Adhesive for bonding metal and silicone rubber and method of making and use thereof

Abstract

The application provides a metal and silicone rubber bonding agent and a preparation method and application thereof, the metal and silicone rubber bonding agent comprises 25-40 wt% of a silane coupling agent, 4-8 wt% of a titanate coupling agent, 30-40 wt% of a conductive agent, 0-2.7 wt% of an additive, and the balance is a solvent; wherein the silane coupling agent comprises epoxy propyl trimethoxysilane and aminopropyl trimethoxysilane, and the mass ratio of the two is (10-18):(15-22). The metal and silicone rubber bonding agent provided by the application has the synergistic effect among the silane coupling agent, the titanate coupling agent and the conductive agent with a specific mass ratio, so that the bonding performance of the metal and the silicone rubber is improved, and the conductive performance is also enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber products, and in particular to an adhesive for bonding metal and silicone rubber, and a preparation method and application thereof. Background Art

[0002] In the power, electronics, and other related fields, bonding metal to silicone rubber is an essential process in the manufacture of complex components and equipment. However, while existing adhesives can achieve basic adhesion between metal and silicone rubber, they suffer from significant shortcomings in electrical conductivity. In power equipment manufacturing, poorly conductive adhesives result in poor electric field shielding, threatening the safe operation and service life of the equipment.

[0003] In addition, the adhesives in the prior art have insufficient adhesion when used to bond metal and silicone rubber, resulting in cracks or peeling at the bonding points when subjected to high stress or vibration, which not only reduces product reliability but also increases maintenance costs.

[0004] In view of this, this application is hereby filed. Summary of the Invention

[0005] The main purpose of the present invention is to provide an adhesive for bonding metal and silicone rubber, and its preparation method and application, so as to solve one of the problems of adhesives in the prior art when bonding metal and silicone rubber, namely, low bonding strength, poor conductivity and increased maintenance cost.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an adhesive for bonding metal and silicone rubber, wherein the adhesive for bonding metal and silicone rubber comprises 25-40 wt% of a silane coupling agent, 4-8 wt% of a titanate coupling agent, 30-40 wt% of a conductive agent, 0-2.7 wt% of an auxiliary agent, and the remainder is a solvent; wherein the silane coupling agent comprises glycidyltrimethoxysilane and aminopropyltrimethoxysilane, and the mass ratio of the two is (10-18):(15-22).

[0007] Furthermore, the titanate coupling agent includes isopropyl triisostearate titanate and isopropyl dioleate titanate, and the mass ratio of the two is (3-5): (1-3).

[0008] Furthermore, the conductive agent includes at least one of superconducting carbon black and double-walled carbon nanotubes, and further includes superconducting carbon black.

[0009] Furthermore, the solvent includes at least one of ethyl acetate, n-heptane, m-xylene, and butanone.

[0010] Furthermore, the solvent is ethyl acetate and n-heptane, and the mass ratio of the two is 1:1.5-2.

[0011] Furthermore, the auxiliary agent includes a stabilizer and a pigment and filler, and the mass ratio of the two is (1-2): (0.3-0.7).

[0012] Furthermore, the stabilizer includes at least one of bis-[γ-(carboxysilyl)propyl]tetrasulfide and bis-[γ-(carboxysilyl)propyl]disulfide.

[0013] Furthermore, the pigment filler includes at least one of phthalocyanine blue, phthalocyanine green, and iron oxide red.

[0014] Furthermore, the adhesive for bonding metal and silicone rubber includes 10-18 wt% epoxypropyltrimethoxysilane, 15-22 wt% aminopropyltrimethoxysilane, 3-5 wt% isopropyl triisostearate titanate, 1-3 wt% isopropyl dioleate titanate, 30-40 wt% superconducting carbon black, 1-2 wt% stabilizer, 0.3-0.7 wt% pigment filler, and the balance is solvent.

[0015] According to another aspect of the present invention, a method for preparing an adhesive for bonding metal and silicone rubber is provided, comprising the following steps: mixing epoxypropyltrimethoxysilane, aminopropyltrimethoxysilane, a titanate coupling agent, a conductive agent, an auxiliary agent and a solvent to obtain an adhesive for bonding metal and silicone rubber.

