High-wear-resistance TPU composite material for cleaning brush of sweeping robot and preparation method of high-wear-resistance TPU composite material

Abstract

The invention 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 of the high-wear-resistance TPU composite material. The TPU composite material is prepared from the following raw materials in parts by weight: 40-50 parts of TPU, 30-40 parts of modified rubber, 5-10 parts of a composite wear-resistant filler, 10-15 parts of carbon fibers, 5-10 parts of a modifier, 2-3 parts of a silane coupling agent, 1-2 parts of an antioxidant and 2-3 parts of a compatilizer. The modifier is obtained by mixing and extruding glycidyl methacrylate grafted ethylene-octylene copolymer, hyperbranched polyether-ether-ketone and polyamide according to the weight part ratio of (3-5): (5-9): 3, and through the synergistic effect of the various components, the modifier can be used for cleaning a large-area rough ground or a ground in frequent contact with a sharp object in a high-strength cleaning scene, such as cleaning the large-area rough ground or the ground in frequent contact with the sharp object. The brush hair can effectively meet the wear resistance requirement, the problems that due to insufficient wear resistance, the brush hair is abraded and deformed too early are solved, and therefore the service life of the cleaning brush of the sweeping robot is prolonged.

Description

TECHNICAL FIELD

[0001] 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. BACKGROUND

[0002] The cleaning brush of the sweeping robot can reach places where suction force cannot directly act, such as floor gaps and corners. For example, for some small garbage particles, such as dust, bread crumbs and pet hair, the cleaning brush rotates at high speed, and the bristles contact the ground during rotation to generate friction and sweeping effect, so as to sweep the dust and debris out of the gaps and corners. Therefore, the bristles need to be made of a material with good wear resistance to meet the needs of the sweeping robot for long-term friction and cleaning on different types of ground.

[0003] In order to meet the needs of the sweeping robot for long-term friction and cleaning on different types of ground, the bristles must have good wear resistance. Thermoplastic polyurethane elastomer (TPU) is widely used in the preparation of bristles due to its excellent wear resistance. TPU bristles can withstand long-term friction and use without easily wearing out or breaking, thereby prolonging the service life of the cleaning brush and reducing the replacement frequency. In addition, TPU bristles also have good elasticity, which can closely fit the ground and various complex terrains, including places where suction force cannot directly act, such as floor gaps and corners, further improving the cleaning effect.

[0004] During the preparation of TPU bristles, a proper amount of inorganic fillers, such as nano-silicon dioxide, carbon nanotubes, graphene or nano-clay, etc., are usually added to TPU. These inorganic fillers form a stable composite network structure with the TPU matrix, thereby significantly improving the wear resistance and tear resistance of the bristles. For example, when the addition amount of graphene nanoplate material in TPU is 1%-20%, the wear resistance of TPU can be improved by 60%-80%; when the addition amount of inorganic fillers such as nano-silicon dioxide and carbon nanotubes is 5%-30%, the wear resistance of TPU bristles can also be effectively improved.

[0005] However, there are certain limitations in improving the wear resistance of TPU bristles by adding inorganic fillers during actual use. On the one hand, the improvement is limited and can only be applied to general cleaning scenarios. Once it encounters high-strength cleaning scenarios, such as cleaning large areas of rough ground or ground frequently contacting sharp objects, the wear resistance of TPU bristles still cannot meet the needs. On the other hand, the addition amount of inorganic fillers cannot exceed 30%, otherwise the flexibility and elasticity of TPU bristles will decrease, and the brittleness will greatly increase, causing the bristles to easily break during use. Therefore, simply increasing the addition amount of inorganic fillers cannot effectively solve the problem of insufficient wear resistance of TPU bristles in high-strength cleaning scenarios. SUMMARY

[0006] In order to further improve the wear resistance of TPU bristles, the application provides a high-wear-resistant TPU composite material for a cleaning brush of a sweeping robot and a preparation method thereof.

[0007] In a first aspect, the application provides a high-wear-resistant TPU composite material for a cleaning brush of a sweeping robot, which adopts the following technical solution: A high-wear-resistant TPU composite material for a cleaning brush of a sweeping robot is prepared from the following raw materials 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 Compatibilizer 2-3 parts The modifier is obtained by mixing and extruding glycidyl methacrylate grafted ethylene-octene copolymer, hyperbranched polyether ether ketone, and polyamide at a weight ratio of (3-5):(5-9):3.

[0008] By adopting the above technical solution, through the synergistic effect of multiple components, the high-wear-resistant requirement of the bristles can be effectively met in high-strength cleaning scenarios, such as cleaning large-area rough ground or ground frequently contacted with sharp objects, avoiding the problems of premature wear and deformation of the bristles due to insufficient wear resistance, thereby prolonging the service life of the cleaning brush of the sweeping robot.

