High-performance sealing material and preparation method thereof

Abstract

The invention provides a high-performance sealing material and a preparation method thereof, and relates to a sealing material. The high-performance sealing material comprises the following components in percentage by weight: 30-70% of a polymer material; 5%-20% of a rubber material; 1%-5% of a nano reinforcing agent; 1-3% of a nano carbon material; and 0.5%-2.0% of a graphene material. The high-performance sealing material provided by the embodiment of the invention not only has excellent hydrogen resistance, but also has excellent durability, physical performance and low-temperature performance, and also has relatively high cost performance.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to sealing materials, and in particular to a high-performance sealing material and a preparation method thereof. BACKGROUND

[0002] During the operation of hydrogen energy battery packs, the generation of hydrogen gas poses strict requirements on the hydrogen-blocking performance of sealing materials. Although organic silicone elastomer materials have certain advantages in terms of hydrogen-blocking performance, their durability and physical properties limit their application range. Fluororubber elastomers, on the other hand, have excellent temperature resistance but their performance significantly decreases in low-temperature environments, and they are relatively expensive. Therefore, in view of the special requirements of hydrogen energy battery packs, it is urgent to develop new sealing materials. Such materials need to have long-term effective hydrogen-blocking ability and maintain physical property stability under extreme temperature conditions, while also taking into account cost-effectiveness to adapt to large-scale production and application. In this research field, researchers are working to explore and develop new polymer materials with high hydrogen-blocking performance, excellent temperature resistance, and cost-effectiveness, with the aim of providing safer, more reliable, and more economical sealing solutions for hydrogen energy battery packs. SUMMARY

[0003] The embodiments of the present disclosure provide a high-performance sealing material that not only has excellent hydrogen-blocking performance but also has excellent durability, physical properties, and low-temperature performance, while also having a high cost-performance ratio.

[0004] According to a first aspect of the embodiments of the present disclosure, a high-performance sealing material is provided, which includes the following components in weight percentage:

[0005] Polymer material: 30%-70%;

[0006] Rubber material: 5%-20%;

[0007] Nano-enhancing agent: 1%-5%;

[0008] Nano-carbon material: 1-3%;

[0009] Graphene material: 0.5%-2.0%.

[0010] In one embodiment, the polymer material includes at least one of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), and polyamide (PA).

[0011] In one embodiment, the rubber material includes at least one of liquid ethylene-propylene-diene rubber and liquid silicone rubber.

[0012] In one embodiment, the nanometer reinforcing agent comprises at least one of nanometer ultra-fine powder and nanometer alumina; wherein the nanometer ultra-fine powder comprises at least one of nanometer silica modified by silane coupling agent and nanometer alumina modified by silane coupling agent.

[0013] In one embodiment, the nanometer carbon material comprises at least one of carbon nanotube and carbon fiber; wherein the carbon nanotube comprises at least one of multi-walled carbon nanotube and single-walled carbon nanotube.

[0014] In one embodiment, the graphene material comprises at least one of graphene oxide and reduced graphene oxide.

[0015] According to a second aspect of the embodiments of the present disclosure, a preparation method of high-performance sealing material is provided, which comprises the following steps:

[0016] S1, mixing a polymer material and rubber according to a preset ratio, and heating the mixture to a preset temperature to promote uniform mixing of the materials;

[0017] S2, adding a preset amount of nanometer reinforcing agent and carbon fiber material to the mixture while stirring to uniformly disperse the nanometer reinforcing agent and carbon fiber material in the mixture;

[0018] S3, adding graphene material to the mixture after step S2, and stirring until the mixture is uniform;

[0019] S4, curing the mixture after step S3 in a mold for a preset time to obtain a sealing material; wherein the curing temperature is 120-180°C;

[0020] S5, taking out the sealing material from the mold and performing size processing and quality inspection on the sealing material.

[0021] In one embodiment, the weight percentage of each component is as follows: polymer material: 30%-70%; rubber material: 5%-20%; nanometer reinforcing agent: 1%-5%; nanometer carbon material: 1-3%; graphene material: 0.5%-2.0%.

[0022] In one embodiment, the preset temperature is 90-110°C, and the preset time is 1.5-2.5h.

[0023] In one embodiment, the polymer material comprises at least one of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), and polyamide (PA);

[0024] The rubber material includes at least one of liquid ethylene-propylene-diene rubber and liquid silicone rubber.

