Carbon dot-engineering plastic composite coating for optical temperature measurement and preparation method thereof

Abstract

The invention discloses a carbon dot-engineering plastic composite coating for optical temperature measurement and a preparation method thereof. The carbon dot-engineering plastic composite coating comprises the following components in parts by mass: 1-20 parts of carbon dots; and 1-3 parts of engineering plastic. The preparation method comprises the following steps: adding deionized water into a citric acid raw material and an arginine raw material to obtain a solution A, adding formic acid, adjusting the pH value of the solution, adding the solution into a reaction kettle, placing the reaction kettle in a drying oven, heating to obtain a solution B, performing centrifugal purification and drying to obtain an oily substance C, mixing the oily substance C with an engineering plastic solution to obtain a mixture D, pouring the mixture D into a spray cup, spraying the mixture D on a substrate, and performing drying to obtain a finished product. And putting into a drying oven for firing. The composite coating disclosed by the invention not only can be used as a luminescent material to be widely applied to the fields of frictional wear, non-contact temperature measurement, equipment surfaces and the like, but also can be used for measuring the temperature of the surface of mechanical equipment through the composite coating, so that the use efficiency of the equipment is improved, the service life of the equipment is prolonged, and the use safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite coatings, and in particular to a carbon dot-engineering plastic composite coating for optical temperature measurement and a preparation method thereof. Background Art

[0002] Heating and wear at the friction interface in fluid machinery are common problems. These problems not only affect the efficiency and life of the equipment, but can also lead to more serious failures. The following are some of the problems caused by heating and wear: 1. Reduced efficiency: Since heat increases energy loss, it will directly lead to a decrease in the overall efficiency of the mechanical system. For example, in wind turbines or hydro turbines, excessive wear of bearings or gearboxes will lead to reduced transmission efficiency.

[0003] 2. Material fatigue and damage: High temperature and continuous friction will accelerate material fatigue, causing early failure of components.

[0004] 3. Lubrication failure: In many machines, such as engines and compressors, lubricants are used to reduce friction between moving parts. However, if the temperature is too high, the lubricating oil may degrade or evaporate, losing its protective effect and exacerbating wear.

[0005] 4. Unstable performance: Wear will cause the gap between mechanical parts to increase, which will affect the working accuracy and stability of the machine. In precision machining equipment, these changes will lead to a decline in product quality and increased maintenance costs. Frequent wear requires regular replacement of parts, which not only increases maintenance costs, but also affects production efficiency due to extended downtime.

[0006] 5. Safety hazards: In extreme cases, severe wear and overheating may lead to mechanical failure and thus accidents.

[0007] 6. Facing the challenge of difficult monitoring: During operation, the friction interface inside the fluid machinery is usually closed, and the wear cannot be directly observed by the naked eye. The degree of wear cannot be monitored in real time, which may lead to sudden equipment failure or unplanned downtime. Summary of the Invention

[0008] The purpose of the present invention is to address the deficiencies in the prior art and provide a technical solution for a carbon dot-engineering plastic composite coating for optical temperature measurement and a preparation method thereof. The composite coating can not only be widely used as a luminescent material in the fields of friction and wear, non-contact temperature measurement, equipment surface, etc., but also the composite coating can be used to measure the temperature of the surface of mechanical equipment, thereby improving the efficiency and service life of the equipment and improving the safety of use. The preparation method has simple steps, which can not only reduce the production cost of the composite coating, but also lubricate the friction pairs of the mechanical equipment, which is beneficial to extending the service life of the mechanical equipment. At the same time, it can realize temperature visualization of the mechanical equipment and improve safety of use.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions: A carbon dot-engineering plastic composite coating for optical temperature measurement, characterized by comprising the following parts by mass: 1 to 20 parts of carbon dots; 1 to 3 parts of engineering plastics.

