High-wear-resistant tpu composite material for cleaning brush of floor-sweeping robot and preparation method thereof

Abstract

The application relates to the technical field of high-wear-resistance TPU composite materials, in particular to a high-wear-resistance TPU composite material for a cleaning brush of a sweeping robot and a preparation method thereof, which is prepared from the following raw materials in parts by weight: TPU 40-50 parts, modified rubber 30-40 parts, composite wear-resistant filler 5-10 parts, carbon fiber 10-15 parts, modifier 5-10 parts, silane coupling agent 2-3 parts, antioxidant 1-2 parts and compatilizer 2-3 parts; the modifier is obtained by mixing and extruding glycidyl methacrylate grafted ethylene-octene copolymer, hyperbranched polyether ether ketone and polyamide according to a weight ratio of (3-5):(5-9):3; through the synergistic effect of the multiple components, the bristles can effectively meet the wear resistance requirement in a high-strength sweeping scene, such as sweeping a large rough ground or a ground frequently contacted with sharp objects, the bristles are prevented from being abraded and deformed too early due to insufficient wear resistance, and therefore the service life of the cleaning brush of the sweeping robot is prolonged.

Description

Technical Field

[0001] This application relates to the field of high abrasion-resistant TPU composite material technology, and more specifically, to a high abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners and its preparation method. Background Technology

[0002] Robotic vacuum cleaners' cleaning brushes can reach deep into floor crevices and corners, areas that suction power cannot directly reach. For example, for small debris such as dust, breadcrumbs, and pet hair, the high-speed rotation of the brush bristles creates friction and a sweeping motion as they contact the floor, dislodging the dust and debris from crevices and corners. Therefore, the bristles need to be made of durable, wear-resistant materials to withstand the long-term friction and cleaning required by robotic vacuum cleaners on various floor types.

[0003] To meet the long-term friction cleaning needs of robotic vacuum cleaners on various types of floor surfaces, the brush bristles must possess excellent abrasion resistance. Thermoplastic polyurethane elastomer (TPU) is widely used in bristle manufacturing due to its superior abrasion resistance. TPU bristles can withstand prolonged friction and use, and are less prone to wear and breakage, thus extending the lifespan of the cleaning brush and reducing replacement frequency. Furthermore, TPU bristles have good elasticity, allowing them to closely conform to the floor and various complex terrains, including floor crevices and corners where suction is difficult to reach directly, further enhancing cleaning effectiveness.

[0004] In the process of preparing TPU bristles, appropriate amounts of inorganic fillers, such as nano-silica, carbon nanotubes, graphene, or nanoclay, are typically added to the TPU. These inorganic fillers form a stable composite network structure with the TPU matrix, thereby significantly improving the abrasion resistance and tear resistance of the bristles. For example, when the amount of graphene nanosheets added to TPU is 1%-20%, the abrasion resistance of TPU can be increased by 60%-80%; inorganic fillers such as nano-silica and carbon nanotubes, when added at an amount of 5%-30%, can also effectively improve the abrasion resistance of TPU bristles.

[0005] However, in practical use, there are limitations to improving the abrasion resistance of TPU bristles simply by adding inorganic fillers. Firstly, the improvement is limited and only suitable for general cleaning scenarios. In scenarios requiring high-intensity cleaning, such as cleaning large areas of rough surfaces or surfaces frequently in contact with sharp objects, the abrasion resistance of the TPU bristles still falls short. Secondly, the amount of inorganic filler added cannot exceed 30%, otherwise it will lead to a decrease in the flexibility and elasticity of the TPU bristles, while significantly increasing their brittleness, making the bristles prone to breakage during use. Therefore, simply increasing the amount of inorganic filler cannot effectively solve the problem of insufficient abrasion resistance of TPU bristles in high-intensity cleaning scenarios. Summary of the Invention

[0006] To further improve the abrasion resistance of TPU bristles, this application provides a high abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners and its preparation method.

