Wear-resistant material for sealing high-speed rotating parts and preparation method thereof

Abstract

The present invention discloses a wear-resistant material for sealing high-speed rotating parts and a preparation method thereof. The wear-resistant material is applied to the friction working area between the rotating part and the stationary part. The wear-resistant material comprises the following components by weight: 40-60 parts of silicon carbide, 10-30 parts of hydroxylated modified polyetheretherketone, 3-10 parts of composite fiber, 5-15 parts of magnesium silicate lithium sol, and 1-2 parts of silane coupling agent. The wear-resistant material can be applied to media such as sewage and chemical waste liquid with high impact pressure, and the surface is not prone to cracking and has excellent wear resistance, which helps to maintain the service life of high-speed rotating parts.

Description

Technical Field

[0001] The present invention relates to the technical field of wear-resistant materials, and in particular to a wear-resistant material for sealing high-speed rotating parts and a preparation method thereof. Background Art

[0002] In mechanical equipment, when the rotating parts of a rotating machine come into contact with the stationary parts, radial friction or axial collision and wear between the moving and static parts will occur. In severe cases, the entire machine will be damaged. Therefore, it is necessary to set wear-resistant materials between the rotating parts and the stationary parts to meet the wear resistance requirements.

[0003] In the prior art, ceramic materials are commonly used in high-speed rotating parts. Ceramic materials include aluminum oxide, silicon nitride, and silicon carbide. They have advantages such as high hardness, high strength, wear resistance, and high temperature resistance, and are therefore widely used in high-speed rotating parts. A Chinese patent application with the authorization publication number CN102504204B discloses a wear-resistant material composited with an organic polymer and silicon carbide and a preparation method thereof. The material comprises two components, A and B. Component A mainly comprises 100 parts of epoxy resin, 2-3 parts of silane coupling agent, and 550-560 parts of silicon carbide; component B comprises 25 parts of carboxyl-terminated liquid rubber, 15-20 parts of an amine curing agent, 2-4 parts of an accelerator, and 140-150 parts of silicon carbide. Components A and B are mixed in a weight ratio of 4:1.

[0004] However, in the prior art, epoxy resin and silicon carbide are used to make wear-resistant materials. Epoxy resin has excellent adhesion, which helps to better process and shape it with silicon carbide. However, epoxy resin is brittle. When the wear-resistant material is applied to media such as sewage with high impact pressure, the surface of the above-mentioned wear-resistant material is prone to cracking and the wear resistance deteriorates, which is not conducive to maintaining a long service life of high-speed rotating parts. Summary of the Invention

[0005] Based on the above technical problems, the present application provides a wear-resistant material for sealing high-speed rotating parts and a preparation method thereof. When used in media such as sewage and chemical waste liquid with high impact pressure, it has excellent wear resistance and can maintain a long service life.

[0006] In the first aspect, the present application provides a technical solution that adopts the following:

[0007] A wear-resistant material for sealing high-speed rotating parts is used in the friction working area between rotating parts and stationary parts. The wear-resistant material includes the following components by weight: 40-60 parts of silicon carbide, 10-30 parts of hydroxylated modified polyetheretherketone, 3-10 parts of composite fiber, 5-15 parts of magnesium silicate lithium sol, and 1-2 parts of silane coupling agent.

[0008] By adopting the above technical scheme, hydroxylated modified polyetheretherketone and lithium magnesium silicate sol are added to the wear-resistant material system of silicon carbide. Polyetheretherketone, as an upgraded replacement material for epoxy resin, has excellent wear resistance, chemical corrosion resistance, peeling resistance and mechanical strength; lithium magnesium silicate has thickening, thixotropy and film-forming properties, and strong adsorption capacity. Its sol helps to increase the adhesion of polyetheretherketone, and can also form a film on the surface of rotating parts, while maintaining a low expansion rate and water absorption rate; at the same time, hydroxylation modification of polyetheretherketone helps to provide more active sites for the coupling introduction of lithium magnesium silicate molecules, thereby ensuring the full reaction of hydroxylated modified polyetheretherketone and lithium magnesium silicate sol, so that the prepared wear-resistant material can be used in media such as sewage and chemical waste liquid with high impact pressure, and the surface is not prone to cracking, has excellent wear resistance, and maintains a long service life of high-speed rotating parts.

