Steel rail flaw detection coupling agent and preparation method thereof

Abstract

The invention discloses a steel rail flaw detection coupling agent which is characterized by comprising the following components in parts by weight: 40 parts of ethylene glycol; 60 parts of water; 5 parts of polyacrylamide gel; 2 parts of an antirust agent; 2 parts of a stabilizer; and the additive is 0.01 part of a color matching pigment. According to the coupling agent disclosed by the invention, through the proportion of specific components, the coupling agent has excellent sound transmission performance, so that ultrasonic waves can be more effectively transmitted into a steel rail, and the accuracy and depth of flaw detection are improved; the freezing point of the coupling agent is remarkably reduced by adding ethylene glycol, so that the coupling agent can be kept in a liquid state in a low-temperature environment, the flaw detection effect is prevented from being influenced by freezing, and the coupling agent is particularly suitable for railway detection in cold regions; the antirust agent in the formula can effectively prevent the steel rail and flaw detection equipment from being rusted in the using process, and the service life is prolonged; the anti-rust agent comprises morpholine, diethanol amine and triethanolamine in a mass ratio of 1: 1: 1, and has a good anti-corrosion effect.

Description

Technical Field

[0001] The invention relates to the technical field of coupling agents, and in particular to a coupling agent for rail flaw detection. Background Art

[0002] As a non-destructive testing technology, ultrasonic flaw detection is widely used in the inspection of railway facilities such as rails. Through ultrasonic flaw detection, defects such as cracks, pores, and inclusions inside the rails can be accurately detected, thereby effectively improving the safety and stability of railway transportation. Especially in the use of high-speed railways and heavy-load railways, the quality of rails is crucial to the safety of train operation. Therefore, ultrasonic flaw detection has become one of the important means of safety inspection of rails in the railway industry.

[0003] In practical applications, the quality of ultrasonic flaw detection is affected by many factors, and the performance of the coupling agent is one of the important factors. Traditionally, the coupling agents commonly used in the railway industry are mainly engine oil, transformer oil, water, etc. Although these coupling agents can transmit ultrasonic signals to a certain extent, they have some significant shortcomings, which affect the accuracy and efficiency of ultrasonic flaw detection.

[0004] Poor sound transmission is a major problem of traditional coupling agents. Coupling agents such as engine oil and transformer oil usually have high density and viscosity, which directly affects the penetration ability of ultrasonic signals. The transmission efficiency of ultrasonic waves is limited by the contact conditions between the coupling agent and the rail, the viscosity of the coupling agent, and the surface smoothness. Therefore, when using these coupling agents, it is difficult for ultrasonic waves to effectively penetrate the rail, resulting in inaccurate flaw detection results and easy to miss potential cracks and defects.

[0005] The problem of traditional coupling agents being easy to solidify and freeze in low temperature environments is particularly prominent. In cold seasons or regions, especially in winter, common motor oil or water-based coupling agents tend to thicken or completely freeze at low temperatures, making them unable to be used normally. Ultrasonic flaw detection requires a good coupling state between the rail surface and the probe, but solidification at low temperatures makes the coupling between the probe and the rail unstable, thus affecting the flaw detection effect.

[0006] Many traditional coupling agents also have the disadvantage of easily contaminating the surface of metal materials. Oily substances such as engine oil and transformer oil can easily adhere to the surface of the rail, contaminating the rail and even affecting subsequent maintenance. These substances not only increase the workload of cleaning, but may also change the characteristics of the rail surface during the flaw detection process, causing changes in the reflection or refraction of the ultrasonic signal, which further affects the flaw detection results.

[0007] Therefore, how to provide a rail flaw detection coupling agent and a preparation method thereof is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0008] One object of the present invention is to provide a rail flaw detection coupling agent and a preparation method thereof. The present invention has excellent sound transmission performance through the ratio of specific components, so that ultrasonic waves can be more effectively transmitted into the interior of the rail, thereby improving the accuracy and depth of flaw detection; the addition of ethylene glycol significantly reduces the freezing point of the coupling agent, so that the coupling agent can remain in a liquid state in a low-temperature environment, avoiding the influence of ice on the flaw detection effect, and is particularly suitable for railway detection in cold areas; the rust inhibitor in the formula can effectively prevent the rail and the flaw detection equipment from rusting during use, thereby extending the service life; the rust inhibitor includes morpholine, diethanolamine and triethanolamine in a mass ratio of 1:1:1, and has a good anti-corrosion effect.

