Composite material of rubber and nickel-plated substrate bonded together, preparation method thereof, and automotive material

Abstract

The present invention provides a composite material bonded to a rubber-plated substrate, a preparation method thereof, and an automotive material. The composite material comprises, from bottom to top, a nickel-plated substrate layer, a coupling agent layer, a first primer layer, a second primer layer, and a rubber layer stacked in sequence. The first primer layer comprises a combination of a titanate and a first silicone resin; the second primer layer comprises a combination of an acrylate and a second silicone resin. The composite material bonded to a rubber-plated substrate provided by the present invention exhibits excellent bonding and corrosion resistance and can be widely used in the field of bonding rubber to nickel-plated metals.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber and nickel-plated substrate bonding materials, and particularly relates to a composite material of rubber and nickel-plated substrate bonding, a preparation method thereof, and an automotive material. Background Art

[0002] Rubber-to-metal bonding materials are widely used in numerous fields, such as automotive manufacturing, machinery manufacturing, and construction materials. The bond strength between rubber and metal substrates has a crucial impact on product performance. The lifespan of metal-to-rubber components depends largely on the quality of the bond between the two materials. However, due to the significant differences in the structural and chemical properties of rubber and metal substrates, chemical bonds are difficult to form, and physical adsorption is weak, resulting in poor bonding strength and corrosion resistance.

[0003] Currently, researchers generally use the following methods to enhance the bonding ability of two materials, such as increasing the surface area and electrostatic adsorption of the bonding surface or improving the chemical interaction between the bonding materials. CN104371629A discloses a rubber-to-metal adhesive that exhibits excellent bonding properties, increases the shock absorption and wear resistance of the rubber, and is easy to use. However, the raw materials used for this rubber-to-metal adhesive are complex and the preparation is cumbersome.

[0004] Therefore, in this field, there is an urgent need to develop a bonding material for rubber and metal substrates that can overcome the above problems. Summary of the Invention

[0005] To address the shortcomings of the prior art, the present invention provides a composite material comprising rubber bonded to a nickel-plated substrate, a preparation method thereof, and an automotive material. The composite material comprising rubber bonded to a nickel-plated substrate provided by the present invention exhibits excellent bonding and corrosion resistance and can be widely used in the field of bonding rubber to nickel-plated metals.

[0006] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a composite material of rubber and a nickel-plated substrate bonded together, the composite material comprising, from bottom to top, a nickel-plated substrate layer, a coupling agent layer, a first primer layer, a second primer layer, and a rubber layer stacked in sequence;

[0008] The material of the first primer layer includes a combination of titanate and a first organic silicone resin;

[0009] The material of the second base coating layer includes a combination of acrylate and a second silicone resin.

[0010] The composite material of rubber and nickel-plated substrate bonded to each other provided by the present invention has excellent bonding properties and corrosion resistance, and can effectively improve the bonding strength and durability of the rubber-nickel-plated metal. Among them, on the one hand, the coupling agent layer reacts with the first primer layer to form a coupled first primer layer, thereby not only giving it good surface activity and weather resistance, but also improving its corrosion resistance and adhesion properties. The coupled first primer layer and the second primer layer undergo an addition reaction to obtain a polymer containing hydroxyl groups and double bonds, which can play a role in bonding. On the other hand, the coupling agent layer also undergoes a cross-linking reaction with the polymer containing hydroxyl groups and double bonds, which plays a role in improving the strength and heat resistance of the material.

[0011] Preferably, the titanate includes any one of tetrapropyl titanate, tetraethyl titanate or tetraisopropyl titanate, or a combination of at least two thereof.

[0012] Preferably, the first organic silicone resin includes any one of methyl silicone resin, methyl silicone oxane resin, methyl vinyl silicone resin, methyl phenyl silicone vinyl resin, methyl phenyl silicone ether resin or methyl phenyl silane resin, or a combination of at least two thereof.

[0013] Preferably, the refractive index of the first silicone resin is 1.3-1.7, for example, it may be 1.3, 1.4, 1.5, 1.6, 1.7, etc.

[0014] In the present invention, the refractive index of the first organic silicone resin is adjusted to make the material denser and stronger.

[0015] Preferably, the weight average molecular weight of the first silicone resin is 1000-100,000, for example, 1000, 2000, 3000, 5000, 8000, 10,000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100,000, etc.