[0009] Furthermore, the wear-resistant material comprises the following components in parts by weight: 45-55 parts of silicon carbide, 15-25 parts of hydroxylated modified polyetheretherketone, 5-8 parts of composite fiber, 8-12 parts of magnesium silicate lithium sol, and 1.2-1.8 parts of silane coupling agent.

[0010] By adopting the above technical solution, the addition amount of each component in the wear-resistant material is optimized, so that the mechanical properties and wear resistance of the wear-resistant material can be made better.

[0011] Furthermore, the particle size of the silicon carbide is 30-50 μm.

[0012] By adopting the above technical solution, it is helpful to evenly disperse silicon carbide in the reaction system, thereby realizing the preparation of wear-resistant materials with excellent wear resistance and mechanical properties. However, if the particle size of silicon carbide is too large, it is not easy to be evenly dispersed in the reaction system, and the density between silicon carbide particles is reduced, which will affect the wear resistance and mechanical properties of the wear-resistant material; if the particle size of silicon carbide is too small, agglomeration will occur, and the wear-resistant material cannot be guaranteed to have excellent wear resistance.

[0013] Furthermore, the degree of hydroxylation of the hydroxylated modified polyetheretherketone is 70%-85%.

[0014] By adopting the above technical scheme, the surface roughness of the hydroxylated modified polyetheretherketone is significantly increased, which helps to provide more active sites, thereby improving the reaction activity with the lithium magnesium silicate sol. In this scheme, the hydroxylation degree of the hydroxylated modified polyetheretherketone is 70%-85%, which helps to provide more active sites for the coupling introduction of lithium magnesium silicate molecules, thereby improving the binding activity with the lithium magnesium silicate sol. When the prepared wear-resistant material is used in media such as sewage and chemical waste liquid with high impact pressure, its surface is not prone to cracking and has excellent wear resistance.

[0015] Furthermore, the lithium magnesium silicate sol is prepared according to the following method:

[0016] Mix polyvinyl alcohol and deionized water, and heat to 90-95°C while stirring until the polyvinyl alcohol dissolves to form a polyvinyl alcohol aqueous solution with a mass concentration of 15%-20%;

[0017] Then, lithium magnesium silicate is added to deionized water and magnetically stirred for 30-45 minutes to obtain a lithium magnesium silicate aqueous dispersion with a mass concentration of 0.8%-1.2%;

[0018] Adding butyl diglycol acetate to the lithium magnesium silicate aqueous dispersion in an amount of 1-5% of the lithium magnesium silicate dispersion, stirring evenly, then slowly dripping the polyvinyl alcohol aqueous solution, stirring at 50-60° C. for 30-40 minutes to obtain a mixed solution;

[0019] The mixed solution was degassed in a vacuum degassing machine to obtain lithium magnesium silicate sol.

[0020] By adopting the above technical solution, the viscosity of the dispersion must be strictly controlled in the preparation of lithium magnesium silicate sol. When lithium magnesium silicate is dissolved in deionized water and when lithium magnesium silicate dissolved in deionized water is mixed with a polyvinyl alcohol aqueous solution, gelation of lithium magnesium silicate is easily produced due to hydrogen bonding. In this application, diethylene glycol butyl ether acetate is added, and the interaction between it and the lithium magnesium silicate molecules is greater than the interaction between polyvinyl alcohol and lithium magnesium silicate, which helps to reduce the physical cross-linking points of lithium magnesium silicate between polyvinyl alcohol molecular chains. Therefore, the addition of diethylene glycol butyl ether acetate can reduce the gelation of lithium magnesium silicate sol, thereby achieving stable preparation of lithium magnesium silicate sol; at the same time, diethylene glycol butyl ether acetate has excellent film-forming properties, which helps to further improve the wear resistance of the wear-resistant material.

[0021] Furthermore, the composite fiber is a mixture of carbon fiber and aramid fiber in a mass ratio of 1.8-2:1.

[0022] By adopting the above technical solution, carbon fiber can effectively reinforce polyetheretherketone, but the surface of carbon fiber is easily worn. Aramid fiber is compounded with carbon fiber. Since the molecular chain of aramid fiber is rigid and very dense, it can effectively prevent substances from passing through the fiber gaps, thereby compensating for the defect of easy wear of carbon fiber. The prepared composite fiber has excellent mechanical reinforcement, wear resistance, chemical corrosion resistance and good stress fatigue resistance.

