Polyurethane-based wear-resistant sponge, preparation method thereof and application of polyurethane-based wear-resistant sponge in preparation of cleaning products

Abstract

The invention relates to the field of building materials, in particular to polyurethane-based wear-resistant sponge, a preparation method thereof and application of the polyurethane-based wear-resistant sponge in preparation of cleaning supplies. The polyurethane-based wear-resistant sponge is prepared from the following raw materials in parts by mass: polyether polyol, isocyanate, a graft copolymer material, reinforced fibers, a polymer additive, a dispersing agent, a foaming agent, a foam stabilizer, a catalyst and the like. According to the polyurethane-based wear-resistant sponge and the preparation method thereof provided by the invention, the polyurethane-based wear-resistant sponge has excellent wear resistance and structural stability at the same time, the toughness, tensile resistance and other mechanical properties of the polyurethane-based sponge are further enhanced, and meanwhile, the polyurethane-based sponge is endowed with good temperature inductivity, so that the polyurethane-based wear-resistant sponge has different use characteristics at high and low temperatures; furthermore, the performance contradiction of the existing polyurethane sponge in the aspects of wear resistance and softness is balanced, the polyurethane sponge has excellent application performance in a specific temperature difference environment, and the comprehensive performance requirement of the existing sponge product is met.

Description

Technical Field

[0001] The present application relates to the field of sponge materials, and more specifically to a polyurethane-based wear-resistant sponge and a preparation method thereof. Background Art

[0002] Polyurethane (PU) is a synthetic material widely used in industry and daily life, favored for its outstanding physical properties, including abrasion resistance, tear resistance, elasticity, and chemical resistance. Polyurethane sponge, a porous polyurethane material, inherits these advantages while also offering excellent cushioning and sound absorption properties. Consequently, it is widely used in furniture, bedding, automotive interiors, and cleaning products.

[0003] Polyurethane-based wear-resistant sponge is a special type of sponge prepared through a specific formula and process. Its internal structure has been optimized to give it higher durability and wear resistance. This sponge usually uses polyols and isocyanates as the main raw materials, and forms a complex three-dimensional network structure through a foaming process. In addition, in order to enhance its wear resistance, some additives such as reinforcing agents, stabilizers or fillers may be added to improve the mechanical properties and service life of the material. And due to the unique physical properties of polyurethane-based wear-resistant sponge, polyurethane-based wear-resistant sponge is particularly suitable for the manufacture of high-quality cleaning products, such as kitchen scrubbing sponges, bathroom cleaning tools, etc. This type of sponge can effectively remove stains without scratching the surface, and is easy to clean and dries quickly, greatly improving cleaning efficiency and user experience. However, in recent years, although polyurethane-based wear-resistant sponges prepared by existing technologies have performed well in many aspects, there are still some difficult problems to deal with. For example, how to effectively meet the requirements of excellent wear resistance and structural stability of polyurethane-based sponges at the same time, and how to further enhance the mechanical properties of polyurethane-based sponges such as toughness and tensile resistance, and at the same time give it good temperature sensitivity, so that it has higher hardness in low temperature environments, enhancing the scraping ability during cleaning; and softening at higher temperatures, facilitating deformation and cleaning operations, and improving flexibility of use. Summary of the Invention

[0004] Therefore, in order to effectively solve the above-mentioned existing problems, the present application provides a polyurethane-based wear-resistant sponge and a preparation method thereof, which not only has excellent wear resistance and structural stability at the same time, but also further enhances the mechanical properties of the polyurethane-based sponge such as toughness and tensile resistance, and at the same time gives it good temperature sensitivity, so that it has different usage characteristics at high and low temperatures, thereby balancing the performance contradictions of existing polyurethane sponges in terms of wear resistance and softness, and has excellent application performance under specific temperature difference environments, meeting the comprehensive performance requirements of existing sponge products.

