A frictional luminescence functional coating and its application in mechanical seal micro-leakage monitoring

Abstract

This invention belongs to the field of mechanical seal leak detection technology, specifically relating to a triboluminescent functional coating and its application in monitoring micro-leakage in mechanical seals. The triboluminescent functional coating provided by this invention comprises: 40-70 parts of adhesive resin, 5-40 parts of a first triboluminescent filler, 4-10 parts of a second triboluminescent filler, 0-10 parts of solid lubricating filler, 0.02-0.2 parts of wetting and dispersing agent, and 0.02-0.2 parts of leveling agent. The coating and its composition are simple, low-cost, and have good environmental adaptability, enabling real-time monitoring. It also possesses two response mechanisms: leakage-induced luminescence quenching and destruction-induced bimodal luminescence, achieving dual monitoring of the coating's own health status and the seal leakage status. It is particularly suitable for real-time monitoring of micro-leakage in spacecraft mechanical seals and can also be used for leak detection in mechanical seals of various rotating machinery (such as pumps and compressors).

Description

Technical Field

[0001] This invention belongs to the field of mechanical seal leak detection technology, specifically relating to a triboluminescent coating and its application in monitoring micro-leakage in mechanical seals. Background Technology

[0002] Mechanical seals are core sealing components in various rotating machinery such as spacecraft, pumps, and compressors. They are primarily used to prevent the leakage of fluid media, ensuring the sealing and stability of the entire machine. Aerospace equipment operates in extreme environments with extremely high reliability requirements, and the permissible leakage of its mechanical seal system is strictly limited to the micro-leakage level. If an abnormal micro-leak occurs in the sealing structure and cannot be detected and addressed in a timely manner, it can easily lead to equipment failure, pipeline media loss, and in severe cases, trigger major aerospace safety accidents, directly restricting the safety, stability, and service life of spacecraft in orbit. Therefore, achieving high-precision, long-term, and real-time monitoring of mechanical seal micro-leakage is a key technology for ensuring the reliable operation of aerospace and various rotating machinery.

[0003] Currently, various mechanical seal leakage detection technologies have been developed in the industry, which can be broadly categorized into offline detection technologies and online monitoring technologies. These technologies can detect and determine the state of seal leakage to a certain extent. Conventional leak detection methods mainly rely on principles such as electrical detection, gas sensing, pressure monitoring, and visual inspection to build detection systems, and are widely used in industrial equipment seal leak detection scenarios. To adapt to the micro-leakage monitoring needs of high-end equipment, especially spacecraft, existing technologies are continuously iterating and improving towards equipment miniaturization, detection algorithm optimization, and increased sensitivity to compensate for the shortcomings of traditional detection methods.

[0004] However, existing mechanical seal micro-leakage monitoring technologies still suffer from numerous insurmountable technical shortcomings, failing to meet the stringent requirements of long-term real-time on-orbit monitoring of spacecraft and high-precision leak detection in industrial equipment. Firstly, traditional leak detection systems have complex overall structures, numerous supporting components, large equipment size, high operating power consumption, and high manufacturing and application costs, making them unsuitable for the lightweight, low-power on-orbit requirements of spacecraft. Secondly, most existing high-sensitivity micro-leakage detection technologies are limited to offline ground-based detection modes, only allowing for spot checks when the equipment is shut down. They cannot achieve dynamic real-time monitoring throughout the entire equipment operation process, resulting in extremely poor detection timeliness and continuity, and failing to promptly capture transient and intermittent micro-leakage faults.

[0005] Meanwhile, existing online monitoring technologies have poor environmental adaptability and are highly susceptible to interference from the extreme space environment, such as alternating high and low temperatures, vacuum, and radiation. This leads to signal distortion, a significant decrease in detection accuracy, and insufficient monitoring stability and reliability. More importantly, current mainstream leak detection technologies can only identify the leakage status of the sealing medium and cannot simultaneously monitor the wear, damage, aging, and other health conditions of the mechanical seal coating itself. It is difficult to distinguish whether the abnormal signal is caused by the leakage of the medium or the failure of the sealing coating itself, making fault tracing difficult, monitoring accuracy low, and failing to achieve comprehensive status monitoring of the sealing system.

