A kind of sheepskin imitation amber fur leather production process

Abstract

The invention relates to a fur leather production process, in particular to a sheepskin amber-like fur leather production process, wherein sheepskin blanks are subjected to skin selection, weighing, retanning, skin removal and water washing operations; wherein the retanning is to place the sheepskin blanks after preliminary dry finishing in a retanning liquid, and rotate at 25-35 DEG C for retanning, wherein the retanning liquid is composed of a fatliquor, formic acid, chrome powder and water, wherein the concentration of the fatliquor is 0.5g / L-1g / L, the concentration of the formic acid is 0.1g / L-1g / L, and the concentration of the chrome powder is 5-15g / L; the mass ratio of water to the sheepskin blanks in the retanning liquid is (5-15):1; 2) dyeing the leather washed in step 1); 3) neutralizing, dyeing, top-dyeing and washing the leather dyed in step 2); and 4) air-drying, moisture regaining, dragging, grinding, dust removal, hair ironing, dragging and amber finishing the leather washed in step 3). This process can realize the production of sheepskin imitation amber leather, improve the environmental performance of the leather, and reduce the manufacturing cost of the enterprise.

Description

Technical Field

[0001] The invention relates to a fur leather production process, in particular to a sheepskin amber-like fur leather production process. Background Art

[0002] Fur leather products have the comfort and beauty of fur products and the practicality of leather products, so they are widely used in clothing, shoes and various blankets. Color is the most direct visual effect of fur leather products and has the most important impact on the value of the product. In addition to the same color, if the fur and the leather are different in color, they must be dyed separately so that the dyed color will be pure and uniform. Especially when imitating amber fur leather, the elongation of the leather will cause cracks in the product, and the color and pattern are unnatural and the pattern is not clear, which is the biggest problem in the production of amber fur leather. Summary of the invention

[0003] The invention aims to provide a production process of sheepskin imitation amber leather. The sheepskin imitation amber leather produced by the process will not have cracks, has bright color, high yield, better fastness and scratch resistance, and has transparent color, natural pattern and clear pattern.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A sheepskin imitation amber leather production process, characterized in that it comprises the following steps:

[0006] 1) Selecting, weighing, retanning, removing and washing the sheepskin;

[0007] The retanning process comprises placing the sheepskin rawhide after preliminary dry finishing in a retanning solution and rotating the retanning solution at 25-35° C. The retanning solution is composed of a fatliquor, formic acid, chrome powder and water, wherein the concentration of the fatliquor is 0.5 g / L-1 g / L, the concentration of the formic acid is 0.1 g / L-1 g / L, and the concentration of the chrome powder is 5-15 g / L; the mass ratio of water to the sheepskin rawhide in the retanning solution is (5-15):1;

[0008] 2) dyeing the leather washed in step 1);

[0009] 3) neutralizing, dyeing, top-dyeing and washing the hides and skins dyed in step 2);

[0010] 4) drying, rehydration, shoveling, grinding, dust removal, hair ironing, shoveling, and amber coating the washed leather in step 3). The process realizes the production of sheepskin imitation amber leather, improves the environmental performance of the leather, and reduces the manufacturing cost of the enterprise.

[0011] Preferably, the dyeing is to put the washed hides into dyeing liquid for dyeing, rotate continuously at 65-70°C, add leveling agent A, rotate for 15-30 minutes, then add yellow dye, blue dye and red dye, rotate for 30-60 minutes, add formic acid in sequence, and then rotate for another 15-30 minutes before peeling. The hair dyeing liquid consists of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dye on the hair. The concentration of leveling agent A is 0.2g / L-1g / L, the concentration of yellow dye is 0.1g / L-1g / L, the concentration of blue dye is 0.3g / L-1g / L, the concentration of red dye is 0.3g / L-1g / L, and the concentration of formic acid is 0.5g / L-1g / L; wherein the mass ratio of water to hides in the hair dyeing liquid is (5-15):1.

[0012] Preferably, the neutralization is performed by placing the hide in a neutralizing solution and rotating it at 30°C to 50°C, wherein sodium formate is first added and rotated for 15-20 minutes, and then baking soda is added and rotated for 90-95 minutes. The neutralizing solution consists of sodium formate, baking soda and water, and the concentration of sodium formate is 0.5 to 2 g / L and the concentration of baking soda is 0.5 to 2 g / L. The mass ratio of water to hide in the neutralizing solution is (5 to 15): 1. The hide is peeled for cleaning and then the water is shaken off.

[0013] Preferably, the dyeing board is prepared by adding the neutralized hide into the dyeing liquid and continuously rotating at 20-25°C. The dyeing liquid consists of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 30-120 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 30-120 minutes. The pH is adjusted to 3.5-4.0 to fix the dye on the leather board, wherein the concentration of ammonia water is 1g / L-5g / L, the concentration of water is 1-3CC / L, the concentration of active tanning agent A is 0.5g / L-1.5g / L, the concentration of leather brown dye is 0.5g / L-1g / L, and the concentration of leather red dye is 0.1g / L-0.15g / L; wherein the mass ratio of water to hide in the dyeing liquid is (5-15):1.

[0014] Preferably, the top dyeing is to add the dyed hides into the top dyeing liquid, and continuously rotate at 25-35°C, wherein the top dyeing liquid is composed of leather yellow dye and water, and rotate for 30-50 minutes, and then add the active tanning agent B in sequence and rotate for 20-30 minutes, and then add formic acid in sequence and rotate for 20-30 minutes, and then check the penetration of the hides. If the penetration of the hides is poor, then add formic acid and rotate for 20-30 minutes. Finally, the hides are unpeeled, shaken off, washed, and shaken off to fix the dye on the leather board, wherein the concentration of the leather yellow dye is 0.5g / L-1g / L, the concentration of the active tanning agent B is 1cc / L-2cc / L, and the concentration of formic acid is 1g / L-2g / L, and the mass ratio of water to hides in the top dyeing liquid is (5-15):1.

[0015] Preferably, the wool washing is performed by adding the dyed hides into a water-cleaning agent, and continuously rotating at 20°C to 25°C, wherein the water-cleaning agent is composed of water, formic acid and active tanning agent C. After rotating for 30 to 40 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hide, wherein the concentration of formic acid is 0.1 to 0.5 g / L, and the concentration of active tanning agent C is 0.1 to 0.5 g / L.

[0016] Preferably, the amber finishing is treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent consists of 100-200 parts of aqueous water-spraying agent A and 100-200 parts of water by weight; after drying, a cationic wax bottom sealing treatment is carried out, sprayed 2-3 times crosswise, and then dried, wherein the cationic wax consists of 100-200 parts of cationic hard wax, 100-200 parts of cationic hard casein, 30-50 parts of cationic polyurethane resin and 250-400 parts of water by weight; thereafter, a primer is sprayed 4-5 times, and the primer is sprayed consists of 30-35 parts of dye water, 300-400 parts of water, 30-50 parts of permeable ultrafine acrylic acid, 100-150 parts of soft polyurethane top light, 60-80 parts of high-gloss medium-hard casein, 40-70 parts of high-gloss wax and 30-70 parts of wax emulsion by weight.

