High-conductivity colored silicone rubber material based on carbon nano tube as well as preparation and application of high-conductivity colored silicone rubber material

Abstract

The invention relates to the field of conductive silicone rubber, in particular to a high-conductivity colored silicone rubber material based on a carbon nano tube as well as preparation and application of the high-conductivity colored silicone rubber material. According to the high-conductivity colored silicone rubber material based on the carbon nano tube, the organic silicon raw rubber, the carbon nano tube slurry, the coupling agent, the white carbon black, the organic pigment paste and the vulcanizing agent are matched with one another according to a specific ratio, compatibility is good, and the prepared high-conductivity colored silicone rubber material has high conductivity and excellent mechanical property and also has the advantages of being high in conductivity, low in cost and the like. And the paint has a stable coloring effect and is not easy to fade. Specific organic pigment paste is selected, after addition, a cross-linked network and a carbon nanotube conductive path in the rubber material cannot be damaged, the conductivity, mechanical strength and processing fluidity of the material are not affected, the preparation process is simple, operation is easy to control, industrial mass production is facilitated, and the prepared colored silicone rubber material is stable in quality, excellent in comprehensive performance and suitable for industrial production. The industrial pain point that in the prior art, high-conductivity silicone rubber can only be black and cannot be colorful is solved.

Description

Technical Field

[0001] This invention relates to the field of conductive silicone rubber, specifically to highly conductive colored silicone rubber materials based on carbon nanotubes and their preparation and application. Background Technology

[0002] Currently, the preparation technology of highly conductive silicone rubber materials is relatively mature and widely used in electromagnetic shielding, antistatic applications, and flexible electronics. However, existing technologies have significant technical bottlenecks: traditional methods for achieving 10 4 Silicone rubber materials with high conductivity at the Ω / □ level almost all rely on high-filling amounts of dark conductive fillers such as carbon black and metal powder. The finished products are generally black, making it impossible to achieve multi-color customization and failing to meet consumer demands for product aesthetics and differentiation. At the same time, there is an inherent contradiction between high conductivity and stable coloring—high filling of conductive fillers will seriously interfere with the coloring effect of color paste, resulting in grayish and dark colors, and failing to achieve a bright and uniform appearance. This pain point has long restricted the application of high conductivity silicone rubber in wearable and consumer products.

[0003] To address the aforementioned issues, existing technologies attempt to achieve a balance between conductivity and color through various solutions: Chinese patent CN202180069739.6 discloses a primer composition for producing a light-colored conductive primer coating, containing single-walled and / or double-walled carbon nanotubes at a concentration greater than 0.005 wt.% and less than 0.1 wt.%. By preparing a single layer of light-colored conductive primer and then applying a secondary spray color, a light-colored appearance of the component can be achieved. However, this solution requires multiple layers of construction, is complex, and the primer layer and topcoat layer are prone to delamination and peeling, making it impossible to directly prepare an integrated colored highly conductive silicone rubber body. Chinese patent CN201811270301.0 discloses a conductive masterbatch for silicone rubber that uses single-walled carbon nanotubes as the conductive material in the silicone rubber compound. This masterbatch has advantages such as colorfastness, low addition amount, high and stable conductivity, high mechanical properties, and low cost. Adding 0.5-3 parts by mass can produce antistatic silicone rubber with a surface resistivity of 10⁶ to 10¹¹, which is considered antistatic, but far below 10⁶. 4 The high conductivity requirement of Ω / □ cannot meet the stringent low resistance requirements of scenarios such as muscle electrical stimulation. Chinese Patent CN202010012028.2 discloses a colored fluorosilicone rubber material with antistatic properties, prepared by mixing the following components: fluorosilicone rubber raw rubber, white carbon black, conductive filler, titanium dioxide, color powder, vulcanizing agent, etc., wherein the conductive filler is selected from at least one of single-walled carbon nanotubes, multi-walled carbon nanotubes, carbon fibers, graphene, graphene oxide, and zinc oxide whiskers. Using the method provided by this invention, the volume resistivity of the fluorosilicone rubber is 10. 6 ~10 8With a conductivity of Ω·cm, it can meet the requirements for electromagnetic shielding or antistatic applications. In addition, due to the small amount of conductive filler added and the strong covering ability of titanium dioxide, electromagnetic protection or antistatic fluorosilicone rubber materials of different colors can be obtained. However, it does not reach the high conductivity level. Furthermore, the large amount of titanium dioxide added will damage the mechanical properties and conductive network stability of silicone rubber, making it impossible to achieve high conductivity, high colorability, and excellent mechanical properties at the same time.