[0023] Furthermore, the carbon fiber is a chopped carbon fiber with a length of 1-3 mm, and the aramid fiber is a chopped aramid fiber with a length of 100-200 μm.

[0024] By adopting the above technical solution, carbon fibers within the above length ratio range are compounded with aramid fibers, and the aramid fibers can fill the gaps in the carbon fibers. The two can produce a synergistic effect, which helps to improve the mechanical properties and wear resistance of the wear-resistant material.

[0025] In a second aspect, the present application provides a method for preparing a wear-resistant material for sealing high-speed rotating parts, which adopts the following technical solution:

[0026] A method for preparing a wear-resistant material for sealing high-speed rotating parts, comprising the following steps:

[0027] The composite fiber is placed in a lithium magnesium silicate sol and immersed at room temperature for 1-1.5 hours to obtain a lithium magnesium silicate sol impregnated with the fiber;

[0028] Heat and melt the hydroxylated modified polyetheretherketone, add the above-mentioned fiber-impregnated lithium magnesium silicate sol and silane coupling agent under stirring, and blend for 10-30 minutes;

[0029] Add silicon carbide, mix and stir for 30-45 minutes, extrude and granulate to obtain wear-resistant material.

[0030] By adopting the above technical solution, the composite fiber is not easy to be directly dispersed in polyetheretherketone, so the composite fiber is pre-impregnated in magnesium silicate lithium sol, and then the sol is added to the melt of hydroxylated modified polyetheretherketone and uniformly blended, which helps to improve the stability of the preparation process. At the same time, the prepared wear-resistant material is evenly dispersed and has good wear resistance and mechanical properties.

[0031] Furthermore, the composite fiber is placed before the magnesium silicate lithium sol, hydroxy silicone oil is evenly added to the surface of the composite fiber, and the composite fiber is sealed and stored for 12-24 hours.

[0032] By adopting the above technical solution, the surface of the composite fiber is infiltrated with hydroxyl silicone oil, which is beneficial to modifying the surface of the composite fiber with hydroxyl groups. There are a large number of hydroxyl groups in the magnesium silicate lithium sol, which is beneficial to the uniform dispersion of the composite fiber in the magnesium silicate lithium sol.

[0033] In a third aspect, the present application provides an application of a wear-resistant material for sealing high-speed rotating parts, using the following technical solution:

[0034] The invention discloses an application of a wear-resistant material for sealing a high-speed rotating part. The wear-resistant material can be used to process a seal between a high-speed rotating part and a stationary part.

[0035] In a possible implementation, the sealing member may be a sealing ring, a bearing ring, a bearing seat, etc.

[0036] In summary, this application has at least one of the following beneficial effects:

[0037] (1) In the present application, hydroxylated modified polyetheretherketone, magnesium silicate lithium sol and composite fiber are added to the wear-resistant material system of silicon carbide, so that the prepared wear-resistant material can be used in media such as sewage with high impact pressure, and the surface is not prone to cracking, has excellent wear resistance, and maintains a long service life of high-speed rotating parts;

[0038] (2) This application uses hydroxylated modified polyetheretherketone, the surface roughness of which is significantly increased, which helps to provide more active sites, thereby improving the binding activity with magnesium silicate lithium sol, so that when the prepared wear-resistant material is used in media such as sewage and chemical waste liquid with high impact pressure, its surface is not prone to cracking and has excellent wear resistance.

[0039] (3) The viscosity of the dispersion liquid must be strictly controlled in the preparation of lithium magnesium silicate sol in this application. When lithium magnesium silicate is dissolved in deionized water or when lithium magnesium silicate dissolved in deionized water is mixed with a polyvinyl alcohol aqueous solution, the lithium magnesium silicate is easily gelled due to hydrogen bonding. In this application, diethylene glycol butyl ether acetate is added. The interaction between diethylene glycol butyl ether acetate and lithium magnesium silicate molecules is greater than the interaction between polyvinyl alcohol and lithium magnesium silicate, which helps to reduce the physical cross-linking points of lithium magnesium silicate between polyvinyl alcohol molecular chains. Therefore, the addition of diethylene glycol butyl ether acetate can reduce the gelation of lithium magnesium silicate sol, thereby achieving stable preparation of lithium magnesium silicate sol; at the same time, diethylene glycol butyl ether acetate has excellent film-forming properties, which helps to further improve the wear resistance of wear-resistant materials. DETAILED DESCRIPTION

[0040] In order to make the invention objectives, technical solutions and beneficial technical effects of this application more clear, this application will be described in detail below. It should be noted that the various aspects, features, implementation methods and advantages described in this application can be compatible and / or can be combined together.

