Binder for bonding metal and silicone rubber as well as preparation method and application of binder

Abstract

The invention provides a binder for binding metal and silicone rubber as well as a preparation method and application of the binder. The binder for binding metal and silicone rubber comprises 25-40wt% of a silane coupling agent, 4-8wt% of a titanate coupling agent, 30-40wt% of a conductive agent, 0-2.7 wt% of an auxiliary agent and the balance of a solvent, wherein the silane coupling agent is prepared from epoxy propyl trimethoxy silane and aminopropyl trimethoxy silane, and the mass ratio of the epoxy propyl trimethoxy silane to the aminopropyl trimethoxy silane is (10 to 18) to (15 to 22). According to the binding agent for binding the metal and the silicon rubber, through the synergistic effect of the silane coupling agent, the titanate coupling agent and the conductive agent in a specific mass ratio, the binding performance of the metal and the silicon rubber is improved, and the conductive performance is also enhanced.

Description

Technical Field

[0001] The 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 industry and other related fields, the bonding of metal and silicone rubber is an indispensable process in the manufacture of complex components and equipment. However, although the adhesives used in the prior art can achieve basic bonding between metal and silicone rubber, they have significant defects in electrical conductivity. In the manufacture of power equipment, adhesives with poor electrical conductivity lead to poor shielding of electric fields, which in turn threatens 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 a preparation method and application thereof, so as to solve one of the problems of the adhesive in the prior art when bonding metal and silicone rubber, namely, low bonding strength, poor conductivity and increased maintenance cost.

[0006] In order 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 25-40wt% of a silane coupling agent, 4-8wt% of a titanate coupling agent, 30-40wt% of a conductive agent, 0-2.7wt% 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 filler, and the mass ratio of the two is (1-2): (0.3-0.7).

[0012] Further, 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 10-18wt% of epoxypropyltrimethoxysilane, 15-22wt% of aminopropyltrimethoxysilane, 3-5wt% of isopropyl triisostearate titanate, 1-3wt% of isopropyl dioleate titanate, 30-40wt% of superconducting carbon black, 1-2wt% of stabilizer, 0.3-0.7wt% of color 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 bonding agent for bonding metal and silicone rubber provided in the first aspect or the bonding agent for bonding metal and silicone rubber obtained by the preparation method provided in the second aspect in the electric 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, 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, a stable chemical bond is formed between the adhesive and the metal surface by a titanate coupling agent, thereby improving the bonding performance between the metal and the silicone rubber. The conductive agent gives the adhesive excellent conductivity, thereby significantly enhancing the 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 conductive performance, 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. In addition, the silane coupling agent formed by the mutual cooperation of glycidyl trimethoxysilane and aminopropyl trimethoxysilane under 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 in conjunction with 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 a preparation method and application thereof.

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

[0021] The adhesive for bonding metal and silicone rubber provided in the present 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, 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 of a specific mass ratio. In addition, the silane coupling agent formed by the mutual cooperation of glycidyl trimethoxysilane and aminopropyl trimethoxysilane under 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.

[0022] Typically but not limiting, the content of 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 numerical values; the content of titanate coupling agent is 4wt%, 4.5wt%, 5wt%, 6wt%, 7wt%, 8wt% or a range consisting of any two numerical values; the content of conductive agent is 30wt%, 33wt%, 34wt%, 36wt%, 38wt%, 40wt% or a range consisting of any two numerical values; the content of auxiliary agent is 0wt%, 1.3wt%, 1.5wt%, 1.8wt%, 2.2wt%, 2.7wt% or a range consisting of any two numerical values.

[0023] Typically but not limitatively, in the silane coupling agent provided in the present application, the mass ratio of glycidyltrimethoxysilane and 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 (3-5): (1-3).

[0025] Typically but not limiting, in the titanate coupling agent provided in the present application, 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 conductivity 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 Ketchen EC600JD.

[0028] The solvent in the present application is not specifically limited, and any commonly used solvent in the art can be used, including but not limited to ethyl acetate, n-heptane, m-xylene, butanone, etc. In order to further promote the dissolution of the components, the preferred solvent is ethyl acetate and n-heptane, and the mass ratio of the two is 1:1.5-2, and the mass ratio of the two is further preferably 1:1.8.

[0029] In some embodiments, 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).