[0004] It is evident that existing high-conductivity silicone rubber materials are difficult to mix with color pastes alone. They require the preparation of a single layer of light-colored conductive primer before coloring, or the use of titanium dioxide to mask and alter the color depth. Furthermore, the surface resistivity of the resulting high-conductivity silicone rubber material is difficult to achieve 10-1. 4 Ω / □, and currently, existing high-conductivity silicone rubbers are generally black, which cannot meet the consumer market's demand for colorful and aesthetically pleasing products, making it difficult to achieve product differentiation. Therefore, there is an urgent need for a high-conductivity colored silicone rubber material based on carbon nanotubes. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a highly conductive colored silicone rubber material based on carbon nanotubes. This highly conductive colored silicone rubber material based on carbon nanotubes has high conductivity, excellent mechanical properties, stable coloring effect, and is not easy to fade. It can be applied to fields such as muscle stimulation and is easy to use.

[0006] The present invention provides a simple and easy-to-control method for preparing highly conductive colored silicone rubber material based on carbon nanotubes, which is conducive to large-scale industrial production. The prepared highly conductive colored silicone rubber material based on carbon nanotubes has stable quality and excellent comprehensive performance.

[0007] The objective of this invention is achieved through the following technical solution: a highly conductive colored silicone rubber material based on carbon nanotubes, comprising the following components: organosilicon raw rubber, carbon nanotube slurry, coupling agent, silica, organic pigment paste, and vulcanizing agent.

[0008] Furthermore, the carbon nanotube-based highly conductive colored silicone rubber material comprises the following components in parts by weight: 90-110 parts of organosilicon raw rubber, 15-25 parts of carbon nanotube slurry, 8-10 parts of coupling agent, 30-35 parts of silica, 2-4 parts of organic pigment paste, and 7-10 parts of vulcanizing agent.

[0009] The carbon nanotube-based high-conductivity colored silicone rubber material of the present invention is prepared by using a specific ratio of organosilicon raw rubber, carbon nanotube slurry, coupling agent, fumed silica, organic pigment paste and vulcanizing agent. The raw materials are well compatible with each other, and the resulting high-conductivity colored silicone rubber material has both high conductivity and excellent mechanical properties, as well as stable coloring effect and is not easy to fade. Specifically, organosilicon raw rubber serves as the silicone rubber matrix; carbon nanotube slurry constructs a continuous conductive network, significantly reducing the surface resistivity of the material and achieving high conductivity. The slurry morphology ensures uniform dispersion of carbon nanotubes in the rubber, avoiding performance fluctuations caused by agglomeration; silica serves as a reinforcing filler, significantly improving the tensile strength, tear strength, and abrasion resistance of the silicone rubber, compensating for the decrease in mechanical properties after the addition of carbon nanotube conductive filler; coupling agents improve the interfacial bonding between silica and carbon nanotubes and the organosilicon matrix, enhancing filler dispersibility and strengthening the stability and mechanical properties of the conductive network; organic pigment paste enables stable coloring of the material, ensuring vibrant colors without significantly affecting conductivity and mechanical properties; vulcanizing agents initiate cross-linking and curing of the silicone rubber, forming a three-dimensional network structure, imparting moldability and stability to the material, ensuring the conductive network remains continuous after cross-linking. This solves the industry pain point in existing technologies where "highly conductive silicone rubber can only be black and cannot be multi-colored," meeting the consumer market's demand for aesthetically pleasing and differentiated products, enabling multi-colored customization and enhancing product market competitiveness. It is worth noting that the raw materials of this invention are all non-metallic system raw materials, which avoids the safety hazards such as skin sensitization, heavy metal leaching, and electrochemical corrosion that exist in traditional metal conductive fillers. At the same time, it avoids the restrictions on metal raw materials in international environmental regulations such as RoHS and REACH. It not only ensures the biosafety of close-fitting use, but also meets the global market export standards, providing a reliable safety guarantee for long-term skin-tight applications such as muscle electrical stimulation.