[0017] As a preference, it also includes a second primer spraying step, wherein the second primer spraying step is treated with a water splashing agent, sprayed once crosswise, and then sprayed once after drying. This time, the primer spraying coating is composed of 100-150 parts of soft polyurethane top light, 100-150 parts of water, and 10-20 parts of water-based hand feeling agent by weight, and the temperature is set at 100℃ / 30mpa-120℃ / 30mpa, and the primer spraying is performed once. The second primer spraying step is adopted because the amber coating color is not good enough, and the primer spraying can be performed once to make the amber coating color better.

[0018] Preferably, the step 1) further comprises the conventional process of alkali extraction by de-tanning the hides, using an automatic alkali extractor or alkaline substances such as sodium formate, baking soda and the like to increase the pH of the retanning solution to 4.5-5.0, and washing the hides with clean water after rotating for 1-3 hours.

[0019] The leather selection, weighing, washing, removing the skin, dry finishing, air drying, moisture regaining, shoveling, grinding, dust removal, ironing and shearing, and shoveling are conventional finishing steps, which are the same as general production operations.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the sheepskin imitation amber leather produced by the present invention will not crack, the product has bright color, high yield, better fastness and scratch resistance, the product has transparent color, natural pattern and clear pattern. DETAILED DESCRIPTION

[0021] The present invention is described in detail below through specific implementation examples.

[0022] Example 1

[0023] A production process of sheepskin imitation amber leather comprises the following steps:

[0024] 1) Leather selection: according to conventional process;

[0025] 2) Weighing: according to the conventional process;

[0026] 3) Retanning: The selected and weighed hides are placed in a retanning solution at 25°C, wherein the retanning solution is composed of a fatliquor, formic acid, chrome powder and water, and the concentration of the fatliquor is 0.5g / L, the concentration of the formic acid is 0.1g / L, and the concentration of the chrome powder is 5g / L; the mass ratio of water to white sheepskin in the retanning solution is 5:1;

[0027] 4) Peeling: according to the conventional process;

[0028] 5) Washing: Use clean water for washing;

[0029] 6) Dyeing hair: put the washed hides into dyeing liquid for dyeing, rotate continuously at 65°C, add leveling agent A, rotate for 15 minutes, then add yellow dye, blue dye, and red dye, rotate for another 30 minutes, add formic acid in sequence, and then rotate for another 15 minutes before taking out the hides, the hair dyeing liquid is composed of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dyes on the wool, the concentration of leveling agent A is 0.2g / L, the concentration of yellow dye is 0.1g / L, the concentration of blue dye is 0.3g / L, the concentration of red dye is 0.3g / L, and the concentration of formic acid is 0.5g / L; wherein, the mass ratio of water to hides in the hair dyeing liquid is 5:1;

[0030] 7) Neutralization: The dyed hides are placed in a neutralizing solution, and the hides are placed in the neutralizing solution and rotated at 30°C, wherein sodium formate is first added and rotated for 15 minutes, and then baking soda is added and rotated for 90 minutes. The neutralizing solution is composed of sodium formate, baking soda and water, and the concentration of sodium formate is 0.5g / L, and the concentration of baking soda is 0.5g / L; the mass ratio of water to hides in the neutralizing solution is 5:1, and the hides are taken out for washing, and then the water is shaken off;

[0031] 8) Dyeing board: The dyeing board is prepared by adding the neutralized hides into the dyeing board liquid and rotating continuously at 20°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 30 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 30 minutes. The pH is adjusted to 3.5 to fix the dye on the leather board. The concentration of ammonia water is 1g / L, water is 1CC / L, active tanning agent A is 0.5g / L, leather brown dye is 0.5g / L, and leather red dye is 0.1g / L. The mass ratio of water to hide in the dyeing board liquid is 5:1.

[0032] 9) Top dyeing: The top dyeing is to add the dyed hides into the top dyeing liquid, and rotate continuously at 25°C. The top dyeing liquid is composed of leather yellow dye and water. After rotating for 30 minutes, add the active tanning agent B in turn and rotate for 20 minutes, then add formic acid in turn and rotate for 20 minutes, check the penetration of the hides. If the penetration of the hides is poor, add formic acid and rotate for 20 minutes. Finally, the hides are taken out, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 0.5g / L, the concentration of the active tanning agent B is 1cc / L, and the concentration of the formic acid is 1g / L. The mass ratio of water to hides in the top dyeing liquid is 5:1.

[0033] 10) Wool washing: The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 20°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 30 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.1g / L, and the concentration of active tanning agent C is 0.1g / L.

[0034] 11) Drying: according to conventional process;

[0035] 12) Moisture regeneration: according to the conventional process;

[0036] 13) Dragline: Follow the conventional process;

[0037] 14) Grinding: according to conventional process;

[0038] 15) Dust removal: according to conventional process;

[0039] 16) Ironing and shearing: according to the conventional process;

[0040] 17) Dragline: Follow the conventional process;

[0041] 18) The amber finish is treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent is composed of 100 parts of aqueous water-spraying agent A and 100 parts of water by weight;

[0042] After drying, a cationic wax backing treatment is performed, which is cross-sprayed twice and then dried, wherein the cationic wax is composed of 100 parts of cationic hard wax, 100 parts of cationic hard casein, 30 parts of cationic polyurethane resin and 250 parts of water by weight;

[0043] After that, the primer is sprayed 4 times. The primer is composed of 30 parts of dye water, 300 parts of water, 30 parts of permeable ultrafine acrylic acid, 100 parts of soft polyurethane top light, 60 parts of high-gloss medium-hard casein, 40 parts of high-gloss wax and 30 parts of wax emulsion in parts by weight.

[0044] Example 2

[0045] A production process of sheepskin imitation amber leather comprises the following steps:

[0046] 1) Leather selection: according to conventional process;

[0047] 2) Weighing: according to the conventional process;

[0048] 3) Retanning: The selected and weighed hides are placed in a retanning solution at 35°C, wherein the retanning solution is composed of a fatliquor, formic acid, chrome powder and water, and the concentration of the fatliquor is 1g / L, the concentration of the formic acid is 1g / L, and the concentration of the chrome powder is 15g / L; the mass ratio of water to white sheepskin in the retanning solution is 15:1;

[0049] 4) Peeling: according to the conventional process;

[0050] 5) Washing: Use clean water for washing;

[0051] 6) Dyeing hair: put the washed hides into dyeing liquid for dyeing, rotate continuously at 70°C, add leveling agent A, rotate for 30 minutes, then add yellow dye, blue dye, and red dye, rotate for another 60 minutes, add formic acid in sequence, and then rotate for another 30 minutes before taking out the hides, the hair dyeing liquid is composed of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dyes on the wool, the concentration of leveling agent A is 1g / L, the concentration of yellow dye is 1g / L, the concentration of blue dye is 1g / L, the concentration of red dye is 1g / L, and the concentration of formic acid is 1g / L; wherein, the mass ratio of water to hides in the hair dyeing liquid is 15:1;

[0052] 7) Neutralization: The dyed hides are placed in a neutralizing solution, and rotated at 30°C. Sodium formate is first added and rotated for 20 minutes, and then baking soda is added and rotated for 95 minutes. The neutralizing solution is composed of sodium formate, baking soda and water, and the concentration of sodium formate is 2g / L and the concentration of baking soda is 2g / L. The mass ratio of water to hides in the neutralizing solution is 15:1. The hides are taken out for washing and then the water is shaken off.

