Replication reagent and replication sampling method for aircraft foreign object injury inspection

Abstract

The invention provides a replica reagent and a replica sampling method for aircraft foreign object injury inspection, and particularly relates to the technical field of aircraft foreign object injury inspection, the replica reagent comprises a volatile reagent and anhydrous acetic acid; the volatile reagent comprises at least one of a volatile alcohol reagent and a volatile ester reagent. The replication reagent special for aircraft foreign object damage sampling is developed, the extraction effect similar to that of an acetone reagent can be achieved, and the sampling waiting time is within an acceptable range. The replica reagent formula contains acetic acid and a volatile reagent which can be easily obtained, and the problem that at present, domestic civil aviation airports and airline companies cannot easily obtain acetone for foreign object damage sampling is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft foreign object damage detection, and in particular to a replica reagent and a replica sampling method for aircraft foreign object damage detection. Background Art

[0002] Foreign objects that may damage aircraft are collectively referred to as foreign objects (Foreign Object Debris). There are many types of foreign objects in the airport area, and their sources are complex. Every time an aircraft is damaged, it is necessary to extract trace foreign objects from the damaged area for testing. The current common method is to use acetone as a replicating reagent and use acetate paper to extract foreign objects in a replicating manner from the damaged area. However, acetone is a strictly controlled chemical and must be approved by the local regulatory authorities before it can be purchased and used. In addition, transportation, storage and use must be strictly controlled. Therefore, it is not easy for domestic civil aviation airports and airlines to obtain acetone for foreign object replica sampling. Therefore, a new solution is needed to replace the current foreign object sampling method of acetate paper plus acetone. Summary of the invention

[0003] The purpose of the present invention is to provide a replica reagent and a replica sampling method for aircraft foreign object damage inspection to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present invention is as follows: The present application provides a replicating reagent for foreign object damage detection of aircraft, the components of the replicating reagent including a volatile reagent and anhydrous acetic acid; The volatile reagent includes at least one of a volatile alcohol reagent and a volatile ester reagent.

[0004] Optionally, the volatile ester reagent includes at least one of methyl acetate and ethyl acetate.

[0005] Optionally, the volatile alcohol reagent includes at least one of methanol, ethanol and propanol.

[0006] Optionally, in the complex reagent, the volume fraction of the anhydrous acetic acid is 50%-70%, and the remainder is the volatile reagent.

[0007] Optionally, the concentration of the volatile agent is greater than or equal to 95wt%, and the concentration of the anhydrous acetic acid is greater than or equal to 99wt%.

[0008] Based on the same inventive concept, the present application also provides a replica sampling method for aircraft foreign object damage inspection, comprising: Wetting the acetate paper with the replicating reagent provided in the present application; Foreign objects on the aircraft's inspection area are extracted using moistened acetate paper.

[0009] Optionally, the acetate paper has a thickness of 80-120 μm.

[0010] Optionally, the length of the acetate paper is 15-25 mm.

[0011] Optionally, the method of wetting the acetate paper with the replica reagent provided in the present application and extracting foreign matter from the inspection area of ​​the aircraft with the wetted acetate paper comprises: Add the replicating reagent to one side of the acetate paper, shake the acetate paper until its surface is moistened, stick the moistened side of the acetate paper to the area to be tested, press the acetate paper to make it fit tightly to the surface of the area to be tested, and then remove the acetate paper.

[0012] Optionally, after pressing the acetate paper to make it closely fit the surface of the inspection area, wait for 15-60 minutes and then remove the acetate paper.

[0013] The beneficial effects of the present invention are: The present invention develops a special replica reagent for sampling aircraft foreign object damage, which can achieve a sampling effect similar to that of acetone reagent, and the waiting time for sampling is within an acceptable range. The replica reagent formula of the present application includes acetic acid and a volatile reagent, both of which can be obtained relatively easily, solving the problem that it is difficult for domestic civil aviation airports and airlines to obtain acetone for foreign object damage sampling.

[0014] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing embodiments of the present invention. DETAILED DESCRIPTION

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0016] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0017] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0018] Cellulose acetate paper (AC paper) is a plastic film made with the help of the replication principle of transmission electron microscopy. It is often used in non-destructive testing of metals. It can replicate the metal surface and extract the residue on it. AC paper usually uses acetone as a dissolving agent, but acetone is a strictly regulated chemical and must be approved by local regulatory authorities before it can be purchased and used. In addition, transportation, storage and use are all subject to strict control. Therefore, it is not easy for domestic civil aviation airports and airlines to obtain acetone as a dissolving agent for AC paper.

