Self-emulsifying flaw detection penetrating fluid and production process thereof

Abstract

The invention relates to the technical field of nondestructive testing, discloses a self-emulsifying flaw detection penetrating fluid and a production process thereof, and aims at solving the technical problem that in the washing process of an existing penetrating fluid, the penetrating fluid in a flaw is prone to being excessively cleaned, and consequently missing detection is caused. The interface barrier agent can spontaneously migrate to a defect opening in the permeation process to form a physical barrier, a defect indicating signal in a defect is prevented from being removed by water washing, the anchoring emulsifier and a trigger type post-spraying emulsifier needing to be additionally applied act synergistically, accurate emulsification of redundant penetrating fluid on the surface of a workpiece is achieved, and the surface of the workpiece is protected. The invention also provides a production process of the penetrating fluid and a flaw detection method comprising the two-step emulsification cleaning process. According to the technical scheme, through the synergistic effect of the components, loss of penetrating fluid in defects is effectively prevented, meanwhile, a clean workpiece background is obtained, and the detection reliability, the signal-to-noise ratio and the small defect detection rate are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology, specifically to a self-emulsifying flaw detection penetrant and its production process. Background Technology

[0002] Penetrant testing, as a widely used non-destructive testing method, is used to detect defects such as cracks, porosity, and folds on the surface of metals, ceramics, and other non-porous materials. The basic process of this technology includes applying penetrant, penetrating, removing excess penetrant from the surface, developing, and observing. In this process, a key step is how to accurately remove excess penetrant from the workpiece surface while completely preserving and locking the penetrant that has penetrated into the defect. This is the core of ensuring the reliability and sensitivity of the test.

[0003] In conventional self-emulsifying penetrants, an emulsifier is usually pre-mixed into the oily matrix of the penetrant to achieve water washing removal. While this design simplifies the operation, it also introduces an inherent technical drawback: during the water washing process, the water flow not only acts on the workpiece surface but also penetrates into the defect, emulsifying with the penetrant within the defect. This uncontrollable cleaning action can easily wash away the penetrant used for indication within the defect, causing the defect indication to weaken or even disappear completely, resulting in missed detection. This problem is particularly prominent for defects that are wide and shallow.

[0004] To address this issue, the industry has developed post-emulsification penetrant testing technology. This technology separates penetrant and emulsification into two independent steps: first, a penetrant without emulsifier is applied, followed by the application of a separate emulsifier. This improves the retention of penetrant within defects to some extent. However, this method adds an extra step, and the emulsification time is extremely critical. If the emulsification time is too short, the surface background will not be thoroughly cleaned, resulting in false defect indications and affecting observation. If the emulsification time is too long, the emulsifier will also excessively penetrate into the defect, leading to over-cleaning problems similar to those of self-emulsifying penetrants, thus negating the advantages of this method.

[0005] Therefore, existing penetrant testing technology has always faced an inherent technical contradiction: improving the washability of penetrant often comes at the cost of its ability to remain in defects. How to ensure a clean background on the workpiece surface while minimizing the loss of the defect indicator inside the defect, thereby improving the signal-to-noise ratio and overall reliability of the test, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The present invention aims to solve the technical problem in the prior art that during the water washing process, the permeate existing inside the defect is easily washed away, resulting in missed detection or reduced detection sensitivity.

[0007] To address the aforementioned technical problems, this invention provides a self-emulsifying flaw detection penetrant and its production process.

[0008] The first aspect of this invention provides a self-emulsifying flaw detection penetrant: The self-emulsifying flaw detection penetrant, by weight, comprises the following components: 60-75 samples were infiltrated. 5-10 parts of penetration enhancer; 1-3 parts anchoring emulsifier; 0.5-2 parts of interfacial barrier agent; 3-6 parts of the indicator; Stabilizer 2-4 parts.