[0010] This composite coating can not only be used as a luminescent material in a wide range of applications such as friction and wear, non-contact temperature measurement, and equipment surface, but can also be used to measure the temperature of the surface of mechanical equipment, thereby improving the efficiency and service life of the equipment and enhancing its safety.

[0011] Furthermore, the chemical formula of carbon dots is .

[0012] Furthermore, carbon dots are composed of dispersed spherical carbon particles.

[0013] Furthermore, spherical carbon particles were synthesized from citric acid and arginine.

[0014] Furthermore, the engineering plastic is at least one of polyphenylene sulfide PPS, polyimide PI, polyetheretherketone PEEK, liquid crystal polymer LCP or polysulfone PSF.

[0015] The method for preparing a carbon dot-engineering plastic composite coating for optical temperature measurement is characterized by comprising the following steps: (a) Weighing citric acid and arginine using a balance, and then adding deionized water to obtain solution A; (b) adding formic acid to solution A to adjust the pH of the solution to 7; (c) adding solution A to a reaction kettle and heating the reaction kettle in a drying oven at 150-200° C. for 12-72 hours, and then removing the reaction kettle to obtain solution B; (d) Transferring solution B to a centrifuge, purifying and drying the solution by centrifugation to obtain an oily substance C; (e) mixing the obtained oily substance C with the engineering plastic solution to obtain a mixture D, and stirring the mixture for 2 h; (f) Pour mixture D into a spray cup, spray it on the substrate, and place it in an oven for firing.

[0016] The preparation method has simple steps and can not only reduce the production cost of the composite coating, but also lubricate the friction pairs of mechanical equipment, which is beneficial to extending the service life of the mechanical equipment. At the same time, it can realize temperature visualization of the mechanical equipment and improve the safety of use.

[0017] Furthermore, the molar mass ratio of citric acid to arginine in step (a) is 1:5.

[0018] Furthermore, the drying oven temperature in step (c) is 180° C., and the heating time is 12 to 24 hours.

[0019] Furthermore, the centrifugal speed of the centrifuge in step (d) is 1000-20000 r / min, and the centrifugal time is 10-30 min.

[0020] Furthermore, the oven temperature in step (f) is 300° C. to 500° C., and the heating time is 2 to 8 hours.

[0021] The present invention has the following beneficial effects due to the adoption of the above technical solution: The composite coating of the present invention can not only be widely used as a luminescent material in the fields of friction and wear, non-contact temperature measurement, equipment surface, etc., but also the composite coating can be used to measure the temperature of the surface of mechanical equipment, thereby improving the efficiency and service life of the equipment and improving its safety.

[0022] The preparation method of the present invention has simple steps, which can not only reduce the production cost of the composite coating, but also lubricate the friction pairs of mechanical equipment, which is beneficial to extending the service life of the mechanical equipment. At the same time, it can realize temperature visualization of the mechanical equipment and improve the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 TEM images of carbon dots taken in a carbon dot-engineering plastic composite coating for optical temperature measurement and a preparation method thereof according to the present invention; Figure 2 This is a lattice spacing diagram for analyzing carbon dots in the present invention; Figure 3 is the fluorescence lifetime diagram of the composite coating of the present invention; Figure 4 This is a comparison chart of the friction coefficients of the composite coating and the substrate core PEEK coating in the present invention; Figure 5is a temperature performance curve diagram of the composite coating of the present invention; Figure 6 This is a temperature performance curve diagram of the composite coating of Example 4 of the present invention; Figure 7 This is a graph showing infrared test results of the composite coating and PEEK in the present invention; Figure 8 Flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," and so on in the description and claims of the present invention and the accompanying drawings are used to distinguish similar items and are not necessarily used to describe a specific order or precedence. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0027] like Figures 1 to 5 、 Figure 7 As shown, a carbon dot-engineering plastic composite coating for optical temperature measurement of the present invention includes the following parts by weight: 1 to 20 parts of carbon dots; 1 to 3 parts of engineering plastics.

[0028] The chemical formula of carbon dots is .

