CN116793599B - Gas leakage detecting agent and preparation method thereof - Google Patents
Gas leakage detecting agent and preparation method thereof Download PDFInfo
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- CN116793599B CN116793599B CN202310793493.8A CN202310793493A CN116793599B CN 116793599 B CN116793599 B CN 116793599B CN 202310793493 A CN202310793493 A CN 202310793493A CN 116793599 B CN116793599 B CN 116793599B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 90
- 238000001514 detection method Methods 0.000 claims abstract description 55
- 239000000203 mixture Substances 0.000 claims abstract description 41
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 35
- 229930195729 fatty acid Natural products 0.000 claims abstract description 35
- 239000000194 fatty acid Substances 0.000 claims abstract description 35
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 23
- 238000005260 corrosion Methods 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000003112 inhibitor Substances 0.000 claims abstract description 21
- 239000004088 foaming agent Substances 0.000 claims abstract description 20
- 150000004668 long chain fatty acids Chemical class 0.000 claims abstract description 19
- 150000004667 medium chain fatty acids Chemical class 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000008367 deionised water Substances 0.000 claims abstract description 9
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims description 16
- 229920002385 Sodium hyaluronate Polymers 0.000 claims description 15
- 229940010747 sodium hyaluronate Drugs 0.000 claims description 15
- YWIVKILSMZOHHF-QJZPQSOGSA-N sodium;(2s,3s,4s,5r,6r)-6-[(2s,3r,4r,5s,6r)-3-acetamido-2-[(2s,3s,4r,5r,6r)-6-[(2r,3r,4r,5s,6r)-3-acetamido-2,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-2-carboxy-4,5-dihydroxyoxan-3-yl]oxy-5-hydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3,4,5-trihydroxyoxane-2- Chemical compound [Na+].CC(=O)N[C@H]1[C@H](O)O[C@H](CO)[C@@H](O)[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@H](O[C@H]2[C@@H]([C@@H](O[C@H]3[C@@H]([C@@H](O)[C@H](O)[C@H](O3)C(O)=O)O)[C@H](O)[C@@H](CO)O2)NC(C)=O)[C@@H](C(O)=O)O1 YWIVKILSMZOHHF-QJZPQSOGSA-N 0.000 claims description 15
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 102100021587 Embryonic testis differentiation protein homolog A Human genes 0.000 claims description 11
- 101000898120 Homo sapiens Embryonic testis differentiation protein homolog A Proteins 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims description 8
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims description 8
- 159000000000 sodium salts Chemical class 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 claims description 6
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 4
- 239000005639 Lauric acid Substances 0.000 claims description 4
- 235000021314 Palmitic acid Nutrition 0.000 claims description 4
- 108010020346 Polyglutamic Acid Proteins 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 4
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 4
- 239000012964 benzotriazole Substances 0.000 claims description 4
- 235000015165 citric acid Nutrition 0.000 claims description 4
- 235000011090 malic acid Nutrition 0.000 claims description 4
- 239000001630 malic acid Substances 0.000 claims description 4
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims description 4
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 claims description 4
- 229920002643 polyglutamic acid Polymers 0.000 claims description 4
- 229940057950 sodium laureth sulfate Drugs 0.000 claims description 4
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 4
- 229940048109 sodium methyl cocoyl taurate Drugs 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 4
- SXHLENDCVBIJFO-UHFFFAOYSA-M sodium;2-[2-(2-dodecoxyethoxy)ethoxy]ethyl sulfate Chemical compound [Na+].CCCCCCCCCCCCOCCOCCOCCOS([O-])(=O)=O SXHLENDCVBIJFO-UHFFFAOYSA-M 0.000 claims description 4
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 3
- 239000005635 Caprylic acid (CAS 124-07-2) Substances 0.000 claims description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- 229920000805 Polyaspartic acid Polymers 0.000 claims description 2
- 108010039918 Polylysine Proteins 0.000 claims description 2
- 235000021355 Stearic acid Nutrition 0.000 claims description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 2
- 229960002446 octanoic acid Drugs 0.000 claims description 2
- 108010064470 polyaspartate Proteins 0.000 claims description 2
- 229920000656 polylysine Polymers 0.000 claims description 2
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims description 2
- 239000004299 sodium benzoate Substances 0.000 claims description 2
