Fluff treatment method for white blank leather of double-face leather

Abstract

The invention relates to the technical field of double-face leather processing, and particularly discloses a fluffing treatment method of double-face leather white blank leather. The fluffing treatment method mainly comprises the following steps: S1, adding double-face leather white blank leather and water into a rotary drum; s2, a fluff treatment agent is added into a rotary drum, and rotary treatment is conducted; s3, repeating the step S2 for at least one time, and discharging liquid; s4, adding water, a hand feeling agent and organic acid into a rotary drum, carrying out rotation treatment, and discharging liquid, so as to obtain fluffy double-face leather white blank leather; the fluff treating agent is mainly prepared from the following raw materials: potassium hydrogen persulfate, cyclohexanone peroxide, sodium dioctyl sulfosuccinate, dipropylene glycol monomethyl ether, isopropanol and water. The fluff double-face leather white blank leather obtained through the fluff treatment method has the advantages of being small in hair fineness, good in thickness uniformity and good in thickness distribution uniformity, the hair face is fine, smooth in hand feeling, soft, comfortable, natural, soft and moist, the quality, the grade and the market competitiveness of double-face leather can be improved, and the market requirement is met.

Description

Technical Field

[0001] The present application relates to the technical field of fur leather processing, and more specifically, to a method for napping white embryo leather. Background Art

[0002] Fur leather is a leather product having two sides, one side is a fur side and the other side is a leather side. Fur leather is also a common daily necessity in life, and is widely used in the fields of clothing, footwear, furniture, etc. The processing of fur leather mainly includes soaking, re-immersion, degreasing, pickling, white tanning, filling, washing, obtaining the white embryo skin of fur leather, and then re-tanning, dyeing, drying and finishing the white embryo skin of fur leather to obtain fur leather. However, the applicant found in actual processing that the fur white embryo skin of fur leather obtained after white tanning has coarse hair on the fur side and poor hand feel, which affects the quality of fur leather. Summary of the invention

[0003] In order to reduce the average diameter of hair and thin the hair, the present application provides a method for treating the white embryo leather of fur, which adopts the following technical scheme: The method for fluffing white embryo leather mainly comprises the following steps: S1. Adding white embryo leather and water into a drum; S2. Add the fluff treatment agent into the drum and rotate for 50-70 minutes; S3, repeat the above step S2 at least once to drain the liquid; S4, adding water into the drum, then adding a feel agent and an organic acid, rotating the drum for 20-40 minutes, draining the liquid, completing the fluffing treatment, and obtaining a fluffed white embryo leather; The fluff treatment agent is mainly made of the following raw materials in parts by weight: 25-35 parts of potassium persulfate, 15-25 parts of cyclohexanone peroxide, 3-7 parts of sodium salt of dioctyl sulfosuccinate, 3-7 parts of dipropylene glycol methyl ether, 80-120 parts of isopropanol, and 80-120 parts of water.

[0004] The method for fuzzing white embryo leather of the present application, through the mutual coordination between each step, makes the hair on the hair surface of the fuzzed white embryo leather have a lower average diameter and coefficient of variation, the average diameter is less than 32μm, and the coefficient of variation is less than 26%, showing the advantages of small hair fineness, good thickness uniformity, and good thickness distribution. In addition, the hair surface is delicate, smooth, soft and comfortable, and naturally soft, which is beneficial to improving the quality of fur leather and meeting market demand.

[0005] Potassium persulfate and cyclohexanone peroxide are added to the raw materials of the fuzz treatment agent. They have good oxidizing effect, can oxidize protein and cause it to break, destroy the hair on the fur surface of the white embryo leather, make it fluffy and soft, enhance the glossiness, softness and elasticity, and utilize the synergistic effect between the two to improve the fineness of the hair, reduce the average diameter, and keep the hair in good thickness uniformity, improve the touch, enhance the fuzz treatment effect, and make the fuzzy white embryo leather have better quality and quality, which is conducive to improving the grade and market competitiveness of the fur leather.