[0029] Carbon dots are composed of dispersed spherical carbon particles.

[0030] Spherical carbon particles were synthesized from citric acid and arginine.

[0031] The engineering plastic is at least one of polyphenylene sulfide (PPS), polyimide (PI), polyetheretherketone (PEEK), liquid crystal polymer (LCP) or polysulfone (PSF).

[0032] This composite coating can not only be used as a luminescent material in a wide range of applications such as friction and wear, non-contact temperature measurement, and equipment surface, but can also be used to measure the temperature of the surface of mechanical equipment, thereby improving the efficiency and service life of the equipment and enhancing its safety.

[0033] like Figure 8 As shown in FIG, a method for preparing a carbon dot-engineering plastic composite coating for optical temperature measurement according to the present invention comprises the following steps: (a) Using a balance, weigh citric acid and arginine and add deionized water to obtain solution A. The molar ratio of citric acid to arginine is 1:5.

[0034] (b) adding formic acid to solution A to adjust the pH of the solution to 7; (c) adding solution A to a reaction kettle and heating the reaction kettle in a drying oven at 150-200° C. for 12-72 hours, and then removing the reaction kettle to obtain solution B. Preferably, the drying oven temperature is 180° C. and the heating time is 12-24 hours.

[0035] (d) Transferring solution B to a centrifuge, purifying and drying the solution by centrifugation to obtain an oily substance C; the centrifugal speed of the centrifuge is 1000 to 20,000 rpm, and the centrifugation time is 10 to 30 min.

[0036] (e) mixing the obtained oily substance C with the engineering plastic solution to obtain a mixture D, and stirring the mixture for 2 h; (f) Pour mixture D into a spray cup, spray it onto the substrate, and then place it in an oven for firing at a temperature of 300°C to 500°C for 2 to 8 hours.

[0037] The preparation method has simple steps and can not only reduce the production cost of the composite coating, but also lubricate the friction pairs of mechanical equipment, which is beneficial to extending the service life of the mechanical equipment. At the same time, it can realize temperature visualization of the mechanical equipment and improve the safety of use.

[0038] The engineering plastic of the present invention takes polyetheretherketone (PEEK) as an example.

[0039] Example 1 A 30x30mm 304 stainless steel substrate, commonly used for friction pairs, was ultrasonically cleaned for 10-15 minutes. Sandblasting was performed using 100-mesh corundum at a pressure of 0.4-0.45 MPa, with the nozzle distance between the workpiece and the sandblasting nozzle maintained between 150 and 200 mm. After sandblasting, ultrasonic cleaning was performed for 10-15 minutes. The substrate was then dried in an oven (150-180°C) for 30 minutes.

[0040] 10 ml of a water-based PEEK dispersion was stirred at 600 rpm for 10 minutes using a magnetic stirrer. 100 mg of CDs was added and stirred at 600 rpm for 30 minutes to ensure uniform dispersion of the CDs in the water-based PEEK dispersion. The mixture was transferred to a spray cup and sprayed onto a pretreated 304 stainless steel substrate using a spray gun. The spray gun's operating pressure was set to 0.3-0.4 MPa and the spray distance was maintained at 100 to 150 mm. The spraying was repeated three times to form a uniform coating. Finally, the 304 stainless steel substrate coated with the CDs and PEEK composite coating was placed back into the oven and dried at 150°C for 30 minutes. The temperature was then raised to 425°C for 10 minutes to promote coating curing and optimize its properties. UV light irradiation revealed green fluorescence.

[0041] Example 2 Select a 30x30mm 304 stainless steel substrate, commonly used for friction pairs. Ultrasonic cleaning is performed for 10-15 minutes. Sandblasting is performed using 100-mesh corundum at a pressure of 0.4-0.45 MPa. The distance between the nozzle and the workpiece is maintained between 150 mm and 200 mm. After sandblasting, ultrasonic cleaning is performed for 10-15 minutes. Dry in an oven (150-180 degrees Celsius) for 30 minutes.

