CN116023838A - Low-friction wear-resistant epoxy resin-based composite coating and preparation method thereof - Google Patents
Low-friction wear-resistant epoxy resin-based composite coating and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 22
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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Abstract
The invention discloses a low-friction wear-resistant epoxy resin-based composite coating, which comprises the following components in percentage by mass: 6-12 parts of aluminum oxide; 5-15 parts of absolute ethyl alcohol; 0.1-1 part of polyvinylpyrrolidone; 4-10 parts of graphite powder; 5-15 parts of chopped carbon fiber material; 0.5 to 1.8 parts of defoaming agent; 95-105 parts of epoxy resin; 28-38 parts of epoxy curing agent, and a preparation method of the low-friction wear-resistant epoxy resin matrix composite coating, which is suitable for the technical field of solid lubricating materials, has the advantages of mild preparation conditions, simple process, good economy, easiness in preparing large-scale high-wear-resistant self-lubricating coatings and wide application range.
Description
Technical Field
The invention belongs to the technical field of solid lubricating materials, and particularly relates to a low-friction wear-resistant epoxy resin-based composite coating and a preparation method thereof.
Background
At present, the oil and gas pipeline is in underground for a long time, so that the outer wall of the pipeline is inevitably corroded by external air, soil, water and the like, and the inner wall of the pipeline is corroded by conveying media. When the surrounding corrosive medium contains SO 2 、CO 2 、H 2 S and Cl - When corrosive chemical oil well fluids such as ions are used, very severe chemical/electrochemical corrosion occurs. Meanwhile, the eccentric wear and corrosion of the oil delivery pipe can bring very serious harm to ground devices and pipelines and cause irreversible consequences, so that safety accidents such as production interruption, oil leakage, combustion, explosion and the like are caused, huge direct economic loss is caused, personal safety can be endangered, and the environment is polluted, and the method becomes an important difficult problem puzzles the oil and gas production.
In the prior art, CN103013284A discloses a drag-reducing wear-resistant corrosion-resistant water-based epoxy paint for a natural gas pipeline and a preparation method thereof, wherein iron oxide red, zinc phosphate, silicon micropowder and low-VOC water-based epoxy resin are mixed to prepare the paint with certain wear resistance and corrosion resistance; CN106543892a discloses an anti-corrosion and wear-resistant coating for pipes, which is prepared by mixing organic silicon resin and polyurethane as a matrix and adding aluminum oxide, copper dioxide and carbon black for addition modification, so that the pipe is not easy to scratch in use, and the service life of the coating is prolonged; CN107779043a discloses a special wear-resistant coating for a numerical control machine tool, which is prepared by mixing nanoscale aluminum oxide and nanoscale magnesium oxide and then carrying out nanoscale regulation and control in epoxy resin. However, the mechanical reinforcing phase and the friction lubricating phase in the coating additive in the above patent cannot exert good synergistic effect, but only prepare the wear-resistant and corrosion-resistant coating from a single angle of controlling the hardness or low friction coefficient of the coating, and the coating has the defects of lack of microcosmic regulation and control and systemicity, complicated operation, unobvious wear resistance and corrosion resistance, high cost, frequent accidents in use and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-friction wear-resistant epoxy resin matrix composite coating and a preparation method thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the low-friction wear-resistant epoxy resin-based composite coating comprises the following components in percentage by mass:
6-12 parts of aluminum oxide;
5-15 parts of absolute ethyl alcohol;
0.1-1 part of polyvinylpyrrolidone;
4-10 parts of graphite powder;
5-15 parts of chopped carbon fiber material;
0.5 to 1.8 parts of defoaming agent;
95-105 parts of epoxy resin;
28-38 parts of epoxy curing agent.
The preparation process of the low friction wear resistant epoxy resin based composite coating includes the following steps:
step 1: preparing pretreated nanoscale aluminum oxide;
step 2: preparing an aluminum oxide/epoxy resin dispersion liquid;
step 3: preparing the low-friction wear-resistant epoxy resin-based composite coating.
Preferably, in the step 1, preparing pretreated nanoscale aluminum oxide includes:
adding the formula amount of aluminum oxide into the formula amount of absolute ethanol solution, adding the formula amount of polyvinylpyrrolidone into the mixed solution, and carrying out ultrasonic treatment until the mixture is uniformly mixed to obtain a solution I.
