A high-damping, low-creep composite foamed material for gymnastics mats and a preparation process thereof

Abstract

The application relates to a high-damping and low-creep composite foaming material for gymnastics mats and a preparation process thereof, and relates to the field of polymer materials and preparation thereof. The preparation raw materials comprise the following components in mass fractions: ethylene-octene copolymer 60-70 parts, thermoplastic vulcanized rubber 15-25 parts, nano reinforcing filler 4-8 parts, maleic anhydride grafted ethylene-octene copolymer 5-9 parts, composite foaming agent 2-4 parts, crosslinking agent 1-2 parts, and antioxidant 1-1.5 parts. The preparation process comprises the following steps: melting and blending ethylene-octene copolymer, thermoplastic vulcanized rubber and maleic anhydride grafted ethylene-octene copolymer, adding nano reinforcing filler, mixing and kneading, then adding crosslinking agent, composite foaming agent and antioxidant, mixing and kneading, discharging and obtaining a sheet, crosslinking and foaming the sheet, releasing pressure after pressure maintaining, cooling and opening the mold, and obtaining the high-damping and low-creep composite foaming material for gymnastics mats. The application has the effects of improving the material collapse resistance, buffering performance and comfort performance.

Description

Technical Field

[0001] This application relates to the field of polymer materials and their preparation, and in particular to a high-damping, low-creep composite foam material for a manicure pad and its preparation process. Background Technology

[0002] In the field of gymnastics, the gymnastics mat is an indispensable piece of equipment. With the continuous development of gymnastics, the performance requirements for gymnastics mats are also increasing. The quality and performance of the gymnastics mat directly affect the athlete's user experience and safety during exercise. A high-quality gymnastics mat can provide athletes with better support and cushioning, helping them perform at a higher level. At the same time, with people placing greater emphasis on health and exercise, the popularity of gymnastics is increasing, and the market demand for gymnastics mats is also constantly growing.

[0003] Traditional gymnastics mats are often made of materials such as EVA and VPE. These materials primarily rely on their elasticity to meet the cushioning and support needs of gymnastics. When athletes land on the mat during tumbling, jumping, or other movements, the material absorbs energy through elastic deformation and then releases it, allowing the athlete to complete the movement smoothly. In addition, to enhance the performance of gymnastics mats, conventional foaming processes are used to adjust the material's density and pore structure to achieve varying degrees of cushioning and support.

[0004] However, traditional EVA and VPE gymnastics mats have significant drawbacks. After prolonged use, these mats are prone to permanent deformation, meaning they collapse. Furthermore, their energy rebound is too rapid; during use, this rapid rebound can cause significant impact on the joints, potentially leading to joint discomfort and posing a risk to the athletes' health. Therefore, improvements are needed. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a composite foam material for high-damping, low-creep maneuvering pads and its preparation process.

[0006] This application provides a high-damping, low-creep composite foam material for a manicure pad and its preparation process, which adopts the following technical solution: In a first aspect, this application provides a composite foam material for high-damping, low-creep maneuvering pads, employing the following technical solution: A high-damping, low-creep composite foam material for a manicure pad, the raw materials for which are prepared include the following components in parts by weight: 60-70 parts of ethylene-octene copolymer 15-25 parts of thermoplastic vulcanized rubber 4-8 parts of nano-reinforcing filler 5-9 parts of maleic anhydride-grafted ethylene-octene copolymer 2-4 parts of compound foaming agent 1-2 parts of crosslinking agent Antioxidant 1-1.5 parts.

[0007] Maleic anhydride-grafted ethylene-octene copolymer, acting as an interfacial compatibilizer, promotes the bonding between the continuous and dispersed phases, enabling the stable formation of an "island structure" with highly elastic ethylene-octene copolymer as the continuous phase and highly damping thermoplastic vulcanizate as the dispersed phase. This structure is the foundation for the material to simultaneously achieve good resilience and energy absorption. The added crosslinking agent constructs a three-dimensional network within the material, enhancing its dimensional stability and resistance to permanent deformation. The introduction of nano-reinforcing fillers further restricts the slippage of polymer molecular chains, strengthening the network support. The composite foaming agent forms uniform cells during processing; these closed cells can buffer and disperse stress through deformation upon impact. The addition of antioxidants helps maintain the stability of the above structure during processing and use. The synergistic effect of these components enhances the material's resistance to collapse, impact cushioning performance, and user comfort.

[0008] Preferably, the nano-reinforcing filler comprises organic nano-montmorillonite and mica.

