Artificial leather base material and preparation method thereof

Abstract

The invention relates to an artificial leather base material and a preparation method thereof, and belongs to the technical field of artificial leather. The artificial leather base material comprises a base cloth layer and a single-layer or multi-layer base body layer sequentially arranged on the base cloth layer, wherein the single-layer or multi-layer base body layer independently comprises the following components in parts by weight: 100 parts of a base material, 0.6-2 parts of a cross-linking agent and 0.2-1 part of an antioxidant; the base material is selected from one or more of a polyolefin material, a rubber material and a copolymer containing a PE chain segment; the polyolefin material is selected from polyolefin and / or polar polyolefin; the rubber material is selected from ethylene acrylate rubber and / or ethylene propylene diene monomer; the copolymer containing the PE chain segment is selected from one or more of a copolymer of nylon, polyether block polyamide and a styrene-ethylene-butylene-styrene block copolymer. The base material in the artificial leather base material is crosslinked under the action of the crosslinking agent, so that the mechanical property of the material is improved, the processing aid is less, and the odor volatility is much better.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial leather, and in particular relates to an artificial leather substrate and a preparation method thereof. Background Art

[0002] Artificial leather, a widely used alternative to leather in automotive interiors, home furnishings, clothing, and footwear, has attracted considerable attention due to its low cost and ease of processing. However, the current mainstream polyolefin-based artificial leather materials on the market, such as thermoplastic polyolefin (TPO), thermoplastic elastomer (TPE), and polyvinyl chloride (PVC), face numerous challenges that require urgent attention. These challenges significantly limit the improvement of artificial leather's performance and the expansion of its application range.

[0003] From a basic material performance perspective, materials like TPO, TPE, and PVC generally have high melting points. During processing, higher temperatures are required to achieve a plastic state, which not only increases energy consumption but can also cause the material to degrade at high temperatures, producing harmful gases and potentially posing a threat to the environment and human health. Furthermore, these materials are relatively hard, resulting in a stiff feel for the artificial leather they produce, lacking the softness and comfort of natural leather. This makes it difficult to meet consumer expectations for the tactile feel of high-quality artificial leather products. For example, in car seats and interiors, passengers experiencing prolonged contact with the hard surface of artificial leather can experience discomfort, impacting the driving experience.

[0004] Patent CN112895668A discloses a kind of TPO artificial leather without glue and manufacture method thereof, and improves the hardness and crease problem of artificial leather by using linear low density polyethylene and random polypropylene, although achieved success to a certain extent, also introduced new problem.Although the POE (polyolefin elastomer) added in this technology can reduce the hardness of material, makes it difficult to produce crease, the melting point and softening point of POE are lower. Under the high temperature environment in the car, POE without cross-linking is prone to softening and sticking phenomenon.This softening sticking not only affects the appearance and touch of artificial leather, also may cause it to adhere to other parts, affects normal use.In addition, although the addition of oil filling can improve the flexibility of material in the short term, in the long term, the separation of oil content is still inevitable, which makes the performance stability of material difficult to ensure, and cannot meet the high requirement of artificial leather product to performance stability in long-term use.

[0005] In summary, the currently mainstream polyolefin artificial leather materials and their preparation methods on the market suffer from numerous deficiencies, such as high melting point, high hardness, poor hand feel, strong odor, and insufficient performance stability. These issues severely impact the quality and performance of artificial leather products. Therefore, developing a novel artificial leather substrate and its preparation method to address these existing issues, improve the overall performance of artificial leather, and meet market demand for high-quality artificial leather products is of great practical significance and has broad application prospects. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides an artificial leather substrate and a preparation method thereof.

[0007] A first object of the present invention is to provide an artificial leather substrate comprising a base fabric layer and a single-layer or multi-layer base layer sequentially disposed on the base fabric layer, wherein the single-layer or multi-layer base layer independently comprises the following components in parts by weight: 100 parts of a base material, 0.6-2 parts of a cross-linking agent, and 0.2-1 parts of an antioxidant;

[0008] The base material is selected from one or more of polyolefin materials, rubber materials and copolymers containing PE segments;

[0009] The polyolefin material is selected from polyolefins and / or polar polyolefins;