[0053] 8) Dyeing board: The dyeing board is prepared by adding the neutralized hides into the dyeing board liquid and rotating continuously at 25°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 120 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 120 minutes. The pH is adjusted to 4.0 to fix the dye on the leather board. The concentration of ammonia water is 5g / L, water is 3CC / L, active tanning agent A is 1.5g / L, leather brown dye is 1g / L, and leather red dye is 1g / L. The mass ratio of water to hide in the dyeing board liquid is 15:1.

[0054] 9) Top dyeing: The top dyeing is to add the dyed hides into the top dyeing liquid, and rotate continuously at 35°C. The top dyeing liquid is composed of leather yellow dye and water. After rotating for 50 minutes, add the active tanning agent B in turn and rotate for 30 minutes, then add formic acid in turn and rotate for 30 minutes, check the penetration of the hides. If the penetration of the hides is poor, add formic acid and rotate for 30 minutes. Finally, the hides are taken out, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 1g / L, the concentration of the active tanning agent B is 2cc / L, and the concentration of the formic acid is 2g / L. The mass ratio of water to hides in the top dyeing liquid is 15:1.

[0055] 10) Wool washing: The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 25°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 40 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.5g / L, and the concentration of active tanning agent C is 0.5g / L.

[0056] 11) Drying: according to conventional process;

[0057] 12) Moisture regeneration: according to the conventional process;

[0058] 13) Dragline: Follow the conventional process;

[0059] 14) Grinding: according to conventional process;

[0060] 15) Dust removal: according to conventional process;

[0061] 16) Ironing and shearing: according to the conventional process;

[0062] 17) Dragline: Follow the conventional process;

[0063] 18) The amber finish is treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent is composed of 200 parts of aqueous water-spraying agent A and 200 parts of water by weight;

[0064] After drying, a cationic wax backing treatment is performed, which is cross-sprayed 3 times and then dried, wherein the cationic wax is composed of 200 parts of cationic hard wax, 200 parts of cationic hard casein, 50 parts of cationic polyurethane resin and 400 parts of water by weight;

[0065] After that, the primer is sprayed 5 times. The primer is composed of 35 parts of dye water, 400 parts of water, 50 parts of permeable ultrafine acrylic acid, 150 parts of soft polyurethane top light, 80 parts of high-gloss medium-hard casein, 70 parts of high-gloss wax and 70 parts of wax emulsion in parts by weight.

[0066] Example 3

[0067] A production process of sheepskin imitation amber leather comprises the following steps:

[0068] 1) Leather selection: according to conventional process;

[0069] 2) Weighing: according to the conventional process;

[0070] 3) Retanning: The selected and weighed hides are placed in a retanning solution at 30°C, wherein the retanning solution is composed of a fatliquor, formic acid, chrome powder and water, and the concentration of the fatliquor is 0.8g / L, the concentration of the formic acid is 0.8g / L, and the concentration of the chrome powder is 10g / L; the mass ratio of water to white sheepskin in the retanning solution is 10:1;

[0071] 4) Peeling: according to the conventional process;

[0072] 5) Washing: Use clean water for washing;

[0073] 6) Dyeing hair: put the washed hides into dyeing liquid for dyeing, rotate continuously at 68°C, add leveling agent A, rotate for 20 minutes, then add yellow dye, blue dye, and red dye, rotate for another 60 minutes, add formic acid in sequence, and then rotate for another 45 minutes before taking out the hides, the hair dyeing liquid is composed of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dyes on the wool, the concentration of leveling agent A is 0.5g / L, the concentration of yellow dye is 0.5g / L, the concentration of blue dye is 0.5g / L, the concentration of red dye is 0.5g / L, and the concentration of formic acid is 0.8g / L; wherein, the mass ratio of water to hides in the hair dyeing liquid is 10:1;

[0074] 7) Neutralization: The dyed hides are placed in a neutralizing solution, and the hides are placed in the neutralizing solution and rotated at 40°C, wherein sodium formate is first added and rotated for 18 minutes, and then baking soda is added and rotated for 92 minutes. The neutralizing solution is composed of sodium formate, baking soda and water, and the concentration of sodium formate is 1.5 g / L, and the concentration of baking soda is 1.5 g / L; the mass ratio of water to hides in the neutralizing solution is 10:1, and the hides are taken out for washing, and then the water is shaken off;

[0075] 8) Dyeing board: The dyeing board is prepared by adding the neutralized hides into the dyeing board liquid and rotating continuously at 22°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 60 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 60 minutes. The pH is adjusted to 3.8 to fix the dye on the leather board. The concentration of ammonia water is 3g / L, water is 2CC / L, active tanning agent A is 1.0g / L, leather brown dye is 0.8g / L, and leather red dye is 0.8g / L. The mass ratio of water to hide in the dyeing board liquid is 10:1.

[0076] 9) Top dyeing: The top dyeing is to add the leather after dyeing into the top dyeing liquid, and rotate continuously at 30°C. The top dyeing liquid is composed of leather yellow dye and water. After rotating for 40 minutes, add the active tanning agent B in turn and rotate for 40 minutes, then add formic acid in turn and rotate for 25 minutes, check the penetration of the leather. If the penetration of the leather is poor, add formic acid and rotate for 25 minutes. Finally, the leather is taken out, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 0.8g / L, the concentration of the active tanning agent B is 1.5cc / L, and the concentration of formic acid is 1.5g / L. The mass ratio of water to leather in the top dyeing liquid is 10:1;

[0077] 10) Wool washing: The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 20°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 35 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.3g / L, and the concentration of active tanning agent C is 0.3g / L.

[0078] 11) Drying: according to conventional process;

[0079] 12) Moisture regeneration: according to the conventional process;

[0080] 13) Dragline: Follow the conventional process;

[0081] 14) Grinding: according to conventional process;

[0082] 15) Dust removal: according to conventional process;

[0083] 16) Ironing and shearing: according to the conventional process;

[0084] 17) Dragline: Follow the conventional process;

[0085] 18) The amber finish is treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent is composed of 150 parts of aqueous water-spraying agent A and 150 parts of water by weight;

[0086] After drying, a cationic wax backing treatment is performed, which is cross-sprayed 3 times and then dried, wherein the cationic wax is composed of 150 parts of cationic hard wax, 150 parts of cationic hard casein, 40 parts of cationic polyurethane resin and 300 parts of water by weight;

[0087] After that, the primer is sprayed 5 times. The primer is composed of 32 parts of dye water, 350 parts of water, 40 parts of permeable ultrafine acrylic acid, 120 parts of soft polyurethane top light, 70 parts of high-gloss medium-hard casein, 50 parts of high-gloss wax and 40 parts of wax emulsion in parts by weight.