[0009] The coupling agent of the present invention is a water-based formula, which is easy to clean, harmless to the human body and pollution-free to the environment. Compared with the traditional oil-based coupling agent, it has higher environmental protection. By adding pigments and fragrances, the sensory experience of the coupling agent is improved, the acceptance of the staff is improved, the manufacturing method is simple, and it is easy to mass produce and apply.

[0010] A rail flaw detection coupling agent according to an embodiment of the present invention is characterized in that the coupling agent is composed of the following components in parts by weight:

[0011] Ethylene glycol is 40 parts;

[0012] Water is 60 parts;

[0013] Polyacrylamide gel is 5 copies;

[0014] The rust inhibitor is 2 parts;

[0015] The stabilizer is 2 parts;

[0016] The additive coloring pigment is 0.01 part.

[0017] Furthermore, the ethylene glycol and water are mixed as the liquid matrix.

[0018] Furthermore, the rust inhibitor is morpholine, diethanolamine and triethanolamine in a mass ratio of 1:1:1.

[0019] Furthermore, the stabilizer is xylylene diisocyanate and hexamethylene diisocyanate in a mass ratio of 1:1.

[0020] Further, the preparation steps are as follows:

[0021] Step 1: Add water into the reactor, start the stirring unit of the reactor, and add ethylene glycol and a liquid matrix mixed with water and ethylene glycol while stirring the reactor;

[0022] Step 2: Add the polyacrylamide gel into the liquid matrix and stir for 1 hour until the ethylene glycol and the polyacrylamide gel are completely dissolved and evenly dispersed;

[0023] Step 3: Add the rust inhibitor, stabilizer and additive color pigment into the reaction kettle in sequence, and stir thoroughly for 0.5h until the rust inhibitor, stabilizer and additive color pigment are completely dispersed and evenly mixed.

[0024] Furthermore, in step 1 and step 2, the heating temperature of the reactor is maintained in the range of 50-60°C.

[0025] Furthermore, in step 1 and step 2, the stirring speed of the stirring unit of the reactor is 300-600 rpm.

[0026] Furthermore, in step three, the heating temperature of the reactor is maintained in the range of 20-30°C.

[0027] Furthermore, in step three, the stirring speed of the stirring unit of the reactor is 300-500 rpm.

[0028] The beneficial effects of the present invention are:

[0029] The coupling agent of the present invention has excellent sound transmission performance through the ratio of specific components, so that ultrasonic waves can be more effectively transmitted into the interior of the rail, thereby improving the accuracy and depth of flaw detection; the addition of ethylene glycol significantly reduces the freezing point of the coupling agent, so that the coupling agent can remain in a liquid state in a low-temperature environment, thereby avoiding the influence of the flaw detection effect due to ice formation, and is particularly suitable for railway detection in cold areas; the rust inhibitor in the formula can effectively prevent the rail and the flaw detection equipment from rusting during use, thereby extending the service life; the rust inhibitor includes morpholine, diethanolamine and triethanolamine in a mass ratio of 1:1:1, and has a good anti-corrosion effect.

[0030] The coupling agent of the present invention is a water-based formula, which is easy to clean, harmless to the human body and pollution-free to the environment. Compared with the traditional oil-based coupling agent, it has higher environmental protection. By adding pigments and fragrances, the sensory experience of the coupling agent is improved, the acceptance of the staff is improved, the manufacturing method is simple, and it is easy to mass produce and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 The present invention is a flow chart for preparing a rail flaw detection coupling agent. DETAILED DESCRIPTION

[0033] Please refer to Figure 1 The present invention provides a rail flaw detection coupling agent, which is composed of the following components in parts by weight:

[0034] Ethylene glycol is 40 parts;

[0035] Water is 60 parts;

[0036] Polyacrylamide gel is 5 copies;

[0037] The rust inhibitor is 2 parts;

[0038] The stabilizer is 2 parts;

[0039] The additive coloring pigment is 0.01 part.

