Modified fiber cloth interface reinforced composite material of water-lubricated bearing and preparation method thereof

Abstract

The application relates to a modified fiber cloth interface reinforced composite material of a water-lubricated bearing and a preparation method thereof, which comprises a modified fiber cloth material and a water-lubricated bearing polymer matrix formed by impregnating the modified fiber cloth material with a prepolymer and solidifying; the modified fiber cloth material is arranged on one side of the water-lubricated bearing polymer matrix close to a friction interface. The modified fiber cloth material with self-lubricating and wear-resistant properties is introduced into the interface of the water-lubricated bearing polymer matrix material, the preparation is simple, stress is transmitted in multiple directions through the fibers at the interface, the shear force of the friction interface is effectively reduced and uniformly distributed, the conduction of the contact stress in the base material is promoted, the friction stability and surface wear morphology of the water-lubricated bearing material are improved, the wear and failure risk of the bearing is reduced, the durability and service life of the bearing material are prolonged, and the application is especially suitable for a water-lubricated bearing of a ship.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of bearing materials, and particularly relates to a modified fiber cloth interface reinforced composite material of a water-lubricated bearing and a preparation method thereof. BACKGROUND

[0002] The ocean is not only the cradle of life, but also a treasure house of resources, containing rich fishery resources and mineral resources, and is an important raw material base for future social material production. Among them, marine aquatic products account for about 85% of the world's aquatic products, and oil resources account for about 34% of the total global oil resources. As the carrier of national defense guarantee, marine resource development and ocean trade, ships have become the focus of industrial development. The tail bearing, as an important part of the ship propulsion system, is related to the safety of ship operation and has been widely concerned in the shipbuilding industry.

[0003] Water-lubricated bearings have good application prospects in the field of ship tail bearings due to their green, non-polluting, clean and sustainable advantages. However, the low viscosity and low load-bearing characteristics of water make the lubricating film formed by water-lubricated bearings under low-speed and heavy-load conditions less complete, and cannot achieve effective lubrication. In addition, the commonly used water-lubricated bearing material is a polymer composite material, and the self-lubricating property and wear resistance of the single-structure polymer composite material are poor, which can easily cause adhesive wear, abrasive wear and fatigue wear during friction, resulting in a large amount of surface material removal and thus causing bearing failure. These problems result in poor stability and short service life of water-lubricated bearings under harsh conditions, which seriously limits their promotion on ships. Therefore, improving the self-lubricating property and durability of water-lubricated bearing materials has become a necessary measure to bridge the gap between theoretical research achievements and engineering applications. SUMMARY

[0004] The purpose of the present application is to overcome the above technical deficiencies, and to provide a modified fiber cloth interface reinforced composite material of a water-lubricated bearing and a preparation method thereof, which solves the technical problem of poor self-lubricating property and durability of water-lubricated bearings in the prior art.

[0005] To achieve the above technical purpose, the technical solution provided by the present application is as follows:

[0006] In a first aspect, the present application provides a modified fiber cloth interface reinforced composite material of a water-lubricated bearing, which comprises a modified fiber cloth material and a water-lubricated bearing polymer matrix formed by impregnating a prepolymer into the modified fiber cloth material and solidifying; the modified fiber cloth material is arranged on the side of the water-lubricated bearing polymer matrix close to the friction interface.

[0007] Secondly, the present invention provides a method for preparing a modified fiber cloth interface-reinforced composite material for water-lubricated bearings, comprising the following steps: melting a polymer matrix prepolymer for water-lubricated bearings and mixing it with a chain extender to obtain a liquid mixture; placing a modified fiber cloth material in a mold; pouring the liquid mixture into the mold to combine with the modified fiber cloth material; cooling and demolding; and then heating and curing to obtain a modified fiber cloth interface-reinforced composite material for water-lubricated bearings.

