Manufacturing method of waterborne polyurethane top-layer-imitated leather breathable microfiber base

Abstract

The invention belongs to the technical field of water-based synthetic leather, and particularly discloses a manufacturing method of a water-based polyurethane imitation top layer leather breathable microfiber base, which comprises the following steps: step 1, manufacturing sea-island fiber base cloth; 2, preparing compact layer resin for later use; 3, preparing a fluffy layer impregnated resin for later use; and step 4, manufacturing the waterborne polyurethane imitation top layer leather microfiber base. According to the manufacturing method of the waterborne polyurethane top-layer-imitated leather breathable microfiber base, on the premise that the environment-friendly requirement is met, the manufactured microfiber base has good breathability, the appearance and hand feeling similar to those of top-layer leather are achieved, the style is high-grade, and the microfiber base can be used for manufacturing high-grade sofa fabric soft in hand feeling and also can be used for manufacturing high-grade sofa fabric soft in hand feeling. The method is especially suitable for shoe materials, bags and the like, and provides a new choice for downstream application.

Description

Technical Field

[0001] The invention belongs to the technical field of water-based synthetic leather, and in particular relates to a method for manufacturing a water-based polyurethane top-grain leather-like breathable microfiber bass. Background Art

[0002] Synthetic leather has been widely accepted by the public because of its sustainable development and convenience for industrial mass production. Ordinary synthetic leather is made by coating cloth with base resin or directly transferring polyurethane film through release paper. It can only imitate the appearance of genuine leather. The synthetic leather made by this method does not have the cross-sectional effect of genuine leather and the feel is also greatly reduced.

[0003] The birth of microfiber synthetic leather has improved this situation, but the production environment of traditional solvent-based microfiber bass contains organic solvents such as toluene and DMF that are harmful to the human body, and its cross-section is consistent, the effect is closer to the second layer of leather, and the style and feel are relatively cheap. Although the existing water-based polyurethane microfiber has solved the environmental problem, it is still at the stage of imitating the feel and style of solvent-based microfiber, and it is difficult to balance the breathability and feel. Summary of the invention

[0004] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a method for producing a water-based polyurethane imitation first-layer leather breathable microfiber bass. Under the premise of ensuring environmental protection requirements, the produced microfiber bass has good air permeability and has an appearance and feel similar to first-layer leather, with a high-end style. The microfiber bass can be used to make high-end sofa fabrics with a soft feel, and is also particularly suitable for shoes, bags, etc., providing a new choice for downstream applications.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A method for producing a water-based polyurethane imitation top-grain leather breathable microfiber bass, the method comprising the following steps:

[0007] Step 1: Making sea island fiber base fabric

[0008] Provide indefinite island staple fibers, wherein, by weight percentage, the indefinite island staple fibers include: 30-50% sea component and 50-70% island component, and the indefinite island staple fibers are made into fixed island ultrafine fiber base fabrics for standby use after being combed, laid and needled;

[0009] Step 2: prepare dense layer resin for standby use;

[0010] Step 3: prepare the fluffy layer impregnated resin for standby use;

[0011] Step 4: Make water-based polyurethane imitation top-grain leather microfiber bass

[0012] After the dense layer resin is treated, it is roller-coated on the surface of the Dingdao microfiber base cloth and dried to prepare a composite base cloth. The composite base cloth is passed through an impregnation tank, and the fluffy layer is impregnated with resin after two immersion and two rolling impregnation treatments. The excess fluffy layer impregnation resin is scraped off with a scraper, and the base cloth is put into a coagulation tank for coagulation and water washing. It is then reduced, dyed, sanded, shaped, oiled, and softened. Finally, the breathable pores are hot-pressed by a pore roller to obtain a water-based polyurethane imitation first-layer leather microfiber bass.

[0013] Further, in step 1, the sea component is PVA or COPET;

[0014] The island component is PA6 or PET.