[0009] In this technical solution, the mechanisms of action of each component are as follows: Anchoring emulsifier: This component is not the main emulsifier in the penetrant system. Its molecular structure allows it to adhere to the surface of oily droplets in the penetrant, forming a molecular anchor point. This anchor point remains stable in the penetrant itself, but when it comes into contact with a specific external emulsifier, it can specifically bind to it, thereby initiating the emulsification process of excess penetrant on the workpiece surface. Interface barrier agent: This component has low surface tension. During the process of penetrant being applied to the workpiece and left to stand, this component will spontaneously migrate to the interface between the penetrant and air. When the penetrant enters the defects on the workpiece surface, this component will accumulate at the liquid-gas interface at the opening of the defect, forming a physical barrier. This barrier can prevent the subsequent cleaning medium from entering the interior of the defect, thereby preventing the penetrant inside the defect from being over-cleaned. Through the synergistic effect of the anchoring emulsifier and the interface barrier agent, the controllable emulsification and cleaning of excess permeate on the surface is achieved, while protecting the permeate inside the defect from being washed out, thus improving the reliability and signal-to-noise ratio of the flaw detection. In one specific embodiment, the permeation body is composed of a mixture of dioctyl phthalate and deodorized kerosene, wherein the weight of dioctyl phthalate is 1.4-1.6 times that of the deodorized kerosene; In another specific embodiment, the penetration enhancer is n-butanol, and the anchoring emulsifier is polyethylene glycol monostearate; In another specific embodiment, the interface barrier agent is octamethylcyclotetrasiloxane, and the stabilizer is 2,6-di-tert-butyl-p-cresol; In another specific embodiment, the desiccant is selected from either a colorant or a fluorescent agent. When the desiccant is a colorant, it may be Sudan IV; when the desiccant is a fluorescent agent, it may be sodium fluorescein.

[0010] A second aspect of this invention provides a production process for a self-emulsifying flaw detection penetrant: This process is used to produce the self-emulsifying flaw detection penetrant described in any of the aforementioned technical solutions, and includes the following steps: S1. Pretreatment: Dehydration treatment of the permeation substrate and permeation promoter; S2, Base Liquid Mixing: The permeate pretreated in step S1 is added to the reaction vessel and heated and stirred. S3. Addition of functional agents: Keep the temperature constant, add the penetration promoter, interface barrier agent and anchoring emulsifier that have been pretreated in step S1 in sequence, and increase the stirring rate after adding the anchoring emulsifier. Then add the defect indicator and stabilizer, and continue stirring; S4. Cooling and filtering: Cool and filter the liquid obtained in step S3 to obtain the self-emulsifying flaw detection penetrant.

[0011] In a preferred embodiment, the technical parameters of the production process are as follows: In step S1, the dehydration process continues until the water content of the permeation substrate and the permeation promoter is no higher than 0.1%. Furthermore, this dehydration process is carried out under vacuum conditions at atmospheric pressure and a temperature of 80-100℃. In step S2, the reactor is heated to 40-50℃ and stirred at a stirring rate of 300-400 r / min for 8-12 minutes. In step S3, after adding the penetration enhancer and the interface barrier agent, stir for 15-25 minutes; After adding the anchoring emulsifier, increase the stirring speed to 450-550 r / min and stir for 18-25 minutes; After adding the indicator and stabilizer, continue stirring for 25-35 minutes; In step S4, a filter membrane with a pore size of 0.4-0.5 μm is used for filtration.

[0012] This invention provides a self-emulsifying flaw detection penetrant and its production process. It has the following beneficial effects: 1. This invention solves the technical problem of easy loss of defect indication signals inside defects during conventional water washing by adding an interface barrier agent to the permeate components. The interface barrier agent utilizes its physical properties to spontaneously migrate and accumulate at the liquid-air interface at the defect opening after the permeate penetrates into the defect, thereby forming a physical isolation layer. In subsequent water washing steps, this isolation layer acts as a barrier to effectively prevent external water washing media from entering the defect, thereby preventing the permeate remaining in the defect from being diluted or washed away, thus keeping the defect indication signal stably in the defect. This overcomes the problem of weakened or disappeared indication due to excessive washing, thereby improving the stability and reliability of the detection results.