[0088] Example 4

[0089] A production process of sheepskin imitation amber leather comprises the following steps:

[0090] 1) Leather selection: according to conventional process;

[0091] 2) Weighing: according to the conventional process;

[0092] 3) Retanning: The selected and weighed hides are placed in a retanning solution at 25°C, wherein the retanning solution is composed of a fatliquor, formic acid, chrome powder and water, and the concentration of the fatliquor is 0.5g / L, the concentration of the formic acid is 0.1g / L, and the concentration of the chrome powder is 5g / L; the mass ratio of water to white sheepskin in the retanning solution is 5:1;

[0093] 4) Peeling: according to the conventional process;

[0094] 5) Washing: Use clean water for washing;

[0095] 6) Dyeing hair: put the washed hides into dyeing liquid for dyeing, rotate continuously at 65°C, add leveling agent A, rotate for 15 minutes, then add yellow dye, blue dye, and red dye, rotate for another 30 minutes, add formic acid in sequence, and then rotate for another 15 minutes before taking out the hides, the hair dyeing liquid is composed of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dyes on the wool, the concentration of leveling agent A is 0.2g / L, the concentration of yellow dye is 0.1g / L, the concentration of blue dye is 0.3g / L, the concentration of red dye is 0.3g / L, and the concentration of formic acid is 0.5g / L; wherein, the mass ratio of water to hides in the hair dyeing liquid is 5:1;

[0096] 7) Neutralization: The dyed hides are placed in a neutralizing solution, and the hides are placed in the neutralizing solution and rotated at 30°C, wherein sodium formate is first added and rotated for 15 minutes, and then baking soda is added and rotated for 90 minutes. The neutralizing solution is composed of sodium formate, baking soda and water, and the concentration of sodium formate is 0.5g / L, and the concentration of baking soda is 0.5g / L; the mass ratio of water to hides in the neutralizing solution is 5:1, and the hides are taken out for washing, and then the water is shaken off;

[0097] 8) Dyeing board: The dyeing board is prepared by adding the neutralized hides into the dyeing board liquid and rotating continuously at 20°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 30 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 30 minutes. The pH is adjusted to 3.5 to fix the dye on the leather board. The concentration of ammonia water is 1g / L, water is 1CC / L, active tanning agent A is 0.5g / L, leather brown dye is 0.5g / L, and leather red dye is 0.1g / L. The mass ratio of water to hide in the dyeing board liquid is 5:1.

[0098] 9) Top dyeing: The top dyeing is to add the dyed hides into the top dyeing liquid, and rotate continuously at 25°C. The top dyeing liquid is composed of leather yellow dye and water. After rotating for 30 minutes, add the active tanning agent B in turn and rotate for 20 minutes, then add formic acid in turn and rotate for 20 minutes, check the penetration of the hides. If the penetration of the hides is poor, add formic acid and rotate for 20 minutes. Finally, the hides are taken out, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 0.5g / L, the concentration of the active tanning agent B is 1cc / L, and the concentration of the formic acid is 1g / L. The mass ratio of water to hides in the top dyeing liquid is 5:1.

[0099] 10) Wool washing: The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 20°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 30 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.1g / L, and the concentration of active tanning agent C is 0.1g / L.

[0100] 11) Drying: according to conventional process;

[0101] 12) Moisture regeneration: according to the conventional process;

[0102] 13) Dragline: Follow the conventional process;

[0103] 14) Grinding: according to conventional process;

[0104] 15) Dust removal: according to conventional process;

[0105] 16) Ironing and shearing: according to the conventional process;

[0106] 17) Dragline: Follow the conventional process;

[0107] 18) The amber finish is treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent is composed of 100 parts of aqueous water-spraying agent A and 100 parts of water by weight;

[0108] After drying, a cationic wax backing treatment is performed, which is cross-sprayed twice and then dried, wherein the cationic wax is composed of 100 parts of cationic hard wax, 100 parts of cationic hard casein, 30 parts of cationic polyurethane resin and 250 parts of water by weight;

[0109] After that, the primer is sprayed 4 times. The primer is composed of 30 parts of dye water, 300 parts of water, 30 parts of permeable ultrafine acrylic acid, 100 parts of soft polyurethane top light, 60 parts of high-gloss medium-hard casein, 40 parts of high-gloss wax and 30 parts of wax emulsion in parts by weight.

[0110] 19) The second spray primer is treated with a water splashing agent, sprayed crosswise once, and after drying, sprayed once. This time the primer is composed of 100 parts of soft polyurethane top light, 100 parts of water, and 10 parts of water-based hand feeling agent B by weight. The temperature is set at 100℃ / 30mpa, and the primer is sprayed once.

[0111] Example 5

[0112] A production process of sheepskin imitation amber leather comprises the following steps:

[0113] 1) Leather selection: according to conventional process;

[0114] 2) Weighing: according to the conventional process;

[0115] 3) Retanning: The selected and weighed hides are placed in a retanning solution at 35°C, wherein the retanning solution is composed of a fatliquor, formic acid, chrome powder and water, and the concentration of the fatliquor is 1g / L, the concentration of the formic acid is 1g / L, and the concentration of the chrome powder is 15g / L; the mass ratio of water to white sheepskin in the retanning solution is 15:1;

[0116] 4) Peeling: according to the conventional process;

[0117] 5) Washing: Use clean water for washing;

[0118] 6) Dyeing hair: put the washed hides into dyeing liquid for dyeing, rotate continuously at 70°C, add leveling agent A, rotate for 30 minutes, then add yellow dye, blue dye, and red dye, rotate for another 60 minutes, add formic acid in sequence, and then rotate for another 30 minutes before taking out the hides, the hair dyeing liquid is composed of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dyes on the wool, the concentration of leveling agent A is 1g / L, the concentration of yellow dye is 1g / L, the concentration of blue dye is 1g / L, the concentration of red dye is 1g / L, and the concentration of formic acid is 1g / L; wherein, the mass ratio of water to hides in the hair dyeing liquid is 15:1;

[0119] 7) Neutralization: The dyed hides are placed in a neutralizing solution, and rotated at 30°C. Sodium formate is first added and rotated for 20 minutes, and then baking soda is added and rotated for 95 minutes. The neutralizing solution is composed of sodium formate, baking soda and water, and the concentration of sodium formate is 2g / L and the concentration of baking soda is 2g / L. The mass ratio of water to hides in the neutralizing solution is 15:1. The hides are taken out for washing and then the water is shaken off.

[0120] 8) Dyeing board: The dyeing board is prepared by adding the neutralized hides into the dyeing board liquid and rotating continuously at 25°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 120 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 120 minutes. The pH is adjusted to 4.0 to fix the dye on the leather board. The concentration of ammonia water is 5g / L, water is 3CC / L, active tanning agent A is 1.5g / L, leather brown dye is 1g / L, and leather red dye is 1g / L. The mass ratio of water to hide in the dyeing board liquid is 15:1.

