A dyeing slurry resistant to color migration and its preparation method and application

Abstract

The present invention belongs to the technical field of textile printing and dyeing, and specifically relates to a dyeing slurry and a preparation method and application thereof. The dyeing slurry provided by the present invention comprises the following components in percentage by mass: 30-40% acid dye, 10-20% bridging agent, 1-2% bridging accelerator, 4.8-5.2% stabilizer, 10-20% cosolvent and 23-44% water. Under the joint action of bridging agent, bridging accelerator and stabilizer, the present invention enables acid dye molecules to bidirectionally bridge with structural groups on fibers in microfiber leather, curbs the migration of dye molecules, improves the migration fastness of the dyeing slurry, and does not cause serious color migration after the dyeing slurry is used for dyeing microfiber leather. The color migration fastness of the microfiber leather in the later stage of dyeing with the dyeing slurry provided by the present invention is improved to 3.5-4.5 levels.

Description

Technical Field

[0001] The invention belongs to the technical field of textile printing and dyeing, and particularly relates to a dyeing slurry and a preparation method and application thereof. Background Art

[0002] Microfiber leather is a sea-island composite fiber structure, which is a composite fiber composed of nylon or polyester microfibers as islands and polyurethane polymers as seas. It has extremely fine pores and good air and water permeability, and is widely used in the manufacture of synthetic leather. Microfiber leather has incomparable advantages over general synthetic leather in terms of performance, especially in terms of air permeability, which is better than genuine leather. It is the key development area of ​​the current leather industry.

[0003] The color migration phenomenon after fabric dyeing is firstly related to the dye structure. The size of dye molecules, the adsorption groups on the molecular structure, the affinity of dye molecules and fabric molecular chains, etc. will affect the color migration phenomenon after dyeing. Secondly, the color migration phenomenon is related to the dyeing process. After dyeing conventional fabrics such as cotton and polyester, sufficient soap washing to remove floating color on the fabric surface can effectively slow down the dye color migration phenomenon. However, in the microfiber leather pad dyeing process, the subsequent soap washing process is omitted to meet environmental protection requirements. As a result, the color migration phenomenon of microfiber leather after dyeing is more serious, which limits its application range. Summary of the invention

[0004] In view of this, the present invention provides a dyeing slurry and a preparation method and application thereof. After dyeing microfiber leather with the dyeing slurry provided by the present invention, the microfiber leather has a higher migration fastness.

[0005] In order to solve the above technical problems, the present invention provides a dyeing slurry, comprising the following components in percentage by weight:

[0006]

[0007] Preferably, the acid dye includes acid red, acid black, acid blue, acid brown, methylene blue red F520, methylene blue black E801, methylene blue F314 or methylene blue brown F409.

[0008] Preferably, the bridging agent is a mixture of bridging agent YZ-680 and formaldehyde-free color fixing agent DS-1328.

[0009] Preferably, the mass ratio of the bridging agent YZ-680 to the formaldehyde-free color fixing agent DS-1328 is 4.8-5.2:1.

[0010] Preferably, the bridging promoter comprises ethylene glycol diformate.

[0011] Preferably, the stabilizer comprises an acrylamide copolymer or a polyvinyl alcohol polymer;

[0012] The co-solvent includes a polyol high boiling point solvent;

[0013] The polyol high boiling point solvent includes diethylene glycol or triethylene glycol.

[0014] The present invention also provides a method for preparing the dyeing slurry described in the above technical solution, comprising the following steps:

[0015] The acid dye, the bridging agent, the bridging agent accelerator, the stabilizer, the cosolvent and water are mixed to obtain the dyeing slurry.

[0016] Preferably, the mixing comprises the following steps:

[0017] first mixing water and a co-solvent to obtain a first solution;

[0018] Mixing the first solution and the acid dye to obtain a second solution;

[0019] A bridging agent, a bridging accelerator and a stabilizer are sequentially added to the second solution for a third mixing to obtain the dyeing slurry.

[0020] The present invention also provides application of the dyeing slurry described in the above technical solution in dyeing microfiber leather.

