Epoxy resin-based coating liquid composition, method for producing the same, and use thereof

Abstract

The present application provides a new epoxy resin-based coating liquid composition, its preparation method and application, the coating liquid composition has the characteristics of small friction coefficient and low wear rate of the solid lubricating layer prepared therefrom, and the technical scheme is: the epoxy resin-based coating liquid composition comprises the following components by weight: epoxy resin, 100 parts; solid lubricant, 20-100 parts; coupling agent, 5-15 parts; solvent, 40-500 parts; the solid lubricant comprises molybdenum disulfide and / or graphite.

Description

Technical Field

[0001] This invention relates to epoxy resin-based coating liquid compositions, their preparation methods, and applications. Background Technology

[0002] Solid lubricating layers comprise a resin matrix and a solid lubricant. Due to the special properties of epoxy resin, it is often used as the resin matrix for solid lubricating layers. This solid lubricating layer is obtained by applying a coating liquid containing epoxy resin and a solid lubricant (such as graphite and molybdenum disulfide) to the surface of the substrate to be coated, followed by curing. CN 108753106 A discloses a nano-hybrid modified epoxy resin self-lubricating composite coating and its preparation method; CN117866512A discloses an anti-erosion, anti-corrosion, and wear-resistant coating and its preparation method and application; CN 116535933 A discloses a resin coating liquid suitable for oil lubrication and its preparation method and application. They all share the common feature of using epoxy resin and solid lubricant components, with one of their goals being to obtain a good solid lubricating coating. However, the compatibility between existing solid lubricants and their components needs improvement, and the performance of the solid lubricating layer needs further enhancement. Summary of the Invention

[0003] One of the technical problems to be solved by the present invention is to provide a new epoxy resin-based coating liquid composition, wherein the solid lubricating layer prepared therefrom has the characteristics of low friction coefficient and low wear rate.

[0004] To solve one of the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] An epoxy resin-based coating liquid composition, by weight, comprises the following components:

[0006] Epoxy resin, 100 parts;

[0007] Solid lubricant, 20-100 parts;

[0008] Coupling agent, 5-15 parts;

[0009] Solvent, 40-500 parts;

[0010] The solid lubricant includes molybdenum disulfide and / or graphite.

[0011] The use of coupling agents improves the compatibility of solid lubricants in the coating liquid composition, resulting in a solid lubricating layer with a low coefficient of friction and low wear rate prepared from the coating liquid composition.

[0012] In the above technical solution, the coupling agent preferably conforms to the structural formula shown in Formula 1 below:

[0013]

[0014] Wherein, R1 to R3 are independently C1 to C4 alkyl groups; for example, but not limited to, R1 to R3 being independently C1 alkyl groups, C2 alkyl groups, C3 alkyl groups, and C4 alkyl groups.

[0015] G is an aliphatic group, and the structure of G contains at least one of the following functional groups: carbon-carbon double bond, epoxy group, amino group, and mercapto group. Preferably, the structure of G contains an epoxy group or a mercapto group.

[0016] All epoxy resins well known to those skilled in the art can be used in this invention. There are many types of epoxy resins, such as bisphenol A type epoxy resin prepared from bisphenol A and epichlorohydrin, glycerol epoxy resin prepared from glycerol and epichlorohydrin, butene epoxy resin prepared from polybutene oxidation, and cyclopentadiene epoxy resin prepared from dicyclopentadiene epoxidation. Among these, bisphenol A type epoxy resin accounts for the largest share and is the most widely used. Therefore, in the above technical solution, the epoxy resin is preferably a bisphenol A type epoxy resin.

[0017] The bisphenol A type epoxy resin of the present invention has the following structure:

[0018]

[0019] Where n ranges from 0 to 25, for example, but not limited to n being 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, etc. Generally, low molecular weight epoxy resins have an average n of less than 2 and a softening point below 50℃; medium molecular weight epoxy resins have n of 2 to 5 and a softening point between 50 and 95℃; when the n value is greater than 5, it belongs to high molecular weight epoxy resins and the softening point is above 100℃.

