Sheepskin-like artificial leather and processing technology thereof

Abstract

The present application relates to the technical field of artificial leather processing, and specifically discloses an imitation sheepskin artificial leather and its processing technology. A processing technology of an imitation sheepskin artificial leather specifically includes the following steps: preparing a PU foaming agent, coating the PU foaming agent on one side of a base fabric material, and gluing the fur on the other side; the method of coating the PU foaming agent is: rolling the PU foaming agent on the surface of the base fabric material, drying, sanding with 400 mesh, rolling for the second time, drying, sanding, spraying a finishing agent, heating at 115-120°C for 15-20min, heating at 165-170°C for 80-90s, spraying a hand feeling agent, and drying. The imitation sheepskin artificial leather obtained in the present application has higher physical properties, and the lowest wear resistance is 83mg, which improves the wear resistance of the imitation sheepskin artificial leather.

Description

Technical Field

[0001] The present application relates to the technical field of artificial leather, and more specifically, to an imitation sheepskin artificial leather and a processing technology thereof. Background Art

[0002] Artificial leather is made of textile or non-woven fabric as the base, coated with synthetic resin and various plastic additives. It is mainly divided into two categories: PVC artificial leather and PU artificial leather. The artificial leather produced with PVC resin as the raw material is PVC artificial leather, and the artificial leather produced with PU resin as the raw material is PU artificial leather. The elasticity and tensile strength of PU artificial leather are better than those of PVC artificial leather. It has a wide variety of patterns and colors, good waterproof performance, neat edges, high utilization rate, and is relatively cheaper than genuine leather. It can also prevent a large number of animals from being hunted. It is widely used in the fields of luggage, shoes, and furniture. Since sheepskin is light, thin and soft, comfortable to wear, and strong and durable, the use of PU artificial leather is more conducive to achieving the texture of sheepskin.

[0003] In the related art, the imitation wool leather made by processing with PU resin has poor wear resistance. Its inner and outer surfaces are prone to cracking and falling off after long-term use, which is difficult to meet the use requirements of the shoemaking industry. Summary of the invention

[0004] In order to improve the wear resistance of imitation sheepskin artificial leather, the present application provides an imitation sheepskin artificial leather and a processing technology thereof.

[0005] In the first aspect, the present application provides an imitation sheepskin artificial leather and a processing technology thereof, which adopts the following technical solutions:

[0006] A processing technology for imitation sheepskin artificial leather comprises the following specific steps: preparing a PU foaming agent, coating the PU foaming agent on one side of a base fabric material, and gluing a pure wool tissue layer on the other side;

[0007] Preparation of PU foaming agent: Mix the raw materials of PU foaming agent, disperse them evenly, the viscosity is 7000-8000mPa·s, inject air at 2400-2600r, stir for 8-12min, reduce the speed to 800-1000r, disperse for 15-20min, and obtain PU foaming agent;

[0008] The method for coating the PU foaming agent is specifically as follows: rolling the PU foaming agent on the surface of the base fabric material to a thickness of 1-2 cm, drying it once, grinding it with 400-mesh sandpaper, rolling it twice to a thickness of 1-2 cm, drying it twice, grinding it with 400-mesh sandpaper, spraying the finishing agent 4-5 times, drying it three times, heating it at 115-125° C. for 15-25 minutes, heating it at 165-175° C. for 80-100 seconds, spraying the hand feeling agent twice, and drying it.

[0009] By adopting the above technical scheme, a base fabric material is prepared, a PU foaming agent is coated on one side of the base fabric material, and the PU foaming agent is expanded by high temperature and polishing to form a suede surface on one side of the base fabric material, and a pure wool tissue layer is glued to the other side to obtain an imitation sheepskin artificial leather. The obtained imitation sheepskin artificial leather has a soft feel and high toughness and wear resistance.