[0121] 9) Top dyeing: The top dyeing is to add the dyed hides into the top dyeing liquid, and rotate continuously at 35°C. The top dyeing liquid is composed of leather yellow dye and water. After rotating for 50 minutes, add the active tanning agent B in turn and rotate for 30 minutes, then add formic acid in turn and rotate for 30 minutes, check the penetration of the hides. If the penetration of the hides is poor, add formic acid and rotate for 30 minutes. Finally, the hides are taken out, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 1g / L, the concentration of the active tanning agent B is 2cc / L, and the concentration of the formic acid is 2g / L. The mass ratio of water to hides in the top dyeing liquid is 15:1.

[0122] 10) Wool washing: The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 25°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 40 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.5g / L, and the concentration of active tanning agent C is 0.5g / L.

[0123] 11) Drying: according to conventional process;

[0124] 12) Moisture regeneration: according to the conventional process;

[0125] 13) Dragline: Follow the conventional process;

[0126] 14) Grinding: according to conventional process;

[0127] 15) Dust removal: according to conventional process;

[0128] 16) Ironing and shearing: according to the conventional process;

[0129] 17) Dragline: Follow the conventional process.

[0130] 18) The amber finish is treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent is composed of 200 parts of aqueous water-spraying agent A and 200 parts of water by weight;

[0131] After drying, a cationic wax backing treatment is performed, which is cross-sprayed 3 times and then dried, wherein the cationic wax is composed of 200 parts of cationic hard wax, 200 parts of cationic hard casein, 50 parts of cationic polyurethane resin and 400 parts of water by weight;

[0132] Then, the primer is sprayed for 5 times, wherein the primer is composed of 35 parts of dye water, 400 parts of water, 50 parts of permeable ultrafine acrylic acid, 150 parts of soft polyurethane top light, 80 parts of high-gloss medium-hard casein, 70 parts of high-gloss wax and 70 parts of wax emulsion in parts by weight;

[0133] 19) The second spray primer is treated with a water splashing agent, sprayed crosswise once, and after drying, sprayed once with a primer. This time, the primer consists of 150 parts of soft polyurethane top light, 150 parts of water, and 20 parts of water-based hand feeling agent B by weight. The temperature is set at 120℃ / 30mpa, and the primer is sprayed once.

[0134] Example 6

[0135] A production process of sheepskin imitation amber leather comprises the following steps:

[0136] 1) Leather selection: according to conventional process;

[0137] 2) Weighing: according to the conventional process;

[0138] 3) Retanning: The selected and weighed hides are placed in a retanning solution at 30°C, wherein the retanning solution is composed of a fatliquor, formic acid, chrome powder and water, and the concentration of the fatliquor is 0.8g / L, the concentration of the formic acid is 0.8g / L, and the concentration of the chrome powder is 10g / L; the mass ratio of water to white sheepskin in the retanning solution is 10:1;

[0139] 4) Peeling: according to the conventional process;

[0140] 5) Washing: Use clean water for washing;

[0141] 6) Dyeing hair: put the washed hides into dyeing liquid for dyeing, rotate continuously at 68°C, add leveling agent A, rotate for 20 minutes, then add yellow dye, blue dye, and red dye, rotate for another 60 minutes, add formic acid in sequence, and then rotate for another 45 minutes before taking out the hides, the hair dyeing liquid is composed of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dyes on the wool, the concentration of leveling agent A is 0.5g / L, the concentration of yellow dye is 0.5g / L, the concentration of blue dye is 0.5g / L, the concentration of red dye is 0.5g / L, and the concentration of formic acid is 0.8g / L; wherein, the mass ratio of water to hides in the hair dyeing liquid is 10:1;

[0142] 7) Neutralization: The dyed hides are placed in a neutralizing solution, and the hides are placed in the neutralizing solution and rotated at 40°C, wherein sodium formate is first added and rotated for 18 minutes, and then baking soda is added and rotated for 92 minutes. The neutralizing solution is composed of sodium formate, baking soda and water, and the concentration of sodium formate is 1.5 g / L, and the concentration of baking soda is 1.5 g / L; the mass ratio of water to hides in the neutralizing solution is 10:1, and the hides are taken out for washing, and then the water is shaken off;

[0143] 8) Dyeing board: The dyeing board is prepared by adding the neutralized hides into the dyeing board liquid and rotating continuously at 22°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 60 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 60 minutes. The pH is adjusted to 3.8 to fix the dye on the leather board. The concentration of ammonia water is 3g / L, water is 2CC / L, active tanning agent A is 1.0g / L, leather brown dye is 0.8g / L, and leather red dye is 0.8g / L. The mass ratio of water to hide in the dyeing board liquid is 10:1.

[0144] 9) Top dyeing: The top dyeing is to add the leather after dyeing into the top dyeing liquid, and rotate continuously at 30°C. The top dyeing liquid is composed of leather yellow dye and water. After rotating for 40 minutes, add the active tanning agent B in turn and rotate for 40 minutes, then add formic acid in turn and rotate for 25 minutes, check the penetration of the leather. If the penetration of the leather is poor, add formic acid and rotate for 25 minutes. Finally, the leather is taken out, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 0.8g / L, the concentration of the active tanning agent B is 1.5cc / L, and the concentration of formic acid is 1.5g / L. The mass ratio of water to leather in the top dyeing liquid is 10:1;

[0145] 10) Wool washing: The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 20°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 35 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.3g / L, and the concentration of active tanning agent C is 0.3g / L.

[0146] 11) Drying: according to conventional process;

[0147] 12) Moisture regeneration: according to the conventional process;

[0148] 13) Dragline: Follow the conventional process;

[0149] 14) Grinding: according to conventional process;

[0150] 15) Dust removal: according to conventional process;

[0151] 16) Ironing and shearing: according to the conventional process;

[0152] 17) Dragline: Follow the conventional process;

[0153] 18) The amber finish is treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent is composed of 150 parts of aqueous water-spraying agent A and 150 parts of water by weight;

[0154] After drying, a cationic wax backing treatment is performed, which is cross-sprayed 3 times and then dried, wherein the cationic wax is composed of 150 parts of cationic hard wax, 150 parts of cationic hard casein, 40 parts of cationic polyurethane resin and 300 parts of water by weight;

[0155] Then, the primer is sprayed for 5 times, wherein the primer is composed of 32 parts of dye water, 350 parts of water, 40 parts of permeable ultrafine acrylic acid, 120 parts of soft polyurethane top light, 70 parts of high-gloss medium-hard casein, 50 parts of high-gloss wax and 40 parts of wax emulsion in parts by weight;

[0156] 19) The second spray primer is treated with a water splashing agent, sprayed crosswise once, and after drying, sprayed once. This time the primer is composed of 120 parts of soft polyurethane top light, 120 parts of water, and 15 parts of water-based hand feeling agent B by weight. The temperature is set at 110℃ / 30mpa, and the primer is sprayed once.

[0157] Example 7

[0158] A production process of sheepskin imitation amber leather comprises the following steps:

[0159] 1) Leather selection: according to conventional process;

[0160] 2) Weighing: according to the conventional process;

[0161] 3) Retanning: The selected and weighed hides are placed in a retanning solution at 25°C, wherein the retanning solution is composed of a fatliquor, formic acid, chrome powder and water, and the concentration of the fatliquor is 0.5g / L, the concentration of the formic acid is 0.1g / L, and the concentration of the chrome powder is 5g / L; the mass ratio of water to white sheepskin in the retanning solution is 5:1;

[0162] 4) Alkali extraction: Use automatic alkali extractor or alkaline substances such as sodium formate, baking soda and soda to increase the pH of the retanning solution to 4.5. After rotating for 1 hour, wash the hides with clean water.