[0007] In a first aspect, this application provides a high-wear-resistant TPU composite material for the cleaning brush of a robotic vacuum cleaner, employing the following technical solution:

[0008] A highly abrasion-resistant TPU composite material for cleaning brushes in robotic vacuum cleaners is prepared from the following raw materials in parts by weight:

[0009] 40-50 parts TPU

[0010] 30-40 parts of modified rubber

[0011] 5-10 parts of composite wear-resistant filler

[0012] 10-15 parts carbon fiber

[0013] 5-10 parts of modifier

[0014] 2-3 parts of silane coupling agent

[0015] 1-2 parts antioxidant

[0016] 2-3 parts compatibilizer

[0017] The modifier is obtained by mixing and extruding glycidyl methacrylate-grafted ethylene-octene copolymer, hyperbranched polyether ether ketone and polyamide in a weight ratio of (3-5):(5-9):3.

[0018] By adopting the above technical solution and through the synergistic effect of multiple components, the high abrasion resistance requirement of the bristles can be effectively met in high-intensity cleaning scenarios, such as cleaning large areas of rough ground or ground that frequently comes into contact with sharp objects. This avoids problems such as premature wear and deformation of the bristles due to insufficient abrasion resistance, thereby extending the service life of the cleaning brush of the robot vacuum cleaner.

[0019] While improving wear resistance, this composite material rationally controls the addition of each component, avoiding problems such as decreased flexibility and elasticity of TPU bristles, significantly increased hardness, and easy breakage caused by excessive addition of inorganic fillers. This allows the cleaning brush to maintain good flexibility and elasticity during use, better conforming to the ground for cleaning and adapting to different cleaning scenarios, while also preventing it from breaking easily due to excessive hardness, ensuring the normal use and durability of the cleaning brush.

[0020] The addition of modified rubber further enhances the flexibility and elasticity of TPU. When subjected to external forces, the modified rubber can deform in tandem with TPU, disperse stress, reduce the risk of bristle breakage during cleaning, and improve the resilience of the material, allowing the bristles to quickly return to their original shape.

[0021] Silane coupling agents are primarily used to improve the interfacial bonding between the composite wear-resistant filler and carbon fiber and the TPU matrix. The composite wear-resistant filler and carbon fiber work together to construct a more stable composite network structure. Distributed within the TPU matrix, the composite wear-resistant filler effectively disperses and bears the frictional forces generated during cleaning, preventing the cutting and ploughing action of abrasive particles, thereby improving the material's wear resistance. Carbon fiber, with its high strength and high modulus, acts as a skeletal support within the composite material, further enhancing its tensile and shear resistance, making the bristles less prone to deformation and damage under significant external forces. Together with the composite wear-resistant filler, they enhance the overall wear resistance of the TPU bristles, enabling them to meet the demands of high-intensity cleaning scenarios.

[0022] The modifier is obtained by extrusion of glycidyl methacrylate-grafted ethylene-octene copolymer, hyperbranched polyetheretherketone (PEEK), and polyamide. The glycidyl methacrylate-grafted ethylene-octene copolymer reacts or interacts with the molecular chains of TPU and modified rubber, improving their compatibility and allowing for more uniform dispersion of the components in the composite material, forming a good interfacial bond and thus enhancing the overall performance of the material. The hyperbranched PEEK, with its abundant branched structure and active functional groups, interacts with the functional groups on the surface of the composite wear-resistant filler and carbon fiber, improving the compatibility and interfacial bonding strength between the filler and the matrix, further optimizing the mechanical and wear-resistant properties of the composite material. The polyamide imparts a certain degree of lubricity and flexibility to the composite material, reducing the coefficient of friction on the material surface and, to some extent, reducing frictional wear of the brush bristles during cleaning.

[0023] Preferably, the modified rubber is prepared by the following method:

[0024] 1) Mix the monomer containing the epoxy group with an organic solvent to obtain a mixed solution;

[0025] 2) Add EPDM rubber and initiator to the mixed solution and react at 65-80℃ with continuous stirring. After reacting for 2-3 hours, remove the solvent from the reaction system by distillation and dry it in a hot air oven to obtain modified EPDM rubber.