[0013] 2. This invention establishes a controllable two-step emulsification mechanism by setting an anchoring emulsifier and combining it with an externally applied trigger-type post-spray emulsifier, thereby improving the accuracy of the cleaning process. The anchoring emulsifier remains stable in the oily system of the penetrant and does not directly emulsify with water. The initiation of the emulsification process depends on the subsequent independently applied trigger-type post-spray emulsifier. This design limits the occurrence of the emulsification reaction to a specific time point and workpiece surface area, ensuring that only the excess penetrant located on the workpiece surface that needs to be removed is emulsified and cleaned, without affecting the penetrant that has entered the defect and has not come into contact with the trigger-type emulsifier. Thus, the controllability and accuracy of the cleaning process are guaranteed.

[0014] 3. This invention significantly improves the signal-to-noise ratio of flaw detection through the synergistic effect of the interface barrier agent and the anchoring emulsifier. On the one hand, the interface barrier agent achieves the preservation and locking of the effective signal inside the defect through physical isolation. On the other hand, the combination of the anchoring emulsifier and the triggering emulsifier ensures the complete removal of background noise on the workpiece surface. This dual effect of protecting the signal internally and removing noise externally results in a high contrast between the final defect indication and the workpiece background, enhancing the clarity and sharpness of the defect display. Therefore, this invention can effectively improve the detection rate of minute defects and the overall detection sensitivity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the process flow of the present invention; Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] The main raw materials and reagents used in the following examples and comparative examples have the following sources and specifications. Reagents not specifically mentioned are all commercially available analytical grade or higher grade products.

[0018] Dioctyl phthalate, CAS No.: 117-81-7; Deodorized kerosene, CAS No.: 8020-83-5; n-Butanol, CAS No.: 71-36-3; Polyethylene glycol monostearate, CAS No.: 9004-99-3; Octamethylcyclotetrasiloxane, CAS No.: 556-67-2; Sudan IV, CAS No.: 85-83-6; Sodium fluorescein, CAS No.: 518-47-8; 2,6-Di-tert-butyl-p-cresol, CAS No.: 128-37-0; Sodium dodecylbenzenesulfonate, CAS No.: 25155-30-0; Polysorbate-80, CAS No.: 9005-65-6.

[0019] Examples 1-3: Example 1: This embodiment provides a self-emulsifying flaw detection penetrant, the components of which, by weight, include: Permeation substrate: 60 parts (including 36 parts of dioctyl phthalate and 24 parts of deodorized kerosene); Penetration enhancer (n-butanol): 5 parts; Anchoring emulsifier (polyethylene glycol monostearate): 1 part; Interface barrier agent (octamethylcyclotetrasiloxane): 0.5 parts; Indicator of deficiency (Sudan Red IV): 3 parts; Stabilizer (2,6-di-tert-butyl-p-cresol): 2 parts; Its production process includes the following steps: Pretreatment: The permeation matrix consisting of 36 parts dioctyl phthalate and 24 parts deodorized kerosene, and 5 parts n-butanol were subjected to vacuum dehydration treatment at atmospheric pressure and 80°C until the water content was no higher than 0.1%.

[0020] Base liquid mixing: Add the pretreated permeate matrix to the reactor, heat to 40°C, and stir at a stirring rate of 300 r / min for 8 minutes.

[0021] Functional agent addition: Maintain the temperature inside the reactor at 40°C, add pretreated n-butanol and 0.5 parts of octamethylcyclotetrasiloxane in sequence, and stir for 15 minutes; Then add 1 part of polyethylene glycol monostearate, increase the stirring speed to 450 r / min, and stir for 18 minutes; Finally, add 3 parts Sudan IV and 2 parts 2,6-di-tert-butyl-p-cresol, and continue stirring for 25 minutes.