[0020] The bisphenol A type epoxy resin to which this invention is applicable has an epoxy equivalent of 170 to 4000 g / mol, for example, but not limited to, epoxy equivalents of 170 g / mol, 180 g / mol, 190 g / mol, 200 g / mol, 210 g / mol, 220 g / mol, 230 g / mol, 240 g / mol, 250 g / mol, 260 g / mol, 270 g / mol, 300 g / mol, 350 g / mol, 400 g / mol, 500 g / mol, 600 g / mol, 700 g / mol, 800 g / mol, 900 g / mol, 1000 g / mol, 1500 g / mol, 2000 g / mol, 2500 g / mol, 3000 g / mol, 3500 g / mol, 4000 g / mol, etc. The resin types conforming to this invention (described according to the specifications of GB / T13657-2011 (Bisphenol A type epoxy resins)) include, but are not limited to, EP01431 310 epoxy resin with an epoxy equivalent of 170-184 g / mol, EP01441 310 epoxy resin with an epoxy equivalent of 183-200 g / mol, EP01451 310 epoxy resin with an epoxy equivalent of 210-240 g / mol, EP01551 310 epoxy resin with an epoxy equivalent of 238-270 g / mol, EP01661 310 epoxy resin with an epoxy equivalent of 450-560 g / mol, EP01671 310 epoxy resin with an epoxy equivalent of 730-950 g / mol, and EP01691 with an epoxy equivalent of 2300-4000 g / mol. 410 epoxy resin.

[0021] For comparative purposes only, the epoxy resins used in this invention specification are all EP01441 310 epoxy resins with an epoxy equivalent of 183-200 g / mol (the corresponding grades in the market are E51 epoxy resin, 0164 epoxy resin, 850S, WSR618 epoxy resin, DYD-128 epoxy resin, NPEL-128 epoxy resin, CYD-128 epoxy resin, GELR128 epoxy resin, and SM-828 epoxy resin). Specifically, this invention uses Baling Petrochemical's CYD-128 epoxy resin.

[0022] In the above technical solutions, as a non-limiting example, the number of parts of solid lubricant is 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, etc. More preferably, it is 30 to 70.

[0023] In the above technical solution, the preferred weight ratio of graphite to molybdenum disulfide is 0.3 to 0.9. As a non-limiting example, the weight ratio of graphite to molybdenum disulfide is 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, etc.

[0024] In the above technical solution, it is preferred that the particle size of molybdenum disulfide and the particle size of graphite are independently below 20 μm. For example, but not limited to, the particle size of molybdenum disulfide and the particle size of graphite are independently 0.1 μm, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, etc.

[0025] For comparison only, the molybdenum disulfide used in the specific embodiments of the present invention is produced by Shanghai Colloidal Chemical Plant with a particle size of 0.1-10 μm, and the graphite is produced by Shanghai Colloidal Chemical Plant with a particle size of 0.1-10 μm.

[0026] When the structural formula of G contains a carbon-carbon double bond, G can be a vinyl group; or when the structural formula of G contains a carbon-carbon double bond, G can be an aliphatic group conforming to the following formula 2a:

[0027] H2C = CH-R4-, Equation 2a;

[0028] R4 is an alkylene group, more preferably a C1 to C6 alkylene group (e.g., C1 alkylene, C2 alkylene, C3 alkylene, C4 alkylene, C5 alkylene, C6 alkylene); by way of example only, the coupling agent in this case is, for example but not limited to, vinyltrimethoxysilane (CAS 2768-02-7) or vinyltriethoxysilane (CAS 78-08-0), etc.

[0029] When the structural formula of G contains a carbon-carbon double bond, G can be selected from aliphatic groups conforming to the following formula 3b:

[0030]

[0031] Wherein, R5 is H or a C1-C4 alkyl group (e.g., R5 can be H, a C1 alkyl group, a C2 alkyl group, a C3 alkyl group, or a C4 alkyl group); R6 is an alkylene group, preferably a C1-C6 alkylene group (e.g., R6 can be a C1 alkylene group, a C2 alkylene group, a C3 alkylene group, a C4 alkylene group, a C5 alkylene group, or a C6 alkylene group); by way of example only, the coupling agent at this time is, for example, but not limited to, 3-methacryloxypropyltrimethoxysilane (CAS 2530-85-0), 3-methacryloxypropyltriethoxysilane (CAS 21142-29-0), acryloxypropyltrimethoxysilane (CAS 21134-38-3), acryloxypropyltriethoxysilane (CAS 20208-39-3), etc.