- 235000010234 sodium benzoate Nutrition 0.000 claims description 2
- PWZDAQKVUDZPRI-LMOVPXPDSA-M sodium;(4s)-4-amino-5-oxo-5-tetradecoxypentanoate Chemical compound [Na+].CCCCCCCCCCCCCCOC(=O)[C@@H](N)CCC([O-])=O PWZDAQKVUDZPRI-LMOVPXPDSA-M 0.000 claims description 2
- 239000008117 stearic acid Substances 0.000 claims description 2
- 239000011975 tartaric acid Substances 0.000 claims description 2
- 235000002906 tartaric acid Nutrition 0.000 claims description 2
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 claims description 2
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 claims 1
- SOBHUZYZLFQYFK-UHFFFAOYSA-K trisodium;hydroxy-[[phosphonatomethyl(phosphonomethyl)amino]methyl]phosphinate Chemical compound [Na+].[Na+].[Na+].OP(O)(=O)CN(CP(O)([O-])=O)CP([O-])([O-])=O SOBHUZYZLFQYFK-UHFFFAOYSA-K 0.000 claims 1
- 238000005187 foaming Methods 0.000 abstract description 16
- 230000008595 infiltration Effects 0.000 abstract description 7
- 238000001764 infiltration Methods 0.000 abstract description 7
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 4
- 238000004220 aggregation Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 19
- 230000000694 effects Effects 0.000 description 9
- 238000011084 recovery Methods 0.000 description 8
- 229920000742 Cotton Polymers 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 5
- 235000021360 Myristic acid Nutrition 0.000 description 5
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 5
- 239000006260 foam Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 239000003002 pH adjusting agent Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 3
- 229910021642 ultra pure water Inorganic materials 0.000 description 3
- 239000012498 ultrapure water Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 2
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 2
- 239000013522 chelant Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- WCDDVEOXEIYWFB-VXORFPGASA-N (2s,3s,4r,5r,6r)-3-[(2s,3r,5s,6r)-3-acetamido-5-hydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4,5,6-trihydroxyoxane-2-carboxylic acid Chemical compound CC(=O)N[C@@H]1C[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](C(O)=O)O[C@@H](O)[C@H](O)[C@H]1O WCDDVEOXEIYWFB-VXORFPGASA-N 0.000 description 1
- QZKRHPLGUJDVAR-UHFFFAOYSA-K EDTA trisodium salt Chemical compound [Na+].[Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O QZKRHPLGUJDVAR-UHFFFAOYSA-K 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003354 benzotriazolyl group Chemical group N1N=NC2=C1C=CC=C2* 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229940014041 hyaluronate Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water
Abstract
The application relates to the field of tightness detection reagents, and particularly discloses a gas leakage detecting agent and a preparation method thereof, wherein the gas leakage detecting agent comprises 0.4-0.6 part of fatty acid mixture, 0.6-0.8 part of foaming agent, 0.1-0.2 part of corrosion inhibitor, 0.1-0.2 part of pH regulator and deionized water, wherein the fatty acid mixture is obtained by mixing medium-chain fatty acid and long-chain fatty acid; utilize fatty acid mixture to improve the infiltration performance of this application and adjust the surface tension of this application, when using this application to carry out pipeline leak hunting, the foaming duration is long, and the bubble size is little, and the aggregation bubble is few, is favorable to pinpointing the leak source.
Description
Technical Field
The application relates to the field of tightness detection reagents, in particular to a gas leakage detection reagent and a preparation method thereof.
Background
The gas leakage detecting agent is used for detecting gas leakage in the parts of valves, welding seams and the like on the gas transmission pipeline. During detection, the gas leakage detecting agent is sprayed on a position to be detected, and if gas leakage exists, obvious visible bubbles are formed at the leakage point, so that the leakage point can be rapidly positioned.
In order to facilitate repair welding of the leakage points of the welding seams of the gas pipeline by operators, the leakage points are usually required to be accurately positioned when the welding seams of the gas pipeline are subjected to leak detection.
In the prior art, when the leak detection agent is sprayed on a position to be detected, bubbles continuously emerge from the leakage point, a plurality of bubbles are gathered together to form foam, and the foam covers the leakage point and the peripheral area thereof, so that operators cannot observe the position of the leakage point conveniently, and the positioning of the leakage point is inaccurate.
