Suede leather finishing agent, finishing process and leather

Abstract

The present application relates to the technical field of leather processing, specifically disclosing a leather suede finishing agent, a finishing process, and leather. The leather suede finishing agent is primarily made from the following raw materials: a water-based acrylic prepolymer emulsion, fatty alcohol polyoxyethylene ether, isopropyl alcohol, dipropylene glycol methyl ether, and anionic dye water; the water-based acrylic prepolymer emulsion is primarily made from the following raw materials: butyl acrylate, styrene, 5-hexanenitrile, dimethylpropylsulfonamide ethyl methacrylate, methacrylic acid, an initiator, p-toluenesulfonic acid, 8-hydroxy-2-octanone, succinic acid dihydrazide, an emulsifier, a feel agent, and water. This leather suede finishing agent not only reduces the amount of dye water used but also improves the leather's color fastness to friction, water, and aging. It also makes the leather suede surface more uniform, feels fuller, has high color fastness, and produces bright and natural colors.

Description

Technical Field

[0001] The present application relates to the technical field of fur leather processing, and more specifically, to a fur leather suede finishing agent, a finishing process and fur leather. Background Art

[0002] Fur leather refers to a leather product with a fleece side on one side and a velvet side on the other. It is obtained by chemically and mechanically treating animal hides, then subjecting the flesh side to a leather-like surface finish. During the fur leather processing process, the leather skin is first soaked, re-immersed in water, sheared, fleshed, defatted, pickled, white tanned, filled, finished, retanned and dyed, and finally dried to obtain a fur leather blank. The fur leather blank has one fleece side and one velvet side. The fur leather blank is then coated using a spray gun to apply a fur leather finishing agent to the velvet side of the leather blank to enhance the quality and color of the leather, making it durable and naturally beautiful.

[0003] Existing leather finishing agents typically contain ethylene glycol monoethyl ether, isopropyl ketone, and dye solution, with the dye solution comprising approximately 10% by weight of the total leather finishing agent. When spraying the suede surface of a leather base with these leather finishing agents, large amounts of dye solution are used, with the amount applied sometimes reaching 3.5g per square foot. This high cost of dye solution inevitably increases the cost of dye solution, and the high amount of dye solution in the discharged wastewater also increases wastewater treatment costs. Summary of the Invention

[0004] In order to reduce the usage and waste of dye water, and reduce the cost of dye water use and sewage treatment costs, the present application provides a suede leather finishing agent, a finishing process and leather.

[0005] In a first aspect, the present application provides a suede finishing agent for leather, which adopts the following technical solution:

[0006] The suede leather finishing agent is mainly prepared from the following raw materials in parts by weight: 800-1500 parts of water-based acrylic prepolymer emulsion, 100-200 parts of fatty alcohol polyoxyethylene ether, 100-200 parts of isopropyl alcohol, 200-300 parts of dipropylene glycol methyl ether, and 10-30 parts of anionic dye water;

[0007] The aqueous acrylic prepolymer emulsion is mainly prepared from the following raw materials in parts by weight: 20-40 parts of butyl acrylate, 16-24 parts of styrene, 8-12 parts of 5-hexanenitrile, 6-10 parts of dimethylpropylsulfonamidoethyl methacrylate, 8-12 parts of methacrylic acid, 0.2-0.5 parts of initiator, 0.2-0.5 parts of p-toluenesulfonic acid, 14-18 parts of 8-hydroxy-2-octanone, 10-14 parts of succinic acid dihydrazide, 0.5-1 parts of emulsifier, 0.2-1 parts of feel agent, and 888.1-895.8 parts of water.

[0008] A conventional leather finishing agent is applied to the suede surface of a leather base. The spraying amount of the leather suede finishing agent is 40 g / square foot, i.e., the total amount of dye water sprayed is 3.6364 g / square foot. The resulting leather has a dry rubbing color fastness of 2.5, a wet rubbing color fastness of 2.0, a water color fastness of 3.0, and an aging color fastness of 1.5.