[0163] 5) Peeling: according to the conventional process;

[0164] 6) Washing: Wash with clean water;

[0165] 7) Dyeing hair: put the washed hides into dyeing liquid for dyeing, rotate continuously at 65°C, add leveling agent A, rotate for 15 minutes, then add yellow dye, blue dye, and red dye, rotate for another 30 minutes, add formic acid in sequence, and then rotate for another 15 minutes before taking out the hides, the hair dyeing liquid is composed of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dyes on the wool, the concentration of leveling agent A is 0.2g / L, the concentration of yellow dye is 0.1g / L, the concentration of blue dye is 0.3g / L, the concentration of red dye is 0.3g / L, and the concentration of formic acid is 0.5g / L; wherein, the mass ratio of water to hides in the hair dyeing liquid is 5:1;

[0166] 8) Neutralization: The dyed hides are placed in a neutralizing solution, and the hides are placed in the neutralizing solution and rotated at 30°C, wherein sodium formate is first added and rotated for 15 minutes, and then baking soda is added and rotated for 90 minutes, wherein the neutralizing solution is composed of sodium formate, baking soda and water, and the concentration of sodium formate is 0.5 g / L, and the concentration of baking soda is 0.5 g / L; the mass ratio of water to hides in the neutralizing solution is 5:1, the hides are taken out for washing, and then the water is shaken off;

[0167] 9) Dyeing board: The dyeing board is prepared by adding the neutralized hides into the dyeing board liquid and rotating continuously at 20°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 30 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 30 minutes. The pH is adjusted to 3.5 to fix the dye on the leather board. The concentration of ammonia water is 1g / L, water is 1CC / L, active tanning agent A is 0.5g / L, leather brown dye is 0.5g / L, and leather red dye is 0.1g / L. The mass ratio of water to hide in the dyeing board liquid is 5:1.

[0168] 10) Top dyeing: The top dyeing is to add the leather after dyeing into the top dyeing liquid, and rotate continuously at 25°C. The top dyeing liquid is composed of leather yellow dye and water. After rotating for 30 minutes, add the active tanning agent B in turn and rotate for 20 minutes, then add formic acid in turn and rotate for 20 minutes, check the penetration of the leather. If the penetration of the leather is poor, add formic acid and rotate for 20 minutes. Finally, the leather is peeled, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 0.5g / L, the concentration of the active tanning agent B is 1cc / L, and the concentration of the formic acid is 1g / L. The mass ratio of water to leather in the top dyeing liquid is 5:1;

[0169] 11) Wool washing: The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 20°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 30 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.1g / L, and the concentration of active tanning agent C is 0.1g / L.

[0170] 12) Drying: according to conventional process;

[0171] 13) Rehumidification: according to the conventional process;

[0172] 14) Dragline: Follow the conventional process;

[0173] 15) Grinding: according to conventional process;

[0174] 16) Dust removal: according to conventional process;

[0175] 17) Ironing and shearing: according to the conventional process;

[0176] 18) Dragline: Follow the conventional process;

[0177] 19) Amber finishing: treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent is composed of 100 parts of aqueous water-spraying agent A and 100 parts of water by weight;

[0178] After drying, a cationic wax backing treatment is performed, which is cross-sprayed twice and then dried, wherein the cationic wax is composed of 100 parts of cationic hard wax, 100 parts of cationic hard casein, 30 parts of cationic polyurethane resin and 250 parts of water by weight;

[0179] Then, the primer is sprayed for 4 times, wherein the primer is composed of 30 parts of dye water, 300 parts of water, 30 parts of permeable ultrafine acrylic acid, 100 parts of soft polyurethane top light, 60 parts of high-gloss medium-hard casein, 40 parts of high-gloss wax and 30 parts of wax emulsion in parts by weight;

[0180] 20) The second spray primer is treated with a water splashing agent, sprayed crosswise once, and after drying, sprayed with a primer once. This time the primer is composed of 100 parts of soft polyurethane top light, 100 parts of water, and 10 parts of water-based hand feeling agent B by weight. The temperature is set at 100℃ / 30mpa, and the primer is sprayed once.

[0181] Example 8

[0182] A production process of sheepskin imitation amber leather comprises the following steps:

[0183] 1) Leather selection: according to conventional process;

[0184] 2) Weighing: according to the conventional process;

[0185] 3) Retanning: The selected and weighed hides are placed in a retanning solution at 35°C, wherein the retanning solution is composed of a fatliquor, formic acid, chrome powder and water, and the concentration of the fatliquor is 1g / L, the concentration of the formic acid is 1g / L, and the concentration of the chrome powder is 15g / L; the mass ratio of water to white sheepskin in the retanning solution is 15:1;

[0186] 4) Alkali extraction: Use automatic alkali extracting agent or alkaline substances such as sodium formate, baking soda and soda to increase the pH of the retanning solution to 5. After rotating for 3 hours, wash the hides with clean water.

[0187] 5) Peeling: according to the conventional process;

[0188] 6) Washing: Wash with clean water;

[0189] 7) Dyeing hair: put the washed hides into dyeing liquid for dyeing, rotate continuously at 70°C, add leveling agent A, rotate for 30 minutes, then add yellow dye, blue dye, and red dye, rotate for another 60 minutes, add formic acid in sequence, and then rotate for another 30 minutes before taking out the hides, the hair dyeing liquid is composed of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dyes on the wool, the concentration of leveling agent A is 1g / L, the concentration of yellow dye is 1g / L, the concentration of blue dye is 1g / L, the concentration of red dye is 1g / L, and the concentration of formic acid is 1g / L; wherein, the mass ratio of water to hides in the hair dyeing liquid is 15:1;

[0190] 8) Neutralization: The dyed hides are placed in a neutralizing solution, and rotated at 30°C. Sodium formate is first added and rotated for 20 minutes, and then baking soda is added and rotated for 95 minutes. The neutralizing solution is composed of sodium formate, baking soda and water, and the concentration of sodium formate is 2g / L and the concentration of baking soda is 2g / L. The mass ratio of water to hides in the neutralizing solution is 15:1. The hides are taken out for washing and then the water is shaken off.

[0191] 9) Dyeing board: The dyeing board is prepared by adding the neutralized hides into the dyeing board liquid and rotating continuously at 25°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 120 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 120 minutes. The pH is adjusted to 4.0 to fix the dye on the leather board. The concentration of ammonia water is 5g / L, water is 3CC / L, active tanning agent A is 1.5g / L, leather brown dye is 1g / L, and leather red dye is 1g / L. The mass ratio of water to hide in the dyeing board liquid is 15:1.

