Low-friction damping polyurethane composite material, preparation method and application thereof

Abstract

This invention discloses a low-friction, vibration-damping polyurethane composite material, comprising a thermoplastic polyurethane matrix and DMSN-PEI-HA-PDA NPs functional filler dispersed in the matrix. The DMSN-PEI-HA-PDA NPs functional filler consists of a three-network hydrogel layer formed by dendritic mesoporous silica nanoparticles (DMSN NPs) as the core and sequentially coated with PEI, HA, and PDA. The mass fraction of the DMSN-PEI-HA-PDA NPs functional filler in the polyurethane composite material is 0.5-2.5%. This invention uses DMSN NPs as a rigid template, coating its surface with a multi-component PEI-HA-PDA gelling agent. This not only preserves the mesoporous morphology of the hard core to construct a strong mechanical interlocking interface between the filler and the matrix, but also possesses the water absorption and hydration lubrication properties of PEI-HA-PDA gel. During friction, DMSN-PEI-HA-PDA... NPs induce the formation of micro-protrusion structures on the wear surface. The encapsulated PEI-HA-PDA gel layer absorbs water and swells, forming a hydrated lubricating film with a certain strength on the micro-protrusion surface. Compared with pure TPU material, the composite material shows a 64.2% reduction in COF and a 55% reduction in wear rate under water lubrication conditions.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to a polyurethane composite material, its preparation method, and its application. Background Technology

[0002] Compared to traditional oil lubrication systems, water lubrication technology has advantages such as being environmentally friendly and having low maintenance costs. However, the low viscosity of water makes it difficult for the boundary lubrication film to exist stably, often leading to abnormal friction and wear, and even causing severe vibration and noise behavior. This poses a huge challenge to the development and application of high-performance water lubrication materials.

[0003] Thermoplastic polyurethane (TPU) is often used as a matrix material for water-lubricated friction pairs due to its excellent wear resistance, high elasticity, and chemical modifiability. However, pure TPU materials are prone to severe interfacial deformation and adhesive wear failure under water lubrication conditions. The root cause of this problem lies in the insufficient dynamic stability of the water lubrication film on the TPU surface. By adding solid lubricants, surface grafting modification, and biomimetic lubrication design, a stable friction interface and a durable lubrication mechanism can be constructed, which helps to improve the material's water lubrication performance and thus suppress or eliminate frictional vibration and noise behavior.

[0004] Hydrogels are three-dimensional cross-linked polymer materials composed of a hydrophilic polymer network. They can absorb and lock in large amounts of water while remaining insoluble in water, maintaining their solid shape. Their unique water-lubricating properties originate from a hydration layer formed on their surface. This layer acts as a fluid film at the sliding interface, effectively reducing direct contact friction between solids, thus achieving an ultra-low coefficient of friction. However, due to the poor dimensional stability of gel particles and the weak interfacial interaction with the matrix material, gel particles are prone to detaching from the matrix under cyclic shear forces, leading to lubrication failure. Summary of the Invention

[0005] To address the aforementioned issues, this invention combines DMSN NPs mesoporous materials as a carrier with lubricating hydrogels to prepare composite materials with excellent anti-wear and vibration reduction / noise reduction properties. This significantly improves the tribological properties of friction pair materials for engineering equipment under water-related conditions and extends their service life.

[0006] To achieve the above objectives, the following technical solution is adopted: A low-friction vibration-damping polyurethane composite material comprising a thermoplastic polyurethane (TPU) matrix and DMSN-PEI-HA-PDA NPs functional fillers dispersed in the matrix; The DMSN-PEI-HA-PDA NPs functional filler consists of a core of dendritic mesoporous silica nanoparticles (DMSN NPs) and a three-network hydrogel layer formed by sequentially coating the surface with polyethyleneimine (PEI), hyaluronic acid (HA) and polydopamine (PDA).

[0007] According to the above scheme, the mass fraction of the DMSN-PEI-HA-PDA NPs functional filler in the polyurethane composite material is 0.5-2.5%. In the optimized scheme, the mass fraction of the functional filler in the polyurethane composite material is 1.0-2.0%.

[0008] According to the above scheme, the DMSN NPs are composed of monodisperse spherical particles with an average particle size of 200-300 nm, exhibiting a unique central core-radial pore structure, with a BET surface area and cumulative pore volume of 350-450 m². 2 g -1 and 1.5-2.5 cm 3 g -1 Its average pore size is 15-25 nm.