[0015] Furthermore, in step 2, the dense layer resin includes the following components in parts by weight: 100 parts of anionic and nonionic waterborne polyurethane, 3-5 parts of physical foaming agent, 0-50 parts of filler, 0-5 parts of color paste, 0.1-1 parts of chemical foaming agent, 0.3-3 parts of fluffing aid, and 0.2-2 parts of thickener;

[0016] In step three, the fluffy layer impregnated resin includes the following components in parts by weight: 100 parts of anionic and non-ionic water-based polyurethane, 0-500 parts of water, 0-5 parts of color paste, 0.1-1.2 parts of pH regulator, 0.3-3 parts of fluffy auxiliary agent, and 0.2-2 parts of thickener.

[0017] Furthermore, in the raw material composition of the dense layer resin and the fluffy layer impregnation resin, the anionic and nonionic waterborne polyurethanes are independently selected from any one of waterborne aromatic polyurethane resins and waterborne aliphatic polyurethane resins.

[0018] Further, the solid contents of the waterborne aromatic polyurethane resin and the waterborne aliphatic polyurethane resin are independently selected from 40-65%;

[0019] The moduli of the waterborne aromatic polyurethane resin and the waterborne aliphatic polyurethane resin are independently selected from 1.0-4.0 MPa.

[0020] Furthermore, the physical foaming agent is any one or more of an anionic surfactant foaming agent and a silicone resin polyether emulsion foam stabilizer mixed in any proportion;

[0021] The color paste is a non-ionic water-based color paste;

[0022] The pH regulator is 2-amino-2-methyl-1-propanol;

[0023] The fluffy auxiliary agent is a silicone fluffy agent.

[0024] Furthermore, the thickener is any one or more of a nonionic associative thickener, an alkali swelling thickener, and a cellulose thickener mixed in any proportion.

[0025] Furthermore, the mesh size of the filler is greater than 400 meshes.

[0026] Furthermore, the filler is any one or more of calcium carbonate, kaolin, talcum powder, and wood cellulose mixed in any proportion.

[0027] Furthermore, in step 4, the specific process of treating the dense layer resin is as follows: adjusting the viscosity of the dense layer resin to 10000-30000 cps, and then foaming it to 1.1-2.0 times by a mechanical foaming machine;

[0028] The specific process of treating the fluffy layer with resin is as follows: adjusting the viscosity of the fluffy layer with resin to 800-10000 cps.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention provides a method for producing a water-based polyurethane imitation top-grain leather breathable microfiber bass. Under the premise of ensuring environmental protection requirements, the produced microfiber bass has good air permeability because the dense layer resin is made of foamed resin.

[0031] 2. In the present invention, a process of first coating a dense layer with resin and then impregnating a fluffy layer with resin is adopted, so that the finished product has an appearance and feel similar to that of top-layer genuine leather, and has a high-end style.

[0032] 3. In the present invention, through the design of the preparation method, according to its process characteristics and the raw material composition of the dense layer resin and the fluffy layer impregnation resin, the combination of the physical foaming ratio and the chemical foaming ratio of the dense layer can be adjusted to achieve controllable bubbles and greatly improve the air permeability. At the same time, the adjustment of the impregnation layer resin can also bring about product diversification in style; it can be used to make high-end sofa fabrics with a soft feel, and is also particularly suitable for shoes, bags, etc., providing new options for downstream applications.

[0033] 4. In the present invention, by adopting the process of first coating the dense layer resin and then impregnating the fluffy layer with the impregnation resin, combined with the raw material composition of the dense layer resin and the fluffy layer impregnation resin, the interface between the formed dense layer and the fluffy layer is tightly connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1It is a structural schematic diagram of the present invention.