[0040] Specifically, the ethylene glycol and water are mixed as a liquid matrix; the rust inhibitor is morpholine, diethanolamine and triethanolamine in a mass ratio of 1:1:1; the stabilizer is xylene diisocyanate and hexamethylene diisocyanate in a mass ratio of 1:1.

[0041] More specifically, the preparation steps are as follows:

[0042] Step 1: Add water into the reactor, start the stirring unit of the reactor, and add ethylene glycol and a liquid matrix mixed with water and ethylene glycol while stirring the reactor;

[0043] Step 2: Add the polyacrylamide gel into the liquid matrix and stir for 1 hour until the ethylene glycol and the polyacrylamide gel are completely dissolved and evenly dispersed;

[0044] Step 3: Add the rust inhibitor, stabilizer and additive color pigment into the reaction kettle in sequence, and stir thoroughly for 0.5h until the rust inhibitor, stabilizer and additive color pigment are completely dispersed and evenly mixed.

[0045] More specifically, in step 1 and step 2, the heating temperature of the reactor is maintained in the range of 50-60°C; in step 1 and step 2, the stirring speed of the stirring unit of the reactor is 300-600rpm; in step 3, the heating temperature of the reactor is maintained in the range of 20-30°C; in step 3, the stirring speed of the stirring unit of the reactor is 300-500rpm.

[0046] Ethylene glycol and water: As a liquid matrix, ethylene glycol lowers the freezing point, making the coupling agent less likely to solidify and freeze in a low-temperature environment.

[0047] Polyacrylamide gel: used to improve the viscosity of the coupling agent so that it can better adhere to the rail surface.

[0048] Rust inhibitor: It is composed of morpholine, diethanolamine and triethanolamine in a ratio of 1:1:1, which can effectively prevent rust on rails and flaw detection equipment.

[0049] Stabilizer: A mixture of xylylene diisocyanate and hexamethylene diisocyanate to ensure the stability of the coupling agent.

[0050] Additive color pigment: used to improve the visual effect of the coupling agent and facilitate observation by operators.

[0051] In order to verify the performance of the coupling agent of the present invention, a series of experimental tests were carried out, as follows:

[0052] 1. Sound transmission test

[0053] 1.1. Experimental purpose:

[0054] The sound transmission effect of the coupling agent of the present invention in ultrasonic flaw detection was verified, and compared with traditional engine oil, the depth of ultrasonic wave penetration into the rail was tested.

[0055] 1.2 Experimental conditions:

[0056] Standard rail samples:

[0057] Model and size: Use rail samples of uniform model to ensure that the surface of the rail is smooth and has no obvious defects. The length is 1.5 meters, the width is 20 cm, and the thickness is 1.2 cm.

[0058] Surface treatment: remove all oil, rust and impurities from the rail surface, use a special cleaner to clean the rail, and wipe it clean with a dust-free cloth to ensure that the surface is uniform and free of pollution, and avoid uneven surface or foreign matter that affects the transmission of ultrasonic waves.

[0059] 1.3. Flaw detection equipment:

[0060] Ultrasonic flaw detector: A high-precision ultrasonic flaw detector is used with a frequency set to 2MHz, which is suitable for the thickness range of the rail.

[0061] Probe type: Use single crystal probe, which has high ultrasonic transmission efficiency and can accurately measure ultrasonic penetration depth.

[0062] Apply pressure: Apply standard moderate pressure when the coupling agent contacts the rail surface to avoid affecting the penetration depth due to excessive or insufficient pressure. The standard pressure is set to 30N.

[0063] 1.4. Application of coupling agent:

[0064] Even application: Use a scraper or special tool to ensure that the coupling agent is evenly applied on the rail surface, with a coating thickness of about 0.5mm.

[0065] Waiting time after application: Wait for 5 minutes after application to allow the coupling agent to fully combine with the rail surface to avoid overflow or uneven distribution.

[0066] 1.5 Experimental environment:

[0067] The laboratory temperature is maintained at 25℃±2℃ and the humidity is controlled between 50%-60% to avoid the influence of ambient temperature changes on the performance of the coupling agent.

[0068] 1.6. Test method:

[0069] Testing process:

[0070] Phase 1: On the same rail sample, ultrasonic flaw detection is performed using the coupling agent of the present invention, and the penetration depth and reflected wave intensity at different positions (center position, left end, right end, etc.) are recorded.