[0006] Optionally, in step S3, the operation of step S2 is repeated one to four times. Preferably, in step S3, the operation of step S2 is repeated one to three times.

[0007] By adopting the above technical scheme, the number of repeated operations is limited, and thus the number of times the fuzz treatment agent is added to the white embryo leather is limited, thereby reducing the situation where the average diameter is high due to too few additions, and also reducing the situation where excessive damage to the hair is caused by too many additions. When the number of additions is two to four times, the hair of the fuzzified white embryo leather can maintain a good average diameter and coefficient of variation.

[0008] Optionally, the weight ratio of the white embryo leather to the water in step S1 is 1:(10-20), and the weight ratio of the white embryo leather to the fluff treatment agent is 1000:(4.3-4.7).

[0009] By adopting the above technical scheme, the addition amount of water and fuzz treatment agent in step S1 is limited to ensure that the fuzz treatment agent is in full contact with the white embryo leather, and the hair on the hair surface of the white embryo leather is fully oxidized, thereby reducing the average diameter, improving the uniformity of thickness, enhancing the fuzz treatment effect, and achieving ideal softness and touch.

[0010] Optionally, the weight ratio of the white embryo leather to the water in step S4 is 1:(10-20), and the weight ratio of the white embryo leather, the hand feeling agent and the organic acid is 1000:(7-9):(7-9).

[0011] By adopting the above technical solution, the addition amount of water, feel agent and organic acid in step S4 is limited to ensure full contact and penetration between the white embryo skin of the leather and the feel agent and organic acid, thereby enhancing the use effect of the feel agent and organic acid and ensuring the fluffing treatment effect.

[0012] In multiple embodiments, the weight ratio of the white embryo leather to the water in step S4 is 1:15. The weight ratio can also be set to 1:10, 1:11, 1:12, 1:13, 1:14, 1:16, 1:17, 1:18, 1:19, 1:20 as needed, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0013] In multiple embodiments, the weight ratio of white embryo leather, feel agent and formic acid is 1000:8:8. The weight ratio can also be set to 1000:7:7, 1000:7:8, 1000:7:9, 1000:8:7, 1000:8:9, 1000:9:7, 1000:9:8, 1000:9:9 as needed, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0014] Optionally, the feeling agent is one or more of the feeling agent LM-3032, the feeling agent XH-A50, the feeling agent XH-A90, the feeling agent AD4003, and the feeling agent AD4005.

[0015] By adopting the above technical solution, the hand feeling agent is limited, which is convenient for the selection of the hand feeling agent. Moreover, the hand feeling agent LM-3032, the hand feeling agent XH-A50, the hand feeling agent XH-A90, the hand feeling agent AD4003, and the hand feeling agent AD4005 can effectively improve the softness and elasticity of the white embryo leather, making the leather have better hand feeling and durability.

[0016] Optionally, the organic acid is one or more of formic acid, acetic acid, propionic acid, butyric acid, malic acid, and citric acid.

[0017] By adopting the above technical solution, the organic acid is limited, which facilitates the selection of the organic acid.

[0018] Optionally, in step S1, the temperature of water is 40-50°C; in step S2, the temperature of water is 10-30°C.

[0019] By adopting the above technical solution, the temperature of the water in step S1 is limited to ensure the treatment effect of the fuzz treatment agent on the white leather skin. The temperature of the water in step S2 is also limited to facilitate the treatment of the white leather skin by the hand feeling agent and the organic acid, ensuring the uniformity and stability of the fuzzy white leather skin.

[0020] In multiple embodiments, in step S2, the temperature of water is 23°C. The temperature can also be set to 10°C, 15°C, 20°C, 25°C, or 30°C as needed, but is not limited to the listed values. Other unlisted values ​​within the numerical range are also applicable.

[0021] Optionally, the average diameter of the hair on the wool surface of the white embryo leather is 35-50 μm.