[0009] While improving wear resistance, the composite material reasonably controls the addition amount of each component, avoiding the problems of decreased flexibility and elasticity of TPU bristles, significantly increased hardness, and easy breaking of bristles due to excessive addition of inorganic fillers. The cleaning brush can maintain good flexibility and elasticity during use, better adhere to the ground for cleaning, adapt to different cleaning scenarios, and not easily break due to excessive hardness, ensuring normal use and durability of the cleaning brush.

[0010] The addition of modified rubber further enhances the flexibility and elasticity of TPU. When subjected to external force, the modified rubber can deform cooperatively with TPU, disperse stress, reduce the risk of breaking of the bristles during cleaning, and improve the resilience of the material, allowing the bristles to quickly recover to their original state.

[0011] The silane coupling agent is mainly used to improve the interfacial bonding force between the composite wear-resistant filler and the carbon fiber and the TPU matrix. The composite wear-resistant filler and the carbon fiber jointly build a more stable composite network structure. The composite wear-resistant filler is distributed in the TPU matrix, which can effectively disperse and bear the friction force generated in the cleaning process, prevent the cutting and plowing action of abrasive particles, and thus improve the wear resistance of the material; the carbon fiber has the characteristics of high strength and high modulus, and can play a role in supporting the framework in the composite material, further enhancing the tensile and shear resistance of the material, so that the brush does not easily deform and damage when bearing a larger external force, and cooperates with the composite wear-resistant filler to improve the overall wear resistance of the TPU brush, so that it can meet the needs of high-strength cleaning scenes.

[0012] The modifier is obtained by mixing extrusion of glycidyl methacrylate grafted ethylene-octene copolymer, hyperbranched polyether ether ketone and polyamide. Among them, the glycidyl methacrylate grafted ethylene-octene copolymer can react or interact with the molecular chains of TPU and modified rubber, improve the compatibility between them, so that each component can be more uniformly dispersed in the composite material, forming a good interfacial bond, thereby enhancing the overall performance of the material; the hyperbranched polyether ether ketone has a rich branched structure and active functional groups, which can interact with the functional groups on the surface of the composite wear-resistant filler and carbon fiber, improve the compatibility and interfacial adhesion strength of the filler and the matrix, and further optimize the mechanical properties and wear resistance of the composite material; the polyamide can impart certain lubricity and flexibility to the composite material, reduce the friction coefficient of the material surface, and to some extent reduce the friction and wear of the brush during cleaning.

[0013] Preferably, the modified rubber is prepared by the following method: 1) mixing a monomer containing an epoxy group with an organic solvent to obtain a mixed solution; 2) adding a terpolymer of ethylene-propylene rubber and an initiator into the mixed solution, and reacting at a temperature of 65-80°C, continuously stirring, removing the solvent in the reaction system by distillation after 2-3h of reaction, and drying in a hot air oven to obtain modified terpolymer of ethylene-propylene rubber.

[0014] Preferably, the weight ratio of the monomer containing an epoxy group, the terpolymer of ethylene-propylene rubber and the initiator is (10-30):100:(0.5-2).

[0015] By adopting the technical scheme, the monomer containing an epoxy group is reacted with the EPDM under the action of an initiator, so that the EPDM molecular chain is introduced with the epoxy group having special reactivity. When the modified EPDM is blended with the TPU, a network structure having a synergistic effect is formed. When subjected to an external force, the network structure can effectively disperse stress, so that the bristles can maintain good flexibility during cleaning, better adhere to various complex ground for cleaning, have sufficient elasticity, and quickly recover to the original state, thereby reducing the risk of breakage caused by repeated bending, and prolonging the service life of the bristles.

[0016] In addition, the modified EPDM has better compatibility with the TPU. In the composite material, good compatibility can make the components more uniformly dispersed and combined, reduce defects and separation phenomena at the interface. This helps to fully exert the advantages of each component, better integrates the elasticity and toughness of the TPU with the flexibility and impact resistance of the modified rubber, improves the comprehensive performance of the entire composite material, including wear resistance, tear resistance, and further improves the applicability and durability of the TPU bristles in high-strength cleaning scenarios.

[0017] Preferably, the monomer containing an epoxy group includes at least one of glycidyl methacrylate, glycidyl epoxy propyl methacrylate, epoxy chloropropane, and epoxy butyl methacrylate.

[0018] By adopting the technical scheme, the types of monomers containing an epoxy group are optimized, so that the flexibility and elasticity of the rubber are significantly enhanced to adapt to repeated bending during cleaning. At the same time, the modified rubber has better compatibility with the TPU, and the components are uniformly dispersed, improving the wear resistance and tear resistance of the bristles.

[0019] Preferably, the composite wear-resistant filler is composed of inorganic fillers with an average particle size of 20-100 nm, inorganic fillers with a particle size of 150-300 nm, and inorganic fillers with a particle size of 400-500 nm, in a weight ratio of (5-8):(3-5):1.