[0016] In the present invention, the weight-average molecular weight of the first organosilicon resin is adjusted to achieve moderate material viscosity and stable chemical properties. A too low molecular weight will reduce chemical stability and corrosion resistance, while a too high molecular weight will make processing difficult and bubbles will appear during the curing process, affecting its performance.

[0017] Preferably, the mass ratio of titanate and first silicone resin in the first primer layer is (1-3):(1-3), for example, it can be 1:1, 1:2, 1:3, 2:1, 1:1, 2:3, 3:1, 3:2, etc.

[0018] In the present invention, by regulating the mass ratio of titanate and the first silicone resin, the material has good strength, temperature resistance and corrosion resistance. If the mass ratio is too low, the strength and corrosion resistance will be reduced. Otherwise, the material will become brittle, affecting the processing performance and making it difficult to shape or process.

[0019] Preferably, the acrylate includes any one of methyl acrylate, ethyl acrylate or butyl acrylate, or a combination of at least two of them.

[0020] Preferably, the second organic silicone resin includes any one of methyl silicone resin, methyl silicone oxane resin, methyl vinyl silicone resin, methyl phenyl silicone vinyl resin, methyl phenyl silicone ether resin or methyl phenyl silane resin, or a combination of at least two thereof.

[0021] Preferably, the refractive index of the second silicone resin is 1.3-1.7, for example, 1.3, 1.4, 1.5, 1.6, 1.7, etc.

[0022] In the present invention, the refractive index of the second organic silicone resin is adjusted to make the material denser and stronger.

[0023] Preferably, the weight average molecular weight of the second silicone resin is 1000-100,000, for example, 1000, 2000, 3000, 5000, 8000, 10,000, 20,000, 30,000, 40,000, 50,000, 60,000, 70,000, 80,000, 90,000, 100,000, etc.

[0024] In the present invention, the weight-average molecular weight of the second silicone resin is adjusted to achieve moderate material viscosity and stable chemical properties. A too low molecular weight will reduce chemical stability and corrosion resistance, while a too high molecular weight will make processing difficult and bubbles will appear during the curing process, affecting its performance.

[0025] Preferably, the mass ratio of the acrylate to the second silicone resin in the second primer layer is (1-3):(1-3), for example, it can be 1:1, 1:2, 1:3, 2:1, 1:1, 2:3, 3:1, 3:2, etc.

[0026] In the present invention, by regulating the mass ratio of the acrylate and the second silicone resin, the material reaction is sufficient, and the resulting composite material has good strength and corrosion resistance. If the mass ratio is too low, the strength and hardness of the material will be affected, and it will become brittle. Conversely, it will reduce the corrosion resistance of the material, affect the processing performance, and make it difficult to shape or process.

[0027] Preferably, the coupling agent layer is a silane coupling agent layer.

[0028] Preferably, the thickness of the nickel-plated substrate layer is 0.5 mm to 10 mm, for example, it can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0029] Preferably, the coupling agent layer has a thickness of 2 μm to 10 μm, for example, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, etc.

[0030] Preferably, the thickness of the first primer layer is 20 μm to 50 μm, for example, it can be 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 42 μm, 45 μm, 48 μm, 50 μm, etc.

[0031] Preferably, the thickness of the second primer layer is 20 μm to 50 μm, for example, it can be 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 42 μm, 45 μm, 48 μm, 50 μm, etc.

[0032] In the present invention, by regulating the thickness of the first primer layer and the second primer layer, the adhesion and corrosion resistance of the material are optimized. If the thickness is too low, problems such as falling off, low bonding strength and poor corrosion resistance will occur. Conversely, problems such as uneven surface and bubbles will occur.

[0033] Preferably, the thickness of the rubber layer is 0.1 mm to 10 mm, for example, it can be 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0034] In a second aspect, the present invention provides a method for preparing a composite material of rubber and a nickel-plated substrate bonded together according to the first aspect, the method comprising the following steps:

[0035] coating a coupling agent solution on the surface of the nickel-plated substrate layer to form a coupling agent layer;

[0036] coating a first primer solution on the surface of the coupling agent layer to form a first primer layer;

[0037] Applying a second primer solution on the surface of the first primer layer to form a second primer layer;

[0038] The second primer layer is bonded to the rubber and vulcanized to obtain a composite material of the rubber and the nickel-plated substrate.