Preferably, in the step 2, the preparation of the alumina/epoxy resin dispersion liquid comprises:
adding the formula amount of epoxy resin into the solution I, performing ultrasonic dispersion and stirring until the solution is uniform, heating and stirring in an oil bath to remove absolute ethyl alcohol to obtain a solution II, and grinding the solution II until particles in the solution are free from aggregation to obtain a solution III.
Preferably, in the step 3, the preparation of the low-friction wear-resistant epoxy resin-based composite coating includes: adding the formula amount of graphite powder and the formula amount of chopped carbon fiber material into the solution III, mechanically stirring uniformly to obtain a solution IV, adding a defoaming agent and an epoxy curing agent into the solution IV, stirring uniformly, and curing and forming to obtain the low-friction wear-resistant epoxy resin matrix composite coating.
Preferably, the solution I is a suspension of aluminum oxide in ethanol.
Preferably, the solution II is a suspension of aluminum oxide in an epoxy resin.
Preferably, the solution III is a suspension of aluminum oxide which has been well dispersed in an epoxy resin.
Preferably, the type of the defoaming agent is BYK-066N.
Preferably, the epoxy curing agent is an E51 bisphenol A curing agent.
Preferably, in the step 3, the curing and molding conditions are that the curing is carried out for 20 to 30 hours at the temperature of 23 to 27 ℃ and then for 3 to 5 hours at the temperature of 110 to 150 ℃.
Preferably, in the step 3, the thickness of the low-friction wear-resistant epoxy resin-based composite coating is 800-1000 um.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
according to the invention, through the mutual synergistic effect among the fillers, the aluminum oxide serves as a mechanical framework of the coating and a friction ball effect, namely, propagation and diffusion of cracks and sliding friction-rolling friction are prevented, and good overall stress performance of the coating is ensured; the chopped carbon fiber material can further enhance the die-increasing effect on the coating, but the abrasion of the coating can be adversely affected due to continuous abrasion, embrittlement and rupture of the fiber tip, so that uneven plow grooves of scratches are highlighted; therefore, the addition of the graphite powder can play a role in repairing and filling scratches, prevent fiber tips from being exposed on the upper surface of the coating, avoid serious abrasion, and in addition, the graphite can easily slide between the sheets due to weaker Van der Waals force between the sheets, so that the coating has the function of continuously reducing friction coefficient, the friction stabilization stage is prolonged, a good friction transfer film is formed between friction pairs, in addition, the addition amount of materials in the coating is small, the coating can be ensured to have outstanding antifriction and fatigue resistance and abrasion resistance, and the low addition content is realized and the epoxy resin composite coating is endowed with excellent antifriction and abrasion resistance.
The invention has the advantages of mild preparation conditions, simple process, good economy, easy preparation of large-scale high-wear-resistance self-lubricating coating and wide application range.
Drawings
FIG. 1 is a flow chart of a method for preparing a low-friction wear-resistant epoxy resin-based composite coating of the present invention;
FIG. 2 is a scanning electron microscope topography of a tensile fracture in example 7 of the present invention;
FIG. 3 is a scanning electron microscope topography of a tensile fracture in example 8 of the present invention;
FIG. 4 is a graph of the scratch surface topography at room temperature in the dry state of the coating in example 7 of the present invention;
FIG. 5 is a graph of the scratch surface topography at ambient dry state of the coating of example 8 of the present invention.
Detailed Description
The following is a detailed description of a low friction abrasion resistant epoxy resin based composite coating and a method for preparing the same in accordance with the present invention, in conjunction with figures 1-5. The low-friction wear-resistant epoxy resin-based composite coating and the preparation method thereof are not limited to the descriptions of the following examples.
Example 1:
the embodiment provides a specific implementation mode of a low-friction wear-resistant epoxy resin-based composite coating, which comprises the following components in percentage by mass:
6 parts of aluminum oxide;
5 parts of absolute ethyl alcohol;
0.1 part of polyvinylpyrrolidone;
4 parts of graphite powder;
5 parts of chopped carbon fiber material;
0.5 parts of a defoaming agent;
95 parts of epoxy resin;
28 parts of epoxy curing agent.