[0071] Phase 2: Repeat the same ultrasonic flaw detection test on the same rail sample using conventional engine oil as a coupling agent, and also record the penetration depth and reflected wave intensity at different positions.

[0072] Test Location:

[0073] Center position: the middle of the rail;

[0074] Edge position: the left and right ends of the rail to ensure comprehensive measurement;

[0075] Depth: The penetration depth is recorded and analyzed in combination with the reflected wave intensity to ensure signal clarity.

[0076] Measurement records:

[0077] Penetration depth measurement: Measure each test position at least 3 times and record the penetration depth each time;

[0078] Reflected wave intensity: The reflected wave intensity (unit: dB) displayed by the ultrasonic flaw detector is used to evaluate the penetration effect of the coupling agent and the signal clarity.

[0079] Data processing:

[0080] The penetration depth and reflected wave intensity data of each test location were statistically analyzed, and the mean value and standard deviation were calculated.

[0081] The difference between the coupling agent of the present invention and the traditional engine oil was compared to further evaluate the sound transmission effect.

[0082] 1.7. Testing process:

[0083] Phase 1: Testing using the coupling agent of the present invention:

[0084] The coupling agent of the present invention is evenly applied on the surface of the rail, and after waiting for 5 minutes, an ultrasonic flaw detector is used to perform flaw detection.

[0085] The ultrasonic penetration depth at the center, left and right ends of the rail, as well as the reflected wave intensity were recorded.

[0086] Each position was measured three times, and the average values ​​of penetration depth and reflected wave intensity were calculated.

[0087] Phase 2: Testing with conventional oil:

[0088] Apply conventional engine oil evenly on the same rail, wait for 5 minutes, and then use an ultrasonic flaw detector to detect flaws.

[0089] The ultrasonic penetration depth at the center, left and right ends of the rail, and the reflected wave intensity are also recorded.

[0090] Each position was measured three times, and the average values ​​of penetration depth and reflected wave intensity were calculated.

[0091] 1.8. Test data presentation example:

[0092]

[0093] The ultrasonic penetration depth of the coupling agent of the present invention is significantly higher than that of traditional engine oil, the overall penetration depth is about 10.5 cm, the signal reflection wave intensity reaches more than 68 dB, and the signal is very clear.

[0094] The penetration depth of traditional engine oil is generally shallow, only 6.0-6.2cm, the intensity of the reflected wave is also low (50-52dB), the signal attenuation is obvious, and the penetration effect is poor.

[0095] 1.9 Conclusion:

[0096] The test data fully proves that the coupling agent of the present invention has a much better sound transmission effect in ultrasonic flaw detection than traditional engine oil; the coupling agent of the present invention can not only achieve a deeper penetration depth (about 10 cm or more), but also has a higher signal reflection wave intensity, and can provide a clearer and more accurate ultrasonic flaw detection signal to ensure the accuracy and reliability of flaw detection; in contrast, the sound transmission effect of traditional engine oil is poor, the penetration depth is only about 6 cm, and the signal intensity is significantly attenuated, which makes its application effect in ultrasonic flaw detection limited; therefore, the coupling agent of the present invention has significant advantages, and is suitable for higher-precision and deeper rail flaw detection, especially in an environment where it is necessary to improve the detection depth and signal quality, and has obvious technical advantages.

[0097] 2. Low temperature resistance test

[0098] 1.1. Experimental purpose:

[0099] Verify the performance of the coupling agent of the present invention in a low temperature environment to ensure that it will not freeze in cold conditions and can continue to work effectively.

[0100] 1.2 Experimental conditions:

[0101] Low temperature environment settings:

[0102] Ambient temperature: The laboratory simulates a low temperature environment, the temperature is set to -10℃ and maintained stable for 24 hours to simulate the climatic conditions in cold regions.

[0103] Experimental setup: A dedicated low-temperature box (temperature control range of -20℃ to +25℃) was used to conduct the experiment to ensure temperature stability and to accurately record the ambient temperature during the experiment.

[0104] 1.3. Couplant sample:

[0105] The coupling agent of the present invention is a coupling agent prepared according to a standard ratio.

[0106] Conventional engine oil: commonly used engine oil, used as the control group.