[0026] Preferably, the weight ratio of the monomer containing epoxy groups, the EPDM rubber, and the initiator is (10-30):100:(0.5-2).

[0027] By employing the above technical solution, epoxy groups are introduced into the EPDM rubber molecular chain through a reaction between monomers containing epoxy groups and EPDM rubber under the action of an initiator. When this modified EPDM rubber is blended with TPU, a network structure with a synergistic effect is formed. Under external force, this network structure can effectively disperse stress, allowing the bristles to maintain good flexibility during cleaning, better conforming to various complex surfaces, while also possessing sufficient elasticity to quickly return to their original shape, reducing the risk of breakage due to repeated bending and thus extending the lifespan of the bristles.

[0028] Furthermore, the modified EPDM rubber exhibits better compatibility with TPU. In composite materials, good compatibility allows for more uniform dispersion and bonding of components, reducing interfacial defects and separation. This helps to fully leverage the advantages of each component, allowing the elasticity and toughness of TPU to better integrate with the flexibility and impact resistance of the modified rubber, thus improving the overall performance of the composite material, including abrasion resistance and tear resistance. This further enhances the applicability and durability of TPU bristles in high-intensity cleaning scenarios.

[0029] Preferably, the monomer containing an epoxy group includes at least one of glycidyl methacrylate, epichlorohydrin, epichlorohydrin, and epichlorohydrin.

[0030] By adopting the above technical solutions and optimizing the types of monomers containing epoxy groups, the flexibility and elasticity of the rubber are significantly enhanced, making it adaptable to repeated bending during cleaning. Simultaneously, the modified rubber exhibits better compatibility with TPU, and the components are more evenly dispersed, improving the abrasion resistance and tear resistance of the bristles.

[0031] Preferably, the composite wear-resistant filler is composed of inorganic fillers with an average particle size of 20-100nm, inorganic fillers with an average particle size of 150-300nm, and inorganic fillers with an average particle size of 400-500nm in a weight ratio of (5-8):(3-5):1.

[0032] By adopting the above technical solution, inorganic fillers of different particle sizes are used to form a composite wear-resistant filler. These three components work together within the TPU matrix to form a denser composite network structure. Smaller particle sizes fill the gaps between larger particle sizes, making the entire filler system more compact. In high-intensity cleaning scenarios, such as cleaning rough surfaces or surfaces frequently in contact with sharp objects, this effectively prevents the intrusion and scratching of external abrasive particles, enhancing the wear resistance of the TPU bristles. Simultaneously, the cooperation of inorganic fillers of different particle sizes disperses and absorbs the tearing forces generated during cleaning. When subjected to external impacts or scratches from sharp objects, this enhances the tear resistance of the TPU bristles, reduces the risk of bristle tearing, and improves the durability of the bristles in complex cleaning environments.

[0033] Preferably, the carbon fiber has a diameter of 5-10 μm and a length of 0.01-0.1 mm.

[0034] By adopting the above technical solutions and optimizing the length and diameter of carbon fibers, the carbon fibers have a larger specific surface area and a wider contact area with the TPU matrix, resulting in stronger interfacial bonding. This facilitates the effective transfer of stress between the carbon fibers and the matrix, thereby improving the overall strength of the composite material. Simultaneously, the shorter carbon fibers can be more uniformly dispersed in the matrix, avoiding agglomeration and forming a denser network structure within the material. This structural optimization not only enhances the wear resistance of the composite material, enabling it to better withstand the friction generated during cleaning, but also improves its tear resistance, making the bristles less prone to tearing when encountering sharp objects.

[0035] Preferably, the compatibilizer is composed of TPU-g-MAH and EPDM-g-MAH in a weight ratio of 1:(2-4).

[0036] By adopting the above technical solution and optimizing the type and dosage ratio of compatibilizer, the interfacial tension between different raw materials can be significantly reduced, promoting the uniform dispersion of each component in the composite material, thereby improving the overall mechanical properties and wear resistance of the material. Simultaneously, it can also enhance the flexibility and elasticity of the composite material, ensuring that the bristles are not easily broken under high-intensity cleaning scenarios and extending its service life.