[0010] Furthermore, the carbon nanotube slurry is a single-walled carbon nanotube slurry, wherein the mass fraction of single-walled carbon nanotube powder in the single-walled carbon nanotube slurry is 0.03-0.07%, which allows the carbon nanotubes to be uniformly dispersed in silicone rubber. It can form a highly efficient conductive network with extremely low filling amount, which improves the conductivity of the material while ensuring that its mechanical properties, processing properties and coloring effect are not affected, thus achieving synergistic optimization of conductivity, mechanical properties and appearance properties.

[0011] Furthermore, the organosilicon raw rubber is methyl vinyl silicone rubber raw rubber, which has high crosslinking activity, excellent mechanical properties, good weather resistance, and good compatibility with fillers, coupling agents, vulcanizing agents, and color pastes in the formulation. Preferably, the vinyl content in the methyl vinyl silicone rubber raw rubber is 0.03-0.5 mol%. More preferably, it is 0.07-0.12 mol%.

[0012] Furthermore, the coupling agent comprises bis(3-triethoxysilylpropyl)tetrasulfide, whose molecular structure contains both siloxane functional groups and polysulfide bonds. The siloxane functional groups can interfacially bond with the hydroxyl groups on the surface of silica and carbon nanotubes, while the polysulfide bonds can participate in the crosslinking reaction of silicone rubber, forming a synergistic effect with the vulcanizing agent. This enhances the interfacial bonding strength between the filler and the matrix, significantly improving the interfacial compatibility and bonding strength between the inorganic filler and the silicone rubber matrix, effectively improving the dispersion state of the filler in the matrix, preventing filler agglomeration, and improving the stability of the conductive network.

[0013] Furthermore, the organic pigment paste used is CMJ-1508, manufactured by Dongguan Caimijia Electronic Technology Co., Ltd. Choosing this commercially available organic pigment paste allows for precise customized coloring of silicone rubber materials, ensuring uniform color, no color difference, and no unevenness in the finished product. The organic pigment components also exhibit excellent heat resistance, minimizing issues such as pigment decomposition, discoloration, and fading during high-temperature vulcanization of rubber, thus guaranteeing the stability of the product's appearance. On the other hand, this pigment paste demonstrates excellent compatibility with components in the system, including methyl vinyl silicone rubber raw rubber, silica, and carbon nanotube slurry. Its addition does not disrupt the cross-linking network and conductive pathways of the carbon nanotubes within the rubber compound, and does not affect the material's conductivity, mechanical strength, or processing fluidity. It balances the high conductivity, mechanical properties, and coloring requirements of silicone rubber materials, and is less prone to fading during subsequent use, avoiding the problems of color fading and skin contamination associated with traditional colored silicone, thus improving the safety and comfort of long-term close-fitting use.

[0014] Furthermore, the silica is fumed silica.

[0015] Furthermore, the vulcanizing agent is dicumyl peroxide (DCP).

[0016] This invention also provides a method for preparing a highly conductive colored silicone rubber material based on carbon nanotubes, comprising the following steps: S1. At room temperature, place the silicone raw rubber on the rollers of an open two-roll mixing mill, turn on the mixing mill, and allow the raw rubber to fully coat the rollers. S2. Add fumed silica to the raw rubber after rolling in step S1 and mix until uniform. Then add carbon nanotube slurry and continue mixing for 30-60 minutes until the system is uniform. Adjust the mixing time according to the amount of filler used. S3. Pass the uniformly mixed rubber compound from step S2 through a thin pass 8-10 times to further break up residual agglomerates and increase the density of the rubber compound. Then add the coupling agent and continue mixing for 1-5 minutes to ensure that the coupling agent is fully dispersed and to achieve interface modification between the filler and the rubber compound. Then add the vulcanizing agent and pass the rubber compound through a thin pass 8-12 times. Then add the organic pigment paste for coloring and continue mixing until the rubber compound has a uniform color and no color difference. After uniform mixing, roll it out into sheets to obtain the compounded rubber. S4. Place the compound obtained in step S3 into a flat vulcanizing machine for a first vulcanization to initially form a silicone rubber semi-finished product. S5. The silicone rubber semi-finished product obtained in step S4 is transferred into an oven with a blower for two-stage vulcanization. After cooling, a silicone rubber composite material is obtained.