[0009] The fur leather suede finishing agent of the present application is applied to the suede surface of a fur leather blank, with a spraying amount of 6-10 g / square foot, i.e., a total amount of dye water sprayed is 0.0678-0.1130 g / square foot. This greatly reduces the amount of dye water used, reduces dye water waste and usage costs, and thus reduces the cost of sewage treatment. Furthermore, the obtained fur leather has a dry friction color fastness of ≥3.5, a wet friction color fastness of ≥3, a water color fastness of ≥4.0, and an aging color fastness of ≥4.0, resulting in the fur leather exhibiting the advantages of high color fastness to friction, high color fastness to water, and high color fastness to aging.

[0010] The fur leather suede finishing agent of the present application, through the mutual coordination of various raw materials, not only reduces the use of dye water and improves the use effect of the fur leather suede finishing agent, but also makes the suede of the fur leather more uniform, fuller in hand, with high color fastness and bright and natural color.

[0011] In the water-based acrylic prepolymer emulsion, butyl acrylate, styrene, 5-hexanenitrile, dimethylpropylsulfonamide ethyl methacrylate, and methacrylic acid all contain carbon-carbon double bonds, which can undergo polymerization reactions to form polymers. The introduction of carboxyl groups, ester groups, phenyl groups, nitrile groups, quaternary ammonium groups, and sulfonate groups into the polymer not only increases reactive groups but also effectively regulates the functional groups of the polymer, increasing the reactivity of surface groups. The addition of 8-hydroxy-2-octanone to the raw materials can undergo a grafting reaction with the carboxyl groups in the polymer and introduce ketocarbonyl groups into the polymer. The addition of succinic acid dihydrazide to the raw materials not only increases the permeability of the leather suede finish but also, as the solvent evaporates from the system, cross-links the ketocarbonyl groups in adjacent polymers with the hydrazide groups in succinic acid dihydrazide, significantly enhancing the durability and aging resistance of the water-based acrylic prepolymer emulsion.

[0012] Anionic dye water is added to the raw materials of the leather suede finishing agent. This anionic dye interacts with the suede surface of the leather, improving coating adhesion, color vividness, and color fastness. Simultaneously, as the solvent evaporates from the system, the quaternary ammonium groups in the adjacent polymer compounds interact with the anionic groups in the anionic dye, further enhancing the coating's color fastness to rubbing, water, and aging.

[0013] Optionally, the fatty alcohol polyoxyethylene ether is one or more of fatty alcohol polyoxyethylene ether AEO-3, fatty alcohol polyoxyethylene ether AEO-5, and fatty alcohol polyoxyethylene ether AEO-10.

[0014] By adopting the above technical solution, not only is the selection of fatty alcohol polyoxyethylene ethers facilitated, but fatty alcohol polyoxyethylene ether AEO-3, fatty alcohol polyoxyethylene ether AEO-5, and fatty alcohol polyoxyethylene ether AEO-10 ​​also contain more ethoxy groups, exhibiting excellent surface activity, and being able to form a more stable emulsification effect between water and oil, thereby increasing the storage stability of the suede finishing agent for leather.

[0015] Optionally, the fur leather suede finishing agent is prepared by the following method: mixing water-based acrylic prepolymer emulsion, fatty alcohol polyoxyethylene ether, isopropyl alcohol, and dipropylene glycol methyl ether, and then adding anionic dye water and mixing to obtain the fur leather suede finishing agent.

[0016] By adopting the above technical solution, water-based acrylic prepolymer emulsion, fatty alcohol polyoxyethylene ether, isopropyl alcohol and dipropylene glycol methyl ether are mixed in advance, and then anionic dye water is added to increase the uniformity of the raw material mixing and improve the stability of the leather suede finishing agent.

[0017] Optionally, the aqueous acrylic prepolymer emulsion is prepared by the following method: dividing water into three parts, namely a first part of water, a second part of water, and a third part of water;

[0018] S1. Mix the initiator and the first portion of water to obtain a premixed solution;

[0019] S2. Mix butyl acrylate, styrene, 5-hexanenitrile, dimethylpropylsulfonamide ethyl methacrylate, methacrylic acid, and an emulsifier, then add a second portion of water and mix, then heat to 75-85° C., dropwise add the premixed solution, and after the addition is complete, stir for 1-3 hours, then add p-toluenesulfonic acid and mix, add 8-hydroxy-2-octanone, stir for 8-12 hours, cool, then add succinic acid dihydrazide, a feel agent, and a third portion of water and mix to obtain a water-based acrylic prepolymer emulsion.