[0022] By adopting the above technical solution, the average diameter of the hair on the fur surface of the white embryo leather of the fur leather is limited, the stability of the source of the white embryo leather of the fur leather is ensured, and the fluffing treatment of the white embryo leather of the fur leather is facilitated. In multiple embodiments, the average diameter of the hair on the fur surface of the white embryo leather of the fur leather is 38.67 μm, and the average diameter can also be set to 35 μm, 40 μm, 45 μm, 50 μm as needed, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0023] Optionally, the raw materials of the fluff treatment agent further include 4-6 parts by weight of a fluorine-containing surfactant.

[0024] By adopting the above technical scheme, a fluorinated surfactant is added to the fluff treatment agent, and the interaction between the fluorinated surfactant and the sodium salt of dioctyl sulfonated succinate is utilized to enhance the permeability and uniformity, which is beneficial to improving the synergistic effect between potassium persulfate and cyclohexanone peroxide, reducing the average diameter of the hair on the hair surface of the white embryo skin of the fluffed leather, improving the consistency of the thickness and uniformity of the hair diameter, and improving the quality of the leather.

[0025] Optionally, the fluorinated surfactant is a sodium sulfonate fluorinated surfactant, and the sodium sulfonate fluorinated surfactant is prepared by the following method: T1. At a temperature of 40-60°C and under the protection of an inert gas, ethanol and p-phenylenediamine are mixed, and then trifluoroethyl acrylate is added dropwise for 50-70 minutes. After the addition is complete, the mixture is stirred for 18-22 hours, and then ethanol is distilled off under reduced pressure to obtain a fluorine-containing intermediate; T2. At a temperature of 70-80°C and under the protection of inert gas, acetonitrile and the fluorine-containing intermediate are mixed, and then 2,4-butane sultone is added, and the mixture is stirred for 18-22 hours, cooled to room temperature, filtered, and washed to obtain a sulfonic acid fluorine-containing intermediate; T3. At a temperature of 40-60°C, mix water and the sulfonic acid fluorinated intermediate, then add sodium ethoxide, stir for 8-12 hours, and dry to constant weight to obtain a sodium sulfonic acid salt fluorinated surfactant.

[0026] Optionally, the weight ratio of p-phenylenediamine, trifluoroethyl acrylate, 2,4-butane sultone and sodium ethoxide is 10:(12-17):(11-14):(5-8).

[0027] By adopting the above technical scheme, p-phenylenediamine contains two amine groups. First, the carbon-carbon double bond in trifluoroethyl acrylate and an amino group in p-phenylenediamine are used for addition reaction to introduce fluorine and obtain a fluorine-containing intermediate. Then, the sulfonic group in 2,4-butane sultone and the remaining amino group in p-phenylenediamine are used for ring-opening reaction to introduce a sulfonic acid group to obtain a sulfonic acid fluorine-containing intermediate. After that, the sodium group in sodium ethoxide and the sulfonic acid group are used for acid-base reaction to introduce a sodium group to obtain a sodium sulfonate fluorine-containing surfactant. The preparation method of the present application is not only convenient for the preparation of sodium sulfonate fluorine-containing surfactants, but also introduces sodium sulfonate groups and fluorine groups, effectively increasing wettability and permeability, making it easier for the fuzz treatment agent to penetrate the internal structure of the hair, enhancing the fuzz treatment effect, reducing the average diameter and coefficient of variation, making the hair uniform in thickness, improving the distribution uniformity, and also making the leather have a better feel and quality.

[0028] In multiple embodiments, the weight ratio of p-phenylenediamine, trifluoroethyl acrylate, 2,4-butane sultone, and sodium ethoxide is 10:14.4:12.6:6.3. The weight ratio can also be set to 10:12:11:5, 10:12:11:8, 10:12:14:5, 10:12:14:8, 10:17:11:5, 10:17:11:8, 10:17:14:5, 10:17:14:8 as needed, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0029] Optionally, the weight ratio of p-phenylenediamine to ethanol is 1:(8-12).