[0016] According to a third aspect of the present invention, there is provided an application of the adhesive for bonding metal and silicone rubber provided in the first aspect or the adhesive for bonding metal and silicone rubber obtained by the preparation method provided in the second aspect in the power industry.

[0017] Applying the technical solution of the present invention, the adhesive for bonding metal and silicone rubber provided by the present application, on the one hand, cross-links with silicone rubber through a silane coupling agent, so that a strong bonding force is formed between the adhesive and the silicone rubber; on the other hand, cross-links with the metal surface through a titanate coupling agent, so that a stable chemical bond is formed between the adhesive and the metal surface, thereby improving the bonding performance between the metal and the silicone rubber. The conductive agent gives the adhesive excellent electrical conductivity, thereby significantly enhancing the electrical conductivity between the metal and the silicone rubber. Therefore, the present application not only improves the bonding performance between the metal and the silicone rubber, but also enhances the electrical conductivity, promotes product stability, and reduces maintenance costs by utilizing the synergistic effect between the silane coupling agent, titanate coupling agent, and conductive agent in a specific mass ratio. In addition, the silane coupling agent formed by the mutual cooperation of glycidyltrimethoxysilane and aminopropyltrimethoxysilane in a specific mass ratio further enhances the bonding force between the adhesive and the silicone rubber, thereby further improving the bonding performance between the metal and the silicone rubber. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the embodiments.

[0019] As analyzed in the background technology of this application, one of the problems in the prior art is that the adhesive has low bonding strength and poor conductivity when bonding metal and silicone rubber. In order to solve this problem, this application provides an adhesive for bonding metal and silicone rubber, and its preparation method and application.

[0020] In a typical embodiment of the present application, an adhesive for bonding metal and silicone rubber is provided, which includes 25 to 40 wt% of a silane coupling agent, 4 to 8 wt% of a titanate coupling agent, 30 to 40 wt% of a conductive agent, 0 to 2.7 wt% of an auxiliary agent, and the remainder is a solvent; wherein the silane coupling agent includes epoxypropyltrimethoxysilane and aminopropyltrimethoxysilane, and the mass ratio of the two is (10 to 18): (15 to 22).

[0021] The adhesive for bonding metal and silicone rubber provided in this application, on the one hand, is cross-linked with silicone rubber by a silane coupling agent, so that a strong bonding force is formed between the adhesive and the silicone rubber; on the other hand, it is cross-linked with the metal surface by a titanate coupling agent, so that a stable chemical bond is formed between the adhesive and the metal surface, thereby improving the bonding performance between the metal and the silicone rubber. The conductive agent gives the adhesive excellent electrical conductivity, thereby significantly enhancing the electrical conductivity between the metal and the silicone rubber. Therefore, this application not only improves the bonding performance of the metal and the silicone rubber, but also enhances the electrical conductivity, promotes product stability, and reduces maintenance costs by utilizing the synergistic effect between the silane coupling agent, titanate coupling agent and conductive agent of a specific mass ratio.

[0022] Typically, but not limitatively, the content of the silane coupling agent in the adhesive for bonding metal and silicone rubber provided in the present application is 25wt%, 30wt%, 35wt%, 40wt% or a range consisting of any two values; the content of the titanate coupling agent is 4wt%, 4.5wt%, 5wt%, 6wt%, 7wt%, 8wt% or a range consisting of any two values; the content of the conductive agent is 30wt%, 33wt%, 34wt%, 36wt%, 38wt%, 40wt% or a range consisting of any two values; the content of the auxiliary agent is 0wt%, 1.3wt%, 1.5wt%, 1.8wt%, 2.2wt%, 2.7wt% or a range consisting of any two values.

[0023] Typically but not limitatively, in the silane coupling agent provided herein, the mass ratio of glycidyltrimethoxysilane to aminopropyltrimethoxysilane is 10:15, 10:22, 12:20, 14:16, 14:18, 16:16, 18:15, 18:22 or a range consisting of any two values.

[0024] In order to further improve the bonding force between the metal surface and the titanate coupling agent, so as to further improve the adhesion between the metal and the silicone rubber, the titanate coupling agent preferably includes isopropyl triisostearate titanate and isopropyl dioleate titanate, and the mass ratio of the two is (3 to 5): (1 to 3).

