Microfiber synthetic leather and production method thereof

Abstract

The invention relates to the technical field of microfiber synthetic leather, and discloses a production method of microfiber synthetic leather, the production method of microfiber synthetic leather comprises the following steps: S1, microfibrillating: microfibrillating polyurethane and polyvinyl chloride high polymer materials by adopting a chemical or physical method, so that the microfibrillating polyurethane and polyvinyl chloride high polymer materials have tiny textures and apparent structures similar to those of natural leather; s2, on the basis of S1, coating is conducted, specifically, paper or other base materials are evenly coated with microfibrillated materials, the microfibrillated materials are combined with the base materials through heating and drying, and a base material layer is formed; s3, on the basis of S2, coating is conducted, specifically, coating treatment of polyurethane and furan resin materials is conducted on the surface of the base material, so that the performance of the materials is improved; and S4, on the basis of S3, heat transfer printing is conducted, specifically, the designed pattern is printed on the surface of the coating, and heat transfer printing paper is used for reversely transferring the pattern to the surface of the coating in a heat transfer mode. According to the invention, not only can the performance of the microfiber synthetic leather be improved, but also the probability of bubbles and infirm fitting can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-fiber synthetic leather, in particular to an ultra-fiber synthetic leather and a production method thereof. Background Art

[0002] Microfiber synthetic leather is a high-end imitation leather with many good properties. It is usually used to manufacture shoes, bags, sofas and other products. It has a texture and appearance similar to natural leather. It differs from ordinary artificial leather in that it uses microfibrillation technology and a variety of coating processes, which makes it have a texture and surface structure closer to natural leather.

[0003] Currently, most of the microfiber synthetic leathers on the market are processed through the back-end laminating technology. However, the production of microfiber synthetic leather has particularly high requirements for the back-end laminating, which is prone to problems such as bubbles and loose laminating. Therefore, we propose a microfiber synthetic leather and a production method thereof. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a microfiber synthetic leather and a production method thereof, which has the advantages of improving the performance of the microfiber synthetic leather and solves the above-mentioned problems.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of improving the performance of ultra-fine synthetic leather, the present invention provides the following technical solutions: a method for producing ultra-fine synthetic leather, the method for producing ultra-fine synthetic leather is as follows: S1, microfibrillation, specifically, microfibrillation of polymer materials such as polyurethane and polyvinyl chloride by chemical or physical methods, so that they have micro textures and surface structures similar to natural leather;

[0008] S2, on the basis of S1, coating, specifically coating the microfibrillated material evenly on paper or other substrates, and combining it with the substrate by heating and drying to form a substrate layer;

[0009] S3, based on S2, coating, specifically coating the substrate surface with materials such as polyurethane and furan resin to improve the performance of the material;

[0010] S4, based on S3, thermal transfer, specifically, printing the design pattern on the coating layer, and using thermal transfer paper to transfer the pattern to the coating surface in reverse by thermal transfer;

[0011] S5. Based on S4, sublimation printing, specifically using sublimation ink to form a printed pattern on the surface of the material to make it more decorative;

[0012] S6, on the basis of S5, leather-paper lamination, specifically, bonding the base material layer and the coating layer by hot pressing technology to form a microfiber synthetic leather material;

[0013] S7. On the basis of S6, the surface layer is processed, specifically through multiple processes such as embossing, pre-painting, painting, rolling and so on, so that the microfiber synthetic leather material has a similar surface structure and texture to natural leather.

[0014] As a preferred technical solution of the present invention, the chemical microfibrillation and physical microfibrillation in S1 are as follows:

[0015] Chemical microfibrillation: Add the polymer material to a low-volatile organic solvent, add surfactants and other auxiliary agents, and then stir or disperse them at high speed or ultrasonically, so that the polymer material is highly dispersed. Then add curing agent and cross-linking agent, and cure and cross-link under high temperature and high pressure to form a microfibrillated polymer material.

[0016] Physical microfibrillation: There are two commonly used physical microfibrillation methods: dry stretching and wet stretching. The dry stretching method is to evenly coat the polymer material on the mold surface and then mechanically stretch it to form fine textures and holes.

[0017] The wet stretching method is to add the polymer material to the wrinkled metal plate and stretch it in a solution of water and oil, so that the polymer material forms tiny textures and holes through bending and friction.