[0008] Compared with the prior art, the beneficial effects of the present invention include:

[0009] This invention abandons the isotropic structure and performance of traditional water-lubricated bearing materials, proposing a modified fiber cloth interface-reinforced composite material and its preparation method suitable for marine water-lubricated bearings. This material uses a water-lubricated bearing polymer as the matrix, a chain extender as the polymer modifier, and a modified fiber cloth as the filler. By introducing a self-lubricating and wear-resistant modified fiber cloth into the interface of the water-lubricated bearing polymer matrix, this invention is simple to manufacture and significantly improves performance, solving the problem of poor stability and durability of water-lubricated bearing polymer materials under operating conditions. This invention improves the self-lubricating and wear-resistant properties of the water-lubricated bearing polymer interface. Through the fibers at the interface, multi-directional stress transmission is achieved, effectively reducing and uniformly distributing the shear force at the friction interface. This promotes the transmission of contact stress in the substrate, improves the frictional stability and surface wear morphology of the water-lubricated bearing material, reduces the risk of bearing wear and failure, and extends the durability and service life of the bearing material, making it particularly suitable for marine water-lubricated bearings. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the preparation process of the modified fiber cloth interface reinforced composite material for the water-lubricated bearing of the present invention.

[0011] Figure 2 This is a schematic diagram of the modified fiber cloth interface reinforced composite material for the water-lubricated bearing of the present invention.

[0012] Figure 3 The real-time friction coefficient (a) and wear morphology (b) of a water-lubricated bearing modified fiber cloth interface reinforced composite material sample filled with polytetrafluoroethylene and ultra-high molecular weight polyethylene modified fiber cloth are shown under the experimental conditions of 0.5 MPa load, 100 rpm rotation speed and dry friction.

[0013] Figure 4 The real-time friction coefficient (a) of a water-lubricated bearing modified fiber cloth interface reinforced composite material sample filled with polytetrafluoroethylene modified fiber cloth material and the wear morphology of bronze friction pair surface under dry friction are shown in the experimental conditions of 0.8 MPa load, 100 rpm rotation speed and water lubrication.

[0014] Figure 5 Comparison of shear force simulation test results under dry friction conditions for modified fiber cloth interface reinforced composite material and pure polymer material samples; where (a) is the mechanical simulation diagram of pure polyurethane (PU) material; (b) is the mechanical simulation diagram of modified ultra-high molecular weight polyethylene (UHMWPE) fiber cloth interface reinforced composite material. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0016] Tribology is closely related to interface science. During friction, friction, wear, and lubrication directly act on the contact interface between two objects. The interfacial friction, interfacial wear, and interfacial lubrication between friction pairs directly determine the tribological properties of the material. High-strength fiber fabrics can effectively improve the mechanical properties of polymers and are widely used in the development of new materials in aerospace and construction fields. Furthermore, some fiber fabrics not only possess good mechanical properties but also excellent self-lubricating properties. However, how to introduce high-strength, self-lubricating fiber fabrics into the interface of polymer composite materials to improve the tribological properties of polymer composites for water-lubricated bearings remains a challenge in solving the friction problems of water-lubricated bearing materials.

[0017] This invention provides a modified fiber cloth interface-reinforced composite material for marine water-lubricated bearings and its preparation method. The method involves weaving and modifying a high-strength, highly self-lubricating material into a fiber fabric, which is then combined with the molding process of a water-lubricated bearing polymer material to prepare a novel modified fiber cloth interface-reinforced composite material for marine water-lubricated bearings. This improves the self-lubricating and wear-resistant properties of the water-lubricated bearing polymer material interface, promotes the transmission of contact stress in the substrate, improves the frictional stability and surface wear morphology of the water-lubricated bearing material, reduces bearing wear and failure risk, extends the durability of the bearing material, and promotes the engineering application of water-lubricated bearing polymer materials.

[0018] Based on this, the invention was created, which has great practical significance for promoting the engineering application of water-lubricated bearing materials, especially for marine water-lubricated bearings.

[0019] To better understand this invention, the casting mold is placed horizontally and sheet-like composite material is used as a reference. This is only to more clearly describe the relative positional relationship between the modified fiber cloth material and the water-lubricated bearing polymer matrix in this invention, and not to limit the invention.