[0022] Cooling and filtration: After cooling the obtained liquid to room temperature, it is filtered through a filter membrane with a pore size of 0.5 μm to obtain the self-emulsifying flaw detection penetrant.

[0023] Example 2: This embodiment provides a self-emulsifying flaw detection penetrant, the components of which, by weight, include: Permeation component: 67.5 parts (including 40.5 parts of dioctyl phthalate and 27 parts of deodorized kerosene); Penetration enhancer (n-butanol): 7.5 parts; Anchoring emulsifier (polyethylene glycol monostearate): 2 parts; Interface barrier agent (octamethylcyclotetrasiloxane): 1.25 parts; Indicator of deficiency (Sudan Red IV): 4.5 parts; Stabilizer (2,6-di-tert-butyl-p-cresol): 3 parts; Its production process includes the following steps: Pretreatment: A permeation matrix consisting of 40.5 parts dioctyl phthalate and 27 parts deodorized kerosene, and 7.5 parts n-butanol were subjected to vacuum dehydration treatment at atmospheric pressure and 90°C until the water content was no higher than 0.1%.

[0024] Base solution mixing: Add the pretreated permeate matrix to the reactor, heat to 45°C, and stir at a stirring rate of 350 r / min for 10 minutes.

[0025] Functional agent addition: Maintain the temperature inside the reactor at 45°C, add pretreated n-butanol and 1.25 parts of octamethylcyclotetrasiloxane in sequence, and stir for 20 minutes; Then add 2 parts of polyethylene glycol monostearate, increase the stirring speed to 500 r / min, and stir for 21 minutes; Finally, add 4.5 parts Sudan IV and 3 parts 2,6-di-tert-butyl-p-cresol, and continue stirring for 30 minutes.

[0026] Cooling and filtration: After cooling the obtained liquid to room temperature, it is filtered through a filter membrane with a pore size of 0.45 μm to obtain the self-emulsifying flaw detection penetrant.

[0027] Example 3: This embodiment provides a self-emulsifying flaw detection penetrant, the components of which, by weight, include: Permeation substrate: 75 parts (including 45 parts of dioctyl phthalate and 30 parts of deodorized kerosene); Penetration enhancer (n-butanol): 10 parts; Anchoring emulsifier (polyethylene glycol monostearate): 3 parts; Interface barrier agent (octamethylcyclotetrasiloxane): 2 parts; Indicator (sodium fluorescein): 6 parts; Stabilizer (2,6-di-tert-butyl-p-cresol): 4 parts; Its production process includes the following steps: Pretreatment: A permeation matrix consisting of 45 parts dioctyl phthalate and 30 parts deodorized kerosene, and 10 parts n-butanol were subjected to vacuum dehydration treatment at atmospheric pressure and 100°C until the water content was no higher than 0.1%.

[0028] Base solution mixing: Add the pretreated permeate matrix to the reactor, heat to 50°C, and stir at a stirring rate of 400 r / min for 12 minutes.

[0029] Functional agent addition: Maintain the temperature inside the reactor at 50°C, add pretreated n-butanol and 2 parts of octamethylcyclotetrasiloxane in sequence, and stir for 25 minutes; Then add 3 parts of polyethylene glycol monostearate, increase the stirring speed to 550 r / min, and stir for 25 minutes; Finally, add 6 parts sodium fluorescein and 4 parts 2,6-di-tert-butyl-p-cresol, and continue stirring for 35 minutes.

[0030] Cooling and filtration: After cooling the obtained liquid to room temperature, it is filtered through a filter membrane with a pore size of 0.4 μm to obtain the self-emulsifying flaw detection penetrant.