[0037] Preferably, the silane coupling agent comprises one of γ-aminopropyltriethoxysilane, 3-glycidyl etheroxypropyltriethoxysilane, γ-glycidyl etheroxypropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidyl etheroxypropyltriethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane.

[0038] By adopting the above technical solutions and optimizing the types of silane coupling agents, the bonding force between inorganic fillers, carbon fibers, and the TPU matrix is ​​further enhanced. Simultaneously, the fillers and fibers are uniformly dispersed, preventing agglomeration, thereby improving the material's mechanical properties and wear resistance.

[0039] Preferably, the antioxidant includes one or more of 1010, 168, 1035, 1098, 1076, 1135 or 1024.

[0040] By adopting the above technical solutions, optimizing the types of antioxidants can stabilize the molecular structure of TPU composite materials, prevent molecular chain breakage or cross-linking caused by oxidation, thereby maintaining the stability of the material's mechanical and physical properties, and ensuring that the bristles can still maintain good wear resistance and flexibility after long-term use.

[0041] Secondly, this application provides a method for preparing a high-wear-resistant TPU composite material for a cleaning brush of a robotic vacuum cleaner, using the following technical solution:

[0042] A method for preparing a high-abrasion-resistant TPU composite material for a cleaning brush of a robotic vacuum cleaner includes the following steps:

[0043] S1. Mix TPU, modified rubber, composite wear-resistant filler, carbon fiber, modifier, silane coupling agent, antioxidant and compatibilizer to obtain a mixture;

[0044] S2. The mixture is then extruded in a screw press and granulated to obtain a high wear-resistant TPU composite material for the cleaning brush of a sweeping robot.

[0045] By adopting the above technical solution, the components can be fully and uniformly dispersed. Through screw extrusion and granulation, the components are fully integrated under high temperature and shear force to form a stable composite network structure. This process is not only simple to operate and easy to industrialize, but also effectively improves the wear resistance, flexibility and elasticity of the material, enabling the cleaning brush to perform excellently in high-intensity cleaning scenarios, extending its service life, while ensuring that the bristles are not easily broken or deformed, adapting to various cleaning needs.

[0046] In summary, this application has the following beneficial effects:

[0047] 1. The high-abrasion-resistant TPU composite material significantly improves the performance of the cleaning brush in robotic vacuum cleaners through the synergistic effect of multiple components. Its high abrasion resistance stems from the combination of composite abrasion-resistant filler and carbon fiber. The filler disperses friction and prevents abrasive cutting, while the carbon fiber provides skeletal support, enhancing tensile and shear strength. Modified rubber enhances flexibility and elasticity, allowing the bristles to better conform to the ground and resist breakage. Glycidyl methacrylate-grafted ethylene-octene copolymer in the modifier improves compatibility, hyperbranched polyetheretherketone enhances interfacial bonding strength, and polyamide imparts lubrication and flexibility, reducing the coefficient of friction. Silane coupling agents further enhance interfacial bonding. This composite material effectively prevents premature bristle wear and deformation under high-intensity cleaning scenarios, extending its service life while maintaining good flexibility and elasticity, adapting to various cleaning conditions. Detailed Implementation

[0048] Example

[0049] The TPU is from Lubrizol, model number 2363-90AE.

[0050] The modified rubber is from Dow Chemical and is designated EPDM 4725P.

[0051] The glycidyl methacrylate-grafted ethylene-octene copolymer was purchased from Dongguan Shenghao Plastic Raw Materials Co., Ltd., model number SH035.

[0052] The styrene-butadiene-styrene block copolymer was purchased from Suzhou Ranpu Import & Export Co., Ltd., and its grade is 3542.

[0053] The polyamide was purchased from Suzhou Ranpu Import & Export Co., Ltd., and its brand name is DuPont CELANESE.

[0054] The EPDM rubber was purchased from Shanghai Jinju International Trade Co., Ltd., model number 2650C.