[0005] A polyurethane-based wear-resistant sponge comprises the following raw materials, calculated by weight: 45-60 parts of polyether polyol, 25-35 parts of isocyanate, 10-22 parts of graft copolymer material, 6-12 parts of reinforcing fiber, 4-8 parts of polymer additive, 0.8-1.8 parts of dispersant, 1-5 parts of foaming agent, 0.3-0.8 parts of foam stabilizer, 0.2-0.5 parts of antioxidant, 0.8-1.5 parts of cross-linking agent, and 0.05-0.1 parts of catalyst.

[0006] As a preferred embodiment, the polyether polyol is at least one of polyoxypropylene triol, polytetramethylene ether glycol, polyethylene oxide-propylene oxide cotriol and polyoxypropylene tetraol.

[0007] As a preferred solution, the weight average molecular weight of the polyether polyol is 2000 to 5000 Da.

[0008] As a preferred embodiment, the polyether polyol is polyoxypropylene triol.

[0009] As a preferred embodiment, the isocyanate is at least one of diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

[0010] As a preferred embodiment, the isocyanate is diphenylmethane diisocyanate.

[0011] As a preferred solution, the mass ratio of the polyether polyol, isocyanate and graft copolymer is (50-55): (30-35): (15-20).

[0012] As a preferred solution, the mass ratio of the polyether polyol, isocyanate and graft copolymer is (50-53): (30-32): (16-18).

[0013] As a preferred embodiment, the preparation method of the graft copolymer material specifically includes the following steps: S1: putting a polyurethane prepolymer and N-methylpyrrolidone into a reaction kettle, heating and stirring until dissolved; S2: adding styrene, N-isopropylacrylamide and dodecafluoroheptyl methoxyacrylate in three steps, then adding azobisisobutyronitrile under nitrogen protection, reacting, removing residual monomers, and distilling under reduced pressure to obtain the graft copolymer material.

[0014] As a preferred embodiment, the preparation method of the graft copolymer material specifically includes the following steps: S1: putting a polyurethane prepolymer and N-methylpyrrolidone into a reaction kettle, heating to 80-85°C and stirring until dissolved; S2: adding styrene, N-isopropylacrylamide and dodecafluoroheptyl methoxyacrylate in three times, each time with an interval of 30-35 minutes, then adding azobisisobutyronitrile under nitrogen protection, reacting at 80-85°C for 4-5 hours, then heating to 95-100°C to remove residual monomers, and removing N-methylpyrrolidone by reduced pressure distillation to obtain the graft copolymer material.

[0015] As a preferred solution, the mass ratio of the polyurethane prepolymer, styrene, N-isopropylacrylamide and dodecafluoroheptyl methoxyacrylate is (5-8): (1-2): (1-2): (0.4-0.8).

[0016] As a preferred solution, the mass ratio of the polyurethane prepolymer, styrene, N-isopropylacrylamide and dodecafluoroheptyl methoxyacrylate is (6-6.5): (1.3-1.6): (1.4-1.5): (0.6-0.7).

[0017] The addition of graft copolymers can effectively improve the wear resistance, aging resistance, and mechanical properties of polyurethane-based wear-resistant sponges, and further achieve the temperature-sensitive characteristics of polyurethane-based sponges, balancing the contradiction between softness and wear resistance. The hydrophobic chain segments of N-isopropylacrylamide contained in it can form a physical cross-linked network through hydrogen bonds at low temperatures, restricting the movement of molecular chains, improving the hardness of the sponge, and helping to increase the crystallinity of the polyether polyol soft segment, and jointly increasing the rigidity with the NIPAM network. At high temperatures, it promotes the melting of the soft segment, which in turn promotes the hydrophilization of the chain segment, decrosslinking the network, and softening the material, thereby achieving temperature-sensitive control of the polyurethane-based sponge and facilitating the use of the sponge.