[0039] Preferably, the first primer solution comprises titanate, a first organic silicone resin and a first solvent.

[0040] Preferably, the first solvent includes any one of toluene, acetone or ethyl acetate, or a combination of at least two of them.

[0041] Preferably, the solid content of the first primer solution is 15-30%, for example, 15%, 18%, 20%, 22%, 25%, 28%, 30%, etc.

[0042] In the present invention, by regulating the solid content of the first primer solution, the first primer solution is easy to apply and the prepared composite material has both good bonding strength and corrosion resistance. If the solid content is too low, the coating thickness of the material will be insufficient, affecting the use effect. Conversely, the viscosity of the material will increase, making it difficult to apply, and it will also affect the curing speed of the coating and affect production efficiency.

[0043] Preferably, the second primer solution comprises acrylate, a second silicone resin and a second solvent;

[0044] Preferably, the second solvent comprises any one of toluene, acetone or ethyl acetate or a combination of at least two thereof;

[0045] Preferably, the solid content of the second primer solution is 15-30%, for example, 15%, 18%, 20%, 22%, 25%, 28%, 30%, etc.

[0046] In the present invention, by regulating the solid content of the second primer solution, the second primer solution is easy to apply and the prepared composite material has both good bonding strength and corrosion resistance. If the solid content is too low, the coating thickness of the material will be insufficient, affecting the use effect. Conversely, the viscosity of the material will increase, making it difficult to apply, and it will also affect the curing speed of the coating and affect production efficiency.

[0047] Preferably, the vulcanization temperature is 100°C to 180°C, for example, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, etc.; the vulcanization time is 5 min to 20 min, for example, 5 min, 10 min, 15 min, 20 min, etc.

[0048] In a third aspect, the present invention provides an automotive material, comprising a composite material of the rubber according to the first aspect bonded to a nickel-plated substrate.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The present invention provides a composite material bonded to a nickel-plated substrate, which has excellent bonding properties and corrosion resistance and can effectively improve the bonding strength and durability of the rubber-nickel-plated metal. Specifically, on the one hand, a coupling agent layer reacts with a first primer layer to form a coupled first primer layer, thereby not only imparting good surface activity and weather resistance but also improving properties such as corrosion resistance and adhesion. The coupled first primer layer and the second primer layer undergo an addition reaction to obtain a polymer containing hydroxyl groups and double bonds, which can act as an adhesive. On the other hand, the coupling agent layer also undergoes a cross-linking reaction with the polymer containing hydroxyl groups and double bonds, which serves to improve the strength and heat resistance of the material.

[0051] The preparation method of the composite material of rubber and nickel-plated substrate bonded together provided by the present invention can not only meet the requirements of stability and convenience in mass production, but also improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic structural diagram of a composite material provided in Example 1, wherein the rubber is bonded to a nickel-plated substrate. DETAILED DESCRIPTION

[0053] The technical solution of the present invention is further described below with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that the embodiments are only for the purpose of helping to understand the present invention and should not be regarded as specific limitations of the present invention.

[0054] Example 1

[0055] This embodiment provides a composite material of rubber and nickel-plated substrate, such as Figure 1 As shown, the composite material includes, from bottom to top, a nickel-plated substrate layer with a thickness of 5 mm, a silane coupling agent layer with a thickness of 6 μm, a first primer layer with a thickness of 35 μm, a second primer layer with a thickness of 35 μm, and a rubber layer with a thickness of 5 mm.

[0056] The material of the first primer layer includes a combination of titanate (purchased from Nanjing Nengde New Material Technology Co., Ltd.) and methylphenyl silicone resin (purchased from Jilin Donghu Silicone Co., Ltd.), wherein the mass ratio of titanate and methylphenyl silicone resin in the first primer layer is 1:1; the material of the second primer layer includes a combination of methyl acrylate and methylphenyl silicone resin, wherein the mass ratio of methyl acrylate (purchased from Zhongshan Langma Chemical Industry Co., Ltd.) and methylphenyl silicone resin (purchased from Jilin Donghu Silicone Co., Ltd.) in the second primer layer is 1:1.