[0021] Preferably, the method for dyeing microfiber leather using the dyeing slurry comprises the following steps:

[0022] The dyeing slurry is mixed and diluted with water to obtain a color slurry working solution;

[0023] The color paste working solution and the penetrant are mixed, and the microfiber leather is subjected to two dipping and two rolling and then dried to obtain the dyed microfiber leather.

[0024] The present invention provides a dyeing slurry comprising the following components in percentage by weight: 30-40% acid dye, 10-20% bridging agent, 1-2% bridging accelerator, 4.8-5.2% stabilizer, 10-20% cosolvent and 23-44% water. Under the joint action of the bridging agent, the bridging accelerator and the stabilizer, the present invention enables the acid dye molecules to perform a bidirectional bridging action with the structural groups on the fibers in the microfiber leather, curbs the phenomenon of dye molecule migration, improves the migration fastness of the dyeing slurry, and does not cause serious color migration after the dyeing slurry is used for dyeing the microfiber leather. The color migration fastness of the microfiber leather in the later stage of dyeing with the dyeing slurry provided by the present invention is improved to 3.5-4.5 levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a physical picture of the color migration performance test of Example 1;

[0026] Figure 2This is a physical picture of the color migration performance test of Comparative Example 1;

[0027] Figure 3 This is a physical picture of the color migration performance test of Example 2;

[0028] Figure 4 This is a physical picture of the color migration performance test of Comparative Example 2;

[0029] Figure 5 This is a physical picture of the color migration performance test of Example 3;

[0030] Figure 6 This is a physical picture of the color migration performance test of Comparative Example 3;

[0031] Figure 7 This is a physical picture of the color migration performance test of Example 4;

[0032] Figure 8 This is a physical picture of the color migration performance test of Comparative Example 4. DETAILED DESCRIPTION

[0033] The present invention provides a dyeing slurry, comprising the following components in percentage by weight:

[0034]

[0035] In terms of mass percentage, the dyeing slurry provided by the present invention includes 30-40% acid dyes, which can be 30-35%, and can be specifically 30%, 33%, 35%, 38% or 40%. As a specific embodiment of the present invention, the acid dyes can include acid red, acid black, acid blue, acid brown, methylene blue red F520, methylene blue black E801, methylene blue blue F314 or methylene blue brown F409. In the present invention, in addition to the sulfonic acid group in the molecular structure of the acid dyes being easily adsorbed with the imine charge in the island part (such as nylon) of the micro-fiber sea-island fiber, other groups such as anthraquinone or azo groups such as amino, hydroxyl, etc. are bonded to the reactive groups on the bridge, so that the dye is locked on the fiber and the mobility is slowed down.

[0036] In terms of mass percentage, the dyeing slurry provided by the present invention includes 10-20% bridging agent, which can be 10-15%, and can be specifically 10%, 15% or 20%. As a specific embodiment of the present invention, the bridging agent can be a mixture of bridging agent YZ-680 and aldehyde-free color fixing agent DS-1328; the mass ratio of the bridging agent YZ-680 and the aldehyde-free color fixing agent DS-1328 can be 4.8-5.2:1, and can be specifically 5:1. As a specific embodiment of the present invention, the bridging agent YZ-680 is purchased from Suzhou Shuixiu New Materials Co., Ltd., and the aldehyde-free color fixing agent DS-1328 is purchased from Jiangxi Desheng Fine Chemicals Co., Ltd. In the present invention, the bridging agent is compounded by YZ-680 and aldehyde-free color fixing agent DS-1328, and the compound contains both cyanamide and epoxy groups. The molecular structure of the bridging agent is similar to the polyurethane structure in the sea component of the microfiber sea-island fiber. The bridging agent has a high affinity with the microfiber leather and is easily adsorbed on the fiber. After the epoxy group with the reactive epoxy group is opened, the formed hydroxyl group and the imine group on the nylon can easily form a cross-linking reaction, thereby increasing the bond strength.