[0055] The TPU-g-MAH was purchased from Dongguan Shenghao Plastic Raw Materials Co., Ltd., and its model number is TPU-G-MAH.

[0056] EPDM-g-MAH was purchased from Shenzhen Huixin Plastics & Chemical Co., Ltd., product number Royaltuf.

[0057] Example 1

[0058] A highly abrasion-resistant TPU composite material for cleaning brushes in robotic vacuum cleaners is prepared by the following method:

[0059] S1. Mix 400g of TPU, 300g of modified rubber, 50g of composite wear-resistant filler, 100g of carbon fiber, 50g of modifier, 20g of silane coupling agent (γ-aminopropyltriethoxysilane), 10g of antioxidant (antioxidant 1010) and 20g of compatibilizer to obtain a mixture.

[0060] S2. The mixture is then extruded in a screw press and granulated to obtain a high wear-resistant TPU composite material for the cleaning brush of a sweeping robot.

[0061] The modifier is obtained by extrusion of glycidyl methacrylate-grafted ethylene-octene copolymer, hyperbranched polyether ether ketone and polyamide in a weight ratio of 3:5:3.

[0062] The composite wear-resistant filler is composed of silica with an average particle size of 20nm, 150nm and 400nm in a weight ratio of 5:3:1.

[0063] The carbon fiber has a diameter of 5μm and a length of 0.01mm.

[0064] The compatibilizer is composed of TPU-g-MAH and EPDM-g-MAH in a weight ratio of 1:2.

[0065] The difference between Examples 2-3 and Example 1 lies in the type, amount, and parameters of the raw materials used to prepare the high-abrasion-resistant TPU composite material for the cleaning brush of the robotic vacuum cleaner. The specific differences are shown in Table 1.

[0066] Table 1. Types, dosages, and parameters of raw materials for preparing high-abrasion-resistant TPU composite materials for robot vacuum cleaner brushes.

[0067]

[0068]

[0069] In Example 1, the composite wear-resistant filler is composed of silica with an average particle size of 20 nm, 150 nm and 400 nm in a weight ratio of 5:3:1.

[0070] In Example 2, the composite wear-resistant filler is composed of silica with an average particle size of 60 nm, silica with an average particle size of 220 nm, and silica with an average particle size of 450 nm in a weight ratio of 6:4:1.

[0071] In Example 3, the composite wear-resistant filler is composed of silica with an average particle size of 100 nm, 300 nm and 500 nm in a weight ratio of 8:5:1.

[0072] Example 4

[0073] A high-abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. This embodiment differs from Embodiment 1 in that the modified rubber is prepared by the following method:

[0074] 1) Mix 10g of monomer containing epoxy groups (glycidyl methacrylate) with 300g of organic solvent (toluene) to obtain a mixed solution;

[0075] 2) Add 100g of EPDM rubber and 0.5g of initiator (benzoyl peroxide) to the mixed solution, and react at 75℃ with continuous stirring. After reacting for 2 hours, remove the solvent from the reaction system by distillation and dry it in a hot air oven to obtain modified EPDM rubber.

[0076] Example 5

[0077] A high-abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. This embodiment differs from Embodiment 1 in that the modified rubber is prepared by the following method:

[0078] 1) Mix 30g of monomers containing epoxy groups (glycidyl methacrylate and glycidyl methacrylate in a weight ratio of 1:1) with 400g of organic solvent (toluene) to obtain a mixed solution;

[0079] 2) Add 100g of EPDM rubber and 1g of initiator (azobisisobutyronitrile) to the mixed solution, react at 80℃, stir continuously, and after 3h of reaction, remove the solvent in the reaction system by distillation and dry in a hot air oven to obtain modified EPDM rubber.

[0080] Example 6

[0081] A high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. The difference between this embodiment and Embodiment 1 is that the composite wear-resistant filler is composed of silica with an average particle size of 100nm, 300nm and 500nm in a weight ratio of 1:1:1.