[0020] Optionally, the first portion of water accounts for 5-15 wt% of the total water; the second portion of water accounts for 50-70 wt% of the total water; and the third portion of water accounts for 25-35 wt% of the total water.

[0021] By adopting the above technical solution, butyl acrylate, styrene, 5-hexanenitrile, dimethylpropylsulfonamide ethyl methacrylate, and methacrylic acid are first mixed, and then an initiator is added. The initiator releases active free radicals and promotes polymerization of the monomers to form a polymer compound, and carboxyl groups are introduced into the polymer compound. Then, p-toluenesulfonic acid and 8-hydroxy-2-octanone are added. The p-toluenesulfonic acid catalyzes a grafting reaction between the carboxyl groups in the polymer compound and the hydroxyl groups in the 8-hydroxy-2-octanone, and introduces ketocarbonyl groups into the polymer compound. Then, succinic acid dihydrazide is added to obtain a water-based acrylic prepolymer emulsion.

[0022] The initiator is prepared into a solution in advance to facilitate subsequent dropwise addition, which not only achieves the purpose of uniform mixing and reduces waste, but also controls the amount of initiator added, thereby controlling the reaction rate, increasing the stability of the reaction, improving the stability of the preparation of the water-based acrylic prepolymer emulsion, and maintaining the good performance and use effect of the water-based acrylic prepolymer emulsion.

[0023] In various embodiments, the first portion of water accounts for 10 wt% of the total water; the second portion of water accounts for 60 wt% of the total water; and the third portion of water accounts for 30 wt% of the total water. Alternatively, as needed, the first portion of water accounts for 5 wt% of the total water; the second portion of water accounts for 70 wt% of the total water; and the third portion of water accounts for 25 wt% of the total water. Alternatively, as needed, the first portion of water accounts for 15 wt% of the total water; the second portion of water accounts for 50 wt% of the total water; and the third portion of water accounts for 35 wt% of the total water.

[0024] Optionally, the premix solution is added dropwise for 2-3 hours.

[0025] By adopting the above technical solution, the dropwise addition time is optimized, which facilitates the control of the added amount of the initiator and the reaction rate, thereby facilitating the polymerization reaction.

[0026] In various embodiments, the addition time of the premix solution is 2.5 hours. The addition time of the premix solution can also be set to 2 hours, 2.2 hours, 2.8 hours, 3 hours, etc. as needed.

[0027] Optionally, the initiator is one or more of ammonium persulfate, sodium persulfate, and potassium persulfate.

[0028] By adopting the above technical solution, not only is the selection of the initiator convenient, but it also has higher initiation efficiency, as well as higher heat resistance and oxidation resistance. At the same time, ammonium persulfate, sodium persulfate, and potassium persulfate have higher solubility in water, forming a stable initiation system and reaction environment, thereby improving the stability of the preparation of the water-based acrylic prepolymer emulsion.

[0029] Optionally, the emulsifier is one or more of Tween 80, Tween 60, Tween 40, Span 80, Span 60, and Span 40.

[0030] By adopting the above technical solution, not only is the selection of emulsifiers convenient, but Tween emulsifiers and Span emulsifiers also have high emulsifying ability, effectively reducing the interfacial tension between water and oil. At the same time, they also have good penetration and solubilization effects, promoting the dispersion and dissolution of oil in water, and improving the storage stability of water-based acrylic prepolymer emulsions.

[0031] In a second aspect, the present application provides a finishing process for the suede leather finishing agent as described above, which adopts the following technical solution:

[0032] The finishing process of the suede leather finishing agent as described above comprises the following steps:

[0033] T1. Prepare water and a leather suede finishing agent in a weight ratio of (10-30):1, and then mix the water and the leather suede finishing agent to obtain a diluent;

[0034] T2. Spray the diluted solution on the suede surface of the leather embryo, repeatedly spray at least 2 times, the total amount of the leather suede finishing agent sprayed is 6-10g / square foot, dry and solidify, and complete the finishing process.