[0107] Container: Use a transparent container of the same material and equal capacity to place the coupling agent sample to ensure that the sample is in contact with the same ambient temperature.

[0108] 1.4. Measurement tools and methods:

[0109] Temperature monitoring: Use a high-precision thermometer to record the temperature changes in the low-temperature box in real time to ensure that the temperature fluctuation does not exceed ±1°C during the experiment.

[0110] Physical state observation: After 24 hours, check the appearance, viscosity, fluidity, and whether the coupling agent has solidified or frozen.

[0111] Ultrasonic flaw detector: Use a standard ultrasonic flaw detector to perform ultrasonic signal transmission tests, set the frequency to 2 MHz, and use a single crystal probe.

[0112] 1.5 Experimental steps:

[0113] Phase 1: The sample is exposed to a low temperature environment;

[0114] The coupling agent of the present invention and conventional engine oil of the same volume are placed in transparent containers respectively, placed in a low temperature box, maintained at a temperature of -10°C, and exposed for 24 hours;

[0115] During the exposure process, record the changes in the sample's appearance every 6 hours, including its fluidity, viscosity, and whether there is freezing or solidification;

[0116] Phase 2: Physical status inspection;

[0117] Appearance inspection: After 24 hours, observe the appearance changes of the two coupling agents, especially check whether they are frozen or solidified;

[0118] Viscosity test: Use a viscometer to measure the viscosity of the coupling agent, observe the change in viscosity after low temperature, and evaluate its fluidity;

[0119] Touch test: Touch the couplant lightly with your finger to check if it has hardened or solidified.

[0120] The third stage: ultrasonic flaw detection effect;

[0121] Apply the two coupling agents to the rail surface respectively, keeping the coating thickness at 0.5mm, to simulate the use of ultrasonic flaw detection;

[0122] Use ultrasonic flaw detectors to inspect rails, record the quality of signal transmission during the inspection process, and measure penetration depth and reflected wave intensity;

[0123] Compare the ultrasonic transmission effects of the two coupling agents in a low-temperature environment, and record their sound transmission effects and signal quality.

[0124] 1.6 Experimental steps:

[0125] Sample preparation:

[0126] The same volume of the coupling agent of the present invention and the conventional engine oil are placed in transparent containers respectively and marked clearly.

[0127] Ensure that the contact surface and sample volume of the container in the low temperature environment are consistent to avoid test errors caused by differences in container size or material.

[0128] Low temperature exposure:

[0129] Place the sample in a temperature-controlled low-temperature box, ensure that the temperature inside the box is stably maintained at -10°C, and record the temperature and sample status every 6 hours.

[0130] Physical status check:

[0131] Appearance inspection: After 24 hours, immediately check whether the two coupling agents are frozen or solidified.

[0132] Viscosity and fluidity test: Use a viscometer (such as a Brookfield viscometer) to test the viscosity of the coupling agent and record its fluidity changes at low temperatures.

[0133] Touch test: Use standard finger touch test to evaluate the hardness and fluidity of the two coupling agents.

[0134] Ultrasonic flaw detection test:

[0135] Using a standard ultrasonic flaw detector (frequency 2 MHz, single crystal probe), ultrasonic flaw detection was performed on the rail surfaces coated with the coupling agent of the present invention and the conventional engine oil, respectively, and the penetration depth and reflected wave intensity were recorded.

[0136] Each sample was measured at least 3 times, and the average value was calculated.

[0137] Test data table:

[0138]

[0139] 1.7 Data analysis and comparison:

[0140] Physical state:

[0141] The coupling agent of the present invention maintains good fluidity in a low temperature environment of -10°C, has no freezing phenomenon, and exhibits high low temperature stability; traditional engine oil thickens and solidifies at low temperatures, and its fluidity decreases significantly, which may affect the flaw detection effect.

[0142] Viscosity test:

[0143] The viscosity of the coupling agent of the present invention is only 0.25 Pa·s, and it still maintains good fluidity at low temperatures; the viscosity of traditional engine oil is relatively high, reaching 0.95 Pa·s, indicating that it has poor fluidity at low temperatures, affecting the coupling effect.

