An epoxy resin-based composite material resistant to friction and salt water corrosion, its preparation method and uses

Abstract

The present invention discloses an epoxy resin-based composite material resistant to friction and salt water corrosion, and its preparation method and uses. Among them, the epoxy resin-based composite material resistant to friction and salt water corrosion is composed of the following components: 0.1 to 1 part by weight of MXene, 10 to 50 parts by weight of PTFE, and 80 to 150 parts by weight of epoxy resin. The epoxy resin-based composite material resistant to friction and salt water corrosion in the present invention has a low friction coefficient, high thermal conductivity, high wear resistance and salt water corrosion resistance, and the preparation process is simple. The MXene material therein can enhance the wear resistance, thermal conductivity and mechanical properties of the composite coating, and PTFE mainly enhances the lubrication performance and salt water corrosion resistance of the composite coating.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials. Specifically, it is an epoxy resin-based composite material with friction resistance and salt water corrosion resistance, and its preparation method and uses. Background Art

[0002] Epoxy resin, as a thermosetting polymer with good chemical stability and strong adhesion ability on the surface of metal substrates, is widely used in the field of protective coatings on the surface of metal substrates in the shipbuilding industry and marine equipment. However, its poor wear resistance and salt water corrosion resistance limit its further development in the field of protective coatings. Once the epoxy resin used as a protective coating is worn, its protective performance will seriously decline, directly resulting in energy loss and economic losses. In the field of tribology, the friction coefficient of a material directly reflects its lubrication performance. The lower the friction coefficient, the better its lubrication performance. Therefore, an effective way to improve the lubrication performance of a material is to reduce the friction coefficient of the material so as to reduce the friction and wear between materials.

[0003] Polytetrafluoroethylene (PTFE), as a representative of high molecular lubricating materials, has high self-lubricity, thermal stability and chemical stability, and can be introduced into the epoxy resin matrix as a lubricant. However, its wear resistance is poor and its thermal conductivity is low. The low thermal conductivity is not conducive to the transfer and dissipation of frictional heat, resulting in serious friction oxidation and wear. Summary of the Invention

[0004] For this reason, the technical problem to be solved by the present invention is to provide an epoxy resin-based composite material with friction resistance and salt water corrosion resistance, and its preparation method and application. The epoxy resin-based composite material with friction resistance and salt water corrosion resistance in the present invention has a low friction coefficient, high thermal conductivity, high wear resistance and salt water corrosion resistance, and the preparation process is simple. The MXene material therein can enhance the wear resistance, thermal conductivity and mechanical properties of the composite coating, and PTFE mainly enhances the lubrication performance and salt water corrosion resistance of the composite coating.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] An epoxy resin-based composite material with friction resistance and salt water corrosion resistance, which is composed of the following components: 0.1 to 1 part by weight of MXene, 10 to 50 parts by weight of PTFE, and 80 to 150 parts by weight of epoxy resin.

[0007] For the above epoxy resin-based composite material with friction resistance and salt water corrosion resistance, the MXene is one or more of Mo2C, Mo2TiC2, V2C, V4C3, Ti3C2 and Ta4C3.

[0008] For the above epoxy resin-based composite material with friction resistance and salt water corrosion resistance, the MXene is a strip-shaped MXene.

[0009] For the above-mentioned epoxy resin-based composite material with friction resistance and salt water corrosion resistance, the organic solvent is ethyl acetate or absolute ethanol.

[0010] For the above-mentioned epoxy resin-based composite material with friction resistance and salt water corrosion resistance, the epoxy resin is one or more of epoxy resin E44, epoxy resin E58, and epoxy resin E51.

[0011] The preparation method of the above-mentioned epoxy resin-based composite material with friction resistance and salt water corrosion resistance includes the following steps:

[0012] Step 1) Add MXene powder into 4 - 10 ml of organic solvent, and ultrasonically disperse for 5 - 15 min to obtain a dispersion;

[0013] Step 2) Add PTFE micropowder into the dispersion obtained in Step 1), and ultrasonically disperse for 2 - 5 min to obtain a first mixed solution;

[0014] Step 3) Add epoxy resin into the first mixed solution obtained in Step 2), stir for 5 - 15 min, and then remove bubbles under vacuum for 5 - 10 min to obtain a composite material solution.