[0006] In summary, existing mechanical seal micro-leakage monitoring technologies generally suffer from technical shortcomings such as system complexity, large size and power consumption, high cost, weak environmental adaptability, inability to conduct long-term on-orbit real-time monitoring, single monitoring dimensions, and inability to simultaneously identify coating health status and seal leakage status. These shortcomings make it difficult to adapt to the operational condition monitoring needs of spacecraft and high-precision rotating machinery, and greatly limit the safe operation and long-term service of sealing systems in high-end equipment. Summary of the Invention

[0007] The purpose of this invention is to provide a triboluminescent coating and its application in monitoring micro-leakage in mechanical seals. The coating and its application in monitoring micro-leakage in mechanical seals are simple in composition and structure, low in cost, and have good environmental adaptability. They can achieve real-time monitoring. They also have two response mechanisms: leakage-triggered luminescence quenching and coating damage-triggered bi-peak luminescence. This allows for simultaneous monitoring of both the seal leakage status and the coating's own health status. They are particularly suitable for real-time monitoring of micro-leakage in spacecraft mechanical seals and can also be used for leak detection in mechanical seals of various rotating machinery (such as pumps and compressors).

[0008] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a triboluminescent functional coating, comprising the following components in parts by weight: 40-70 parts of adhesive resin, 5-40 parts of a first triboluminescent filler, 4-10 parts of a second triboluminescent filler, 0-10 parts of a solid lubricating filler, 0.02-0.2 parts of a wetting and dispersing agent, and 0.02-0.2 parts of a leveling agent; the first triboluminescent filler is a triboluminescent material dispersed in the adhesive resin matrix that generates a first characteristic emission peak under normal friction conditions of the coating formed by the triboluminescent functional coating; the second triboluminescent filler is a triboluminescent material dispersed in the adhesive resin matrix that generates a second characteristic emission peak, distinct from the first characteristic emission peak, when the surface of the coating formed by the triboluminescent functional coating is worn or damaged.

[0009] Preferably, the first triboluminescent filler comprises ZnS:Cu or CaF2:Tb.

[0010] Preferably, the second triboluminescent filler comprises ZnS:Mn, CaZnOS:Mn, CaAl2O4:Mn, or CaGa4O7:Mn.

[0011] Preferably, the adhesive resin includes one or more of PTFE emulsion, FEP emulsion, PFA emulsion, PVDF emulsion, polyurethane, and phenolic resin.

[0012] Preferably, the solid lubricating filler includes one or more of graphite, molybdenum disulfide, boron nitride, tungsten disulfide, carbon fiber, glass fiber, alumina, silicon carbide, and zirconium oxide; the wetting and dispersing agent includes one or more of SDS, SDBS, BYK-154, and BYK-110; and the leveling agent includes one or more of BYK333, BYK346, BYK359, and TEGO-410.

[0013] This invention provides a triboluminescent functional coating, which is made from the triboluminescent functional coating described in the above technical solution.

[0014] This invention provides the application of the triboluminescent functional coating or the triboluminescent functional coating described in the above-mentioned technical solution in the monitoring of micro-leakage in mechanical seals.

[0015] Preferably, the mechanical seal micro-leakage monitoring is the mechanical seal micro-leakage monitoring of rotating machinery; the rotating machinery includes spacecraft, pumps, or compressors.

[0016] This invention provides a method for monitoring micro-leakage in mechanical seals, comprising the following steps: During the operation of the mechanical seal, the triboluminescent signal of the triboluminescent functional coating formed by the triboluminescent functional coating described in the above technical solution is collected; when the intensity of the triboluminescent signal decreases or quenches, it is determined that there is a leaking medium in contact with the triboluminescent functional coating; when the triboluminescent signal changes from a single-peak signal to a double-peak signal, it is determined that the triboluminescent functional coating has been damaged or abnormally worn.

[0017] Preferably, the leaking medium includes one or more of PAO6, PAO8, PAO10, PAO16, PPG, PAG, and white oil.

[0018] This invention provides a triboluminescent functional coating, comprising the following components in parts by weight: 40-70 parts of adhesive resin, 5-40 parts of a first triboluminescent filler, 4-10 parts of a second triboluminescent filler, 0-10 parts of a solid lubricating filler, 0.02-0.2 parts of a wetting and dispersing agent, and 0.02-0.2 parts of a leveling agent. The first triboluminescent filler is a triboluminescent material dispersed in the adhesive resin matrix that produces a first characteristic emission peak under normal friction conditions of the coating formed by the triboluminescent functional coating. The second triboluminescent filler is a triboluminescent material dispersed in the adhesive resin matrix that produces a second characteristic emission peak, distinct from the first characteristic emission peak, when the surface of the coating formed by the triboluminescent functional coating is worn or damaged. Addressing the technical shortcomings of existing mechanical seal micro-leakage monitoring technologies, such as complex system structure, large equipment size and power consumption, high preparation and operating costs, single monitoring dimensions, and inability to meet the long-term real-time monitoring needs of spacecraft in orbit, this invention optimizes the formulation system and monitoring mechanism of the triboluminescent functional coating. Compared with existing technologies, this invention has the following beneficial effects: First, this invention constructs a dual-filler synergistic bimodal triboluminescence monitoring system, achieving precise dual monitoring of both the mechanical seal leakage status and the coating's own health status. The coating of this invention is compounded with two functionally differentiated triboluminescent fillers. The first triboluminescent filler generates a stable first characteristic emission peak under normal coating friction conditions, serving as a benchmark monitoring signal for normal seal operation. When a micro-leakage occurs in the seal, it causes the emission signal intensity to attenuate and quench, accurately identifying micro-leakage faults. The second triboluminescent filler only generates a second characteristic emission peak, distinct from the first, when the coating experiences wear or structural damage, effectively identifying coating failures. This dual-response mechanism clearly distinguishes between leakage faults and coating-related faults, solving the problems of traditional monitoring technologies such as single-dimensionality, inability to trace fault origins, and low monitoring accuracy, significantly improving the comprehensiveness and reliability of mechanical seal condition monitoring.