[0031] Application example: This application example provides a trigger-type post-spray emulsifier, which is used in conjunction with the self-emulsifying flaw detection penetrant prepared in Examples 1-3 above during actual operation. Its preparation method is as follows: At room temperature, add 5 parts of sodium dodecylbenzenesulfonate to 95 parts of deionized water, turn on the stirrer, and stir at a rate of 200 r / min for 20 minutes until there are no solid particles in the system and a homogeneous and clear solution is formed, which is the trigger-type post-spray emulsifier. The following steps describe the specific operational procedures for nondestructive testing using the self-emulsifying penetrant and trigger-type post-spray emulsifier provided by this invention: Workpiece pretreatment: The workpiece surface is degreased and cleaned by solvent cleaning, and then dried with clean compressed air to ensure that the surface to be inspected is clean and dry; Apply penetrant: The self-emulsifying flaw detection penetrant prepared in Example 2 is applied evenly to the surface of the workpiece to be inspected by spraying to ensure complete coverage; Osmosis: Allow to osmosis for 15 minutes; Pre-cleaning: Use a clean, dry, lint-free cloth to gently wipe the surface of the workpiece to remove most of the residual penetrant; Applying the trigger-type post-spray emulsifier: The trigger-type post-spray emulsifier prepared in Example 4 is uniformly sprayed onto the surface of the workpiece by spraying. Emulsification: Allow to stand for 2 minutes to emulsify, allowing the penetrant on the workpiece surface to react with the emulsifier; Water washing: Use clean water with a temperature range of 15-40℃ and a pressure not exceeding 250kPa to spray and clean the surface of the workpiece from a distance of about 40cm until the penetrating liquid of the surface background is removed. Drying: Place the cleaned workpiece in a circulating hot air drying oven at 50-60℃ for drying; Applying developer: Using a powder spraying method, dry powder developer is evenly applied to the surface of the workpiece to be inspected to form a thin and uniform developing layer. Observation and evaluation: The surface of the workpiece is observed under white light with an illuminance of not less than 1000 lx. After the penetrant at the defect is absorbed by the developer, it appears as a red line or spot-like defect indicator on a white background. The defect indicator is evaluated according to relevant standards.

[0032] Comparative Examples 1-2: Comparative Example 1: Compared with Example 2, the difference is that its components do not contain an interfacial barrier agent (octamethylcyclotetrasiloxane), while the remaining components and preparation process are the same.

[0033] Comparative Example 2: Compared with Example 2, the difference is that its components do not contain anchoring emulsifiers and interface barrier agents, but instead use an equivalent amount of conventional emulsifier (polysorbate-80) instead, while the remaining components and preparation process are the same.

[0034] Test Example 1-2: Test Example 1: Test of Permeate Retention Capacity within Defects This test case aims to quantitatively evaluate the ability of different penetrants to remain inside defects after standardized cleaning.

[0035] Experimental steps: Four identical type A standard test blocks were selected, and each test block had quenching cracks with a width of 20 μm on its surface; The permeating solutions prepared in Examples 1, 2 and Comparative Example 1, as well as a permeating solution prepared by replacing the defect indicator in the formulation of Example 3 with an equal amount of Sudan IV, were uniformly applied to the crack areas of the four test blocks respectively. Let all test blocks stand for 15 minutes to allow the penetrant to fully penetrate the defects; Wipe away any residual permeate from the surface of each test block with a dry, clean cloth. The triggered post-spray emulsifier prepared in Example 4 was evenly sprayed onto the surface of all test blocks and allowed to stand for 2 minutes to emulsify. Use a water flow with a pressure of 200 kPa and a temperature of 25°C to spray and clean all test blocks for 30 seconds at a distance of 40 cm from the surface of the test blocks. After cleaning, use a pipette to draw 5.0 mL of acetone and repeatedly rinse the cracked area of ​​each test piece to completely dissolve and wash out the residual penetrant in the defect. Collect all the acetone solution containing the dissolved matter into a 25mL volumetric flask, and dilute to the mark with acetone, then shake well. Using a spectrophotometer, the absorbance of the solution in each volumetric flask was measured at the maximum absorption wavelength of Sudan IV. The absorbance value is directly proportional to the concentration of the defect indicator in the solution, which directly reflects the amount of permeate remaining in the defect after cleaning.