[0057] This embodiment also provides a method for preparing the composite material of the rubber and the nickel-plated substrate, which comprises the following steps:

[0058] coating a silane coupling agent solution on the surface of the nickel-plated substrate layer to form a silane coupling agent layer;

[0059] titanate, methylphenyl silicone resin and ethyl acetate are mixed to obtain a first primer solution with a solid content of 22%, and the first primer solution is applied on the surface of the coupling agent layer to form a first primer layer;

[0060] Mixing methyl acrylate, methylphenyl silicone resin and ethyl acetate to obtain a second primer solution with a solid content of 22%, and coating the second primer solution on the surface of the first primer layer to form a second primer layer;

[0061] The second primer layer was bonded to the rubber and vulcanized at 150° C. for 15 minutes to obtain a composite material of the rubber bonded to the nickel-plated substrate.

[0062] Example 2

[0063] This embodiment provides a composite material bonded to a rubber and nickel-plated substrate, the composite material comprising, from bottom to top, a nickel-plated substrate layer with a thickness of 1 mm, a silane coupling agent layer with a thickness of 2 μm, a first primer layer with a thickness of 20 μm, a second primer layer with a thickness of 20 μm, and a rubber layer with a thickness of 1 mm, which are stacked in sequence.

[0064] The material of the first primer layer includes a combination of titanate (purchased from Nanjing Nengde New Material Technology Co., Ltd.) and methylphenyl silicone resin (purchased from Jilin Donghu Silicone Co., Ltd.), wherein the mass ratio of titanate and methylphenyl silicone resin in the first primer layer is 1:1; the material of the second primer layer includes a combination of methyl acrylate (purchased from Zhongshan Langma Chemical Industry Co., Ltd.) and methylphenyl silicone resin (purchased from Jilin Donghu Silicone Co., Ltd.), wherein the mass ratio of methyl acrylate and methylphenyl silicone resin in the second primer layer is 1:1.

[0065] This embodiment also provides a method for preparing the composite material of the rubber and the nickel-plated substrate, which comprises the following steps:

[0066] coating a silane coupling agent solution on the surface of the nickel-plated substrate layer to form a silane coupling agent layer;

[0067] titanate, methylphenyl silicone resin and ethyl acetate are mixed to obtain a first primer solution with a solid content of 15%, and the first primer solution is applied on the surface of the coupling agent layer to form a first primer layer;

[0068] Mixing methyl acrylate, methylphenyl silicone resin and ethyl acetate to obtain a second primer solution with a solid content of 15%, and coating the second primer solution on the surface of the first primer layer to form a second primer layer;

[0069] The second primer layer was bonded to the rubber and vulcanized at 100° C. for 20 minutes to obtain a composite material of the rubber bonded to the nickel-plated substrate.

[0070] Example 3

[0071] This embodiment provides a composite material bonded to a rubber and nickel-plated substrate, the composite material comprising, from bottom to top, a nickel-plated substrate layer with a thickness of 10 mm, a silane coupling agent layer with a thickness of 10 μm, a first primer layer with a thickness of 50 μm, a second primer layer with a thickness of 50 μm, and a rubber layer with a thickness of 10 mm, which are stacked in sequence.

[0072] The material of the first primer layer includes a combination of titanate (purchased from Nanjing Nengde New Material Technology Co., Ltd.) and methylphenyl silicone resin (purchased from Jilin Donghu Silicone Co., Ltd.), wherein the mass ratio of titanate and methylphenyl silicone resin in the first primer layer is 1:1; the material of the second primer layer includes a combination of methyl acrylate (purchased from Zhongshan Langma Chemical Industry Co., Ltd.) and methylphenyl silicone resin (purchased from Jilin Donghu Silicone Co., Ltd.), wherein the mass ratio of methyl acrylate and methylphenyl silicone resin in the second primer layer is 1:1.

[0073] This embodiment also provides a method for preparing the composite material of the rubber and the nickel-plated substrate, which comprises the following steps:

[0074] coating a silane coupling agent solution on the surface of the nickel-plated substrate layer to form a silane coupling agent layer;

[0075] titanate, methylphenyl silicone resin and ethyl acetate are mixed to obtain a first primer solution with a solid content of 30%, and the first primer solution is applied on the surface of the coupling agent layer to form a first primer layer;

[0076] Mixing methyl acrylate, methylphenyl silicone resin and ethyl acetate to obtain a second primer solution with a solid content of 30%, and coating the second primer solution on the surface of the first primer layer to form a second primer layer;

[0077] The second primer layer was bonded to the rubber and vulcanized at 180° C. for 5 minutes to obtain a composite material of the rubber bonded to the nickel-plated substrate.