[0144] Ultrasonic penetration depth and reflected wave intensity:

[0145] When the coupling agent of the present invention is used, the ultrasonic penetration depth is 10.2 cm, the reflected wave intensity is 68 dB, and the signal transmission effect is good; when traditional engine oil is used, the ultrasonic penetration depth is only 5.8 cm, the reflected wave intensity is 55 dB, and the signal is obviously attenuated.

[0146] 1.8 Conclusion:

[0147] Through the low-temperature resistance test, the coupling agent of the present invention shows excellent low-temperature stability in a low-temperature environment, without freezing or solidification, and maintains good sound transmission effect and signal quality during ultrasonic flaw detection; in contrast, traditional engine oil has poor fluidity at low temperatures and is prone to solidification, resulting in ultrasonic signal attenuation, reduced penetration depth, and poor flaw detection effect; therefore, the performance of the coupling agent of the present invention in a low-temperature environment is significantly better than that of traditional engine oil, and it can maintain efficient operation in cold areas, and has broad application prospects.

[0148] The coupling agent of the present invention remains liquid in a low temperature environment of -10°C without freezing, thus ensuring normal use in cold areas. On the contrary, conventional engine oil solidifies under the same conditions and cannot be used any more. This indicates that the coupling agent of the present invention has better low temperature adaptability and is particularly suitable for ultrasonic flaw detection of rails in cold environments.

[0149] 3. Anti-rust performance test

[0150] In order to verify the advantages of the rail flaw detection coupling agent of the present invention in terms of anti-rust performance, we conducted the following experiment to compare the anti-rust effects of the coupling agent of the present invention and traditional engine oil in a wet environment.

[0151] 3.1 Experimental Purpose:

[0152] The anti-rust effect of the coupling agent of the present invention on the surface of the rail is verified to ensure that the rail can be effectively prevented from rusting in a humid environment.

[0153] 3.2 Experimental conditions:

[0154] Rail sample: standard rail (length 20 cm, width 5 cm, thickness 1.2 cm), surface untreated.

[0155] Wet environment: The rail samples are placed in a wet environment with a humidity of 85% and a temperature of 25°C to simulate rain or humid climate conditions.

[0156] Coupling agent type: the coupling agent of the present invention and conventional engine oil.

[0157] Test method: After evenly applying coupling agent on the rail surface, expose it to a humid environment for 48 hours, observe whether rust spots appear on the rail surface, and record the rust situation.

[0158] 3.3 Testing process:

[0159] The first stage: the coupling agent of the present invention and the conventional engine oil are respectively evenly applied on the surfaces of two standard rails (the coating thickness on the surface of each rail is about 0.5 mm).

[0160] The second stage: the rail samples were placed in a humid environment (temperature 25° C., humidity 85%) for 48 hours.

[0161] The third stage: Check whether there are rust spots on the surface of the rails, record the rust conditions, and take photos for comparative analysis.

[0162] 3.4 Test results:

[0163] Couplant Type Rail surface corrosion Remark Coupling agent of the present invention No rust spots, no surface corrosion The rail surface remains clean and free of rust Conventional motor oil Obvious rust spots and surface corrosion Obvious rust spots and local corrosion have formed on the rail surface.

[0164] 3.5 Analysis:

[0165] The coupling agent of the present invention: in a humid environment, no rust spots appear on the surface of the rail, which proves that the coupling agent of the present invention has good anti-rust performance, effectively prevents moisture from contacting the surface of the rail, and avoids rusting of the rail.

[0166] Traditional engine oil: Under the coating of traditional engine oil, obvious rust spots appeared on the surface of the rails, indicating that traditional engine oil cannot effectively prevent moisture penetration, causing rust on the surface of the rails.

[0167] 3.6 Conclusion:

[0168] This experiment fully verifies that the anti-rust performance of the coupling agent of the present invention in a humid environment is better than that of traditional engine oil; since a special rust inhibitor is added to the coupling agent of the present invention, a protective layer can be formed on the surface of the rail to effectively block moisture and prevent rust; while the anti-rust performance of traditional engine oil is poor and it is easy to fail in a humid environment, resulting in rust spots on the surface of the rail.

