Low-odor modified ethylene propylene diene monomer composite material

Abstract

The invention provides a low-odor modified ethylene propylene diene monomer composite material, which is characterized in that a carbon tube-molecular sieve composite filler with different acidified single-walled carbon nanotube contents is prepared by adopting a hydrothermal method, and is used for enhancing ethylene propylene diene monomer. By optimizing the content of the single-walled carbon nanotubes in the molecular sieve, the mechanical property, the odor grade and the thermal property of the material can be remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of EPDM rubber technology, specifically to a low-odor modified EPDM rubber composite material. Background Technology

[0002] Ethylene propylene diene monomer (EPDM) rubber is widely used in various fields such as automobiles, construction, electronics, and power cables due to its excellent weather resistance, aging resistance, chemical corrosion resistance, and electrical insulation properties. For example, in the automotive industry, EPDM is widely used to manufacture components such as sealing strips, hydraulic brake seals, and ventilation ducts. However, EPDM also has some performance shortcomings. For instance, when used as automotive sealing strips, it is prone to releasing an unpleasant odor when exposed to direct sunlight or high ambient temperatures, with a high odor level that seriously affects the passenger's riding experience.

[0003] In 2011, my country issued the "Guidelines for the Evaluation of Air Quality in Passenger Cars," which stipulated the concentration requirements for eight volatile organic compounds (VOCs) in passenger cars. This demonstrates the increasingly stringent national requirements for in-vehicle air quality, forcing EPDM (Electronic Particulate Matter) to develop towards lower odor and more environmentally friendly technologies in automotive interior components.

[0004] The high odor level of EPDM is believed to be related to residual odorous ethylene and propylene monomers from incomplete polymerization or odorous vulcanizing auxiliaries used in rubber processing. To overcome this problem, researchers often adopt a high-odor vulcanizing auxiliaries replacement strategy, that is, replacing high-odor auxiliaries with low-odor or odorless vulcanizing auxiliaries, thereby achieving low-odor vulcanization of rubber. For example, Du Changze et al. of Qingdao University prepared environmentally friendly EPDM using several environmentally friendly accelerators and deodorizers. They discovered an environmentally friendly accelerator that is superior to ordinary accelerators and has a certain deodorizing effect, but it affects the positive vulcanization time. Chen Qiaona of Tianjin Zhonghe Rubber Industry Co., Ltd. prepared low-odor EPDM by using low-odor environmentally friendly raw materials and accelerators with relatively large molecular weights. Cui Shuangqing of Northeastern University prepared environmentally friendly EPDM by compounding bio-based TPO with bio-based EPDM. Zheng Hong et al. from the New Energy Development Institute of China FAW Group Corporation, in their research on the application progress of EPDM in automobiles, mentioned that OEMs use an EPDM rubber material formulation with a nitrosamine-free vulcanization accelerator system and fully adopt environmentally friendly additives and accelerators, which can achieve an odor rating of less than 3.5 (80℃, 2h). However, the above-mentioned studies mostly focus on low-odor additives and raw materials, which limits the range of additives and raw materials that can be selected.

[0005] Currently, there are no reports on research into improving the odor properties of EPDM by synthesizing molecular sieves with high porosity and high specific surface area through the principle of physical adsorption. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a low-odor modified EPDM rubber composite material.

[0007] The technical solution adopted in this invention is as follows: a low-odor modified EPDM rubber composite material, which is obtained by compounding carbon nanotube-molecular sieve composite filler in EPDM rubber, wherein the carbon nanotube-molecular sieve composite filler is obtained by compounding molecular sieve seed crystals and acidified single-walled carbon nanotubes.

[0008] Preferably, the composite mass ratio of the carbon nanotube-molecular sieve composite filler to EPDM rubber is 1:(8-12).

[0009] Preferably, the mass ratio of the molecular sieve seed crystals to the acidified single-walled carbon nanotubes is 1:(0.3-1.5).