[0010] The PU foaming agent is rolled on the surface of the woven material twice, dried and smoothed to make the leather light and soft, and to produce leather-like textures on the surface of the artificial leather to increase the leather feel. The purpose of the spraying finishing agent and thermal effect step is to use high temperature to expand the high-temperature foaming agent to form a texture similar to imitation fur, so that the other side of the wool surface of the woven material has a suede effect of sheepskin, and spray the feel agent to enhance the feel of the imitation sheepskin artificial leather.

[0011] In addition, before rolling the PU foaming agent, it is necessary to adjust the distance between the upper and lower rollers of the roller coating machine, the distance between the blades, and the thickness of the material, and the roller speed ratio of the roller coating machine is 7:3.

[0012] Preferably, the PU foaming agent comprises the following raw materials in parts by weight: 900-1100 parts of waterborne polyurethane resin, 400-600 parts of modified light calcium carbonate, 15-20 parts of foam stabilizer, 2.5-5 parts of thickener and 90-110 parts of dye paste; the modified light calcium carbonate is prepared by surface coating modification to improve the dispersion stability of light calcium carbonate in water.

[0013] The PU foaming agent raw materials of the present application are selected from 900-1100 parts of water-based polyurethane resin, 400-600 parts of modified light calcium carbonate, 15-20 parts of foam stabilizer, 2.5-5 parts of thickener and 90-110 parts of dye paste, and the imitation sheepskin artificial leather raw materials can choose any value within the respective ranges, which can improve the wear resistance of the imitation sheepskin artificial leather.

[0014] The specific method for mixing the PU foaming agent of the present application is: add water-based polyurethane resin, disperse at 800r for 15 minutes, add modified light calcium carbonate, stir and disperse at 800r for 10 minutes, add foam stabilizer, stir and disperse at 800r for 10 minutes, add thickener, stir and disperse at 800r for 10-20 minutes, and finally add dye paste, stir and disperse at 800r for 10 minutes.

[0015] By adopting the above technical scheme, water-based polyurethane resin is used for foaming in the PU foaming agent, which can give the imitation sheepskin artificial leather light and soft properties, and make the artificial leather produce leather-like textures to increase the leather feel. Light calcium carbonate is added as a filler to improve the density of the polyurethane foam layer, thereby improving the wear resistance of the imitation sheepskin artificial leather. Surface coating modification of light calcium carbonate can increase the absolute value of the surface potential of light calcium carbonate, produce a strong double-layer electrostatic repulsion effect, and on the other hand can induce a strong spatial repulsion effect, increase the wettability of the surface of light calcium carbonate to water, thereby effectively preventing light calcium carbonate from agglomerating in water and improving the dispersion stability of light calcium carbonate in water.

[0016] The addition of foam stabilizer can increase the foam viscosity and reduce the foam fluidity to have a certain foam stabilizing effect, thereby improving the uniformity of foaming inside the artificial leather and improving the feel and leather feel of the artificial leather. The thickener can make the PU foam layer have good thixotropy, increase the viscosity of the PU foam layer, and prevent the PU foam layer from sagging. The addition of dye can give the imitation wool leather different colors to meet the use needs of consumers.

[0017] Preferably, the modified light calcium carbonate is prepared by the following steps: 0.8-3.6 kg of the compound modifier is mixed with 1-3 kg of light calcium carbonate, so that the compound modifier is evenly coated on the surface of the light calcium carbonate, and then dried and dispersed to obtain the modified light calcium carbonate;

[0018] The compound modifier is a mixture of nano silicon dioxide and nano boehmite.

[0019] By adopting the above technical scheme, silicon dioxide is adsorbed on the surface of light calcium carbonate so that silicon dioxide is evenly coated on the surface of light calcium carbonate, which can induce a strong spatial repulsion effect and increase the wettability of the surface of light calcium carbonate to water, thereby effectively preventing light calcium carbonate from agglomerating in water and improving the dispersion stability of light calcium carbonate in water.