[0019] Secondly, this invention eliminates the need for external light excitation, electrical excitation, and complex detection systems, achieving passive, low-power, and miniaturized real-time monitoring. The functional coating of this invention can directly generate luminescent detection signals through interfacial friction during the mechanical seal's operation, eliminating the need for complex equipment systems such as electrical detection, optical excitation, and sensor acquisition that traditional leak detection technologies rely on. This completely solves the drawbacks of traditional monitoring systems, such as cumbersome structure, large size, and high power consumption. The overall monitoring method is simple and efficient, perfectly adaptable to the lightweight, low-power, and highly integrated on-orbit application requirements of spacecraft. It is also widely applicable to sealing monitoring scenarios of various rotating mechanical equipment such as pumps and compressors, exhibiting extremely strong environmental adaptability.

[0020] Third, the coating formulation of this invention is simple, the raw materials are readily available, and the preparation and application costs are low, making it highly valuable for engineering industrialization and promotion. The coating mainly consists of an adhesive resin, two types of triboluminescent fillers, functional additives, and lubricating fillers. All components are conventional commercial chemical raw materials, readily available and with low procurement costs. Furthermore, the overall coating preparation process is simple and convenient, requiring no sophisticated, large-scale, or complex production equipment, resulting in low production barriers and high preparation efficiency.

[0021] Fourth, this invention boasts strong adaptability and good compatibility, requiring no modification to existing equipment structures, thus exhibiting excellent practicality and adaptability. Utilizing a conventional air-spraying molding process, this invention can directly adapt to existing standardized production processes for mechanical seals, eliminating the need for modifications or upgrades to the mechanical seal's body structure or assembly process. It can quickly achieve compatibility with existing mass production lines and equipment operating conditions, resulting in extremely low modification costs. Simultaneously, the accompanying solid lubricating filler imparts excellent friction and wear properties to the coating, optimizing the mechanical seal's interface friction characteristics while simultaneously achieving monitoring functionality, thus balancing seal operational stability and fault monitoring capabilities.

[0022] Fifth, this invention has strong resistance to environmental interference and can achieve long-term stable online dynamic monitoring. Compared with traditional detection technologies, which are susceptible to interference from extreme environments such as alternating high and low temperatures, vacuum, and radiation in space, and are prone to signal distortion, this invention achieves signal output based on the intrinsic triboluminescence properties of materials. The monitoring mechanism is stable, has strong environmental adaptability, and can withstand complex and extreme service environments. It can continuously capture instantaneous and intermittent micro-leakage faults during equipment operation, achieving real-time online monitoring under all operating conditions and for long periods, effectively meeting the core leak detection requirements for long-term on-orbit service of spacecraft. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure after the triboluminescent functional coating of the present invention is coated on the optical axis fixing ring; Figure 2 This is a schematic diagram of the monitoring device provided by the present invention; Figure 3 The images show the emission spectra of the functional coating of this invention before and after damage. Figure 4 The luminescence intensity reduction rate of the functional coating in Example 1 of this invention when different amounts of PAO6 oil are added; In the figure: 1-Optical axis fixing ring, 2-Triboluminescent functional coating, 3-Optical axis, 4-Mechanical seal component, 5-Mechanical seal gland. Detailed Implementation

[0024] This invention provides a triboluminescent functional coating, comprising the following components in parts by weight: 40-70 parts of adhesive resin, 5-40 parts of a first triboluminescent filler, 4-10 parts of a second triboluminescent filler, 0-10 parts of a solid lubricating filler, 0.02-0.2 parts of a wetting and dispersing agent, and 0.02-0.2 parts of a leveling agent; the first triboluminescent filler is a triboluminescent material dispersed in the adhesive resin matrix that generates a first characteristic emission peak under normal friction conditions of the coating formed by the triboluminescent functional coating; the second triboluminescent filler is a triboluminescent material dispersed in the adhesive resin matrix that generates a second characteristic emission peak, distinct from the first characteristic emission peak, when the surface of the coating formed by the triboluminescent functional coating is worn or damaged.