[0020] The present invention discloses a modified fiber cloth interface reinforced composite material for water-lubricated bearings, comprising a modified fiber cloth material and a water-lubricated bearing polymer matrix formed by impregnating the modified fiber cloth material with a prepolymer and curing it; the modified fiber cloth material is disposed in the water-lubricated bearing polymer matrix on the side near the friction interface.

[0021] The polymer matrix material of the water-lubricated bearing is a commercially available raw material with stable chemical properties and is non-toxic and pollution-free.

[0022] Preferably, the thickness of the composite material is more than twice the thickness of the modified fiber cloth material. The thickness of both is moderate, ensuring that they can fully play a role in lubrication and shock absorption. At the same time, the modified fiber cloth material effectively protects the polymer matrix of the water-lubricated bearing and avoids shear force concentration.

[0023] The total thickness of the polymer matrix for the water-lubricated bearing and the thickness of the modified fiber cloth material can be selected according to the actual application scenario. For example, the total thickness of the composite material is 0.2-20 mm, and the thickness of the modified fiber cloth material is 0.05-0.2 mm. More preferably, the total thickness of the polymer matrix for the water-lubricated bearing is 8-12 mm, and the thickness of the modified fiber cloth material is 0.1-0.15 mm. For example, the total thickness of the polymer matrix for the water-lubricated bearing is 10 mm, and the thickness of the modified fiber cloth material is 0.12 mm.

[0024] The friction interface is the contact surface of the friction pair during the friction process. To more clearly describe the invention, the front side (the side at the friction interface during operation) and the back side (the side away from the friction interface during operation) of the modified fiber cloth material are defined accordingly. The invention uses casting molding to attach a thin layer of polymer to the front side of the modified fiber cloth material near the friction interface. During actual use, the thin layer of polymer falls off under friction, exposing the modified fiber cloth material. At the same time, the sides and back side of the modified fiber cloth material remain firmly bonded to the polymer matrix of the water-lubricated bearing, effectively protecting the matrix. It also utilizes its own flexible fiber network to achieve multi-directional shear force transmission, avoiding shear force concentration, and enabling the matrix to effectively perform self-lubrication and other functions.

[0025] It is understood that the composite material of the present invention can be a sheet structure, which can be placed in the bearing when in use; or it can be cast as a whole with the polymer water-lubricated bearing, which is one of the advantages of casting molding in the present invention. In this case, the modified fiber cloth material and the polymer matrix of the water-lubricated bearing are arranged coaxially, and the total thickness of the polymer matrix of the water-lubricated bearing can be relatively small, for example, less than 1 mm.

[0026] Preferably, the polymer matrix material of the water-lubricated bearing is any one of polyurethane, polyetheretherketone, and nylon.

[0027] Preferably, the modified fiber cloth material is obtained by surface chemical inert modification of a fiber cloth material with excellent self-lubricating and wear-resistant properties.

[0028] More preferably, the fiber cloth material is any one of ultra-high molecular weight polyethylene (molecular weight above 1 million), polytetrafluoroethylene, lubricating modified resin, etc.

[0029] Preferably, the modified fiber cloth material is arranged horizontally at the friction interface close to the polymer matrix of the water-lubricated bearing.

[0030] More preferably, the surface chemical inert modification is plasma treatment.

[0031] See Figure 1 The present invention also provides a method for preparing the modified fiber cloth interface reinforced composite material of the above-mentioned water-lubricated bearing, comprising the following steps:

[0032] Step 1: The self-lubricating wear-resistant fiber cloth material is subjected to plasma treatment to obtain modified fiber cloth material;

[0033] Step 2: Add the modifier to the molten polymer matrix material to obtain a modified mixture;

[0034] Step 3: The modified mixture obtained in Step 2 is combined with the modified fiber cloth material in Step 1 by casting. After demolding and curing, the modified fiber cloth interface reinforced composite material for water-lubricated bearings is obtained.

[0035] like Figure 2 As shown, the water-lubricated bearing modified fiber cloth interface reinforced composite material prepared by the present invention is composed of polymer matrix material 1 and modified fiber cloth material 2, with the modified fiber cloth material 2 filling the interior of polymer matrix material 1.