[0035] By adopting the above-mentioned technical solution, compared with directly spraying the leather suede finishing agent on the suede surface of the leather blank, in the present application, water is used to dilute the leather suede finishing agent, which greatly increases the amount of the diluent, and through multiple spraying, the leather suede finishing agent can be evenly sprayed on the suede surface of the leather blank, that is, the spraying uniformity of the leather suede finishing agent is improved, making the suede surface of the leather more uniform, fuller in hand and natural in appearance.

[0036] In various embodiments, the weight ratio of water to the leather suede finishing agent is 20:1, and the weight ratio can also be set to 10:1, 15:1, 25:1, 30:1, etc. as needed.

[0037] In multiple embodiments, the total amount of the leather suede finishing agent sprayed is 8 g / square foot, and the total amount of the sprayed can also be set to 6 g / square foot, 6.5 g / square foot, 7 g / square foot, 7.5 g / square foot, etc., 8.5 g / square foot, 9 g / square foot, 9.5 g / square foot, 10 g / square foot, etc. as needed.

[0038] In a third aspect, the present application provides a wool leather, which adopts the following technical solution:

[0039] The wool leather is obtained by using the above-mentioned wool leather suede finishing agent to coat the leather.

[0040] In summary, this application has at least the following beneficial effects:

[0041] 1. The fur leather suede finishing agent of the present application is prepared by adding a water-based acrylic prepolymer emulsion to the raw materials, coordinating the interaction between anionic dye and water, and utilizing the high molecular compound in the water-based acrylic prepolymer emulsion. When the spraying amount of the fur leather suede finishing agent is 6-10 g / square foot, that is, when the total amount of dye water sprayed is 0.0678-0.1130 g / square foot, the color fastness to dry friction ≥3.5, the color fastness to wet friction ≥3, the color fastness to water ≥4.0, and the color fastness to aging ≥4.0 can be achieved, so that the fur leather exhibits the advantages of high color fastness to friction, high color fastness to water, and high color fastness to aging.

[0042] 2. The fur leather suede finishing agent of the present application, through the interaction of various raw materials, not only reduces the use of dye water and improves the use effect of the fur leather suede finishing agent, but also makes the suede surface of the fur leather more uniform, fuller in hand, with high color fastness and bright and natural color. DETAILED DESCRIPTION

[0043] To make this application easier to understand, the following examples will be used to further illustrate this application. These examples are for illustrative purposes only and are not intended to limit the scope of application of this application. Unless otherwise specified, the raw materials or components used in this application can be obtained through commercial channels or conventional methods.

[0044] Preparation Example

[0045] Table 1 Content of each raw material of water-based acrylic prepolymer emulsion (unit: × 10g)

[0046] Preparation Example Preparation Example 1 Preparation Example 2 Preparation Example 3 Butyl acrylate 30 20 40 Styrene 20 24 16 5-Hexanitrile 10 12 8 Dimethylpropylsulfonylaminoethyl methacrylate 8 10 6 Methacrylic acid 10 8 12 initiator 0.4 0.2 0.5 p-Toluenesulfonic acid 0.3 0.5 0.2 8-Hydroxy-2-octanone 16 18 14 Succinic acid dihydrazide 12 10 14 emulsifiers 0.6 0.5 1 Hand feel agent 0.4 1 0.2 water 892.3 895.8 888.1 total 1000 1000 1000

[0047] Preparation Example 1

[0048] A water-based acrylic prepolymer emulsion, the raw materials and raw material ratios of which are shown in Table 1.

[0049] A method for preparing a water-based acrylic prepolymer emulsion comprises the following steps:

[0050] The water is divided into three parts, namely the first part of water, the second part of water and the third part of water. The first part of water accounts for 10 wt% of the total water; the second part of water accounts for 60 wt% of the total water; and the third part of water accounts for 30 wt% of the total water.

[0051] S1. Add ammonium persulfate initiator to the first portion of water and stir for 5 minutes to obtain a premixed solution.