[0032] When the structural formula of G contains an epoxy group, G can be selected from aliphatic groups conforming to the following formula 4c:

[0033]

[0034] Wherein R7 is an alkylene group, preferably a C1 to C6 alkylene group (e.g., C1 alkylene group, C2 alkylene group, C3 alkylene group, C4 alkylene group, C5 alkylene group, or C6 alkylene group); by way of example only, the coupling agent in this case is, for example but not limited to, 3-glycidoxypropyltrimethoxysilane (CAS 2530-83-8), 3-glycidoxypropyltriethoxysilane (CAS 2602-34-8), etc.

[0035] When the structural formula of G contains an amino group, G can be selected from the aliphatic groups shown in formula 5d below:

[0036] H2N-R8-, Formula 5d;

[0037] R8 is an alkylene group, preferably a C1 to C6 alkylene group (e.g., R8 can be a C1 alkylene group, a C2 alkylene group, a C3 alkylene group, a C4 alkylene group, a C5 alkylene group, or a C6 alkylene group); by way of example only, the coupling agent in this case is, for example but not limited to, 3-aminopropyltrimethoxysilane (CAS 13822-56-5), 3-aminopropyltriethoxysilane (CAS 919-30-2), etc.

[0038] When the structural formula of G contains a thiol group, G can be selected from aliphatic groups conforming to the following formula 6e:

[0039] HS-R9-, Formula 6e;

[0040] Wherein R9 is an alkylene group, preferably a C1 to C6 alkylene group (e.g., R9 can be a C1 alkylene group, a C2 alkylene group, a C3 alkylene group, a C4 alkylene group, a C5 alkylene group, or a C6 alkylene group); by way of example only, the coupling agent in this case is, for example but not limited to, 3-mercaptopropyltrimethoxysilane (CAS 4420-74-0), 3-mercaptopropyltriethoxysilane (CAS 14814-09-6), etc.

[0041] In the above technical solutions, as a non-limiting example, the number of coupling agents is 6, 7, 8, 9, 10, 11, 12, 13, 14, etc.

[0042] In the above technical solution, the coupling agent preferably includes both an epoxy-containing coupling agent (hereinafter referred to as an epoxy-containing coupling agent) and a mercapto-containing coupling agent (hereinafter referred to as a mercapto-containing coupling agent) in the structure of G. The epoxy-containing coupling agent and the mercapto-containing coupling agent have a mutually promoting effect in reducing the friction coefficient and wear rate.

[0043] In the above technical solutions, as a non-limiting example, the weight ratio of epoxy-containing coupling agent to mercapto-containing coupling agent is 0.5 to 10. More specifically, the weight ratio of epoxy-containing coupling agent to mercapto-containing coupling agent is 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8, 9, etc., and more preferably 1 to 3.

[0044] As a non-limiting example, the number of parts of the solvent is 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200, 240, 260, 280, 300, 320, 340, 360, 380, 400, 420, 440, 460, 480, etc. More preferably, it is 100 to 300 parts.

[0045] In the above technical solution, the solvent is preferably an organic solvent, more preferably an aprotic organic solvent, and most preferably an aprotic polar organic solvent. For example, but not limited to, the solvent includes at least one substance selected from the group consisting of dimethyl sulfoxide (DMSO), N,N-dimethylacetamide (DMF), N-methylpyrrolidone (NMP), acetone, 2-butanone, methyl isobutyl ketone, and cyclohexanone.

[0046] In the above technical solution, when the coating liquid composition includes 0.1 to 2 parts by weight of a sulfone compound as shown in Formula 7, it is beneficial to reduce the friction coefficient and wear rate of the solid lubricating layer.

[0047]

[0048] Among them, R can be selected. 10 and R 11One of them is aryl, and the other is aryl or alkyl; more preferably R 10 and R 11 All are aryl groups. The alkyl group is preferably a C1-C3 alkyl group, and / or the aryl group is preferably a C6-C10 aryl group. For example, specific compounds may be methyl phenyl sulfone (CAS 3112-85-4), diphenyl sulfone (CAS 127-63-9), etc.

[0049] More specific, non-limiting examples of the amount of the compound shown in Formula 7 include, for example, 0.2 parts by weight, 0.3 parts by weight, 0.4 parts by weight, 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, 1 part by weight, 1.1 parts by weight, 1.2 parts by weight, 1.3 parts by weight, 1.4 parts by weight, 1.5 parts by weight, 1.6 parts by weight, 1.7 parts by weight, 1.8 parts by weight, 1.9 parts by weight, etc. More preferably, 0.5 to 1.5 parts.