[0030] Typically but not limiting, the mass ratio of stabilizer to pigment is, for example, 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 an acidic stabilizer group, which not only makes the surface groups of the conductive agent have good wettability, but also makes the conductive agent have excellent anti-settling ability, further promotes the uniform dispersion of the conductive agent in the adhesive of the metal and silicone rubber, and further prevents the conductive agent from precipitating after the adhesive is cured, thereby further improving the conductivity of the adhesive. The pigments and fillers in the additive are used to characterize whether the adhesive is mixed evenly. If the adhesive is not mixed evenly, the pigments and fillers will flocculate and coarse, which is particularly obvious under a scanning electron microscope. The uniform mixing of the adhesive can be judged by observing whether the pigments and fillers are flocculated under a scanning electron microscope to ensure that the subsequent conductive agent is evenly dispersed.

[0032] In order to further promote the dispersion and stabilization of the conductive agent in the adhesive bonding metal and 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 metal and 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 10-18wt% epoxypropyl trimethoxysilane, 15-22wt% aminopropyl trimethoxysilane, 3-5wt% isopropyl triisostearate titanate, 1-3wt% isopropyl dioleate titanate, 30-40wt% superconducting carbon black, 1-2wt% stabilizer, 0.3-0.7wt% pigment filler, and the balance is solvent. The various components within the above mass percentage range cooperate with each other to further improve 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, titanate coupling agent, conductive agent, auxiliary agent and 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 in the first typical embodiment or the bonding metal and silicone rubber adhesive obtained by the preparation method provided in the 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 in combination with embodiments and comparative examples.

[0039] Example 1

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

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

[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 25wt% silane coupling agent, 8wt% titanate coupling agent, 40wt% conductive agent, 2.7wt% 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 silane coupling agent, 4 wt % of titanate coupling agent, 30 wt % of conductive agent, and the balance is 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 so that the mass ratio of the two is 1:0.7.

[0060] Embodiment 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 so that the mass ratio of the two is 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 so that the mass ratio of the two is 0.5:1.0.

[0064] Embodiment 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 so that the mass ratio of the two is 2.5:0.1.

[0066] Embodiment 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] Embodiment 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 di(octyl pyrophosphate)hydroxyacetic acid 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] Embodiment 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 10wt% of epoxypropyltrimethoxysilane, 22wt% of aminopropyltrimethoxysilane, 3wt% of isopropyl triisostearate titanate, 3wt% of isopropyl dioleate titanate, 30wt% of superconducting carbon black, 1wt% of bis-[γ-(carboxysilicon)propyl]tetrasulfide, 0.3wt% of phthalocyanine blue, and the balance is solvent.

[0074] Embodiment 18

[0075] The difference between Example 18 and Example 1 is that the content of each component in the binder is adjusted so that the binder includes 18wt% of epoxypropyltrimethoxysilane, 15wt% of aminopropyltrimethoxysilane, 5wt% of isopropyl triisostearate titanate, 1wt% of isopropyl dioleate titanate, 40wt% of superconducting carbon black, 2wt% of bis-[γ-(carboxysilicon)propyl]tetrasulfide, 0.7wt% 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 15wt% silane coupling agent, 12wt% titanate coupling agent, 50wt% conductive agent, 4wt% 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 50wt% silane coupling agent, 1wt% titanate coupling agent, 20wt% conductive agent, 1wt% 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 vinyl tri(β-methoxyethoxy)silane and aminopropyl trimethoxysilane.

[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 metal sheet was cleaned, and the adhesive provided in the examples and comparative examples of the present application was brushed on the surface of the copper metal sheet, and then cured to form a film after heating at 120° C. for 30 minutes to obtain a copper metal sheet to be bonded, and the thickness of the adhesive cured film was 30 μm. The copper metal sheet to be bonded was placed for 2 hours, and the volume resistivity was calculated by referring to GB / T3048.3-2007 "Volume Resistivity Test of Semi-Conductive Rubber and Plastic Materials".

[0094] The copper metal sheet to be bonded is placed in the test mold, and the semi-conductive liquid silicone rubber (model SILASTICHV1523-30) is injected onto the copper metal sheet to be bonded. After curing at 85°C for 1 hour, the copper metal sheet to be tested is obtained. It is taken out of the test mold, and the peel strength is tested according to GB / T 11211-2009 "Adhesion Strength of Vulcanized Rubber or Thermoplastic Rubber to Metal", and the failure mode is recorded. When the failure mode is rubber failure, it means that the adhesion between the metal and the silicone rubber is strong; when the failure mode is adhesive-metal interface failure, it means that the adhesion between the metal and the silicone rubber is poor. The results of volume resistivity, peel strength and failure mode are shown in Table 1.