[0052] S2. Add styrene, 5-hexanenitrile, dimethylpropylsulfonamide ethyl methacrylate, methacrylic acid, and Tween 80 emulsifier to butyl acrylate and stir for 3 minutes. Then add the second portion of water and stir for 10 minutes. Then raise the temperature to 80°C and add the premixed solution dropwise for 2.5 hours. After the addition is complete, stir for 2 hours. Then add p-toluenesulfonic acid and stir for 3 minutes. Add 8-hydroxy-2-octanone and stir for 10 hours. Then cool to 25°C. Then add succinic acid dihydrazide, a feel agent, and the third portion of water and stir for 10 minutes to obtain a water-based acrylic prepolymer emulsion.

[0053] Among them, the hand feeling agent is the hand feeling agent TUC HF229W, and is selected from Guangzhou Haowei Chemical Technology Co., Ltd.

[0054] Preparation Example 2

[0055] A water-based acrylic prepolymer emulsion is prepared. The difference between the water-based acrylic prepolymer emulsion and Preparation Example 1 is that the raw material ratio of the water-based acrylic prepolymer emulsion is different, and the raw material ratio is shown in Table 1.

[0056] Preparation Example 3

[0057] A water-based acrylic prepolymer emulsion is prepared. The difference between the water-based acrylic prepolymer emulsion and Preparation Example 1 is that the raw material ratio of the water-based acrylic prepolymer emulsion is different, and the raw material ratio is shown in Table 1.

[0058] Example

[0059] Table 2 Content of each raw material of leather suede finishing agent (unit: g)

[0060] Example Example 1 Example 2 Example 3 Water-based acrylic prepolymer emulsion 1200 800 1500 Fatty alcohol polyoxyethylene ether 150 200 100 Isopropyl alcohol 150 200 100 Dipropylene glycol methyl ether 250 300 200 Anionic dye water 20 10 30

[0061] Example 1

[0062] A fur leather suede finishing agent, the raw materials and raw material ratios of which are shown in Table 2.

[0063] A method for preparing a suede finishing agent for fur leather comprises the following steps:

[0064] Fatty alcohol polyoxyethylene ether, isopropyl alcohol, and dipropylene glycol methyl ether were added to the aqueous acrylic prepolymer emulsion and stirred for 10 minutes. Anionic dye water was then added and stirred for 10 minutes to obtain a leather suede finishing agent.

[0065] Among them, fatty alcohol polyoxyethylene ether AEO-5 is selected from Shandong Baifeng New Material Technology Co., Ltd.; the anionic dye water is black dye water, specifically black dye water TUC KP-BLACK, and is selected from Guangzhou Haowei Chemical Technology Co., Ltd.; the water-based acrylic prepolymer emulsion is prepared by the method of Preparation Example 1.

[0066] Example 2

[0067] A fur leather suede finishing agent is provided, which differs from Example 1 in that the raw material ratio of the fur leather suede finishing agent is different, and the raw material ratio is shown in Table 2.

[0068] Example 3

[0069] A fur leather suede finishing agent is provided, which differs from Example 1 in that the raw material ratio of the fur leather suede finishing agent is different, and the raw material ratio is shown in Table 2.

[0070] Example 4

[0071] A fur leather suede finishing agent is disclosed, which differs from Example 1 in that the raw materials of the fur leather suede finishing agent include a water-based acrylic prepolymer emulsion from a different source and the water-based acrylic prepolymer emulsion is prepared using the method of Preparation Example 2.

[0072] Example 5

[0073] A fur leather suede finishing agent is disclosed, which differs from Example 1 in that the raw materials of the fur leather suede finishing agent include a water-based acrylic prepolymer emulsion from a different source, and the water-based acrylic prepolymer emulsion is prepared by the method of Preparation Example 3.

[0074] Comparative Example

[0075] Comparative Example 1

[0076] A suede finishing agent for fur leather is provided, which differs from Example 1 in that, in the preparation method of the aqueous acrylic prepolymer emulsion, an equal amount of water is used to replace methacrylic acid.

[0077] Comparative Example 2

[0078] A fur leather suede finishing agent is provided, which differs from Example 1 in that, in the preparation method of the aqueous acrylic prepolymer emulsion, an equal amount of water is used to replace 8-hydroxy-2-octanone.