[0036] Experimental data: Table 1: Test results of residual agent in defects Test sample Absorbance (Abs) Example 1 0.438 Example 2 0.512 Example 3 (after replacement of missing agent) 0.605 Comparative Example 1 0.121 Analysis of experimental results: In summary, the test data in Table 1 clearly show that after standardized emulsification and washing processes, the residual amount of the permeate prepared by the formulations of Examples 1, 2, and 3 in the defects of the test blocks is significantly higher than that of the permeate prepared by the formulation of Comparative Example 1. This result objectively confirms that the permeate in this technical solution has stronger resistance to removal during the washing process.

[0037] The effectiveness of this technology is attributed to the presence of an interfacial barrier agent in the permeate component. During the permeation process, octamethylcyclotetrasiloxane, which has a low surface tension, migrates to the interface between the permeate and the air. When the permeate enters the defect, this component is enriched at the liquid-gas interface at the defect opening, thereby forming a physical barrier. This barrier can prevent the subsequent washing medium from entering the internal space of the defect, thus isolating the main part of the permeate remaining in the defect from the washing medium.

[0038] In contrast, the components of Comparative Example 1 did not contain an interface barrier agent. Therefore, during the water washing step, the water washing medium could penetrate into the defect and directly contact the permeate therein, replacing or washing it away, resulting in a large loss of the defect indicator and a lower measured absorbance value. Therefore, the addition of an interface barrier agent is the direct technical reason for effectively maintaining the defect indicator signal inside the defect, providing a basis for improving the signal-to-noise ratio and reliability of the detection.

[0039] Test Example 2: Background Residue Test on Workpiece Surface This test case aims to quantitatively evaluate the degree of background residue on the workpiece surface after cleaning with different penetrants.

[0040] Experimental steps: Four identical, smooth, defect-free metal test plates with surfaces sandblasted to the same roughness were selected. The permeate solutions prepared in Examples 1, 2 and Comparative Example 2, as well as a permeate solution prepared by replacing the defect indicator in the formulation of Example 3 with an equal amount of Sudan IV, were uniformly applied to the surface of four test plates. Let all test plates stand for 15 minutes; For the three test plates that were treated with the permeate of Example 1, Example 2 and Example 3 (which replaced the defect indicator), the trigger-type post-spray emulsifier prepared in Example 4 was sprayed evenly first, and allowed to stand for 2 minutes to emulsify, and then washed with water. For the test plates that were treated with the permeate of Comparative Example 2, they were washed directly with water. The washing conditions were uniformly set as follows: using a water flow with a pressure of 200 kPa and a temperature of 25°C, all test panels were sprayed and cleaned for 30 seconds at a distance of 40 cm from the surface of the test panels. After cleaning, all test plates were placed in a 60℃ circulating hot air drying oven for drying. Using a surface colorimeter, five random sampling points were taken from the surface of each dried test panel, and the a value in the CIELab color space was recorded. * Values ​​(red and green values), and calculate the average, a * The higher the value, the more severe the red residue on the surface and the more background residue there is.

[0041] Experimental data: Table 2: Test results of background residue on workpiece surface Test sample <![CDATA[Average surface chromaticity (a * )]]> Example 1 1.83 Example 2 1.57 Example 3 (after replacement of missing agent) 1.49 Comparative Example 2 26.42 Analysis of experimental results: Summary: The test data in Table 2 show that after treatment with the formulations of Examples 1, 2 and 3 (which replaced the defect indicator), the color values ​​of the test panel surface were significantly lower than those of the test panel treated with the formulation of Comparative Example 2. This result objectively reflects that after cleaning, the penetrant in this technical solution leaves less background residue on the workpiece surface and the surface is cleaner.

