High-resilience silicone rubber material and preparation method thereof

Abstract

The invention discloses a high-resilience silicone rubber material and a preparation method thereof. The high-resilience silicone rubber material is prepared from methyl vinyl silicone rubber, carbon black, carbon nanotubes, graphite, graphene, a cross-linking agent, a foaming agent, an auxiliary foaming agent, a vulcanizing agent and an auxiliary vulcanizing agent. The preparation method comprises the following steps: step 1, preparing raw materials; 2, dispersing the carbon black and the carbon nanotubes; step 3, mechanical blending and filling; step 4, cross-linking and vulcanizing; step 5, construction of a foaming system; step 6, vulcanization and foaming molding; step 7, post-processing and performance verification; the carbon black and the carbon nanotubes are added, a network structure in a methyl vinyl silicone rubber matrix is constructed through the synergistic effect of the carbon black and the carbon nanotubes, based on the nano-spring effect of the carbon nanotube material, the silicone rubber composite material is endowed with high elasticity and flexibility, the processability is improved, and the application range is widened; by adding the graphite and graphene filler, the mechanical strength and damping performance of the silicone rubber are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of silicone rubber materials, in particular to a high-resilience silicone rubber material and a preparation method thereof. Background Art

[0002] Silicone rubber material is a polymer elastomer with unique properties. It is mainly composed of silicon, oxygen atoms and organic side chains. Its main chain is composed of alternating silicon and oxygen atoms. This special structure gives silicone rubber a series of excellent properties. Silicone rubber material has attracted much attention due to its unique properties and wide range of applications.

[0003] Existing silicone rubber materials have the following defects: First, the elasticity of silicone rubber materials is relatively poor, and the processing performance is also poor, which makes it difficult for silicone rubber to achieve the ideal shape and dimensional stability during the manufacturing process. At the same time, the poor elasticity also means that silicone rubber performs poorly in certain applications that require high elastic recovery and cannot meet specific performance requirements; Second, the sound absorption performance of traditional silicone rubber is relatively low. In occasions requiring good sound absorption effects, such as sound insulation materials, acoustic equipment, etc., silicone rubber performs poorly, limiting the further expansion of silicone rubber in the acoustic field; Third, the mechanical strength of traditional silicone rubber materials is relatively low, and the damping performance is also insufficient, which leads to its poor performance in occasions subjected to large mechanical stress or requiring good damping effects, thereby limiting its application potential. Summary of the Invention

[0004] The object of the present invention is to provide a high resilience silicone rubber material and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a high resilience silicone rubber material, the formula of which includes: methyl vinyl silicone rubber, carbon black, carbon nanotubes, graphite, graphene, a crosslinking agent, a foaming agent, a co-foaming agent, a vulcanizing agent and a co-vulcanizing agent, wherein the mass percentages of the components are: 60% to 80% of methyl vinyl silicone rubber, 5% to 8% of carbon black, 0.5% to 5% of carbon nanotubes, 2% to 6% of graphite, 1% to 5% of graphene, 1% to 5% of a crosslinking agent, 2% to 5% of a foaming agent, 0.5% to 3% of a co-foaming agent, 1% to 4% of a vulcanizing agent and 0.5% to 2% of a co-vulcanizing agent.

[0006] As a further technical solution of the present invention, the mass percentages of the components are: 65% methyl vinyl silicone rubber, 7% carbon black, 2% carbon nanotubes, 6% graphite, 3% graphene, 4% cross-linking agent, 5% foaming agent, 2% co-foaming agent, 4% vulcanizing agent and 2% co-vulcanizing agent.

[0007] As a further technical solution of the present invention, the mass percentages of the components are: 70% methyl vinyl silicone rubber, 5% carbon black, 5% carbon nanotubes, 4% graphite, 5% graphene, 2% cross-linking agent, 3% foaming agent, 3% co-foaming agent, 2% vulcanizing agent and 1% co-vulcanizing agent.

[0008] As a further technical solution of the present invention, the mass percentages of the components are: 75% methyl vinyl silicone rubber, 6% carbon black, 3% carbon nanotubes, 3% graphite, 4% graphene, 3% cross-linking agent, 2% foaming agent, 2% co-foaming agent, 1% vulcanizing agent and 1% co-vulcanizing agent.