[0036] Preferably, in step 1, the modified fiber cloth material is a self-lubricating wear-resistant fiber cloth material whose surface chemical inertness is altered by plasma. The plasma treatment atmosphere is air, oxygen, argon, nitrogen, etc., the treatment power is between tens and hundreds of watts, and the treatment time is between a few seconds and tens of minutes. Specific conditions can be selected according to the material being treated and the requirements. For example, the treatment power is between 10W and 800W, the treatment time is between 6s and 50min, and the treatment pressure is between 0.1 and 1.0mbar to ensure that the degree of erosion on the material surface is appropriate.

[0037] Preferably, in step 2, the modifier is a chain extender of various types that improve the mechanical and processing properties of the matrix material. The specific type is selected according to the type of matrix polymer material. Typical chain extenders for polyurethane include 3,3'-dichloro-4,4'-diaminophenylmethane (MOCA), diethyltoluenediamine (DETDA), and 4,4'-methylenebis(3-chloro-2,6-diethylaniline) (MCDEA). Typical chain extenders for polyetheretherketone include 4,4'-difluorophenol ketone and p-hydroxybenzoic acid. Typical chain extenders for nylon include adipic acid, hexanediol, bisoxazoline, diisocyanate, and terephthalate.

[0038] The type and amount of chain extender can be selected according to the polymer prepolymer; preferably, the chain extension coefficient of the chain extender is 0.85 to 1.05; the mass ratio of polymer prepolymer to chain extender is 100:(10 to 30), and more preferably 100:(18 to 22).

[0039] Preferably, in step 3, the preparation of a qualified molded product is based on the horizontal arrangement of the modified fiber cloth material at the interface of the composite material and its effective bonding with the matrix.

[0040] The main principle of this invention is:

[0041] This invention modifies a self-lubricating wear-resistant fiber cloth material through plasma treatment, and then arranges the modified fiber cloth material at the bottom of a mold. A water-lubricated bearing polymer material is melted and mixed with a modifier, then poured into the mold to combine with the modified fiber cloth. After the mixture is demolded and cured, a water-lubricated bearing modified fiber cloth interface-reinforced composite material is obtained. The excellent self-lubricating and wear-resistant properties of the modified fiber cloth material at the interface protect the friction surface of the novel water-lubricated bearing modified fiber cloth interface-reinforced composite material, reducing surface scratches and fatigue wear, improving the surface wear morphology of the shaft and bearing materials, transmitting stress through the fiber network, reducing the shear force on the matrix, and simultaneously playing a vibration damping role, thereby effectively improving the tribological properties of the water-lubricated bearing material.

[0042] The present invention will be further described in detail below through specific embodiments.

[0043] Example 1

[0044] Ultra-high molecular weight polyethylene (UHMWPE) self-lubricating wear-resistant fiber cloth material was subjected to plasma treatment at 20W power for 5 minutes in a PDC-002 plasma cleaner (Harrick, USA) to obtain modified fiber cloth material. The modified fiber cloth material was then arranged at the bottom of a mold. Toluene-2,4-diisocyanate (TDI) and 10wt% palm wax were mixed and heated to 90℃ to obtain polyurethane (PU) prepolymer after reaction. The polyurethane (PU) prepolymer was mixed with chain extender 4,4'-methylenebis(3-chloro-2,6-diethylaniline) at a ratio of 100:19.4. The mixture was poured into the mold and combined with the modified fiber cloth filler. After natural cooling, the mixture was demolded and placed in a 90℃ oven for 8 hours to cure, resulting in a water-lubricated bearing modified UHMWPE fiber cloth interface reinforced composite material.