[0025] Typically, but not limitatively, in the titanate coupling agent provided herein, the mass ratio of isopropyl triisostearate titanate and isopropyl dioleate titanate is 3:3, 4:2, 5:1 or a range consisting of any two values.

[0026] In order to further enhance the conductive properties of the adhesive for bonding metal and silicone rubber, the conductive agent preferably includes at least one of superconducting carbon black and double-walled carbon nanotubes, and more preferably superconducting carbon black.

[0027] In some specific embodiments, the superconducting carbon black is purchased from Guangzhou Gaozhi New Materials Co., Ltd. or other agents, and the brand of the superconducting carbon black is Ketjen EC600JD.

[0028] The solvents used in this application are not specifically limited and may be any commonly used solvent in the art, including but not limited to ethyl acetate, n-heptane, m-xylene, butanone, etc. To further promote the dissolution of the components, the preferred solvents are ethyl acetate and n-heptane, with a mass ratio of 1:1.5 to 2, and more preferably a mass ratio of 1:1.8.

[0029] In some embodiments, the additives include a stabilizer and a pigment and filler, and the mass ratio of the stabilizer and the pigment and filler is (1-2): (0.3-0.7).

[0030] Typically, but not limited to, the mass ratio of stabilizer to pigment is 1:0.3, 1:0.5, 1:0.7, 1.5:0.5, 2:0.3, 2:0.7 or a range consisting of any two values.

[0031] The stabilizer in the additive contains acidic stabilizer groups, which not only improve the wettability of the conductive agent's surface groups but also provide excellent anti-settling properties. This further promotes uniform dispersion of the conductive agent in the adhesive that bonds metal and silicone rubber, and prevents precipitation of the conductive agent after the adhesive cures, further improving the adhesive's conductivity. Pigments and fillers in the additive are used to determine whether the adhesive is evenly mixed. If the adhesive is not evenly mixed, the pigments and fillers will flocculate and coarse, a phenomenon that is particularly evident under a scanning electron microscope. Observing the flocculation of the pigments and fillers under a scanning electron microscope can be used to determine whether the adhesive is evenly mixed, ensuring that the conductive agent is evenly dispersed.

[0032] In order to further promote the dispersion and stabilization of the conductive agent in the adhesive bonding the metal and the silicone rubber, the stabilizer preferably includes any one or more of bis-[γ-(carboxysilyl)propyl]tetrasulfide and bis-[γ-(carboxysilyl)propyl]disulfide.

[0033] In order to further observe the dispersion state of the conductive agent in the adhesive for bonding the metal and the silicone rubber, the pigment filler preferably includes any one or more of phthalocyanine blue, phthalocyanine green, and iron oxide red.

[0034] In some embodiments, the adhesive for bonding metal and silicone rubber includes 10-18 wt% epoxypropyltrimethoxysilane, 15-22 wt% aminopropyltrimethoxysilane, 3-5 wt% isopropyl triisostearate titanate, 1-3 wt% isopropyl dioleate titanate, 30-40 wt% superconducting carbon black, 1-2 wt% stabilizer, 0.3-0.7 wt% pigment and filler, with the balance being solvent. The various components within the above mass percentage ranges synergistically enhance the conductivity and adhesion of the adhesive for bonding metal and silicone rubber.

[0035] In another typical embodiment of the present application, a method for preparing an adhesive for bonding metals and silicone rubber provided in the above-mentioned first typical embodiment is provided, comprising the following steps: mixing epoxypropyltrimethoxysilane, aminopropyltrimethoxysilane, a titanate coupling agent, a conductive agent, an auxiliary agent and a solvent to obtain an adhesive for bonding metals and silicone rubber.

[0036] The preparation method provided in this application is simple to operate and is suitable for industrial production. The mixing method in this application is not specifically limited, and any mixing method commonly used in the art can be used, including but not limited to stirring, ultrasonic dispersion technology, etc.