[0020] By adopting the technical scheme, the composite wear-resistant filler is composed of inorganic fillers with different particle sizes, which can cooperate with each other in the TPU matrix to form a more compact composite network structure. The small-particle-size fillers can be filled in the gaps between the large-particle-size fillers, making the entire filler system more compact, effectively preventing the invasion of external abrasive particles and scratches when encountering high-strength cleaning scenarios, such as cleaning rough ground or ground frequently contacted with sharp objects, and enhancing the wear resistance of the TPU bristles. At the same time, the inorganic fillers with different particle sizes cooperate with each other to disperse and bear the tearing force generated during cleaning, enhance the tear resistance of the TPU bristles when subjected to external force impact or sharp object scratching, reduce the risk of bristle tearing, and improve the durability of the bristles in complex cleaning environments.

[0021] Preferably, the diameter of the carbon fiber is 5-10 pm, and the length is 0.01-0.1 mm.

[0022] By optimizing the length and diameter of the carbon fiber, the specific surface area of the carbon fiber is larger, and the contact area with the TPU matrix is wider, which can form stronger interfacial bonding force. This helps the effective transmission of stress between the carbon fiber and the matrix, thereby improving the overall strength of the composite material. At the same time, the shorter carbon fiber can be more uniformly dispersed in the matrix, avoiding agglomeration, and forming a more dense network structure in the material. Such structural optimization not only enhances the wear resistance of the composite material, making it better resist the friction generated during cleaning, but also improves the tear resistance, making the bristles less likely to be torn when encountering sharp objects.

[0023] Preferably, the compatibilizer is composed of TPU-g-MAH and EPDM-g-MAH in a weight ratio of 1:(2-4).

[0024] By optimizing the type and amount of the 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. At the same time, it can also enhance the flexibility and elasticity of the composite material, ensuring that the bristles are not easily broken in high-strength cleaning scenarios, prolonging the service life.

[0025] Preferably, the silane coupling agent includes one of γ-aminopropyl triethoxysilane, 3-glycidyl ether propyl triethoxysilane, γ-glycidyl ether propyl trimethoxysilane, N-β-(aminoethyl)-γ-aminopropyl trimethoxysilane, γ-glycidyl ether propyl triethoxysilane, and γ-methacryloyloxy propyl trimethoxysilane.

[0026] By optimizing the type of silane coupling agent, the bonding force between inorganic fillers, carbon fibers, etc. and the TPU matrix is further improved. At the same time, the fillers and fibers are uniformly dispersed, avoiding agglomeration, thereby improving the mechanical properties and wear resistance of the material.

[0027] Preferably, the antioxidant includes one or more of 1010, 168, 1035, 1098, 1076, 1135, or 1024.

[0028] By optimizing the type of antioxidant, the molecular structure of the TPU composite material can be stabilized, preventing molecular chain rupture or crosslinking due to oxidation, thereby maintaining the stability of the mechanical properties and physical properties of the material, and ensuring that the bristles can still maintain good wear resistance and flexibility after long-term use.

[0029] In a second aspect, the application provides a method for preparing a high-wear-resistant TPU composite material for a cleaning brush of a sweeping robot, which adopts the following technical solution: A method for preparing a high-wear-resistant TPU composite material for a cleaning brush of a sweeping robot, comprising the following steps: S1, mixing TPU, modified rubber, composite wear-resistant filler, carbon fiber, modifier, silane coupling agent, antioxidant and compatibilizer to obtain a mixture; S2, extruding and granulating the mixture in a screw machine to obtain a high-wear-resistant TPU composite material for a cleaning brush of a sweeping robot.

[0030] By adopting the above technical solution, the components can be fully and uniformly dispersed, and the components can be fully fused under the action of high temperature and shear force through extrusion and granulation in a screw machine, forming a stable composite network structure. This process not only is simple and easy to operate and easy to industrialize, but also can effectively improve the wear resistance, flexibility and elasticity of the material, so that the cleaning brush performs well in high-strength cleaning scenarios and prolongs the service life, while ensuring that the bristles are not easily broken or deformed, and adapting to various cleaning needs.

[0031] In summary, the application has the following beneficial effects: 1. The high-wear-resistant TPU composite material significantly improves the performance of the cleaning brush of the sweeping robot through the synergistic effect of multiple components. Its high wear resistance is due to the cooperation of the composite wear-resistant filler and the carbon fiber. The filler can disperse the friction force and prevent abrasive cutting, and the carbon fiber provides skeletal support to enhance the tensile and shear resistance. The modified rubber enhances the flexibility and elasticity, so that the bristles can better adhere to the ground and are not easily broken. The glycidyl methacrylate grafted ethylene-octene copolymer in the modifier improves the compatibility, the hyperbranched polyether ether ketone improves the interfacial bonding strength, the polyamide imparts lubricity and flexibility, and the friction coefficient is reduced. The silane coupling agent further enhances the interfacial bonding force. This composite material can effectively prevent the bristles from premature wear and deformation in high-strength cleaning scenarios, prolong the service life, while maintaining good flexibility and elasticity, and adapting to various cleaning scenarios. DETAILED DESCRIPTION EMBODIMENT

[0032] The TPU is from Lubrizol, model 2363-90AE. The modified rubber is from Dow Chemical, model EPDM 4725P.