[0082] Example 6

[0083] A high abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. The difference between this embodiment and Embodiment 1 is that the compatibilizer is TPU-g-MAH.

[0084] Example 7

[0085] A high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. The difference between this embodiment and Embodiment 1 is that the carbon fiber has a diameter of 20 μm and a length of 0.01 mm.

[0086] Comparative Example

[0087] Comparative Example 1

[0088] A high abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. The difference between this comparative example and Example 1 is that the modifier is glycidyl methacrylate grafted ethylene-octene copolymer.

[0089] Comparative Example 2

[0090] A high abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. The difference between this comparative example and Example 1 is that the modifier is obtained by extrusion of glycidyl methacrylate-grafted ethylene-octene copolymer and polyamide in a weight ratio of 3:3.

[0091] Comparative Example 3

[0092] A high abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. The difference between this comparative example and Example 1 is that no substitute modifier is added.

[0093] Comparative Example 4

[0094] A high abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. The difference between this comparative example and Example 1 is that no carbon fiber is added.

[0095] Comparative Example 5

[0096] A high abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. The difference between this comparative example and Example 1 is that polyethylene is used instead of modified rubber.

[0097] The molecular weight of polyethylene is 5000 when heated.

[0098] Comparative Example 6

[0099] A high abrasion-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners. The difference between this comparative example and Example 1 is that the amount of composite filler used is 200g.

[0100] Detection methods / test methods

[0101] Sample preparation:

[0102] Abrasion resistance: The high abrasion-resistant TPU composite materials for robot vacuum cleaners prepared in Examples 1-7 and Comparative Examples 1-6 were used to make brush bristle samples with a length of 50 mm and a diameter of 1 mm. The brush bristle samples were fixed on the fixture of the SRV reciprocating abrasion tester to ensure that the samples were in perpendicular contact with the abrasion surface (P120 grit sandpaper, simulating the surface of a rough ground or sharp object).

[0103] Parameter settings:

[0104] Reciprocating frequency: set to 10Hz to simulate the rapid reciprocating motion of the brush bristles during the cleaning process.

[0105] Reciprocating stroke: set to 10mm to simulate the contact distance between the brush bristles and the ground.

[0106] Load: Apply a vertical load of 10N to simulate the pressure of the brush bristles on the ground during the cleaning process.

[0107] Test time: Set to 30 minutes to ensure sufficient time for wear observation.

[0108] After the test, the depth and width of the scratches were measured.

[0109] Flexibility test: The high abrasion resistant TPU composite materials for cleaning brushes of sweeping robots prepared in Examples 1-7 and Comparative Examples 1-6 were made into cylindrical sample brushes with a length of 100 mm and a diameter of 1 mm, and a three-point bending tester was selected.

[0110] Bending parameter settings:

[0111] Bending angle: Set to 180° to simulate the maximum bending angle that the brush bristles may encounter during the cleaning process.

[0112] Bending speed: Select 10mm / min to simulate the bending rate in actual use.

[0113] Cycle count: set to 15,000 cycles to evaluate the fatigue resistance of the material.

[0114] During the experiment, the sample was observed to determine whether it fractured or deformed excessively after reaching the set number of cycles. If the sample remained intact and without significant damage after 15,000 bending cycles, it indicated good fatigue resistance and flexibility.

[0115] Elongation at break for fracture strength: Refer to GB / T 14344-2022. Experimental data are shown in Table 2:

[0116] Table 2. Experimental data of Examples 1-7 and Comparative Examples 1-6

[0117]

[0118]

[0119] The experimental data from Example 1 and Comparative Examples 1-3 show that the type and proportion of modifiers have a significant impact on the performance of the composite materials. In Example 1, the use of the composite modifier significantly improved the wear resistance and flexibility of the composite material, reduced the wear depth and width, while maintaining high fracture strength and elongation at break. In contrast, the use of a single modifier or the absence of a modifier in Comparative Examples 1-3 resulted in a significant decrease in wear resistance and flexibility, as well as a marked reduction in fracture strength and elongation at break.