[0009] As a further technical solution of the present invention, the cross-linking agent is dibenzoyl peroxide, the foaming agent is azodicarbonamide, and the auxiliary foaming agent is nano zinc oxide, which are used to regulate the foaming process and control the decomposition rate of the foaming agent.

[0010] As a further technical solution of the present invention, the vulcanizing agent is dicumyl peroxide, which can decompose at high temperature to generate free radicals, thereby initiating the vulcanization reaction of the silicone rubber. The co-vulcanizing agent is one of dibenzothiazole disulfide and tetramethylthiuram disulfide, which is used to accelerate the decomposition of the vulcanizing agent and the progress of the vulcanization reaction.

[0011] A method for preparing a high-resilience silicone rubber material, comprising the following steps: 1. preparing raw materials; 2. dispersing carbon black and carbon nanotubes; 3. mechanically blending and filling; 4. crosslinking and vulcanization; 5. constructing a foaming system; 6. vulcanization and foaming molding; and 7. post-processing and performance verification.

[0012] In the above step 1, prepare all necessary raw materials and ensure that the quality and purity of the raw materials meet the standards;

[0013] In the above step 2, carbon black and carbon nanotubes with nano-spring effect are uniformly dispersed in methyl vinyl silicone rubber to construct a key network structure of a highly elastic silicone rubber composite material;

[0014] In the above step 3, graphite and graphene are introduced into the silicone rubber as fillers by mechanical blending to improve the mechanical strength and damping performance of the silicone rubber;

[0015] In the above step 4, a proper amount of a crosslinking agent and a vulcanizing agent are added to the silicone rubber composite material to form a stable network structure and promote the vulcanization reaction, thereby improving the strength and elasticity of the silicone rubber;

[0016] In the above step 5, a foaming agent and a foaming aid are added to the silicone rubber composite material to construct a porous structure required for the foamed sound-absorbing material;

[0017] In the above step 6, the silicone rubber composite material to which all raw materials are added is placed in a vulcanization device for vulcanization treatment, and the decomposition of the foaming agent and the release of gas are controlled at the same time, so that the material forms a porous foam structure with excellent damping performance and good sound absorption performance;

[0018] In the above step seven, the prepared high resilience silicone rubber material is cooled, cut and surface treated, and subjected to elasticity testing, damping performance testing and sound absorption performance testing to ensure that the material meets design requirements and application needs.

[0019] As a further technical solution of the present invention, in step 2, carbon black and carbon nanotubes are added to methyl vinyl silicone rubber, and a mechanical stirrer is used to stir and mix them at a stirring speed of 200 to 500 rpm. After stirring for 30 to 60 minutes, the mixture is transferred to an ultrasonic dispersing device for uniform dispersion treatment to ensure that the carbon black and carbon nanotubes form a good network structure in the silicone rubber.

[0020] As a further technical solution of the present invention, in step three, graphite and graphene are added to the silicone rubber as fillers and mechanically blended using a high-speed mixer at a mixing speed of 500 to 1000 rpm for 60 to 90 minutes to ensure that the graphite and graphene are uniformly dispersed in the silicone rubber matrix to improve the mechanical strength and damping properties of the silicone rubber.

[0021] As a further technical solution of the present invention, in step five, a foaming agent and a co-foaming agent are added to the silicone rubber composite material, and the mixture is stirred evenly using a stirrer to ensure that the foaming agent is evenly distributed in the silicone rubber. The decomposition temperature of the foaming agent is 180 to 220°C. By adjusting the decomposition temperature of the foaming agent, the coordination of the foaming process and the vulcanization process is ensured.

[0022] Compared with the prior art, the present invention has the following beneficial effects: by adding carbon black and carbon nanotubes, a network structure is constructed in a methyl vinyl silicone rubber matrix through the synergistic effect of carbon black and carbon nanotubes, and based on the nano-spring effect of the carbon nanotube material, the silicone rubber composite material is given high elasticity and flexibility, thereby improving the processing performance and application range; by adding graphite and graphene fillers, the mechanical strength and damping performance of the silicone rubber are significantly improved, so that it can meet higher requirements for industrial applications, and by introducing a foaming agent and a foaming aid, the foaming process is matched with the vulcanization process by regulating the decomposition temperature and rate of the foaming agent, ensuring that the foaming process is carried out during the vulcanization process, thereby preparing a foamed sound-absorbing material with a porous structure, improving the sound absorption performance of the material, and the prepared composite material not only has excellent damping performance, but also gives the material good sound absorption performance through foaming treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1 , a technical solution provided by the present invention:

[0026] Example 1

[0027] A high-resilience silicone rubber material comprises a formula comprising: methyl vinyl silicone rubber, carbon black, carbon nanotubes, graphite, graphene, a crosslinking agent, a foaming agent, a co-foaming agent, a vulcanizing agent and a co-vulcanizing agent. The mass percentages of the components are: 65% methyl vinyl silicone rubber, 7% carbon black, 2% carbon nanotubes, 6% graphite, 3% graphene, 4% crosslinking agent, 5% foaming agent, 2% co-foaming agent, 4% vulcanizing agent and 2% co-vulcanizing agent. The crosslinking agent is dibenzoyl peroxide, the foaming agent is azodicarbonamide, the co-foaming agent is nano zinc oxide, and is used to regulate the foaming process and control the decomposition rate of the foaming agent. The vulcanizing agent is dicumyl peroxide, which can decompose at high temperature to generate free radicals and initiate the vulcanization reaction of the silicone rubber. The co-vulcanizing agent is one of dibenzothiazole disulfide and tetramethylthiuram disulfide, and is used to accelerate the decomposition of the vulcanizing agent and the progress of the vulcanization reaction.

[0028] A method for preparing a high-resilience silicone rubber material, comprising the following steps: 1. preparing raw materials; 2. dispersing carbon black and carbon nanotubes; 3. mechanically blending and filling; 4. crosslinking and vulcanization; 5. constructing a foaming system; 6. vulcanization and foaming molding; and 7. post-processing and performance verification.

[0029] In the above step 1, prepare all necessary raw materials and ensure that the quality and purity of the raw materials meet the standards;

[0030] In the above step 2, carbon black and carbon nanotubes are added to methyl vinyl silicone rubber, stirred and mixed using a mechanical stirrer at a stirring speed of 200 to 500 rpm, stirred for 30 to 60 minutes, and then transferred to an ultrasonic dispersing device for uniform dispersion treatment to ensure that the carbon black and carbon nanotubes form a good network structure in the silicone rubber;

[0031] In the above step 3, graphite and graphene are added as fillers to the silicone rubber and mechanically blended using a high-speed mixer at a mixing speed of 500 to 1000 rpm for 60 to 90 minutes to ensure that the graphite and graphene are uniformly dispersed in the silicone rubber matrix to improve the mechanical strength and damping properties of the silicone rubber;

[0032] In the above step 4, a proper amount of a crosslinking agent and a vulcanizing agent are added to the silicone rubber composite material to form a stable network structure and promote the vulcanization reaction, thereby improving the strength and elasticity of the silicone rubber;

[0033] In the above step 5, a foaming agent and a co-foaming agent are added to the silicone rubber composite material, and stirred evenly using a stirrer to ensure that the foaming agent is evenly distributed in the silicone rubber. The decomposition temperature of the foaming agent is 180-220° C. By adjusting the decomposition temperature of the foaming agent, the foaming process and the vulcanization process are coordinated;

[0034] In the above step 6, the silicone rubber composite material to which all raw materials are added is placed in a vulcanization device for vulcanization treatment, and the decomposition of the foaming agent and the release of gas are controlled at the same time, so that the material forms a porous foam structure with excellent damping performance and good sound absorption performance;

[0035] In the above step seven, the prepared high resilience silicone rubber material is cooled, cut and surface treated, and subjected to elasticity testing, damping performance testing and sound absorption performance testing to ensure that the material meets design requirements and application needs.

[0036] Example 2

[0037] A high-resilience silicone rubber material comprises a formula comprising: methyl vinyl silicone rubber, carbon black, carbon nanotubes, graphite, graphene, a crosslinking agent, a foaming agent, a co-foaming agent, a vulcanizing agent, and a co-vulcanizing agent. The mass percentages of the components are: 70% methyl vinyl silicone rubber, 5% carbon black, 5% carbon nanotubes, 4% graphite, 5% graphene, 2% crosslinking agent, 3% foaming agent, 3% co-foaming agent, 2% vulcanizing agent, and 1% co-vulcanizing agent. The crosslinking agent is dibenzoyl peroxide, the foaming agent is azodicarbonamide, and the co-foaming agent is nano-zinc oxide, which is used to regulate the foaming process and control the decomposition rate of the foaming agent. The vulcanizing agent is dicumyl peroxide, which can decompose at high temperature to generate free radicals and initiate the vulcanization reaction of the silicone rubber. The co-vulcanizing agent is one of dibenzothiazole disulfide and tetramethylthiuram disulfide, which is used to accelerate the decomposition of the vulcanizing agent and the progress of the vulcanization reaction. The preparation method is consistent with that of Example 1.