[0033] The glycidyl methacrylate grafted ethylene-octene copolymer is purchased from Dongguan Shenghao Plastic Raw Material Co., Ltd., model SH035.

[0034] The styrene-butadiene-styrene block copolymer was purchased from Suzhou Ranpu Import & Export Co., Ltd., and its grade is 3542.

[0035] The polyamide was purchased from Suzhou Ranpu Import & Export Co., Ltd., and its brand name is DuPont CELANESE.

[0036] The EPDM rubber was purchased from Shanghai Jinju International Trade Co., Ltd., model number 2650C.

[0037] The TPU-g-MAH was purchased from Dongguan Shenghao Plastic Raw Materials Co., Ltd., and its model number is TPU-G-MAH.

[0038] EPDM-g-MAH was purchased from Shenzhen Huixin Plastics & Chemical Co., Ltd., product number Royaltuf.

[0039] Example 1 A highly abrasion-resistant TPU composite material for cleaning brushes in robotic vacuum cleaners is prepared by the following method: 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. 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.

[0040] 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.

[0041] 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.

[0042] The carbon fiber has a diameter of 5μm and a length of 0.01mm.

[0043] The compatibilizer is composed of TPU-g-MAH and EPDM-g-MAH in a weight ratio of 1:2.

[0044] 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. Table 1. Types, dosages, and parameters of raw materials for preparing high-abrasion-resistant TPU composite materials for robot vacuum cleaner brushes. 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.

[0045] 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.

[0046] 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.

[0047] Example 4 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: 1) Mix 10g of monomer containing epoxy groups (glycidyl methacrylate) with 300g of organic solvent (toluene) to obtain a mixed solution; 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.

[0048] Example 5 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: 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; 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.

[0049] Example 6 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.

[0050] Example 6 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.

[0051] Example 7 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.

[0052] Comparative Example Comparative Example 1 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.

[0053] Comparative Example 2 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.

[0054] Comparative Example 3 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.

[0055] Comparative Example 4 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.

[0056] Comparative Example 5 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.

[0057] The molecular weight of polyethylene is 5000 when heated.

[0058] Comparative Example 6 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.

[0059] Detection methods / test methods Sample preparation: 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).

[0060] Parameter settings: Reciprocating frequency: set to 10Hz to simulate the rapid reciprocating motion of the brush bristles during the cleaning process.

[0061] Reciprocating stroke: set to 10mm to simulate the contact distance between the brush bristles and the ground.

[0062] Load: Apply a vertical load of 10N to simulate the pressure of the brush bristles on the ground during the cleaning process.

[0063] Test time: Set to 30 minutes to ensure sufficient time for wear observation.

[0064] After the test, the depth and width of the scratches were measured.

[0065] 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.

[0066] Bending parameter settings: Bending angle: Set to 180° to simulate the maximum bending angle that the brush bristles may encounter during the cleaning process.

[0067] Bending speed: Select 10mm / min to simulate the bending rate in actual use.

[0068] Cycle count: set to 15,000 cycles to evaluate the fatigue resistance of the material.

[0069] 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.

[0070] Elongation at break for fracture strength: Refer to GB / T 14344-2022. Experimental data are shown in Table 2: Table 2. Experimental data of Examples 1-7 and Comparative Examples 1-6 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.

[0071] 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.

[0072] In Comparative Example 6, the excessive amount of composite filler improved the wear resistance but reduced the flexibility.

[0073] 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.

[0074] 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.

[0075] 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 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.

2. The high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners according to claim 1, characterized in that, 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 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.

3. The high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners according to claim 2, characterized in that: The monomer containing an epoxy group includes at least one of glycidyl methacrylate, glycidyl methacrylate, epichlorohydrin, and glycidyl methacrylate.

4. The high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners according to claim 2, characterized in that: The weight ratio of the monomer containing epoxy groups, the EPDM rubber, and the initiator is (10-30):100:(0.5-2).

5. 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.

6. The high wear-resistant TPU composite material for cleaning brushes of robotic vacuum cleaners according to claim 4, characterized in that: The carbon fiber has a diameter of 5-10 μm and a length of 0.01-0.1 mm.

7. 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).

8. 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.

9. 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.

10. 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 1-9, 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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