[0009] The layered structure of organic nano-montmorillonite effectively restricts the movement of molecular chains within the polymer matrix, thereby enhancing the material's resistance to long-term compressive deformation. Mica, as a micron-scale sheet-like filler, works physically with organic nano-montmorillonite to enhance the overall stiffness and dimensional stability of the material, jointly contributing to improved collapse resistance. Simultaneously, these dispersed rigid layers can generate a more complex stress field upon impact, interfering with and dissipating impact energy, increasing the material's internal friction, and thus improving cushioning performance. This improved energy dissipation mechanism makes the rebound process after impact more gentle, reducing the harshness during use and improving user comfort.

[0010] Preferably, the mass ratio of the organic nano-montmorillonite to mica is 1:(1-1.5).

[0011] The above-mentioned ratio of compound fillers creates a beneficial synergistic effect between the two different dimensional lamellar fillers. Organic nano-montmorillonite, with its nanoscale lamellar structure, can deeply penetrate and effectively restrict the movement of polymer molecular chains, thereby enhancing the material's inherent ability to resist permanent deformation. Mica, as a micron-scale lamellar reinforcement, works in conjunction with organic nano-montmorillonite to construct a multi-scale reinforcing network, improving the overall dimensional stability and support of the material. The above ratio ensures that the two fillers are uniformly dispersed and mutually complementary in the matrix, avoiding agglomeration or interfacial weaknesses that may result from excessive amounts of a single filler. This allows the material to buffer energy through a more complex internal stress transmission and dissipation mechanism when subjected to impact. This optimized composite filler structure collectively improves the final product's collapse resistance, cushioning performance, and comfort during long-term use.

[0012] Preferably, the nano-reinforcing filler is modified and prepared using the following steps: The nano-reinforcing filler was added to an ethanol aqueous solution and ultrasonically dispersed to obtain a dispersion. γ-aminopropyltriethoxysilane was added to the dispersion to adjust the pH of the solution to acidic. The solution was heated and stirred under reflux. After the reaction was completed, the mixture was filtered, washed, dried, ground, and sieved to obtain the modified nano-reinforcing filler.

[0013] By modifying the nano-reinforcing filler with a silane coupling agent, organic functional groups were introduced onto its surface, improving the compatibility and interfacial bonding between the filler and the polymer matrix. The modified filler achieved more uniform dispersion in the matrix, reducing defects caused by agglomeration. This improved dispersion and strengthened interfacial bonding enabled the filler to more effectively restrict the slippage of polymer molecular chains, thereby enhancing the material's resistance to compressive deformation. Simultaneously, the uniformly dispersed rigid filler particles could more fully induce and interfere with the internal stress field, promoting the dissipation of impact energy and improving the material's cushioning performance. Overall, the optimized bonding between the filler and the matrix synergistically improved the material's dimensional stability and energy absorption characteristics, resulting in a final product with better collapse resistance, cushioning, and user comfort.

[0014] Preferably, the mass ratio of the nano-reinforcing filler to γ-aminopropyltriethoxysilane is 1:(0.015-0.025).

[0015] By controlling the mass ratio of nano-reinforcing filler to γ-aminopropyltriethoxysilane within the aforementioned range, it is ensured that the coupling agent molecules can fully undergo hydrolysis and condensation reactions on the filler surface to form a suitable organic coating layer, thereby improving the chemical bonding and interfacial compatibility between the filler and the polymer matrix. The filler treated with this ratio exhibits improved dispersion uniformity in the matrix, reduced agglomeration, and a stronger interfacial bond between the filler and the matrix, thus enhancing the material's resistance to collapse, cushioning performance, and user comfort.

[0016] Preferably, the raw materials for preparation also include ethylene-vinyl acetate elastomer.

[0017] The vinyl acetate segments in the ethylene-vinyl acetate elastomer introduce polarity, increasing the interaction between molecular chains and thus improving the overall internal friction and damping characteristics of the material. This enhanced damping helps to convert more impact kinetic energy into heat energy for dissipation, allowing the material to respond more gently when subjected to impact. At the same time, its flexible molecular chain structure can be well compatible with and participate in the main elastomer network, helping to maintain the integrity of the material structure. The addition of this component synergistically optimizes the material's energy dissipation mechanism and dynamic mechanical behavior, thereby improving the product's cushioning performance and user comfort at a comprehensive level.

[0018] Preferably, the amount of the ethylene-vinyl acetate elastomer added is 10-15 parts.