[0041] Unless otherwise specified, the meanings of the technical terms in this specification are the same as those generally understood by those skilled in the art.

[0042] The polyetheretherketone in the present application was purchased from Changchun Jida Special Plastic Engineering Research Co., Ltd., with an average particle size of 7 μm. Lithium magnesium silicate was purchased from Nanjing Haimings New Material Technology Co., Ltd., with an average particle size of 500 nm.

[0043] Preparation Example of Hydroxylated Polyetheretherketone

[0044] Preparation Example 1-3:

[0045] Weigh about 150 g of polyetheretherketone into a glass dish, place the glass dish in a vacuum drying oven, set the drying temperature to 80°C, and dry for 12 h;

[0046] Take a certain amount of dried polyetheretherketone, place it in a high-speed grinder for crushing, and then sieve the crushed polyetheretherketone with a 30-mesh sieve (pore size 0.6mm);

[0047] Measure 100 mL of dimethyl sulfoxide and place it in a 500 mL three-necked flask. Then weigh 4 g of crushed polyetheretherketone and pour it into the three-necked flask. Then weigh 0.8 g of sodium borohydride and transfer it to the three-necked flask.

[0048] Place the three-necked flask in an oil bath (dimethyl silicone oil) with half of the flask immersed in the oil bath. Set the oil bath temperature to 120°C and stir at 85 rpm for 6-10 hours.

[0049] After the reaction is completed, the temperature of the three-necked flask is cooled to room temperature, filtered with microporous filter paper, and washed with anhydrous ethanol, deionized water, and hydrochloric acid solution in sequence;

[0050] After the filtration is completed, the filtrate is discarded and the filter cake is placed in a glass dish, which is then placed in a vacuum drying oven at 80°C for 12 hours.

[0051] Grinding: Move the dried polyetheretherketone into a mortar and grind it briefly. Store the ground hydroxylated polyetheretherketone in a plastic bag for later use.

[0052] The difference between Preparation Examples 1-3 is the reaction time in step (4).

[0053] sample Reaction time (h) Degree of hydroxylation (%) Preparation Example 1 6 70 Preparation Example 2 8 80 Preparation Example 3 10 85

[0054] Preparation Example of Lithium Magnesium Silicate Sol

[0055] Preparation Examples 4-7

[0056] The following is a detailed description taking Preparation Example 4 as an example.

[0057] Preparation Example 4:

[0058] Mix 10 g of polyvinyl alcohol with 50 g of deionized water, and heat to 90° C. while stirring until the polyvinyl alcohol is completely dissolved to prepare a polyvinyl alcohol aqueous solution;

[0059] Then, 1 g of lithium magnesium silicate was added to 100 g of deionized water and magnetically stirred for 30-45 minutes to prepare a lithium magnesium silicate aqueous dispersion;

[0060] Adding butyl diglycol acetate to the lithium magnesium silicate aqueous dispersion in an amount of 3% of the lithium magnesium silicate dispersion, stirring uniformly, then slowly dropping a polyvinyl alcohol aqueous solution into the dispersion, stirring at 60° C. for 30 minutes to obtain a mixed solution;

[0061] The mixed solution was degassed in a vacuum degassing machine to obtain lithium magnesium silicate sol.

[0062] The difference between Preparation Examples 4-7 is the different added mass of diethylene glycol butyl ether acetate.