[0017] The present invention provides a simple and easy-to-control method for preparing highly conductive colored silicone rubber material based on carbon nanotubes, which is conducive to large-scale industrial production. The prepared highly conductive colored silicone rubber material has stable quality, high conductivity, excellent mechanical properties, stable coloring effect, and is not easy to fade, exhibiting superior overall performance.

[0018] Furthermore, the specific steps of the vulcanization process are as follows: after the mold of the flat vulcanizing machine is closed, a molding pressure of 8-12 MPa is applied, the vulcanization temperature is controlled at 150-170℃, and the vulcanization is carried out under heat and pressure for 50-70 minutes.

[0019] Furthermore, the specific steps of the two-stage vulcanization are to adjust the oven temperature to 150-170℃ and maintain the temperature for vulcanization for 110-130 minutes.

[0020] The present invention also provides an application of the above-mentioned carbon nanotube-based highly conductive colored silicone rubber material in muscle electrical stimulation.

[0021] The silicone rubber material of this invention uses methyl vinyl silicone rubber as a flexible matrix. A continuous and stable conductive pathway is constructed through a low-content single-walled carbon nanotube structure, reinforced with silica and modified with bis(3-triethoxysilylpropyl)tetrasulfide coupling. This results in a material that combines high conductivity with the flexibility to conform to the human body. During muscle electrical stimulation, the material can efficiently conduct electrical stimulation signals, precisely targeting the target muscle area and triggering muscle contraction and relaxation. Simultaneously, relying on the physiological inertness of the silicone rubber matrix, it adheres to the skin without irritation or sensitization risk, making it suitable for long-term muscle electrical stimulation applications. Furthermore, the resulting silicone rubber material is resistant to fading over time. This highly conductive colored silicone rubber material is applicable to various functional insoles, muscle electrical stimulation devices, rehabilitation therapy equipment, and flexible wearable electrical stimulation devices. Specifically, functional insoles are suitable for foot muscle electrical stimulation and foot rehabilitation applications; rehabilitation therapy equipment is suitable for postoperative muscle rehabilitation and muscle atrophy prevention; and flexible wearable electrical stimulation devices include electrical stimulation belts, armbands, and watch straps.

[0022] The beneficial effects of this invention are as follows: 1. The carbon nanotube-based high-conductivity colored silicone rubber material of the present invention is produced by using a specific ratio of organosilicon raw rubber, carbon nanotube slurry, coupling agent, fumed silica, organic pigment paste and vulcanizing agent. The raw materials are well-matched and have good compatibility. The resulting high-conductivity colored silicone rubber material has both high conductivity and excellent mechanical properties, as well as stable coloring effect and is not easy to fade. It solves the industry pain point of "high-conductivity silicone rubber can only be black and cannot be multi-colored" in the prior art, meets the consumer market's demand for aesthetic and differentiated product appearance, can realize multi-color customization of products, and enhance the market competitiveness of products.

[0023] 2. This invention uses commercially available organic pigment paste, model CMJ-1508, produced by Dongguan Caimijia Electronic Technology Co., Ltd., to ensure that the finished product has uniform color, no color difference, and no uneven coloring. It has excellent compatibility with components such as methyl vinyl silicone rubber raw rubber, silica, and carbon nanotube slurry. After addition, it will not damage the cross-linking network and carbon nanotube conductive pathway inside the rubber compound, and will not affect the conductivity, mechanical strength, and processing fluidity of the material.

[0024] 3. The preparation process of the high-conductivity colored silicone rubber material based on carbon nanotubes in this invention is simple, easy to control, and conducive to large-scale industrial production. The colored silicone rubber material obtained has stable quality and excellent comprehensive performance. Attached Figure Description

[0025] Figure 1 This is a product image of the highly conductive colored silicone rubber material based on carbon nanotubes from Example 1; Figure 2 The image shows the results of surface resistance testing of the highly conductive colored silicone rubber material based on carbon nanotubes in Example 1.