[0019] The aforementioned amount of ethylene-vinyl acetate elastomer can fully integrate into and modify the main polymer network, increasing the entanglement and interaction between molecular chains, thereby improving the overall energy dissipation capacity of the material. At the same time, this amount balances the flexibility and polarity introduced by the elastomer, which not only enhances the viscous response of the material under dynamic load, making its impact buffering process more gentle, but also avoids interference with the integrity of the continuous phase structure and mechanical support of the material that may be caused by excessive addition, thus synergistically improving the material's collapse resistance, buffering performance and user comfort.

[0020] Preferably, the crosslinking agent includes dicumyl peroxide and triallyl isocyanurate.

[0021] Dicumyl peroxide, acting as a crosslinking initiator, decomposes under heating conditions to generate free radicals, initiating carbon-carbon crosslinking between polymer molecular chains. Triallyl isocyanurate, as a multifunctional co-crosslinking agent, contains multiple unsaturated bonds that can react with multiple polymer free radicals simultaneously, thereby improving the efficiency of the crosslinking reaction and the density and uniformity of the crosslinking network. This synergistic effect forms a more stable and regular three-dimensional network structure, which can more effectively restrict the slippage and permanent deformation of molecular chains, thereby improving the material's resistance to collapse. At the same time, a moderately crosslinked network also provides a good basis for elastic recovery and helps maintain the stability of the cell structure, synergistically improving the material's cushioning performance and user comfort.

[0022] Preferably, the mass ratio of dicumyl peroxide to triallyl isocyanurate is 1:(1-1.4).

[0023] By limiting the mass ratio of dicumyl peroxide to triallyl isocyanurate within the aforementioned range, the formation of the crosslinking network was optimized. This facilitated the synergistic effect of dicumyl peroxide as the main crosslinking agent and triallyl isocyanurate as a multifunctional co-crosslinking agent, promoting the formation of a three-dimensional network structure with moderate and uniform crosslinking density. This network effectively restricts the slippage of polymer molecular chains, thereby improving the material's resistance to collapse under long-term compressive deformation. Simultaneously, the moderate and uniform crosslinking structure provides the material with a good elastic recovery basis and structural stability, enabling the material to absorb and disperse energy through controlled deformation when subjected to impact, thus improving its cushioning performance. This stable network structure also ensures the maintenance of the material's performance during long-term use, thereby enhancing user comfort.

[0024] Secondly, this application provides a preparation process for a composite foam material for high-damping, low-creep maneuvering pads, employing the following technical solution: A preparation process for a composite foam material for high-damping, low-creep maneuvering pads includes the following steps: Ethylene-octene copolymer, thermoplastic vulcanized rubber, and maleic anhydride-grafted ethylene-octene copolymer are melt-blended, and nano-reinforcing fillers are added. After mixing, crosslinking agent, composite foaming agent, and antioxidant are added, and the mixture is mixed and sheeted to obtain a sheet material. The sheet material is then crosslinked and foamed, and after pressure holding, it is depressurized, cooled, and molded to obtain a composite foam material for high-damping, low-creep maneuvering pads.

[0025] By optimizing the sequence of steps and controlling the conditions, the synergistic function of each component and the effective construction of the structure were achieved. First, ethylene-octene copolymer, thermoplastic vulcanized rubber, and maleic anhydride-grafted ethylene-octene copolymer were melt-blended to promote the full integration of the matrix resin and the interfacial compatibilizer, laying the foundation for the formation of a stable "island structure". Then, nano-reinforcing fillers were added and mixed, and the melt state at this time promoted the dispersion of the fillers in the matrix. Crosslinking agent, composite foaming agent, and antioxidant were added at a suitable temperature and mixed and sheeted. This step took into account both the uniform dispersion of heat-sensitive additives and processing safety. Finally, through the crosslinking foaming process, the decomposition of the foaming agent, the expansion of gas, and the crosslinking reaction of the polymer occurred simultaneously, thereby forming a composite foam with strong internal bonding and uniform cell structure. The entire process improved the compatibility between the components, the dispersion effect of the fillers, and the uniformity and stability of the foamed crosslinking structure, thereby synergistically improving the collapse resistance, cushioning performance, and user comfort of the final material.