[0018] On the other hand, the rigid styrene segments contained within the polyurethane soft segment matrix increase the modulus to resist frictional stress, while the fluorinated segments accumulate on the surface to form a low surface energy layer, reducing the coefficient of friction. Furthermore, the fluorine atoms in the C-F bonds have high electronegativity, forming a dense surface layer that blocks the penetration of UV-activated oxygen free radicals and assists the hindered phenol groups in capturing free radicals, interrupting the chain oxidation reaction. This enhances the sponge's wear resistance and aging resistance while also improving the physical entanglement between the long styrene chains and the polyurethane backbone, thereby increasing resistance to molecular chain slippage under external forces and further improving mechanical properties.

[0019] As a preferred solution, the reinforcing fiber is ultrafine glass fiber.

[0020] As a preferred solution, the average diameter of the ultrafine glass fibers is 5 to 8 μm.

[0021] As a preferred solution, the average length of the ultrafine glass fibers is 100 to 300 μm.

[0022] As a preferred solution, the average length of the ultrafine glass fibers is 150 to 200 μm.

[0023] As a preferred solution, the polymer auxiliary agent is a composition of polytetrafluoroethylene and sodium polyacrylate.

[0024] As a preferred solution, the mass ratio of polytetrafluoroethylene to sodium polyacrylate is (5-6): (0.8-1.5).

[0025] As a preferred solution, the mass ratio of polytetrafluoroethylene to sodium polyacrylate is (5-5.2): (1-1.2).

[0026] As a preferred solution, the dispersant is at least one of polyether-modified silicone, acrylates, phosphates and organic amine salts.

[0027] As a preferred solution, the dispersant is polyether-modified silicone BYK-111.

[0028] As a preferred embodiment, the foaming agent is at least one of deionized water, n-pentane, cyclopentane and sodium bicarbonate.

[0029] As a preferred solution, the foaming agent is deionized water.

[0030] As a preferred solution, the foam stabilizer is at least one of polyether-modified silicone oils, high molecular weight polyethers and silicones.

[0031] As a preferred solution, the foam stabilizer is polyether-modified silicone oil.

[0032] As a preferred embodiment, the antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant DLTP, antioxidant TNP and antioxidant 1135.

[0033] As a preferred embodiment, the antioxidant is antioxidant 1135.

[0034] As a preferred embodiment, the cross-linking agent is an aziridine derivative or triglycidyl isocyanurate.

[0035] As a preferred embodiment, the cross-linking agent is an aziridine derivative.

[0036] As a preferred embodiment, the catalyst is at least one of bismorpholinyl ether, N,N-dimethylcyclohexylamine, stannous octoate and dibutyltin dilaurate.

[0037] As a preferred embodiment, the catalyst is bismorpholinyl ether.

[0038] A method for preparing a polyurethane-based wear-resistant sponge specifically comprises the following steps: S1: adding polyether polyol, graft copolymer material, reinforcing fiber and polymer additive into a reaction kettle, and stirring at 50-60°C at a rotation speed of 500-600 rpm for 30-40 min; S2: adding all remaining raw materials, rapidly stirring at 1200-1400 rpm for 5-8 min, and then injecting into a mold, foaming at a constant temperature of 50-55°C for 30-40 min to form an open pore structure, aging at 80-85°C for 2-2.5 h to complete the construction of the cross-linked network, and heat treating at 110-120°C for 20-30 min to activate the temperature-sensitive groups; S3: after completion, naturally cooling to room temperature and cutting into shape, treating the surface with high-frequency plasma at a power of 50-55W for 2-3 min, and then aging in an environment with a humidity of 45-50% RH for 20-22 h to complete the preparation.

[0039] The present application further defines the use of polyurethane-based wear-resistant sponge in the preparation of cleaning products.