[0037] In terms of mass percentage, the dyeing slurry provided by the present invention includes 1-2% bridging accelerator, which can be specifically 1%, 1.5% or 2%. As a specific embodiment of the present invention, the bridging accelerator can include ethylene glycol diformate. In the present invention, the bridging accelerator has an acid-releasing property, which releases acidic substances when a certain temperature condition is reached, reduces the pH value of the dyeing slurry to promote the cross-linking reaction, and improves the bonding strength between the acid dye and the microfiber leather. The cyanamide group on the bridging agent combines with the sulfonic acid group in the acid dye molecule to produce opposite charges, and the hydroxyl group on the bridging agent produces a cross-linking reaction with the amino group or ester group on the fiber in the microfiber leather, so that the acid dye and the microfiber leather are fixed on the fiber under the action of the bridging agent, thereby improving the migration fastness.

[0038] In terms of mass percentage, the dyeing slurry provided by the present invention includes 4.8-5.2% stabilizer, which may be 5%. As a specific embodiment of the present invention, the stabilizer may include acrylamide copolymer or polyvinyl alcohol polymer; the acrylamide copolymer may be polyacrylamide; the polyvinyl alcohol polymer may be polyvinyl alcohol, and the polyvinyl alcohol may be polyvinyl alcohol 1788. As a specific embodiment of the present invention, the polyvinyl alcohol may be added in the form of polyvinyl alcohol aqueous solution; the mass concentration of the polyvinyl alcohol aqueous solution may be 13-17%, and may be specifically 15%. In the present invention, the stabilizer is a high molecular polymer that forms a film on the fiber, which improves the stability of the combination of the bridging agent and the acid dye, and its deposited film also covers the acid dye molecules, reducing dye migration, thereby improving color migration fastness.

[0039] In terms of mass percentage, the dyeing paste provided by the present invention includes 10-20% of a cosolvent, which may be 15-20%, and may be specifically 10%, 13%, 15%, 18% or 20%. As a specific embodiment of the present invention, the cosolvent may include a polyol high boiling point solvent; the polyol high boiling point solvent may include diethylene glycol or triethylene glycol.

[0040] In terms of mass percentage, the dyeing paste provided by the present invention comprises 23-44% water, which may be 29-34%. As a specific embodiment of the present invention, the water may be soft water or distilled water.

[0041] As a specific embodiment of the present invention, the pH value of the dyeing slurry may be 5-6.

[0042] In the present invention, the acid dye has an R-SO3Na structure, wherein -SO3Na is a strong hydrophilic group with excellent water solubility. It can be seen that the dye molecules on the microfiber leather after dyeing with the acid dye have an obvious tendency to migrate into the aqueous solution; the island part of the microfiber leather molecular structure is nylon fiber with NH2 group, and the sea component is a polyurethane structure with Group. Under the joint action of a specific bridging agent, a bridging accelerator and a stabilizer, the present invention enables the acid dye molecules to bidirectionally bridge with the structural groups on the fibers in the microfiber leather, thereby curbing the migration of dye molecules and improving the migration fastness of the dyeing slurry. When the dyeing slurry is used for dyeing microfiber leather, no serious color migration will occur. The color migration fastness of the microfiber leather in the later stage of dyeing with the dyeing slurry provided by the present invention is improved to 3.5 to 4.5 levels.

[0043] The present invention also provides a method for preparing the dyeing slurry described in the above technical solution, comprising the following steps:

[0044] The acid dye, the bridging agent, the bridging agent accelerator, the stabilizer, the cosolvent and water are mixed to obtain the dyeing slurry.

[0045] As a specific embodiment of the present invention, the mixing may include the following steps:

[0046] first mixing water and a co-solvent to obtain a first solution;

[0047] Mixing the first solution and the acid dye to obtain a second solution;

[0048] A bridging agent, a bridging accelerator and a stabilizer are sequentially added to the second solution for a third mixing to obtain the dyeing slurry.