[0026] In summary, this application includes at least one of the following beneficial technical effects: Maleic anhydride-grafted ethylene-octene copolymer, acting as an interfacial compatibilizer, promotes the bonding between the continuous and dispersed phases, enabling the stable formation of an "island structure" with highly elastic ethylene-octene copolymer as the continuous phase and highly damping thermoplastic vulcanizate as the dispersed phase. This structure is the foundation for the material to simultaneously achieve good resilience and energy absorption. The added crosslinking agent constructs a three-dimensional network within the material, enhancing its dimensional stability and resistance to permanent deformation. The introduction of nano-reinforcing fillers further restricts the slippage of polymer molecular chains, strengthening the network support. The composite foaming agent forms uniform cells during processing; these closed cells can buffer and disperse stress through deformation upon impact. The addition of antioxidants helps maintain the stability of the above structure during processing and use. The synergistic effect of these components enhances the material's resistance to collapse, impact cushioning performance, and user comfort.

[0027] By modifying the nano-reinforcing filler with a silane coupling agent, organic functional groups were introduced onto its surface, improving the compatibility and interfacial bonding between the filler and the polymer matrix. The modified filler achieved more uniform dispersion in the matrix, reducing defects caused by agglomeration. This improved dispersion and strengthened interfacial bonding enabled the filler to more effectively restrict the slippage of polymer molecular chains, thereby enhancing the material's resistance to compressive deformation. Simultaneously, the uniformly dispersed rigid filler particles could more fully induce and interfere with the internal stress field, promoting the dissipation of impact energy and improving the material's cushioning performance. Overall, the optimized bonding between the filler and the matrix synergistically improved the material's dimensional stability and energy absorption characteristics, resulting in a final product with better collapse resistance, cushioning, and user comfort.

[0028] The vinyl acetate segments in the ethylene-vinyl acetate elastomer introduce polarity, increasing the interaction between molecular chains and thus improving the overall internal friction and damping characteristics of the material. This enhanced damping helps to convert more impact kinetic energy into heat energy for dissipation, allowing the material to respond more gently when subjected to impact. At the same time, its flexible molecular chain structure can be well compatible with and participate in the main elastomer network, helping to maintain the integrity of the material structure. The addition of this component synergistically optimizes the material's energy dissipation mechanism and dynamic mechanical behavior, thereby improving the product's cushioning performance and user comfort at a comprehensive level. Detailed Implementation

[0029] This application discloses a high-damping, low-creep composite foam material for a handgrip and its preparation process. Unless otherwise specified, all raw materials used in this application are commercially available. The following detailed description, in conjunction with embodiments, further illustrates this application: Raw material description: Ethylene-octene copolymer ENGAGE™ 8180 was purchased from Shanghai Muying Trading Co., Ltd., and thermoplastic vulcanizate Elastron V... PV101.A40.N was purchased from Dongguan Tianzhihong Plastics Co., Ltd.; organic nano-montmorillonite TY-710C and mica were purchased from Tuoyi New Materials (Guangzhou) Co., Ltd.; maleic anhydride-grafted ethylene-octene copolymer VA1202 was purchased from Yucheng (Hongji) Plastics Dongguan Co., Ltd.; azodicarbonamide (CAS No.: 123-77-3), 4,4'-oxobisbenzenesulfonyl hydrazine (CAS No.: 80-51-3), dicumyl peroxide (CAS No.: 80-43-3), triallyl isocyanurate (CAS No.: 1025-15-6), antioxidant 1076 and antioxidant 168 were purchased from Changzhou Youfeng Chemical Co., Ltd.; γ-aminopropyltriethoxysilane (CAS No.: 919-30-2); ethylene-vinyl acetate elastomer UE 639-04 was purchased from Shanghai Yushi Plastics Co., Ltd. Example

[0030] Weigh out 60 parts of ethylene-octene copolymer, 15 parts of thermoplastic vulcanized rubber, 4 parts of nano-reinforcing filler, 5 parts of maleic anhydride-grafted ethylene-octene copolymer, 2 parts of composite foaming agent, 1 part of crosslinking agent, and 1 part of antioxidant. The ethylene-octene copolymer is of type ENGAGE™ 8180, the thermoplastic vulcanized rubber is of type Elastron V PV101.A40.N, the nano-reinforcing filler is composed of organic nano-montmorillonite and mica in a 1:1 mass ratio, the organic nano-montmorillonite is of type TY-710C, the maleic anhydride-grafted ethylene-octene copolymer is of type VA1202, the composite foaming agent is composed of azodicarbonamide and 4,4'-oxobisbenzenesulfonyl hydrazine in a 1:0.4 mass ratio, the crosslinking agent is composed of dicumyl peroxide and triallyl isocyanurate in a 1:1 mass ratio, and the antioxidant is composed of antioxidant 1076 and antioxidant 168 in a 1:1 mass ratio.