[0010] Preferably, the preparation method of the carbon nanotube-molecular sieve composite packing includes the following steps: S1. Synthesis of molecular sieve seed crystals: Sodium aluminate and sodium hydroxide are dissolved in pure water to form solution A. Tetrapropylammonium hydroxide and pure water are added to silica sol and stirred evenly to form solution B. Solution A is added dropwise to solution B and stirred evenly to form solution C. Solution C is subjected to hydrothermal reaction at 160-200℃ for 60-80h. After washing and drying the product, it is calcined at 500-600℃ for 3-5h to obtain molecular sieve seed crystals. S2. Preparation of acidified single-walled carbon nanotube dispersion: Add single-walled carbon nanotubes to concentrated acid solution and stir to obtain mixed acid containing single-walled carbon nanotubes. Add the mixed acid to deionized water and let it stand to separate into supernatant and lower turbidity. Continue to add the lower turbidity to deionized water and let it stand to separate into layers until the pH of the lower turbidity is greater than 3. Filter and wash to obtain acidified single-walled carbon nanotubes. Disperse the acidified carbon nanotubes in deionized water to obtain acidified single-walled carbon nanotube dispersion. S3. Add molecular sieve seed crystals and deionized water to silica sol and stir evenly. Then add solution A to obtain solution D, and add acidified single-walled carbon nanotube dispersion and stir evenly to form solution E. Then pour the mixed solution E into a reaction vessel and react in an oven at 160-200℃ for 60-80h. After filtering, washing and drying the reaction product, carbon nanotube-molecular sieve composite filler is obtained.

[0011] Preferably, in step S1, the mass ratio of sodium aluminate, sodium hydroxide, tetrapropylammonium hydroxide and silica in silica sol is 1:(4.5-6.5):(28-32):(70-75).

[0012] Preferably, in step S2, the concentrated acid solution is obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of (2-4):1 and stirring at 60-80℃ for 6-8 hours.

[0013] Preferably, in step S3, the reaction product is filtered, washed until neutral, and dried at 100-140℃ for 3-5 hours to obtain carbon nanotube-molecular sieve composite packing.

[0014] Preferably, the preparation method includes the following steps: (A) After thoroughly mixing EPDM rubber and carbon nanotube-molecular sieve composite filler at 40-60℃, zinc oxide, stearic acid, vulcanizing agent and co-vulcanizing agent are added in sequence and mixed evenly to obtain compound rubber. (B) The compounded rubber is vulcanized and cured at 150-190℃ and 5-15MPa for 5-15 minutes to obtain modified EPDM rubber.

[0015] Preferably, the ratio of EPDM rubber, carbon nanotube-molecular sieve composite filler, zinc oxide, vulcanizing agent and co-vulcanizing agent is 100:(5-25):(0.5-2):(0.5-2):(1-3).

[0016] Preferably, the vulcanizing agent is bis(2,5)-5 and the vulcanizing aid is TAIC.

[0017] The beneficial effects of this invention are as follows: This invention uses a hydrothermal method to prepare carbon nanotube-molecular sieve composite fillers (ZC series) with different contents of acidified single-walled carbon nanotubes, and uses them to reinforce EPDM rubber. The morphology and composition of the composite filler are closely related. As the SWCNT content increases, spherical molecular sieves gradually disappear, the flocculent SWCNTs attached to the surface of plate-like molecular sieves increase, while the surface of crystalline molecular sieves remains smooth; at the same time, the introduction of SWCNTs significantly increases the size of molecular sieve aggregates.