[0018] As a preferred technical solution of the present invention, the coating method in S2 is as follows: A1, preparing a coating device, a solution and a substrate;

[0019] A2. Based on A1, the diluted coating is soaked into the substrate, which can be well adsorbed;

[0020] A3, based on A2, uses air pressure or a scraper to make the liquid flow evenly, so as to obtain a more uniform film layer without bubbles;

[0021] A4, on the basis of A3, heat and dry to fully combine the substrate and the coating to form a substrate layer;

[0022] During the above coating process, the coating liquid concentration is controlled at 10-35%, and the coating ratio is: resin: curing agent: solvent = 1: 0.35-0.8: 3-6.

[0023] As a preferred technical solution of the present invention, the coating method in S3 is as follows: B1, selecting a suitable coating;

[0024] B2. Prepare the surface based on B1. Specifically, the surface needs to be smoothed or primed before coating to ensure good adhesion of the coating;

[0025] B3. Based on B2, the coating operation is to evenly apply the coating on the surface of the substrate, and form a coating with uniform thickness, not easy to crack, and uniform color by drying and curing;

[0026] In the above coating process, the coating is dried at a temperature of 78-150° C. and for a period of 9-30 minutes, and the coating is cured at a temperature of 81-200° C. and for a period of 4-60 minutes.

[0027] As a preferred technical solution of the present invention, the thermal transfer method in S4 is as follows: C1, preparing a pattern and an object to be transferred, specifically, designing a pattern to be thermally transferred and determining an object to be transferred to;

[0028] C2. Based on C1, choose a thermal transfer machine and thermal transfer paper;

[0029] C3. Based on C2, adjust the pressure and temperature of the thermal transfer machine;

[0030] C4. On the basis of C3, place the thermal transfer paper on the object to be transferred, lower the pressure of the thermal transfer machine, and the transfer time is 10-30 seconds;

[0031] C5. Based on C4, when the transfer time is up, tear off the thermal transfer paper. If it is cold-tear thermal transfer paper, it needs to be cooled for a certain period of time after transfer before tearing it off;

[0032] During the thermal transfer process, the temperature is controlled at 150-180°C and the pressure is controlled at 2-5kg / cm 2 .

[0033] As a preferred technical solution of the present invention, the sublimation printing method in S5 is as follows: D1, preparing patterns and printing materials;

[0034] D2. Based on D1, adjust the pattern size and color on the computer, then export it as a printing file and copy it to the printing device;

[0035] D3. Based on D2, a mold is made, specifically, a mold that can be transferred by sublimation ink is made by a thermal transfer mold or a CNC engraving machine;

[0036] D4. Based on D3, adjust the temperature and pressure;

[0037] D5. Based on D4, printing is performed. Specifically, the mold and printing material are placed in the printing equipment. The printer will automatically spray sublimation ink into the mold and transfer the pattern to the printing material under high temperature and high pressure.

[0038] D6. Based on D5, the processing is to place the printed material in a naturally ventilated place to dry for a period of time after the printing is completed;

[0039] During the above sublimation printing process, the temperature is controlled at 180-200°C and the pressure is controlled at 2-4kg / cm 2 .

[0040] As a preferred technical solution of the present invention, the leather-paper laminating method in S6 is as follows: E1, preparation work, specifically preparing the paper and fiber leather to be laminated, ensuring that their surfaces are clean and tidy, and cutting the paper to be laminated into the required size;

[0041] E2. On the basis of E1, apply glue, specifically, apply the special liquid glue evenly on the surface of the fiber leather, which can be applied with a brush or a roller;

[0042] E3. Based on E2, fold the fiber leather coated with glue and the cut paper together, fold them in half and align them to ensure that the two surfaces are flat and fit together;

[0043] E4, based on E3, pressing, specifically, putting the laminated paper and leather into the embossing machine, setting the pressure and time, and embossing;

[0044] E5, shaping based on E4, specifically, shaping after the lamination is completed, cutting the laminated paper and leather into the required shape;

[0045] During the above leather-paper laminating process, the pressure is controlled at 0.5-2.5 MPa, and the embossing time is controlled at 10-30 seconds.