[0192] 10) Top dyeing: The top dyeing is to add the leather after dyeing into the top dyeing liquid, and rotate continuously at 35°C. The top dyeing liquid is composed of leather yellow dye and water. After rotating for 50 minutes, add the active tanning agent B in turn and rotate for 30 minutes, then add formic acid in turn and rotate for 30 minutes, check the penetration of the leather. If the penetration of the leather is poor, add formic acid and rotate for 30 minutes. Finally, the leather is taken out, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 1g / L, the concentration of the active tanning agent B is 2cc / L, and the concentration of formic acid is 2g / L. The mass ratio of water to leather in the top dyeing liquid is 15:1;

[0193] 11) Wool washing: The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 25°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 40 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.5g / L, and the concentration of active tanning agent C is 0.5g / L.

[0194] 12) Drying: according to conventional process;

[0195] 13) Rehumidification: according to the conventional process;

[0196] 14) Dragline: Follow the conventional process;

[0197] 15) Grinding: according to conventional process;

[0198] 16) Dust removal: according to conventional process;

[0199] 17) Ironing and shearing: according to the conventional process;

[0200] 18) Dragline: Follow the conventional process;

[0201] 19) The amber finish is treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent is composed of 200 parts of aqueous water-spraying agent A and 200 parts of water by weight;

[0202] After drying, a cationic wax backing treatment is performed, which is cross-sprayed 3 times and then dried, wherein the cationic wax is composed of 200 parts of cationic hard wax, 200 parts of cationic hard casein, 50 parts of cationic polyurethane resin and 400 parts of water by weight;

[0203] Then, the primer is sprayed for 5 times, wherein the primer is composed of 35 parts of dye water, 400 parts of water, 50 parts of permeable ultrafine acrylic acid, 150 parts of soft polyurethane top light, 80 parts of high-gloss medium-hard casein, 70 parts of high-gloss wax and 70 parts of wax emulsion in parts by weight;

[0204] 20) The second primer coating is treated with a water splashing agent, sprayed crosswise once, and after drying, the primer is sprayed once. This time the primer is composed of 150 parts of soft polyurethane top light, 150 parts of water, and 20 parts of water-based hand feeling agent B by weight. The temperature is set at 120℃ / 30mpa, and the primer is sprayed once.

[0205] Example 9

[0206] A production process of sheepskin imitation amber leather comprises the following steps:

[0207] 1) Leather selection: according to conventional process;

[0208] 2) Weighing: according to the conventional process;

[0209] 3) Retanning: The selected and weighed hides are placed in a retanning solution at 30°C, wherein the retanning solution is composed of a fatliquor, formic acid, chrome powder and water, and the concentration of the fatliquor is 0.8g / L, the concentration of the formic acid is 0.8g / L, and the concentration of the chrome powder is 10g / L; the mass ratio of water to white sheepskin in the retanning solution is 10:1;

[0210] 4) Alkali extraction: Automatic alkali extractor or alkaline substances such as sodium formate, baking soda and soda ash are used to increase the pH of the retanning solution to 5, and the skins are washed with clean water after rotating for 3 hours;

[0211] 5) Peeling: according to the conventional process;

[0212] 6) Washing: Wash with clean water;

[0213] 7) Dyeing hair: put the washed hides into dyeing liquid for dyeing, rotate continuously at 68°C, add leveling agent A, rotate for 20 minutes, then add yellow dye, blue dye, and red dye, rotate for another 60 minutes, add formic acid in sequence, and then rotate for another 45 minutes before taking out the hides, the hair dyeing liquid is composed of leveling agent A, yellow dye, blue dye, red dye and water, and is used to fix the dyes on the wool, the concentration of leveling agent A is 0.5g / L, the concentration of yellow dye is 0.5g / L, the concentration of blue dye is 0.5g / L, the concentration of red dye is 0.5g / L, and the concentration of formic acid is 0.8g / L; wherein, the mass ratio of water to hides in the hair dyeing liquid is 10:1;

[0214] 8) Neutralization: The dyed hides are placed in a neutralizing solution, and the hides are placed in the neutralizing solution and rotated at 40°C, wherein sodium formate is first added and rotated for 18 minutes, and then baking soda is added and rotated for 92 minutes. The neutralizing solution is composed of sodium formate, baking soda and water, and the concentration of sodium formate is 1.5 g / L, and the concentration of baking soda is 1.5 g / L; the mass ratio of water to hides in the neutralizing solution is 10:1, and the hides are taken out for washing, and then the water is shaken off;

[0215] 9) Dyeing board: The dyeing board is prepared by adding the neutralized hides into the dyeing board liquid and rotating continuously at 22°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 60 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 60 minutes. The pH is adjusted to 3.8 to fix the dye on the leather board. The concentration of ammonia water is 3g / L, water is 2CC / L, active tanning agent A is 1.0g / L, leather brown dye is 0.8g / L, and leather red dye is 0.8g / L. The mass ratio of water to hide in the dyeing board liquid is 10:1.

[0216] 10) Top dyeing: The top dyeing is to add the leather after dyeing into the top dyeing liquid, and rotate continuously at 30°C. The top dyeing liquid is composed of leather yellow dye and water. After rotating for 40 minutes, add the active tanning agent B in turn and rotate for 40 minutes, then add formic acid in turn and rotate for 25 minutes, check the penetration of the leather. If the penetration of the leather is poor, add formic acid and rotate for 25 minutes. Finally, the leather is taken out, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 0.8g / L, the concentration of the active tanning agent B is 1.5cc / L, and the concentration of formic acid is 1.5g / L. The mass ratio of water to leather in the top dyeing liquid is 10:1;

[0217] 11) Wool washing: The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 20°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 35 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.3g / L, and the concentration of active tanning agent C is 0.3g / L.

[0218] 12) Drying: according to conventional process;

[0219] 13) Rehumidification: according to the conventional process;

[0220] 14) Dragline: Follow the conventional process;

[0221] 15) Grinding: according to conventional process;

[0222] 16) Dust removal: according to conventional process;

[0223] 17) Ironing and shearing: according to the conventional process;

[0224] 18) Dragline: Follow the conventional process;

[0225] 19) Amber finishing is treated with a water-repellent, sprayed once crosswise, and then dried, wherein the water-repellent is composed of 150 parts of aqueous water-repellent A and 150 parts of water by weight; after drying, a cationic wax backing treatment is performed, sprayed three times crosswise, and then dried, wherein the cationic wax is composed of 150 parts of cationic hard wax, 150 parts of cationic hard casein, 40 parts of cationic polyurethane resin and 300 parts of water by weight;

[0226] Then, the primer is sprayed for 5 times, wherein the primer is composed of 32 parts of dye water, 350 parts of water, 40 parts of permeable ultrafine acrylic acid, 120 parts of soft polyurethane top light, 70 parts of high-gloss medium-hard casein, 50 parts of high-gloss wax and 40 parts of wax emulsion in parts by weight;

[0227] 20) The second spray primer is treated with a water splashing agent, sprayed crosswise once, and after drying, sprayed once. This time the primer is composed of 120 parts of soft polyurethane top light, 120 parts of water, and 15 parts of water-based hand feeling agent B by weight. The temperature is set at 110℃ / 30mpa, and the primer is sprayed once.

[0228] The commodity codes and manufacturers of the raw materials used in the present invention are shown in Table 1.