[0045] Example 2

[0046] Example 2 differs from Example 1 only in that the type of fiber cloth material is adjusted; the other steps and conditions are the same as in Example 1. The specific steps are as follows:

[0047] A modified PTFE self-lubricating wear-resistant fiber cloth material was obtained by plasma treatment. The modified PTFE fiber cloth material was then arranged at the bottom of a mold. Toluene-2,4-diisocyanate (TDI) and 10 wt% palm wax were mixed and heated to 90°C to obtain a polyurethane (PU) prepolymer after reaction. The polyurethane (PU) prepolymer was mixed with the chain extender 4,4'-methylenebis(3-chloro-2,6-diethylaniline) at a ratio of 100:19.4. The mixture was poured into the mold and combined with the modified PTFE fiber cloth filler. After natural cooling, the mixture was demolded and placed in an oven at 90°C for 8 hours to cure, resulting in a water-lubricated bearing modified PTFE fiber cloth interface reinforced composite material.

[0048] Comparative Example 1

[0049] Comparative Example 1 differs from Example 1 only in that no modified fiber cloth material is added; all other steps and conditions are the same as in Example 1. The specific steps are as follows:

[0050] Polyurethane prepolymer and chain extender 4,4'-methylenebis(3-chloro-2,6-diethylaniline) were mixed in a ratio of 100:19.4. The mixture was poured into a mold by casting, and after natural cooling, it was demolded. The demolded mixture was placed in an oven at 90°C for 8 hours to cure, thus obtaining a water-lubricated bearing modified fiber cloth interface reinforced composite material.

[0051] Performance testing

[0052] Friction and Wear Performance Test 1: The modified ultra-high molecular weight polyethylene fiber cloth filled water-lubricated bearing modified fiber cloth interface-reinforced composite material prepared in Example 1 and the polyurethane material of Comparative Example 1 were used as test specimens, and bronze material was used as the friction pair material. Surface polishing was performed. Friction tests were conducted on a friction and wear testing machine at room temperature. The coefficient of friction and wear morphology were measured. The test was conducted for 2 hours under dry friction, a load of 0.5 MPa, and a rotational speed of 100 rpm. The test results are as follows: Figure 3 As shown.

[0053] Friction and Wear Performance Test 2: The modified polytetrafluoroethylene fiber cloth-filled water-lubricated bearing modified fiber cloth interface-reinforced composite material prepared in Example 2 and the polyurethane material of Comparative Example 1 were used as test specimens, and bronze material was used as the friction pair material. Surface polishing was performed. Friction tests were conducted on a friction and wear testing machine at room temperature. The coefficient of friction and wear morphology were measured. The test was conducted for 2 hours under dry friction / water lubrication, a load of 0.8 MPa, and a rotational speed of 100 rpm. The test results are as follows: Figure 4 As shown.

[0054] Mechanical simulation experiment: Using Texgen software, the modified UHMWPE fiber cloth interface reinforced composite material and pure PU material were modeled to obtain the simulation model of the modified UHMWPE fiber cloth interface reinforced composite material in simulation example 1 and the simulation model of the pure PU material in simulation comparison example 1.

[0055] In simulation example 1, the diameter of the UHMWPE fibers is 0.12 mm and the distance between the fibers and the surface is 0.32 mm.

[0056] Simulation Comparison Example 1: Simulation model of pure PU material.

[0057] Mesh generation was performed on Simulation Example 1, Simulation Comparative Example 1, and the copper disk model. Simulation Example 1 and Simulation Comparative Example 1 were assembled with the copper disk model with zero gap. The load was set to 0.5 MPa. The simulation specimen was fixed, and the copper disk model was slid 1 mm along the x-axis. Mechanical simulation experiments were conducted using Abaqus software, and the experimental results are as follows: Figure 5 As shown.

[0058] The technical solutions of the present invention will be clearly and completely described below with reference to the experimental results in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and the invention is only for a modified fiber cloth interface reinforced composite material suitable for water-lubricated bearings, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present invention.