[0049] The present invention first mixes water and a co-solvent to obtain a first solution. As a specific embodiment of the present invention, the first mixing can be performed under stirring, and the stirring speed can be 200 to 300 r / min, and can be specifically 200 r / min, 250 r / min or 300 r / minn. The present invention has no particular limitation on the temperature and time of the stirring, as long as the mixture can be mixed evenly.

[0050] After obtaining the first solution, the present invention secondly mixes the first solution and the acid dye to obtain a second solution. As a specific embodiment of the present invention, the second mixing can be carried out under stirring, and the stirring speed can be 200-800r / min, and can be specifically 200r / min, 250r / min, 300r / min, 350r / min, 400r / min, 450r / min, 500r / min, 550r / min, 600r / min, 650r / min, 700r / min, 750r / min or 800r / min; the stirring temperature can be 20-80°C, and can be specifically 20°C, 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C or 80°C; the stirring time can be 1-3h, and can be specifically 1h, 1.5h, 2h, 2.5h or 3h. As a specific embodiment of the present invention, the acid dye may be added to the first solution in batches, and the batches may be 2 to 4 times, and may be specifically 2 times, 3 times or 4 times.

[0051] After obtaining the second solution, the present invention sequentially adds a bridging agent, a bridging accelerator and a stabilizer to the second solution for a third mixing to obtain the dyeing slurry. As a specific embodiment of the present invention, the third mixing can be carried out under stirring conditions, and the stirring speed can be 200-800r / min, specifically 200r / min, 250r / min, 300r / min, 350r / min, 400r / min, 450r / min, 500r / min, 550r / min, 600r / min, 650r / min, 700r / min, 750r / min or 800r / min; the stirring temperature can be 20-80℃, specifically 20℃, 25℃, 30℃, 35℃, 40℃, 45℃, 50℃, 55℃, 60℃, 65℃, 70℃, 75℃ or 80℃; the stirring time can be 1-2h, specifically 1h, 1.5h or 2h.

[0052] The present invention also provides an application of the dyeing slurry described in the above technical solution in dyeing microfiber leather. As a specific embodiment of the present invention, a method for dyeing microfiber leather using the dyeing slurry comprises the following steps:

[0053] The dyeing slurry is mixed and diluted with water to obtain a color slurry working solution;

[0054] The color paste working solution and the penetrant are mixed, and the microfiber leather is subjected to two dipping and two rolling and then dried to obtain the dyed microfiber leather.

[0055] The present invention mixes and dilutes the dyeing slurry and water to obtain a color paste working solution. As a specific embodiment of the present invention, the water can be industrial water; the mass of the dyeing slurry and the volume ratio of water can be 20 to 50 g:1L, and can be specifically 20g:1L, 25g:1L, 30g:1L, 35g:1L, 40g:1L, 45g:1L or 50g:1L. The present invention has no special limitation on the mixing and dilution method, as long as it can be mixed evenly.

[0056] After obtaining the color paste working solution, the present invention mixes the color paste working solution and the penetrant, and then performs two dips and two rolls on the microfiber leather and then dries to obtain the dyed microfiber leather. As a specific embodiment of the present invention, the penetrant can be fatty alcohol polyoxyethylene ether (JFC); the mass concentration of the penetrant in the system after the color paste working solution and the penetrant are mixed can be 4-6g / L, and can be specifically 4g / L, 5g / L or 6g / L. As a specific embodiment of the present invention, the rolling rate of the two dips and two rolls can be 50-70%, and can also be 55-65%. As a specific embodiment of the present invention, the drying can include pre-drying and baking performed in sequence; the pre-drying temperature can be 100-110°C, and can be specifically 100°C, 105°C or 110°C; the pre-drying time can be 5-10min, and can be specifically 5min, 8min or 10min. As a specific embodiment of the present invention, the baking temperature can be 140-160°C, specifically 140°C, 145°C, 150°C, 155°C or 160°C; the baking time can be 1-3 minutes, specifically 1 minute, 1.5 minutes, 2 minutes, 2.5 minutes or 3 minutes; the present invention can select the pre-drying and baking temperature and time according to the thickness of the fabric. As a specific embodiment of the present invention, thin fabrics (e.g. 215g / m 2 ) Select 105℃ pre-drying for 8 minutes, thick fabric (for example 693g / m 2) Pre-bake at 110°C for 10 minutes. As a specific embodiment of the present invention, the drying may further include: cooling the dried material to room temperature; the room temperature may be 20-35°C, or 25-30°C. The present invention has no special limitation on the cooling method, and conventional methods in the art may be used.