[0038] Example 3

[0039] A high-resilience silicone rubber material comprises: methyl vinyl silicone rubber, carbon black, carbon nanotubes, graphite, graphene, a crosslinking agent, a foaming agent, a co-foaming agent, a vulcanizing agent, and a co-vulcanizing agent. The mass percentages of the components are: 75% methyl vinyl silicone rubber, 6% carbon black, 3% carbon nanotubes, 3% graphite, 4% graphene, 3% crosslinking agent, 2% foaming agent, 2% co-foaming agent, 1% vulcanizing agent, and 1% co-vulcanizing agent. The crosslinking agent is dibenzoyl peroxide, the foaming agent is azodicarbonamide, and the co-foaming agent is nano-zinc oxide, which is used to regulate the foaming process and control the decomposition rate of the foaming agent. The vulcanizing agent is dicumyl peroxide, which can decompose at high temperature to generate free radicals and initiate the vulcanization reaction of the silicone rubber. The co-vulcanizing agent is one of dibenzothiazole disulfide and tetramethylthiuram disulfide, which is used to accelerate the decomposition of the vulcanizing agent and the progress of the vulcanization reaction. The preparation method is consistent with that of Example 1.

[0040] The specific composition ratios of each embodiment are shown in the following table:

[0041]

[0042]

[0043] Based on the above, the advantages of the present invention are: the present invention combines the unique properties of carbon black and carbon nanotubes, constructs a network structure in the methyl vinyl silicone rubber matrix, relies on the synergistic effect between carbon black and carbon nanotubes, and fully utilizes the nano spring effect unique to carbon nanotube materials, giving the silicone rubber composite material high elasticity and flexibility, so that the material exhibits more outstanding plasticity and adaptability during processing, and at the same time greatly expands its application range, making it capable of meeting more diversified industrial needs. Furthermore, the present invention introduces two high-performance fillers, graphite and graphene, to achieve the mechanical strength and resistance of silicone rubber. The significant improvement in the sound-absorbing performance enables it to easily cope with more demanding industrial application environments and exhibit more outstanding durability and stability. In addition, the present invention also introduces a foaming agent and an auxiliary foaming agent in the preparation process. By regulating the decomposition temperature and rate of the foaming agent, the foaming process and the vulcanization process are matched, ensuring that the foaming process proceeds in an orderly manner during the vulcanization process, thereby preparing a foamed sound-absorbing material with a fine porous structure. This porous structure not only gives the material a lighter texture, but also significantly improves its sound absorption performance, so that the composite material has excellent sound absorption and noise reduction capabilities while maintaining excellent damping performance.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A high resilience silicone rubber material, the formula of which includes: Methyl vinyl silicone rubber, carbon black, carbon nanotubes, graphite, graphene, a crosslinking agent, a foaming agent, a co-foaming agent, a vulcanizing agent and a co-vulcanizing agent, characterized in that the mass percentages of the components are: 60% to 80% of methyl vinyl silicone rubber, 5% to 8% of carbon black, 0.5% to 5% of carbon nanotubes, 2% to 6% of graphite, 1% to 5% of graphene, 1% to 5% of a crosslinking agent, 2% to 5% of a foaming agent, 0.5% to 3% of a co-foaming agent, 1% to 4% of a vulcanizing agent and 0.5% to 2% of a co-vulcanizing agent.

2. The high resilience silicone rubber material according to claim 1, characterized in that: The mass percentages of the components are: 65% methyl vinyl silicone rubber, 7% carbon black, 2% carbon nanotubes, 6% graphite, 3% graphene, 4% cross-linking agent, 5% foaming agent, 2% co-foaming agent, 4% vulcanizing agent and 2% co-vulcanizing agent.