[0009] According to the above scheme, the DMSN NPs are prepared by anion-assisted sol-gel method, including the following steps: In the presence of an alkaline catalyst, sodium salicylate and hexadecyltrimethylammonium bromide template agents were dissolved in water at 80°C; tetraethyl silicate, a silica precursor, was added dropwise for reaction; and the product was obtained after centrifugation, washing, and removal of the template agent.

[0010] According to the above scheme, the alkaline catalyst is 2-3 mg / mL triethanolamine; the mass ratio of the template agent sodium salicylate to hexadecyltrimethylammonium bromide is (2-2.5):1; and the concentration of the silica precursor tetraethyl silicate is 0.1-0.2 g / mL.

[0011] According to the above scheme, the preparation method of the DMSN-PEI-HA-PDA NPs functional filler includes the following steps: (1) DMSN NPs were dispersed in phosphate buffer solution (PBS, 20×, pH 7.2), PEI was added and stirred to react, and PEI-modified DMSN NPs were obtained by centrifugation; (2) Disperse the product of step (1) in deionized water, add HA solution to react, and centrifuge to remove free HA; (3) Disperse the product of step (2) in deionized water, add 1,4-butanediol diglycidyl ether, dopamine hydrochloride and sodium hydroxide to react and form PDA on the surface. After neutralization and washing, DMSN-PEI-HA-PDA NPs functional filler is obtained.

[0012] According to the above scheme, in step (1), the mass ratio of PEI to DMSN NPs is (0.6-0.8):1, the reaction temperature is 20-30℃, and the reaction time is 2-4h.

[0013] According to the above scheme, in step (3), the amount of dopamine hydrochloride added is 0.55-1 mg / mL, the amount of 1,4-butanediol diglycidyl ether added is 0.005-0.01 mg / mL, and the amount of sodium hydroxide added is 5-8 mg / mL; the reaction temperature is 40-50℃, and the reaction time is 10-14h.

[0014] This invention also provides a method for preparing the above-mentioned low-friction vibration-damping polyurethane composite material, comprising the following steps: Dry TPU granules are melt-blended with DMSN-PEI-HA-PDA NPs filler, crushed, and then injection molded.

[0015] In the optimized scheme, melt blending is carried out in a micro internal mixer at a mixing temperature of 180-200℃; the injection molding temperature is 170-190℃ and the injection pressure is 120-130MPa.

[0016] The present invention also provides the application of the above-mentioned low-friction and vibration-damping polyurethane composite material in water-lubricated friction-reducing and noise-reducing components.

[0017] According to the above scheme, the water-lubricated friction-reducing and noise-reducing components include a ship water-lubricated stern bearing, a water pump bearing, and a guide rail slider.

[0018] This invention uses DMSN NPs as a rigid framework and performs surface functionalization grafting of a polyethyleneimine-hyaluronic acid-polydopamine (PEI-HA-PDA) ternary gel system to form DMSN-PEI-HA-PDA NPs with gradient moduli, thereby preparing composite materials. The rigid silica framework of DMSN NPs forms a strong interfacial bond with the TPU matrix through mechanical interlocking. The surface-coated PEI-HA-PDA gel layer enhances lubrication performance through multiple mechanisms: PEI acts as a connecting phase between DMSN NPs and the gel network; the carboxyl groups of HA impart hydration capacity through ionization; and the catechol structure of PDA improves interfacial adhesion strength and maintains the integrity of the lubricating film. This strategy, through the synergistic effect of the rigid DMSN NPs core and the soft gel shell, ensures both strong interfacial bonding between the filler and the matrix and endows the material with excellent hydration and lubrication properties, providing a new approach to resolving the contradiction between interfacial strengthening and lubrication functionalization in water-lubricated composite materials. The prepared UHMWPE low-friction vibration-damping composite material showed significant reductions in friction coefficient, wear rate, frictional vibration, and noise under water lubrication conditions.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) DMSN NPs possess larger pore sizes, higher specific surface areas, and excellent chemical and thermal stability, making them ideal solid carrier materials. Combining them with lubricating hydrogels can provide a new strategy for developing novel water-lubricated polymer friction pairs. This invention synthesizes DMSN-PEI-HA-PDA NPs by introducing mesoporous DMSN NPs as a hard template and coating their surface with a PEI-HA-PDA multi-component gelling agent, thus preparing a composite material for water-lubricated friction pairs. This strategy not only preserves the mesoporous morphology of the hard core of DMSN NPs to construct a strong mechanical interlocking interface between the filler and the matrix, but also combines the water absorption and hydration lubrication properties of PEI-HA-PDA gel.