[0050] In the above technical solution, the composition preferably includes an epoxy resin curing agent.

[0051] To increase the storage stability of epoxy resin-based coating liquid compositions containing curing agents, latent curing agents are preferred. Those skilled in the art will know that a latent curing agent refers to a curing agent that, when added to epoxy resin, forms a single-component system with which it exhibits certain storage stability at room temperature, but can rapidly undergo a curing reaction under curing conditions.

[0052] There are no particular restrictions on the selection of epoxy resin curing agents. Those skilled in the art can make reasonable selections without expending creative effort, and all can achieve comparable technical results.

[0053] There are many types of epoxy resin curing agents available in the prior art, such as fatty amines and modified fatty amines, aromatic diamines and modified aromatic diamines, dicyandiamides and modified dicyandiamides, imidazoles, organic acid anhydrides, organic hydrazides, Lewis acids, microcapsule curing agents, etc.

[0054] For comparative purposes only, the curing agents used in the specific embodiments of this invention are dicyandiamide and modified dicyandiamide curing agents. Therefore, it is necessary to provide a more detailed description of these curing agents. Dicyandiamide and modified dicyandiamide curing agents have excellent latency. Dicyandiamide has long been used as a latent curing agent, with a curing temperature between 150 and 170°C. However, when mixed with epoxy resin, dicyandiamide can be stored at room temperature for up to six months. Introducing amines, especially aromatic amines, into the dicyandiamide molecule can prepare dicyandiamide derivatives. For example, HT 2844, developed by Ciba Geigy in Switzerland, is a dicyandiamide derivative modified with 3,5-disubstituted aniline that can be cured at lower temperatures (e.g., a curing temperature of 100–150°C). This curing agent also exhibits good latency when mixed with epoxy resin and has excellent storage stability at room temperature.

[0055] As an example only, the amount of curing agent used in this invention can be selected as 4 to 10% of the weight of epoxy resin. For example, but not limited to, the amount of curing agent used is 5%, 6%, 7%, 8%, 9% of the weight of epoxy resin, etc. For comparison only, the amount used in this invention is 6% of the weight of epoxy resin.

[0056] The coating liquid composition of the present invention may also incorporate commonly used additives in the art, such as dispersants, leveling agents, pigments, etc., to provide the coating liquid with various other desired additional auxiliary properties.

[0057] The second technical problem to be solved by this invention is to provide a method for preparing an epoxy resin-based coating liquid composition. There are no particular limitations on the preparation method of the above-mentioned epoxy resin-based coating liquid composition; those skilled in the art can make reasonable choices without requiring inventive effort. For example, but not limited to:

[0058] A method for preparing an epoxy resin-based coating liquid composition, comprising:

[0059] (1) The epoxy resin is mixed with the solvent to obtain material 1;

[0060] (2) Mix the components other than the curing agent into material 1 to obtain material 2.

[0061] The above technical solution preferably further includes:

[0062] (3) Mix the curing agent into material 2.

[0063] In the above technical solution, those skilled in the art will understand that, in step (1), when the epoxy resin is a liquid, the process of mixing the epoxy resin with the solvent is preferably a process of diluting the epoxy resin by the solvent; or, when the epoxy resin in step (1) is a solid, the process of mixing the epoxy resin with the solvent is preferably a process of dissolving the epoxy resin in the solvent.

[0064] In the above technical solution, in step (3), the curing agent can be added in a commercially available form. However, those skilled in the art will understand that when the curing agent is solid, in order to improve the mixing efficiency of mixing the curing agent into the coating liquid composition, it is preferable to first dissolve the curing agent in a solvent and mix it into the coating liquid composition in the form of a curing agent solution.

[0065] The coating liquid composition can be obtained by simply mixing the required components according to the steps described above. If a curing agent with high room temperature curing activity is selected, the curing agent component is added at the coating site for ease of storage. If a curing agent with low curing activity under storage conditions is selected, as mentioned above, i.e., a latent curing agent as referred to in the art, the curing agent can be directly added to the coating liquid composition in the coating liquid composition production unit, thus avoiding the operational inconvenience of having to add the curing agent to the coating liquid composition at the coating site. As for the coupling agent, it can be simply mixed into the coating liquid. If a better coupling effect is desired, and the compatibility between the solid lubricant and the resin matrix is ​​further increased, the solid lubricant can be treated with the coupling agent first.