[0037] In the third typical embodiment of the present application, there is provided an application of the bonding metal and silicone rubber adhesive provided by the above-mentioned first typical embodiment or the bonding metal and silicone rubber adhesive obtained by the preparation method provided by the above-mentioned second typical embodiment in the power industry, such as bonding the embedded metal parts of high-voltage quick-connect joints to shielding pipes, bonding the built-in metal fixings of PT plugs to the external shielding of the plug, etc.

[0038] The beneficial effects of the present application will be further illustrated below with reference to examples and comparative examples.

[0039] Example 1

[0040] This embodiment provides an adhesive for bonding metal and silicone rubber, comprising 30 wt% of a silane coupling agent, 4.5 wt% of a titanate coupling agent, 33 wt% of a conductive agent, 1.5 wt% of an auxiliary agent, and the remainder being a solvent. The silane coupling agent comprises epoxypropyltrimethoxysilane and aminopropyltrimethoxysilane in a mass ratio of 14:16; the titanate coupling agent comprises isopropyl triisostearate titanate and isopropyl dioleate titanate in a mass ratio of 3:1.5; the conductive agent is superconducting carbon black; the auxiliary agent comprises bis-[γ-(carboxysilyl)propyl] tetrasulfide and phthalocyanine blue in a mass ratio of 1:0.5; and the solvent comprises ethyl acetate and n-heptane in a mass ratio of 1:1.8.

[0041] The adhesive is prepared according to the following steps: dispersing epoxypropyltrimethoxysilane and aminopropyltrimethoxysilane in ethyl acetate, adding phthalocyanine blue, and stirring to obtain a mixed solution. The mixed solution is transferred to a three-necked flask equipped with a stirrer, a condenser, and a dropping funnel. The water bath is turned on and the temperature is raised to 65°C. After heating for 1 hour, superconducting carbon black is added and stirred at 60 rpm for 0.5 hour. Then, bis-[γ-(carboxylsilyl)propyl]tetrasulfide, isopropyl triisostearate titanate, isopropyl dioleate titanate, and n-heptane are added. The water bath is turned off and stirred at 85 rpm for 2 hours to obtain an adhesive for bonding metal and silicone rubber.

[0042] Example 2

[0043] The difference between Example 2 and Example 1 is that the content of each component in the adhesive is adjusted so that the adhesive includes 25 wt% silane coupling agent, 8 wt% titanate coupling agent, 40 wt% conductive agent, 2.7 wt% auxiliary agent, and the balance is solvent.

[0044] Example 3

[0045] The difference between Example 3 and Example 1 is that the content of each component in the adhesive is adjusted so that the adhesive includes 40 wt % of a silane coupling agent, 4 wt % of a titanate coupling agent, 30 wt % of a conductive agent, and the remainder is a solvent.

[0046] Example 4

[0047] The difference between Example 4 and Example 1 is that the mass ratio of glycidyltrimethoxysilane and aminopropyltrimethoxysilane in the silane coupling agent is adjusted so that the mass ratio of the two is 10:22.

[0048] Example 5

[0049] The difference between Example 5 and Example 1 is that the mass ratio of glycidyltrimethoxysilane and aminopropyltrimethoxysilane in the silane coupling agent is adjusted so that the mass ratio of the two is 18:15.

[0050] Example 6

[0051] The difference between Example 6 and Example 1 is that the mass ratio of isopropyl triisostearate titanate and isopropyl dioleate titanate in the titanate coupling agent is adjusted so that the mass ratio of the two is 3:3.

[0052] Example 7

[0053] The difference between Example 7 and Example 1 is that the mass ratio of isopropyl triisostearate titanate and isopropyl dioleate titanate in the titanate coupling agent is adjusted so that the mass ratio of the two is 5:1.

[0054] Example 8

[0055] The difference between Example 8 and Example 1 is that the mass ratio of isopropyl triisostearate titanate and isopropyl dioleate titanate in the titanate coupling agent is adjusted so that the mass ratio of the two is 1:3.

[0056] Example 9

[0057] The difference between Example 9 and Example 1 is that the mass ratio of isopropyl triisostearate titanate and isopropyl dioleate titanate in the titanate coupling agent is adjusted so that the mass ratio of the two is 7:1.