[0020] Light calcium carbonate is modified by using a composite of nano-boehmite and nano-silicon dioxide. Nano-boehmite can improve the poor thermal stability of nano-silicon dioxide. The two have a synergistic effect, which can further enhance the wear resistance of light calcium carbonate in sheepskin-like artificial leather, thereby improving the wear resistance of sheepskin-like artificial leather.

[0021] Preferably, the mass ratio of the nano-boehmite to the nano-silicon dioxide is 1:(1.5-2.5).

[0022] By adopting the above technical solution and adjusting the mass ratio of nano-boehmite to nano-silicon dioxide, the thermal stability of nano-silicon dioxide can be further improved, thereby improving the dispersion stability of modified light calcium carbonate in the PU foaming agent system, so as to further improve the wear resistance of imitation sheepskin artificial leather.

[0023] Preferably, the drying is specifically performed as follows: first drying at 50-60°C for 25-30 min, then drying at 120-130°C for 15-20 min, and finally drying at 150-160°C for 25-30 min.

[0024] By adopting the above technical solution, progressive drying is adopted during drying, which can make the PU foaming agent rolled on the surface of the woven material dry thoroughly on the one hand, and prevent the coated PU foaming agent from cracking due to direct high temperature on the other hand, thereby improving the feel of the imitation sheepskin artificial leather.

[0025] Preferably, the finishing agent comprises the following raw materials in parts by weight: 90-100 parts of high temperature resistant polyurethane foaming agent, 8-10 parts of pigment paste and 45-50 parts of water; the spray finishing agent is specifically sprayed 4-5 times and dried at 60-70°C for 20-30 minutes.

[0026] By adopting the above technical scheme, a high temperature resistant polyurethane foaming agent is sprayed, and then the polyurethane foaming agent is foamed by subsequent high temperature to generate a sheepskin-like artificial leather with a velvety feel on one side. The pigment paste can give the sheepskin-like artificial leather different colors. Multiple spraying can improve the uniformity of the coating agent on the surface of the substrate.

[0027] Preferably, the finishing agent further comprises the following raw materials in parts by weight: 5-10 parts of fine yangbuck powder and 2-3 parts of polytetrafluoroethylene powder.

[0028] By adopting the above technical solution, the fine yangbuck powder has a certain foaming effect and is smoother. Adding the fine yangbuck powder can increase the feel and velvet feel of the imitation sheepskin artificial leather, and the fine yangbuck powder has high wear resistance, which can improve the wear resistance of the imitation sheepskin artificial leather. The polytetrafluoroethylene micropowder has high stability and thus has high wear resistance. When mixed with the fine yangbuck powder, it can not only improve the wear resistance of the imitation sheepskin artificial leather, but also improve the stability of the fine yangbuck powder, thereby improving the role of the fine yangbuck powder in the finishing agent.

[0029] Preferably, the weight ratio of the polytetrafluoroethylene micropowder to the fine yangbuck powder is 1:(2-4).

[0030] By adopting the above technical solution and adjusting the weight ratio of polytetrafluoroethylene micropowder to fine yangbuck powder, the stability of fine yangbuck powder can be improved.

[0031] Preferably, the base fabric material is a base silk woven material or a tencel woven material.

[0032] By adopting the above technical solution, the base silk woven material or the tencel woven material is used as the base fabric, which has higher mechanical strength and toughness and is more suitable as the raw material of imitation sheepskin artificial leather.

[0033] In summary, the present application includes at least one of the following beneficial technical effects:

[0034] (1) The present application controls the type and dosage of each raw material to make the wear resistance of the imitation sheepskin artificial leather 88 mg, thereby improving the wear resistance of the imitation sheepskin artificial leather.

[0035] (2) The present application adjusts the drying in the step of coating the PU foaming agent to: first drying at 50°C for 30 minutes, then drying at 120°C for 20 minutes, and finally drying at 160°C for 3 minutes, so that the wear resistance of the imitation sheepskin artificial leather is 86 mg, thereby further improving the wear resistance of the imitation sheepskin artificial leather.