[0030] By adopting the above technical solution, the amount of ethanol added is limited, which is beneficial to the uniformity of the dispersion of phenylenediamine and trifluoroethyl acrylate, and is also beneficial to their full contact and reaction, reducing the occurrence of side reactions, and ensuring the stability and use effect of the preparation of the sodium sulfonate fluorinated surfactant. In multiple implementation schemes, the weight ratio of p-phenylenediamine to ethanol is 1:10, and the weight ratio can also be set to 1:8, 1:9, 1:11, 1:12 as needed, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0031] Optionally, the weight ratio of p-phenylenediamine to acetonitrile is 1:(8-12).

[0032] By adopting the above technical solution, the amount of acetonitrile added is limited, which is beneficial to the uniformity of the dispersion of the fluorinated intermediate and 2,4-butane sultone, and is also beneficial to their full contact and reaction, reducing the occurrence of side reactions, and ensuring the stability and use effect of the preparation of the sodium sulfonate fluorinated surfactant. In multiple implementation schemes, the weight ratio of p-phenylenediamine and acetonitrile is 1:10, and the weight ratio can also be set to 1:8, 1:9, 1:11, 1:12 as needed, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0033] Optionally, the weight ratio of p-phenylenediamine to water is 1:(8-12).

[0034] By adopting the above technical solution, the amount of water added is limited, which is beneficial to the uniformity of the dispersion of the sulfonic acid fluorinated intermediate and sodium ethoxide, and is also beneficial to their full contact and reaction, reducing the occurrence of side reactions, and ensuring the stability of the preparation and use effect of the sodium sulfonate fluorinated surfactant. In multiple implementation schemes, the weight ratio of p-phenylenediamine and water is 1:10, and the weight ratio can also be set to 1:8, 1:9, 1:11, 1:12 as needed, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0035] In multiple embodiments, the dripping time of trifluoroethyl acrylate is 60 min. The dripping time can also be set to 50 min, 52 min, 55 min, 57 min, 62 min, 65 min, 67 min, 70 min as needed, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0036] The wool leather is obtained by adopting the method for napping white embryo leather, performing napping treatment on the white embryo leather, and then sequentially performing retanning, dyeing, and drying and finishing.

[0037] In summary, this application has at least the following beneficial effects: The method for fuzzing white embryo leather of the present application comprises the following steps: potassium persulfate and cyclohexanone peroxide are simultaneously added to the raw materials of a fuzz treatment agent, and the synergistic effect between the two is utilized to make the hair on the hair surface of the hair white embryo leather fluffy and soft, increase the glossiness, softness and elasticity, improve the hair fineness, reduce the average diameter, and also maintain good thickness uniformity of the hair, improve the touch, enhance the fuzzing treatment effect, make the average diameter of the hair less than 32 μm, and the coefficient of variation less than 26%, showing the advantages of small hair fineness, good thickness uniformity, and good uniform thickness distribution, and the hair surface is delicate, smooth to the touch, soft and comfortable, and naturally soft, which is conducive to improving the quality, grade and market competitiveness of the hair and meeting market demand. DETAILED DESCRIPTION

[0038] In order to make the present application easier to understand, the present application will be further described in detail below in conjunction with the examples, which are merely illustrative and are not intended to limit the scope of application of the present application. The raw materials or components used in the present application can be obtained through commercial routes or conventional methods unless otherwise specified.

[0039] Preparation Example Table 1 Amount of each raw material of the fluff treatment agent (unit: kg) Preparation Example Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 4 Preparation Example 5 Potassium persulfate 30 25 35 30 30 Cyclohexanone peroxide 20 25 15 20 20 Sulfosuccinate dioctyl ester sodium salt 5 7 3 5 5 Dipropylene glycol methyl ether 5 3 7 5 5 Isopropyl alcohol 100 80 120 100 100 water 100 120 80 100 100 Sulfonic acid sodium salt fluorinated surfactant 0 0 0 4 6 Preparation Example 1 A fluff treatment agent, the raw materials and raw material ratios of which are shown in Table 1.