[0058] Example 10

[0059] The difference between Example 10 and Example 1 is that the mass ratio of bis-[γ-(carboxysilyl)propyl]tetrasulfide and phthalocyanine blue in the auxiliary agent is adjusted to be 1:0.7.

[0060] Example 11

[0061] The difference between Example 11 and Example 1 is that the mass ratio of bis-[γ-(carboxysilyl)propyl]tetrasulfide and phthalocyanine blue in the auxiliary agent is adjusted to be 2:0.3.

[0062] Example 12

[0063] The difference between Example 12 and Example 1 is that the mass ratio of bis-[γ-(carboxysilyl)propyl]tetrasulfide and phthalocyanine blue in the auxiliary agent is adjusted to be 0.5:1.0.

[0064] Example 13

[0065] The difference between Example 13 and Example 1 is that the mass ratio of bis-[γ-(carboxysilyl)propyl]tetrasulfide and phthalocyanine blue in the auxiliary agent is adjusted to be 2.5:0.1.

[0066] Example 14

[0067] The difference between Example 14 and Example 1 is that the components of the titanate coupling agent are adjusted so that the titanate coupling agent is isopropyl dioleate titanate.

[0068] Example 15

[0069] The difference between Example 15 and Example 1 is that the components of the titanate coupling agent are adjusted so that the titanate coupling agent includes bis(octyl pyrophosphate) glycolate titanate and isopropyl dioleate titanate.

[0070] Example 16

[0071] The difference between Example 16 and Example 1 is that the component of the stabilizer is adjusted so that the stabilizer is bis-[γ-(triethoxysilyl)propyl]tetrasulfide.

[0072] Example 17

[0073] The difference between Example 17 and Example 1 is that the content of each component in the binder is adjusted so that the binder includes 10 wt% of epoxypropyltrimethoxysilane, 22 wt% of aminopropyltrimethoxysilane, 3 wt% of isopropyl triisostearate titanate, 3 wt% of isopropyl dioleate titanate, 30 wt% of superconducting carbon black, 1 wt% of bis-[γ-(carboxysilyl)propyl]tetrasulfide, 0.3 wt% of phthalocyanine blue, and the balance is solvent.

[0074] Example 18

[0075] The difference between Example 18 and Example 1 is that the content of each component in the adhesive is adjusted so that the adhesive includes 18 wt% of epoxypropyltrimethoxysilane, 15 wt% of aminopropyltrimethoxysilane, 5 wt% of isopropyl triisostearate titanate, 1 wt% of isopropyl dioleate titanate, 40 wt% of superconducting carbon black, 2 wt% of bis-[γ-(carboxysilyl)propyl]tetrasulfide, 0.7 wt% of phthalocyanine blue, and the balance is solvent.

[0076] Comparative Example 1

[0077] The difference between Comparative Example 1 and Example 1 is that the content of each component in the adhesive is adjusted so that the adhesive includes 15 wt % silane coupling agent, 12 wt % titanate coupling agent, 50 wt % conductive agent, 4 wt % auxiliary agent, and the balance is solvent.

[0078] Comparative Example 2

[0079] The difference between Comparative Example 2 and Example 1 is that the content of each component in the adhesive is adjusted so that the adhesive includes 50 wt % silane coupling agent, 1 wt % titanate coupling agent, 20 wt % conductive agent, 1 wt % auxiliary agent, and the balance is solvent.

[0080] Comparative Example 3

[0081] The difference between Comparative Example 3 and Example 1 is that the mass ratio of glycidyltrimethoxysilane and aminopropyltrimethoxysilane in the silane coupling agent is adjusted so that the mass ratio of the two is 5:27.

[0082] Comparative Example 4

[0083] The difference between Comparative Example 4 and Example 1 is that the mass ratio of glycidyltrimethoxysilane and aminopropyltrimethoxysilane in the silane coupling agent is adjusted so that the mass ratio of the two is 23:10.

[0084] Comparative Example 5

[0085] The difference between Comparative Example 5 and Example 1 is that the components of the silane coupling agent are adjusted so that the silane coupling agent is aminopropyltrimethoxysilane.

[0086] Comparative Example 6

[0087] The difference between Comparative Example 6 and Example 1 is that the components of the silane coupling agent are adjusted so that the silane coupling agent is glycidyltrimethoxysilane.