[0036] (3) The present application further improves the wear resistance of the imitation sheepskin artificial leather by adding polytetrafluoroethylene powder and fine sheepskin powder into the finishing agent and adjusting the weight ratio of the two so that the wear resistance of the imitation sheepskin artificial leather is 80-84 mg. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with specific embodiments.

[0038] The following raw materials in this application are all commercially available products, and are intended to make the raw materials of this application fully disclosed, and should not be understood as limiting the source of the raw materials. Specifically: water-based polyurethane resin, model 2309, effective substance content of 48±2%, silver ion, 1000-1200% elongation; light calcium carbonate, particle size 850 mesh; foam stabilizer, coconut oil fatty acid diethanolamide, effective substance content of 99%; thickener, polyacrylamide, hydrolysis degree 10-30%, dissolution time 40-60min; dye paste, khaki; nano silicon dioxide, particle size 30nm; nano boehmite, particle size 30nm; high temperature resistant polyurethane foaming agent, model MPU-8302; pigment paste, khaki; yangbuck powder, particle size 5-45μm, foaming temperature at 90-220℃, foaming ratio 40-60 times; polytetrafluoroethylene micropowder, particle size 5μm.

[0039] The following is an example of the preparation of modified light calcium carbonate:

[0040] Preparation Example 1

[0041] The modified light calcium carbonate of Preparation Example 1 is prepared by the following steps: 1 kg of nano-silicon dioxide is mixed with 1 kg of light calcium carbonate to uniformly coat the surface of the light calcium carbonate with the nano-silicon dioxide, and dried at 120° C. for 2-3 hours, crushed to 325 mesh, and obtained modified light calcium carbonate.

[0042] Preparation Example 2

[0043] The modified light calcium carbonate of Preparation Example 2 is prepared by the following steps:

[0044] 1 kg of the compound modifier is mixed with 1 kg of light calcium carbonate, the compound modifier is evenly coated on the surface of the light calcium carbonate, dried at 120°C for 2-3 hours, crushed to 325 mesh, and modified light calcium carbonate is obtained. The compound modifier is a mixture of 500 g of nano-boehmite and 500 g of nano-silicon dioxide.

[0045] Preparation Example 3-6

[0046] The difference between the preparation methods of modified light calcium carbonate in Preparation Examples 3-6 and Preparation Example 2 is that the dosages of nano-boehmite and nano-silicon dioxide in the composite modifier are 400g and 600g, 333g and 667g, 286g and 714g, and 250g and 750g, respectively, and the remaining operations are the same as in Preparation Example 2.

[0047] Example 1

[0048] The processing technology of the imitation sheepskin artificial leather of Example 1 comprises the following specific steps: preparing a PU foaming agent, coating the PU foaming agent on one side of a base fabric material, and gluing a pure wool tissue layer on the other side.

[0049] Preparation of PU foaming agent: according to the dosage in Table 1, the raw materials of PU foaming agent were mixed evenly, specifically, water-based polyurethane resin was added, dispersed at 800r for 15min, modified light calcium carbonate was added, stirred and dispersed at 800r for another 10min, foam stabilizer was added, stirred and dispersed at 800r for 10min, thickener was added, stirred and dispersed at 800r for another 15min, and finally dye paste was added, stirred and dispersed at 800r for 10min;

[0050] Coating PU foaming agent: Roll PU foaming agent on the surface of base fabric material (bottom wire woven material) with a thickness of 1.5cm, dry at 155℃ for 80min, and grind with 400-mesh sandpaper, and roll it twice with a thickness of 1.5cm, dry at 155℃ for 80min, and grind it with 400-mesh sandpaper; according to the dosage in Table 2, spray the finishing agent 5 times, dry at 65℃ for 20min, heat at 120℃ for 20min, heat at 170℃ for 90s, spray the hand feeling agent twice, and dry. The hand feeling agent is a mixture of 10g hand feeling agent 8209 and 100g water, the effective substance content of hand feeling agent 8209 is 30%, the ionicity is weak cationic, and the pH is 5-6.