[0025] In this invention, unless otherwise specified, all raw materials / components used in the preparation are commercially available products well known to those skilled in the art.

[0026] The triboluminescent functional coating provided by this invention comprises 40-70 parts, preferably 45-65 parts, of adhesive resin by weight, and in the embodiments, 60 parts, 58 parts, and 50 parts. In this invention, the adhesive resin preferably comprises one or more of PTFE emulsion, FEP emulsion, PFA emulsion, PVDF emulsion, polyurethane, and phenolic resin. This invention does not have special requirements regarding the source of the PTFE emulsion, FEP emulsion, PFA emulsion, PVDF emulsion, polyurethane, and phenolic resin; commercially available products well known to those skilled in the art can be used.

[0027] Based on the mass fraction of the adhesive resin, the triboluminescent functional coating provided by the present invention includes 5 to 40 parts of the first triboluminescent filler, preferably 10 to 35 parts, more preferably 20 to 32 parts, and in the embodiments, it can be 28 parts, 30 parts, or 26 parts. In the present invention, the first triboluminescent filler preferably includes ZnS:Cu or CaF2:Tb.

[0028] Based on the mass fraction of the adhesive resin, the triboluminescent functional coating provided by the present invention comprises 4 to 10 parts of a second triboluminescent filler, preferably 4 to 9 parts, and in the embodiments, it can be 4 parts, 8 parts, 5 parts, or 6 parts. In the present invention, the second triboluminescent filler preferably comprises ZnS:Mn, CaZnSOS:Mn, CaAl2O4:Mn, or CaGa4O7:Mn.

[0029] Based on the mass fraction of the adhesive resin, the triboluminescent functional coating provided by the present invention comprises 0 to 10 parts of solid lubricating filler, preferably 0 to 8 parts, and in the embodiments, it can be 0 parts, 5 parts, 2 parts, 3 parts, or 7 parts. In the present invention, the solid lubricating filler preferably includes one or more of graphite, molybdenum disulfide, boron nitride, tungsten disulfide, carbon fiber, glass fiber, alumina, silicon carbide, and zirconium oxide.

[0030] Based on the mass fraction of the adhesive resin, the triboluminescent functional coating provided by the present invention comprises 0.02 to 0.2 parts of a wetting and dispersing agent, preferably 0.06 to 0.18 parts, more preferably 0.08 to 0.16 parts, and in the embodiments, it can be 0.1 parts, 0.15 parts, or 0.13 parts. In the present invention, the wetting and dispersing agent preferably includes one or more of SDS, SDBS, BYK-154, and BYK-110.

[0031] Based on the mass fraction of the adhesive resin, the triboluminescent functional coating provided by the present invention includes 0.02 to 0.2 parts of leveling agent, preferably 0.06 to 0.18 parts, more preferably 0.08 to 0.16 parts, and in the embodiments, it can be 0.1 parts, 0.15 parts, or 0.13 parts. In the present invention, the leveling agent preferably includes one or more of BYK333, BYK346, BYK359, and TEGO-410.

[0032] This invention provides a method for preparing the triboluminescent functional coating described above, preferably comprising the following steps: The adhesive resin, the first triboluminescent filler, the second triboluminescent filler, the solid lubricating filler, the wetting and dispersing agent, and the leveling agent are mixed to obtain the triboluminescent functional coating; when the mass fraction of the solid lubricating filler is 0, the addition of the solid lubricating filler is omitted.

[0033] This invention provides the application of the triboluminescent functional coating described above in the preparation of a triboluminescent functional coating for monitoring micro-leakage of mechanical seals.

[0034] This invention provides a triboluminescent functional coating, which is made from the triboluminescent functional coating described in the above technical solution.

[0035] This invention provides a method for preparing the triboluminescent functional coating described above, preferably comprising the following steps: A triboluminescent functional slurry is obtained by mixing an adhesive resin, a first triboluminescent filler, a second triboluminescent filler, a solid lubricating filler, a wetting and dispersing agent, a leveling agent, and water. When the mass fraction of the solid lubricating filler is 0, the solid lubricating filler is omitted. The triboluminescent functional slurry is coated onto a substrate surface and then cured to obtain a triboluminescent functional coating. In this invention, the preferred mixing sequence includes: placing the adhesive resin, the first triboluminescent filler, the second triboluminescent filler, and the solid lubricating filler into a container, and then sequentially adding water, a wetting and dispersing agent, and a leveling agent. The coating can be sprayed. The substrate can be an optical axis fixing ring. The coating is preferably sprayed, and the coating amount of the triboluminescent functional slurry is preferably 40~150 g / m³. 2More preferably 60~140 g / m 2 More preferably 60~120 g / m 2 More preferably, it is 60~90 g / m 2 The curing process is preferably heat curing. The heat curing temperature is preferably 350~380℃, and the time is preferably 15~20min.