[0079] Comparative Example 3

[0080] A fur leather suede finishing agent is provided, which differs from Example 1 in that, in the preparation method of the aqueous acrylic prepolymer emulsion, an equal amount of water is used to replace succinic acid dihydrazide.

[0081] Comparative Example 4

[0082] A suede finishing agent for fur leather is different from Example 1 in that, in the preparation method of the aqueous acrylic prepolymer emulsion, an equal amount of 5-hexanenitrile is used to replace dimethylpropylsulfonamide ethyl methacrylate.

[0083] Comparative Example 5

[0084] A suede finishing agent for fur leather is disclosed, which differs from Example 1 in that, in the preparation method of the aqueous acrylic prepolymer emulsion, an equal amount of dimethylpropylsulfonamidoethyl methacrylate is used to replace 5-hexanenitrile.

[0085] Comparative Example 6

[0086] A fur leather suede finishing agent, which differs from Example 1 in that, in the raw materials of the fur leather suede finishing agent, anionic dye water is replaced by an equal amount of cationic dye water, the cationic dye water is black dye water, and the black dye water is TUCDC-BLACK, which is selected from Guangzhou Haowei Chemical Technology Co., Ltd.

[0087] Application Examples

[0088] Application Example 1

[0089] A finishing process for a suede leather surface finishing agent comprises the following steps:

[0090] T0. Prepare sheepskin and sequentially process the skin through soaking, re-immersion in water, shearing, fleshing, degreasing, pickling, white tanning, filling, finishing, re-tanning and dyeing, and drying and finishing to obtain the leather embryo.

[0091] T1. Prepare water and a fur leather suede finishing agent in a weight ratio of 20:1. Then add the fur leather suede finishing agent to the water and stir for 2 minutes to obtain a diluted solution.

[0092] The suede finishing agent for fur leather was prepared by the method of Example 1.

[0093] T2. Use a spray gun to spray the diluted solution on the suede surface of the leather embryo, repeatedly spraying twice, with a total amount of 8g / square foot of the leather suede finishing agent sprayed. Then, dry and cure at a temperature of 80°C to complete the finishing process and obtain the leather.

[0094] Application Examples 2-5

[0095] A finishing process for a furry leather suede finishing agent is disclosed, which differs from Application Example 1 in that, in step T1, the source of the furry leather suede finishing agent is different, and the furry leather suede finishing agents of Application Examples 2-5 are prepared respectively by the methods of Examples 2-5.

[0096] Comparative Application Examples

[0097] Comparative Application Examples 1-6

[0098] A finishing process for a furry leather suede finishing agent is disclosed, which differs from Application Example 1 in that, in step T1, the source of the furry leather suede finishing agent is different, and the furry leather suede finishing agents of Comparative Application Examples 1-6 are prepared respectively by the methods of Comparative Examples 1-6.

[0099] Comparative Application Example 7

[0100] A process for applying a furry leather suede finishing agent differs from that of Application Example 1 in that, in step T1, the furry leather suede finishing agent is obtained from a different source and is prepared from the following raw materials: 300 g of ethylene glycol monoethyl ether, 200 g of isopropyl ketone, and 50 g of anionic dye solution. Isopropyl ketone is added to the ethylene glycol monoethyl ether and stirred for 2 minutes, followed by the addition of the anionic dye solution and stirring for 10 minutes to obtain the furry leather suede finishing agent.

[0101] Among them, the anionic dye water is black dye water, and the black dye water is TUC KP-BLACK, and is selected from Guangzhou Haowei Chemical Technology Co., Ltd.

[0102] Comparative Application Example 8

[0103] A finishing process for a furry leather suede finishing agent, which differs from Comparative Application Example 7 in that the total amount of the furry leather suede finishing agent sprayed in step T2 is different, and the total amount of the furry leather suede finishing agent sprayed is 40 g / square foot.

[0104] Performance testing

[0105] The fur leather obtained in Application Examples 1-5 and Comparative Application Examples 1-8 were respectively taken as samples, and the following performance tests were performed on the samples. The test results are shown in Table 3.

[0106] Among them, the color fastness to rubbing of the samples was tested according to AATCC 8-2007.