[0059] Experimental results:

[0060] like Figure 3 As shown, compared to the isotropic water-lubricated bearing polyurethane (PU) material shown in Comparative Example 1, the water-lubricated bearing modified fiber cloth interface-reinforced composite material filled with ultra-high molecular weight polyethylene and polytetrafluoroethylene modified fiber cloth (PU+UHMWPE obtained in Example 1 and PU+PTFE obtained in Example 2) of the present invention effectively improves the frictional stability of the shaft and bearing friction pair under dry friction conditions (as shown in Figure a, the friction coefficient of pure PU material in Comparative Example 1 fluctuates significantly with time compared to Example 1 and Example 2 of the present invention), and improves the wear morphology of the bearing material friction interface (as shown in Figure b, the surface wear Sa of pure PU material in Comparative Example 1 as the water-lubricated bearing interface material is 0.489 μm, which is significantly higher than 0.258 μm in Example 1 and 0.289 μm in Example 2). The ultra-high molecular weight polyethylene and polytetrafluoroethylene modified fiber cloth material introduced into the bearing interface can realize the multi-directional transmission of shear force in the substrate, avoid stress concentration, effectively enhance the shear resistance of the bearing substrate, and help reduce fatigue wear caused by cyclic shear stress. Furthermore, ultra-high molecular weight polyethylene (UHMWPE) and polytetrafluoroethylene (PTFE) materials possess good self-lubricating properties, low friction, and wear resistance. Under dry friction conditions, the UHMWPE and PTFE-modified fiber cloth materials at the interface can act as interfacial lubricants, improving the frictional stability between the friction pairs. Experimental results demonstrate that the modified fiber cloth interface-reinforced composite material for water-lubricated bearings effectively improves the frictional performance of water-lubricated bearings under dry friction conditions.

[0061] like Figure 4 As shown, compared to the isotropic water-lubricated bearing polyurethane material shown in Comparative Example 1, the water-lubricated bearing modified fiber cloth interface-reinforced composite material filled with polytetrafluoroethylene modified fiber cloth obtained in Example 2 of this invention effectively improves the frictional stability of the shaft and bearing friction pair under dry friction / water lubrication and heavy load conditions. Figure 4 As shown in (a), the wear morphology of the friction interface was improved. Figure 4(As shown in (b)). Under heavy load conditions, the lubricating water film cannot spread completely and stably on the bearing surface. However, the PTFE-modified fiber cloth material at the bearing interface, which has self-lubricating, low-friction, and wear-resistant properties, can play a role in interfacial lubrication, improving the frictional stability between the friction pairs. The PTFE-modified fiber cloth material introduced into the bearing interface can realize the multi-directional transmission of shear force in the substrate, avoid stress concentration, effectively enhance the shear resistance of the bearing substrate, and help reduce fatigue wear caused by cyclic shear stress. Under dry friction and heavy load conditions, the shaft and bearing material surfaces are in direct contact. Therefore, the reduction of fatigue wear of the water-lubricated bearing material is beneficial to reducing the generation of wear debris, thereby improving the wear morphology of the shaft surface. Experimental results prove that the water-lubricated bearing modified fiber cloth interface-reinforced composite material obtained in this invention effectively improves the frictional performance of water-lubricated bearings under heavy load conditions.

[0062] like Figure 5 As shown in Figure (a), the shear force at the friction interface of pure PU material exhibits periodic concentration, while in Figure (b), the shear force at the friction interface of the modified UHMWPE fiber-reinforced composite material does not concentrate. Instead, it is transmitted multidirectionally through the fibers at the interface, thus effectively reducing and uniformly distributing the shear force at the friction interface. Compared with pure PU material, the introduction of modified UHMWPE fiber cloth at the interface ensures excellent bonding performance between the fiber cloth and the matrix while achieving multidirectional transmission of shear force in the substrate, avoiding stress concentration at the interface, effectively enhancing the shear resistance of the bearing substrate, helping to reduce fatigue wear caused by cyclic shear stress, and effectively reducing frictional vibration caused by periodic shear force, thereby improving the frictional stability of water-lubricated bearings. Experimental results demonstrate that the modified fiber cloth interface-reinforced composite material effectively improves the wear resistance and frictional stability of water-lubricated bearings.

[0063] This demonstrates that the modified fiber cloth interface-reinforced composite material for water-lubricated bearings of the present invention can significantly improve the self-lubricating performance and wear resistance of water-lubricated bearings, promote the transmission of contact stress in the substrate, improve the frictional stability and surface wear morphology of water-lubricated bearings, reduce the risk of bearing wear and failure, improve the durability of bearings, and enhance the feasibility of engineering applications of polymer materials for water-lubricated bearings.