[0088] Comparative Example 7

[0089] The difference between Comparative Example 7 and Example 1 is that the components of the silane coupling agent are adjusted so that the silane coupling agent is vinyltri(β-methoxyethoxy)silane and aminopropyltrimethoxysilane.

[0090] Comparative Example 8

[0091] The difference between Comparative Example 8 and Example 1 is that the components of the silane coupling agent are adjusted so that the silane coupling agent is glycidyltrimethoxysilane and vinyltriethoxysilane.

[0092] Test items

[0093] The copper sheet was cleaned and the adhesive provided in the examples and comparative examples of this application was applied to the surface of the sheet. The adhesive was heated at 120°C for 30 minutes and then cured to form a film to obtain a bonded copper sheet. The cured adhesive film had a thickness of 30 μm. The bonded copper sheet was allowed to stand for 2 hours, and the volume resistivity was calculated according to GB / T3048.3-2007, "Test Method for Volume Resistivity of Semi-Conductive Rubber and Plastic Materials."

[0094] A copper sheet to be bonded was placed in a test mold. Semiconductive liquid silicone rubber (SILASTICHV1523-30) was injected onto the sheet. The sheet was cured at 85°C for 1 hour to obtain the test copper sheet. The sheet was then removed from the test mold and subjected to peel strength testing according to GB / T 11211-2009, "Adhesion Strength of Vulcanized Rubber or Thermoplastic Rubber to Metal," and the failure mode was recorded. Rubber failure indicates strong adhesion between the metal and silicone rubber; adhesive-metal interface failure indicates poor adhesion. The results of volume resistivity, peel strength, and failure mode are shown in Table 1.

[0095] Table 1

[0096]

[0097]

[0098] The experimental data from Examples 1, 2, 3, 17, and 18 and Comparative Examples 1 and 2 indicate that when the adhesive for bonding metal and silicone rubber of the present invention comprises 25-40 wt% of a silane coupling agent, 4-8 wt% of a titanate coupling agent, 30-40 wt% of a conductive agent, and 0-2.7 wt% of an auxiliary agent, the metal-silicone rubber exhibits strong adhesion and excellent conductivity. However, when the ratio of the adhesive for bonding metal and silicone rubber is changed, both strong adhesion and excellent conductivity cannot be achieved.

[0099] The experimental data from Examples 1, 4, and 5 and Comparative Examples 3, 4, 5, 6, 7, and 8 indicate that when the silane coupling agent in the metal-silicone rubber bonding agent of the present invention includes glycidyltrimethoxysilane and aminopropyltrimethoxysilane in a mass ratio of (10-18):(15-22), the bonding between the metal and the silicone rubber is strong and the conductivity is excellent. However, when the components or ratio of the silane coupling agent are changed, the bonding between the metal and the silicone rubber is poor.

[0100] The experimental data from Examples 1, 6, 7, and 8, 9, 14, and 15 indicate that when the titanate coupling agent in the metal-silicone rubber bonding agent of the present invention includes isopropyl triisostearate titanate and isopropyl dioleate titanate in a mass ratio of (3-5):(1-3), the metal-silicone rubber exhibits strong adhesion and excellent conductivity. However, when the titanate coupling agent components or ratios are changed, the metal-silicone rubber exhibits poor adhesion.

[0101] The experimental data from Examples 1, 10, 11, and 12 and 13 show that when the additives in the adhesive for bonding metal and silicone rubber of the present invention include a stabilizer and a pigment in a mass ratio of (1-2):(0.3-0.7), the metal-silicone rubber bond is strong and the conductivity is excellent. When the additive ratio is changed, the conductivity between the metal and silicone rubber is significantly reduced.

[0102] The experimental data from Examples 1 and 16 show that when the stabilizer in the additive is one or more of bis-[γ-(carboxysilyl)propyl]tetrasulfide and bis-[γ-(carboxysilyl)propyl]disulfide, the adhesion between the metal and the silicone rubber is strong and the conductivity is excellent. However, when the stabilizer composition is changed, the conductivity between the metal and the silicone rubber is significantly reduced.