[0046] As a preferred technical solution of the present invention, the surface layer treatment method in S7 is as follows: F1, tanning, specifically using chemical substances or plant extracts to treat the leather to make it soft, wear-resistant and waterproof;

[0047] F2: Based on F1, finishing is to treat the leather surface with paint, grease and other materials to achieve a beautifying effect;

[0048] F3, based on F2, dyeing, specifically, color treatment of leather using chemical dyes, natural plant dyes and other materials;

[0049] F4, based on F3, finishing treatment, specifically, by absorbing and reflecting light, making the leather surface have a high gloss or semi-gloss effect;

[0050] The drying and ventilation times during the above surface treatment process are: tanning drying and ventilation time ranges from 1 to 4 days, finishing drying and ventilation time ranges from 3 hours to 5 days, and dyeing drying and ventilation time ranges from 2 to 3 days.

[0051] The invention discloses a method for producing ultra-fine synthetic leather and produces ultra-fine synthetic leather.

[0052] (III) Beneficial effects

[0053] Compared with the prior art, the present invention provides a microfiber synthetic leather and a production method thereof, which have the following beneficial effects:

[0054] The ultra-fine synthetic leather and its production method produce the ultra-fine synthetic leather through the production methods of microfiberization, coating, thermal transfer, sublimation printing, leather-paper lamination and surface layer treatment. During this period, there are multiple steps for venting and lamination to reduce the probability of bubbles and loose lamination. This method can not only improve the performance of the ultra-fine synthetic leather, but also reduce the probability of bubbles and loose lamination. At the same time, the production method is simple, the manufacturing cost is low, and it is suitable for large-scale production. DETAILED DESCRIPTION

[0055] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the specification.

[0056] The present invention provides an ultra-fine synthetic leather and a production method thereof. The production method of the ultra-fine synthetic leather is as follows: S1, microfibrillation, specifically, microfibrillation of polymer materials such as polyurethane and polyvinyl chloride by chemical or physical methods to make them have micro textures and surface structures similar to natural leather;

[0057] Microfibrillation needs attention: Operating conditions: Different microfibrillation methods require different operating conditions, such as processing temperature, time, pressure, added solvents and auxiliary agents, etc. It is necessary to select according to the specific situation to ensure that the characteristics of the polymer material are not damaged during the microfibrillation process;

[0058] Solvent selection: Microfibrillation of polymer materials can be achieved by selecting appropriate solvents, such as water, organic solvents or their mixtures. It should be noted that the solvent should have good volatility and recyclability, and avoid using solvents that are harmful to the environment;

[0059] Proportion control: The proportion control of various substances such as polymer materials, solvents, surfactants, etc. is very critical and needs to be added in strict proportion to ensure the quality and performance of the materials;

[0060] Exhaust: During the microfibrillation process, bubbles and tiny particles in the polymer material and solvent need to be exhausted to ensure the quality and stability of the material. Exhaust can be done by vacuum exhaust, specifically using a mixer with a vacuum device to seal and evacuate the container. The tank with a mixing drum must also be treated with a vacuum device to remove the gas generated during mixing;

[0061] Equipment cleaning: A large amount of impurities and by-products will be generated during the microfiberization process, and the equipment needs to be cleaned in time to ensure the quality and stability of the produced microfiber synthetic leather.

[0062] S2, on the basis of S1, coating, specifically coating the microfibrillated material evenly on paper or other substrates, and combining it with the substrate by heating and drying to form a substrate layer;

[0063] S3, based on S2, coating, specifically coating the substrate surface with materials such as polyurethane and furan resin to improve the performance of the material;

[0064] S4, based on S3, thermal transfer, specifically, printing the design pattern on the coating layer, and using thermal transfer paper to transfer the pattern to the coating surface in reverse by thermal transfer;

[0065] S5. Based on S4, sublimation printing, specifically using sublimation ink to form a printed pattern on the surface of the material to make it more decorative;

[0066] S6, on the basis of S5, leather-paper lamination, specifically, bonding the base material layer and the coating layer by hot pressing technology to form a microfiber synthetic leather material;

[0067] S7. On the basis of S6, the surface layer is processed, specifically through multiple processes such as embossing, pre-painting, painting, rolling and so on, so that the microfiber synthetic leather material has a similar surface structure and texture to natural leather.