[0066] It should also be noted that coupling agents containing aliphatic amino groups in the structure of G, such as those conforming to formula 5d, can also be used in this invention and achieve comparable technical effects. However, since such amino groups have high reactivity with epoxy resins under storage conditions, which is detrimental to storage stability, it is not recommended to use such coupling agents in coating liquid composition formulations using latent curing agents.

[0067] The third technical problem this invention aims to solve is the application of epoxy resin-based coating liquids. The technical solution is:

[0068] The application of the epoxy resin-based coating liquid composition according to any one of the technical solutions to one of the above-mentioned technical problems, or the epoxy resin-based coating liquid composition obtained by any one of the preparation methods according to the technical solutions to the second technical problem, in the application of solid lubricating layers.

[0069] The key technology of this invention lies in the selection of the components and dosage of the coating liquid. Specifically, how to convert the coating liquid into a solid lubricating coating can be reasonably chosen by those skilled in the art without requiring creative effort, and comparable technical effects can be achieved. For example:

[0070] The fourth technical problem to be solved by this invention is to provide a method for constructing a solid lubricating layer. The technical solution is:

[0071] The construction methods for solid lubricant layers include:

[0072] (i) Obtaining the surface of the substrate for the material to be constructed;

[0073] (ii) Apply the coating liquid composition according to any one of the technical solutions of one of the above-mentioned technical problems or the coating liquid composition obtained according to any one of the preparation methods of the technical solution of the second technical problem to the surface of the substrate;

[0074] (iii) Curing steps of epoxy resin.

[0075] For comparison purposes only, in this specific embodiment, the curing agent added to the coating liquid composition used in step (ii) is a latent curing agent.

[0076] In the above technical solution, there are no special restrictions on the material to be coated in step (i). Those skilled in the art can make reasonable choices. For example, it can be metals such as steel, aluminum, and copper, or non-metallic materials such as glass and ceramics.

[0077] In the above technical solution, the coating method in step (ii) can be any of those known in the art, such as spraying, brushing, dipping, or rolling.

[0078] In the above technical solution, there are no special restrictions on the curing process conditions. Those skilled in the art can make reasonable selections based on the properties of epoxy resin and curing agent without having to expend creative effort.

[0079] As an example only, the curing temperature that can be used in the specific embodiments of the present invention is 150 to 170°C, such as, but not limited to, 152°C, 154°C, 156°C, 158°C, 160°C, 162°C, 164°C, 166°C, 168°C, etc.

[0080] As an example only, the curing time in the specific embodiments of the present invention can be 0.5 to 4 hours, for example, but not limited to curing times of 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours, etc.

[0081] The preparation method of the test block and the method of friction performance testing in this invention are as follows:

[0082] 1. Preparation of test blocks

[0083] The coating liquid composition obtained in the specific embodiment of the present invention was sprayed onto a Q235 carbon steel plate with a length, width and height of 25×7×4mm using an air spray gun. After curing at 160℃ for 2 hours, a solid lubricating layer was obtained. The solid lubricating layer with a thickness of 30±2μm was selected as the test block for friction performance testing.

[0084] 2. Friction performance test

[0085] 2.1 Coefficient of friction of solid lubricating layer

[0086] The friction and wear tester was used to conduct the test at 25℃ according to the standard GB / T 12444-2006 using an M-2000 friction and wear tester. During the test, the friction coefficient data was recorded every 0.1 seconds. Data with an error greater than 6 standard deviations were removed, and the arithmetic mean of the remaining data was used as the friction coefficient of the sample. The test ring was a standard 36mm diameter GCr15 steel ring provided with the tester. The test load was 100N, and the test was conducted for 30 minutes under this load. The linear velocity of the steel ring was 0.42m / s.

[0087] 2.2 Wear rate of solid lubricating layer

[0088] The wear volume and wear path of the test block were obtained by using an M-2000 friction and wear testing machine at 25℃ according to standard GB / T 12444-2006. The test ring was a standard 36mm diameter GCr15 steel ring provided with the testing machine. The test time was 30 minutes, and the linear velocity of the steel ring was 0.42m / s. The wear rate of the solid lubricating layer was then calculated using the following formula:

[0089] Ws = Vs / (L × F);

[0090] In the formula, Ws represents the wear rate (mm). 3 / (N·m)), Vs - wear volume (mm) 3 L - grinding distance (m), F - load (N);

[0091] Three parallel experiments were conducted, and the arithmetic mean was taken.