[0063] Table 1 Added mass of diethylene glycol butyl ether acetate in Preparation Example 4-7

[0064] sample Diethylene glycol butyl ether acetate (%) Viscosity of lithium magnesium silicate sol (cP) Preparation Example 4 3 1299 Preparation Example 5 1 1858 Preparation Example 6 5 1578 Preparation Example 7 0 3666 Example

[0065] Examples 1-5

[0066] A wear-resistant material for sealing high-speed rotating parts, comprising the following components: silicon carbide, hydroxylated modified polyetheretherketone, composite fiber, magnesium silicate lithium sol, and a silane coupling agent; wherein the silicon carbide has a particle size of 30 μm, the hydroxylated modified polyetheretherketone is prepared in Preparation Example 1, the magnesium silicate lithium sol is prepared in Preparation Example 4, and the silane coupling agent is KH-550;

[0067] The preparation method of the wear-resistant material is:

[0068] The composite fiber is prepared by mixing short-cut carbon fibers with a length of 1-3 mm and short-cut aramid fibers with a length of 100-200 μm in a mass ratio of 2:1;

[0069] Evenly add hydroxy silicone oil to the surface of the composite fiber, wrap the composite fiber with the hydroxy silicone oil with a plastic film, and seal and store for 12 hours;

[0070] Then the composite fiber was placed in lithium magnesium silicate sol and immersed at room temperature for 1 hour;

[0071] The lithium magnesium silicate sol impregnated with the composite fiber was stirred at a speed of 35 r / min;

[0072] Add the hydroxylated modified polyetheretherketone into a single screw extruder, heat it to 370-420°C, add the above-mentioned fiber-impregnated magnesium silicate lithium sol and silane coupling agent under stirring, and blend for 30 minutes;

[0073] Add silicon carbide, mix and stir for 45 minutes, and extrude into shape.

[0074] The difference between Examples 1-5 is that the formulations of the wear-resistant materials are different.

[0075] Table 2 Formulations of wear-resistant materials of Examples 1-5

[0076] sample Silicon carbide (g) Hydroxylation modified polyetheretherketone (g) Composite fiber (g) Lithium magnesium silicate sol (g) Silane coupling agent (g) Example 1 40 10 3 5 1 Example 2 45 15 5 7 1.2 Example 3 50 20 7 10 1.5 Example 4 55 25 8 12 1.8 Example 5 60 30 10 15 2

[0077] Examples 6-7

[0078] The difference between Example 6-7 and Example 2 is that the hydroxylated polyetheretherketone adopts Preparation Example 2-3.

[0079] Table 3 The hydroxylated polyetheretherketones in Examples 6-7 are different

[0080] sample Hydroxylated polyetheretherketone Example 6 Preparation Example 2 Example 7 Preparation Example 3

[0081] Example 8

[0082] The difference between this embodiment and embodiment 2 is that the particle size of silicon carbide is different. In this embodiment, the particle size of silicon carbide is 50-80 μm.

[0083] Examples 9-11

[0084] The difference between Examples 9-11 and Example 2 is that different lithium magnesium silicate sols are used.

[0085] Table 4 The magnesium silicate lithium sols of Examples 9-11 are different

[0086] sample Lithium magnesium silicate sol Example 9 Preparation Example 5 Example 10 Preparation Example 6 Example 11 Preparation Example 7

[0087] Comparative Example

[0088] A wear-resistant material includes the following components by mass: 40g of silicon carbide, 10g of polyetheretherketone, 3g of carbon fiber, and 1g of a silane coupling agent; wherein the silicon carbide has a particle size of 30μm, the carbon fiber is chopped carbon fiber with a length of 1-3mm, and the silane coupling agent is KH550.

[0089] The wear-resistant material is prepared by the following method:

[0090] Evenly add hydroxy silicone oil to the surface of the composite fiber, wrap the composite fiber with the hydroxy silicone oil with a plastic film, and seal and store for 12 hours;

[0091] Add polyetheretherketone into a single-screw extruder, heat to 370-420°C, add the above composite fiber and silane coupling agent under stirring, and blend for 30 minutes;

[0092] Add silicon carbide, mix and stir for 30-45 minutes, and extrude into shape.

[0093] Detection methods:

[0094] Tensile Strength: Mechanical testing was conducted using a CTM-C104 electronic universal testing machine. Samples weighing 25g were placed in a 170×24×6cm bar mold. The sample was heated and melted with a pre-compression pressure of 7.5 MPa for 3 minutes. The bar mold was then placed in a flatbed vulcanizer for compression molding at a pressure of 7.5 MPa and a hold time of 10 minutes. Tensile properties were tested using the CTM-C104 microelectronic universal testing machine in accordance with GB / T1040.2-2006 at a loading speed of 5 mm / min. Five samples were tested per group. Tensile strength is the average of the experimental values.

[0095] Impact strength: According to GB / T1043.1-2008, the simply supported beam notch impact toughness of the sample is tested in an impact testing machine (at room temperature). The impact strength of the material is δ, in kJ / m 2 .