[0040] A method for preparing a fluff treatment agent mainly comprises the following steps: At a rotation speed of 300 r / min, isopropanol, sodium salt of dioctyl sulfosuccinate, and dipropylene glycol methyl ether were added to water and stirred for 3 minutes. Potassium persulfate was then added and stirred for 3 minutes. Cyclohexanone peroxide was then added and stirred for 3 minutes to obtain a fluff treatment agent.

[0041] Preparation Example 2 A fluff treatment agent, which is different from Preparation Example 1 in that the raw material ratio of the fluff treatment agent is different, and the raw material ratio of the fluff treatment agent is shown in Table 1.

[0042] Preparation Example 3 A fluff treatment agent, which is different from Preparation Example 1 in that the raw material ratio of the fluff treatment agent is different, and the raw material ratio of the fluff treatment agent is shown in Table 1.

[0043] Preparation Example 4 A fluff treatment agent, the raw materials and raw material ratios of which are shown in Table 1.

[0044] Wherein, the sodium sulfonate fluorinated surfactant is prepared by the following method: T1. At a speed of 500 r / min, a temperature of 50°C and nitrogen protection, add 10 kg of p-phenylenediamine to 100 kg of ethanol and stir for 3 minutes. Then add 14.4 kg of trifluoroethyl acrylate dropwise for 60 minutes. After the addition is complete, stir for 20 hours. Then remove the ethanol by vacuum distillation to obtain a fluorine-containing intermediate.

[0045] T2. At a speed of 300 r / min, a temperature of 75° C., and under nitrogen protection, add the fluorinated intermediate obtained in step T1 to 100 kg of acetonitrile and stir for 3 minutes. Then add 12.6 kg of 2,4-butane sultone, stir for 20 hours, and cool to 25° C. Then filter and wash three times with acetonitrile, using 200 kg of acetonitrile each time to obtain a sulfonic acid fluorinated intermediate.

[0046] T3. Add the sulfonic acid fluorinated intermediate obtained in step T2 to 100 kg of water at a speed of 300 r / min and a temperature of 50° C., and stir for 3 min. Then add 6.3 kg of sodium ethoxide and stir for 10 h. Then dry at a temperature of 90° C. to constant weight to obtain a sodium sulfonic acid salt fluorinated surfactant.

[0047] A method for preparing a fluff treatment agent mainly comprises the following steps: At a rotation speed of 300 r / min, isopropanol, sodium salt of dioctyl sulfonate succinate, sodium salt of sulfonate fluorinated surfactant, and dipropylene glycol methyl ether were added to water and stirred for 3 minutes. Potassium persulfate was then added and stirred for 3 minutes. Cyclohexanone peroxide was then added and stirred for 3 minutes to obtain a fluff treatment agent.

[0048] Preparation Example 5 A fluff treatment agent, which is different from Preparation Example 4 in that the raw material ratio of the fluff treatment agent is different, and the raw material ratio of the fluff treatment agent is shown in Table 1.

[0049] Preparation Example 6 A fluff treatment agent, which is different from Preparation Example 4 in that, in the raw materials of the fluff treatment agent, an equal amount of fluorinated surfactant is used to replace the sodium sulfonate salt fluorinated surfactant, and the fluorinated surfactant is a fluorinated surfactant FS-3100.

[0050] Preparation Example 7 A fluff treatment agent, which is different from Preparation Example 4 in that, in the raw materials of the fluff treatment agent, an equal amount of fluorinated surfactant is used to replace the sodium sulfonate salt fluorinated surfactant, and the fluorinated surfactant is a fluorinated surfactant FS-10. Example

[0051] Example 1 A method for treating white embryo leather to make it fluffy mainly comprises the following steps: S0. Prepare white embryo leather, velvet treatment agent, hand feeling agent and organic acid.