[0057] The dyeing paste provided by the invention is convenient to prepare and simple to apply, and does not require complicated pre-treatment and post-finishing processes. For microfiber leather dyeing factories, it reduces pollution, simplifies processes, saves production costs, and has a very obvious effect.

[0058] The color migration fastness of the microfiber leather after dyeing by using the dyeing color paste provided by the present invention is improved to level 3.5-4.5, which meets the national testing standards.

[0059] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0060] Example 1

[0061] The distilled water and diethylene glycol (cosolvent) were stirred uniformly at a speed of 200 r / min to obtain a first solution;

[0062] Acid scarlet (acid dye) was added to the first solution in three batches and stirred at a speed of 200 r / min and a temperature of 40° C. for 2 h to obtain a second solution;

[0063] To the second solution, a mixture of bridging agent YZ-680 and formaldehyde-free color fixing agent DS-1328 in a mass ratio of 5:1 (bridging agent), ethylene glycol diformate (bridging promoter) and a polyvinyl alcohol 1788 aqueous solution with a mass concentration of 15% (stabilizer) were added in sequence, and the mixture was stirred for 1 hour at a speed of 500 r / min and a temperature of 60°C to obtain a dyeing slurry with a pH value of about 5; the mass percentage of each component in the dyeing slurry is: 30% acid scarlet, 15% bridging agent (a mixture of bridging agent YZ-680 and formaldehyde-free color fixing agent DS-1328), 5% polyvinyl alcohol, 1% ethylene glycol diformate, 15% diethylene glycol and 34% distilled water.

[0064] Example 2

[0065] The distilled water and diethylene glycol (cosolvent) were stirred uniformly at a speed of 200 r / min to obtain a first solution;

[0066] Acid black (acid dye) was added to the first solution in three batches, and the mixture was stirred at a speed of 200 r / min and a temperature of 40° C. for 2 h to obtain a second solution;

[0067] To the second solution, a mixture of bridging agent YZ-680 and formaldehyde-free color fixing agent DS-1328 in a mass ratio of 5:1 (bridging agent), ethylene glycol diformate (bridging promoter) and a polyvinyl alcohol 1788 aqueous solution with a mass concentration of 15% (stabilizer) were added in sequence, and the mixture was stirred for 1 hour at a speed of 500 r / min and a temperature of 60°C to obtain a dyeing slurry with a pH value of about 5; the mass percentage of each component in the dyeing slurry is: 30% acid black, 10% bridging agent (a mixture of bridging agent YZ-680 and formaldehyde-free color fixing agent DS-1328), 5% polyvinyl alcohol, 1% ethylene glycol diformate, 20% diethylene glycol and 34% distilled water.

[0068] Example 3

[0069] The distilled water and diethylene glycol (cosolvent) were stirred uniformly at a speed of 200 r / min to obtain a first solution;

[0070] Acid blue (acid dye) was added to the first solution in three batches, and the mixture was stirred at a speed of 200 r / min and a temperature of 40° C. for 2 h to obtain a second solution;

[0071] To the second solution, a mixture of bridging agent YZ-680 and formaldehyde-free color fixing agent DS-1328 in a mass ratio of 5:1 (bridging agent), ethylene glycol diformate (bridging promoter) and a polyvinyl alcohol 1788 aqueous solution with a mass concentration of 15% (stabilizer) were added in sequence, and the mixture was stirred for 1 hour at a speed of 500 r / min and a temperature of 60°C to obtain a dyeing slurry with a pH value of about 5; the mass percentage of each component in the dyeing slurry is: 30% acid blue, 10% bridging agent (a mixture of bridging agent YZ-680 and formaldehyde-free color fixing agent DS-1328), 5% polyvinyl alcohol, 1% ethylene glycol diformate, 20% diethylene glycol and 34% distilled water.