[0051] Pure wool tissue layer gluing: adhesive (the adhesive is ethyl acrylate, and the effective substance content is 99%) is rolled on the other side of the base silk woven material to glue the pure wool tissue layer to obtain imitation sheepskin artificial leather.

[0052] The modified light calcium carbonate is the modified light calcium carbonate prepared in Preparation Example 1. The viscosity of the obtained PU foaming agent is 7500 mPa·s, and the foaming rate is 1.3-1.5 times. Air is introduced at 2500r, stirred for 10min, reduced to 900r, and dispersed for 18min.

[0053] Embodiment 2-6

[0054] The difference between the processing technology of the imitation sheepskin artificial leather in Example 2-6 and Example 1 is that the modified light calcium carbonate in the PU foaming agent is the modified light calcium carbonate prepared in Preparation Example 2-6, and the specific dosage is shown in Table 1.

[0055] Embodiment 7-8

[0056] The difference between the processing technology of the imitation sheepskin artificial leather of Example 7-8 and Example 4 is that the dosage of the modified light calcium carbonate in the PU foaming agent is different. The specific dosage is shown in Table 1.

[0057] Table 1 PU foaming agent raw material dosage (g)

[0058]

[0059]

[0060] Table 2 The dosage of each raw material of the coating agent (g)

[0061] Examples 1-6 Example 7 Example 8 High temperature resistant polyurethane foaming agent 100 100 100 Pigment paste 10 10 10 water 50 50 50

[0062] Example 9

[0063] The difference between the processing technology of the imitation sheepskin artificial leather in Example 9 and Example 7 is that the drying in the step of coating the PU foaming agent is specifically: first drying at 50°C for 30 minutes, then drying at 120°C for 20 minutes, and finally drying at 160°C for 3 minutes. The remaining operations are the same as in Example 7.

[0064] Examples 10-14

[0065] The difference between the processing technology of the imitation sheepskin artificial leather of Examples 10-14 and Example 9 is that the finishing agent also includes polytetrafluoroethylene powder and fine sheepskin powder, and the specific dosage is shown in Table 3.

[0066] Table 3 The dosage of each raw material of the coating agent (g)

[0067] Example 10 Embodiment 11 Example 12 Embodiment 13 Embodiment 14 High temperature resistant polyurethane foaming agent 100 100 100 100 100 Pigment paste 10 10 10 10 10 water 50 50 50 50 50 Fine Yangba Powder 5 5 9 8 10 Polytetrafluoroethylene powder 3 2.5 3 2 2

[0068] Embodiment 15

[0069] The difference between the processing technology of the imitation sheepskin artificial leather in Example 15 and that in Example 1 is that the base fabric material is a Tencel woven material, and the rest is the same as in Example 1.

[0070] Comparative Example 1

[0071] The processing technology of the imitation sheepskin artificial leather in Comparative Example 1 is different from that in Example 1 in that the method of coating the PU foaming agent is specifically as follows: the PU foaming agent raw materials are mixed evenly, rolled on the surface of the base silk woven material, dried at 155°C for 80min, smoothed with 400-mesh sandpaper, sprayed with a finishing agent 5 times, dried at 65°C for 20min, heated at 115-125°C for 15-25min, heated at 165-175°C for 80-100s, sprayed with a hand feeling agent twice, and dried. The remaining operations are the same as in Example 1.

[0072] Performance Testing

[0073] The following method was used to detect the processing technology of the imitation sheepskin artificial leather obtained in Examples 1-15 and Comparative Example 1. The specific test results are shown in Table 4.

[0074] Tensile strength: The tensile strength of imitation sheepskin leather is tested in accordance with ISO 3376-2020 "Leather physical and mechanical testing - Determination of tensile strength and elongation";

[0075] Elongation: According to DIN EN 29073-03:1992 "Textiles. Test methods for nonwovens. Part 3: Determination of breaking strength and elongation", the elongation of imitation sheepskin artificial leather at a sample width of 50 mm was tested.