[0078] Example 4

[0079] The difference between this embodiment and embodiment 1 is that the mass ratio of titanate and methylphenyl silicone resin in the first primer layer is 1:9, and the rest is the same as embodiment 1.

[0080] Example 5

[0081] The difference between this embodiment and embodiment 1 is that the mass ratio of titanate and methylphenyl silicone resin in the first primer layer is 9:1, and the rest is the same as embodiment 1.

[0082] Example 6

[0083] The difference between this embodiment and embodiment 1 is that the mass ratio of methyl acrylate to methylphenyl silicone resin in the second primer layer is 1:9, and the other aspects are the same as those in embodiment 1.

[0084] Example 7

[0085] The difference between this embodiment and embodiment 1 is that the mass ratio of methyl acrylate to methylphenyl silicone resin in the second primer layer is 9:1, and the other aspects are the same as those in embodiment 1.

[0086] Example 8

[0087] The difference between this embodiment and embodiment 1 is that the thickness of the first primer layer and the second primer layer are both 10 μm, and the rest are the same as embodiment 1.

[0088] Example 9

[0089] The difference between this embodiment and embodiment 1 is that the thickness of the first primer layer and the second primer layer are both 60 μm, and the rest are the same as embodiment 1.

[0090] Comparative Example 1

[0091] The difference between this comparative example and Example 1 is that the composite material includes a nickel-plated substrate layer, a first primer layer, a second primer layer and a rubber layer stacked in sequence from bottom to top, that is, it does not contain a silane coupling agent layer, and the rest is the same as Example 1.

[0092] Comparative Example 2

[0093] The difference between this comparative example and Example 1 is that the composite material includes a nickel-plated substrate layer, a silane coupling agent layer, a second primer layer and a rubber layer stacked in sequence from bottom to top, that is, it does not contain a first primer layer, and the rest is the same as Example 1.

[0094] Comparative Example 3

[0095] The difference between this comparative example and Example 1 is that the composite material includes a nickel-plated substrate layer, a silane coupling agent layer, a first primer layer and a rubber layer stacked in sequence from bottom to top, that is, it does not contain a second primer layer. Other aspects are the same as Example 1.

[0096] Comparative Example 4

[0097] The difference between this comparative example and Example 1 is that the composite material includes a nickel-plated substrate layer, a second primer layer and a rubber layer stacked in sequence from bottom to top, that is, it does not contain a silane coupling agent layer and a first primer layer, and the rest is the same as Example 1.

[0098] Comparative Example 5

[0099] The difference between this comparative example and Example 1 is that the composite material includes a nickel-plated substrate layer, a first primer layer and a rubber layer stacked in sequence from bottom to top, that is, it does not contain a silane coupling agent layer and a second primer layer, and the rest is the same as Example 1.

[0100] Comparative Example 6

[0101] The difference between this comparative example and Example 1 is that the titanate in the first primer layer is replaced by an equal amount of methylphenyl silicone resin, and the rest is the same as Example 1.

[0102] Comparative Example 7

[0103] The difference between this comparative example and Example 1 is that the methyl acrylate in the second primer layer is replaced by an equal amount of methylphenyl silicone resin, and the rest is the same as Example 1.

[0104] Test conditions

[0105] The composite materials of rubber bonded to nickel-plated substrates provided in Examples 1 to 9 and Comparative Examples 1 to 7 were tested using the following test methods:

[0106] (1) Corrosion resistance (bonding strength after corrosion resistance): Finished product salt spray test for 168 hours, salt spray standard reference GB / T2423.17. Bonding strength test after the test, reference standard GB / T 11211-2009;

[0107] (2) Bond strength: Refer to GB / T 11211-2009.

[0108] The test results are shown in Table 1:

[0109] Table 1

[0110]

[0111] As can be seen from Table 1, the composite material of rubber and nickel-plated substrate provided by the present invention has excellent bonding performance and corrosion resistance, and the preparation method provided can effectively improve the bonding strength and durability of the rubber and nickel-plated substrate. In particular, when the preferred range of the present application is adopted, it can be seen from Examples 1-3 that the corrosion resistance can reach above 10.2 MPa and the bonding strength can reach above 11.3 MPa.