[0040] This application has the following beneficial effects:

[0041] 1. The polyurethane-based wear-resistant sponge provided in the present application not only has excellent wear resistance and structural stability, but also further enhances the mechanical properties of the polyurethane-based sponge, such as toughness and tensile resistance, and at the same time gives it good temperature sensitivity, so that it has different usage characteristics at high and low temperatures, thereby balancing the performance contradictions of existing polyurethane sponges in terms of wear resistance and softness, and has excellent application performance under specific temperature difference environments, meeting the comprehensive performance requirements of existing sponge products.

[0042] 2. The polyurethane-based wear-resistant sponge provided in this application can effectively improve the wear resistance, aging resistance and mechanical properties of the polyurethane-based wear-resistant sponge by adding a graft copolymer material, and further can achieve the temperature-sensitive characteristics of the polyurethane-based sponge, balancing the contradiction between softness and wear resistance. The hydrophobic segment of N-isopropylacrylamide contained in it can form a physical cross-linked network through hydrogen bonds at low temperatures, restricting the movement of molecular chains, improving the hardness of the sponge, and helping to improve the crystallinity of the polyether polyol soft segment, and jointly increasing the rigidity with the NIPAM network. At high temperatures, it promotes the melting of the soft segment, which in turn promotes the hydrophilization of the segment, the decrosslinking of the network, and the softening of the material, thereby achieving temperature-sensitive control of the polyurethane-based sponge and facilitating the use of the sponge.

[0043] 3. The polyurethane-based wear-resistant sponge provided in this application, the reinforcing fiber material and polymer additive added thereto can assist the grafted copolymer material, and work together to improve the comprehensive performance of the polyurethane-based sponge, especially to solve the contradiction between wear resistance and softness, provide a good internal system foundation for the temperature sensing performance of the sponge, and greatly improve the enhanced mechanical properties and wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is an electron microscope image of the internal structure of the polyurethane-based wear-resistant sponge prepared in Example 1 of the present application.

[0045] Figure 2 This is an electron microscope image of the internal structure of the polyurethane-based wear-resistant sponge prepared in Comparative Example 1 of this application. DETAILED DESCRIPTION

[0046] Example 1

[0047] Polyurethane-based wear-resistant sponge, polyurethane-based wear-resistant sponge, calculated by mass, the raw materials are composed of the following components: 52.4 parts of polyether polyol, 31.5 parts of isocyanate, 16.8 parts of graft copolymer, 8.2 parts of reinforcing fiber, 6.5 parts of polymer additives, 1.4 parts of dispersant, 2.1 parts of foaming agent, 0.5 parts of foam stabilizer, 0.3 parts of antioxidant, 1.2 parts of cross-linking agent, and 0.08 parts of catalyst.

[0048] The polyether polyol is polyoxypropylene triol with a weight average molecular weight of 4600 Da, and is purchased from the Dow Chemical Company in the United States as a product of model Voranol-4701.

[0049] Isocyanate is diphenylmethane diisocyanate, which was purchased from Covestro, Germany, and is a 44V20L product.

[0050] The preparation method of the graft copolymer material specifically includes the following steps: S1: putting 6.2 parts of polyurethane prepolymer and 20 parts of N-methylpyrrolidone into a reactor, heating to 80°C and stirring until dissolved; S2: adding 1.5 parts of styrene, 1.4 parts of N-isopropylacrylamide and 0.6 parts of dodecafluoroheptyl methoxyacrylate in three times in sequence, each time with an interval of 30 minutes, then adding 0.05 parts of azobisisobutyronitrile under nitrogen protection, reacting at 80°C for 5 hours, then heating to 100°C to remove residual monomers, and removing N-methylpyrrolidone by reduced pressure distillation to obtain the graft copolymer material.

[0051] The polyurethane prepolymer is a polyurethane prepolymer product sold by Hubei Yamade Biopharmaceutical Co., Ltd. in China, with an NCO content of 8.5%.

[0052] The reinforcing fibers are ultrafine glass fibers with an average diameter of 5.8 μm and an average length of 180 μm.