[0025] The nano-enhancing agent includes at least one of nano-sized ultra-fine powder and nano-sized aluminum oxide; wherein the nano-sized ultra-fine powder includes at least one of silane coupling agent modified nano-sized silicon dioxide and silane coupling agent modified nano-sized aluminum oxide.

[0026] The nano-carbon material includes at least one of carbon nanotube and carbon fiber; wherein the carbon nanotube includes at least one of multi-walled carbon nanotube and single-walled carbon nanotube.

[0027] The graphene material is at least one of graphene oxide and reduced graphene oxide.

[0028] The implementation of the present disclosure includes the following technical effects:

[0029] 1. By using polyolefin material as the main body, combining with the modification of liquid ethylene-propylene-diene rubber, and filling nano-sized ultra-fine powder, carbon nanotube and graphene material, the sealing material has good durability and physical properties while maintaining excellent hydrogen barrier performance.

[0030] 2. The low-temperature performance of the material is significantly improved, the use temperature range is widened, and the problem of high cost of fluororubber elastomer material is avoided.

[0031] 3. By optimizing the vulcanization system and process, the material has excellent processing performance and physical properties, meeting the application scene requirements of hydrogen energy battery pack sealing and hydrogen barrier.

[0032] In summary, the high-performance sealing material in the embodiment of the present disclosure, through careful design of component ratio and material selection, not only has excellent mechanical properties and processing performance, but also has excellent weather resistance, chemical resistance, compression resistance and hydrogen barrier performance, which is very suitable for sealing of hydrogen energy battery pack to ensure the stability and safety of the battery pack in various environments.

[0033] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A flow chart of a high-performance sealing material and a preparation method thereof provided by the embodiment. DETAILED DESCRIPTION

[0035] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made in connection with the drawings, in which the same reference numerals designate the same elements throughout the several figures, and is made by way of a non-limiting example with reference to the embodiments described below. The following exemplary embodiments described herein represent the preferred embodiments of the present disclosure. Alternatively, however, they are not intended to limit the scope of the disclosure, which is set forth with reference to the appended claims.

[0036] The present embodiment provides a high-performance sealing material, which comprises the following components by weight percentage:

[0037] Polymer material: 30%-70%;

[0038] Rubber material: 5%-20%;

[0039] Nano-enhancing agent: 1%-5%;

[0040] Nano-carbon material: 1-3%;

[0041] Graphene material: 0.5%-2.0%.

[0042] In this embodiment, the sealing material is composed of the following specific components with fine research and quantification of weight percentage:

[0043] Polymer material, the content of which is accurately controlled between 30%-70%, serves as the base material, providing excellent mechanical properties and processing properties for the sealing material; specifically, when the content of the polymer material is 50%, the tensile strength of the material reaches the highest value. The polymer material includes polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), and polyamide (PA).

[0044] Rubber material, the content of which is optimized and determined as 5%-20%, can form good compatibility with the polymer material after modified pretreatment, thereby significantly improving the weather resistance and chemical resistance of the material; experimental data show that when the content of the rubber material is 15%, the weather resistance of the material is most significantly improved. The rubber material includes at least one of liquid ethylene-propylene-diene rubber and liquid silicone rubber.

[0045] Nano-enhancing agent, the content of which is carefully regulated as 1%-5%, can further improve the physical properties and compression resistance of the material; specifically, when the nano-enhancing agent is 3%, the hardness of the material reaches the optimum. The nano-enhancing agent includes at least one of nano-sized ultra-fine powder and nano-sized aluminum oxide, and the nano-sized ultra-fine powder includes at least one of silane coupling agent modified nano-sized silicon dioxide and silane coupling agent modified nano-sized aluminum oxide.

[0046] The nano-carbon material has a content of 1% to 3%, and the graphene material has a content of 0.5% to 2.0%, and the two materials are used as reinforcing fillers, which can significantly improve the hydrogen barrier performance and mechanical strength of the material; the experimental results show that when the content of the nano-carbon material is 2.0% and the content of the graphene material is 1%, the hydrogen barrier performance of the material is best. The nano-carbon material includes at least one of carbon nanotubes and carbon fibers; wherein the carbon nanotubes include at least one of multi-walled carbon nanotubes and single-walled carbon nanotubes, and the graphene material includes at least one of graphene oxide and reduced graphene oxide.