Disclosure of Invention
To the not enough that prior art exists, the first aim at of this application provides a gas leak hunting agent, and it is used for when gas leakage detects, and the bubble that emerges from the leakage point is difficult for gathering to form the foam, and the operating personnel of being convenient for observes the position of leakage point, carries out accurate location to the leakage point.
The second object of the present application is to provide a method for preparing a gas leak detection agent, which has simple steps and is easy to implement.
In order to achieve the first object, the present application provides the following technical solutions:
the gas leak detection agent is prepared from the following raw materials in parts by weight: the gas leak detection agent is prepared from the following raw materials in parts by weight: 0.4-0.6 part of fatty acid mixture, 0.6-0.8 part of foaming agent, 0.1-0.2 part of corrosion inhibitor and 0.1-0.2 part of pH regulator, and the total weight is complemented to 100 parts by deionized water; the fatty acid mixture includes medium chain fatty acids and long chain fatty acids.
By adopting the technical scheme, the gas leakage detecting agent provided by the application is sprayed on the surface of the pipeline to be detected, if a leakage point exists on the surface of the pipeline, gas in the pipeline escapes from the leakage point, and the foaming agent enables the gas leakage detecting agent to be easy to foam, so that bubbles visible to naked eyes are generated at the leakage point, and the bubbles are changed from small to large until the bubbles are broken; the fatty acid mixture composed of the medium-chain fatty acid and the long-chain fatty acid can improve the infiltration performance of the gas leakage detecting agent, and after the bubbles are broken, the gas leakage detecting agent can timely cover the leakage point again until the next bubble is generated, so that the bubbles can continuously escape from the leakage point; on the other hand, the fatty acid mixture composed of medium-chain fatty acid and long-chain fatty acid adjusts the surface tension of the gas leakage detecting agent, so that the size of bubbles is smaller, the service life of the bubbles is moderate, when the latter bubbles emerge from the leakage point, the former bubbles can be timely broken, the aggregation of the bubbles is reduced, a large number of bubbles are prevented from forming bubbles to cover the leakage point, and therefore, the accurate positioning of the leakage point is facilitated.
Further, the fatty acid mixture is prepared from medium chain fatty acid and long chain fatty acid according to the weight ratio of (1.1-1.3): 1, wherein the medium-chain fatty acid is selected from one or more of caprylic acid, capric acid and lauric acid, and the long-chain fatty acid is selected from one or more of myristic acid, palmitic acid and stearic acid.
By adopting the technical scheme, the medium-chain fatty acid is the fatty acid with the carbon number of 6-12, and the long-chain fatty acid is the fatty acid with the carbon number of more than 12, and the medium-chain fatty acid and the long-chain fatty acid are matched with each other, so that the infiltration performance of the gas leakage detecting agent is improved, and the surface tension of the gas leakage detecting agent is regulated to a proper range.
Further, the foaming agent is selected from one or more of sodium methyl cocoyl taurate, sodium laureth sulfate and sodium myristyl glutamate.
By adopting the technical scheme, the foaming agent is a surfactant, so that the surface tension of water can be reduced, and the gas leakage detecting agent is easy to foam.
Further, the corrosion inhibitor is selected from one or more of benzotriazole, sodium metasilicate and sodium benzoate, and the pH regulator is selected from one or more of citric acid, malic acid and tartaric acid.
By adopting the technical scheme, the corrosion inhibitor can reduce the corrosion of the gas leak detection agent to the surface of the pipeline; the pH regulator and other components in the gas leakage detecting agent form a buffer system, and the pH of the gas leakage detecting agent is regulated to maintain the surface tension of the gas leakage detecting agent in a proper range.
Further, the raw materials for preparing the gas leak detection agent also comprise 0.18-0.22 part by weight of ETDA sodium salt, wherein the ETDA sodium salt is selected from one or more of disodium EDTA, trisodium EDTA and tetrasodium EDTA.
By adopting the technical scheme, the ETDA sodium salt can chelate metal ions in the gas leakage detecting agent, so that the foaming performance of the gas leakage detecting agent is improved.
Further, the raw materials for preparing the gas leak detection agent also comprise 0.8-1 weight part of regulator, wherein the regulator comprises one or two of polyamino acid and sodium hyaluronate, and the polyamino acid is selected from one or more of polyglutamic acid, polylysine and polyaspartic acid.