[0120] The experimental data from Example 1 and Comparative Examples 4-6 show that the addition of carbon fiber has a positive effect on the wear resistance and flexibility of the composite material. In Example 1, the addition of carbon fiber significantly reduced the wear depth and width, while maintaining good flexibility and high fracture strength and elongation at break.

[0121] In Comparative Example 6, the excessive amount of composite filler improved the wear resistance but reduced the flexibility.

[0122] The experimental data from Examples 1 and 4-5 show that the modified rubber prepared by the specific method further improves the wear resistance and flexibility of the composite material, reduces the wear depth and width, and improves the fracture strength and elongation at break.

[0123] The experimental data from Examples 1 and 6-7 show that the particle size and ratio of the composite wear-resistant filler, as well as the diameter of the carbon fiber, have an improving effect on the overall performance of the composite material. In Example 1, the optimized particle size distribution and ratio of the composite wear-resistant filler exhibited good wear resistance and flexibility. In Example 6, the larger particle size and different ratio of the composite wear-resistant filler resulted in slightly poorer wear resistance, but good flexibility. In Example 7, the increased carbon fiber diameter led to a slight decrease in wear resistance, but good flexibility was maintained. This indicates that using specific particle size distributions of the composite wear-resistant filler and the size of the carbon fiber can balance wear resistance and flexibility.

[0124] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-abrasion-resistant TPU composite material for cleaning brushes in robotic vacuum cleaners, characterized in that, It is prepared from the following raw materials in parts by weight: 40-50 parts TPU 30-40 parts of modified rubber 5-10 parts of composite wear-resistant filler 10-15 parts carbon fiber 5-10 parts of modifier 2-3 parts of silane coupling agent 1-2 parts antioxidant 2-3 parts compatibilizer The modifier is obtained by extrusion of glycidyl methacrylate-grafted ethylene-octene copolymer, hyperbranched polyether ether ketone and polyamide in a weight ratio of (3-5):(5-9):3; The modified rubber is prepared by the following method: 1) Mix the monomer containing the epoxy group with an organic solvent to obtain a mixed solution; 2) Add EPDM rubber and initiator to the mixed solution, react at 65-80℃ with continuous stirring, and after 2-3 hours of reaction, remove the solvent from the reaction system by distillation and dry it in a hot air oven to obtain modified EPDM rubber. The monomer containing epoxy groups includes at least one of glycidyl methacrylate, glycidyl methacrylate, epichlorohydrin, and glycidyl methacrylate. The weight ratio of the monomer containing epoxy groups, the EPDM rubber, and the initiator is (10-30):100:(0.5-2).

2. The high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners according to claim 1, characterized in that: The composite wear-resistant filler is composed of inorganic fillers with an average particle size of 20-100nm, inorganic fillers with an average particle size of 150-300nm, and inorganic fillers with an average particle size of 400-500nm in a weight ratio of (5-8):(3-5):

1.

3. The high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners according to claim 1, characterized in that: The carbon fiber has a diameter of 5-10 μm and a length of 0.01-0.1 mm.

4. The high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners according to claim 1, characterized in that: The compatibilizer is composed of TPU-g-MAH and EPDM-g-MAH in a weight ratio of 1:(2-4).

5. The high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners according to claim 1, characterized in that: The silane coupling agent includes one of γ-aminopropyltriethoxysilane, 3-glycidyl etheroxypropyltriethoxysilane, γ-glycidyl etheroxypropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidyl etheroxypropyltriethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane.

6. The high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners according to claim 1, characterized in that: The antioxidant includes one or more of 1010, 168, 1035, 1098, 1076, 1135 or 1024.

7. A method for preparing a high-abrasion-resistant TPU composite material for a cleaning brush of a robotic vacuum cleaner as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Mix TPU, modified rubber, composite wear-resistant filler, carbon fiber, modifier, silane coupling agent, antioxidant and compatibilizer to obtain a mixture; S2. The mixture is then extruded in a screw press and granulated to obtain a high wear-resistant TPU composite material for the cleaning brush of a sweeping robot.

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