[0019] This embodiment provides a replicating reagent for foreign object damage detection in aircraft, characterized in that the components of the replicating reagent include a volatile reagent and anhydrous acetic acid; The volatile reagent includes at least one of a volatile alcohol reagent and a volatile ester reagent.

[0020] The present application provides a special FOD reagent for sampling foreign object damage on aircraft. The formula includes acetic acid and a volatile reagent. When the two are mixed, they can achieve an extraction effect similar to that of an acetone reagent. In addition, the waiting time after pasting is within an acceptable range. Acetic acid and the selected volatile reagent can be obtained relatively easily, which solves the problem that it is difficult for domestic civil aviation airports and airlines to obtain acetone for foreign object damage sampling.

[0021] Ethanol is preferably used as the volatile alcohol reagent. Ethanol is a common chemical that is easy to obtain, low in price, and less harmful when used. Methanol or propanol (n-propanol or isopropanol) can also be used, but methanol and propanol are more toxic and safety precautions need to be taken when using them.

[0022] Volatile ester reagents can be methyl acetate or ethyl acetate, which can achieve the same replica sampling effect, but the cost is higher.

[0023] The concentration of the volatile reagent is greater than or equal to 95wt%, and the concentration of the anhydrous acetic acid is greater than or equal to 99wt%. Preferably, the volatile reagent and the anhydrous acetic acid are both commercially available analytically pure reagents.

[0024] Preferably, in the complex reagent, the volume fraction of the anhydrous acetic acid is 50%-70%, and the remainder is the volatile reagent. As an example: Complex reagent formula 1: 50% anhydrous acetic acid, 50% analytical pure ethanol (volume fraction); Complex reagent formula 2: 60% anhydrous acetic acid, 40% analytical pure ethanol (volume fraction); Complex reagent formula 3: 70% anhydrous acetic acid, 30% analytical pure ethanol (volume fraction); It should be noted that the higher the content of anhydrous acetic acid in the replicating reagent, the stronger the stickiness of the AC paper after wetting, the better the extraction effect, but the longer the waiting time after pasting, so replicating reagents with different component contents are suitable for different scenarios. For example, when civil aviation stops at a station, the shorter the sampling time, the better, so formula 1 can be used. During the post-flight inspection of the aircraft, the sampling time can be appropriately extended, so formula 2 or formula 3 can be used.

[0025] Acetic acid is the main dissolving component in the replication reagent, but the solubility of pure acetic acid is too strong, the AC paper is easily damaged, which is not conducive to the pasting operation, and the drying time after pasting is too long (it takes 4 hours or even longer). Adding volatile reagents mainly reduces the solubility of acetic acid and enhances the volatility of the reagent. Therefore, the waiting time after pasting can be greatly shortened, making the replication reagent achieve an effect similar to that of acetone reagent.

[0026] Based on the same inventive concept, the present application also provides a replica sampling method for foreign object damage inspection of aircraft, the method comprising the steps of: The replicating reagent for aircraft foreign object inspection of the present application can be prepared and used immediately. To ensure that the AC paper is not damaged by the dissolution of the replicating reagent, there are certain requirements for the thickness of the AC paper. It is preferred to use transparent AC paper with a thickness of 80-120 μm and a length of 15-25 mm.

[0027] Cut a piece of AC paper slightly larger than the residue extraction area. The length of the AC paper is preferably 15-25 mm, and more preferably not more than 20 mm. This is because the commercially available AC paper is in a roll, and the cut AC paper is in a curled shape. If the length of the AC paper is too long, after the replica sampling, the AC paper will naturally curl, destroying the replica effect, so that the AC paper cannot accurately reflect the morphology of the area to be inspected. Therefore, the length of the AC paper used each time needs to be small. If the area to be inspected is large, multiple AC papers can be used for multiple extractions.

[0028] Take photos of the damaged areas before sampling. After cutting the AC paper, use a glass dropper to absorb an appropriate amount of replication reagent, and add 1-2 drops of replication reagent to one side of the AC paper. Gently shake the AC paper until its surface is fully moistened, and then use an ear bulb to blow off the excess replication reagent on the surface of the AC paper (too much replication reagent can easily damage the AC paper). After waiting for 1-2 seconds, the AC paper becomes soft and sticky. At this time, immediately stick the moistened side of the AC paper to the area to be inspected, and press it firmly with your fingertips to make the AC paper fit tightly to the surface of the area to be inspected. After sticking the AC paper, take photos again, wait for a while, and remove the AC paper. When submitting for inspection, provide both the electronic version of the photo and the AC paper with foreign objects extracted.