[0015] For the above method, the MXene is one or more of Mo2C, Mo2TiC2, V2C, V4C3, Ti3C2, and Ta4C3.

[0016] For the above method, the organic solvent is ethyl acetate or absolute ethanol.

[0017] For the above method, the epoxy resin is composed of one or more of epoxy resin E44, epoxy resin E58, and epoxy resin E51.

[0018] The use of the above-mentioned epoxy resin-based composite material with friction resistance and salt water corrosion resistance is for preparing wear-resistant coatings or wear-resistant components.

[0019] The technical solution of the present invention has achieved the following beneficial technical effects:

[0020] 1. MXene materials are a new type of solid lubricant material composed of transition metal carbides / nitrides, with excellent self-lubricating properties, wear resistance, and thermal conductivity. Therefore, in this invention, PTFE and MXene are simultaneously introduced into the epoxy resin matrix to prepare an epoxy resin-based composite coating for metal substrates with friction resistance and saltwater corrosion resistance. Among them, the MXene material acts as a solid filler in the polymer matrix and forms a stable "sea-island" structure, which can effectively enhance the mechanical properties, wear resistance, and thermal conductivity of the epoxy resin. In addition, PTFE and MXene can synergistically improve the saltwater corrosion resistance of the epoxy resin composite coating. This invention is of great significance for improving the friction resistance and saltwater corrosion resistance of the epoxy resin-based protective coating on the surface of metal substrates.

[0021] 2. The preparation process is stable and easy to operate, and the raw materials are easily available, enabling industrial production.

[0022] 3. The composite coating prepared by this invention has high lubricity and wear resistance.

[0023] 4. The composite coating prepared by this invention has excellent thermal conductivity and can reach 85% of the contact temperature within 10 s.

[0024] 5. The composite coating prepared by this invention has saltwater corrosion resistance, and its friction curve changes slightly after being immersed in saltwater for 72 h compared with that before immersion. Description of the Drawings

[0025] Figure 1 It is the optical photograph of the epoxy resin-based composite material coating sample with friction resistance and saltwater corrosion resistance in Example 1 of this invention;

[0026] Figure 2 It is the comparison chart of the friction curves of the coatings prepared in Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 of this invention;

[0027] Figure 3 It is the scanning electron microscope image of Mo2C in this invention;

[0028] Figure 4 It is the three-dimensional diagram of the wear scar of the coating prepared in Example 1 of this invention. Detailed Embodiments

[0029] In the present invention, the epoxy resin-based composite material with friction resistance and salt water corrosion resistance is composed of the following components: 0.1-1 part by weight of MXene, 10-50 parts by weight of PTFE, and 80-150 parts by weight of epoxy resin. Among them, the specific ratio of each component can be set by itself according to needs, and the MXene can also be one or more selected from Mo2C, Mo2TiC2, V2C, V4C3, Ti3C2, and Ta4C3. The organic solvent can be ethyl acetate or absolute ethanol, and the epoxy resin can also be one or more selected from epoxy resin E44, epoxy resin E58, and epoxy resin E51.

[0030] Since the epoxy resin-based composite material with friction resistance and salt water corrosion resistance has good wear resistance, it can be used to prepare the surface coating of devices and the wear-resistant parts of some mechanical equipment. The following examples only take the preparation of the wear-resistant coating on the surface of the device as an example to illustrate the epoxy resin-based composite material with friction resistance and salt water corrosion resistance of the present invention.

[0031] Example 1

[0032] In this example, the epoxy resin-based composite material coating with friction resistance and salt water corrosion resistance is prepared through the following steps:

[0033] Step 1) Add 0.4 part of Mo2C powder into 4 ml of absolute ethanol, and ultrasonically disperse for 10 min to obtain a dispersion liquid; among them, the morphology of Mo2C is as Figure 3 shown, which is a strip-shaped morphology (including regular strips and irregular strips) with an aspect ratio greater than or equal to 1.5:1.

[0034] Step 2) Add 30 parts of PTFE micro-powder into the dispersion liquid obtained in Step 1), and ultrasonically disperse for 5 min to obtain a first mixed solution;

[0035] Step 3) Add 70 parts of epoxy resin into the first mixed liquid obtained in Step 2), stir for 5 min, and then remove bubbles under vacuum for 5 min to obtain a composite material solution; among them, the epoxy resin is Eric epoxy resin E44 from Shenzhen Mingde Chemical Co., Ltd.