[0036] The reference numerals are: 1, dense layer; 2, fluffy layer, DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] like Figure 1 As shown, a method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass, the method comprising the following steps:

[0040] Step 1: Making sea island fiber base fabric

[0041] Providing indeterminate island staple fibers, wherein, by weight percentage, the indeterminate island staple fibers include: 30-50% sea component and 50-70% island component, and the indeterminate island staple fibers are made into fixed island ultrafine fiber base fabrics for standby use after being combed, laid and needled;

[0042] Among them, the sea component is PVA or COPET; the island component is PA6 or PET;

[0043] Step 2: prepare dense layer resin for standby use;

[0044] Step 3: prepare the fluffy layer impregnated resin for standby use;

[0045] In step 2 and step 3, the dense layer resin includes the following components by weight: 100 parts of anionic and nonionic waterborne polyurethane, 3-5 parts of physical foaming agent, 0-50 parts of filler, 0-5 parts of color paste, 0.1-1 parts of chemical foaming agent, 0.3-3 parts of fluffing aid, and 0.2-2 parts of thickener;

[0046] The impregnation resin of the fluffy layer includes the following components in parts by weight: 100 parts of anionic and nonionic waterborne polyurethane, 0-500 parts of water, 0-5 parts of color paste, 0.1-1.2 parts of pH regulator, 0.3-3 parts of fluffy auxiliary agent, and 0.2-2 parts of thickener;

[0047] In the raw material composition of the dense layer resin and the fluffy layer impregnation resin, the anionic and nonionic waterborne polyurethanes are independently selected from any one of waterborne aromatic polyurethane resins and waterborne aliphatic polyurethane resins; specifically, the solid content of the waterborne aromatic polyurethane resin and the waterborne aliphatic polyurethane resin are independently selected from 40-65%, and the modulus of the waterborne aromatic polyurethane resin and the waterborne aliphatic polyurethane resin are independently selected from 1.0-4.0 MPa;

[0048] Wherein, the physical foaming agent is any one or more of anionic surfactant foaming agent and silicone resin polyether emulsion foam stabilizer mixed in any proportion;

[0049] The color paste is non-ionic water-based color paste;

[0050] The pH regulator is 2-amino-2-methyl-1-propanol;

[0051] The bulking agent is a silicone bulking agent;

[0052] The thickener is any one or more of a nonionic associative thickener, an alkali swelling thickener, and a cellulose thickener mixed in any proportion;

[0053] The mesh number of the filler is greater than 400 meshes, and the filler is any one or more of calcium carbonate, kaolin, talcum powder, and wood cellulose mixed in any proportion;

[0054] Among them, the model of the chemical foaming agent is foaming agent H, and its main component is N, N-dinitrosopentamethylenetetramine;

[0055] Step 4: Make water-based polyurethane imitation top-grain leather microfiber bass

[0056] After the dense layer resin is treated, the resin is rolled onto the surface of the Dingdao ultrafine fiber base cloth, and then dried to prepare a composite base cloth. The composite base cloth is passed through an impregnation tank, and the fluffy layer impregnated with resin after two immersion and two rolling impregnation treatments is scraped off with a scraper, and then put into a coagulation tank for coagulation and water washing, and then through the processes of reduction, dyeing, sanding, shaping, oiling, and kneading, finally, the breathable pores are hot-pressed by a pore roller to obtain a water-based polyurethane imitation top-layer leather ultrafine fiber bass;

[0057] Among them, Figure 1 As shown, in the water-based polyurethane imitation top-grain leather microfiber bass, the dense layer resin forms a dense layer 1, and the fluffy layer is impregnated with resin to form a fluffy layer 2;

[0058] In step 4, the specific process of processing the dense layer resin is as follows: adjusting the viscosity of the dense layer resin to 10000-30000 cps, and then foaming it to 1.1-2.0 times by a mechanical foaming machine;

[0059] The specific process of treating the fluffy layer with resin is as follows: adjusting the viscosity of the fluffy layer with resin to 800-10000cps.

[0060] The following are specific examples. In the following examples, unless otherwise specified, all raw materials can be obtained from commercial sources.