[0036] This invention provides the application of the triboluminescent functional coating or the triboluminescent functional coating described in the above-mentioned technical solution in the monitoring of micro-leakage in mechanical seals.

[0037] In this invention, the monitoring of micro-leakage in mechanical seals is preferably the monitoring of micro-leakage in mechanical seals of rotating machinery. The rotating machinery preferably includes spacecraft, pumps, or compressors.

[0038] This invention provides a method for monitoring micro-leakage in mechanical seals, comprising the following steps: During the operation of the mechanical seal, the triboluminescent signal of the triboluminescent functional coating formed by the triboluminescent functional coating described in the above technical solution is collected; when the intensity of the triboluminescent signal decreases or quenches, it is determined that there is a leaking medium in contact with the triboluminescent functional coating; when the triboluminescent signal changes from a single-peak signal to a double-peak signal, it is determined that the triboluminescent functional coating has been damaged or abnormally worn.

[0039] In this invention, the leakage medium preferably includes one or more of PAO6, PAO8, PAO10, PAO16, PPG, PAG, and white oil. In a specific embodiment of this invention, the invention first uses the triboluminescent functional coating described in the above technical solution to prepare a triboluminescent functional coating on the surface of a substrate. The substrate can be an optical axis fixing ring. Preferably, the optical axis fixing ring with the triboluminescent functional coating on its surface is fixed to the main shaft of the mechanical seal using a locating pin, forming a friction pair with the mechanical seal gland, and then monitoring is performed. In this invention, when the triboluminescent signal quenches, the amount of leakage medium in contact with the triboluminescent functional coating is preferably ≥1.59 μL / cm³. 2 The leakage threshold of the leaking medium is 1.59 μL / cm. 2 The aforementioned abnormal wear refers to the damage to the triboluminescent coating due to wear.

[0040] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0041] Example 1 Weigh 60g of PTFE emulsion, 28g of ZnS:Cu powder and 4g of CaZnOS:Mn powder and put them into a beaker. Then add 3mL of deionized water, 0.1g of SDBS and 0.1g of BYK346 in sequence and mix. Stir well to obtain the slurry of triboluminescent coating.

[0042] The obtained slurry was sprayed onto the optical axis fixing ring (spraying amount: 90g / m). 2 Then, heat curing is performed (the heat curing temperature is 380℃ and the time is 15min) to obtain an optical axis fixing ring with a triboluminescent coating.

[0043] The optical axis retaining ring is fixed to the optical axis using a locating pin, so that it forms a friction pair with the mechanical seal gland.

[0044] Coating performance test: Friction and wear performance: The friction and wear performance of the coating was tested using a CSM friction and wear tester with a test load of 5 N and a rotation speed of 200 r / min.

[0045] Adhesion: The adhesion test was conducted in accordance with the method in GB / T 9286—1998 "Cross-cut test of paint and varnish film".

[0046] Flexibility: The flexibility test was conducted in accordance with GB / T 1731—1993 "Test Method for Flexibility of Coating Film".

[0047] Oil level monitoring performance test: The performance of micro-leakage monitoring was tested using a simulation platform, such as Figure 2 Oil leakage was simulated by dripping oil onto the coating. PAO6 oil was then added while the mechanical seal was in operation.

[0048] Coating health status monitoring performance test: Adopting such Figure 2 The simulation platform shown was used for testing. An external force was applied to cause the mechanical seal spindle to deflect at an angle, thereby damaging the coating.

[0049] Test results: Coefficient of friction: 0.13~0.14; Flexibility: 2mm; Adhesion: Grade 1; Oil monitoring performance: When the mechanical seal gland rotates and rubs against the optical axis fixing ring, the coating exhibits stable single-peak luminescence at 1.59 μL / cm². 2 Under PAO6 contact conditions of 100°C and above, triboluminescence is almost completely quenched; bimodal luminescence appears when the coating is damaged. This indicates that the coating can be used for micro-leakage monitoring and monitoring of the coating's own health status.

[0050] Comparative Example 1 Weigh 60g of PTFE emulsion and 28g of ZnS:Cu powder into a beaker, then add 3mL of deionized water, 0.1g of SDBS, and 0.1g of BYK346 in sequence, mix and stir evenly to obtain the slurry of triboluminescent coating.