3. The high resilience silicone rubber material according to claim 1, characterized in that: The mass percentages of the components are: 70% methyl vinyl silicone rubber, 5% carbon black, 5% carbon nanotubes, 4% graphite, 5% graphene, 2% cross-linking agent, 3% foaming agent, 3% co-foaming agent, 2% vulcanizing agent and 1% co-vulcanizing agent.

4. The high resilience silicone rubber material according to claim 1, characterized in that: The mass percentages of the components are: 75% methyl vinyl silicone rubber, 6% carbon black, 3% carbon nanotubes, 3% graphite, 4% graphene, 3% cross-linking agent, 2% foaming agent, 2% co-foaming agent, 1% vulcanizing agent and 1% co-vulcanizing agent.

5. The high resilience silicone rubber material according to claim 1, characterized in that: The cross-linking agent is dibenzoyl peroxide, the foaming agent is azodicarbonamide, and the auxiliary foaming agent is nano zinc oxide, which are used to adjust the foaming process and control the decomposition rate of the foaming agent.

6. The high resilience silicone rubber material according to claim 4, characterized in that: The vulcanizing agent is dicumyl peroxide, which can decompose at high temperature to generate free radicals and initiate the vulcanization reaction of the silicone rubber. The co-vulcanizing agent is one of dibenzothiazole disulfide and tetramethylthiuram disulfide, which is used to accelerate the decomposition of the vulcanizing agent and the progress of the vulcanization reaction.

7. A method for preparing a high-resilience silicone rubber material, comprising step 1: preparing raw materials; step 2: dispersing carbon black and carbon nanotubes; step 3: mechanically blending and filling; step 4: crosslinking and vulcanization; step 5: constructing a foaming system; step 6: vulcanization and foaming molding; and step 7: post-processing and performance verification. The method is characterized in that: In the above step 1, prepare all necessary raw materials and ensure that the quality and purity of the raw materials meet the standards; In the above step 2, carbon black and carbon nanotubes with nano-spring effect are uniformly dispersed in methyl vinyl silicone rubber to construct a key network structure of a highly elastic silicone rubber composite material; In the above step 3, graphite and graphene are introduced into the silicone rubber as fillers by mechanical blending to improve the mechanical strength and damping performance of the silicone rubber; In the above step 4, a proper amount of a crosslinking agent and a vulcanizing agent are added to the silicone rubber composite material to form a stable network structure and promote the vulcanization reaction, thereby improving the strength and elasticity of the silicone rubber; In the above step 5, a foaming agent and a foaming aid are added to the silicone rubber composite material to construct a porous structure required for the foamed sound-absorbing material; In the above step 6, the silicone rubber composite material to which all raw materials are added is placed in a vulcanization device for vulcanization treatment, and the decomposition of the foaming agent and the release of gas are controlled at the same time, so that the material forms a porous foam structure with excellent damping performance and good sound absorption performance; In the above step seven, the prepared high resilience silicone rubber material is cooled, cut and surface treated, and subjected to elasticity testing, damping performance testing and sound absorption performance testing to ensure that the material meets design requirements and application needs.

8. The method for preparing a high resilience silicone rubber material according to claim 7, characterized in that: In the step 2, carbon black and carbon nanotubes are added to methyl vinyl silicone rubber, stirred and mixed using a mechanical stirrer at a stirring speed of 200 to 500 rpm, and then transferred to an ultrasonic dispersing device for uniform dispersion treatment to ensure that the carbon black and carbon nanotubes form a good network structure in the silicone rubber.

9. The method for preparing a high resilience silicone rubber material according to claim 7, characterized in that: In the step three, graphite and graphene are added to the silicone rubber as fillers and mechanically blended using a high-speed mixer at a mixing speed of 500 to 1000 rpm for 60 to 90 minutes to ensure that the graphite and graphene are uniformly dispersed in the silicone rubber matrix to improve the mechanical strength and damping performance of the silicone rubber.

10. The method for preparing a high resilience silicone rubber material according to claim 7, characterized in that: In the step 5, a foaming agent and a co-foaming agent are added to the silicone rubber composite material, and stirred evenly with a stirrer to ensure that the foaming agent is evenly distributed in the silicone rubber. The decomposition temperature of the foaming agent is 180-220° C. By adjusting the decomposition temperature of the foaming agent, the foaming process and the vulcanization process are coordinated.

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