[0047] In addition, the high-performance sealing material provided in the present disclosure is compared and analyzed with similar materials in the prior art. For example, traditional sealing materials usually use polyethylene or polypropylene as the base material, but in contrast, the polyolefin material used in the present disclosure has higher mechanical strength and processing performance. At the same time, although attempts have been made in existing research to add silicone rubber or fluororubber to improve weather resistance, these materials often have poor compatibility with the base material, while the liquid EPDM rubber used in the present disclosure can significantly improve this problem.

[0048] In summary, through careful design of the component ratio and material selection, the high-performance sealing material of the present disclosure not only has excellent mechanical properties and processing performance, but also has excellent weather resistance, chemical resistance, compression resistance and hydrogen barrier performance, and is very suitable for sealing hydrogen energy battery packs to ensure the stability and safety of the battery pack in various environments.

[0049] The high-performance sealing material preparation method provided by the embodiment of the present disclosure includes the following steps:

[0050] S1, mixing the high molecular polymer material and the rubber according to a predetermined ratio, and heating the mixture to a predetermined temperature to promote uniform mixing of the materials;

[0051] S2, adding a predetermined amount of nano-enhancing agent and carbon fiber material to the mixture while stirring to uniformly disperse the nano-enhancing agent and carbon fiber material in the mixture;

[0052] S3, adding graphene material to the mixture after step S2, and stirring until the mixture is uniform;

[0053] S4, placing the mixture after step S3 in a mold for a predetermined time to solidify, obtaining a sealing material; wherein the solidification temperature is 120°C to 180°C;

[0054] S5, taking out the sealing material from the mold and performing size processing and quality inspection on the sealing material.

[0055] The weight percentage of each component is as follows: polymer material: 30%-70%; rubber material: 5%-20%; nano-enhancing agent: 1%-5%; nano-carbon material: 1-3%; graphene material: 0.5%-2.0%.

[0056] Preferably, the preset temperature is 90-110°C, and the preset time is 1.5-2.5h.

[0057] Preferably, the polymer material includes at least one of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), and polyamide (PA); the rubber material includes at least one of liquid ethylene-propylene-diene rubber and liquid silicone rubber; the nano-enhancing agent includes at least one of nano-sized ultra-fine powder and nano-sized aluminum oxide; the nano-sized ultra-fine powder includes at least one of silane coupling agent modified nano-sized silicon dioxide and silane coupling agent modified nano-sized aluminum oxide; the nano-carbon material includes at least one of carbon nanotube and carbon fiber; the carbon nanotube includes at least one of multi-walled carbon nanotube and single-walled carbon nanotube; and the graphene material is at least one of graphene oxide and reduced graphene oxide.

[0058] Illustratively, the high-performance sealing material preparation method provided by the embodiments of the present disclosure includes the following steps:

[0059] Step one: mix the polymer material and liquid silicone rubber in proportion, and the mixing ratio is adjusted according to specific requirements;

[0060] Step two: heat the mixture to 100°C to facilitate uniform mixing of the materials;

[0061] Step three: add nano-sized aluminum oxide and carbon fiber in sequence during stirring to ensure that they are uniformly dispersed in the mixture;

[0062] Step four: finally add the graphene material and continue stirring until the mixture reaches a uniform state;

[0063] Step five: inject the obtained mixture into a mold;

[0064] Step six: apply appropriate temperature and pressure for curing treatment, and the curing conditions are set as 150°C for 2 hours; the mold pressure is appropriately adjusted according to the fluidity of the material and the design of the mold to ensure the uniformity and dimensional accuracy of the sealing material;

[0065] Step seven: after the curing process is completed, remove the sealing material from the mold;

[0066] Step eight: perform size processing and quality inspection on the sealing material to ensure that it meets the use requirements.

[0067] The high-performance sealing material and the preparation method thereof provided in the present disclosure will be described in detail below with specific examples.

[0068] Example 1

[0069] The high-performance sealing material provided in the present example is suitable for hydrogen energy battery pack, which comprises the following components in weight percentage: polyolefin material 50%; liquid EPDM rubber 10%; nano-sized ultra-fine powder 3%; carbon nanotube 2.0%; graphene material 1%; the polyolefin material is polypropylene, the liquid EPDM rubber is EPDM rubber, the nano-sized ultra-fine powder is nano-sized silica modified by silane coupling agent, the carbon nanotube is multi-walled carbon nanotube, and the graphene material is graphene oxide.