[0072] Example 4

[0073] The distilled water and diethylene glycol (cosolvent) were stirred uniformly at a speed of 200 r / min to obtain a first solution;

[0074] Acid brown (acid dye) was added to the first solution in three batches, and the mixture was stirred at a speed of 200 r / min and a temperature of 40° C. for 2 h to obtain a second solution;

[0075] To the second solution, a mixture of bridging agent YZ-680 and formaldehyde-free color fixing agent DS-1328 in a mass ratio of 5:1 (bridging agent), ethylene glycol diformate (bridging promoter) and a polyvinyl alcohol 1788 aqueous solution with a mass concentration of 15% (stabilizer) were added in sequence, and the mixture was stirred for 1 hour at a speed of 500 r / min and a temperature of 60°C to obtain a dyeing slurry with a pH value of about 5; the mass percentage of each component in the dyeing slurry is: 30% acid brown, 20% bridging agent (a mixture of bridging agent YZ-680 and formaldehyde-free color fixing agent DS-1328), 5% polyvinyl alcohol, 1% ethylene glycol diformate, 15% diethylene glycol and 29% distilled water.

[0076] Comparative Example 1

[0077] The distilled water and diethylene glycol (cosolvent) were stirred uniformly at a speed of 200 r / min to obtain a first solution;

[0078] Acid scarlet (acid dye) was added to the first solution in three batches and stirred at a speed of 200 r / min and a temperature of 40° C. for 2 hours to obtain a dyeing slurry; the mass percentage of each component in the dyeing slurry was: 30% acid scarlet, 15% diethylene glycol and 55% distilled water.

[0079] Comparative Example 2

[0080] The distilled water and diethylene glycol (cosolvent) were stirred uniformly at a speed of 200 r / min to obtain a first solution;

[0081] Acid black (acid dye) was added to the first solution in three batches and stirred at a speed of 200 r / min and a temperature of 40° C. for 2 hours to obtain a dyeing slurry; the mass percentage of each component in the dyeing slurry was: 30% acid black, 20% diethylene glycol and 50% distilled water.

[0082] Comparative Example 3

[0083] The distilled water and diethylene glycol (cosolvent) were stirred uniformly at a speed of 200 r / min to obtain a first solution;

[0084] Acid blue (acid dye) was added to the first solution in three batches and stirred at a speed of 200 r / min and a temperature of 40° C. for 2 h to obtain a dyeing slurry; the mass percentage of each component in the dyeing slurry was: 30% acid blue, 20% diethylene glycol and 50% distilled water.

[0085] Comparative Example 4

[0086] The distilled water and diethylene glycol (cosolvent) were stirred uniformly at a speed of 200 r / min to obtain a first solution;

[0087] Acid brown (acid dye) was added to the first solution in three batches and stirred at a speed of 200 r / min and a temperature of 40°C for 2 hours to obtain a dyeing slurry; the mass percentage of each component in the dyeing slurry was: 30% acid brown, 15% diethylene glycol and 55% distilled water.

[0088] The microfiber leather was dyed using the dyeing slurry prepared in Examples 1 to 4 and Comparative Examples 1 to 4 according to the following method:

[0089] 50 g of dyeing slurry and 1 L of industrial water were mixed and diluted to obtain a color slurry working solution;

[0090] After mixing the color paste working solution and 5g of fatty alcohol polyoxyethylene ether (JFC penetrant), the microfiber leather was double-dipped and double-rolled (the rolling liquid rate was 70%), and then pre-baked at 105°C for 8min. The pre-baked material was baked at 150°C for 2min and cooled to 30°C to obtain the dyed microfiber leather.