[0031] Ethylene-octene copolymer, thermoplastic vulcanized rubber, and maleic anhydride-grafted ethylene-octene copolymer were added to a mixer and melt-blended at 160°C and 50 rpm for 10 min. Nano-reinforcing filler was added, and the mixture was blended at 160°C and 50 rpm for 4 min. The mixture was then transferred to an open mill, cooled to 110°C, and then crosslinking agent, composite foaming agent, and antioxidant were added. The mixture was then blended at a speed ratio of 15 rpm for the front roller and 20 rpm for the rear roller for 3 min before sheeting. The sheet was then placed into the mold cavity of a compression molding foaming machine and crosslinked and foamed at 170°C and 12 MPa pressure. After holding the pressure for 12 min, the pressure was released, the material was cooled, and the mold was opened to obtain a high-damping, low-creep composite foam material for grip pads. Example

[0032] Weigh out 70 parts of ethylene-octene copolymer, 25 parts of thermoplastic vulcanized rubber, 8 parts of nano-reinforcing filler, 9 parts of maleic anhydride-grafted ethylene-octene copolymer, 4 parts of composite foaming agent, 2 parts of crosslinking agent, and 1.5 parts of antioxidant; the ethylene-octene copolymer is ENGAGE™ 8180, and the thermoplastic vulcanized rubber is Elastron V. PV101.A40.N, the nano-reinforcing filler is composed of organic nano-montmorillonite and mica in a mass ratio of 1:1.5, the organic nano-montmorillonite is model TY-710C, the maleic anhydride grafted ethylene-octene copolymer is model VA1202, the composite foaming agent is composed of azodicarbonamide and 4,4'-oxobisbenzenesulfonyl hydrazine in a mass ratio of 1:0.4, the crosslinking agent is composed of dicumyl peroxide and triallyl isocyanurate in a mass ratio of 1:1.4, and the antioxidant is composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1.

[0033] Ethylene-octene copolymer, thermoplastic vulcanized rubber, and maleic anhydride-grafted ethylene-octene copolymer were added to a mixer and melt-blended at 160°C and 50 rpm for 10 min. Nano-reinforcing filler was added, and the mixture was blended at 160°C and 50 rpm for 4 min. The mixture was then transferred to an open mill, cooled to 110°C, and then crosslinking agent, composite foaming agent, and antioxidant were added. The mixture was then blended at a speed ratio of 15 rpm for the front roller and 20 rpm for the rear roller for 3 min before sheeting. The sheet was then placed into the mold cavity of a compression molding foaming machine and crosslinked and foamed at 170°C and 12 MPa pressure. After holding the pressure for 12 min, the pressure was released, the material was cooled, and the mold was opened to obtain a high-damping, low-creep composite foam material for grip pads. Example

[0034] Weigh out 65 parts of ethylene-octene copolymer, 20 parts of thermoplastic vulcanized rubber, 6 parts of nano-reinforcing filler, 7 parts of maleic anhydride-grafted ethylene-octene copolymer, 3 parts of composite foaming agent, 1.5 parts of crosslinking agent, and 1.25 parts of antioxidant; the ethylene-octene copolymer is ENGAGE™ 8180, and the thermoplastic vulcanized rubber is Elastron V. PV101.A40.N, the nano-reinforcing filler is composed of organic nano-montmorillonite and mica in a mass ratio of 1:1.25, the organic nano-montmorillonite is model TY-710C, the maleic anhydride grafted ethylene-octene copolymer is model VA1202, the composite foaming agent is composed of azodicarbonamide and 4,4'-oxobisbenzenesulfonyl hydrazine in a mass ratio of 1:0.4, the crosslinking agent is composed of dicumyl peroxide and triallyl isocyanurate in a mass ratio of 1:1.2, and the antioxidant is composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1.

[0035] Ethylene-octene copolymer, thermoplastic vulcanized rubber, and maleic anhydride-grafted ethylene-octene copolymer were added to a mixer and melt-blended at 160°C and 50 rpm for 10 min. Nano-reinforcing filler was added, and the mixture was blended at 160°C and 50 rpm for 4 min. The mixture was then transferred to an open mill, cooled to 110°C, and then crosslinking agent, composite foaming agent, and antioxidant were added. The mixture was then blended at a speed ratio of 15 rpm for the front roller and 20 rpm for the rear roller for 3 min before sheeting. The sheet was then placed into the mold cavity of a compression molding foaming machine and crosslinked and foamed at 170°C and 12 MPa pressure. After holding the pressure for 12 min, the pressure was released, the material was cooled, and the mold was opened to obtain a high-damping, low-creep composite foam material for grip pads. Example

[0036] Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that the mass ratio of organic nano-montmorillonite and mica in the nano-reinforcing filler in Example 4 is 1:0.5. Example

[0037] Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that the mass ratio of organic nano-montmorillonite and mica in the nano-reinforcing filler in Example 5 is 1:2. Example

[0038] Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that the nano-reinforcing filler in Example 6 has undergone modification treatment and is prepared using the following steps: The mass ratio of nano-reinforcing filler to γ-aminopropyltriethoxysilane is 1:0.015.

