applied is preferably 30-40 g / m, more preferably 35-40 g / m; the number of coatings is preferably 2-3 times; the coating is preferably done using an anilox roller; the mesh number of the anilox roller is preferably 80-120 mesh, more preferably 100-120 mesh.

[0066] In this invention, the baking temperature is preferably 110-150°C, more preferably 130-150°C; the baking time is preferably 5-15 min, more preferably 10-15 min.

[0067] In this invention, the baking process preferably includes cooling.

[0068] The method for preparing high color fastness suede microfiber leather provided by the present invention involves baking the coating after dye treatment. The resulting high color fastness suede microfiber leather has excellent abrasion resistance, hydrolysis resistance, water absorption and breathability, which can meet people's daily needs.

[0069] To further illustrate the present invention, the following detailed descriptions, in conjunction with embodiments, describe the high color fastness dyes, their preparation methods and applications, and the preparation method of high color fastness suede microfiber leather provided by the present invention. However, these descriptions should not be construed as limiting the scope of protection of the present invention.

[0070] Example 1

[0071] By weight, the water-based colorant comprises 4.5 parts of acrylic modified polymer dispersant, 2 parts of fatty alcohol polyoxyethylene ether wetting agent, 30 parts of pigment (phthalocyanine blue P.B15:3, pigment red R254, furnace black P.BL.6, pigment yellow Y83), 0.2 parts of silicone defoamer, and 30 parts of water.

[0072] Water, wetting agent, dispersant, and defoamer were added sequentially to a stirred tank, and the disperser was operated at 800 rpm for 10 minutes. Pigment was added while stirring, and the pigment around the inside of the stirred tank was cleaned. The disperser was operated at 1200 rpm for 1 hour. The mixture was then ground three times in a sand mill to achieve a pigment particle size (D97) of 4 μm, yielding a water-based colorant.

[0073] By weight, the coating comprises 50 parts of waterborne polyurethane dispersion, 30 parts of waterborne polycarbonate resin, 10 parts of water, 0.5 parts of defoamer, 1.0 part of wetting and leveling agent, 1.0 part of hand feel and abrasion resistance additive, 1.0 part of medium-low shear thickener, and 4 parts of crosslinking agent. The waterborne polyurethane dispersion is WPU2682 from Guangzhou Guiling New Materials, the polycarbonate resin is PU808 from Zhongfang Chemical, and the crosslinking agent is DSM CX100 aziridine crosslinking agent.

[0074] Waterborne polyurethane dispersion, polycarbonate resin, defoamer, wetting and leveling agent, hand feel and abrasion resistance additive, medium and low shear thickener and crosslinking agent are added to water in sequence, mixed and stirred evenly, and then filtered through a filter screen to obtain the coating.

[0075] A water-based colorant and coating were mixed at a mass ratio of 9:1 to obtain a high-colorfastness dye. Using a velvet microfiber as the base fabric, the dye was applied to both sides of the base fabric using an anilox roller, with a coating amount of 40 g / m², and the application was repeated twice. The coated base fabric was then placed in an oven and baked at 110°C for 5 min, 10 min, and 15 min, respectively. After cooling, the high-colorfastness velvet microfiber was obtained.

[0076] Example 2

[0077] By weight, the water-based colorant comprises 5 parts of acrylic modified polymer dispersant, 2.5 parts of fatty alcohol polyoxyethylene ether wetting agent, 32 parts of pigment (phthalocyanine blue P.B15:3, pigment red R254, furnace black P.BL.6, pigment yellow Y83), 0.3 parts of silicone defoamer, and 40 parts of water.

[0078] Water, wetting agent, dispersant, and defoamer were added sequentially to a stirred tank, and the disperser was operated at 900 rpm for 15 minutes. Pigment was added while stirring, and the pigment inside and around the stirred tank was cleaned. The disperser was operated at 1300 rpm for 1 hour. The mixture was then ground three times in a sand mill to achieve a pigment particle size (D97) of 3 μm, yielding a water-based colorant.

[0079] By weight, the coating comprises 45 parts of waterborne polyurethane dispersion, 45 parts of waterborne polycarbonate resin, 10 parts of water, 0.6 parts of defoamer, 1.2 parts of wetting and leveling agent, 1.5 parts of hand feel and abrasion resistance additive, 1.0 part of medium-low shear thickener, and 4 parts of crosslinking agent. The waterborne polyurethane dispersion is WPU2682 from Guangzhou Guiling New Materials, the polycarbonate resin is PU808 from Zhongfang Chemical, and the crosslinking agent is DSM CX100 aziridine crosslinking agent.

[0080] Waterborne polyurethane dispersion, polycarbonate resin, defoamer, wetting and leveling agent, hand feel and abrasion resistance additive, medium and low shear thickener and crosslinking agent are added to water in sequence, mixed and stirred evenly, and then filtered through a filter screen to obtain the coating.

[0081] A water-based colorant and coating were mixed at a mass ratio of 93:7 to obtain a high-colorfastness dye. Using a velvet microfiber as the base fabric, the dye was applied to both sides of the base fabric using an anilox roller, with a coating amount of 40 g / m², and the application was repeated twice. The coated base fabric was then placed in an oven and baked at 130°C for 5 min, 10 min, and 15 min, respectively. After cooling, the high-colorfastness velvet microfiber was obtained.