[0018] In terms of mechanical properties, the addition of carbon nanotube-molecular sieve composite fillers significantly improved the tensile properties of EPDM. Especially when ZC-2 was added (containing a specific proportion of SWCNTs), the tensile properties of the composite material reached their optimal level, with tensile strength and elongation at break significantly increased by 114% and 338% respectively compared to pure EPDM. However, further increasing the SWCNT proportion had limited effect on the reinforcing effect; excessive SWCNTs even impaired material strength due to their own agglomeration, indicating that there is an optimal range for SWCNT content. Regarding odor improvement, the introduction of molecular sieves brought the odor level of EPDM between 1.5 and 3; among them, the ZC-0, ZC-1, ZC-2, ZC-3, and ZC-4 formulations even achieved an optimal odor level of 1.5. However, excessive SWCNTs in the molecular sieve can promote the formation of more crystalline molecular sieves with smaller specific surface areas, potentially affecting the adsorption performance of the molecular sieve. Regarding thermal properties, the carbon nanotube-molecular sieve composite filler itself has little impact on the heating and cooling processes of EPDM, but the addition of SWCNTs significantly increases the maximum temperature achievable by the composite material and its heating rate. This is mainly due to the excellent thermal conductivity of SWCNTs and the enhanced interfacial bonding after compositing with the molecular sieve, thereby improving the overall thermal conductivity of EPDM. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0020] Figure 1 SEM images of the carbon nanotube-molecular sieve composite packings prepared in Comparative Example 1 and Examples 1-5 of this invention; Figure 2 The tensile cross-sectional views are of the modified EPDM rubber composite materials prepared in Comparative Example 1 and Examples 1-5 of this invention. Figure 3 Thermal management performance of the modified EPDM rubber composite material prepared in Comparative Example 1 and Examples 1-5 of the present invention: (a) Thermal infrared images during heating and cooling processes, (b) Heating curve, (c) Cooling curve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Example 1 This embodiment provides a method for preparing a low-odor modified EPDM rubber composite material, which includes the following steps: S1. Synthetic molecular sieve seed crystals: 0.41g of sodium aluminate (SA) and 2.2g of sodium hydroxide (NaOH) were dissolved in 50g of pure water to form solution A. Then, 12.7g of tetrapropylammonium hydroxide (TPAOH) and 100g of pure water were weighed and added to 100g of 30% silica sol, and stirred until homogeneous to form solution B. Solution A was slowly added dropwise to solution B, and stirring was continued for 24 hours to ensure homogeneous mixing, forming solution C. The homogeneous solution C was poured into a stainless steel reactor lined with polytetrafluoroethylene (PTFE), sealed, and placed in an oven at 180℃ for hydrothermal reaction for 72 hours. After the reactor was removed and cooled to room temperature, it was opened, and the solution inside was filtered and washed with deionized water until neutral. It was then dried in an oven at 120℃ for 4 hours, and finally calcined in a tube furnace at 550℃ for 4 hours to burn off the template agent, ultimately obtaining molecular sieve seed crystals.

[0023] S2. Preparation of carbon nanotube dispersion: 3g of single-walled carbon nanotubes were added to a concentrated acid solution (V concentrated sulfuric acid:V concentrated nitric acid = 3:1). The solution was magnetically stirred in a constant temperature water bath at 70℃ for 7h to obtain a mixed acid containing single-walled carbon nanotubes. The mixed acid was slowly added to a large amount of deionized water. After standing for 24h, the supernatant was discarded. This process was repeated until the pH of the turbid liquid was greater than 3. The solution was then filtered and washed until neutral. An acidified single-walled carbon nanotube deposition layer was obtained on filter paper. Using a wash bottle, the acidified single-walled carbon nanotube deposition layer was washed into a beaker with 100g of deionized water. The solution was sonicated for 1h to disperse the carbon nanotubes evenly, thus obtaining an acidified single-walled carbon nanotube dispersion.

[0024] S3. Synthetic carbon nanotube-molecular sieve composite packing: Weigh 0.5g of molecular sieve seed crystals and 100g of deionized water and add them to 100g of silica sol with a content of 30%, stirring until homogeneous to form solution D. Slowly add solution A dropwise to solution D while stirring, and add 5g of carbon nanotube dispersion, stirring for 24h to homogeneously form solution E. Then pour the mixed solution E into a reaction vessel lined with polytetrafluoroethylene and react in an oven at 180℃ for 72h. Finally, wash the molecular sieve after the reaction is complete with pure water by vacuum filtration until neutral, and then dry it in an oven at 120℃ for 4h to obtain the carbon nanotube-molecular sieve composite filler, named ZC-1.

[0025] S4. Preparation of modified EPDM rubber: 10 phr of carbon nanotube-molecular sieve composite filler and 100 phr of ethylene propylene diene monomer (EPDM) rubber were mixed in a two-roll mill at 50°C and a roller speed of 25 rpm for 15 min. After ZC and EPDM were fully mixed, 3 phr of zinc oxide (ZnO), 1 phr of stearic acid, 1 phr of vulcanizing agent bis(2,5-diphenyltrimethylammonium chloride), and 2 phr of co-vulcanizing agent TAIC were added sequentially, and the mixture was mixed for 15 min before sheeting to obtain the compound. Then, it was cured by pressing at 10 MPa for 10 min on a flat vulcanizing machine at 170°C to obtain the EPDM / ZC-1 composite material.