[0020] (2) During the friction process, DMSN-PEI-HA-PDA NPs induce the formation of micro-protrusion structures on the wear surface. The coated PEI-HA-PDA gel layer absorbs water and swells, forming a hydrated lubricating film with a certain strength on the micro-protrusion surface. Compared with pure TPU material, the composite material shows a 64.2% decrease in COF and a 55% decrease in wear rate under water lubrication conditions.

[0021] (3) Under the long-term and stable lubrication effect, the frictional excitation force and surface deformation of the contact surface are effectively weakened, thereby significantly reducing the vibration and noise caused by the friction of the composite material. When the content of functional filler DMSN-PEI-HA-PDANPs is 1~2wt.%, the frictional vibration intensity of the composite material is reduced by 83% and the sound pressure level is reduced by 2.42 dB. Attached Figure Description

[0022] Figure 1 This is the SEM image of the synthesized DMSN-PEI-HA-PDA NPs in this invention.

[0023] Figure 2 This is a TEM image of the synthesized DMSN-PEI-HA-PDA NPs in this invention.

[0024] Figure 3 Curves showing the change of friction coefficient over time for the TPU-based composite materials used in water-lubricated friction pairs prepared in Comparative Example 1 and Examples 1-5 under water lubrication conditions.

[0025] Figure 4 The average coefficient of friction of the TPU-based composite materials for water-lubricated friction pairs prepared in Comparative Example 1 and Examples 1-5 under water-lubricated conditions.

[0026] Figure 5 Wear rate of TPU-based composite materials for water-lubricated friction pairs prepared in Comparative Example 1 and Examples 1-5 under water-lubricated conditions.

[0027] Figure 6 SEM images of the worn surface of the TPU-based composite material for water-lubricated friction pairs prepared in Example 3 under water-lubricated conditions.

[0028] Figure 7 Friction vibration signals of TPU-based composite materials for water-lubricated friction pairs prepared in Comparative Example 1 and Example 3 under water-lubricated conditions.

[0029] Figure 8 Noise signals of TPU-based composite materials for water-lubricated friction pairs prepared in Comparative Example 1 and Example 3 under water-lubricated conditions. Detailed Implementation

[0030] The following embodiments further illustrate the technical solution of the present invention, but are not intended to limit the scope of protection of the present invention.

[0031] A specific embodiment provides dendritic mesoporous silica nanoparticles (DMSN NPs), and the preparation process is as follows: First, 0.068 g of TEA was added as an alkaline catalyst to 25 mL of deionized water and dispersed by stirring in an 80 °C water bath for 30 min. Then, 0.168 g of NaSal and 0.38 g of CTAB were added as template agents and stirring was continued for 1 h to ensure complete dissolution. Next, 4 mL of the silica precursor TEOS was slowly added dropwise to the mixed solution, and the reaction was continued for 2 h. During this process, TEOS condensed into silica on the surface of CTAB micelles with the assistance of salicylic acid anions. The product was collected by high-speed centrifugation (12000 rpm, 15 min) and washed repeatedly with water and ethanol to remove residual reactants. Finally, the product was washed (1 h, three times) with a mixed solution of hydrochloric acid and ethanol (hydrochloric acid: ethanol = 1:9) to remove surfactants. The obtained DMSN NPs powder was vacuum dried at 60 °C for 12 h. Nitrogen adsorption / desorption tests were performed using a fully automated specific surface area and porosity analyzer (ASAP 2460) to analyze the Brunauer–Emmett–Teller (BET) surface area and pore size distribution of the nanoparticles. The results showed that the sample consisted of monodisperse spherical particles with an average particle size of 200-300 nm, exhibiting a unique central core-radial pore structure. Its BET surface area and cumulative pore volume were 412.74 m². 2 g -1 and 2.04 cm 3 g -1 Its average pore size is 18.01 nm.