[0082] Example 3

[0083] By weight, the water-based colorant comprises 7.0 parts of acrylic modified polymer dispersant, 3.5 parts of fatty alcohol polyoxyethylene ether wetting agent, 33 parts of pigment (phthalocyanine blue P.B15:3, pigment red R254, furnace black P.BL.6, pigment yellow Y83), 0.3 parts of silicone defoamer, and 50 parts of water.

[0084] Water, wetting agent, dispersant, and defoamer were added sequentially to a stirred tank, and the disperser was operated at 1000 rpm for 12 minutes. Pigment was added while stirring, and the pigment around the inside of the stirred tank was cleaned. The disperser was operated at 1500 rpm for 1 hour. The mixture was then ground three times in a sand mill to achieve a pigment particle size (D97) of 2 μm, yielding an aqueous colorant.

[0085] By weight, the coating comprises 65 parts of waterborne polyurethane dispersion, 35 parts of waterborne polycarbonate resin, 10 parts of water, 0.65 parts of defoamer, 1.0 part of wetting and leveling agent, 2.0 parts of hand feel and abrasion resistance additive, 1.5 parts of medium-low shear thickener, and 4 parts of crosslinking agent. The waterborne polyurethane dispersion is WPU2682 from Guangzhou Guiling New Materials, the polycarbonate resin is PU808 from Zhongfang Chemical, and the crosslinking agent is DSM CX100 aziridine crosslinking agent.

[0086] Waterborne polyurethane dispersion, polycarbonate resin, defoamer, wetting and leveling agent, hand feel and abrasion resistance additive, medium and low shear thickener and crosslinking agent are added to water in sequence, mixed and stirred evenly, and then filtered through a filter screen to obtain the coating.

[0087] A water-based colorant and coating were mixed at a mass ratio of 85:15 to obtain a high-colorfastness dye. Using a velvet microfiber as the base fabric, the dye was applied to both sides of the base fabric using an anilox roller, with a coating amount of 40 g / m², and the application was repeated twice. The coated base fabric was then placed in an oven and baked at 150°C for 5 min, 10 min, and 15 min, respectively. After cooling, the high-colorfastness velvet microfiber was obtained.

[0088] Test case

[0089] The high color fastness velvet microfiber obtained in Examples 1 to 3 above and commercially available ordinary island velvet microfiber were subjected to performance tests, and the results are recorded in Table 1.

[0090] Table 1. Test results of color fastness performance of high color fastness velvet microfiber and commercially available island velvet microfiber obtained in Examples 1-3.

[0091]

[0092] As can be seen from the data in Table 1, the high colorfastness velvet microfibers obtained in Examples 1-3 show significantly improved colorfastness to water stains, dry and wet rubbing, and washing compared to ordinary island velvet microfibers. Furthermore, Examples 2 and 3 demonstrate that the velvet microfibers obtained by using water-based colorants and coatings, and by varying the baking temperature and time, can all meet people's daily needs.

[0093] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. Other embodiments can be obtained based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A dye with high color fastness, characterized in that, Based on parts by weight, it includes 7 to 15 parts of colorant and 85 to 93 parts of paint; The colorant comprises 3-8 parts of dispersant, 1-5 parts of wetting agent, 28-38 parts of pigment, 0.1-0.5 parts of first defoamer, and 30-50 parts of first water; the dispersant is an acrylic acid modified polymer dispersant. The coating comprises 45-65 parts of waterborne polyurethane dispersion, 30-45 parts of polycarbonate resin, 0.5-1 part of second defoamer, 1-2 parts of leveling agent, 1-2 parts of wear-resistant additive, 0.5-2 parts of thickener, 4-5 parts of crosslinking agent, and 10-35 parts of second water; the crosslinking agent is an aziridine crosslinking agent.

2. The high color fastness dye according to claim 1, characterized in that, The wetting agent is a fatty alcohol polyoxyethylene ether wetting agent; The pigments include one or more of phthalocyanine blue, pigment red, carbon black, and pigment yellow.

3. The high color fastness dye according to claim 1, characterized in that, The first defoamer and the second defoamer are independently silicone defoamers.

4. The high color fastness dye according to claim 1, characterized in that, The elastic modulus of the aqueous polyurethane dispersion is 25–30 Pa. The elastic modulus of the polycarbonate resin is 30-35 Pa.

5. The method for preparing the high color fastness dye according to any one of claims 1 to 4, characterized in that, Includes the following steps: The dispersant, wetting agent, pigment, first defoamer and first water are mixed and ground to obtain the colorant; A coating is obtained by mixing an aqueous polyurethane dispersion, polycarbonate resin, a second defoamer, a leveling agent, an abrasion-resistant agent, a thickener, a crosslinking agent, and a second water. The colorant and coating are mixed to obtain the high color fastness dye.

6. The preparation method according to claim 5, characterized in that, The particle size of the ground pigment D97 is less than 5 μm.

7. The application of the high color fastness dye according to any one of claims 1 to 4 or the high color fastness dye obtained by the preparation method according to claim 5 or 6 in the dyeing of microfiber leather.

8. A method for preparing high colorfastness suede microfiber leather, characterized in that, Includes the following steps: High colorfastness dye is applied to both sides of suede microfiber leather and then baked to obtain high colorfastness suede microfiber leather; the high colorfastness dye is the high colorfastness dye according to any one of claims 1 to 4 or the high colorfastness dye obtained by the preparation method according to claim 5 or 6.

9. The staining method according to claim 8, characterized in that, The coating is applied by roller coating; the coating is applied 2 to 3 times.

10. The staining method according to claim 8, characterized in that, The baking temperature is 110–150°C, and the time is 5–15 minutes.

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