[0103] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0104] The adhesive for bonding metal and silicone rubber provided by the present application is cross-linked with silicone rubber through a silane coupling agent at one end, so that a strong bonding force is formed between the adhesive and the silicone rubber; the other end is cross-linked with the metal surface through a titanate coupling agent, so that a stable chemical bond is formed between the adhesive and the metal surface, thereby improving the bonding performance between the metal and the silicone rubber. The conductive agent gives the adhesive excellent electrical conductivity, thereby significantly enhancing the electrical conductivity between the metal and the silicone rubber. Therefore, the present application not only improves the bonding performance of the metal and the silicone rubber, but also enhances the electrical conductivity, promotes product stability, and reduces maintenance costs by utilizing the synergistic effect between the silane coupling agent, titanate coupling agent and conductive agent in a specific ratio. In addition, the silane coupling agent formed by the mutual cooperation of glycidyltrimethoxysilane and aminopropyltrimethoxysilane at a specific mass ratio further enhances the bonding force between the adhesive and the silicone rubber, thereby further improving the bonding performance between the metal and the silicone rubber.

[0105] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An adhesive for bonding metal and silicone rubber, characterized in that: The adhesive for bonding metal and silicone rubber includes 25-40 wt% of a silane coupling agent, 4-8 wt% of a titanate coupling agent, 30-40 wt% of a conductive agent, 0-2.7 wt% of an auxiliary agent, and the remainder is a solvent; wherein the silane coupling agent includes epoxypropyltrimethoxysilane and aminopropyltrimethoxysilane, and the mass ratio of the two is (10-18): (15-22).

2. The adhesive for bonding metal and silicone rubber according to claim 1, characterized in that: The titanate coupling agent includes isopropyl triisostearate titanate and isopropyl dioleate titanate, and the mass ratio of the two is (3-5): (1-3).

3. The adhesive for bonding metal and silicone rubber according to claim 1, characterized in that: The conductive agent includes at least one of superconducting carbon black and double-walled carbon nanotubes.

4. The adhesive for bonding metal and silicone rubber according to claim 3, characterized in that: The conductive agent is superconducting carbon black.

5. The adhesive for bonding metal and silicone rubber according to claim 1, characterized in that: The solvent includes at least one of ethyl acetate, n-heptane, m-xylene and butanone.

6. The adhesive for bonding metal and silicone rubber according to claim 5, characterized in that: The solvent is ethyl acetate and n-heptane, and the mass ratio of the two is 1:1.5~2.

7. The adhesive for bonding metal and silicone rubber according to claim 1, characterized in that: The auxiliary agents include stabilizers and pigments and fillers, and the mass ratio of the two is (1-2): (0.3-0.7).

8. The adhesive for bonding metal and silicone rubber according to claim 7, characterized in that: The stabilizer includes at least one of bis-[γ-(carboxysilyl)propyl]tetrasulfide and bis-[γ-(carboxysilyl)propyl]disulfide.

9. The adhesive for bonding metal and silicone rubber according to claim 7, characterized in that: The pigment filler includes at least one of phthalocyanine blue, phthalocyanine green, and iron oxide red.

10. The adhesive for bonding metal and silicone rubber according to any one of claims 1 to 9, characterized in that: The adhesive for bonding the metal and the silicone rubber includes 10-18 wt% of epoxypropyltrimethoxysilane, 15-22 wt% of aminopropyltrimethoxysilane, 3-5 wt% of isopropyl triisostearate titanate, 1-3 wt% of isopropyl dioleate titanate, 30-40 wt% of superconducting carbon black, 1-2 wt% of a stabilizer, 0.3-0.7 wt% of a pigment and filler, and the balance is a solvent.

11. The method for preparing an adhesive for bonding metal and silicone rubber according to any one of claims 1 to 10, characterized in that: The steps include: The adhesive for bonding metal and silicone rubber is obtained by mixing epoxypropyltrimethoxysilane, aminopropyltrimethoxysilane, the titanate coupling agent, the conductive agent, the auxiliary agent and the solvent.

12. Use of the adhesive for bonding metals and silicone rubber according to any one of claims 1 to 10 or the adhesive for bonding metals and silicone rubber obtained by the preparation method according to claim 11 in the power industry.

Images