[0010] The polyolefin is selected from one or more of polyethylene (PE), polypropylene (PP), polyolefin elastomer (POE), ethylene-butyl acrylate copolymer (EBA), ethylene-acrylic acid copolymer (EAA) and ethylene-methyl methacrylate copolymer (EMMA);

[0011] The polar polyolefin is selected from one or more of silane-grafted polyethylene (PE), silane-grafted polyolefin elastomer (POE), maleic anhydride-grafted polyethylene (PE), maleic anhydride-grafted polypropylene (PP), maleic anhydride-grafted polyolefin elastomer (POE), glycidyl methacrylate-grafted or copolymerized polyethylene (PE), glycidyl methacrylate-grafted polypropylene (PP), and glycidyl methacrylate-grafted polyolefin elastomer (POE);

[0012] The rubber material is selected from ethylene acrylate rubber (AEM) and / or ethylene propylene diene monomer rubber (EPDM);

[0013] The copolymer containing PE segments is selected from one or more of nylon copolymers, polyether block polyamide (PEBAX) and styrene-ethylene-butylene-styrene block copolymer (SEBS).

[0014] In one embodiment of the present invention, the elastic modulus of the base material is 1 MPa-1000 MPa.

[0015] In one embodiment of the present invention, the crosslinking agent is selected from one or more of triallyl isocyanurate (TAIC), triallyl cyanurate (TAC), trimethylallyl isocyanate (TMAIC), trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, pentaerythritol triacrylate, tripropylene glycol diacrylate, hexanediol diacrylate, neopentyl glycol diacrylate and dipropylene glycol diacrylate.

[0016] In one embodiment of the present invention, the antioxidant is selected from one or more of butylated hydroxyanisole, butylated hydroxytoluene, antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 245, antioxidant 618 and antioxidant B215.

[0017] In one embodiment of the present invention, a foaming layer is further provided between the multi-layer substrate layers; the foaming layer comprises the following components in parts by weight: 100 parts of base material, 1-2 parts of foaming agent, 0.2-0.6 parts of foaming aid, 0.6-2 parts of cross-linking agent and 0.2-1 parts of antioxidant; wherein the selection of base material, cross-linking agent and antioxidant is the same as that of the substrate layer.

[0018] In one embodiment of the present invention, the foaming agent is selected from one or more of azodicarbonamide, sodium bicarbonate and N,N′-dinitrosopentamethylenetetramine;

[0019] The foaming aid is selected from one or more of zinc oxide, calcium carbonate, zinc stearate and stearic acid;

[0020] The thickness of the foaming layer is 50 μm-120 μm, for example, it can be 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, 120 μm, etc.

[0021] In one embodiment of the present invention, the base fabric layer is selected from woven fabric, knitted fabric, pile fabric or non-woven fabric; and the woven fabric is selected from canvas, plain cloth or poplin.

[0022] In one embodiment of the present invention, the thickness of the base fabric layer is 0.5 mm to 1.5 mm, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0023] The total thickness of the base layer is 80μm-350μm, for example, it can be 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, 210μm, 220μm, 230μm, 240μm, 250μm, 260μm, 270μm, 280μm, 290μm, 300μm, 310μm, 320μm, 330μm, 340μm, 350μm, etc.

[0024] A second object of the present invention is to provide a method for preparing the artificial leather substrate, comprising the following steps:

[0025] S1. Evenly mix the base material, the cross-linking agent and the antioxidant to obtain a base layer material;

[0026] The base material, the foaming agent, the foaming aid, the cross-linking agent and the antioxidant are uniformly mixed to obtain a foaming layer material;

[0027] S2. According to the number of layers designed, the base layer material or the foaming layer material described in S1 is tape-casted, and during the tape-casting process, the base fabric layer is hot-applied to the base layer, and irradiated to obtain the artificial leather substrate.

[0028] In one embodiment of the present invention, in S2, the temperature of the tape casting is 100°C-200°C;

[0029] The temperature of the hot compress is 170°C-190°C, and the time is 80s-100s;

[0030] The voltage of the irradiation treatment is 380V-420V, the irradiation dosage is 20kGy-90kGy, and the line speed is 8m / min-12m / min.