[0107] According to AATCC 107-2017, the water fastness of the samples was tested.

[0108] The color fastness to aging is tested using the following method: the sample is placed at a temperature of 60°C for 3 days, cooled to 23°C, and then the water fastness of the sample is tested according to AATCC 107-2017.

[0109] Table 3 Test results

[0110]

[0111] As can be seen from Table 3, the fur leather suede finishing agent of the present application is applied to the suede of the fur leather skin, which can greatly increase the color fixing effect, and the color fastness to dry friction is ≥ level 3.5, the color fastness to wet friction is ≥ level 3.0, the color fastness to water is ≥ level 4.0, and the color fastness to aging is ≥ level 4.0, so that the fur leather exhibits the advantages of high color fastness to friction, high color fastness to water, and high color fastness to aging.

[0112] Comparing Example 1 with Comparative Examples 1-3, no methacrylic acid was added to the aqueous acrylic prepolymer emulsion in Comparative Example 1; no 8-hydroxy-2-octanone was added to the aqueous acrylic prepolymer emulsion in Comparative Example 2; no succinic acid dihydrazide was added to the aqueous acrylic prepolymer emulsion in Comparative Example 3; and methacrylic acid, 8-hydroxy-2-octanone, and succinic acid dihydrazide were added to the aqueous acrylic prepolymer emulsion in Example 1. It can be seen that the simultaneous addition of methacrylic acid, 8-hydroxy-2-octanone, and succinic acid dihydrazide to the aqueous acrylic prepolymer emulsion, and the utilization of grafting and crosslinking reactions therebetween, significantly improves the color fastness to rubbing, water, and aging, resulting in higher performance and quality of the wool leather.

[0113] Comparing Example 1 with Comparative Examples 4-5, 5-hexanenitrile was added to the aqueous acrylic prepolymer emulsion in Comparative Example 4; dimethylpropylaminoethyl methacrylate was added to the aqueous acrylic prepolymer emulsion in Comparative Example 5; and 5-hexanenitrile and dimethylpropylaminoethyl methacrylate were added to the aqueous acrylic prepolymer emulsion in Example 1. It can be seen that the simultaneous addition of 5-hexanenitrile and dimethylpropylaminoethyl methacrylate to the aqueous acrylic prepolymer emulsion and the synergistic effect thereof can enhance the color fixing effect of the fur leather suede finishing agent and improve the use effect of the fur leather suede finishing agent.

[0114] By comparing Example 1 and Comparative Example 6, it can be seen that if the anionic dye water of the present application is replaced with cationic dye water, the use effect of the fur leather suede finishing agent is greatly reduced. It also shows that the fur leather suede finishing agent of the present application has a poor effect on cationic dye water and is more suitable for anionic dye water.

[0115] Comparing Example 1 and Comparative Example 7, in Comparative Example 7, the suede surface of the leather embryo is sprayed with the leather suede finishing agent in the prior art, and the total amount of spraying is 8g / square foot, that is, the total amount of dye water sprayed is 0.7273g / square foot; in Example 1, the suede surface of the leather embryo is sprayed with the leather suede finishing agent of the present application, and the total amount of spraying is 8g / square foot, that is, the total amount of dye water sprayed is 0.0904g / square foot. It can be seen from this that the leather suede finishing agent of the present application not only increases color fastness, but also greatly reduces the amount of dye water used, reducing the cost of dye water use. Combined with Comparative Example 8, the leather suede finishing agent in the prior art is sprayed with the suede surface of the leather embryo, and the total amount of spraying is 40g / square foot, that is, the total amount of dye water sprayed is 3.6364g / square foot. This shows that even if the spray rate of existing leather suede finishing agents is increased, and the total amount of dye water sprayed reaches approximately 3.5g / square foot, the effect of the leather suede finishing agent of the present application cannot be achieved. This also shows that the leather suede finishing agent of the present application not only greatly reduces the amount of dye water used, reducing waste and dye water usage costs, and thus reducing the cost of wastewater treatment, but also increases color fastness and improves the effect of the leather suede finishing agent.