[0026] Example 2 The only difference between this embodiment and Embodiment 1 is that in step S3, 10g of carbon nanotube dispersion is added to form solution E, and the resulting carbon nanotube-molecular sieve composite filler is named ZC-2. The modified EPDM rubber obtained in step S4 is named EPDM / ZC-2.

[0027] Example 3 The difference between this embodiment and Embodiment 1 is that in step S3, 15g of carbon nanotube dispersion is added to form solution E, and the resulting carbon nanotube-molecular sieve composite filler is named ZC-3. The modified EPDM rubber obtained in step S4 is named EPDM / ZC-3.

[0028] Example 4 The difference between this embodiment and Embodiment 1 is that in step S3, 20g of carbon nanotube dispersion is added to form solution E, and the resulting carbon nanotube-molecular sieve composite filler is named ZC-4. The modified EPDM rubber obtained in step S4 is named EPDM / ZC-4.

[0029] Example 5 The difference between this embodiment and Embodiment 1 is that in step S3, 25g of carbon nanotube dispersion is added to form solution E, and the resulting carbon nanotube-molecular sieve composite filler is named ZC-5. The modified EPDM rubber obtained in step S4 is named EPDM / ZC-5.

[0030] Comparative Example 1 The difference between this comparative example and Example 1 is that in step S3, carbon nanotube dispersion is not added to form solution E, and the resulting molecular sieve packing is named ZC-0. In step S4, the 10 phr carbon nanotube-molecular sieve composite packing is replaced with 10 phr molecular sieve packing ZC-0, and the resulting modified EPDM rubber is named EPDM / ZC-0.

[0031] Morphology and performance characterization The microstructure and cross-sectional morphology of different carbon nanotube-molecular sieve composite fillers were characterized using scanning electron microscopy. Tensile strength, elongation at break, stress at 100% elongation, and stress at 300% elongation were tested using a universal testing machine according to GB / T 528-2009. The thermal management properties of the composite material were tested using a stainless steel hot stage and an infrared camera. According to PV3000:2000-08 standard, different samples were sealed in glass bottles and heated in an oven at 80℃ for 2 hours. After removal, the bottle caps were opened, and five people assessed the odor level; the average value was taken.

[0032] 1. Characterization of packing morphology The microstructure and morphology of molecular sieves with different single-walled carbon nanotube contents were characterized by scanning electron microscopy, and the results are as follows: Figure 1 As shown, without the addition of carbon nanotubes, the ZC-0 molecular sieve exhibits three forms: plate-like, spherical, and crystalline. With the addition of carbon nanotubes, the spherical molecular sieves disappear, and the surface of the plate-like molecular sieves becomes covered with flocculent carbon nanotubes, with the flocculent structure gradually increasing with increasing carbon nanotube content. The crystalline molecular sieve, however, shows poor adsorption capacity for carbon nanotubes and has a relatively smooth surface. Furthermore, compared to ZC-0, the addition of carbon nanotubes significantly increases the size of the molecular sieve.

[0033] 2. Characterization of the mechanical properties of modified EPDM rubber Table 1 shows that the addition of composite fillers significantly improves the tensile properties of EPDM. In particular, the addition of ZC-2 maximizes the tensile strength, stress at 100% elongation, stress at 300% elongation, and elongation at break of EPDM. Specifically, the tensile strength and elongation at break are increased by 114% and 338% respectively compared to the unfilled EPDM. With further increases in the proportion of carbon nanotubes, the reinforcing effect becomes limited, indicating that there is a suitable range for carbon nanotube content. Adding too much can actually negatively impact strength due to carbon nanotube agglomeration. Figure 2 It can be seen that the cross-sections of the tensile specimens all exposed molecular sieve particles of various shapes and the pits left after the particles were pulled out. Among them, the particles in EPDM / ZC-0 were smaller and more uniformly distributed. With the increase of carbon nanotube content, the molecular sieves agglomerated and clumped together, increasing the size of the filler and reducing the amount of filler, thus limiting the further improvement of mechanical strength.