Example 2:
the embodiment provides a specific implementation mode of a low-friction wear-resistant epoxy resin-based composite coating, which comprises the following components in percentage by mass:
9 parts of aluminum oxide;
10 parts of absolute ethyl alcohol;
0.5 parts of polyvinylpyrrolidone;
7 parts of graphite powder;
10 parts of chopped carbon fiber material;
1.1 parts of a defoaming agent;
100 parts of epoxy resin;
33 parts of epoxy curing agent.
Example 3:
the embodiment provides a specific implementation mode of a low-friction wear-resistant epoxy resin-based composite coating, which comprises the following components in percentage by mass:
12 parts of aluminum oxide;
15 parts of absolute ethyl alcohol;
1 part of polyvinylpyrrolidone;
10 parts of graphite powder;
15 parts of chopped carbon fiber material;
1.8 parts of a defoaming agent;
105 parts of epoxy resin;
38 parts of epoxy curing agent.
Example 4:
the embodiment provides a specific implementation mode of a preparation method of a low-friction wear-resistant epoxy resin-based composite coating, which is shown in fig. 1 and comprises the following steps:
step 1: preparing pretreated nanoscale aluminum oxide;
step 2: preparing an aluminum oxide/epoxy resin dispersion liquid;
step 3: preparing the low-friction wear-resistant epoxy resin-based composite coating.
Further, in step 1, preparing pretreated nanoscale aluminum oxide, including:
adding the formula amount of aluminum oxide into the formula amount of absolute ethanol solution, adding the formula amount of polyvinylpyrrolidone into the mixed solution, and carrying out ultrasonic treatment until the mixture is uniformly mixed to obtain a solution I.
Further, in step 2, a alumina/epoxy resin dispersion is prepared, comprising:
adding the formula amount of epoxy resin into the solution I, performing ultrasonic dispersion and stirring until the solution is uniform, heating and stirring in an oil bath to remove absolute ethyl alcohol to obtain a solution II, and grinding the solution II until particles in the solution are free from aggregation to obtain a solution III.
Further, in step 3, a low-friction wear-resistant epoxy resin-based composite coating is prepared, including: adding the formula amount of graphite powder and the formula amount of chopped carbon fiber material into the solution III, mechanically stirring uniformly to obtain a solution IV, adding a defoaming agent and an epoxy curing agent into the solution IV, stirring uniformly, and curing and forming to obtain the low-friction wear-resistant epoxy resin matrix composite coating.
Further, solution I is a suspension of aluminum oxide in ethanol.
Further, solution II is a suspension of aluminum oxide in an epoxy resin.
Further, solution III is a well dispersed suspension of aluminum oxide in epoxy resin.
Further, the type of the defoaming agent is BYK-066N.
Further, the epoxy curing agent is an E51 bisphenol A type curing agent.
In step 3, the curing and molding conditions are that the temperature is 23 ℃ for 20 hours, and then 110 ℃ for 3 hours.
Further, in the step 3, the thickness of the low-friction wear-resistant epoxy resin-based composite coating is 800um.
Example 5:
the embodiment provides a specific implementation mode of a preparation method of a low-friction wear-resistant epoxy resin-based composite coating, as shown in fig. 1, and other steps are approximately the same as those of the embodiment 4; in the step 3, the curing and molding conditions are that the curing is carried out for 25 hours at 25 ℃ and then the curing is carried out for 4 hours at 130 ℃.
Further, in the step 3, the thickness of the low-friction wear-resistant epoxy resin-based composite coating is 900um.
Example 6:
the embodiment provides a specific implementation mode of a preparation method of a low-friction wear-resistant epoxy resin-based composite coating, as shown in fig. 1, and other steps are approximately the same as those of the embodiment 4; in the step 3, the curing and molding conditions are that the curing is carried out for 30 hours at 27 ℃ and then the curing is carried out for 5 hours at 150 ℃.
Further, in the step 3, the thickness of the low-friction wear-resistant epoxy resin-based composite coating is 1000um.