[0051] The obtained slurry was sprayed onto the optical axis fixing ring (spraying amount: 90g / m). 2 Then, heat curing is performed (the heat curing temperature is 380℃ and the time is 15min) to obtain an optical axis fixing ring with a triboluminescent coating.

[0052] The optical axis retaining ring is fixed to the optical axis using a locating pin, so that it forms a friction pair with the mechanical seal gland.

[0053] Test results: Coefficient of friction: 0.13~0.14; Flexibility: 2mm; Adhesion: Grade 1; Oil monitoring performance: When the mechanical seal gland rotates and rubs against the optical axis fixing ring, the coating exhibits stable single-peak luminescence at 1.59 μL / cm². 2 Under PAO6 contact conditions of 100°C and above, triboluminescence is almost completely quenched; when the coating is damaged, only a single-peak luminescence enhancement occurs. This indicates that the coating can be used for micro-leakage monitoring, but its own health status monitoring is difficult to identify.

[0054] Figure 3 The images show the emission spectra of the coatings in Example 1 and Comparative Example 1 before and after damage. It can be seen that the addition of CaZnOS:Mn can monitor the health status of the coating by observing changes in the number of emission peaks. Figure 3 Curve 1 in the figure represents the spectrum (single peak at 524 nm) of the coating when ZnS:Cu and CaZnS:Mn were added in Example 1. Figure 3 Curve 3 in the figure shows the spectrum when the coating was damaged after adding ZnS:Cu and CaZnS:Mn, and a double-peak feature (double peak) appeared in the spectrum. Figure 3 Curve 2 in the figure is the spectrum of the coating when it was damaged in Comparative Example 1 when only ZnS:Cu was added and no CaZnS:Mn was added.

[0055] Figure 4 The value represents the rate of decrease in luminescence intensity of the functional coating in Example 1 of this invention when different amounts of PAO6 oil are added. Figure 4 It can be seen that the decrease in triboluminescence intensity increases with the increase of PAO6 addition. At 1.59 μL / cm 2 Under PAO6 contact conditions as described above, triboluminescence is almost completely quenched. Therefore, 1.59 μL / cm 2 This is the effective leakage detection threshold for the coating system.

[0056] Example 2 Weigh 58g of PTFE emulsion, 30g of ZnS:Cu powder and 8g of CaAl2O4:Mn powder, put them into a beaker, and then add 5g of boron nitride, 4mL of deionized water, 0.15g of SDS and 0.15g of BYK359 in sequence. Mix and stir evenly to obtain the slurry of triboluminescent coating.

[0057] The obtained slurry was sprayed onto the optical axis fixing ring (spraying amount: 90g / m). 2 Then, heat curing is performed (the heat curing temperature is 380℃ and the time is 15min) to obtain an optical axis fixing ring with a triboluminescent coating.

[0058] The optical axis retaining ring is fixed to the optical axis using a locating pin, so that it forms a friction pair with the mechanical seal gland.

[0059] Test results: Friction coefficient: 0.15~0.18; Flexibility: 2mm; Adhesion: Grade 1; Oil monitoring performance: When the mechanical seal gland rotates and rubs against the optical axis fixing ring, the coating exhibits stable single-peak luminescence. When the leaked oil reaches the detectable threshold, the triboluminescence is almost completely quenched. When the coating is damaged, bi-peak luminescence appears. This indicates that the coating can achieve micro-leakage monitoring and coating health status monitoring.

[0060] Example 3 Weigh 60g of PFA emulsion, 30g of ZnS:Cu powder and 5g of CaZnOS:Mn powder, put them into a beaker, and then add 2g of carbon fiber, 1mL of deionized water, 0.1g of BYK110 and 0.13g of BYK333 in sequence. Mix and stir evenly to obtain the slurry of triboluminescent coating.

[0061] The obtained slurry was sprayed onto the optical axis fixing ring (spraying amount: 100g / m). 2 Then, heat curing is performed (the heat curing temperature is 380℃ and the time is 15min) to obtain an optical axis fixing ring with a triboluminescent coating.

[0062] The optical axis retaining ring is fixed to the optical axis using a locating pin, so that it forms a friction pair with the mechanical seal gland.

[0063] Test results: Friction coefficient: 0.14~0.16; Flexibility: 2mm; Adhesion: Grade 1; Oil monitoring performance: When the mechanical seal gland rotates and rubs against the optical axis fixing ring, the coating exhibits stable single-peak luminescence. When the leaked oil reaches the detectable threshold, the triboluminescence is almost completely quenched. When the coating is damaged, bi-peak luminescence appears. This indicates that the coating can achieve micro-leakage monitoring and coating health status monitoring.