[0042] 10 ml of a water-based PEEK dispersion was stirred at 600 rpm for 10 minutes using a magnetic stirrer. 200 mg of CDs was added and stirred at 600 rpm for 30 minutes to ensure uniform dispersion of the CDs in the water-based PEEK dispersion. The mixture was transferred to a spray cup and sprayed onto a pretreated 304 stainless steel substrate using a spray gun. The spray gun's operating pressure was set to 0.3-0.4 MPa and the spray distance was maintained at 100 to 150 mm. The spraying was repeated three times to form a uniform coating. Finally, the 304 stainless steel substrate coated with the CDs and PEEK composite coating was placed back into the oven and dried at 150°C for 30 minutes. The temperature was then raised to 425°C for 10 minutes to promote coating curing and optimize its properties. UV light irradiation revealed green fluorescence.

[0043] Example 3 Select a 30x30mm 304 stainless steel substrate, commonly used for friction pairs. Ultrasonic cleaning is performed for 10-15 minutes. Sandblasting is performed using 100-mesh corundum at a pressure of 0.4-0.45 MPa. The distance between the nozzle and the workpiece is maintained between 150 mm and 200 mm. After sandblasting, ultrasonic cleaning is performed for 10-15 minutes. Dry in an oven (150-180 degrees Celsius) for 30 minutes.

[0044] 10 ml of a water-based PEEK dispersion was stirred at 600 rpm for 10 minutes using a magnetic stirrer. 300 mg of CDs was added and stirred at 600 rpm for another 30 minutes to ensure uniform dispersion of the CDs in the water-based PEEK dispersion. The mixture was transferred to a spray cup and sprayed onto a pretreated 304 stainless steel substrate using a spray gun. The spray gun's operating pressure was set to 0.3-0.4 MPa and the spray distance was maintained at 100 to 150 mm. The spraying was repeated three times to form a uniform coating. Finally, the 304 stainless steel substrate coated with the CDs and PEEK composite coating was placed back into the oven and dried at 150°C for 30 minutes. The temperature was then raised to 425°C for 10 minutes to promote coating curing and optimize its properties. UV light irradiation revealed green fluorescence.

[0045] Example 4 Select a 30x30mm 304 stainless steel substrate, commonly used for friction pairs. Ultrasonic cleaning is performed for 10-15 minutes. Sandblasting is performed using 100-mesh corundum at a pressure of 0.4-0.45 MPa. The distance between the nozzle and the workpiece is maintained between 150 mm and 200 mm. After sandblasting, ultrasonic cleaning is performed for 10-15 minutes. Dry in an oven (150-180 degrees Celsius) for 30 minutes.

[0046] Take 10 ml of water-based PEEK dispersion and stir it with a magnetic stirrer at 600 rpm for 10 minutes. Add 400 mg of CDs and stir it with a magnetic stirrer at 600 rpm for 30 minutes to ensure that the CDs are evenly dispersed in the water-based PEEK dispersion. Transfer the mixed solution to a spray cup and spray it on the pretreated 304 stainless steel substrate with a spray gun. The working pressure of the spray gun is set to 0.3-0.4 MPa, the spraying distance is kept at 100 to 150 mm, and the spraying is repeated three times to form a uniform coating. Finally, the 304 stainless steel substrate sprayed with the CDs and PEEK composite coating is placed back into the oven, first dried at 150 degrees Celsius for 30 minutes, and then heated to 425 degrees Celsius for 10 minutes to promote the curing of the coating and optimize its performance. It is irradiated with ultraviolet light to exhibit green fluorescence. The temperature performance curve of the composite coating is shown in the figure below. Figure 6 shown.

[0047] Example 5 Select a 30x30mm 304 stainless steel substrate, commonly used for friction pairs. Ultrasonic cleaning is performed for 10-15 minutes. Sandblasting is performed using 100-mesh corundum at a pressure of 0.4-0.45 MPa. The distance between the nozzle and the workpiece is maintained between 150 mm and 200 mm. After sandblasting, ultrasonic cleaning is performed for 10-15 minutes. Dry in an oven (150-180 degrees Celsius) for 30 minutes.