[0070] The preparation process of the high-performance sealing material of the present example is as follows:

[0071] First, the polypropylene, EPDM rubber, nano-sized silica modified by silane coupling agent, multi-walled carbon nanotube and graphene oxide are accurately weighed according to the above weight percentage. Then, these components are uniformly mixed in a high-speed mixer to ensure that each component is fully dispersed. Next, the mixed material is sent into a twin-screw extruder for melt extrusion, and the extrusion temperature is controlled between 200-250℃ to obtain a uniform sealing material. Finally, the extruded sealing material is cooled, cut and packaged.

[0072] The high-performance sealing material obtained by the above preparation process exhibits excellent performance in tensile strength, elongation at break, gas permeability, electrical conductivity and thermal stability, and the specific test data can be seen in Table 1. Among them, the tensile strength is more than 20MPa, the elongation at break is more than 300%, the gas permeability is less than 0.1cm3 / m2·24h·0.1MPa, the electrical conductivity is less than 10^ 6 Ω·cm, and the thermal stability is more than 250℃. These performance indicators all indicate that the high-performance sealing material has a wide application prospect in hydrogen energy battery pack.

[0073] Table 1

[0074]

[0075]

[0076] According to the above Table 1, the performance test data of the high-performance sealing material prepared by the preparation method provided in the present example completely meets the relevant indicators.

[0077] Example 2:

[0078] The embodiment provides a high-performance sealing material suitable for a hydrogen energy battery pack, which comprises the following components in percentage by weight: 60% of polyolefin material; 15% of liquid EPDM rubber; 4% of nanoscale ultrafine powder; 1.5% of carbon nanotubes; and 0.5% of graphene material. The polyolefin material is polyethylene, the liquid EPDM rubber is EPDM rubber, the nanoscale ultrafine powder is nanometer alumina modified by a silane coupling agent, the carbon nanotubes are single-walled carbon nanotubes, and the graphene material is reduced graphene oxide.

[0079] The preparation process of the high-performance sealing material is as follows:

[0080] First, the polyolefin material, the liquid EPDM rubber, the nanoscale ultrafine powder, the carbon nanotubes and the graphene material are accurately weighed according to the above percentage by weight. Then, the components are uniformly mixed in a high-speed mixer to ensure that the components are fully dispersed. Then, the mixed material is sent into a twin-screw extruder for melt extrusion, and then vulcanization treatment is performed at a specific temperature and pressure to obtain the required sealing material.

[0081] Parameters: During the preparation process, the temperature of the extruder is controlled between 200 DEG C and 250 DEG C, the temperature of the vulcanization treatment is controlled between 150 DEG C and 180 DEG C, and the pressure is controlled between 10 MPa and 15 MPa. These parameters can be adjusted according to actual production needs to obtain the best sealing effect.

[0082] Performance conclusion: After testing, the high-performance sealing material has excellent corrosion resistance, high-temperature resistance and low-temperature resistance, and can meet the high requirements of the hydrogen energy battery pack on the sealing material. At the same time, the material also has good mechanical properties and processing properties, and is convenient for production and processing.

[0083] It should be noted that the content and type of each component in the above embodiment 1 and embodiment 2 can be adjusted according to actual needs to achieve the best sealing effect. For example, the content of the polyolefin material can be adjusted between 50% and 70%, the content of the liquid EPDM rubber can be adjusted between 10% and 20%, the content of the nanoscale ultrafine powder can be adjusted between 2.0% and 6%, the content of the carbon nanotubes can be adjusted between 1% and 2.0%, and the content of the graphene material can be adjusted between 0.1% and 1%.

[0084] The specific test data of the high-performance sealing material prepared by the preparation method provided in the embodiment can be seen in Table 2.

[0085] Table 2

[0086]

[0087] According to the above Table 2, the performance experimental data of the high-performance sealing material prepared by the preparation method provided in the embodiment of the present disclosure fully meets the relevant indicators.

[0088] Embodiment 3:

[0089] The high-performance sealing material suitable for hydrogen energy battery pack provided in the embodiment has the following weight percentage of components: polyimide material 50%; liquid silicone rubber 20%; nanoscale aluminum oxide 5%; carbon fiber 2.0%; and graphene material 1%.