[0068] The chemical microfibrillation and physical microfibrillation in S1 are as follows:

[0069] Chemical microfibrillation: Add the polymer material to a low-volatile organic solvent, add surfactants and other auxiliary agents, and then stir or disperse them at high speed or ultrasonically, so that the polymer material is highly dispersed. Then add curing agent and cross-linking agent, and cure and cross-link under high temperature and high pressure to form a microfibrillated polymer material.

[0070] Physical microfibrillation: There are two commonly used physical microfibrillation methods: dry stretching and wet stretching. The dry stretching method is to evenly coat the polymer material on the mold surface and then mechanically stretch it to form fine textures and holes.

[0071] The wet stretching method is to add the polymer material to the wrinkled metal plate and stretch it in a solution of water and oil, so that the polymer material forms tiny textures and holes through bending and friction.

[0072] The coating method in S2 is as follows: A1, preparing coating equipment, solution and substrate;

[0073] A2. Based on A1, the diluted coating is soaked into the substrate, which can be well adsorbed;

[0074] A3, based on A2, uses air pressure or a scraper to make the liquid flow evenly, so as to obtain a more uniform film layer without bubbles;

[0075] A4, on the basis of A3, heat and dry to fully combine the substrate and the coating to form a substrate layer;

[0076] During the above coating process, the coating liquid concentration is controlled at 10-35%, and the coating ratio is: resin: curing agent: solvent = 1: 0.35-0.8: 3-6.

[0077] The coating method in S3 is as follows: B1. Select a suitable coating;

[0078] B2. Prepare the surface based on B1. Specifically, the surface needs to be smoothed or primed before coating to ensure good adhesion of the coating;

[0079] B3. Based on B2, the coating operation is to evenly apply the coating on the surface of the substrate, and form a coating with uniform thickness, not easy to crack, and uniform color by drying and curing;

[0080] In the above coating process, the coating is dried at a temperature of 78-150° C. and for a period of 9-30 minutes, and the coating is cured at a temperature of 81-200° C. and for a period of 4-60 minutes.

[0081] The thermal transfer method in S4 is as follows: C1, preparing a pattern and an object to be transferred, specifically, designing a pattern to be thermally transferred and determining an object to be transferred to;

[0082] C2. Based on C1, choose a thermal transfer machine and thermal transfer paper;

[0083] C3. Based on C2, adjust the pressure and temperature of the thermal transfer machine;

[0084] C4. On the basis of C3, place the thermal transfer paper on the object to be transferred, lower the pressure of the thermal transfer machine, and the transfer time is 10-30 seconds;

[0085] C5. Based on C4, when the transfer time is up, tear off the thermal transfer paper. If it is cold-tear thermal transfer paper, it needs to be cooled for a certain period of time after transfer before tearing it off;

[0086] During the thermal transfer process, the temperature is controlled at 150-180°C and the pressure is controlled at 2-5kg / cm 2 .

[0087] The sublimation printing method in S5 is as follows: D1, prepare the pattern and printing material;

[0088] D2. Based on D1, adjust the pattern size and color on the computer, then export it as a printing file and copy it to the printing device;

[0089] D3. Based on D2, a mold is made, specifically, a mold that can be transferred by sublimation ink is made by a thermal transfer mold or a CNC engraving machine;

[0090] D4. Based on D3, adjust the temperature and pressure;

[0091] D5. Based on D4, printing is performed. Specifically, the mold and printing material are placed in the printing equipment. The printer will automatically spray sublimation ink into the mold and transfer the pattern to the printing material under high temperature and high pressure.

[0092] D6. Based on D5, the processing is to place the printed material in a naturally ventilated place to dry for a period of time after the printing is completed;

[0093] During the above sublimation printing process, the temperature is controlled at 180-200°C and the pressure is controlled at 2-4kg / cm 2 .