[0036] Step 4) Drop the composite material solution obtained in Step 3) onto a 304 stainless steel plate, and spin-coat for 1 min (100 rpm) to prepare an epoxy resin-based composite material coating with friction resistance and salt water corrosion resistance;

[0037] Step 5) Place the stainless steel plate coated with the epoxy resin-based composite material coating with friction resistance and salt water corrosion resistance in Step 4) in an oven at 45 °C and cure for 48 h to obtain a sample of the epoxy resin-based composite material coating with friction resistance and salt water corrosion resistance.

[0038] In this embodiment, the optical photograph of the epoxy resin-based composite coating sample with friction resistance and salt water corrosion resistance is as Figure 1 shown.

[0039] Example 2

[0040] In this embodiment, the epoxy resin-based composite coating with friction resistance and salt water corrosion resistance is prepared by the following steps:

[0041] Step 1) Add 0.4 parts of Mo2TiC2 powder to 5 ml of ethyl acetate, and ultrasonically disperse for 10 min to obtain a dispersion;

[0042] Step 2) Add 30 parts of PTFE micropowder to the dispersion obtained in Step 1), and ultrasonically disperse for 5 min to obtain a first mixed solution;

[0043] Step 3) Add 70 parts of epoxy resin to the first mixed solution obtained in Step 2, stir for 5 min, and then remove bubbles under vacuum for 5 min to obtain a composite material solution;

[0044] Step 4) Drop the composite material solution obtained in Step 3 onto a 304 stainless steel plate, and spin-coat for 1 min (100 rpm) to prepare an epoxy resin-based composite coating with friction resistance and salt water corrosion resistance;

[0045] Step 5) Place the stainless steel plate coated with the epoxy resin-based composite coating with friction resistance and salt water corrosion resistance in Step 4 in an oven at 45 °C and cure for 48 h to obtain an epoxy resin-based composite coating sample with friction resistance and salt water corrosion resistance.

[0046] In this embodiment, the epoxy resin is Eric epoxy resin E44 from Shenzhen Mingde Chemical Co., Ltd.

[0047] Example 3

[0048] In this embodiment, the epoxy resin-based composite coating with friction resistance and salt water corrosion resistance is prepared by the following steps:

[0049] Step 1) Add 0.5 parts of Mo2C powder to 5 ml of ethyl acetate, and ultrasonically disperse for 10 min to obtain a dispersion;

[0050] Step 2) Add 30 parts of PTFE micropowder to the dispersion obtained in Step 1), and ultrasonically disperse for 5 min to obtain a first mixed solution;

[0051] Step 3) Add 70 parts of epoxy resin to the first mixed solution obtained in Step 2, stir for 5 min, and then remove bubbles under vacuum for 5 min to obtain a composite material solution;

[0052] Step 4) Drop the defoamed composite coating obtained in Step 3) onto a 304 stainless steel plate and spin-coat it for 1 min (100 rpm) to obtain an epoxy resin-based composite coating with friction resistance and salt water corrosion resistance.

[0053] Step 5) Place the stainless steel plate coated with the epoxy resin-based composite coating with friction resistance and salt water corrosion resistance in Step 4) in an oven at 35 °C and cure it for 72 h to obtain a sample of the epoxy resin-based composite coating with friction resistance and salt water corrosion resistance.

[0054] In this example, the epoxy resin is Eric Epoxy Resin E44 from Shenzhen Mingde Chemical Co., Ltd.

[0055] Comparative Example 1

[0056] The coating in this example is an epoxy resin coating without the addition of MXene or / and PTFE.

[0057] Comparative Example 2

[0058] The coating in this example is an epoxy resin coating added with MXene. Among them, the dosage of MXene accounts for 0.4 wt% of the epoxy resin coating, and the dosage of MXene in this example is the optimal dosage of MXene selected according to Table 1.

[0059] Table 1 Average Friction Coefficient of Epoxy Resin Coatings Containing Different Amounts of MXene

[0060]

[0061] Comparative Example 3

[0062] The coating in this example is an epoxy resin coating added with PTFE. Among them, the dosage of PTFE accounts for 30 wt% of the epoxy resin coating, and the dosage of PTFE in this example is the optimal dosage of PTFE selected according to Table 2.