[0034] Table 1 Mechanical properties of modified EPDM rubber 3. Odor Characterization of Modified EPDM Rubber According to the PV3000:2000-08 standard, odor is classified into six levels: Level 1 - Odorless, barely perceptible; Level 2 - Slight gaseous odor, perceptible but not pungent; Level 3 - Distinct odor, easily identifiable, but not pungent or unpleasant; Level 4 - Distinct odor, unpleasant, relatively strong; Level 5 - Strongly pungent odor, offensive, very strong; Level 6 - Unbearable odor. To investigate the effect of molecular sieve addition on the odor characteristics of EPDP, equal amounts of samples were placed in a sealed, odorless glass bottle and heated in an oven at 80°C for 2 hours. Five odor evaluators then assessed the odor, and the average value was taken as the test result. The data obtained using the above method are shown in Table 2.

[0035] Table 2 Odor Evaluation Table for EPDM / ZC As shown in Table 3, the addition of molecular sieves can effectively improve the odor characteristics of EPDM, keeping its odor level within a narrow range of 1.5-3. Even the addition of ZC-0, ZC-1, ZC-2, ZC-3, and ZC-4 can achieve the ideal odor level of 1.5. This is because molecular sieves have a large specific surface area and numerous complex pore structures, selectively adsorbing small-molecule polar odor substances in the vehicle interior through physical adsorption and surface electrostatic fields, achieving efficient odor removal. However, excessive carbon nanotube content may affect the odor adsorption of molecular sieves. For example, the addition of ZC-5 actually raised the odor level of EPDM to nearly 3. This is because the addition of too many carbon nanotubes increases the amount of crystalline molecular sieves, which have less contact area, thus reducing their ability to adsorb volatile organic compounds.

[0036] 4. Thermal property characterization of modified EPDM rubber To investigate the effect of composite fillers on the thermal management performance of EPDM, the temperature rise and fall curves and thermal infrared images of the samples were tested and recorded using a precision stainless steel hot plate and an infrared imager. The results are as follows: Figure 3 As shown in the figure, the addition of molecular sieves has a limited effect on the heating and cooling curves of EPDM, but the carbon nanotube content increases the maximum temperature that the EPDM composite material can reach, and also increases the heating rate of the sample to some extent. This can be attributed to the good thermal conductivity of carbon nanotubes. The combination of carbon nanotubes and molecular sieves can increase the bonding between the molecular sieves and EPDM, thus increasing the thermal conductivity of EPDM.

[0037] This invention employs a hydrothermal method to prepare carbon nanotube-molecular sieve composite fillers (ZC series) with varying contents of acidified single-walled carbon nanotubes, and then uses them to reinforce EPDM rubber. The morphology and composition of the composite filler are closely related. As the SWCNT content increases, spherical molecular sieves gradually disappear, the amount of flocculent SWCNTs adhering to the surface of plate-like molecular sieves increases, while the surface of crystalline molecular sieves remains smooth. Simultaneously, the introduction of SWCNTs significantly increases the size of the molecular sieve aggregates.

[0038] In terms of mechanical properties, the addition of carbon nanotube-molecular sieve composite fillers significantly improved the tensile properties of EPDM. Especially when ZC-2 was added (containing a specific proportion of SWCNTs), the tensile properties of the composite material reached their optimal level, with tensile strength and elongation at break significantly increased by 114% and 338% respectively compared to pure EPDM. However, further increasing the SWCNT proportion had limited effect on the reinforcing effect; excessive SWCNTs even impaired material strength due to their own agglomeration, indicating that there is an optimal range for SWCNT content. Regarding odor improvement, the introduction of molecular sieves brought the odor level of EPDM between 1.5 and 3; among them, the ZC-0, ZC-1, ZC-2, ZC-3, and ZC-4 formulations even achieved an optimal odor level of 1.5. However, excessive SWCNTs in the molecular sieve can promote the formation of more crystalline molecular sieves with smaller specific surface areas, potentially affecting the adsorption performance of the molecular sieve. Regarding thermal properties, the carbon nanotube-molecular sieve composite filler itself has little impact on the heating and cooling processes of EPDM, but the addition of SWCNTs significantly increases the maximum temperature achievable by the composite material and its heating rate. This is mainly due to the excellent thermal conductivity of SWCNTs and the enhanced interfacial bonding after compositing with the molecular sieve, thereby improving the overall thermal conductivity of EPDM.

[0039] In summary, by adjusting the composite ratio of SWCNT and molecular sieve, the mechanical properties, odor characteristics and thermal conductivity of EPDM can be synergistically optimized to a certain extent. Among them, ZC-2 shows outstanding performance in mechanical enhancement, while low-SWCNT or SWCNT-free formulations have a greater advantage in odor control.