[0052] The leather white embryo is cotton sheepskin, which is soaked, re-soaked, degreased, pickled, white tanned, filled, and washed to obtain the leather white embryo. Each piece of leather white embryo weighs 1kg, is 17mm thick, and has an area of ​​1.1m 2 The moisture content is 13wt%, and the average diameter of the hair on the hair surface of each piece of white leather is 38.67μm.

[0053] The fluff treatment agent is prepared by the method of Preparation Example 1; the hand feeling agent is the hand feeling agent LM-3032; and the organic acid is formic acid.

[0054] S1. Add 10 kg of white embryo leather and 150 kg of water at a temperature of 45° C. into a rotating drum at a rotation speed of 10 r / min.

[0055] S2. Add 60g of fluff treatment agent into the drum at a rotation speed of 10r / min and rotate for 60min.

[0056] S3. Repeat the above step S2 three times to drain the liquid.

[0057] S4. At a rotation speed of 10 r / min, add 150 kg of water at a temperature of 23° C. into the drum, then add 80 g of a feel agent and 80 g of an organic acid, rotate for 30 min, drain the liquid, complete the fluffing treatment, and obtain fluffed white embryo leather.

[0058] S5. The velvet-finished white embryo leather is subjected to retanning, dyeing, drying and finishing in sequence to obtain the wool leather.

[0059] Embodiment 2-7 A method for fuzzing white embryo leather is disclosed, which differs from Example 1 in that, in step S0, the sources of the fuzz treatment agent are different, and the fuzz treatment agents of Examples 2-7 are prepared respectively by the methods of Preparation Examples 2-7.

[0060] Example 8 A method for napping white embryo leather is provided, which differs from Example 1 in that step S3 is different.

[0061] Step S3 specifically includes: repeating the above step S2 operation four times to drain the liquid.

[0062] Example 9 A method for napping white embryo leather is provided, which differs from Example 1 in that step S3 is different.

[0063] Step S3 specifically includes: repeating the above step S2 twice to drain the liquid.

[0064] Example 10 A method for napping white embryo leather is provided, which differs from Example 1 in that step S3 is different.

[0065] Step S3 specifically includes: repeating the above step S2 operation once to drain the liquid.

[0066] Embodiment 11 A method for napping white embryo leather is provided, which differs from Example 1 in that step S1 and step S2 are different.

[0067] Step S1 specifically includes: adding 10 kg of white embryo leather and 100 kg of water at a temperature of 50° C. into a rotating drum at a rotation speed of 10 r / min.

[0068] Step S2 is specifically as follows: adding 5 g of a fluff treatment agent into the rotating drum at a rotation speed of 10 r / min, and rotating the drum for 70 minutes.

[0069] Example 12 A method for napping white embryo leather is provided, which differs from Example 1 in that step S1 and step S2 are different.

[0070] Step S1 specifically includes: adding 10 kg of white embryo leather and 200 kg of water at a temperature of 40° C. into a rotating drum at a rotation speed of 10 r / min.

[0071] Step S2 specifically includes: adding 7 g of fluff treatment agent into the drum at a rotation speed of 10 r / min, and rotating for 50 minutes.

[0072] Comparative Example Comparative Example 1 A method for treating white embryo leather to provide fluff, which differs from Example 1 in that, in step S0, an equal amount of potassium persulfate is used to replace cyclohexanone peroxide in the raw materials of the fluff treatment agent.

[0073] Comparative Example 2 A method for treating white embryo leather to velvet, which differs from Example 1 in that, in step S0, potassium persulfate is replaced by an equal amount of cyclohexanone peroxide in the raw materials of the velvet treatment agent.

[0074] Comparative Example 3 A method for napping white embryo leather is provided, which differs from Example 1 in that step S3 is different.

[0075] Step S3 specifically includes: draining the liquid.

[0076] Performance Testing The napped leather white embryo skins obtained in step S4 of Examples 1-12 and Comparative Examples 1-3 were respectively taken, and the following performance tests were performed on the napped leather white embryo skins. The test results are shown in Table 2.