[0031] The technical solution of the present invention has the following advantages over the prior art:

[0032] The polyolefin materials such as polyolefin, polar polyolefin and polyolefin elastomer, rubber material or copolymer containing PE segments in the artificial leather substrate of the present invention are subjected to EB irradiation crosslinking under the action of a crosslinking agent. The system is relatively pure and has less residual additives. At the same time, the mechanical properties of the material are improved by EB, and the processing additives are less, and the odor volatility is much better. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to specific embodiments so that those skilled in the art can better understand and implement the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. It should be understood that the specific embodiments are only used to illustrate the present invention, and the embodiments are not intended to limit the present invention.

[0034] In the present invention, unless otherwise defined, technical and scientific terms used herein have the same meanings as commonly understood by one skilled in the art to which the present invention belongs.

[0035] In the present invention, unless stated otherwise, the term "and / or" used in the present invention includes any and all combinations of one or more of the associated listed items.

[0036] In the present invention, unless otherwise stated, the experimental methods used in the examples of the present invention are conventional methods unless otherwise stated, and the materials, reagents, etc. used are all commercially available unless otherwise stated.

[0037] In the present invention, unless otherwise stated, when the terms "comprise" and / or "include" are used in the specification of the present invention, they indicate the existence of the described features, integers, steps, operations, raw materials or components, but do not exclude the existence or addition of one or more other features, integers, steps, operations, raw materials, components or their combinations.

[0038] In the present invention, unless otherwise specified, the terms "first," "second," etc., used in the present specification are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0039] In the present invention, unless otherwise specified, the crosslinking agent used in the embodiments of the present invention is trimethylolpropane trimethacrylate.

[0040] In the present invention, unless otherwise specified, the antioxidant used in the examples of the present invention is obtained by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1.

[0041] In the present invention, unless otherwise specified, the foaming aid used in the embodiments of the present invention is obtained by mixing zinc oxide and calcium carbonate in a mass ratio of 1:1.

[0042] In the present invention, unless otherwise specified, the foaming agent used in the examples of the present invention is azodicarbonamide.

[0043] In the present invention, unless otherwise specified, the base fabric layer used in the embodiments of the present invention is a woven fabric with a thickness of 0.7 mm, purchased from Jiangsu Kenan New Material Technology Co., Ltd., model number Y0061.

[0044] Example 1

[0045] The artificial leather substrate of this embodiment includes a base fabric layer and a first base layer and a second base layer sequentially arranged on one side of the base fabric layer. The thickness of the first base layer is 120 μm, and the thickness of the second base layer is 80 μm.

[0046] The first base layer and the second base layer each comprise the following components in parts by weight: 100 parts of a base material, 1.4 parts of a cross-linking agent, and 0.3 parts of an antioxidant;

[0047] The base material of the first substrate layer is ethylene acrylate rubber (AEM, purchased from DuPont, model Elastic modulus is 3MPa);

[0048] The base material of the second substrate layer is obtained by mixing olefin block copolymer (OBC, purchased from Dow, model 9507, melting point 120°C, elastic modulus 200 MPa), ethylene propylene diene monomer rubber (EPDM, purchased from SK, model 512F, elastic modulus 5 MPa), and ethylene-acrylic acid copolymer (EAA, purchased from Exxon, model 5000, elastic modulus 160 MPa) in a mass ratio of 6:3:1.

[0049] The preparation of the artificial leather substrate specifically comprises the following steps:

[0050] S1. Evenly mix the base material, the cross-linking agent, and the antioxidant to obtain a first base layer material and a second base layer material;

[0051] S2, the first base layer material and the second base layer material are tape-cast at 140°C, and during the tape-casting process, the base fabric layer is hot-applied to the first base layer, and irradiated to obtain an artificial leather substrate; wherein, the hot-applied layer is hot-applied at 180°C for 90s; the voltage of the irradiation treatment is 400V, the irradiation dose is 55kGy, and the line speed is 10m / min.

[0052] Example 2

[0053] The artificial leather substrate of this embodiment includes a base fabric layer and a first base layer and a second base layer sequentially arranged on one side of the base fabric layer. The thickness of the first base layer is 100 μm, and the thickness of the second base layer is 100 μm.