[0032] Using the aforementioned DMSN NPs as raw materials, a specific embodiment also provides a DMSN-PEI-HA-PDA NPs functional filler, the preparation process of which is as follows: 0.21 g of the obtained DMSN NPs were ultrasonically dispersed in 10.5 mL of PBS solution, and 0.15 g of PEI was added and stirred at room temperature for 3 h. After centrifugation, the solid was resuspended in 10.5 mL of deionized water and dispersed in a 45 °C water bath for 30 min. 10 mL of HA aqueous solution (2.5 mg / mL) was added and stirred in a 45 °C water bath for 3 h. The solid was then centrifuged and washed with deionized water to remove free HA. The resulting solid was dispersed in 10 mL of deionized water, and 0.08 mg of BDDE, 5 mg of DA, and 75 mg of NaOH were added. The mixture was stirred in a 45 °C water bath for 12 h. The mixture was then neutralized with dilute hydrochloric acid until the pH stabilized at 7.2, centrifuged, and washed with deionized water. The resulting DMSN-PEI-HA-PDA NPs powder was vacuum dried at 60 °C for 12 h. The SEM surface morphology and TEM mesoporous structure of the obtained DMSN-PEI-HA-PDA NPs multifunctional filler are shown in the figures below. Figure 1 and 2 As shown, the sample is composed of monodisperse spherical particles with an average particle size of 230 nm, exhibiting a unique central core-radial pore structure. The HRTEM image shows a clear radial pore wall structure.

[0033] A specific embodiment also provides a DMSN-PEI NPs functional filler, the preparation process of which is as follows: 0.21 g of the obtained DMSN NPs were ultrasonically dispersed in 10.5 mL of PBS solution, and 0.15 g of PEI was added and stirred at room temperature for 3 h. After centrifugation, the solid was resuspended in 10.5 mL of deionized water and dispersed by stirring in a 45 °C water bath for 30 min.

[0034] A specific embodiment also provides a DMSN-PEI-HA NPs functional filler, the preparation process of which is as follows: 0.21 g of the obtained DMSN NPs were ultrasonically dispersed in 10.5 mL of PBS solution, and 0.15 g of PEI was added and stirred at room temperature for 3 h. After centrifugation, the solid was resuspended in 10.5 mL of deionized water and dispersed by stirring in a 45°C water bath for 30 min. 10 mL of HA aqueous solution (2.5 mg / mL) was added and stirred in a 45°C water bath for 3 h. The solid was then centrifuged and the free HA was washed away with deionized water.

[0035] The composite material molding process in the comparative examples and embodiments is as follows: Dried TPU granules and DMSN-PEI-HA-PDA NPs filler particles were uniformly blended in a molten state using a micro-mixer. The mixed composite material was then cut into small particles using a crusher. The composite material particles were melted and injection molded at 180°C using an injection molding machine with an injection pressure of 125 MPa. Finally, TPU / DMSN-PEI-HA-PDA NPs composite materials with different filler contents were obtained. Specifically, pure TPU material with a DMSN-PEI-HA-PDA NPs filler content of 0 wt.% was Comparative Example 1; composite materials with DMSN-PEI-HA-PDA NPs filler contents of 0.5 wt.%, 1 wt.%, 1.5 wt.%, 2 wt.%, and 2.5 wt.% were Examples 1-5; a DMSN-PEI NPs functional filler content of 1 wt.% was used as Comparative Example 2; and a DMSN-PEI-HA NPs functional filler content of 1 wt.% was used as Comparative Example 3.

[0036] The tribological tests under water lubrication conditions were conducted on the reciprocating motion module of the Rtec friction and wear testing machine, with the mating parts of the kinematic pair being made of brass. φ A 10 mm ball was used, with a working load of 10 N, a reciprocating stroke of 10 mm, a frequency of 1 Hz (corresponding to a sliding speed of 0.02 m / s), and a working time of 30 min. Simultaneously, a three-dimensional vibration sensor mounted on the upper sample fixture and a sound pressure sensor fixed by an external fixture were used to synchronously collect vibration and noise signals during the stable friction process at a distance of 5 cm from the friction surface.

[0037] The friction coefficient and wear rate were recorded after 30 minutes of tribological testing, as shown in Table 1.