[0029] After the AC paper is pasted on the inspection area, the waiting time is determined by the formula of the replica reagent, which is generally 15-60 minutes. The higher the anhydrous acetic acid content in the formula, the longer the waiting time. Taking the formula of anhydrous acetic acid and ethanol as an example, if the volume fraction of anhydrous acetic acid is 50%, it takes 15 minutes to wait; if the volume fraction of anhydrous acetic acid is 60%, it takes 30 minutes to wait; if the volume fraction of anhydrous acetic acid is 70%, it takes 60 minutes to wait. Different volatile reagents have different volatilization speeds, so the waiting time also needs to be adjusted appropriately according to the selected volatile reagent.

[0030] The following describes the embodiments of the present invention through specific examples. Example 1

[0031] A replica sampling method for aircraft foreign object damage inspection comprises the following steps: S1. Prepare the replica reagent for aircraft foreign object damage inspection according to the following formula: 50% (volume fraction) of analytically pure anhydrous acetic acid; 50% (volume fraction) of analytically pure ethanol; S2. Take photos of the areas damaged by foreign objects before sampling.

[0032] S3. Use 100 μm thick transparent AC test paper, cut 20 mm long AC paper, use a glass dropper to absorb an appropriate amount of replicating reagent, add 2 drops of replicating reagent on one side of the AC paper, gently shake the AC paper until its surface is fully wetted, and then use an ear bulb to blow off the excess replicating reagent on the surface of the AC paper.

[0033] S4. After waiting for 1 second, the AC paper becomes soft and sticky. Immediately stick the moistened side of the AC paper to the area to be inspected. Press firmly with your fingertips to make the AC paper fit tightly and fully contact the surface of the area to be inspected. After sticking the AC paper, take another photo.

[0034] S5. After waiting for 15 minutes, remove the AC paper. Provide the electronic version of the photo and the AC paper for extracting foreign objects at the same time when submitting for inspection. Example 2

[0035] A replica sampling method for aircraft foreign object damage inspection comprises the following steps: S1. Prepare the replica reagent for aircraft foreign object inspection according to the following formula: 60% (volume fraction) of analytical grade anhydrous acetic acid; 40% (volume fraction) of analytical grade methanol.

[0036] S2. Take photos of the areas damaged by foreign objects before sampling.

[0037] S3. Use 120 μm thick transparent AC test paper, cut 20 mm long AC paper, use a glass dropper to absorb an appropriate amount of replicating reagent, add 2 drops of replicating reagent on one side of the AC paper, gently shake the AC paper until its surface is fully wetted, and then use an ear bulb to blow off the excess replicating reagent on the surface of the AC paper.

[0038] S4. After waiting for 1 second, the AC paper becomes soft and sticky. Immediately stick the moistened side of the AC paper to the area to be inspected. Press firmly with your fingertips to make the AC paper fit tightly and fully contact the surface of the area to be inspected. After sticking the AC paper, take another photo.

[0039] S5. After waiting for 30 minutes, remove the AC paper. Provide the electronic version of the photo and the AC paper for extracting foreign objects at the same time when submitting for inspection. Example 3

[0040] A replica sampling method for aircraft foreign object damage inspection comprises the following steps: S1. Prepare the replica reagent for aircraft foreign object damage inspection according to the following formula: 70% (volume fraction) of analytically pure anhydrous acetic acid; 30% (volume fraction) of analytically pure isopropanol.

[0041] S2. Take photos of the areas damaged by foreign objects before sampling.

[0042] S3. Use 80 μm thick transparent AC test paper, cut 15 mm long AC paper, use a glass dropper to absorb an appropriate amount of replicating reagent, add 1 drop of replicating reagent on one side of the AC paper, gently shake the AC paper until its surface is fully wetted, and then use an ear bulb to blow off the excess replicating reagent on the surface of the AC paper.

[0043] S4. After waiting for 1 second, the AC paper becomes soft and sticky. Immediately stick the moistened side of the AC paper to the area to be inspected. Press firmly with your fingertips to make the AC paper fit tightly and fully contact the surface of the area to be inspected. After sticking the AC paper, take another photo.

[0044] S5. After waiting for 60 minutes, remove the AC paper. Provide the electronic version of the photo and the AC paper for extracting foreign objects at the same time when submitting for inspection. Example 4

[0045] A replica sampling method for aircraft foreign object damage inspection comprises the following steps: S1. Prepare the replica reagent for aircraft foreign object damage inspection according to the following formula: 55% (volume fraction) of analytically pure anhydrous acetic acid; 45% (volume fraction) of analytically pure ethyl acetate.

[0046] S2. Take photos of the areas damaged by foreign objects before sampling.