[0053] The polymer auxiliary agent is a composition of polytetrafluoroethylene, ethylene-vinyl acetate copolymer and sodium polyacrylate, with a mass ratio of 5.2:2.4:1.

[0054] Polytetrafluoroethylene powder was purchased from Shanghai Zhaohe Plastics Co., Ltd., China, as a L-2 product.

[0055] Sodium polyacrylate was purchased as a first-grade product from Shuangcheng Chemical Products Factory in Renqiu, China.

[0056] The dispersant is polyether-modified siloxane BYK-111; the foaming agent is deionized water; the foam stabilizer is polyether-modified silicone oil Evonik B-8469; the antioxidant is antioxidant 1135; the crosslinking agent is an aziridine derivative, the premium polyaziridine crosslinker SaC-100 purchased from Hubei Xinjiecheng Chemical Technology Co., Ltd. in China; and the catalyst is bismorpholinyl ether.

[0057] The preparation method of polyurethane-based wear-resistant sponge specifically includes the following steps: S1: polyether polyol, graft copolymer material, reinforcing fiber and polymer additive are put into a reactor, and stirred at 550 rpm at 55°C for 30 minutes; S2: all remaining raw materials are added, and the mixture is rapidly stirred at 1200 rpm for 5 to 8 minutes, and then injected into a mold, foamed at a constant temperature of 55°C for 30 minutes to form an open pore structure, matured at 85°C for 2 hours to complete the cross-linking network construction, and heat treated at 120°C for 25 minutes to activate temperature-sensitive groups; S3: after completion, naturally cooled to room temperature and cut into shape, the surface is treated with high-frequency plasma at a power of 50W for 2 minutes, and then matured in an environment with a humidity of 50% RH for 22 hours to complete the preparation.

[0058] The internal structure of the polyurethane-based wear-resistant sponge prepared in this embodiment is shown in the electron microscope image. Figure 1 shown.

[0059] Example 2

[0060] The only difference between this embodiment and Example 1 is that the polyurethane-based wear-resistant sponge, the polyurethane-based wear-resistant sponge, is composed of the following raw materials, in parts by mass: 54.8 parts of polyether polyol, 34.2 parts of isocyanate, 15.5 parts of graft copolymer, 8.4 parts of reinforcing fiber, 6.8 parts of polymer additives, 1.6 parts of dispersant, 2.4 parts of foaming agent, 0.6 part of foam stabilizer, 0.4 part of antioxidant, 1.3 parts of cross-linking agent, and 0.09 part of catalyst.

[0061] Example 3

[0062] The only difference between this embodiment and embodiment 1 is that the polymer auxiliary agent is a composition of polytetrafluoroethylene, ethylene-vinyl acetate copolymer and sodium polyacrylate, with a mass ratio of 6:2:1.5.

[0063] Comparative Example 1

[0064] The only difference between this comparative example and Example 1 is that the polyurethane-based wear-resistant sponge, the polyurethane-based wear-resistant sponge, is composed of the following raw materials, in parts by mass: 52.4 parts of polyether polyol, 31.5 parts of isocyanate, 8.5 parts of graft copolymer, 8.2 parts of reinforcing fiber, 6.5 parts of polymer additives, 1.4 parts of dispersant, 2.1 parts of foaming agent, 0.5 part of foam stabilizer, 0.3 part of antioxidant, 1.2 parts of cross-linking agent, and 0.08 part of catalyst.

[0065] The internal structure electron microscope picture of the polyurethane-based wear-resistant sponge prepared in this comparative example is as follows Figure 1 shown.

[0066] Comparative Example 2

[0067] The only difference between this comparative example and Example 1 is that the polyurethane-based wear-resistant sponge, the polyurethane-based wear-resistant sponge, is composed of the following raw materials, in parts by mass: 52.4 parts of polyether polyol, 31.5 parts of isocyanate, 25.5 parts of graft copolymer, 8.2 parts of reinforcing fiber, 2.5 parts of polymer additives, 1.4 parts of dispersant, 2.1 parts of foaming agent, 0.5 part of foam stabilizer, 0.3 part of antioxidant, 1.2 parts of cross-linking agent, and 0.08 part of catalyst.