[0042] The effectiveness of this technology stems from the two-step controllable emulsification cleaning mechanism employed in this technical solution. The anchoring emulsifier (polyethylene glycol monostearate) in the penetrant component remains stable in the oily penetrant system and does not directly interact with water. Only when an externally triggered post-spray emulsifier (sodium dodecylbenzenesulfonate solution) is applied does the latter specifically bind with the anchoring emulsifier, thereby initiating the emulsification process of excess penetrant on the workpiece surface. This controlled and timed reaction ensures that emulsification occurs precisely only on the surface penetrant that needs to be removed.

[0043] In contrast, the penetrant in Comparative Example 2 directly incorporates a conventional emulsifier (polysorbate-80) into the penetrant matrix, resulting in the entire penetrant system exhibiting the characteristic of emulsifying upon contact with water. During the water washing process, this direct emulsification is difficult to control precisely, and it is easy to form a thin film of oil-water mixture on the workpiece surface that is difficult to completely remove due to incomplete or excessive emulsification, thus leading to high background residue. Therefore, the synergistic effect of anchoring emulsifier and trigger-type post-sprayed emulsifier is a direct technical means to achieve low background residue and improve the signal-to-noise ratio.

Claims

1. A self-emulsifying flaw detection penetrant, characterized in that, By weight, its components include: Infiltrating subjects: 60-75 copies; Penetration enhancer: 5-10 parts; Anchoring emulsifier: 1-3 parts; Interface barrier agent: 0.5-2 parts; Indicator of deficiency: 3-6 parts; Stabilizer: 2-4 parts.

2. The self-emulsifying flaw detection penetrant according to claim 1, characterized in that, The permeation substrate is composed of a mixture of dioctyl phthalate and deodorized kerosene, wherein the weight of dioctyl phthalate is 1.4-1.6 times that of the deodorized kerosene.

3. The self-emulsifying flaw detection penetrant according to claim 1, characterized in that, The penetration enhancer is n-butanol, and the anchoring emulsifier is polyethylene glycol monostearate.

4. The self-emulsifying flaw detection penetrant according to claim 1, characterized in that, The interface barrier agent is octamethylcyclotetrasiloxane, and the stabilizer is 2,6-di-tert-butyl-p-cresol.

5. The self-emulsifying flaw detection penetrant according to claim 1, characterized in that, The indicator is selected from either a colorant or a fluorescent agent, wherein the colorant is Sudan IV and the fluorescent agent is sodium fluorescein.

6. A production process for a self-emulsifying flaw detection penetrant, characterized in that, The method for producing a self-emulsifying flaw detection penetrant as described in any one of claims 1-5 comprises the following steps: S1. Pretreatment: Dehydration treatment of the permeation substrate and permeation promoter; S2, Base Liquid Mixing: The permeate pretreated in step S1 is added to the reaction vessel and heated and stirred. S3. Addition of functional agents: Keep the temperature constant, add the penetration promoter, interface barrier agent and anchoring emulsifier pretreated in step S1 in sequence, and increase the stirring rate after adding the anchoring emulsifier. Then add the colorant or fluorescent agent and stabilizer and continue stirring. S4. Cooling and filtering: Cool and filter the liquid obtained in step S3 to obtain the self-emulsifying flaw detection penetrant.

7. The production process according to claim 6, characterized in that, The dehydration process in step S1 is a vacuum dehydration performed under normal pressure and a temperature of 80-100°C until the water content of the permeation substrate and the permeation promoter is no higher than 0.1%.

8. The production process according to claim 6, characterized in that, In step S2, the temperature is raised to 40-50℃, and the mixture is stirred at a stirring rate of 300-400 r / min for 8-12 minutes.

9. The production process according to claim 6, characterized in that, The S3 step is specifically as follows: First, add the penetration enhancer and interface barrier agent and stir for 15-25 minutes; Add the anchoring emulsifier and increase the stirring speed to 450-550 r / min, stirring for 18-25 minutes; Finally, add the colorant or fluorescent agent and stabilizer and continue stirring for 25-35 minutes.

10. The production process according to claim 6, characterized in that, In step S4, filtration is performed using a filter membrane with a pore size of 0.4-0.5 μm.

Images