[0047] S3. Use 90 μm thick transparent AC test paper, cut 15 mm long AC paper, use a glass dropper to absorb an appropriate amount of replicating reagent, add 2 drops of replicating reagent on one side of the AC paper, gently shake the AC paper until its surface is fully wetted, and then use an ear bulb to blow off the excess replicating reagent on the surface of the AC paper.

[0048] S4. After waiting for 1 second, the AC paper becomes soft and sticky. Immediately stick the moistened side of the AC paper to the area to be inspected. Press firmly with your fingertips to make the AC paper fit tightly and fully contact the surface of the area to be inspected. After sticking the AC paper, take another photo.

[0049] S5. After waiting for 25 minutes, remove the AC paper. Provide the electronic version of the photo and the AC paper for extracting foreign objects at the same time when submitting for inspection. Example 5

[0050] A replica sampling method for aircraft foreign object damage inspection comprises the following steps: S1. Prepare the replica reagent for aircraft foreign object damage inspection according to the following formula: 65% (volume fraction) of analytically pure anhydrous acetic acid; 35% (volume fraction) of analytically pure methyl acetate.

[0051] S2. Take photos of the areas damaged by foreign objects before sampling.

[0052] S3. Use 110 μm thick transparent AC test paper, cut 20 mm long AC paper, use a glass dropper to absorb an appropriate amount of replicating reagent, add 2 drops of replicating reagent on one side of the AC paper, gently shake the AC paper until its surface is fully wetted, and then use an ear bulb to blow off the excess replicating reagent on the surface of the AC paper.

[0053] S4. After waiting for 2 seconds, the AC paper becomes soft and sticky. Immediately stick the moistened side of the AC paper to the area to be inspected. Press firmly with your fingertips to make the AC paper fit tightly and fully contact the surface of the area to be inspected. After sticking the AC paper, take another photo.

[0054] S5. After waiting for 50 minutes, remove the AC paper. Provide the electronic version of the photo and the AC paper for extracting foreign objects at the same time when submitting for inspection.

[0055] Compared with the replication method using AC paper + acetone reagent, the replication reagent provided in this application contains two components, and the volatilization speed of the reagent can be adjusted by adjusting the ratio of the two components, thereby avoiding the current situation where the AC paper is not tightly attached due to the acetone reagent volatilizing too quickly. In addition, compared with acetone, the reagent combination of acetic acid and ethanol provided in this application is less toxic, and the safety of transportation, storage and use is greatly improved.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A replicating reagent for foreign object damage detection in aircraft, characterized in that: The components of the complexing reagent include a volatile reagent and anhydrous acetic acid; The volatile reagent includes at least one of a volatile alcohol reagent and a volatile ester reagent.

2. The replica reagent for aircraft foreign object damage detection according to claim 1, characterized in that: The volatile ester reagent includes at least one of methyl acetate and ethyl acetate.

3. The replica reagent for aircraft foreign object damage detection according to claim 1, characterized in that: The volatile alcohol reagent includes at least one of methanol, ethanol and propanol.

4. The replica reagent for aircraft foreign object damage detection according to claim 1, characterized in that: In the complex reagent, the volume fraction of the anhydrous acetic acid is 50%-70%, and the remainder is the volatile reagent.

5. The replica reagent for aircraft foreign object damage detection according to claim 1, characterized in that: The concentration of the volatile agent is greater than or equal to 95 wt %, and the concentration of the anhydrous acetic acid is greater than or equal to 99 wt %.

6. A replica sampling method for aircraft foreign object damage inspection, characterized in that: include: Wetting the acetate paper with the complexing reagent described in any one of claims 1 to 5; Foreign objects on the aircraft's inspection area are extracted using moistened acetate paper.

7. The replica sampling method for aircraft foreign object damage inspection according to claim 6, characterized in that: The thickness of the acetate paper is 80-120 μm.

8. The replica sampling method for aircraft foreign object damage inspection according to claim 6, characterized in that: The length of the acetate paper is 15-25 mm.

9. The replica sampling method for aircraft foreign object damage inspection according to claim 6, characterized in that: The method of wetting the acetate paper with the replica reagent according to any one of claims 1 to 5 and extracting foreign matter from the inspection area of ​​the aircraft with the wetted acetate paper comprises: Add the replicating reagent to one side of the acetate paper, shake the acetate paper until its surface is moistened, stick the moistened side of the acetate paper to the area to be tested, press the acetate paper to make it fit tightly to the surface of the area to be tested, and then remove the acetate paper.

10. The replica sampling method for aircraft foreign object damage inspection according to claim 9, characterized in that: After the acetate paper is pressed to closely fit the surface of the inspection area, wait for 15-60 minutes and then remove the acetate paper.