[0061] Example 1

[0062] This embodiment provides a method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass, the method comprising the following steps:

[0063] Step 1: Making sea island fiber base fabric

[0064] PVA is used as the sea component and PA6 is used as the island component, and the indefinite island staple fiber is made in a ratio of 35% of the sea component and 65% of the island component. After combing, laying and needle punching, it is made into an indefinite island ultrafine fiber base cloth with a gram weight of about 580g / ㎡ and a thickness of about 2.10mm;

[0065] Step 2: preparing dense layer resin;

[0066] The dense layer resin includes the following raw materials in parts by weight: 100 parts of waterborne polyurethane KT7023, 3 parts of physical foaming agent, 20 parts of calcium carbonate, 2 parts of color paste, 0.5 parts of fluffing agent, 0.3 parts of chemical foaming agent, and 0.5 parts of thickener. The viscosity of the dense layer resin needs to be adjusted to 15000cps, and then foamed to 1.30 times by a mechanical foaming machine before use;

[0067] Step 3: preparing the fluffy layer impregnated with resin;

[0068] The fluffy layer impregnated resin includes the following raw materials in parts by weight: 100 parts of waterborne polyurethane KT702D, 300 parts of water, 2 parts of color paste, 1 part of pH regulator, 2 parts of fluffy aid, 0.8 parts of thickener, and the viscosity of the fluffy layer resin needs to be adjusted to 1500cps;

[0069] Step 4: Roll the resin of step 2 onto the surface of the base fabric of step 1, 30 mesh reverse roll coating, speed ratio 4:1, and dry and foam at a speed of 12m / min; then pass the base fabric through an impregnation tank, dip and roll twice to impregnate the impregnated resin of step 3, at a speed of 8m / min, scrape off excess slurry with a scraper, put it into a coagulation tank for coagulation, wash it with water, and then reduce it with hot water, dye it, sand it, dry it, apply oil, and soften it, and then hot press it with a pore roller (temperature 150°C, speed 12M / min) to obtain a breathable microfiber bass for imitation top-layer sofas.

[0070] Example 2

[0071] This embodiment provides a method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass, the method comprising the following steps:

[0072] Step 1: Make the island fiber base fabric, using COPET as the sea component and PA6 as the island component, with the ratio of sea component: 40% and island component: 60% to make the indefinite island staple fiber, and after combing, laying and needle punching, make the indefinite island ultrafine fiber base fabric with a gram weight of about 520g / ㎡ and a thickness of about 1.90mm;

[0073] Step 2: Prepare dense layer resin, water-based polyurethane KT636: 100 parts, foaming agent: 4 parts, calcium carbonate: 30 parts, color paste: 0.5 parts, fluffing agent: 0.8 parts, chemical foaming agent: 0.2 parts, thickener: 0.4 parts, the viscosity of the dense layer resin needs to be adjusted to 12500cps, and then foamed to 1.5 times by a mechanical foaming machine before use;

[0074] Step 3: Prepare the impregnation resin for the fluffy layer, including 100 parts of water-based polyurethane KT602K, 400 parts of water, 1.0 parts of color paste, 1.2 parts of pH adjuster, 2 parts of fluffy aid, and 1.30 parts of thickener. The viscosity of the fluffy layer resin needs to be adjusted to 2000cps.

[0075] Step 4: Roll-coat the resin of step 2 on the surface of the base fabric of step 1, 30 mesh reverse roll coating, speed ratio 4:1, and dry at a speed of 13m / min; then pass the base fabric through an impregnation tank, dip and roll twice to impregnate the impregnated resin of step 3, at a speed of 9m / min, scrape off excess slurry with a scraper, put it into a coagulation tank for coagulation, wash it with water, and then reduce it with alkali, dye it, sand it, dry it, and apply oil to obtain a breathable microfiber bass for imitation first-layer luggage.

[0076] Example 3

[0077] This embodiment provides a method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass, the method comprising the following steps:

[0078] Step 1: Make the island fiber base fabric, using PVA as the sea component and PET as the island component, with the ratio of 30% sea component and 70% island component to make the indefinite island staple fiber, and after combing, laying and needle punching, make the indefinite island ultrafine fiber base fabric with a gram weight of about 620g / ㎡ and a thickness of about 2.30mm;

[0079] Step 2: Prepare dense layer resin, water-based polyurethane KT6022: 100 parts, foaming agent: 3 parts, calcium carbonate: 10 parts, color paste: 0.3 parts, fluffing agent: 0.6 parts, chemical foaming agent: 0.1 parts, thickener: 0.8 parts, the viscosity of the dense layer resin needs to be adjusted to 17000cps, and then foamed to 1.2 times by a mechanical foaming machine before use;

[0080] Step 3: Prepare the impregnation resin for the fluffy layer, including 100 parts of water-based polyurethane KT636, 280 parts of water, 0.5 parts of color paste, 0.9 parts of PH regulator, 1.2 parts of fluffy aid, and 1.5 parts of thickener. The viscosity of the fluffy layer resin needs to be adjusted to 2500cps.