Further, the regulator is prepared from polyamino acid and sodium hyaluronate according to the weight ratio of (0.55-0.65): (0.25-0.35) and mixing.
By adopting the technical scheme, the polyamino acid and the hyaluronate cooperate with each other, so that the wettability of the gas leakage detecting agent is further improved, the duration of foaming is prolonged, and the gas leakage detecting agent is also easier to erase from the surface of a pipeline.
In order to achieve the second object, the present application provides the following technical solutions:
a preparation method of a gas leak detection agent comprises the following steps:
s1, mixing a fatty acid mixture, a foaming agent, a pH regulator and deionized water;
s2, adding a corrosion inhibitor and other raw materials into the mixture obtained in the step S1, and mixing to obtain the gas leak detection agent.
Further, in the step S1, the mixing condition is that stirring is carried out for 2-3h at 35-40 ℃: in the step S2, the mixing condition is that stirring is carried out for 1-2h at 40-45 ℃.
By adopting the technical scheme, the fatty acid mixture, the foaming agent and the pH regulator are fully dispersed in water, and then the corrosion inhibitor and other raw materials are added, so that uniform mixing of the components is facilitated.
In summary, the present application includes the following beneficial technical effects:
1. the application provides a gas leakage detecting agent, which improves the infiltration performance of the gas leakage detecting agent through a fatty acid mixture composed of medium-chain fatty acid and long-chain fatty acid, is favorable for bubbles to continuously escape from a leakage point, and simultaneously, the fatty acid mixture composed of the medium-chain fatty acid and the long-chain fatty acid adjusts the surface tension of the gas leakage detecting agent, so that the size of the bubbles is smaller, the service life of the bubbles is moderate, and when the latter bubbles emerge from the leakage point, the former bubbles can be timely broken, thereby reducing the aggregation of the bubbles and being convenient for accurately positioning the leakage point;
2. the infiltration performance of the gas leakage detecting agent is further improved by adding EDTA sodium salt, polyamino acid and sodium hyaluronate, and the foaming duration time is prolonged to more than 8 min; meanwhile, the surface tension of the gas leakage detecting agent is further regulated, the number of the accumulated bubbles is reduced to 2, the size of the bubbles is reduced to 2-3mm, and the observation of the positions of leakage points to operators is facilitated;
3. the application provides a gaseous leak hunting agent, the rate of recovery of wiping on stainless steel, copper, PVC plastic surface reaches more than 92%, in actual operation, after the leak hunting operation is accomplished, uses wet cloth to wipe the surface of pipeline, erases the gaseous leak hunting agent that the pipeline surface is attached easily to reduce gaseous leak hunting agent and remain on the pipeline surface, help avoiding the pipeline to corrode.
Detailed Description
The present application is described in further detail below with reference to examples. The following examples are only illustrative of the present invention and should not be construed as limiting the scope of the invention. The following examples are conducted under conventional conditions or conditions recommended by the manufacturer, and the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available unless otherwise specified. Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any method or material similar or equivalent to those described may be used in the present invention.
Examples 1 to 3
Examples 1-3 each provide a gas leak detector.
Examples 1-3 differ in the weight parts of fatty acid mixture and deionized water in the materials used to prepare the gas leak detector, as shown in Table 1.
The preparation method of the gas leak detection agent comprises the following steps:
1) Mixing a fatty acid mixture, a foaming agent and a pH regulator with deionized water, and stirring for 2.5 hours at 37 ℃, wherein the fatty acid mixture is obtained by mixing capric acid and myristic acid according to a weight ratio of 1.2:1, the foaming agent is sodium methyl cocoyl taurate, and the pH regulator is citric acid;
2) Adding a corrosion inhibitor into the mixture obtained in the step 1), and stirring for 1.5 hours at 42 ℃ to obtain a gas leakage detecting agent; wherein the corrosion inhibitor is benzotriazole.
Table 1 examples 1-3 provide examples of gas leak detection agents having parts by weight of each component
Example 4
Example 4 provides a gas leak detection agent, the raw materials and the preparation method refer to example 2, and the difference between example 4 and example 2 is that in step 1), a fatty acid mixture is obtained by mixing capric acid and myristic acid according to a weight ratio of 1.1:1.