[0026] Figure 3 The image shows the results of surface resistance testing on the carbon nanotube-based highly conductive colored silicone rubber material of Comparative Example 2. Detailed Implementation

[0027] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0028] In some embodiments, the carbon nanotube-based highly conductive colored silicone rubber material comprises the following components: organosilicon raw rubber, carbon nanotube slurry, coupling agent, silica, organic pigment paste, and vulcanizing agent.

[0029] In some embodiments, the carbon nanotube-based highly conductive colored silicone rubber material comprises the following components in parts by weight: 90-110 parts of organosilicon raw rubber, 15-25 parts of carbon nanotube slurry, 8-10 parts of coupling agent, 30-35 parts of silica, 2-4 parts of organic pigment paste, and 7-10 parts of vulcanizing agent.

[0030] In some embodiments, the carbon nanotube slurry is a single-walled carbon nanotube slurry, wherein the mass fraction of single-walled carbon nanotube powder in the single-walled carbon nanotube slurry is 0.03-0.07%.

[0031] In some embodiments, the organosilicon raw rubber is methyl vinyl silicone rubber raw rubber. The vinyl content in the methyl vinyl silicone rubber raw rubber is 0.03-0.5 mol%.

[0032] In some embodiments, the coupling agent comprises bis(3-triethoxysilylpropyl)tetrasulfide.

[0033] In some embodiments, the organic pigment paste is CMJ-1508 manufactured by Dongguan Caimijia Electronic Technology Co., Ltd.

[0034] In some embodiments, the silica is fumed silica.

[0035] In some embodiments, the vulcanizing agent is dicumyl peroxide (DCP).

[0036] In other embodiments, a method for preparing a highly conductive colored silicone rubber material based on carbon nanotubes is provided, comprising the following steps: S1. At room temperature, place the silicone raw rubber on the rollers of an open two-roll mixing mill, turn on the mixing mill, and allow the raw rubber to fully coat the rollers. S2. Add silica to the raw rubber after rolling in step S1 and mix until uniform; then add carbon nanotube slurry and continue mixing for 30-60 minutes until the system is uniform. S3. Pass the rubber compound that was mixed evenly in step S2 through a thin pass 8-10 times. Then add the coupling agent and continue mixing for 1-5 minutes to ensure that the coupling agent is fully dispersed. Then add the vulcanizing agent and pass the rubber compound through a thin pass 8-12 times. Then add the organic pigment paste for coloring. After mixing evenly, roll it out into sheets to obtain the compounded rubber. S4. Place the compound obtained in step S3 into a flat vulcanizing machine for a first vulcanization to initially form a silicone rubber semi-finished product. S5. The silicone rubber semi-finished product obtained in step S4 is transferred into an oven with a blower for two-stage vulcanization. After cooling, a silicone rubber composite material is obtained.

[0037] In other embodiments, the specific steps of the vulcanization process are as follows: after the mold of the flat vulcanizing machine is closed, a molding pressure of 8-12 MPa is applied, the vulcanization temperature is controlled at 150-170°C, and the vulcanization is carried out under heat and pressure for 50-70 minutes.

[0038] In other embodiments, the specific steps of the two-stage vulcanization are to adjust the oven temperature to 150-170°C and hold the vulcanization for 110-130 minutes.

[0039] In other embodiments, an application of the above-mentioned carbon nanotube-based highly conductive colored silicone rubber material in muscle electrical stimulation is provided.

[0040] Example 1 In this embodiment, the highly conductive colored silicone rubber material based on carbon nanotubes includes the following components in parts by weight: 100 parts of organosilicon raw rubber, 20 parts of carbon nanotube slurry, 9 parts of coupling agent, 33 parts of silica, 3 parts of organic pigment paste, and 8 parts of vulcanizing agent.

[0041] Furthermore, the carbon nanotube slurry is a single-walled carbon nanotube slurry, wherein the mass fraction of single-walled carbon nanotube powder in the single-walled carbon nanotube slurry is 0.05%. In this embodiment, the single-walled carbon nanotube slurry used is TB-CWG001 manufactured by Chengdu Carbon Aurora Technology Co., Ltd.