[0038] Table 1

[0039] As shown in Table 1, the average friction coefficient and wear rate of the composite material prepared in Comparative Example 2 (DMSN-PEI NPs functional filler content of 1 wt.%) are similar to those of pure TPU in Comparative Example 1, indicating that DMSN-PEI NPs alone do not have a friction-reducing and wear-resistant effect as a filler. However, as described in Comparative Example 3 (DMSN-PEI-HA NPs functional filler content of 1 wt.%), when HA is further added as a lubricating gel layer, the friction coefficient and wear rate of the composite material are significantly reduced compared to pure TPU in Comparative Example 1. However, compared to Example 2 (DMSN-PEI-HA-PDA NPs functional filler content of 1 wt.%), which has the same filler content, the average friction coefficient of the composite material in Comparative Example 3 is similar to that of Example 2, but the wear rate is significantly higher. These results indicate that HA, as a high-performance polymeric water lubricant, imparts hydration capacity to the material through ionization of its carboxyl groups, thereby significantly reducing the friction coefficient and wear rate of the composite material. However, the weak interfacial bonding between the functional filler and the matrix makes it easy for the functional filler to peel off from the surface during friction, thus increasing the wear rate of the composite material. Therefore, to further enhance the interfacial bonding strength between the functional filler and the matrix and ensure the long-term reliability of the lubricating film, an adhesive PDA layer was introduced. The catechol structure of PDA can improve the interfacial adhesion strength and maintain the integrity of the lubricating film. Therefore, with the same filler content, Example 2 has a similar average coefficient of friction to Comparative Example 3, but a significantly lower wear rate. In summary, the DMSN-PEI-HA-PDA NPs functional filler, consisting of DMSN NPs as the core and a surface sequentially coated with a PEI, HA, and PDA three-network hydrogel layer, exhibits the best friction reduction, wear resistance, vibration reduction, and noise reduction effects.

[0040] The tribological properties and vibration noise characteristics of the TPU-based composite material samples prepared in Comparative Example 1 and Examples 1-5 are shown in the figure. Figure 3-5 As shown. Among them, Figure 3 The friction coefficient of the TPU-based composite materials prepared in Comparative Example 1 and Examples 1-5 for water-lubricated friction pairs under water lubrication conditions is shown as a function of time. Figure 4 The average coefficient of friction of the TPU-based composite materials for water-lubricated friction pairs prepared in Comparative Example 1 and Examples 1-5 under water lubrication conditions is shown. Figure 5 The wear rates of the TPU-based composite materials for water-lubricated friction pairs prepared in Comparative Example 1 and Examples 1-5 are shown under water-lubricated conditions. Figure 3 As shown, with the gradual increase of DMSN-PEI-HA-PDA NPs content, the friction coefficient of the composite material shows a trend of first decreasing and then increasing. Figure 4As shown, the average friction coefficient of the composite material was lowest when the DMSN-PEI-HA-PDA NPs content was 1.5 wt%, a reduction of 64.2%. The morphology of the wear tracks was collected using a laser confocal 3D topology analyzer, and the wear rate of the composite material was calculated. Figure 5 As shown, the wear rate of the composite material first decreases and then increases with the gradual increase of the DMSN-PEI-HA-PDA NPs content, which is the same as the trend of the friction coefficient. The wear rate of the composite material is the lowest when the DMSN-PEI-HA-PDA NPs content is 1.5 wt%, a reduction of 55%.

[0041] Figure 6 The image shows a SEM image of the worn surface of the TPU-based composite material for water-lubricated friction pairs prepared in Example 3 under water lubrication conditions. Figure 6 As shown, during the friction process, DMSN-PEI-HA-PDA NPs induce the formation of micro-protrusion structures on the wear surface of the composite material. The encapsulated PEI-HA-PDA gel layer absorbs water and swells, forming a hydrated lubricating film with a certain strength on the micro-protrusion surface. The TPU-based low-friction and vibration-damping composite material prepared by this invention, suitable for water-lubricated conditions, exhibits superior friction-reducing and wear-resistant properties under water-lubricated conditions when the content of DMSN-PEI-HA-PDA NPs filler and TPU raw material is within the range of 1~2 wt.% of the total weight percentage.

[0042] The vibration and noise performance of Comparative Example 1 and Example 3, which has the best tribological properties, during the stable friction process are shown in Table 2.