[0092] The present invention will now be described in detail through specific embodiments. Detailed Implementation

[0093] [Comparative Example]

[0094] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0095] Under stirring, 20 parts by weight of graphite and 40 parts by weight of molybdenum disulfide are added to material 1 to obtain material 2.

[0096] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide, stir to dissolve, and obtain material 3.

[0097] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0098] The coefficient of friction was measured to be 0.052, and the wear rate was 0.482 × 10⁻⁶. -6 mm 3 / (N·m).

[0099]

Example 1

[0100] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0101] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide and 8 parts by weight of vinyltriethoxysilane were added to material 1 to obtain material 2.

[0102] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide, stir to dissolve, and obtain material 3.

[0103] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0104] The coefficient of friction was measured to be 0.048, and the wear rate was 0.458 × 10⁻⁶. -6 mm 3 / (N·m).

[0105]

Example 2

[0106] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0107] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide and 8 parts by weight of 3-methacryloyloxypropyl-triethoxysilane were added to material 1 to obtain material 2.

[0108] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide, stir to dissolve, and obtain material 3.

[0109] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0110] The coefficient of friction was measured to be 0.042, and the wear rate was 0.456 × 10⁻⁶. -6 mm 3 / (N·m).

[0111]

Example 3

[0112] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0113] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide and 8 parts by weight of 3-glycidyl etheroxypropyl-triethoxysilane were added to material 1 to obtain material 2.

[0114] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide, stir to dissolve, and obtain material 3.

[0115] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0116] The coefficient of friction was measured to be 0.039, and the wear rate was 0.364 × 10⁻⁶. -6 mm 3 / (N·m).

[0117]

Example 4

[0118] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0119] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide and 8 parts by weight of 3-mercaptopropyltriethoxysilane were added to material 1 to obtain material 2.

[0120] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide, stir to dissolve, and obtain material 3.

[0121] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0122] The coefficient of friction was measured to be 0.041, and the wear rate was 0.430 × 10⁻⁶. -6 mm 3 / (N·m).

[0123]

Example 5

[0124] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0125] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide, 4 parts by weight of 3-glycidyl etheroxypropyl-triethoxysilane and 4 parts by weight of 3-mercaptopropyl-triethoxysilane are added to material 1 to obtain material 2.

[0126] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide, stir to dissolve, and obtain material 3.

[0127] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0128] The coefficient of friction was measured to be 0.037, and the wear rate was 0.258 × 10⁻⁶. -6 mm 3 / (N·m).

[0129]

Example 6

[0130] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0131] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide, 5 parts by weight of 3-glycidyl etheroxypropyl-triethoxysilane and 3 parts by weight of 3-mercaptopropyl-triethoxysilane are added to material 1 to obtain material 2.

[0132] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide, stir to dissolve, and obtain material 3.

[0133] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0134] The coefficient of friction was measured to be 0.033, and the wear rate was 0.242 × 10⁻⁶. -6 mm 3 / (N·m).

[0135]

Example 7

[0136] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0137] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide, 6 parts by weight of 3-glycidyl etheroxypropyl-triethoxysilane and 2 parts by weight of 3-mercaptopropyl-triethoxysilane are added to material 1 to obtain material 2.

[0138] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide, stir to dissolve, and obtain material 3.

[0139] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0140] The coefficient of friction was measured to be 0.036, and the wear rate was 0.255 × 10⁻⁶. -6 mm 3 / (N·m).

[0141]

Example 8

[0142] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0143] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide and 8 parts by weight of 3-glycidyl etheroxypropyl-triethoxysilane were added to material 1 to obtain material 2.

[0144] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide and 0.5 parts by weight of diphenyl sulfone, stir to dissolve, and obtain material 3.

[0145] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0146] The coefficient of friction was measured to be 0.037, and the wear rate was 0.325 × 10⁻⁶. -6 mm 3 / (N·m).

[0147]

Example 9

[0148] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0149] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide and 8 parts by weight of 3-glycidyl etheroxypropyl-triethoxysilane were added to material 1 to obtain material 2.

[0150] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide and 1 part by weight of diphenyl sulfone, stir to dissolve, and obtain material 3.