[0039] The nano-reinforcing filler was added to an ethanol-water solution (ethanol to water volume ratio 9:1) and ultrasonically dispersed at 500W for 30 min to obtain a dispersion (solid content 5%). γ-aminopropyltriethoxysilane was added to the dispersion, and the pH of the solution was adjusted to 5.0 using glacial acetic acid. The mixture was stirred and refluxed at 200 rpm at 70℃ for 4 h. After the reaction was completed, the mixture was filtered, washed with anhydrous ethanol, vacuum dried at 80℃, ground, and passed through a 200-mesh sieve to obtain the modified nano-reinforcing filler. Example

[0040] Example 7 is based on Example 6. The only difference between Example 7 and Example 6 is that the mass ratio of nano-reinforcing filler and γ-aminopropyltriethoxysilane in Example 7 is 1:0.025. Example

[0041] Example 8 is based on Example 6. The only difference between Example 8 and Example 6 is that the mass ratio of nano-reinforcing filler and γ-aminopropyltriethoxysilane in Example 8 is 1:0.02. Example

[0042] Example 9 is based on Example 6. The only difference between Example 9 and Example 6 is that the mass ratio of nano-reinforcing filler and γ-aminopropyltriethoxysilane in Example 9 is 1:0.005. Example

[0043] Example 10 is based on Example 6. The only difference between Example 10 and Example 6 is that the mass ratio of nano-reinforcing filler and γ-aminopropyltriethoxysilane in Example 10 is 1:0.05. Example

[0044] Example 11 is based on Example 3. The only difference between Example 11 and Example 3 is that the raw materials used in Example 11 also include ethylene-vinyl acetate elastomer.

[0045] Weigh out 65 parts of ethylene-octene copolymer, 20 parts of thermoplastic vulcanized rubber, 10 parts of ethylene-vinyl acetate elastomer, 6 parts of nano-reinforcing filler, 7 parts of maleic anhydride-grafted ethylene-octene copolymer, 3 parts of composite foaming agent, 1.5 parts of crosslinking agent, and 1.25 parts of antioxidant; the ethylene-octene copolymer is ENGAGE™ 8180, and the thermoplastic vulcanized rubber is Elastron V. PV101.A40.N, the nano-reinforcing filler is composed of organic nano-montmorillonite and mica in a mass ratio of 1:1.25, the organic nano-montmorillonite is model TY-710C, the maleic anhydride grafted ethylene-octene copolymer is model VA1202, the composite foaming agent is composed of azodicarbonamide and 4,4'-oxobisbenzenesulfonyl hydrazine in a mass ratio of 1:0.4, the crosslinking agent is composed of dicumyl peroxide and triallyl isocyanurate in a mass ratio of 1:1.2, and the antioxidant is composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1.

[0046] Ethylene-octene copolymer, thermoplastic vulcanized rubber, ethylene-vinyl acetate elastomer, and maleic anhydride-grafted ethylene-octene copolymer were added to a mixer and melt-blended at 160°C and 50 rpm for 10 min. Nano-reinforcing fillers were added, and the mixture was blended at 160°C and 50 rpm for 4 min. The mixture was then transferred to an open mill, cooled to 110°C, and then crosslinking agent, composite foaming agent, and antioxidant were added. The mixture was then mixed at a speed ratio of 15 rpm for the front roller and 20 rpm for the rear roller for 3 min before sheeting. The sheet was then placed into the mold cavity of a compression molding foaming machine and crosslinked and foamed at 170°C and 12 MPa pressure. After holding the pressure for 12 min, the pressure was released, the material was cooled, and the mold was opened to obtain a high-damping, low-creep composite foam material for maneuvering pads. Example

[0047] Example 12 is based on Example 11. The only difference between Example 12 and Example 11 is that the amount of ethylene-vinyl acetate elastomer added in Example 12 is 15 parts. Example