[0040] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A low-odor modified EPDM rubber composite material, characterized in that: It is obtained by compounding carbon nanotube-molecular sieve composite filler in EPDM rubber, wherein the carbon nanotube-molecular sieve composite filler is obtained by compounding molecular sieve seed crystals and acidified single-walled carbon nanotubes.

2. The low-odor modified EPDM rubber composite material according to claim 1, characterized in that: The composite mass ratio of the carbon nanotube-molecular sieve composite filler and EPDM rubber is 1:(8-12).

3. The low-odor modified EPDM rubber composite material according to claim 1, characterized in that: The mass ratio of the molecular sieve seed crystals to the acidified single-walled carbon nanotubes is 1:(0.3-1.5).

4. The low-odor modified EPDM rubber composite material according to claim 1, characterized in that: The preparation method of the carbon nanotube-molecular sieve composite packing includes the following steps: S1. Synthesis of molecular sieve seed crystals: Sodium aluminate and sodium hydroxide are dissolved in pure water to form solution A. Tetrapropylammonium hydroxide and pure water are added to silica sol and stirred evenly to form solution B. Solution A is added dropwise to solution B and stirred evenly to form solution C. Solution C is subjected to hydrothermal reaction at 160-200℃ for 60-80h. After washing and drying the product, it is calcined at 500-600℃ for 3-5h to obtain molecular sieve seed crystals. S2. Preparation of acidified single-walled carbon nanotube dispersion: Add single-walled carbon nanotubes to concentrated acid solution and stir to obtain mixed acid containing single-walled carbon nanotubes. Add the mixed acid to deionized water and let it stand to separate into supernatant and lower turbidity. Continue to add the lower turbidity to deionized water and let it stand to separate into layers until the pH of the lower turbidity is greater than 3. Filter and wash to obtain acidified single-walled carbon nanotubes. Disperse the acidified carbon nanotubes in deionized water to obtain acidified single-walled carbon nanotube dispersion. S3. Add molecular sieve seed crystals and deionized water to silica sol and stir evenly. Then add solution A to obtain solution D, and add acidified single-walled carbon nanotube dispersion and stir evenly to form solution E. Then pour the mixed solution E into a reaction vessel and react in an oven at 160-200℃ for 60-80h. After filtering, washing and drying the reaction product, carbon nanotube-molecular sieve composite filler is obtained.

5. The low-odor modified EPDM rubber composite material according to claim 4, characterized in that: In step S1, the mass ratio of sodium aluminate, sodium hydroxide, tetrapropylammonium hydroxide and silica in silica sol is 1:(4.5-6.5):(28-32):(70-75).

6. The low-odor modified EPDM rubber composite material according to claim 4, characterized in that: In step S2, the concentrated acid solution is obtained by mixing concentrated sulfuric acid and concentrated nitric acid in a volume ratio of (2-4):1 and stirring at 60-80℃ for 6-8 hours.

7. The low-odor modified EPDM rubber composite material according to claim 4, characterized in that: In step S3, the reaction product is filtered, washed until neutral, and dried at 100-140℃ for 3-5 hours to obtain carbon nanotube-molecular sieve composite packing.

8. A low-odor modified EPDM rubber composite material according to any one of claims 1-7, characterized in that, Its preparation method includes the following steps: (A) After thoroughly mixing EPDM rubber and carbon nanotube-molecular sieve composite filler at 40-60℃, zinc oxide, stearic acid, vulcanizing agent and co-vulcanizing agent are added in sequence and mixed evenly to obtain compound rubber. (B) The compounded rubber is vulcanized and cured at 150-190℃ and 5-15MPa for 5-15 minutes to obtain modified EPDM rubber.

9. The low-odor modified EPDM rubber composite material according to claim 8, characterized in that: The ratio of EPDM rubber, carbon nanotube-molecular sieve composite filler, zinc oxide, vulcanizing agent and co-vulcanizing agent is 100:(5-25):(0.5-2):(0.5-2):(1-3).

10. The low-odor modified EPDM rubber composite material according to claim 8, characterized in that: The vulcanizing agent is bis(2,5)-5, and the vulcanizing aid is TAIC.

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