[0169] Comparison between the coupling agent of the present invention and the traditional coupling agent (engine oil):

[0170] Performance Indicators Coupling agent of the present invention Traditional coupling agent (engine oil) Sound Transparency Excellent generally Low temperature resistance superior Poor Anti-rust performance powerful weak Environmental protection high Lower Ease of use high generally

[0171] The rail flaw detection coupling agent and preparation method thereof provided by the present invention successfully solve the problems of poor sound transmission effect, easy icing at low temperature, poor rust resistance and the like of traditional coupling agents through precise component design and reasonable preparation process; experimental results show that the coupling agent of the present invention is excellent in sound transmission effect, low temperature resistance, rust resistance and environmental protection, and is particularly suitable for ultrasonic flaw detection of rails; due to its significant advantages, the present invention has broad application prospects in the railway industry, can effectively improve the accuracy and safety of rail detection, reduce maintenance costs, and has significant economic and social value.

[0172] 4. The rail flaw detection coupling agent of the present invention has the following excellent properties:

[0173] 4.1. Excellent sound effects:

[0174] Through the ratio of specific components, the coupling agent of the present invention has excellent sound transmission performance, so that ultrasonic waves can be more effectively transmitted into the interior of the rail, thereby improving the accuracy and depth of flaw detection.

[0175] 4.2. Good low temperature resistance:

[0176] The addition of ethylene glycol significantly reduces the freezing point of the coupling agent, allowing it to remain liquid in a low-temperature environment, avoiding the impact of ice on the flaw detection effect, and is particularly suitable for railway inspection in cold areas.

[0177] 4.3. Strong anti-rust performance:

[0178] The rust inhibitor in the formula can effectively prevent the rails and flaw detection equipment from rusting during use and extend their service life. The rust inhibitor includes morpholine, diethanolamine and triethanolamine in a mass ratio of 1:1:1, which has a good anti-corrosion effect.

[0179] 4.4. High environmental protection:

[0180] The coupling agent of the present invention is a water-based formula, which is easy to clean, harmless to the human body and pollution-free to the environment. Compared with the traditional oil-based coupling agent, it has higher environmental protection.

[0181] 4.5. Easy to use:

[0182] By adding pigments and fragrances, the sensory experience of the coupling agent is improved, which increases the acceptance of workers. The manufacturing method is simple and easy to mass produce and apply.

[0183] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rail flaw detection coupling agent, characterized in that: The coupling agent is composed of the following components in parts by weight: Ethylene glycol is 40 parts; Water is 60 parts; Polyacrylamide gel is 5 copies; The rust inhibitor is 2 parts; The stabilizer is 2 parts; The additive coloring pigment is 0.01 part.

2. A rail flaw detection coupling agent according to claim 1, characterized in that: The ethylene glycol and water are mixed as a liquid matrix.

3. A rail flaw detection coupling agent according to claim 1, characterized in that: The rust inhibitor is composed of morpholine, diethanolamine and triethanolamine in a mass ratio of 1:1:

1.

4. A rail flaw detection coupling agent according to claim 1, characterized in that: The stabilizer is xylylene diisocyanate and hexamethylene diisocyanate in a mass ratio of 1:

1.

5. The method for preparing a rail flaw detection coupling agent according to claim 1, characterized in that: The preparation steps are as follows: Step 1: Add water into the reactor, start the stirring unit of the reactor, and add ethylene glycol and a liquid matrix mixed with water and ethylene glycol while stirring the reactor; Step 2: Add the polyol into the liquid matrix and stir for 1 hour until the ethylene glycol and polyacrylamide gel are completely dissolved and evenly dispersed; Step 3: Add the rust inhibitor, stabilizer and additive color pigment into the reaction kettle in sequence, and stir thoroughly for 0.5h until the rust inhibitor, stabilizer and additive color pigment are completely dispersed and evenly mixed.

6. The method for preparing a rail flaw detection coupling agent according to claim 5, characterized in that: In step 1 and step 2, the heating temperature of the reactor is maintained in the range of 50-60°C.

7. The method for preparing a rail flaw detection coupling agent according to claim 5, characterized in that: In step 1 and step 2, the stirring speed of the stirring unit of the reactor is 300-600 rpm.

8. The method for preparing a rail flaw detection coupling agent according to claim 5, characterized in that: In step 3, the heating temperature of the reactor is maintained in the range of 20-30°C.

9. The method for preparing a rail flaw detection coupling agent according to claim 5, characterized in that: In step 3, the stirring speed of the stirring unit of the reactor is 300-500 rpm.

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