[0048] Example 13 is based on Example 11. The only difference between Example 13 and Example 11 is that the amount of ethylene-vinyl acetate elastomer added in Example 13 is 12.5 parts. Example

[0049] Example 14 is based on Example 11. The only difference between Example 14 and Example 11 is that the amount of ethylene-vinyl acetate elastomer added in Example 14 is 5 parts. Example

[0050] Example 15 is based on Example 11. The only difference between Example 15 and Example 11 is that the amount of ethylene-vinyl acetate elastomer added in Example 15 is 20 parts. Example

[0051] Example 16 is based on Example 3. The only difference between Example 16 and Example 3 is that the mass ratio of dicumyl peroxide and triallyl isocyanurate in the crosslinking agent in Example 16 is 1:0.5. Example

[0052] Example 17 is based on Example 3. The only difference between Example 17 and Example 3 is that in Example 17, the mass ratio of dicumyl peroxide and triallyl isocyanurate in the crosslinking agent is 1:2.

[0053] Comparative Example 1 Comparative Example 1 did not contain maleic anhydride-grafted ethylene-octene copolymer.

[0054] Weigh out 65 parts of ethylene-octene copolymer, 20 parts of thermoplastic vulcanized rubber, 6 parts of nano-reinforcing filler, 3 parts of composite foaming agent, 1.5 parts of crosslinking agent, and 1.25 parts of antioxidant. The ethylene-octene copolymer is ENGAGE™ 8180, the thermoplastic vulcanized rubber is Elastron V PV101.A40.N, the nano-reinforcing filler is composed of organic nano-montmorillonite and mica in a mass ratio of 1:1.25, the organic nano-montmorillonite is TY-710C, the composite foaming agent is composed of azodicarbonamide and 4,4'-oxobisbenzenesulfonyl hydrazine in a mass ratio of 1:0.4, the crosslinking agent is composed of dicumyl peroxide and triallyl isocyanurate in a mass ratio of 1:1.2, and the antioxidant is composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1.

[0055] Ethylene-octene copolymer and thermoplastic vulcanized rubber were added to a mixing mill and melt-blended at 160°C and 50 rpm for 10 min. Nano-reinforcing filler was added and the mixture was blended at 160°C and 50 rpm for 4 min. The mixture was then transferred to an open mill, cooled to 110°C, and then crosslinking agent, composite foaming agent, and antioxidant were added. The mixture was then mixed at a speed ratio of 15 rpm for the front roller and 20 rpm for the rear roller for 3 min and then sheeted out to obtain a sheet material. The sheet material was placed into the mold cavity of a compression molding foaming machine and crosslinked and foamed at 170°C and 12 MPa pressure. After holding the pressure for 12 min, the pressure was released, the material was cooled, and the mold was opened to obtain a high-damping, low-creep composite foam material for grip pads.

[0056] (1) Select GB / T 7759-2015 Determination of compression set of vulcanized rubber or thermoplastic rubber - Part 1 under normal and high temperature conditions as the standard, prepare a sample with a diameter of 29.0±0.5mm and a thickness of 12.5±0.5mm, measure the initial thickness h0 of the sample, place the sample in the compression fixture, compress it to 25% of the original thickness at 70℃, keep it for 24h, take out the sample, let it recover at room temperature for 30min, measure the final thickness h1 of the sample, the compression set rate = (h0-h1) / h0×100%, and record the results in Table 1.

[0057] (2) Select GB / T 23124-2008 Gymnastics Apparatus Gymnastics Mat as the standard. Place the 2000mm×1200mm×200mm sample flat on the rigid base. Use a 20kg impact block to drop freely from 80mm to impact the pad surface. Record the displacement-time curve during the impact process through the sensor. Record the depth of penetration and the rebound height. Select three different positions for each sample. Test once at each position. Take the average value after measurement. Record the results in Table 1.

[0058] Table 1. Test results of slump resistance, cushioning, and comfort. Test results Compression set (%) Depth of ingress (mm) Springback height (mm) Example 1 12.3 97 81 Example 2 10.9 102 74 Example 3 11.1 100 70 Example 4 14.2 92 83 Example 5 14.8 88 87 Example 6 10.6 103 69 Example 7 10.5 105 67 Example 8 10.3 106 66 Example 9 10.8 102 72 Example 10 10.9 101 75 Example 11 10.2 108 65 Example 12 9.9 111 62 Example 13 9.8 113 61 Example 14 10.5 106 72 Example 15 12.8 115 68 Example 16 15.5 97 78 Example 17 13.2 101 75 Comparative Example 1 26.2 85 90 As shown in Table 1, the compression set of Examples 1-3 is less than 12.3%, the indentation depth is greater than 97m, and the rebound height is less than 81mm, which shows that the composite foam material prepared in this application has good anti-collapse, cushioning and comfort.