[0081] Step 4: Roll the resin of step 2 onto the surface of the base fabric of step 1, 30 mesh reverse roll coating, speed ratio 8:1, and dry at a speed of 10m / min; then pass the base fabric through an impregnation tank, dip and roll twice to impregnate the impregnated resin of step 3, at a speed of 7.5m / min, scrape off excess slurry with a scraper, put it into a coagulation tank for coagulation, wash it with water, and then reduce it with hot water, dye it, sand it, dry it, apply oil, soften it, and then hot press it with a pore roller (temperature 150°C, speed 12M / min) to obtain a breathable microfiber bass for imitation first-layer shoe uppers.

[0082] Example 4

[0083] This embodiment provides a method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass, the method comprising the following steps:

[0084] Step 1: Make the island fiber base fabric, using PVA as the sea component and PA6 as the island component, with the ratio of sea component: 40% and island component: 60% to make the indefinite island staple fiber, and after combing, laying and needle punching, make the indefinite island ultrafine fiber base fabric with a gram weight of about 350g / ㎡ and a thickness of about 1.3mm;

[0085] Step 2: Prepare dense layer resin, water-based polyurethane KT658: 100 parts, foaming agent: 5 parts, color paste: 0.3 parts, fluffing agent: 1 part, chemical foaming agent: 0.8 parts, thickener: 0.8 parts, the viscosity of the dense layer resin needs to be adjusted to 20000cps, and then foamed to 1.6 times by a mechanical foaming machine before use;

[0086] Step 3: Prepare the impregnation resin for the fluffy layer, including 100 parts of water-based polyurethane KT602K, 450 parts of water, 0.1 parts of color paste, 1 part of PH regulator, 1.5 parts of fluffy aid, and 2 parts of thickener. The viscosity of the fluffy layer resin needs to be adjusted to 2500cps.

[0087] Step 4: Roll the resin of step 2 onto the surface of the base fabric of step 1, 30 mesh reverse roll coating, speed ratio 4:1, and dry at a speed of 16 m / min; then pass the base fabric through an impregnation tank, dip and roll twice to impregnate the impregnated resin of step 3, at a speed of 7.5 m / min, scrape off excess slurry with a scraper, put it into a coagulation tank for coagulation, wash it with water, and then reduce it with hot water, dye it, sand it, dry it, apply oil, soften it, and then hot press it with a pore roller (temperature 150°C, speed 15 m / min) to obtain a breathable microfiber bass for imitation first-layer clothing.

[0088] Comparative Example 1

[0089] Comparative Example 1 is a solvent-based polyurethane ultrafine fiber synthetic leather, and its production process is: the base cloth is impregnated with wet solvent-based polyurethane → coagulated with DMF aqueous solution → washed with water → reduced with toluene → dried → dyed → sanded → oiled → kneaded to obtain the solvent-based polyurethane ultrafine fiber synthetic leather.

[0090] Comparative Example 2

[0091] Comparative Example 2 is water-based polyurethane ultrafine fiber synthetic leather, and its production process is as follows: impregnating the base fabric with water-based polyurethane → high-temperature drying and coagulation → water reduction and alkali reduction → drying → peeling → dyeing → sanding → oiling → kneading to obtain the water-based polyurethane ultrafine fiber synthetic leather.

[0092] Performance Testing

[0093] The above Examples 1 to 4 and Comparative Examples 1 to 2 were tested by the following test items:

[0094] Air permeability determination (according to QB / T 5156-2017 Test method for air permeability of artificial leather and synthetic leather).