[0151] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0152] The coefficient of friction was measured to be 0.033, and the wear rate was 0.280 × 10⁻⁶. -6 mm 3 / (N·m).

[0153]

Example 10

[0154] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0155] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide and 8 parts by weight of 3-glycidyl etheroxypropyl-triethoxysilane were added to material 1 to obtain material 2.

[0156] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide and 1.5 parts by weight of diphenyl sulfone, stir to dissolve, and obtain material 3.

[0157] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0158] The coefficient of friction was measured to be 0.032, and the wear rate was 0.278 × 10⁻⁶. -6 mm 3 / (N·m).

[0159]

Example 11

[0160] Take 100 parts by weight of epoxy resin, add 180 parts by weight of methyl ethyl ketone, mix well to obtain material 1.

[0161] Under stirring, 20 parts by weight of graphite, 40 parts by weight of molybdenum disulfide, 5 parts by weight of 3-glycidyl etheroxypropyl-triethoxysilane and 3 parts by weight of 3-mercaptopropyl-triethoxysilane are added to material 1 to obtain material 2.

[0162] Take 20 parts by weight of DMF, add 6 parts by weight of dicyandiamide and 1 part by weight of diphenyl sulfone, stir to dissolve, and obtain material 3.

[0163] Add material 3 to material 2 under stirring, mix evenly, and obtain the coating liquid composition.

[0164] The coefficient of friction was measured to be 0.029, and the wear rate was 0.251 × 10⁻⁶. -6 mm 3 / (N·m).

Claims

1. An epoxy-based coating liquid composition comprising, by weight, the following components: an epoxy resin, 100 parts; a solid lubricant, 20-100 parts; a coupling agent, 5-15 parts; a solvent, 40-500 parts; the solid lubricant comprising molybdenum disulfide and / or graphite; the coupling agent comprising both an epoxy group-containing coupling agent and a mercapto group-containing coupling agent, the epoxy group-containing coupling agent conforming to Formula 1 below and having an aliphatic group containing an epoxy group in the G group, and the mercapto group-containing coupling agent conforming to Formula 1 below and having an aliphatic group containing a mercapto group in the G group: , formula 1; wherein R1-R3 are independently C1-C4 alkyl groups; the weight ratio of the epoxy group-containing coupling agent to the mercapto group-containing coupling agent is 1-3; the composition comprising an epoxy resin curing agent; the amount of the epoxy resin curing agent is 4-10% by weight of the epoxy resin.

2. The epoxy resin-based coating liquid composition according to claim 1, characterized by the solvent is 100-300 parts.

3. The epoxy resin-based coating liquid composition according to claim 1, characterized by the weight ratio of the graphite to the molybdenum disulfide is 0.3-0.

9.

4. The epoxy resin-based coating liquid composition according to claim 1, characterized by the epoxy resin is a bisphenol A type epoxy resin.

5. The epoxy resin-based coating liquid composition according to claim 4, characterized by the epoxy equivalent weight of the bisphenol A type epoxy resin is 170-4000 g / mol.

6. The epoxy resin-based coating liquid composition according to claim 1, characterized by the particle size of the molybdenum disulfide and the particle size of the graphite are independently 20 μm or less.

7. The epoxy resin-based coating liquid composition according to claim 1, characterized by the solvent is an organic solvent.

8. The epoxy resin-based coating liquid composition according to claim 7, characterized by the organic solvent comprises an aprotic organic solvent.

9. The epoxy-based coating liquid composition according to claim 8, wherein the aprotic organic solvent comprises an aprotic polar organic solvent.

10. The epoxy resin-based coating liquid composition according to Claim 1, characterized by the epoxy resin curing agent is a latent curing agent.

11. A method for preparing the epoxy-based coating liquid composition according to any one of claims 1-10, comprising: (1) mixing the epoxy resin and the solvent to obtain a material 1; (2) mixing the components other than the epoxy resin curing agent into the material 1 to obtain a material 2; (3) mixing the epoxy resin curing agent into the material 2.

12. Use of the epoxy-based coating liquid composition according to any one of claims 1-10 or obtained by the method according to claim 11 in the construction of a solid lubricating layer.

13. A method for constructing a solid lubricating layer, comprising: (i) obtaining a material substrate surface to be constructed; (ii) applying the coating liquid composition according to any one of claims 1-10 or obtained by the method according to claim 11 to the substrate surface; (iii) a curing step of the epoxy resin.

Images