[0059] As shown in Table 1, the only difference between Examples 4 and 5 and Example 3 is that the limited ratio of nano-reinforcing filler was changed in Examples 4 and 5. Too much or too little mica will affect the balance between performance, thus reducing the performance.

[0060] As shown in Table 1, the only difference between Examples 6-10 and Example 3 is that in Examples 6-8, the nano-reinforcing filler was modified according to the specified ratio, which improved the dispersibility and compatibility, and the performance was improved; in Examples 9 and 10, the specified ratio was broken, and the performance improvement effect was reduced.

[0061] As shown in Table 1, the only difference between Examples 11-15 and Example 3 is that: in Examples 11-13, a limited amount of ethylene-vinyl acetate elastomer was added, which improved the material properties. In Examples 14 and 15, the amount was changed. Too much or too little ethylene-vinyl acetate elastomer affected the balance of properties, and the performance improvement effect was reduced.

[0062] As shown in Table 1, the only difference between Examples 16 and 17 and Example 3 is that the ratio of the crosslinking agent was changed in Examples 16 and 17, which affected the synergistic effect of the two and the performance decreased.

[0063] As shown in Table 1, the only difference between Comparative Example 1 and Example 3 is that maleic anhydride-grafted ethylene-octene copolymer was not added in Comparative Example 1, resulting in severe phase separation and significant performance degradation.

[0064] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.

Claims

1. A composite foam material for high-damping, low-creep maneuvering pads, characterized in that: The raw materials for preparation include the following components in parts by weight: 60-70 parts of ethylene-octene copolymer 15-25 parts of thermoplastic vulcanized rubber 4-8 parts of nano-reinforcing filler 5-9 parts of maleic anhydride-grafted ethylene-octene copolymer 2-4 parts of compound foaming agent 1-2 parts of crosslinking agent Antioxidant 1-1.5 parts.

2. The composite foam material for high-damping, low-creep maneuvering pads according to claim 1, characterized in that: The nano-reinforcing filler includes organic nano-montmorillonite and mica.

3. The composite foam material for high-damping, low-creep maneuvering pads according to claim 2, characterized in that: The mass ratio of the organic nano-montmorillonite to mica is 1:(1-1.5).

4. The composite foam material for high-damping, low-creep maneuvering pads according to claim 3, characterized in that: The nano-reinforcing filler was modified and prepared using the following steps: The nano-reinforcing filler was added to an ethanol aqueous solution and ultrasonically dispersed to obtain a dispersion. γ-aminopropyltriethoxysilane was added to the dispersion to adjust the pH of the solution to acidic. The solution was heated and stirred under reflux. After the reaction was completed, the mixture was filtered, washed, dried, ground, and sieved to obtain the modified nano-reinforcing filler.

5. The composite foam material for high-damping, low-creep maneuvering pads according to claim 4, characterized in that: The mass ratio of the nano-reinforcing filler to γ-aminopropyltriethoxysilane is 1:(0.015-0.025).

6. The composite foam material for high-damping, low-creep maneuvering pads according to claim 1, characterized in that: The raw materials for preparation also include ethylene-vinyl acetate elastomer.

7. The composite foam material for high-damping, low-creep maneuvering pads according to claim 6, characterized in that: The amount of the ethylene-vinyl acetate elastomer added is 10-15 parts.

8. The composite foam material for high-damping, low-creep maneuvering pads according to claim 1, characterized in that: The crosslinking agent includes dicumyl peroxide and triallyl isocyanurate.

9. The composite foam material for high-damping, low-creep maneuvering pads according to claim 8, characterized in that: The mass ratio of dicumyl peroxide to triallyl isocyanurate is 1:(1-1.4).

10. A preparation process for a high-damping, low-creep composite foam material for a maneuvering pad as described in any one of claims 1-9, characterized in that: Includes the following steps: Ethylene-octene copolymer, thermoplastic vulcanized rubber, and maleic anhydride-grafted ethylene-octene copolymer are melt-blended, and nano-reinforcing fillers are added. After mixing, crosslinking agent, composite foaming agent, and antioxidant are added, and the mixture is mixed and sheeted to obtain a sheet material. The sheet material is then crosslinked and foamed, and after pressure holding, it is depressurized, cooled, and molded to obtain a composite foam material for high-damping, low-creep maneuvering pads.