[0095] Table 1

[0096]

[0097]

[0098] From the experimental data of Examples 1, 2, 3, 17, 18 and Comparative Examples 1 and 2, it can be found that when the content of the silane coupling agent in the adhesive for bonding metal and silicone rubber of the present invention is 25-40wt%, the content of the titanate coupling agent is 4-8wt%, the content of the conductive agent is 30-40wt%, and the content of the auxiliary agent is 0-2.7wt%, the bonding between the metal and the silicone rubber is strong and the conductivity is excellent. When the ratio of the adhesive for bonding metal and silicone rubber is changed, it is impossible to take into account both strong bonding and excellent conductivity.

[0099] From the experimental data of Examples 1, 4, 5 and Comparative Examples 3, 4, 5, 6, 7, 8, it can be found that when the silane coupling agent in the adhesive for bonding metal and silicone rubber of the present invention includes epoxypropyl trimethoxysilane and aminopropyl trimethoxysilane, and the mass ratio of the two is (10-18): (15-22), the adhesion between the metal and the silicone rubber is strong and the conductivity is excellent. When the component or ratio of the silane coupling agent is changed, the adhesion between the metal and the silicone rubber is poor.

[0100] From the experimental data of Examples 1, 6, 7 and Examples 8, 9, 14, and 15, it can be found that when the titanate coupling agent in the bonding agent for bonding metal and silicone rubber of the present invention includes isopropyl triisostearate titanate and isopropyl dioleate titanate, and the mass ratio of the two is (3-5): (1-3), the bonding between the metal and the silicone rubber is strong and the conductivity is excellent. When the components or ratios of the titanate coupling agent are changed, the bonding between the metal and the silicone rubber is poor.

[0101] From the experimental data of Examples 1, 10, 11 and Examples 12, 13, it can be found that when the additives in the adhesive for bonding metal and silicone rubber of the present invention include stabilizers and pigments and fillers, and the mass ratio of the two is (1-2): (0.3-0.7), the bonding between metal and silicone rubber is strong and the conductivity is excellent. When the proportion of the additives is changed, the conductivity between metal and silicone rubber is significantly reduced.

[0102] From the experimental data of Example 1 and Example 16, it can be found that when the stabilizer in the auxiliary agent is any one or more of bis-[γ-(carboxylsilicon)propyl]tetrasulfide and bis-[γ-(carboxylsilicon)propyl]disulfide, the adhesion between the metal and the silicone rubber is strong and the conductivity is excellent. When the component of the stabilizer 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 by 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 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, 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 of a specific ratio. In addition, the silane coupling agent formed by the mutual cooperation of glycidyl trimethoxysilane and aminopropyl trimethoxysilane under 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 above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adhesive for bonding metal and silicone rubber, characterized in that: The bonding agent for bonding metal and silicone rubber includes 25-40wt% silane coupling agent, 4-8wt% titanate coupling agent, 30-40wt% conductive agent, 0-2.7wt% auxiliary agent, and the balance is 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, preferably superconducting carbon black.

4. 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; preferably ethyl acetate and n-heptane, and the mass ratio of the two is 1:1.5-2.

5. The adhesive for bonding metal and silicone rubber according to claim 1, characterized in that: 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).

6. The adhesive for bonding metal and silicone rubber according to claim 5, characterized in that: The stabilizer includes at least one of bis-[γ-(carboxysilyl)propyl]tetrasulfide and bis-[γ-(carboxysilyl)propyl]disulfide.

7. The adhesive for bonding metal and silicone rubber according to claim 5, characterized in that: The pigment filler includes at least one of phthalocyanine blue, phthalocyanine green and iron oxide red.

8. The adhesive for bonding metal and silicone rubber according to any one of claims 1 to 7, characterized in that: The bonding agent for bonding metal and silicone rubber comprises 10-18wt% of epoxypropyl trimethoxy silane, 15-22wt% of aminopropyl trimethoxy silane, 3-5wt% of isopropyl triisostearate titanate, 1-3wt% of isopropyl dioleate titanate, 30-40wt% of superconducting carbon black, 1-2wt% of stabilizer, 0.3-0.7wt% of color filler, and the balance is solvent.

9. The method for preparing an adhesive for bonding metal and silicone rubber according to any one of claims 1 to 8, characterized in that: The steps include: The epoxypropyl trimethoxysilane, the aminopropyl trimethoxysilane, the titanate coupling agent, the conductive agent, the auxiliary agent and the solvent are mixed to obtain the bonding agent for bonding metal and silicone rubber.

10. Use of the metal-silicone rubber bonding agent according to any one of claims 1 to 8 or the metal-silicone rubber bonding agent obtained by the preparation method according to claim 9 in the electric power industry.

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