Example 7
The embodiment provides a specific implementation mode of a preparation method of a low-friction wear-resistant epoxy resin-based composite coating, which is shown in figures 1-5 and comprises the following steps:
(1) Firstly, preparing 13g of nano aluminum oxide into absolute ethyl alcohol, adding 1% of polyvinylpyrrolidone by mass percent, adding 100g of epoxy resin by ultrasonic stirring, heating for 4 hours in an 80 ℃ water bath, naturally cooling, grinding for 5 periods by three rollers at a rotating speed of 5:3:1, sequentially adding 12g of graphite, 16g of chopped carbon fiber material, 0.5g of a defoaming agent and 34.5g of a curing agent, rotating for 5 minutes at a spin speed of 3000r/min of a spin coater, finally, casting and molding the obtained solution, uniformly coating on the surface of a substrate by a brush coating method to obtain a coating A, curing for 3 hours at 100 ℃ and using for tensile test and friction and wear test.
(2) FIG. 2 is a morphology diagram of a field emission scanning electron microscope of a tensile fracture of a composite coating, and as seen from the picture, a nanocomposite is successfully prepared, aluminum oxide is uniformly distributed, and a short-cut carbon fiber material is not pulled out; FIG. 4 is a topography of the scratched surface at room temperature in a dry state, where a uniform and dense lubricating transfer film has been formed.
Example 8
The embodiment provides a specific implementation mode of a preparation method of a low-friction wear-resistant epoxy resin-based composite coating, which is shown in figures 1-5 and comprises the following steps:
100g of epoxy resin, 0.5g of defoaming agent and 34.5g of curing agent are mixed together, the mixture is rotated for 5 minutes under a spin-coater with the rotating speed of 3000r/min, and the mixture is uniformly coated on the surface of a substrate by a brush coating method to obtain a coating B, and the coating B is cured for 3 hours at 100 ℃. FIG. 3 is a graphical representation of the stretched fracture morphology in this example, the fracture being smooth and brittle fracture has occurred; FIG. 5 is a topography of the scratched surface, the coating has been subject to significant crack fracture, and the service requirements cannot be met continuously.
Table 1 shows the friction coefficient and wear rate of the two lubricating coatings A and B prepared in examples 7 and 8, and it can be seen from the table that the friction coefficient and wear rate of the nano-material modified epoxy lubricating composite coating are far lower than those of the unmodified epoxy resin coating, and the Vickers hardness of the A coating is 41.2% higher than that of the B coating, namely, the nano-alumina/graphite powder/chopped carbon fiber material can endow the epoxy resin coating with excellent antifriction and wear resistance and high hardness properties at a low addition amount.
Table 1.
Principle of:
the nano-scale aluminum oxide has many advantages of high surface activity, large comparison area, low bulk density, easy dispersion, stable crystalline phase, good dimensional stability, good compatibility with various materials, high strength and hardness, plays a role in bearing and wear resistance, and is widely used for mechanical reinforcement and tribology modification of materials.
The graphite lubricating powder is a natural lubricating agent, has good self-lubricating property, does not influence the lubricating effect at high temperature and does not generate pungent smell; meanwhile, the elasticity of the graphite powder is good, so that the capability of buffering thermal stress is strong, and the thermal stability is good.
The carbon fiber has the mechanical reinforcing effect of light weight, high strength and high modulus, and the abrasion resistance of the carbon fiber is improved by improving the hardness of the coating.
The invention provides a nano modified epoxy resin self-lubricating composite coating composed of a mechanical reinforcing phase nano aluminum oxide, a chopped carbon fiber material and wear-resistant lubricating phase graphite powder, wherein the aluminum oxide serves as a coating mechanical skeleton and a friction ball effect through the mutual synergistic effect among fillers, namely, propagation and diffusion of cracks and sliding friction-to-rolling friction are prevented, and good stress overall performance of the coating is ensured; the chopped carbon fiber material can further enhance the die-increasing effect on the coating, but the abrasion of the coating can be adversely affected due to continuous abrasion, embrittlement and breakage of the fiber tip, so that uneven plow grooves of scratches are highlighted.