[0090] The preparation process of the high-performance sealing material suitable for hydrogen energy battery pack provided in the embodiment is as follows:

[0091] First, the polyimide material and the liquid silicone rubber are mixed in proportion and heated to 100°C to promote uniform mixing of the materials. Then, the nanoscale aluminum oxide and the carbon fiber are added in sequence during stirring to ensure uniform dispersion. Finally, the graphene material is added, and the stirring is continued until the mixture reaches a uniform state. The obtained mixture is injected into a mold, and appropriate temperature and pressure are applied for curing treatment. The curing conditions are set to 150°C for 2 hours. After the curing process is completed, the sealing material is taken out of the mold, and size processing and quality inspection are performed.

[0092] Parameters: mixing temperature: 100°C; curing temperature: 150°C; curing time: 2 hours; mold pressure: appropriately adjusted according to the material fluidity and mold design to ensure uniformity and dimensional accuracy of the sealing material.

[0093] The specific test data of the high-performance sealing material prepared by the preparation method provided in the embodiment can be seen in Table 3.

[0094] Table 3

[0095]

[0096]

[0097] According to the above Table 3, the performance experimental data of the high-performance sealing material prepared by the preparation method provided in the embodiment of the present disclosure fully meets the relevant indicators.

[0098] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon considering the specification and practice of the present disclosure disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common general knowledge or custom in the art not specifically disclosed. The specification and embodiments are considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

Claims

1. A high performance sealing material, characterized by, The material comprises the following weight percentages of components: Polymer material: 30%-70%; Rubber material: 5%-20%; Nano-enhancing agent: 1%-5%; Nano-carbon material: 1-3%; Graphene material: 0.5%-2.0%.

2. The high performance sealing material of claim 1, wherein, The polymer material comprises at least one of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), and polyamide (PA).

3. The high performance sealing material of claim 1, wherein, The rubber material comprises at least one of liquid ethylene-propylene-diene rubber and liquid silicone rubber.

4. The high performance sealing material of claim 1, wherein, The nano-enhancing agent comprises at least one of nano-level ultra-fine powder and nano-level aluminum oxide; wherein the nano-level ultra-fine powder comprises at least one of silane coupling agent modified nano-silicon dioxide and silane coupling agent modified nano-aluminum oxide.

5. The high performance sealing material of claim 1, wherein The nano-carbon material comprises at least one of carbon nanotubes and carbon fibers; wherein the carbon nanotubes comprise at least one of multi-walled carbon nanotubes and single-walled carbon nanotubes.

6. The high performance sealing material of claim 1, wherein, The graphene material comprises at least one of graphene oxide and reduced graphene oxide.

7. A method of preparing a high performance sealing material, characterized by, The preparation method comprises the following steps: S1, mixing the high molecular polymer material with the rubber according to a predetermined ratio, and heating the mixture to a predetermined temperature to facilitate uniform mixing of the materials; S2, adding a predetermined amount of nano-enhancing agent and carbon fiber material to the mixture while stirring to uniformly disperse the nano-enhancing agent and carbon fiber material in the mixture; S3, adding graphene material to the mixture after step S2 and stirring until the mixture is uniform; S4, placing the mixture after step S3 in a mold for a predetermined time to obtain a sealing material; wherein the curing temperature is 120-180°C; S5, removing the sealing material from the mold and performing size processing and quality inspection on the sealing material.

8. The preparation method according to claim 7, characterized in that, The weight percentages of each component are as follows: polymer material: 30%-70%; rubber material: 5%-20%; nano-enhancing agent: 1%-5%; nano-carbon material: 1-3%; graphene material: 0.5%-2.0%.

9. The preparation method according to claim 7, characterized in that, The predetermined temperature is 90-110°C, and the predetermined time is 1.5-2.5h.

10. The preparation method according to claim 8, characterized in that, The polymer material comprises at least one of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), and polyamide (PA). The rubber material comprises at least one of liquid ethylene-propylene-diene rubber and liquid silicone rubber. The nano-enhancing agent comprises at least one of nano-level ultra-fine powder and nano-level aluminum oxide; wherein the nano-level ultra-fine powder comprises at least one of silane coupling agent modified nano-silicon dioxide and silane coupling agent modified nano-aluminum oxide. The nano-carbon material comprises at least one of carbon nanotubes and carbon fibers; wherein the carbon nanotubes comprise at least one of multi-walled carbon nanotubes and single-walled carbon nanotubes. The graphene material is at least one of graphene oxide and reduced graphene oxide.

Images