[0064] Example 4 Weigh 50g of FEP emulsion, 26g of ZnS:Cu powder and 8g of CaGa4O7:Mn powder, put them into a beaker, and then add 3g of zirconium oxide, 3mL of deionized water, 0.15g of SDS and 0.13g of TEGO-410 in sequence. Mix and stir evenly to obtain the slurry of triboluminescent coating.

[0065] The obtained slurry was sprayed onto the optical axis fixing ring (spraying amount: 90g / m). 2 Then, heat curing is performed (the heat curing temperature is 380℃ and the time is 15min) to obtain an optical axis fixing ring with a triboluminescent coating.

[0066] The optical axis retaining ring is fixed to the optical axis using a locating pin, so that it forms a friction pair with the mechanical seal gland.

[0067] Test results: Friction coefficient: 0.13~0.15; Flexibility: 2mm; Adhesion: Grade 1; Oil monitoring performance: When the mechanical seal gland rotates and rubs against the optical axis fixing ring, the coating exhibits stable single-peak luminescence. When the leaked oil reaches the detectable threshold, the triboluminescence is almost completely quenched. When the coating is damaged, bi-peak luminescence appears. This indicates that the coating can achieve micro-leakage monitoring and coating health status monitoring.

[0068] Example 5 Weigh 60g of PVDF emulsion, 30g of ZnS:Cu powder and 6g of ZnS:Mn powder, put them into a beaker, and then add 7g of graphite, 3mL of deionized water, 0.13g of SDBS and 0.13g of BYK346 in sequence. Mix and stir evenly to obtain the slurry of triboluminescent coating.

[0069] The obtained slurry was sprayed onto the optical axis fixing ring (spraying amount: 90g / m). 2 Then, heat curing is performed (the heat curing temperature is 380℃ and the time is 15min) to obtain an optical axis fixing ring with a triboluminescent coating.

[0070] The optical axis retaining ring is fixed to the optical axis using a locating pin, so that it forms a friction pair with the mechanical seal gland.

[0071] Test results: Friction coefficient: 0.15~0.18; Flexibility: 2mm; Adhesion: Grade 1; Oil monitoring performance: When the mechanical seal gland rotates and rubs against the optical axis fixing ring, the coating exhibits stable single-peak luminescence. When the leaked oil reaches the detectable threshold, the triboluminescence is almost completely quenched. When the coating is damaged, bi-peak luminescence appears. This indicates that the coating can achieve micro-leakage monitoring and coating health status monitoring.

[0072] As can be seen from the above embodiments, the present invention provides a triboluminescent functional coating for monitoring micro-leakage in mechanical seals, and a triboluminescent functional coating formed therefrom. The present invention aims to solve the technical defects of existing mechanical seal micro-leakage monitoring methods, such as complex structure, high cost, and susceptibility to environmental interference. The triboluminescent functional coating provided by the present invention is composed of triboluminescent fillers (first triboluminescent filler and second triboluminescent filler) and adhesive resin, etc. It does not require external light or electrical excitation and can generate luminescent signals by utilizing the friction during the operation of the mechanical seal. The leakage state and coating health state can be identified by changes in luminescence intensity and luminescence peak. It has the characteristics of simple structure, convenient preparation, and applicability to mechanical seal condition monitoring in rotating machinery.

[0073] Comparative Example 2 Weigh 60g of PTFE emulsion, 3g of ZnS:Cu powder and 2g of CaZnOS:Mn powder and put them into a beaker. Then add 3mL of deionized water, 0.1g of SDBS and 0.1g of BYK346 in sequence and mix. Stir well to obtain the slurry of triboluminescent coating.

[0074] The obtained slurry was sprayed onto the optical axis fixing ring (spraying amount: 100g / m). 2 Then, heat curing is performed (the heat curing temperature is 380℃ and the time is 15min) to obtain an optical axis fixing ring with a triboluminescent coating.

[0075] The optical axis retaining ring is fixed to the optical axis using a locating pin, so that it forms a friction pair with the mechanical seal gland.

[0076] Test results: Coefficient of friction: 0.12~0.16; Flexibility: 2mm; Adhesion: Grade 1; Oil monitoring performance: When the mechanical seal gland rotates and rubs against the optical axis fixing ring, the coating's luminescence intensity is unstable or does not emit light. (Note: The last part about 1.59 μL / cm is unrelated and appears to be a separate, incomplete thought.) 2 After the oil was applied, the triboluminescence was almost completely quenched; bimodal luminescence appeared when the coating was damaged. This indicates that the coating can monitor its own health status, but it has shortcomings in monitoring micro-leakage.