[0112] In Examples 4-5, the mass ratio of titanate and methylphenyl silicone resin exceeds the preferred range ((1-3): (1-3)) in this application, indicating that a composite material with good strength, temperature resistance and corrosion resistance cannot be obtained; in Examples 6-7, the mass ratio of methyl acrylate and methylphenyl silicone resin exceeds the preferred range ((1-3): (1-3)) in this application, indicating that the overall performance of the obtained composite material is poor; in Examples 8-9, the thickness of the primer layer exceeds the preferred range (20 μm to 50 μm) in this application, indicating that the bonding strength and corrosion resistance of the material will be reduced.

[0113] Comparative Examples 1-5 demonstrate that the composite materials obtained have relatively poor overall performance. Comparative Examples 6 and 7 demonstrate that the primer layer prepared using a single methylphenyl silicone resin is inferior to the specific resin combination provided by the present invention. This is due to the excellent adhesion of acrylates, which allow for excellent bonding to rubber and nickel substrates, as well as good temperature resistance. Titanates, on the other hand, offer excellent corrosion resistance, expanding the material's application range.

[0114] The applicant states that while the above-described embodiments illustrate the process of the present invention, the present invention is not limited to the above-described process steps, nor does it imply that the present invention must rely on the above-described process steps for implementation. Those skilled in the art will appreciate that any improvements to the present invention, equivalent substitutions for the raw materials used, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A composite material of rubber and nickel-plated substrate, characterized in that: The composite material comprises, from bottom to top, a nickel-plated substrate layer, a coupling agent layer, a first primer layer, a second primer layer, and a rubber layer stacked in sequence; The material of the first primer layer includes a combination of titanate and methylphenyl silicone resin; The material of the second base coating layer includes a combination of acrylate and methylphenyl silicone resin; The mass ratio of titanate and methylphenyl silicone resin in the first primer layer is (1-3):(1-3); The mass ratio of acrylate to methylphenyl silicone resin in the second primer layer is (1-3):(1-3); The coupling agent layer is a silane coupling agent layer; The thickness of the first primer layer is 20 μm to 50 μm; The thickness of the second primer layer is 20 μm to 50 μm.

2. The composite material according to claim 1, characterized in that The titanate includes any one of tetrapropyl titanate, tetraethyl titanate or tetraisopropyl titanate, or a combination of at least two of them.

3. The composite material according to claim 1, characterized in that The acrylic acid ester includes any one of methyl acrylate, ethyl acrylate or butyl acrylate, or a combination of at least two of them.

4. The composite material according to claim 1, characterized in that The thickness of the nickel-plated substrate layer is 0.5 mm to 10 mm.

5. The composite material according to claim 1, characterized in that The thickness of the coupling agent layer is 2 μm to 10 μm.

6. The composite material according to claim 1, characterized in that The thickness of the rubber layer is 0.1 mm to 10 mm.

7. A method for preparing a composite material of rubber and a nickel-plated substrate bonded together according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: coating a coupling agent solution on the surface of the nickel-plated substrate layer to form a coupling agent layer; coating a first primer solution on the surface of the coupling agent layer to form a first primer layer; Applying a second primer solution on the surface of the first primer layer to form a second primer layer; The second primer layer is bonded to the rubber and vulcanized to obtain a composite material of the rubber and the nickel-plated substrate.

8. The method according to claim 7, characterized in that The first primer solution includes titanate, methylphenyl silicone resin and a first solvent.

9. The method according to claim 8, characterized in that The first solvent includes any one of toluene, acetone or ethyl acetate, or a combination of at least two of them.

10. The method according to claim 7, characterized in that The solid content of the first primer solution is 15-30%.

11. The method according to claim 7, characterized in that The second primer solution includes acrylate, methylphenyl silicone resin and a second solvent.

12. The method according to claim 11, characterized in that The second solvent includes any one of toluene, acetone or ethyl acetate, or a combination of at least two of them.

13. The method according to claim 7, characterized in that The solid content of the second primer solution is 15-30%.

14. The method according to claim 7, wherein: The vulcanization temperature is 100° C. to 180° C., and the vulcanization time is 5 min to 20 min.

15. An automotive material, characterized in that: The automotive material comprises a composite material of the rubber according to any one of claims 1 to 6 bonded to a nickel-plated substrate.

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