Therefore, the addition of the graphite powder can play a role in repairing and filling scratches, prevent fiber tips from being exposed on the upper surface of the coating, avoid serious abrasion, and in addition, the graphite can easily slide between the sheets due to weaker van der Waals force between the sheets, so that the coating is ensured to have the function of continuously reducing friction coefficient, the friction stabilization stage is prolonged, and a good friction transfer film is formed between friction pairs. In addition, the addition amount of the materials in the coating is small, and the coating can be ensured to have outstanding antifriction, fatigue resistance and abrasion resistance. The low addition content is realized, and the epoxy resin composite coating is endowed with excellent antifriction and antiwear performance (the generation of a transfer film and the damage state of scratches can be verified through a microscopic image).
In conclusion, the preparation method has the advantages of mild preparation conditions, simple process, good economy, easiness in preparing large-scale high-wear-resistance self-lubricating coating and wide application range.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (12)
1. The low-friction wear-resistant epoxy resin-based composite coating is characterized by comprising the following components in percentage by mass:
6-12 parts of aluminum oxide;
5-15 parts of absolute ethyl alcohol;
0.1-1 part of polyvinylpyrrolidone;
4-10 parts of graphite powder;
5-15 parts of chopped carbon fiber material;
0.5 to 1.8 parts of defoaming agent;
95-105 parts of epoxy resin;
28-38 parts of epoxy curing agent.
2. The preparation method of the low-friction wear-resistant epoxy resin-based composite coating is characterized by comprising the following steps of:
step 1: preparing pretreated nanoscale aluminum oxide;
step 2: preparing an aluminum oxide/epoxy resin dispersion liquid;
step 3: preparing the low-friction wear-resistant epoxy resin-based composite coating.
3. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating according to claim 2, wherein in the step 1, the preparation of the pretreated nanoscale aluminum oxide comprises the following steps:
adding the formula amount of aluminum oxide into the formula amount of absolute ethanol solution, adding the formula amount of polyvinylpyrrolidone into the mixed solution, and carrying out ultrasonic treatment until the mixture is uniformly mixed to obtain a solution I.
4. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating according to claim 2, wherein in the step 2, preparing the aluminum oxide/epoxy resin dispersion liquid comprises the following steps:
adding the formula amount of epoxy resin into the solution I, performing ultrasonic dispersion and stirring until the solution is uniform, heating and stirring in an oil bath to remove absolute ethyl alcohol to obtain a solution II, and grinding the solution II until particles in the solution are free from aggregation to obtain a solution III.
5. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating according to claim 2, wherein in the step 3, the method for preparing the low-friction wear-resistant epoxy resin-based composite coating comprises the following steps: adding the formula amount of graphite powder and the formula amount of chopped carbon fiber material into the solution III, mechanically stirring uniformly to obtain a solution IV, adding a defoaming agent and an epoxy curing agent into the solution IV, stirring uniformly, and curing and forming to obtain the low-friction wear-resistant epoxy resin matrix composite coating.
6. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating according to claim 3, which is characterized by comprising the following steps: the solution I is a suspension of aluminum oxide in ethanol.
7. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating, as claimed in claim 4, is characterized in that: the solution II is a suspension of aluminum oxide in an epoxy resin.
8. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating according to claim 5, which is characterized by comprising the following steps: the solution III is an aluminum oxide suspension which has been well dispersed in an epoxy resin.
9. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating according to claim 5, which is characterized by comprising the following steps: the type of the defoaming agent is BYK-066N.
10. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating according to claim 5, which is characterized by comprising the following steps: the epoxy curing agent is E51 bisphenol A type curing agent.
11. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating according to claim 5, which is characterized by comprising the following steps: in the step 3, the curing and molding conditions are that the temperature is between 23 and 27 ℃ for 20 to 30 hours, and the temperature is between 110 and 150 ℃ for 3 to 5 hours.
12. The method for preparing the low-friction wear-resistant epoxy resin-based composite coating according to claim 5, which is characterized by comprising the following steps: in the step 3, the thickness of the low-friction wear-resistant epoxy resin matrix composite coating is 800-1000 um.
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| CN116875150A (en) * | 2023-08-10 | 2023-10-13 | 江苏云湖新材料科技有限公司 | Waterborne epoxy internal drag reduction coating and preparation method thereof |
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| CN116875150A (en) * | 2023-08-10 | 2023-10-13 | 江苏云湖新材料科技有限公司 | Waterborne epoxy internal drag reduction coating and preparation method thereof |
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