[0048] Take 10ml of water-based PEEK dispersion and stir it with a magnetic stirrer at 600 rpm for 10 minutes. Add 500mg of CDs and stir it with a magnetic stirrer at 600 rpm for 30 minutes to ensure that the CDs are evenly dispersed in the water-based PEEK dispersion. Transfer the mixture to a spray cup and spray it on a pretreated 304 stainless steel substrate using a spray gun. The working pressure of the spray gun is set to 0.3-0.4 MPa, and the spraying distance is maintained at 100 to 150 mm. Repeat the spraying three times to form a uniform coating. Finally, the 304 stainless steel substrate sprayed with the CDs and PEEK composite coating is placed back into the oven, first dried at 150 degrees Celsius for 30 minutes, and then heated to 425 degrees Celsius for 10 minutes to promote the curing of the coating and optimize its performance. It is irradiated with ultraviolet light to emit green fluorescence.

[0049] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements, or modifications based on the present invention to achieve substantially the same technical effects are all within the scope of protection of the present invention.

Claims

1. A carbon dot-engineering plastic composite coating for optical temperature measurement, characterized in that Includes the following parts by mass: 1 to 20 parts of carbon dots; 1 to 3 parts of engineering plastics.

2. The carbon dot-engineering plastic composite coating for optical temperature measurement according to claim 1, characterized in that: The chemical formula of the carbon dots is 。 3. The carbon dot-engineering plastic composite coating for optical temperature measurement according to claim 1, characterized in that: The carbon dots are composed of dispersed spherical carbon particles.

4. The carbon dot-engineering plastic composite coating for optical temperature measurement according to claim 3, characterized in that: The spherical carbon particles are synthesized from citric acid and arginine.

5. The carbon dot-engineering plastic composite coating for optical temperature measurement according to claim 1, characterized in that: The engineering plastic is at least one of polyphenylene sulfide (PPS), polyimide (PI), polyetheretherketone (PEEK), liquid crystal polymer (LCP) or polysulfone (PSF).

6. A method for preparing a carbon dot-engineering plastic composite coating for optical temperature measurement according to any one of claims 1 to 5, characterized in that The steps include: (a) Weighing citric acid and arginine using a balance, and then adding deionized water to obtain solution A; (b) adding formic acid to solution A to adjust the pH of the solution to 7; (c) adding solution A to a reaction kettle and heating the reaction kettle in a drying oven at 150-200° C. for 12-72 hours, and then removing the reaction kettle to obtain solution B; (d) Transferring solution B to a centrifuge, purifying and drying the solution by centrifugation to obtain an oily substance C; (e) mixing the obtained oily substance C with the engineering plastic solution to obtain a mixture D, and stirring the mixture for 2 h; (f) Pour mixture D into a spray cup, spray it on the substrate, and place it in an oven for firing.

7. The method for preparing a carbon dot-engineering plastic composite coating for optical temperature measurement according to claim 6, characterized in that: The molar mass ratio of the citric acid to the arginine in step (a) is 1:

5.

8. The method for preparing a carbon dot-engineering plastic composite coating for optical temperature measurement according to claim 6, characterized in that: The drying oven temperature in step (c) is 180° C., and the heating time is 12 to 24 hours.

9. The method for preparing a carbon dot-engineering plastic composite coating for optical temperature measurement according to claim 6, characterized in that: The centrifugal speed of the centrifuge in step (d) is 1000-20000 r / min, and the centrifugal time is 10-30 min.

10. The method for preparing a carbon dot-engineering plastic composite coating for optical temperature measurement according to claim 6, characterized in that: The oven temperature in step (f) is 300° C. to 500° C., and the heating time is 2 to 8 hours.

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