[0043] Table 2

[0044] Figure 7 The frictional vibration signals of the TPU-based composite materials for water-lubricated friction pairs prepared in Comparative Example 1 and Example 3 under water-lubricated conditions are shown. Figure 8 The noise signals of the TPU-based composite materials for water-lubricated friction pairs prepared in Comparative Example 1 and Example 3 under water lubrication conditions are shown. Figure 7-8As shown in Table 2, compared with the pure TPU sample of Comparative Example 1 and the composite material sample of Example 3, the vibration signal fluctuation range of the pure TPU material is larger, with a root mean square (RMS) value of 0.4371. This corresponds to its higher coefficient of friction and severe deformation of the worn surface. This further illustrates that the TPU material is insufficiently lubricated in an aqueous environment, and the stick-slip phenomenon on the contact surface generates a high frictional excitation force, thus producing strong vibration behavior during the friction process. In contrast, when the DMSN-PEI-HA-PDA NPs content is 1.5 wt%, the vibration signal of the composite material is significantly reduced, with an RMS value of 0.074 (a reduction of approximately 83.07%), which corresponds to its lower coefficient of friction and slight surface deformation. The RMS value of the sound pressure of pure TPU material is about 0.0319, corresponding to a sound pressure level of 64.04 dB. When the DMSN-PEI-HA-PDA NPs content is 1.5wt%, the RMS value of the sound pressure of the composite material is about 0.0241 (a decrease of about 24.45%), corresponding to a sound pressure level of 61.62 dB.

[0045] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. A low-friction, vibration-damping polyurethane composite material, characterized in that... It comprises a thermoplastic polyurethane matrix and DMSN-PEI-HA-PDA NPs functional fillers dispersed in the matrix; The DMSN-PEI-HA-PDA NPs functional filler consists of a three-network hydrogel layer formed by dendritic mesoporous silica nanoparticles DMSN NPs as the core and PEI, HA and PDA sequentially coated on the surface. The DMSN-PEI-HA-PDA NPs functional filler has a mass fraction of 0.5-2.5% in the polyurethane composite material.

2. The low-friction vibration-damping polyurethane composite material as described in claim 1, characterized in that... The mass fraction of the DMSN-PEI-HA-PDA NPs functional filler in the polyurethane composite material is 1.0-2.0%.

3. The low-friction vibration-damping polyurethane composite material as described in claim 1, characterized in that... The DMSN NPs consist of monodispersed spherical particles with an average particle size of 200-300 nm, exhibiting a central core-radial pore structure, with a BET surface area and cumulative pore volume of 350-450 m 2 g -1 and 1.5-2.5 cm 3 g -1 with an average pore size of 15-25 nm.

4. The low-friction vibration-damping polyurethane composite material as described in claim 1, characterized in that... The preparation method of the DMSN-PEI-HA-PDA NPs functional filler includes the following steps: (1) Disperse DMSN NPs in phosphate buffer solution, add PEI and stir to react, and centrifuge to obtain PEI-modified DMSN NPs; (2) Disperse the product of step (1) in deionized water, add HA solution to react, and centrifuge to remove free HA; (3) Disperse the product of step (2) in deionized water, add 1,4-butanediol diglycidyl ether, dopamine hydrochloride and sodium hydroxide to react and form PDA on the surface. After neutralization and washing, DMSN-PEI-HA-PDA NPs functional filler is obtained.

5. The low-friction vibration-damping polyurethane composite material as described in claim 4, characterized in that... In step (1), the mass ratio of PEI to DMSN NPs is (0.6-0.8):1, the reaction temperature is 20-30℃, and the reaction time is 2-4h.

6. The low-friction vibration-damping polyurethane composite material as described in claim 4, characterized in that... In step (3), the amount of dopamine hydrochloride added is 0.55-1 mg / mL, the amount of 1,4-butanediol diglycidyl ether added is 0.005-0.01 mg / mL, and the amount of sodium hydroxide added is 5-8 mg / mL; the reaction temperature is 40-50℃, and the reaction time is 10-14h.

7. The method for preparing the low-friction vibration-damping polyurethane composite material according to any one of claims 1-6, characterized in that... Includes the following steps: The dried TPU granules are melt-blended with DMSN-PEI-HA-PDA NPs functional fillers, crushed, and then injection molded.

8. The method for preparing the low-friction vibration-damping polyurethane composite material as described in claim 7, characterized in that... Melt blending is carried out in a micro internal mixer at a mixing temperature of 180-200℃; injection molding temperature is 170-190℃ and injection pressure is 120-130MPa.

9. The application of the low-friction vibration-damping polyurethane composite material according to any one of claims 1-6 in water-lubricated friction-reducing and noise-reducing components.

10. The application of the low-friction, vibration-damping polyurethane composite material as described in claim 9 in water-lubricated friction-reducing and noise-reducing components, characterized in that... The water-lubricated friction-reducing and noise-reducing components include any one of the following: a ship's water-lubricated stern bearing, a water pump bearing, and a guide rail slider.

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