[0096] δ = F / A (a)

[0097] In formula (a), F is the fracture impact energy, unit is J; A is the cross-sectional area of the fracture, unit is mm 2 .

[0098] Wear resistance:

[0099] Friction and wear tests were conducted on an MMS-2A friction and wear testing machine. The specimens were 50mm x 40mm x 3mm specimens made from the wear-resistant materials of the examples and comparative examples, with AISI 52100 steel rings as the mating element. Under water lubrication conditions, the specimens were tested for wear against the steel rings at a sliding speed of 200 r / min and a load of 200 N against a grinding block for 40 minutes. The friction and wear coefficient and specific wear rate were calculated.

[0100] The test results of Examples 1-11 and Comparative Examples are shown in Tables 5-6

[0101] Table 5 Mechanical properties test results of Examples 1-11 and Comparative Examples

[0102] sample Tensile strength (MPa) <![CDATA[Impact strength (KJ / m 2 )]]> Surface condition Example 1 88.2 7.13 The surface is smooth, complete and without fine lines Example 2 98.6 8.96 The surface is smooth, complete and without fine lines Example 3 99.1 9.22 The surface is smooth, complete and without fine lines Example 4 98.7 9.15 The surface is smooth, complete and without fine lines Example 5 88.6 7.82 The surface is smooth, complete and without fine lines Example 6 101.3 9.83 The surface is smooth, complete and without fine lines Example 7 99.66 9.22 The surface is smooth, complete and without fine lines Example 8 96.5 8.32 The surface is smooth, complete and without fine lines Example 9 93.6 8.22 The surface is smooth, complete and without fine lines Example 10 94.8 8.39 The surface is smooth, complete and without fine lines Example 11 85.6 6.68 The surface is slightly rough with fine lines Comparative Example 55.3 3.86 Rough and cracked surface

[0103] Table 6 Test results of friction and wear properties of Examples 1-11 and comparative examples

[0104] sample Friction coefficient <![CDATA[Specific wear rate (×10 -6 mm 3 / N·m)]]> Example 1 0.28 0.79 Example 2 0.23 0.68 Example 3 0.20 0.59 Example 4 0.21 0.63 Example 5 0.30 0.81 Example 6 0.20 0.70 Example 7 0.26 0.72 Example 8 0.32 0.79 Example 9 0.26 0.71 Example 10 0.28 0.72 Example 11 0.34 0.86 Comparative Example 0.38 0.94

[0105] Combined with the test results of Examples 1-5, Comparative Examples and Tables 5-6, it can be seen that the addition of hydroxylated modified PEEK, magnesium silicate lithium sol and composite fiber to the silicon carbide material in the present application can significantly improve the mechanical properties and wear resistance of the wear-resistant material, and the surface is smooth, complete and free of fine lines, wherein the mass proportion of silicon carbide is 55%-62%, the proportion of hydroxylated polyetheretherketone is 20%-25%, the proportion of composite fiber is 6.8%-8%, and the proportion of magnesium silicate lithium sol is 10%-12%.

[0106] Combined with the test results of Example 2, Examples 6-7 and Table 5, it can be seen that the degree of hydroxylation of polyetheretherketone will also affect the mechanical properties and wear resistance of the wear-resistant material. This is because the surface roughness of polyetheretherketone is significantly increased by hydroxylation, which helps to provide more active sites, thereby improving the reaction activity with magnesium silicate lithium sol, promoting the full reaction of magnesium silicate lithium sol with hydroxylated modified polyetheretherketone, and making the prepared wear-resistant material have excellent mechanical properties and wear resistance.

[0107] Combining the test results of Example 2 and Example 8 and Table 5, it can be seen that when the particle size of silicon carbide is 50-80 μm, the mechanical properties of the prepared wear-resistant material decrease slightly. This may be because as the particle size of silicon carbide increases, it is not easy to be evenly dispersed in the reaction system, and the density between silicon carbide particles decreases, which affects the mechanical properties and wear resistance of the wear-resistant material.