[0077] Comparative Example 3 Weigh out 60g of PTFE emulsion, 28g of BaSrSi2O2N2:Eu powder, and 4g of Y3Al5O 12 Ce powder was placed in a beaker, and then 3 mL of deionized water, 0.1 g of SDBS, and 0.1 g of BYK346 were added in sequence. The mixture was stirred until homogeneous to obtain the slurry of the triboluminescent coating.

[0078] The obtained slurry was sprayed onto the optical axis fixing ring (spraying amount: 90g / m). 2Then, heat curing is performed (the heat curing temperature is 380℃ and the time is 15min) to obtain an optical axis fixing ring with a triboluminescent coating.

[0079] The optical axis retaining ring is fixed to the optical axis using a locating pin, so that it forms a friction pair with the mechanical seal gland.

[0080] Test results: Coefficient of friction: 0.15~0.18; Flexibility: 2mm; Adhesion: Grade 1; Oil monitoring performance: The coating does not emit light when the mechanical seal gland rotates and rubs against the optical axis retaining ring. It also does not emit light when the coating is damaged. This indicates that the coating is completely unsuitable for monitoring micro-leakage and its own health status.

[0081] As can be seen from the above embodiments, the present invention aims to solve the technical defects of existing mechanical seal micro-leakage monitoring methods, such as complex structure, high cost, and susceptibility to environmental interference. The triboluminescent functional coating provided by the present invention is composed of triboluminescent filler and adhesive resin. It does not require external light excitation or electrical excitation and can generate luminescent signals by utilizing the friction during the operation of the mechanical seal. The leakage state and coating health state can be identified by changes in luminescence intensity and luminescence peak. It has the characteristics of simple structure, convenient preparation, and applicability to mechanical seal condition monitoring of rotating machinery.

[0082] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. Other embodiments can be obtained based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A triboluminescent functional coating, characterized in that, The composition comprises the following components in parts by weight: 40-70 parts of adhesive resin, 5-40 parts of first triboluminescent filler, 4-10 parts of second triboluminescent filler, 0-10 parts of solid lubricating filler, 0.02-0.2 parts of wetting and dispersing agent, and 0.02-0.2 parts of leveling agent; the first triboluminescent filler is a triboluminescent material dispersed in the adhesive resin matrix that produces a first characteristic emission peak under normal friction conditions of the coating formed by the triboluminescent functional coating; the second triboluminescent filler is a triboluminescent material dispersed in the adhesive resin matrix that produces a second characteristic emission peak, distinct from the first characteristic emission peak, when the surface of the coating formed by the triboluminescent functional coating is worn or damaged.

2. The triboluminescent functional coating according to claim 1, characterized in that, The first triboluminescent filler comprises ZnS:Cu or CaF2:Tb.

3. The triboluminescent functional coating according to claim 1 or 2, characterized in that, The second triboluminescent filler includes ZnS:Mn, CaZnOS:Mn, CaAl2O4:Mn, or CaGa4O7:Mn.

4. The triboluminescent functional coating according to claim 1, characterized in that, The adhesive resin includes one or more of PTFE emulsion, FEP emulsion, PFA emulsion, PVDF emulsion, polyurethane, and phenolic resin.

5. The triboluminescent functional coating according to claim 1 or 4, characterized in that, The solid lubricating filler includes one or more of graphite, molybdenum disulfide, boron nitride, tungsten disulfide, carbon fiber, glass fiber, alumina, silicon carbide, and zirconium oxide; the wetting and dispersing agent includes one or more of SDS, SDBS, BYK-154, and BYK-110; and the leveling agent includes one or more of BYK333, BYK346, BYK359, and TEGO-410.

6. A triboluminescent functional coating, characterized in that, Made from the triboluminescent functional coating as described in any one of claims 1 to 5.

7. The application of the triboluminescent functional coating according to any one of claims 1 to 5 or the triboluminescent functional coating according to claim 6 in the monitoring of micro-leakage in mechanical seals.

8. The application according to claim 7, characterized in that, The mechanical seal micro-leakage monitoring refers to the monitoring of mechanical seal micro-leakage in rotating machinery; the rotating machinery includes spacecraft, pumps, or compressors.

9. A method for monitoring micro-leakage in mechanical seals, characterized in that, Includes the following steps: During the operation of the mechanical seal, the triboluminescent signal of the triboluminescent functional coating formed by the triboluminescent functional coating according to any one of claims 1 to 5 is collected; when the intensity of the triboluminescent signal decreases or quenches, it is determined that there is a leaking medium in contact with the triboluminescent functional coating; when the triboluminescent signal changes from a single-peak signal to a double-peak signal, it is determined that the triboluminescent functional coating has been damaged or abnormally worn.

10. The monitoring method according to claim 9, characterized in that, The leaked medium includes one or more of PAO6, PAO8, PAO10, PAO16, PPG, PAG, and white oil.

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