[0068] Comparative Example 3

[0069] The only difference between this comparative example and Example 1 is that the polymer auxiliary agent is a composition of polytetrafluoroethylene, ethylene-vinyl acetate copolymer and sodium polyacrylate, with a mass ratio of 2:4:0.3.

[0070] Comparative Example 4

[0071] The only difference between this comparative example and Example 1 is that the polymer auxiliary agent is a composition of polytetrafluoroethylene, ethylene-vinyl acetate copolymer and sodium polyacrylate, with a mass ratio of 5:0.5:1.2.

[0072] Comparative Example 5

[0073] The only difference between this comparative example and Example 1 is as follows: The preparation method of the graft copolymer material specifically comprises the following steps: S1: 15.5 parts of polyurethane prepolymer and 20 parts of

[0074] N-methylpyrrolidone was added into the reaction kettle, heated to 80°C and stirred until dissolved; S2: 1.2 parts of styrene, 1.2 parts of N-isopropylacrylamide and 0.1 parts of dodecafluoroheptyl methoxyacrylate were added in sequence three times, with an interval of 30 minutes each time, and then 0.04 parts of azobisisobutyronitrile was added under nitrogen protection and reacted at 80°C for 5 hours, and then the temperature was raised to 100°C to remove residual monomers, and N-methylpyrrolidone was removed by reduced pressure distillation to obtain the product.

[0075] Comparative Example 6

[0076] This comparative example differs from Example 1 only in the following: The preparation method of the graft copolymer material specifically comprises the following steps: S1: 6.2 parts of polyurethane prepolymer and 20 parts of N-methylpyrrolidone are placed in a reaction kettle, heated to 80° C. and stirred until dissolved;

[0077] S2: 2.8 parts of styrene, 0.2 parts of N-isopropylacrylamide and 1.5 parts of dodecafluoroheptyl methoxyacrylate were added in three times, with an interval of 30 minutes between each addition. Then, 0.05 parts of azobisisobutyronitrile were added under nitrogen protection and the mixture was reacted at 80°C for 5 hours. The mixture was then heated to 100°C to remove residual monomers and N-methylpyrrolidone was removed by distillation under reduced pressure to obtain the product.

[0078] Performance Tests of Examples and Comparative Examples

[0079] 1. Temperature Sensitivity Test: Cut the sample into 25mm × 25mm × 10mm squares and place them in a constant temperature chamber to equilibrate to 25°C and 40°C respectively. Use a Shore A durometer to measure the hardness value at each temperature. Measure each temperature point 5 times and take the average value. The results are recorded in Table 1.

[0080] 2. Wear resistance test: The samples were cut into 100 mm × 100 mm × 10 mm squares and pre-ground 50 times to eliminate surface unevenness. A CS-10 grinding wheel was used with a load of 1 kg and a rotation speed of 60 rpm for 500 cycles. The mass loss before and after wear was weighed, and the wear loss per unit cycle (mg / 500 times) was calculated and recorded in Table 1.

[0081] 3. Mechanical test: Tested according to GB / T6344 standard, and the elongation at break results were obtained by taking the average of 10 tests and entering them into Table 1.

[0082] 4. Aging resistance test: Tested according to ASTM G154-16, UV lamp wavelength 340nm, irradiation intensity 0.89W / m 2 , 60℃ light 4h to 50℃ condensation 4h, cycle 500h, test the retention rate of elongation at break before and after aging, take the average of 10 tests and enter it in Table 1.