[0076] Tear strength: The tear strength of imitation sheepskin leather is tested according to ISO 3377-2 2016 "Leather - Physical and mechanical tests - Determination of tearing test - Bilateral tearing";

[0077] Abrasion resistance: The abrasion resistance of imitation sheepskin artificial leather was tested according to the standard of QB / T 2780-2006 "Polyurethane artificial leather for shoe uppers".

[0078] Table 4 Performance test results of different imitation sheepskin artificial leathers

[0079]

[0080]

[0081] The test results in Table 4 show that the radial and latitudinal tensile strengths of the imitation sheepskin artificial leather obtained in the present application are 65N / 50mm and 65N / 50mm respectively, the radial and latitudinal elongations are 40% and 44% respectively, the radial and latitudinal tear strengths are 3.73kg and 3.77kg respectively, and the imitation sheepskin artificial leather has high physical properties; and the lowest abrasion resistance is 83mg, which improves the abrasion resistance of the imitation sheepskin artificial leather. In addition, the imitation sheepskin artificial leather obtained in the present application has a good feel, is relatively soft, and has the touch of leather.

[0082] In Examples 1-2, the wear resistance of the imitation sheepskin artificial leather in Example 2 is 95 mg, which is lower than that in Example 1, indicating that the modifier obtained by compounding nano-boehmite and nano-silicon dioxide can improve the wear resistance of the imitation sheepskin artificial leather, which may be related to the fact that nano-boehmite can improve the thermal stability of nano-silicon dioxide.

[0083] In Examples 2-6, the wear resistance of Examples 3-5 imitation sheepskin artificial leather is 90-93 mg, which is lower than that of Examples 2 and 6, indicating that the mass ratio of nano-boehmite to nano-silicon dioxide in the modified light calcium carbonate is 1:(1.5-2.5), which is more suitable and can improve the wear resistance of the imitation sheepskin artificial leather. This may be related to the use of nano-boehmite and nano-silicon dioxide to modify the light calcium carbonate. Nano-boehmite can improve the poor thermal stability of nano-silicon dioxide. The two have a synergistic effect, which can further improve the role of light calcium carbonate in improving the wear resistance of the imitation sheepskin artificial leather, thereby improving the wear resistance of the imitation sheepskin artificial leather.

[0084] Combining the performance test data of the imitation sheepskin artificial leather of Examples 3-5 and 7-8, it is found that the wear resistance of the imitation sheepskin artificial leather of Example 7 is 88 mg, which is lower than that of Examples 3-5 and 8, indicating that the dosage of the modified light calcium carbonate in Example 7 is more appropriate, which can improve the wear resistance of the imitation sheepskin artificial leather. This may be related to the surface coating modification of the light calcium carbonate, which can increase the absolute value of the surface potential of the light calcium carbonate and produce a strong double-layer electrostatic repulsion effect. On the other hand, it can induce a strong spatial repulsion effect, increase the wettability of the light calcium carbonate surface to water, thereby effectively preventing the light calcium carbonate from agglomerating in water, improving the dispersion stability of light calcium carbonate in water, and further improving the density of the polyurethane foaming layer, thereby improving the wear resistance of the imitation sheepskin artificial leather.

[0085] Combining the performance test data of the imitation sheepskin artificial leather of Example 9 and Example 7, it is found that the abrasion resistance of the imitation sheepskin artificial leather of Example 9 is 86 mg, which is lower than that of Example 7, indicating that the drying in the step of coating the PU foaming agent is specifically: first drying at 50°C for 30 minutes, then drying at 120°C for 20 minutes, and finally drying at 160°C for 3 minutes, which can improve the abrasion resistance of the imitation sheepskin artificial leather.