[0042] Furthermore, the organosilicon raw rubber is methyl vinyl silicone rubber raw rubber, wherein the vinyl content in the methyl vinyl silicone rubber raw rubber is 0.07-0.12 mol.

[0043] Furthermore, the coupling agent comprises bis(3-triethoxysilylpropyl)tetrasulfide.

[0044] Furthermore, the organic pigment paste used is CMJ-1508 Phthalocyanine Blue, manufactured by Dongguan Caimijia Electronic Technology Co., Ltd.

[0045] Furthermore, the silica is fumed silica.

[0046] Furthermore, the vulcanizing agent is dicumyl peroxide.

[0047] This embodiment provides a method for preparing a highly conductive colored silicone rubber material based on carbon nanotubes, including the following steps: S1. At room temperature, place the silicone raw rubber on the rollers of an open two-roll mixing mill, turn on the mixing mill, and allow the raw rubber to fully coat the rollers. S2. Add silica to the raw rubber after rolling in step S1 and mix until uniform; then add carbon nanotube slurry and continue mixing for 45 minutes until the system is uniform. The mixing time should be adjusted according to the amount of filler used. S3. Pass the uniformly mixed rubber compound from step S2 through a thin pass 8-10 times, then add the coupling agent and continue mixing for 3 minutes to ensure that the coupling agent is fully dispersed; then add the vulcanizing agent, pass the rubber compound through a thin pass 10 times, then add the organic pigment paste for coloring, mix evenly, roll it into sheets, and obtain the compounded rubber. S4. Place the compound obtained in step S3 into a flat vulcanizing machine for a first vulcanization to initially form a silicone rubber semi-finished product. S5. The silicone rubber semi-finished product obtained in step S4 is transferred into an oven with a blower for two-stage vulcanization. After cooling, a silicone rubber composite material is obtained.

[0048] Furthermore, the specific steps of the vulcanization process are as follows: after the mold of the flat vulcanizing machine is closed, a molding pressure of 10 MPa is applied, the vulcanization temperature is controlled at 160°C, and the vulcanization is carried out under heat and pressure for 60 minutes.

[0049] Furthermore, the specific steps of the two-stage vulcanization are to adjust the oven temperature to 160°C and maintain the temperature for vulcanization for 120 minutes.

[0050] This embodiment also provides an application of the above-mentioned highly conductive colored silicone rubber material based on carbon nanotubes in muscle electrical stimulation.

[0051] Comparative Example 1 The difference between this comparative example and Example 1 is that the highly conductive colored silicone rubber material does not contain organic pigment paste.

[0052] Comparative Example 2 The difference between this comparative example and Example 1 is that an equal amount of blue organic pigment paste of model MP-1520 produced by Hongzan Rubber Raw Materials Co., Ltd. was used to replace the organic pigment paste of Example 1.

[0053] Comparative Example 3 The difference between this comparative example and Example 1 is that 3-hydroxypropyltrimethoxysilane is used to replace the bis(3-triethoxysilylpropyl)tetrasulfide in Example 1 in an equal amount.

[0054] Comparative Example 4 The difference between this comparative example and Example 1 is that the highly conductive colored silicone rubber material based on carbon nanotubes includes the following components in parts by weight: 100 parts of organosilicon raw rubber, 20 parts of carbon nanotube slurry, 9 parts of coupling agent, 33 parts of silica, 5 parts of organic pigment paste, and 8 parts of vulcanizing agent.

[0055] Performance testing The performance of the carbon nanotube-based highly conductive colored silicone rubber materials prepared in Example 1 and Comparative Examples 1-4 was tested. The surface resistivity, anti-perspiration color change, tensile properties, tear strength, Shore A hardness, compression set, abrasion volume loss, and water absorption of the carbon nanotube-based highly conductive colored silicone rubber materials were tested, and the results are shown in Table 1.

[0056] Table 1

[0057] in, Surface resistivity was measured using a surface resistivity tester.

[0058] Test of antiperspirant color change performance: Artificial sweat was prepared according to AATCC 15-2021. The highly conductive colored silicone rubber materials prepared in Example 1 and Comparative Examples 2-4 were immersed in artificial sweat at a constant temperature of 70°C for 72 hours. The total color difference ΔE of the sample surface before and after immersion was measured by spectrophotometer.