[0064] Compared with existing technologies, this invention discloses a modified fiber cloth interface-reinforced composite material for water-lubricated bearings and its preparation method. The modified fiber cloth interface-reinforced composite material for water-lubricated bearings is made by mixing a polymer matrix material, a modifier, and a modified fiber cloth material. The modified fiber cloth material is arranged at the bottom of a mold, and the polymer matrix mixture treated with the modifier is bonded to it by a casting method to obtain the novel modified fiber cloth interface-reinforced composite material for water-lubricated bearings. The excellent self-lubricating and wear-resistant properties of the modified fiber cloth material at the interface protect the friction surface of the novel modified fiber cloth interface-reinforced composite material for water-lubricated bearings, reducing surface scratches and fatigue wear, improving the surface wear morphology of shaft and bearing materials, transmitting stress through the fiber network, reducing the shear force on the matrix, and simultaneously playing a vibration damping role, thereby effectively improving the tribological properties of the water-lubricated bearing material. This invention utilizes the excellent self-lubricating and wear-resistant properties of the self-lubricating and wear-resistant fiber cloth material to improve the stability and wear resistance of marine water-lubricated bearings under operating conditions, extend the service life of polymer bearing materials, and enhance the feasibility of engineering applications of water-lubricated bearing composite materials.

[0065] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A modified fiber cloth interface-reinforced composite material for water-lubricated bearings, characterized in that, The composite material includes a modified fiber cloth material and a water-lubricated bearing polymer matrix formed by impregnating the modified fiber cloth material with a prepolymer and curing it. The modified fiber cloth material is disposed in the polymer matrix of the water-lubricated bearing on the side near the friction interface; The polymer matrix of the water-lubricated bearing is polyurethane, polyetheretherketone, or nylon.

2. The modified fiber cloth interface-reinforced composite material for water-lubricated bearings according to claim 1, characterized in that, The modified fiber cloth material is obtained by surface chemical inert modification of the fiber cloth material.

3. The modified fiber cloth interface-reinforced composite material for water-lubricated bearings according to claim 2, characterized in that, The fiber cloth material is ultra-high molecular weight polyethylene or polytetrafluoroethylene.

4. The modified fiber cloth interface-reinforced composite material for water-lubricated bearings according to claim 2, characterized in that, Surface chemical inert modification is achieved through plasma treatment.

5. The modified fiber cloth interface-reinforced composite material for water-lubricated bearings according to claim 1, characterized in that, The modified fiber cloth material is disposed on the friction interface side near the polymer matrix of the water-lubricated bearing.

6. The method for preparing the modified fiber cloth interface-reinforced composite material for water-lubricated bearings as described in any one of claims 1-5, characterized in that, Includes the following steps: The water-lubricated bearing polymer matrix prepolymer was melted and mixed with a chain extender to obtain a liquid mixture; The modified fiber cloth material is placed in a mold, and the liquid mixture is poured into the mold to combine with the modified fiber cloth material. After cooling and demolding, it is heated and cured to obtain a modified fiber cloth interface reinforced composite material for water-lubricated bearings.

7. The method for preparing the modified fiber cloth interface-reinforced composite material for water-lubricated bearings according to claim 6, characterized in that, Modified fiber cloth material is obtained by plasma treatment of fiber cloth material; in plasma treatment, the treatment atmosphere is air, oxygen, argon or nitrogen.

8. The method for preparing the modified fiber cloth interface-reinforced composite material for water-lubricated bearings according to claim 6, characterized in that, Chain extenders include 3,3'-dichloro-4,4'-diaminophenylmethane, diethyltoluenediamine, 4,4'-methylenebis(3-chloro-2,6-diethylaniline), 4,4'-difluorophenolone, p-hydroxybenzoic acid, adipic acid, hexanediol, bisoxazoline, diisocyanate, or terephthalate.

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