[0063] Table 2 Average Friction Coefficient of Epoxy Resin Coatings Containing Different Amounts of PTFE

[0064]

[0065] Conduct friction resistance tests on the coatings prepared in Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 to obtain the friction curves as Figure 2 shown. From Figure 2It can be seen that the friction curve of the coating prepared in Example 1 is lower than that of the coating prepared in Comparative Example 1, and also lower than the friction curves of the coatings prepared in Comparative Example 2 and Comparative Example 3. This indicates that the friction resistance performance of the coating prepared from the friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material in the present invention is superior to that of the epoxy resin coating, the epoxy resin coating added with MXene, and the epoxy resin coating added with PTFE. Moreover, from Figure 2 the trend of the friction curves of the coatings prepared in Comparative Example 2 and Comparative Example 3 in Figure 4 and the friction curve of the coating prepared in Example 1, it can be seen that MXene and PTFE have a certain synergistic effect on the friction resistance performance provided in the friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material of the present invention, that is, MXene and PTFE can improve each other's friction resistance performance in epoxy resin. Among them, the three-dimensional diagram of the wear scar of the coating prepared in Example 1 is as shown in

[0066] The coatings prepared in Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 were subjected to a saltwater corrosion resistance test. The test conditions were soaking in a 5wt% sodium chloride solution for 72h, and then the average friction coefficient of the coating was measured. The test results are shown in Table 3.

[0067] Table 3 Average friction coefficients of the coatings before and after soaking in saltwater for 72h

[0068]

[0069] From the data recorded in Table 3, it can be seen that the friction coefficients of the coatings prepared in Comparative Example 1, Comparative Example 2, and Comparative Example 3 increased significantly after soaking in saltwater, indicating that the coatings prepared in Comparative Examples 1-3 have poor saltwater corrosion resistance. However, the friction coefficient of the coating of the friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material in the present invention did not change significantly after soaking in saltwater, indicating that the friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material prepared in the present invention has excellent saltwater corrosion resistance. In addition, when the coating of the friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material prepared in Example 1 was placed on a heating table at 60°C for 30s, the surface temperature of the coating of the friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material could reach 51°C, indicating that the friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material has excellent thermal conductivity, and the excellent thermal conductivity can reduce local oxidation caused by the accumulation of frictional heat during the friction process of the coating.

[0070] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the claims of this patent application.

Claims

1. An epoxy resin-based composite material that is resistant to friction and salt water corrosion, characterized in that: It consists of the following components: 0.4-0.5 parts by weight of MXene, 30 parts by weight of PTFE, and 70 parts by weight of epoxy resin; wherein the MXene is Mo2C or Mo2TiC2.

2. The friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material according to claim 1, characterized in that: The MXene is a MXene with a strip-like morphology.

3. The friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material according to claim 1, characterized in that: The organic solvent is ethyl acetate or anhydrous ethanol.

4. The friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material according to claim 1, characterized in that: The epoxy resin is one or more of epoxy resin E44, epoxy resin E58 and epoxy resin E51.

5. The method for preparing the friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material according to claim 1, characterized in that: The steps include: Step 1) adding MXene powder to 4-10 ml of an organic solvent and ultrasonically dispersing for 5-15 min to obtain a dispersion, wherein the MXene is Mo2C or Mo2TiC2; Step 2) adding PTFE powder to the dispersion obtained in step 1) and ultrasonically dispersing for 2 to 5 minutes to obtain a first mixed solution; Step 3) adding epoxy resin to the first mixed solution obtained in step 2) and stirring for 5 to 15 minutes, and then vacuum degassing for 5 to 10 minutes to obtain a composite material solution.

6. The method according to claim 5, characterized in that The organic solvent is ethyl acetate or anhydrous ethanol.

7. The method according to claim 5, characterized in that The epoxy resin is one or more of epoxy resin E44, epoxy resin E58 and epoxy resin E51.

8. The use of the friction-resistant and saltwater-corrosion-resistant epoxy resin-based composite material according to claim 1, characterized in that: Used to prepare wear-resistant coatings or wear-resistant parts.

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