Example 5
Example 5 provides a gas leak detection agent, the raw materials and the preparation method refer to example 2, and the difference between example 5 and example 2 is that in step 1), a fatty acid mixture is obtained by mixing capric acid and myristic acid according to a weight ratio of 1.3:1.
Example 6
Example 6 provides a gas leak detection agent, the preparation method refers to example 2, and the difference between example 6 and example 2 is that in step 1), a fatty acid mixture is obtained by mixing lauric acid and palmitic acid according to a weight ratio of 1.2:1.
Examples 7 to 8
Examples 7-8 provide a gas leak detection agent, respectively, raw materials and preparation method referring to example 2, examples 7-8 differ from example 2 in that the raw materials used for preparing the gas leak detection agent differ in parts by weight of foaming agent, corrosion inhibitor and pH adjuster, as shown in table 2, in particular.
Table 2 examples 7-8 provide examples of gas leak detection agents having parts by weight of each component
Example 9
Example 9 provides a gas leak detection agent, the preparation method refers to example 2, and the difference between example 9 and example 2 is that the foaming agent is sodium laureth sulfate, the corrosion inhibitor is sodium metasilicate, and the pH regulator is malic acid.
Example 10
Example 10 provides a gas leak detection agent prepared according to example 2. Example 10 differs from example 2 in that in step 2), 0.2 parts by weight of disodium EDTA is also added.
Example 11
Example 11 provides a gas leak detection agent, the method of preparation referring to example 10, example 11 differing from example 10 in that in step 2), 0.6 parts by weight of polyglutamic acid is also added.
Example 12
Example 12 provides a gas leak detection agent, the method of preparation referring to example 10, example 12 differs from example 10 in that in step 2), 0.3 parts by weight of sodium hyaluronate is also added.
Example 13
Example 13 provides a gas leak detection agent, the method of preparation referring to example 10, example 13 differing from example 10 in that in step 2) 0.6 parts by weight of polyglutamic acid and 0.3 parts by weight of sodium hyaluronate are also added.
Comparative example 1
Comparative example 1 a gas leak detector was provided and the method of preparation was as described in example 2, with comparative example 1 differing from example 2 in that in step 1) no fatty acid mixture was added.
Comparative example 2
Comparative example 2 a gas leak detector was provided and the method of preparation was as described in example 2, comparative example 2 differing from example 2 in that in step 1), the fatty acid mixture contained only myristic acid.
Comparative example 3
Comparative example 3 provides a gas leak detector prepared according to example 2, the comparative example 3 differing from example 2 in that in step 1), the fatty acid mixture contains only capric acid.
Comparative example 4
Comparative example 4 provides a gas leak detection agent, the raw materials refer to example 2, and the preparation method is specifically as follows:
1) Mixing the fatty acid mixture, the foaming agent, the corrosion inhibitor and deionized water, and stirring for 2.5h at 37 ℃;
2) And (2) adding a pH regulator into the mixture obtained in the step (1), and stirring for 1.5h at 42 ℃ to obtain the gas leak detection agent.
Performance detection
1. Foaming performance detection: for the gas leakage detecting agents provided in examples 1 to 13 and comparative examples 1 to 4 of the present application, foaming performance was detected by the following method:
1) Taking a DN100 seamless steel pipe as a pipeline to be detected, wherein the nominal outer diameter of the pipeline is 108mm, the wall thickness is 4.0mm, and the inner diameter is 100mm; the walls of the pipes were perforated using a laser-perforating machine with a pore size of 0.01mm. During detection, air is introduced into a pipeline to be detected, and the air source pressure is 1000Pa;
2) The gas leak detection agents provided in examples 1-13 and comparative examples 1-4 of the present application were respectively charged into aerosol cans, respectively sprayed onto the perforated portions of the pipes to be detected, and foaming conditions were observed, including the following indexes:
foaming duration: starting timing from the first bubble generated at the leakage point to ending timing when no bubble is generated at the leakage point;
bubble diameter: the diameter of the largest bubble before collapse;
number of aggregated bubbles: the maximum number of bubbles that are gathered together, the number of bubbles that are gathered being recorded if the number of bubbles that are gathered is not more than 20, and the number of bubbles that are gathered being recorded as ">20".