[0094] The method of laminating leather and paper in S6 is as follows: E1. Preparation, specifically preparing the paper and fiber leather to be laminated, ensuring that their surfaces are clean and tidy, and cutting the paper to be laminated into the required size;

[0095] E2. On the basis of E1, apply glue, specifically, apply the special liquid glue evenly on the surface of the fiber leather, which can be applied with a brush or a roller;

[0096] E3. Based on E2, fold the fiber leather coated with glue and the cut paper together, fold them in half and align them to ensure that the two surfaces are flat and fit together;

[0097] E4, based on E3, pressing, specifically, putting the laminated paper and leather into the embossing machine, setting the pressure and time, and embossing;

[0098] E5, shaping based on E4, specifically, shaping after the lamination is completed, cutting the laminated paper and leather into the required shape;

[0099] During the above leather-paper laminating process, the pressure is controlled at 0.5-2.5 MPa, and the embossing time is controlled at 10-30 seconds.

[0100] The surface treatment methods in S7 are as follows: F1, tanning, specifically the use of chemicals or plant extracts to treat leather to make it soft, wear-resistant and waterproof;

[0101] F2: Based on F1, finishing is to treat the leather surface with paint, grease and other materials to achieve a beautifying effect;

[0102] F3, based on F2, dyeing, specifically, color treatment of leather using chemical dyes, natural plant dyes and other materials;

[0103] F4, based on F3, finishing treatment, specifically, by absorbing and reflecting light, making the leather surface have a high gloss or semi-gloss effect;

[0104] The drying and ventilation times during the above surface treatment process are: tanning drying and ventilation time ranges from 1 to 4 days, finishing drying and ventilation time ranges from 3 hours to 5 days, and dyeing drying and ventilation time ranges from 2 to 3 days.

[0105] The invention discloses a method for producing ultra-fine synthetic leather and produces ultra-fine synthetic leather.

[0106] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for producing microfiber synthetic leather, characterized in that: The production method of the ultra-fiber synthetic leather is as follows: S1, microfibrillation, specifically, microfibrillation of polyurethane and polyvinyl chloride polymer materials by chemical or physical methods, so that the materials have micro textures and surface structures similar to natural leather; S2, on the basis of S1, coating, specifically coating the microfibrillated material evenly on paper or other substrates, and combining it with the substrate by heating and drying to form a substrate layer; S3, based on S2, coating, specifically coating the substrate surface with polyurethane or furan resin to improve the performance of the material; S4, based on S3, thermal transfer, specifically, printing the design pattern on the coating layer, and using thermal transfer paper to transfer the pattern to the coating surface in reverse by thermal transfer; S5. Based on S4, sublimation printing, specifically using sublimation ink to form a printed pattern on the surface of the material to make it more decorative; S6, on the basis of S5, leather-paper lamination, specifically, bonding the base material layer and the coating layer by hot pressing technology to form a microfiber synthetic leather material; S7. On the basis of S6, the surface layer is processed, specifically through multiple processes such as embossing, pre-painting, painting and rolling, so that the microfiber synthetic leather material has a surface structure and texture similar to natural leather.

2. The method for producing ultra-fine synthetic leather according to claim 1, characterized in that: The chemical microfibrillation and physical microfibrillation in S1 are as follows: Chemical microfibrillation: Add the polymer material to a low-volatile organic solvent, add surfactants and other auxiliary agents, and then stir or disperse them at high speed or ultrasonically, so that the polymer material is highly dispersed. Then add curing agent and cross-linking agent, and cure and cross-link under high temperature and high pressure to form a microfibrillated polymer material. Physical microfibrillation: There are two commonly used physical microfibrillation methods: dry stretching and wet stretching. The dry stretching method is to evenly coat the polymer material on the mold surface and then mechanically stretch it to form fine textures and holes. The wet stretching method is to add the polymer material to the wrinkled metal plate and stretch it in a solution of water and oil, so that the polymer material forms tiny textures and holes through bending and friction.

3. The method for producing ultra-fine synthetic leather according to claim 1, characterized in that: The coating method in S2 is as follows: A1, preparing a coating device, a solution and a substrate; A2. Based on A1, the diluted coating is soaked into the substrate, which can be well adsorbed; A3, based on A2, uses air pressure or a scraper to make the liquid flow evenly, so as to obtain a more uniform film layer without bubbles; A4, on the basis of A3, heat and dry to fully combine the substrate and the coating to form a substrate layer; During the above coating process, the coating liquid concentration is controlled at 10-35%, and the coating ratio is: resin: curing agent: solvent = 1: 0.35-0.8: 3-6.