[0095] Table 1 Performance test results of water-based polyurethane imitation top layer leather breathable microfiber bass

[0096]

[0097]

[0098] It can be seen from the results in Table 1 that the comprehensive performance of the water-based polyurethane imitation top-grain leather breathable microfiber bass prepared in Examples 1-4 is better than that of Comparative Example 1 and Comparative Example 2.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0100] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass, characterized in that: The preparation method comprises the following steps: Step 1: Making sea island fiber base fabric Provide indefinite island staple fibers, wherein, by weight percentage, the indefinite island staple fibers include: 30-50% sea component and 50-70% island component, and the indefinite island staple fibers are made into fixed island ultrafine fiber base fabrics for standby use after being combed, laid and needled; Step 2: prepare dense layer resin for standby use; Step 3: prepare the fluffy layer impregnated resin for standby use; Step 4: Make water-based polyurethane imitation top-grain leather microfiber bass After the dense layer resin is treated, it is roller-coated on the surface of the Dingdao microfiber base cloth and dried to prepare a composite base cloth. The composite base cloth is passed through an impregnation tank, and the fluffy layer is impregnated with resin after two immersion and two rolling impregnation treatments. The excess fluffy layer impregnation resin is scraped off with a scraper, and the base cloth is put into a coagulation tank for coagulation and water washing. It is then reduced, dyed, sanded, shaped, oiled, and softened. Finally, the breathable pores are hot-pressed by a pore roller to obtain a water-based polyurethane imitation first-layer leather microfiber bass.

2. The method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass according to claim 1, characterized in that: In step 1, the sea component is PVA or COPET; The island component is PA6 or PET.

3. The method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass according to claim 1, characterized in that: In step 2, the dense layer resin includes the following components by weight: 100 parts of anionic and nonionic waterborne polyurethane, 3-5 parts of physical foaming agent, 0-50 parts of filler, 0-5 parts of color paste, 0.1-1 parts of chemical foaming agent, 0.3-3 parts of fluffing aid, and 0.2-2 parts of thickener; In step three, the fluffy layer impregnated resin includes the following components in parts by weight: 100 parts of anionic and non-ionic water-based polyurethane, 0-500 parts of water, 0-5 parts of color paste, 0.1-1.2 parts of pH regulator, 0.3-3 parts of fluffy auxiliary agent, and 0.2-2 parts of thickener.

4. The method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass according to claim 3, characterized in that: In the raw material composition of the dense layer resin and the fluffy layer impregnation resin, the anionic and nonionic waterborne polyurethanes are independently selected from any one of waterborne aromatic polyurethane resins and waterborne aliphatic polyurethane resins.

5. The method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass according to claim 4, characterized in that: The solid contents of the waterborne aromatic polyurethane resin and the waterborne aliphatic polyurethane resin are independently selected from 40-65%; The moduli of the waterborne aromatic polyurethane resin and the waterborne aliphatic polyurethane resin are independently selected from 1.0-4.0 MPa.

6. The method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass according to claim 3, characterized in that: The physical foaming agent is any one or more of an anionic surfactant foaming agent and a silicone resin polyether emulsion foam stabilizer, mixed in any proportion; The color paste is a non-ionic water-based color paste; The pH regulator is 2-amino-2-methyl-1-propanol; The fluffy auxiliary agent is a silicone fluffy agent.

7. The method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass according to claim 3, characterized in that: The thickener is any one or more of a nonionic associative thickener, an alkali swelling thickener, and a cellulose thickener, mixed in any proportion.

8. The method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass according to claim 3, characterized in that: The mesh number of the filler is greater than 400 meshes.

9. The method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass according to claim 8, characterized in that: The filler is any one or more of calcium carbonate, kaolin, talcum powder and wood cellulose mixed in any proportion.

10. The method for making a water-based polyurethane imitation top-grain leather breathable microfiber bass according to claim 1, characterized in that: In step 4, the specific process of treating the dense layer resin is as follows: adjusting the viscosity of the dense layer resin to 10000-30000 cps, and then foaming it to 1.1-2.0 times by a mechanical foaming machine; The specific process of treating the fluffy layer with resin is as follows: adjusting the viscosity of the fluffy layer with resin to 800-10000 cps.

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