[0086] Combined with the performance test data of the imitation sheepskin artificial leather of Examples 10-14, it is found that the wear resistance of the imitation sheepskin artificial leather of Examples 11-13 is 80-84 mg, which is lower than that of Examples 10 and 14, indicating that the weight ratio of polytetrafluoroethylene micropowder to fine yangbuck powder is 1: (2-4) which is more suitable and can improve the wear resistance of the imitation sheepskin artificial leather. This may be related to the fact that the mixing of polytetrafluoroethylene micropowder and fine yangbuck powder can not only improve the wear resistance of the imitation sheepskin artificial leather, but also improve the stability of the fine yangbuck powder.

[0087] Combining the performance test data of the imitation sheepskin artificial leather of Example 15 and Example 1, it is found that the wear resistance of the imitation sheepskin artificial leather of Example 15 is not much different from that of Example 1, indicating that when the base fabric material is made of Tencel woven material, the imitation sheepskin artificial leather still has high wear resistance.

[0088] In addition, based on the performance test results of the leathers of Comparative Example 1 and Example 1, it was found that rolling the PU foaming agent twice can improve the wear resistance of the sheepskin-like artificial leather.

[0089] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A processing technology for imitation sheepskin artificial leather, characterized in that: The specific operation steps include: preparing a PU foaming agent, coating the PU foaming agent on one side of a base fabric material, and gluing a pure wool tissue layer on the other side; Preparation of PU foaming agent: Mix the raw materials of PU foaming agent, disperse them evenly, the viscosity is 7000-8000mPa·s, inject air at 2400-2600r, stir for 8-12min, reduce the speed to 800-1000r, disperse for 15-20min, and obtain PU foaming agent; The method for coating the PU foaming agent is specifically as follows: rolling the PU foaming agent on the surface of the base fabric material to a thickness of 1-2 cm, drying once, grinding with 400-mesh sandpaper, rolling twice to a thickness of 1-2 cm, drying twice, grinding with 400-mesh sandpaper, spraying the finishing agent 4-5 times, drying three times, heating at 115-125° C. for 15-25 min, heating at 165-175° C. for 80-100 s, spraying the hand feeling agent 2-3 times, and drying; The PU foaming agent comprises the following raw materials in parts by weight: 900-1100 parts of waterborne polyurethane resin, 400-600 parts of modified light calcium carbonate, 15-20 parts of foam stabilizer, 2.5-5 parts of thickener and 90-110 parts of dye paste; The modified light calcium carbonate is prepared by surface coating modification to improve the dispersion stability of light calcium carbonate in water; The modified light calcium carbonate is prepared by the following steps: 0.8-3.6 kg of a compound modifier is mixed with 1-3 kg of light calcium carbonate, so that the compound modifier is evenly coated on the surface of the light calcium carbonate, and then dried and crushed to obtain the modified light calcium carbonate; The compound modifier is a mixture of nano silicon dioxide and nano boehmite.

2. The processing technology of imitation sheepskin artificial leather according to claim 1, characterized in that: The mass ratio of the nano-boehmite to the nano-silicon dioxide is 1:(1.5-2.5).

3. The processing technology of imitation sheepskin artificial leather according to claim 1, characterized in that: The primary drying and secondary drying in the PU foaming agent coating step are specifically as follows: first drying at 50-60° C. for 25-30 min, then drying at 120-130° C. for 15-20 min, and finally drying at 150-160° C. for 2-4 min.

4. The processing technology of imitation sheepskin artificial leather according to claim 1, characterized in that: The coating agent comprises the following raw materials in parts by weight: 90-110 parts of high temperature resistant polyurethane foaming agent, 8-12 parts of pigment paste and 45-55 parts of water; the spray coating agent is specifically sprayed 4-5 times and dried at 60-70° C. for 20-30 minutes.

5. The processing technology of imitation sheepskin artificial leather according to claim 4, characterized in that: The finishing agent further comprises the following raw materials in parts by weight: 5-10 parts of fine yangbuck powder and 2-3 parts of polytetrafluoroethylene powder.

6. The processing technology of imitation sheepskin artificial leather according to claim 5, characterized in that: The weight ratio of the polytetrafluoroethylene micropowder to the fine yangbuck powder is 1:(2-4).

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