[0054] The first base layer and the second base layer each comprise the following components in parts by weight: 100 parts of a base material, 1.4 parts of a cross-linking agent, and 0.3 parts of an antioxidant;

[0055] The base material of the first substrate layer is obtained by mixing polyolefin elastomer (POE, purchased from Dow, model 8200, elastic modulus of 2.3 MPa) and ethylene-butyl acrylate copolymer (EBA, purchased from Arkema, model 28BA 175, elastic modulus of 25 MPa) in a mass ratio of 6:4;

[0056] The base material of the second substrate layer is a copolymer of nylon (Apolyha, purchased from Arkema, model LC3, elastic modulus of 55 MPa).

[0057] The preparation of the artificial leather substrate is the same as in Example 1.

[0058] Example 3

[0059] The artificial leather substrate of this embodiment includes a base fabric layer and a first base layer and a second base layer sequentially arranged on one side of the base fabric layer. The thickness of the first base layer is 150 μm, and the thickness of the second base layer is 50 μm.

[0060] The first base layer and the second base layer each comprise the following components in parts by weight: 100 parts of a base material, 1.4 parts of a cross-linking agent, and 0.3 parts of an antioxidant;

[0061] The base material of the first substrate layer is polyethylene copolymerized with glycidyl methacrylate (purchased from SK, model 8840, elastic modulus of 85 MPa);

[0062] The base material of the second substrate layer is obtained by mixing ethylene-methyl methacrylate copolymer (E mmA, purchased from Sumitomo Chemical, model WK402, elastic modulus of 15 MPa) and styrene-ethylene-butylene-styrene block copolymer (SEBS, purchased from Baling Petrochemical, model 503T, elastic modulus of 0.8 MPa) in a mass ratio of 4:6.

[0063] The preparation of the artificial leather substrate is the same as in Example 1.

[0064] Example 4

[0065] The artificial leather substrate of this embodiment includes a base fabric layer and a first base layer, a foaming layer, and a second base layer sequentially arranged on the base fabric layer. The thickness of the first base layer is 50 μm, the thickness of the foaming layer is 100 μm, and the thickness of the second base layer is 50 μm.

[0066] The first base layer and the second base layer each comprise the following components in parts by weight: 100 parts of a base material, 1.4 parts of a cross-linking agent, and 0.3 parts of an antioxidant;

[0067] The base material of the first substrate layer is ethylene-acrylic acid copolymer (EAA, purchased from Exxon, model 5000, elastic modulus of 160 MPa);

[0068] The base material of the second substrate layer is a mixture of polyolefin elastomer (POE, purchased from Dow, model 8200, elastic modulus 2.3 MPa), linear low-density polyethylene (LLDPE, purchased from Mitsui, model 1071C, elastic modulus 150 MPa) and ethylene-butyl acrylate copolymer (EBA, purchased from Arkema, model 28BA 175, elastic modulus 25 MPa) in a mass ratio of 7:1:2;

[0069] The foaming layer comprises the following components in parts by weight: 100 parts of base material, 1.5 parts of foaming agent, 0.4 parts of foaming aid, 1.4 parts of cross-linking agent and 0.3 parts of antioxidant;

[0070] The base material of the foaming layer is obtained by mixing polyolefin elastomer (POE, purchased from Dow, model 8200, elastic modulus of 2.3 MPa) and styrene-ethylene-butylene-styrene block copolymer (SEBS, purchased from Baling Petrochemical, model 503T, elastic modulus of 0.8 MPa) in a mass ratio of 7:3.

[0071] The preparation of the artificial leather substrate specifically comprises the following steps:

[0072] S1. Evenly mix the base material, the cross-linking agent, and the antioxidant to obtain a first base layer material and a second base layer material;

[0073] The base material, the foaming agent, the foaming aid, the cross-linking agent and the antioxidant are uniformly mixed to obtain a foaming layer material;

[0074] S2, the first base layer material, the foaming layer material and the second base layer material are tape-cast at 140°C, and during the tape-casting process, the base fabric layer is hot-applied to the first base layer, and irradiated to obtain an artificial leather substrate; wherein, the hot-applied layer is hot-applied at 180°C for 90s; the voltage of the irradiation treatment is 400V, the irradiation dose is 55kGy, and the line speed is 10m / min.

[0075] Example 5

[0076] The artificial leather substrate of this embodiment includes a base fabric layer and a first base layer, a foaming layer, and a second base layer sequentially arranged on the base fabric layer. The thickness of the first base layer is 40 μm, the thickness of the foaming layer is 120 μm, and the thickness of the second base layer is 40 μm.