[0077] Among them, a wool fineness meter was used to detect the hair diameter on the napped surface of the white embryo leather of the velvet leather. In addition, 350 hair diameters of each piece of velvet leather white embryo leather were randomly tested, and the average diameter, standard deviation, and coefficient of variation were calculated. The coefficient of variation is the ratio of the standard deviation to the average diameter. The coefficient of variation indicates the relative dispersion of the hair diameter. The smaller the coefficient of variation, the closer the hair diameter is to the average value, the more consistent the hair diameter is, and the more uniform the hair thickness is.

[0078] Table 2 Test results Test items Average diameter / (μm) Standard deviation S / (μm) Coefficient of variation CV / (%) Example 1 27.72 6.59 23.77 Example 2 28.96 6.84 23.62 Example 3 28.23 6.70 23.73 Example 4 25.25 5.16 20.44 Example 5 24.83 4.82 19.41 Example 6 26.82 6.16 22.97 Example 7 26.56 5.93 22.33 Example 8 27.57 6.93 25.14 Example 9 30.32 7.08 23.35 Example 10 31.99 7.41 23.16 Embodiment 11 28.55 6.76 23.68 Example 12 29.11 6.86 23.57 Comparative Example 1 33.26 8.79 26.43 Comparative Example 2 33.85 7.78 22.98 Comparative Example 3 34.27 7.85 22.91 As can be seen from Table 2, the velvet-treated white leather obtained by the velvet treatment method of the present application has a lower average diameter and coefficient of variation, with an average diameter of 24.83-31.99 μm and a coefficient of variation of 19.41-25.15%, showing the advantages of small hair fineness, good thickness uniformity, and good thickness distribution. The hair surface of the velvet-treated white leather is delicate, smooth, soft and comfortable, and naturally soft, which is beneficial to improving the quality of leather and meeting market demand.

[0079] Example 1 is compared with Comparative Examples 1-2. Potassium persulfate is added to the raw materials of the fluff treatment agent in Comparative Example 1; cyclohexanone peroxide is added to the raw materials of the fluff treatment agent in Comparative Example 2; potassium persulfate and cyclohexanone peroxide are added to the raw materials of the fluff treatment agent in Example 1. It can be seen that by adding potassium persulfate and cyclohexanone peroxide to the raw materials of the fluff treatment agent at the same time and utilizing the synergistic effect between the two, the average hair diameter and coefficient of variation of the white embryo skin of the fluffed leather can be significantly reduced.

[0080] Comparative Example 3, Example 1, and Examples 8-10 are compared. In the fluff treatment method of Comparative Example 3, a fluff treatment agent is added to the white embryo leather once; in the fluff treatment method of Example 10, a fluff treatment agent is added to the white embryo leather twice; in the fluff treatment method of Example 9, a fluff treatment agent is added to the white embryo leather three times; in the fluff treatment method of Example 1, a fluff treatment agent is added to the white embryo leather four times; in the fluff treatment method of Example 8, a fluff treatment agent is added to the white embryo leather five times. It can be seen that with the increase in the number of times the fluff treatment agent is added, the average diameter of the hair of the fluffed white embryo leather gradually decreases and tends to be flat, but the coefficient of variation increases first and then decreases, which may be due to the excessive number of times the fluff treatment agent is added, resulting in excessive damage to the hair, and when the number of times the fluff treatment agent is added to the white embryo leather is two to four times, the hair on the hair surface of the fluffed white embryo leather can show better performance.

[0081] Compare Example 1, Example 4, and Examples 6-7. In Example 1, no fluorinated surfactant is added to the raw materials of the fluff treatment agent; in Example 6, a fluorinated surfactant is added to the raw materials of the fluff treatment agent. FS-3100; Example 7 Adding fluorinated surfactant to the raw materials of the fluff treatment agent FS-10; Example 4: Adding a sodium sulfonate fluorinated surfactant to the raw materials of the fluff treatment agent. It can be seen that adding a fluorinated surfactant to the raw materials of the fluff treatment agent and utilizing the mutual cooperation between the fluorinated surfactant and the sodium salt of dioctyl sulfonated succinate can enhance the permeability and uniformity, which is beneficial to improving the use effect of the fluff treatment agent. In particular, the sodium sulfonate fluorinated surfactant of the present application can further reduce the average diameter of hair, improve the consistency of the thickness and distribution uniformity of the hair diameter, and make the wool leather show better performance and quality.