[0108] Combined with the test results of Example 2, Examples 9-11 and Table 5, it can be seen that when preparing the lithium magnesium silicate sol, the present application adds 1%-5% of diethylene glycol butyl ether acetate, wherein when the addition amount is 3%, a wear-resistant material with excellent wear resistance and mechanical properties can be prepared. Without the addition of diethylene glycol butyl ether acetate, the viscosity of the lithium magnesium silicate sol is relatively large, and when mixed with other components, its dispersibility is relatively poor, thereby affecting the mechanical properties and wear resistance of the wear-resistant material. The interaction between diethylene glycol butyl ether acetate and the lithium magnesium silicate molecules is greater than the interaction between polyvinyl alcohol and lithium magnesium silicate, which helps to reduce the physical crosslinking points of lithium magnesium silicate between polyvinyl alcohol molecular chains. Therefore, the addition of diethylene glycol butyl ether acetate can reduce the gelation of the lithium magnesium silicate sol, thereby achieving the stable preparation of the lithium magnesium silicate sol; at the same time, diethylene glycol butyl ether acetate has excellent film-forming properties, which helps to further improve the wear resistance of the wear-resistant material.

Claims

1. A wear-resistant material for sealing high-speed rotating parts, used in the friction working area between rotating parts and stationary parts, characterized in that: The wear-resistant material comprises the following components in parts by weight: 40-60 parts of silicon carbide, 10-30 parts of hydroxylated modified polyetheretherketone, 3-10 parts of composite fiber, 5-15 parts of magnesium silicate lithium sol, and 1-2 parts of silane coupling agent; the hydroxylation degree of the hydroxylated modified polyetheretherketone is 70%-85%; the composite fiber is a mixture of carbon fiber and aramid fiber in a mass ratio of 1.8-2:1; The magnesium silicate lithium sol is prepared according to the following method: Mix polyvinyl alcohol with deionized water and heat to 90-95 o C, until the polyvinyl alcohol is dissolved to form a polyvinyl alcohol aqueous solution with a mass concentration of 15%-20%; Then, lithium magnesium silicate was added into deionized water and magnetically stirred for 30-45 minutes to prepare a lithium magnesium silicate aqueous dispersion having a mass concentration of 0.8%-1.2%; Add diethylene glycol butyl ether acetate to the lithium magnesium silicate aqueous dispersion, the added mass of diethylene glycol butyl ether acetate is 1-5% of the lithium magnesium silicate dispersion, stir evenly, then slowly drop the polyvinyl alcohol aqueous solution into the dispersion at 50-60 o C temperature and stirred for 30-40 min to obtain a mixed solution; The mixed solution was degassed in a vacuum degassing machine to obtain lithium magnesium silicate sol.

2. The wear-resistant material for sealing high-speed rotating parts according to claim 1, characterized in that: The wear-resistant material comprises the following components in parts by weight: 45-55 parts of silicon carbide, 15-25 parts of hydroxylated modified polyetheretherketone, 5-8 parts of composite fiber, 8-12 parts of magnesium silicate lithium sol, and 1.2-1.8 parts of silane coupling agent.

3. The wear-resistant material for sealing high-speed rotating parts according to claim 1, characterized in that: The particle size of the silicon carbide is 30-50 μm.

4. The wear-resistant material for sealing high-speed rotating parts according to claim 1, characterized in that: The carbon fibers are short-cut carbon fibers with a length of 1-3 mm, and the aramid fibers are short-cut aramid fibers with a length of 100-200 μm.

5. The method for preparing a wear-resistant material for sealing a high-speed rotating component according to any one of claims 1 to 4, characterized in that: Prepared by the following steps: The composite fiber is placed in a magnesium silicate lithium sol and immersed at room temperature for 1-1.5 hours to obtain the magnesium silicate lithium sol impregnated with the fiber; the hydroxylated modified polyetheretherketone is heated and melted, and the magnesium silicate lithium sol impregnated with the fiber and the silane coupling agent are added under stirring conditions and blended for 10-30 minutes; silicon carbide is added, mixed and stirred for 30-45 minutes, and extruded and granulated to obtain a wear-resistant material.

6. The method for preparing a wear-resistant material for sealing a high-speed rotating component according to claim 5, characterized in that: Place the composite fiber before the magnesium silicate lithium sol, evenly add hydroxy silicone oil to the surface of the composite fiber, and seal it for 12-24 hours.

7. Use of the wear-resistant material for sealing high-speed rotating parts according to any one of claims 1 to 4, characterized in that: The wear-resistant material is used to process seals between high-speed rotating parts and stationary parts.