[0083] Table 1 Test results of the embodiments and comparative examples

[0084]

[0085] Judging from the final performance test results of the embodiments and comparative examples, comparative examples 1 to 6 achieved worse performance results than the embodiments, while the embodiments, through the better technical scheme defined in the present application, produced graft copolymers with better performance, and promoted the combined effect of reinforcing fiber materials, polymer additives and graft copolymer materials, thereby improving the comprehensive performance of polyurethane-based sponges, especially being able to resolve the contradiction between wear resistance and softness, providing a good internal system foundation for the temperature sensitivity of the sponge, and greatly improving the enhanced mechanical properties and wear resistance.

Claims

1. A polyurethane-based wear-resistant sponge, characterized in that: The raw materials include, by mass: 45-60 parts of polyether polyol, 25-35 parts of isocyanate, 10-22 parts of graft copolymer, 6-12 parts of reinforcing fiber, 4-8 parts of polymer additive, and 1-5 parts of foaming agent; The preparation method of the graft copolymer material comprises: S1: placing a polyurethane prepolymer and N-methylpyrrolidone into a reaction kettle, heating and stirring until dissolved; S2: adding styrene, N-isopropylacrylamide and dodecafluoroheptyl methoxyacrylate in three steps, then adding azobisisobutyronitrile under nitrogen protection, reacting, removing residual monomers, and performing reduced pressure distillation to obtain the graft copolymer material; The mass ratio of the polyurethane prepolymer, styrene, N-isopropylacrylamide and dodecafluoroheptyl methoxyacrylate is (5-8): (1-2): (1-2): (0.4-0.8).

2. The polyurethane-based wear-resistant sponge according to claim 1, characterized in that: The polyether polyol is at least one of polyoxypropylene triol, polytetramethylene ether glycol, polyethylene oxide-propylene oxide copolymer triol and polyoxypropylene tetraol.

3. The polyurethane-based wear-resistant sponge according to claim 2, characterized in that: The isocyanate is at least one of diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

4. The polyurethane-based wear-resistant sponge according to claim 3, characterized in that: The mass ratio of the polyether polyol, isocyanate and graft copolymer is (50-55): (30-35): (15-20).

5. The polyurethane-based wear-resistant sponge according to claim 4, characterized in that: The weight average molecular weight of the polyether polyol is 2000 to 5000 Da.

6. The polyurethane-based wear-resistant sponge according to claim 5, characterized in that: The reinforcing fibers are ultrafine glass fibers, and the average diameter of the ultrafine glass fibers is 5 to 8 μm, and the average length is 100 to 300 μm.

7. The polyurethane-based wear-resistant sponge according to claim 6, characterized in that: The polymer auxiliary agent is a composition of polytetrafluoroethylene powder and sodium polyacrylate, with a mass ratio of (5-6): (0.8-1.5).

8. The polyurethane-based wear-resistant sponge according to claim 7, characterized in that: Calculated by mass, the raw materials further include: 0.8 to 1.8 parts of dispersant, 0.3 to 0.8 parts of foam stabilizer, 0.2 to 0.5 parts of antioxidant, 0.8 to 1.5 parts of cross-linking agent, and 0.05 to 0.1 parts of catalyst.

9. A method for preparing the polyurethane-based wear-resistant sponge according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Put polyether polyol, graft copolymer material, reinforcing fiber and polymer additive into a reactor, stir at 500-600 rpm for 30-40 minutes at 50-60°C; S2: Add all the remaining raw materials, stir rapidly at 1200-1400 rpm for 5-8 minutes, then inject into the mold, foam at a constant temperature of 50-55°C for 30-40 minutes to form an open pore structure, mature at 80-85°C for 2-2.5 hours to complete the cross-linking network construction, and heat treat at 110-120°C for 20-30 minutes to activate the temperature sensitive groups; S3: After completion, naturally cool to room temperature and cut into shape, treat the surface with high-frequency plasma at a power of 50-55W for 2-3 minutes, and then mature in an environment with a humidity of 45-50% RH for 20-22 hours to complete.

10. Use of the polyurethane-based wear-resistant sponge according to any one of claims 1 to 8 in the preparation of cleaning products.

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