[0082] 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 is 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 present 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 functions.

Claims

1. A method for treating the white embryo leather of wool, characterized in that: The main steps are as follows: S1. Adding white embryo leather and water into a drum; S2. Add the fluff treatment agent into the drum and rotate for 50-70 minutes; S3, repeat the above step S2 at least once to drain the liquid; S4, adding water into the drum, then adding a feel agent and an organic acid, rotating the drum for 20-40 minutes, draining the liquid, completing the fluffing treatment, and obtaining a fluffed white embryo leather; The fluff treatment agent is mainly made of the following raw materials in parts by weight: 25-35 parts of potassium persulfate, 15-25 parts of cyclohexanone peroxide, 3-7 parts of sodium salt of dioctyl sulfosuccinate, 3-7 parts of dipropylene glycol methyl ether, 80-120 parts of isopropanol, and 80-120 parts of water.

2. The method for treating the white embryo leather of claim 1, characterized in that: The weight ratio of the white embryo leather to the water in step S1 is 1:(10-20), and the weight ratio of the white embryo leather to the fluff treatment agent is 1000:(5-7).

3. The method for treating the white embryo leather of claim 1, characterized in that: The weight ratio of the white embryo leather to the water in step S4 is 1:(10-20), and the weight ratio of the white embryo leather, the hand feeling agent and the organic acid is 1000:(7-9):(7-9).

4. The method for treating the white embryo leather of claim 1, characterized in that: The hand feeling agent is one or more of the hand feeling agent LM-3032, the hand feeling agent XH-A50, the hand feeling agent XH-A90, the hand feeling agent AD4003, and the hand feeling agent AD4005.

5. The method for treating the white embryo leather of claim 1, characterized in that: The organic acid is one or more of formic acid, acetic acid, propionic acid, butyric acid, malic acid and citric acid.

6. The method for treating the white embryo leather of claim 1, characterized in that: In step S1, the temperature of water is 40-50°C; in step S2, the temperature of water is 10-30°C.

7. The method for treating the white embryo leather of claim 1, characterized in that: The average diameter of the hair on the wool surface of the white embryo leather is 35-50 μm.

8. The method for treating the white embryo leather of claim 1, characterized in that: The raw materials of the fluff treatment agent also include 4-6 parts by weight of a fluorine-containing surfactant.

9. The method for treating white embryo leather of claim 8, characterized in that: The fluorinated surfactant is a sodium sulfonate fluorinated surfactant, and the sodium sulfonate fluorinated surfactant is prepared by the following method: T1. At a temperature of 40-60°C and under the protection of an inert gas, ethanol and p-phenylenediamine are mixed, and then trifluoroethyl acrylate is added dropwise for 50-70 minutes. After the addition is complete, the mixture is stirred for 18-22 hours, and then ethanol is distilled off under reduced pressure to obtain a fluorine-containing intermediate; T2. At a temperature of 70-80°C and under the protection of inert gas, acetonitrile and the fluorine-containing intermediate are mixed, and then 2,4-butane sultone is added, and the mixture is stirred for 18-22 hours, cooled to room temperature, filtered, and washed to obtain a sulfonic acid fluorine-containing intermediate; T3. At a temperature of 40-60°C, mix water and the sulfonic acid fluorinated intermediate, then add sodium ethoxide, stir for 8-12 hours, and dry to constant weight to obtain a sodium sulfonic acid salt fluorinated surfactant.

10. The method for treating white embryo leather of claim 9, characterized in that: The weight ratio of p-phenylenediamine, trifluoroethyl acrylate, 2,4-butane sultone and sodium ethoxide is 10:(12-17):(11-14):(5-8).