[0229] Table 1 Information of raw materials used in Examples 1 to 9 of the present invention

[0230]

[0231]

[0232] Table 2 The main technical indicators of the trial-produced products have passed the test, as follows:

[0233] Table 2

[0234]

[0235] Table 3 Other test data are as follows:

[0236] The test data of decomposable harmful aromatic amine dyes are as follows:

[0237] Table 3

[0238]

[0239] Table 4 Other test data are as follows:

[0240] Table 4

[0241]

[0242]

[0243] According to QB / T1277-2012 "Determination of pH in Fur Chemical Tests",

[0244] QB / T2925-2007 Test method for color fastness of fur to sunlight,

[0245] QB / T2725-2005 "Determination of leather odor",

[0246] GB / T19941.2-2019 "Determination of formaldehyde content in leather and fur chemical tests Part 2: Spectrophotometry", GB / T19942.2-2019 "Determination of banned azo dyes in leather and fur chemical tests", GB / T1327-2019 "Test method for color fastness to leather surface friction",

[0247] QB / TI269—2012 Physical and mechanical tests on fur - Determination of tensile strength and elongation

[0248] QB / T1271—2012 Determination of shrinkage temperature of fur in physical and mechanical tests

[0249] The successful research and development of this product not only further strengthened the company's technical strength, improved the company's technical research and development level, and trained a group of technical backbones of the company, but also created good economic benefits for the company.

[0250] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. A sheepskin imitation amber leather production process, characterized in that: The following steps are involved: 1) Select, weigh, retan, remove and wash the sheepskin; The retanning process comprises placing the sheepskin rawhide after preliminary dry finishing in a retanning solution and rotating at 25 to 35° C. for retanning. The retanning solution is composed of a fatliquor, formic acid, chrome powder and water. The concentration of the fatliquor is 0.5 g / L to 1 g / L, the concentration of the formic acid is 0.1 g / L to 1 g / L, and the concentration of the chrome powder is 5 to 15 g / L. The mass ratio of water to sheepskin rawhide in the retanning solution is (5 to 15):

1. 2) dyeing the washed leather in step 1); 3) neutralizing, plate dyeing, top dyeing and wool washing the leather dyed in step 2); 4) Drying, rehydrating, shoveling, grinding, dusting, hot-shearing, shoveling, and amber coating the skins washed in step 3); The dyeing process is to put the washed hides into a hair dyeing liquid for dyeing, rotate continuously at 65-70°C, add a leveling agent A, rotate for 15-30 minutes, then add yellow dye, blue dye, and red dye, rotate for 30-60 minutes, add formic acid in sequence, and then rotate for another 15-30 minutes before taking out the hides. The hair dyeing liquid is composed of a leveling agent A, a yellow dye, a blue dye, a red dye, and water, and is used to fix the dyes on the wool. The concentration of the leveling agent A is 0.2g / L-1g / L, the concentration of the yellow dye is 0.1g / L-1g / L, the concentration of the blue dye is 0.3g / L-1g / L, the concentration of the red dye is 0.3g / L-1g / L, and the concentration of the formic acid is 0.5g / L-1g / L. The mass ratio of water to hides in the hair dyeing liquid is (5-15):

1. The neutralization is to place the hide in a neutralizing solution and rotate it at 30°C to 50°C, wherein sodium formate is first added and rotated for 15-20 minutes, and then baking soda is added and rotated for 90-95 minutes, wherein the neutralizing solution is composed of sodium formate, baking soda and water, wherein the concentration of sodium formate is 0.5 to 2 g / L, and the concentration of baking soda is 0.5 to 2 g / L; the mass ratio of water to hide in the neutralizing solution is (5 to 15): 1, the hide is removed for washing, and then the water is shaken off; The dyeing board is prepared by adding the neutralized leather into the dyeing board liquid, and continuously rotating at 20-25°C. The dyeing board liquid is composed of ammonia water, active tanning agent A, leather brown dye, leather red dye and water. Ammonia water and water are first added and rotated for 30-120 minutes, and then active tanning agent A, leather brown dye and leather red dye are added in sequence and rotated for 30-120 minutes. The pH is adjusted to 3.5-4.0 to fix the dye on the leather board. The top dyeing is to add the leather after dyeing into the top dyeing liquid, and rotate continuously at 25-35°C. The top dyeing liquid is composed of leather yellow dye, active tanning agent B, formic acid and water. After rotating for 30-50 minutes, the active tanning agent B is added in sequence and rotated for 20-30 minutes, and then formic acid is added in sequence and rotated for 20-30 minutes. The penetration of the leather is checked. If the penetration of the leather is poor, formic acid is added and rotated for 20-30 minutes. Finally, the leather is peeled, water is spun, washed, and water is spun to fix the dye on the leather board. The concentration of the leather yellow dye is 0.5g / L-1g / L, the concentration of the active tanning agent B is 1cc / L-2cc / L, and the concentration of the formic acid is 1g / L-2g / L. The mass ratio of water to leather in the top dyeing liquid is (5-15):

1. The wool washing is to add the dyed hides into a water-clearing agent, and rotate continuously at 20°C to 25°C. The water-clearing agent is composed of water, formic acid and active tanning agent C. After rotating for 30 to 40 minutes, formic acid and active tanning agent C are added in sequence to fix the dye on the hides. The concentration of formic acid is 0.1 to 0.5 g / L, and the concentration of active tanning agent C is 0.1 to 0.5 g / L. The amber finishing is treated with a water-spraying agent, sprayed once crosswise, and then dried, wherein the water-spraying agent is composed of 100-200 parts of aqueous water-spraying agent A and 100-200 parts of water by weight; after drying, a cationic wax bottom sealing treatment is carried out, sprayed 2-3 times crosswise, and then dried, wherein the cationic wax is composed of 100-200 parts of cationic hard wax, 100-200 parts of cationic hard casein, 30-50 parts of cationic polyurethane resin and 250-400 parts of water by weight; and then a primer is sprayed 4-5 times, wherein the primer is composed of 30-35 parts of dye water, 300-400 parts of water, 30-50 parts of permeable ultrafine acrylic acid, 100-150 parts of soft polyurethane top light, 60-80 parts of high-gloss medium-hard casein, 40-70 parts of high-gloss wax and 30-70 parts of wax emulsion by weight.

2. The process for producing sheepskin imitation amber leather according to claim 1, characterized in that: The method also includes a second primer spraying step, wherein the second primer spraying step is treated with a water splashing agent, sprayed crosswise once, and then dried, and then the second primer is sprayed once. The second primer is composed of 100-150 parts of soft polyurethane top light, 100-150 parts of water, and 10-20 parts of water-based hand feeling agent by weight. The temperature is set at 100°C / 30mpa-120°C / 30mpa, and the second primer is sprayed once.

3. The process for producing sheepskin imitation amber leather according to claim 2, characterized in that: The step 1) also includes conventional alkali extraction process for the hides, using an automatic alkali extractor or sodium formate or baking soda to increase the pH of the retanning solution to 4.5-5.0, and washing the hides with clean water after rotating for 1-3 hours.

Images