[0116] It should be noted that the embodiments described above are only used to explain the present application and do not constitute any limitation to the present application. The present application has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present application may be modified as specified within the scope of the claims of the present application, and the invention may be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and embodiments, it does not mean that the present application is limited to the specific examples disclosed therein. On the contrary, the present application can be extended to all other methods and applications with the same function.

Claims

1. A suede finishing agent for leather, characterized by: The invention is mainly prepared from the following raw materials in parts by weight: 800-1500 parts of water-based acrylic prepolymer emulsion, 100-200 parts of fatty alcohol polyoxyethylene ether, 100-200 parts of isopropyl alcohol, 200-300 parts of dipropylene glycol methyl ether, and 10-30 parts of anionic dye water; The aqueous acrylic prepolymer emulsion is mainly prepared from the following raw materials in parts by weight: 20-40 parts of butyl acrylate, 16-24 parts of styrene, 8-12 parts of 5-hexanenitrile, 6-10 parts of dimethylpropylsulfonamidoethyl methacrylate, 8-12 parts of methacrylic acid, 0.2-0.5 parts of initiator, 0.2-0.5 parts of p-toluenesulfonic acid, 14-18 parts of 8-hydroxy-2-octanone, 10-14 parts of succinic acid dihydrazide, 0.5-1 parts of emulsifier, 0.2-1 parts of feel agent, and 888.1-895.8 parts of water.

2. The suede finishing agent for fur leather according to claim 1, characterized in that: The fatty alcohol polyoxyethylene ether is one or more of fatty alcohol polyoxyethylene ether AEO-3, fatty alcohol polyoxyethylene ether AEO-5, and fatty alcohol polyoxyethylene ether AEO-10.

3. The suede finishing agent for fur leather according to claim 1, characterized in that: The fur leather suede finishing agent is prepared by the following method: mixing water-based acrylic prepolymer emulsion, fatty alcohol polyoxyethylene ether, isopropyl alcohol and dipropylene glycol methyl ether, then adding anionic dye water and mixing to obtain the fur leather suede finishing agent.

4. The suede finishing agent for fur leather according to claim 1, characterized in that: The aqueous acrylic prepolymer emulsion is prepared by the following method: water is divided into three parts, namely the first part of water, the second part of water, and the third part of water; S1. Mix the initiator and the first portion of water to obtain a premixed solution; S2. Mix butyl acrylate, styrene, 5-hexanenitrile, dimethylpropylsulfonamide ethyl methacrylate, methacrylic acid, and an emulsifier, then add a second portion of water and mix, then heat to 75-85° C., dropwise add the premixed solution, and after the addition is complete, stir for 1-3 hours, then add p-toluenesulfonic acid and mix, add 8-hydroxy-2-octanone, stir for 8-12 hours, cool, then add succinic acid dihydrazide, a feel agent, and a third portion of water and mix to obtain a water-based acrylic prepolymer emulsion.

5. The suede finishing agent for fur leather according to claim 4, characterized in that: The first portion of water accounts for 5-15wt% of the total water; the second portion of water accounts for 50-70wt% of the total water; and the third portion of water accounts for 25-35wt% of the total water.

6. The suede finishing agent for fur leather according to claim 4, characterized in that: The addition time of the premixed solution is 2-3 hours.

7. The suede finishing agent for fur leather according to claim 1, characterized in that: The initiator is one or more of ammonium persulfate, sodium persulfate, and potassium persulfate.

8. The suede finishing agent for fur leather according to claim 1, characterized in that: The emulsifier is one or more of Tween 80, Tween 60, Tween 40, Span 80, Span 60, and Span 40.

9. The finishing process of the suede leather finishing agent according to any one of claims 1 to 8, characterized in that: It includes the following steps: T1. Prepare water and a leather suede finishing agent in a weight ratio of (10-30):1, and then mix the water and the leather suede finishing agent to obtain a diluent; T2. Spray the diluted solution on the suede surface of the leather embryo, repeatedly spray at least 2 times, the total amount of the leather suede finishing agent sprayed is 6-10g / square foot, dry and solidify, and complete the finishing process.

10. Fur leather, characterized by: The leather suede surface finishing agent is obtained by the coating process of claim 9.

Images