4. The method for producing ultra-fine synthetic leather according to claim 1, characterized in that: The coating method in S3 is as follows: B1, selecting a suitable coating; B2. Prepare the surface based on B1. Specifically, the surface needs to be smoothed or primed before coating to ensure good adhesion of the coating; B3. Based on B2, the coating operation is to evenly apply the coating on the surface of the substrate, and form a coating with uniform thickness, not easy to crack, and uniform color by drying and curing; In the above coating process, the coating is dried at a temperature of 78-150° C. and for a period of 9-30 minutes, and the coating is cured at a temperature of 81-200° C. and for a period of 4-60 minutes.

5. The method for producing ultra-fine synthetic leather according to claim 1, characterized in that: The thermal transfer method in S4 is as follows: C1, preparing a pattern and an object to be transferred, specifically, designing a pattern to be thermally transferred and determining an object to be transferred to; C2. Based on C1, choose a thermal transfer machine and thermal transfer paper; C3. Based on C2, adjust the pressure and temperature of the thermal transfer machine; C4. On the basis of C3, place the thermal transfer paper on the object to be transferred, lower the pressure of the thermal transfer machine, and the transfer time is 10-30 seconds; C5. Based on C4, when the transfer time is up, tear off the thermal transfer paper. If it is cold-tear thermal transfer paper, it needs to be cooled for a certain period of time after transfer before tearing it off; During the thermal transfer process, the temperature is controlled at 150-180°C and the pressure is controlled at 2-5kg / cm 2 .

6. The method for producing ultra-fine synthetic leather according to claim 1, characterized in that: The sublimation printing method in S5 is as follows: D1, preparing patterns and printing materials; D2. Based on D1, adjust the pattern size and color on the computer, then export it as a printing file and copy it to the printing device; D3. Based on D2, a mold is made, specifically, a mold that can be transferred by sublimation ink is made by a thermal transfer mold or a CNC engraving machine; D4. Based on D3, adjust the temperature and pressure; D5. Based on D4, printing is performed. Specifically, the mold and printing material are placed in the printing equipment. The printer will automatically spray sublimation ink into the mold and transfer the pattern to the printing material under high temperature and high pressure. D6. Based on D5, the processing is to place the printed material in a naturally ventilated place to dry for a period of time after the printing is completed; During the above sublimation printing process, the temperature is controlled at 180-200°C and the pressure is controlled at 2-4kg / cm 2 .

7. The method for producing ultra-fine synthetic leather according to claim 1, characterized in that: The leather-paper laminating method in S6 is as follows: E1, preparation work, specifically preparing the paper and fiber leather to be laminated, ensuring that their surfaces are clean and tidy, and cutting the paper to be laminated into the required size; E2. On the basis of E1, apply glue, specifically, apply the special liquid glue evenly on the surface of the fiber leather, which can be applied with a brush or a roller; E3. Based on E2, fold the fiber leather coated with glue and the cut paper together, fold them in half and align them to ensure that the two surfaces are flat and fit together; E4, based on E3, pressing, specifically, putting the laminated paper and leather into the embossing machine, setting the pressure and time, and embossing; E5, shaping based on E4, specifically, shaping after the lamination is completed, cutting the laminated paper and leather into the required shape; During the above leather-paper laminating process, the pressure is controlled at 0.5-2.5 MPa, and the embossing time is controlled at 10-30 seconds.

8. The method for producing ultra-fine synthetic leather according to claim 1, characterized in that: The surface treatment method in S7 is as follows: F1, tanning, specifically treating the leather with chemicals or plant extracts to make it soft, wear-resistant and waterproof; F2: Based on F1, finishing is to treat the leather surface with paint, grease or other materials to achieve a beautifying effect; F3, based on F2, dyeing, specifically, color treatment of leather using chemical dyes and natural plant dyes; F4, based on F3, finishing treatment, specifically, by absorbing and reflecting light to make the leather surface have a high gloss or semi-gloss effect; The drying and ventilation times during the above surface treatment process are: tanning drying and ventilation time ranges from 1 to 4 days, finishing drying and ventilation time ranges from 3 hours to 5 days, and dyeing drying and ventilation time ranges from 2 to 3 days.

9. A microfiber synthetic leather produced by the production method according to any one of claims 1 to 8.