[0091] According to GB / T 36971-2018 "Textiles - Tests for Color Fastness - Assessment of the Migration of Fabric Dyes into Polyvinyl Chloride Coatings", the color migration performance of the microfiber leather dyed with the dyeing slurries of Examples 1 to 4 and Comparative Examples 1 to 4 was tested, and the results are listed in Table 1; the test conditions are: color migration equipment: 20 cm long, 10 cm wide, 5 kg weight; color migration process: 50°C, 16 h; sample size: 5 cm×1 cm.

[0092] Table 1 Color migration properties of microfiber leather dyed with dyeing slurry of Examples and Comparative Examples

[0093] Example Migration fastness Example 1 3.5 Comparative Example 1 2.0 Example 2 4.0 Comparative Example 2 2.0 Example 3 4.5 Comparative Example 3 3.5 Example 4 4 Comparative Example 4 2.5

[0094] Figures 1 to 8 The actual pictures after the color migration performance test of Examples 1 to 4 and Comparative Examples 1 to 4 are shown in FIG. Figure 1 This is a physical picture of the color migration performance test of Example 1. Figure 2 This is a physical picture of the color migration performance test of Comparative Example 1. Figure 3 This is a physical picture of the color migration performance test of Example 2. Figure 4 This is a physical picture of the color migration performance test of Comparative Example 2. Figure 5 This is a physical picture of the color migration performance test of Example 3. Figure 6 This is a physical picture of the color migration performance test of Comparative Example 3. Figure 7 This is a physical picture of the color migration performance test of Example 4. Figure 8 This is a physical picture of the color migration performance test of Comparative Example 4.

[0095] Combining Table 1 and Figures 1 to 8It can be seen that the dyeing paste provided by the present invention can significantly improve the color migration fastness of microfiber leather dyeing, meeting the requirements of the national standard GB / T 36971-2018, and can effectively simplify the process for dyeing factories, reduce wastewater discharge, and reduce production costs. It is in line with the industrial development concept of energy conservation and emission reduction, and is beneficial to the development of a green ecological environment.

[0096] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A dyeing slurry, characterized in that: Includes the following components in percentage by mass:

2. The dyeing slurry according to claim 1, characterized in that: The acid dyes include acid red, acid black, acid blue, acid brown, methylene blue red F520, methylene blue black E801, methylene blue F314 or methylene blue brown F409.

3. The dyeing slurry according to claim 1, characterized in that: The bridging agent is a mixture of a bridging agent YZ-680 and an aldehyde-free color fixing agent DS-1328.

4. The dyeing slurry according to claim 3, characterized in that: The mass ratio of the bridging agent YZ-680 to the formaldehyde-free color fixing agent DS-1328 is 4.8-5.2:

1.

5. The dyeing slurry according to claim 1, characterized in that: The bridging promoter includes ethylene glycol diformate.

6. The dyeing slurry according to claim 1, characterized in that: The stabilizer includes acrylamide copolymer or polyvinyl alcohol polymer; The co-solvent includes a polyol high boiling point solvent; The polyol high boiling point solvent includes diethylene glycol or triethylene glycol.

7. The method for preparing the dyeing paste according to any one of claims 1 to 6, characterized in that: The following steps are involved: The acid dye, the bridging agent, the bridging agent accelerator, the stabilizer, the cosolvent and water are mixed to obtain the dyeing slurry.

8. The preparation method according to claim 7, characterized in that: The mixing comprises the following steps: first mixing water and a co-solvent to obtain a first solution; Mixing the first solution and the acid dye to obtain a second solution; A bridging agent, a bridging accelerator and a stabilizer are sequentially added to the second solution for a third mixing to obtain the dyeing slurry.

9. Use of the dyeing slurry according to any one of claims 1 to 6 in dyeing microfiber leather.

10. The use according to claim 9, characterized in that: The method for dyeing microfiber leather using the dyeing slurry comprises the following steps: The dyeing slurry is mixed and diluted with water to obtain a color slurry working solution; The color paste working solution and the penetrant are mixed, and the microfiber leather is subjected to two dipping and two rolling and then dried to obtain the dyed microfiber leather.

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