[0077] The first base layer and the second base layer each comprise the following components in parts by weight: 100 parts of a base material, 1.4 parts of a cross-linking agent, and 0.3 parts of an antioxidant;

[0078] The base material of the first substrate layer is silane-grafted polyolefin elastomer (purchased from Coase, model R1320, elastic modulus of 3 MPa);

[0079] The base material of the second substrate layer is a mixture of polyolefin elastomer (POE, purchased from Dow, model 8200, elastic modulus of 2.3 MPa), styrene-ethylene-butylene-styrene block copolymer (SEBS, purchased from Baling Petrochemical, model 503T, elastic modulus of 0.8 MPa) and ethylene-butyl acrylate copolymer (EBA, purchased from Arkema, model 28BA 175, elastic modulus of 25 MPa) in a mass ratio of 2:5:3;

[0080] The foaming layer comprises the following components in parts by weight: 100 parts of base material, 1.5 parts of foaming agent, 0.4 parts of foaming aid, 1.4 parts of cross-linking agent and 0.3 parts of antioxidant;

[0081] The base material of the foaming layer is obtained by mixing olefin block copolymer (OBC, purchased from Dow, model 9507, melting point 120°C, elastic modulus 200 MPa), polyolefin elastomer (POE, purchased from Dow, model 8200, elastic modulus 2.3 MPa) and ethylene propylene diene monomer rubber (EPDM, purchased from SK, model 512F, elastic modulus 5 MPa) in a mass ratio of 1:6:3.

[0082] The preparation of the artificial leather substrate is the same as in Example 5.

[0083] Comparative Example 1

[0084] The method is basically the same as Example 1, except that the base material of the first substrate layer, ethylene acrylate rubber, is replaced by nylon 6 (purchased from Ascend, USA, model 21SPC, elastic modulus of 1400 MPa).

[0085] Comparative Example 2

[0086] The process is basically the same as Example 1, except that no cross-linking agent is added.

[0087] Test Example 1

[0088] The artificial leather substrates of Examples 1-5 and Comparative Examples 1-2 were subjected to relevant performance tests, and the relevant performance test methods are as follows:

[0089] (1) Warpage test: Cut the artificial leather substrate into 10cm*10cm squares, place them in an oven at 120℃ for 10min, cool them to room temperature, place the samples on a horizontal test bench, and measure the vertical distance between the highest point of the warped edge and the test bench; at the same time, compare the results of cutting the artificial leather substrate into 10cm*10cm squares, placing the samples on a horizontal test bench at room temperature, and measuring the vertical distance between the highest point of the warped edge and the test bench;

[0090] (2) Shore hardness: Shore hardness is tested in accordance with GB / T2411-2008;

[0091] (3) Bending performance: Bend the artificial leather substrate at room temperature with a bending angle of 22.5° and a bending frequency of 100,000 times to see if there are any creases on the surface.

[0092] The test results are shown in Table 1:

[0093] Table 1

[0094]

[0095]

[0096] As can be seen in Table 1, the artificial leather substrates of the examples exhibit controllable high-temperature warpage, moderate Shore hardness, and no creases after bending, demonstrating excellent dimensional stability, flexibility, and temperature resistance. This is because the polyolefin, rubber, and copolymer containing PE segments used as the base materials, combined with the crosslinking agent, form a crosslinked network with moderate elasticity, which ensures the material's flexibility while preventing excessive deformation at high temperatures.

[0097] Comparing Example 1 with Comparative Example 1 reveals that replacing ethylene acrylate rubber, the base material of the first substrate layer, with nylon 6 significantly increases the artificial leather substrate's high-temperature warpage and Shore hardness, and creases appear after bending. This is because nylon 6 is much more rigid than ethylene acrylate rubber, resulting in overall stiffness and reduced elasticity. This leads to insufficient internal stress release at high temperatures, exacerbating warping. Furthermore, rigid materials have poor bending recovery, making creases more likely to form.

[0098] Comparing Example 1 and Comparative Example 2, it can be seen that the high-temperature warpage of the artificial leather substrate deteriorates dramatically when no crosslinker is added. This is because without the addition of a crosslinker, a network structure is not formed in the system, and the molecular chain mobility is enhanced at high temperatures, leading to increased softening and deformation of the material, manifesting as a significant increase in warpage. However, since the inherent flexibility of the substrate remains unchanged, no creases are observed.