[0059] Tensile properties were tested in accordance with GB / T 528-2009.

[0060] Tear strength testing was conducted in accordance with GB / T 529-2008.

[0061] The Shore A hardness test was performed according to GB / T 39693.4-2025.

[0062] Compression set test was conducted according to GB / T 7759.1-2015, with a test temperature of 70℃ and a compression time of 22h.

[0063] Wear volume loss was determined according to GB / T 1689-2014.

[0064] The water absorption rate was determined according to GB / T 1690-2010, and the test conditions were 23℃×24h.

[0065] like Figure 1 As shown, the color of the highly conductive colored silicone rubber material prepared in Example 1 conforms to PANTONE 3262 C in the Pantone color chart, corresponding to the chromaticity parameters C:72, M:0, Y:38, K:0.

[0066] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A highly conductive colored silicone rubber material based on carbon nanotubes, characterized in that: It includes the following components: organosilicon raw rubber, carbon nanotube slurry, coupling agent, precipitated silica, organic pigment paste, and vulcanizing agent.

2. The highly conductive colored silicone rubber material based on carbon nanotubes according to claim 1, characterized in that: The composition includes the following components in parts by weight: 90-110 parts of organosilicon raw rubber, 15-25 parts of carbon nanotube slurry, 8-10 parts of coupling agent, 30-35 parts of precipitated silica, 2-4 parts of organic pigment paste, and 7-10 parts of vulcanizing agent.

3. The highly conductive colored silicone rubber material based on carbon nanotubes according to claim 1, characterized in that: The carbon nanotube slurry is a single-walled carbon nanotube slurry, wherein the mass fraction of single-walled carbon nanotube powder in the single-walled carbon nanotube slurry is 0.03-0.07%.

4. The highly conductive colored silicone rubber material based on carbon nanotubes according to claim 1, characterized in that: The organosilicon raw rubber is methyl vinyl silicone rubber raw rubber.

5. The highly conductive colored silicone rubber material based on carbon nanotubes according to claim 1, characterized in that: The coupling agent includes bis(3-triethoxysilylpropyl)tetrasulfide.

6. The highly conductive colored silicone rubber material based on carbon nanotubes according to claim 1, characterized in that: The organic pigment paste used is CMJ-1508, manufactured by Dongguan Caimijia Electronic Technology Co., Ltd.

7. The highly conductive colored silicone rubber material based on carbon nanotubes according to claim 1, characterized in that: The silica is fumed silica.

8. A method for preparing a highly conductive colored silicone rubber material based on carbon nanotubes as described in any one of claims 1-7, characterized in that: Includes the following steps: S1. At room temperature, place the silicone raw rubber on the rollers of an open two-roll mixing mill, turn on the mill, and allow the raw rubber to fully coat the rollers. S2. Add silica to the raw rubber after rolling in step S1 and mix until uniform; then add carbon nanotube slurry and continue mixing for 30-60 minutes until the system is uniform. S3. Pass the rubber compound that was mixed evenly in step S2 through a thin pass 8-10 times, then add the coupling agent and continue mixing for 1-5 minutes; then add the vulcanizing agent and pass the rubber compound through a thin pass 8-12 times; then add the organic pigment paste for coloring, mix evenly, roll it out into sheets, and obtain the compounded rubber. S4. Place the compound obtained in step S3 into a flat vulcanizing machine for a first vulcanization to initially form a silicone rubber semi-finished product. S5. The silicone rubber semi-finished product obtained in step S4 is transferred into an oven with a blower for two-stage vulcanization. After cooling, a silicone rubber composite material is obtained.

9. A method for preparing the highly conductive colored silicone rubber material based on carbon nanotubes as described in claim 8, characterized in that: The specific steps of the first stage of vulcanization are as follows: after the mold of the flat vulcanizing machine is closed, apply a molding pressure of 8-12MPa, control the vulcanization temperature at 150-170℃, and vulcanize under heat and pressure for 50-70 minutes; the specific steps of the second stage of vulcanization are as follows: adjust the oven temperature to 150-170℃ and vulcanize under heat for 110-130 minutes.

10. The application of the highly conductive colored silicone rubber material based on carbon nanotubes as described in any one of claims 1-7 in muscle electrical stimulation.

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