[0099] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An artificial leather substrate, characterized in that The invention comprises a base fabric layer and a single-layer or multi-layer base layer sequentially arranged on the base fabric layer, wherein the single-layer or multi-layer base layer independently comprises the following components in parts by weight: 100 parts of a base material, 0.6-2 parts of a cross-linking agent, and 0.2-1 parts of an antioxidant; The base material is selected from one or more of polyolefin materials, rubber materials and copolymers containing PE segments; The polyolefin material is selected from polyolefins and / or polar polyolefins; The polyolefin is selected from one or more of polyethylene, polypropylene, polyolefin elastomer, ethylene-butyl acrylate copolymer, ethylene-acrylic acid copolymer and ethylene-methyl methacrylate copolymer; The polar polyolefin is selected from one or more of silane-grafted polyethylene, silane-grafted polyolefin elastomer, maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, maleic anhydride-grafted polyolefin elastomer, glycidyl methacrylate-grafted or copolymerized polyethylene, glycidyl methacrylate-grafted polypropylene, and glycidyl methacrylate-grafted polyolefin elastomer; The rubber material is selected from ethylene acrylate rubber and / or EPDM rubber; The copolymer containing PE segments is selected from one or more of nylon copolymers, polyether block polyamides and styrene-ethylene-butylene-styrene block copolymers.

2. The artificial leather substrate according to claim 1, characterized in that The elastic modulus of the base material is 1 MPa-1000 MPa.

3. The artificial leather substrate according to claim 1, characterized in that The crosslinking agent is selected from one or more of triallyl isocyanurate, triallyl cyanurate, trimethallyl isocyanate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, pentaerythritol triacrylate, tripropylene glycol diacrylate, hexanediol diacrylate, neopentyl glycol diacrylate and dipropylene glycol diacrylate.

4. The artificial leather substrate according to claim 1, characterized in that The antioxidant is selected from one or more of butylated hydroxyanisole, butylated hydroxytoluene, antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 245, antioxidant 618 and antioxidant B215.

5. The artificial leather substrate according to claim 1, characterized in that A foaming layer is also provided between the multi-layer base layers; the foaming layer comprises the following components in parts by weight: 100 parts of base material, 1-2 parts of foaming agent, 0.2-0.6 parts of foaming aid, 0.6-2 parts of cross-linking agent and 0.2-1 parts of antioxidant; wherein the selection of base material, cross-linking agent and antioxidant is the same as that of the base layer.

6. The artificial leather substrate according to claim 5, characterized in that The foaming agent is selected from one or more of azodicarbonamide, sodium bicarbonate and N,N′-dinitrosopentamethylenetetramine; The foaming aid is selected from one or more of zinc oxide, calcium carbonate, zinc stearate and stearic acid; The thickness of the foaming layer is 50 μm-120 μm.

7. The artificial leather substrate according to claim 1, characterized in that The base fabric layer is selected from woven fabric, knitted fabric, raised fabric or non-woven fabric; and the woven fabric is selected from canvas, plain cloth or poplin.

8. The artificial leather substrate according to claim 1, characterized in that The thickness of the base fabric layer is 0.5mm-1.5mm; The total thickness of the base layer is 80 μm-350 μm.

9. The method for preparing an artificial leather substrate according to any one of claims 1 to 8, wherein: The following steps are involved: S1. Mixing the base material, the cross-linking agent and the antioxidant uniformly to obtain a base layer material; The base material, the foaming agent, the foaming aid, the cross-linking agent and the antioxidant are uniformly mixed to obtain a foaming layer material; S2. According to the number of layers designed, the base layer material or the foaming layer material described in S1 is tape-casted, and during the tape-casting process, the base fabric layer is hot-applied to the base layer, and irradiated to obtain the artificial leather substrate.

10. The method for preparing an artificial leather substrate according to claim 9, wherein: In S2, the temperature of the tape casting is 100° C.-200° C.; The temperature of the hot compress is 170°C-190°C, and the time is 80s-100s; The voltage of the irradiation treatment is 380V-420V, the irradiation dosage is 20kGy-90kGy, and the line speed is 8m / min-12m / min.

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