2. And (3) wiping recovery rate detection: for the gas leak detection agents provided in examples 1-13 and comparative examples 1-4 of the present application, the wiping recovery rate was measured as follows:
1) The experimental group samples were prepared as follows: 1-1) at an area of 10X 10cm 2 Uniformly coating 0.1mL of gas leakage detecting agent on a stainless steel plate, a copper plate and a PVC plastic plate respectively, repeatedly preparing 3 parts of plates made of each material, and naturally airing;
1-2) measuring 10mL of ultrapure water in a test tube, taking a cotton swab, wetting the cotton swab head by the ultrapure water in the test tube, and squeezing the superfluous water on the cotton swab head on the inner wall of the test tube;
1-3) contacting the tip of the swab with the surface of the plate coated with the gas leak detection agent at a coating position of 10X 10cm 2 Firstly, carrying out parallel scribing on one side of a cotton swab head, and then carrying out parallel scribing on the other side of the cotton swab head perpendicular to the original scribing direction; 1-4) cutting off the cotton swab rod, enabling the cotton swab head to fall into a test tube filled with water, adding a plug, performing ultrasonic treatment for 10min, and shaking uniformly;
1-5) the wiping recovery test for each material sheet was performed by 3 different operators.
2) Control samples were prepared as follows:
taking 0.1mL of gas leak detection agent, adding ultrapure water to a constant volume of 10mL, and uniformly mixing.
3) The total organic carbon content (TOC) of the experimental and control group samples was measured using a total organic carbon detector.
4) Calculating average values of detection results of 3 repeated samples of each material, and respectively calculating wiping recovery rate of the surface gas leak detection agent of each material;
wiping recovery = experimental TOC ≡control TOC x 100%.
The test data are shown in Table 3.
TABLE 3 foaming duration, cell diameter, number of aggregated cells and wiping recovery rate test result data tables for examples 1 to 13 and comparative examples 1 to 4
The present application will be described in detail with reference to the detection data provided in table 3.
Examples 1-3 examined the effect of the amount of fatty acid mixture added on the performance of the gas leak detector, and the results showed that varying the amount of fatty acid mixture added had a slight effect on the performance of the gas leak detector, but both satisfied the use requirements, and example 2 was relatively superior.
In comparison with example 2, examples 4-5 examined the effect of the ratio of medium-chain fatty acids to long-chain fatty acids in the fatty acid mixture on the performance of the gas leak detection agent, and the results show that changing the ratio of medium-chain fatty acids to long-chain fatty acids in the fatty acid mixture has a slight effect on the performance of the gas leak detection agent, but can meet the use requirements, and example 2 is relatively superior.
In example 2, as a comparison, the medium-chain fatty acid and the long-chain fatty acid in the fatty acid mixture are changed, and the result shows that the medium-chain fatty acid is replaced by lauric acid, the long-chain fatty acid is replaced by myristic acid and palmitic acid, so that the performance of the gas leak detection agent is slightly influenced, but the use requirement can be met, and the example 2 is relatively good.
In comparison with example 2, examples 7-8 examined the effect of the addition amounts of the foaming agent, the corrosion inhibitor and the pH regulator on the performance of the gas leakage detecting agent, and the results show that changing the addition amounts of the foaming agent, the corrosion inhibitor and the pH regulator has a slight effect on the performance of the gas leakage detecting agent, but can meet the use requirements, and example 2 is relatively superior.
In comparison with example 2, example 9 changed the types of foaming agent, corrosion inhibitor and pH regulator, and the results showed that the foaming agent was replaced by sodium methyl cocoyl taurate with sodium laureth sulfate, the corrosion inhibitor was replaced by benzotriazole with sodium metasilicate, and the pH regulator was replaced by citric acid with malic acid, which had a slight effect on the foaming performance of the gas leak detector, but still satisfied the use requirements, and example 2 was relatively superior.
On the basis of the embodiment 2, the EDTA sodium salt is added into the gas leakage detecting agent in the embodiment 10, and the ETDA sodium salt can chelate metal ions in the gas leakage detecting agent, so that the foaming performance of the gas leakage detecting agent is improved, and the detection result of the embodiment 10 is better than that of the embodiment 2.
Based on example 10, example 11 adds polyamino acid to the gas leakage detecting agent, example 12 adds sodium hyaluronate to the gas leakage detecting agent, and both the polyamino acid and the sodium hyaluronate can improve the infiltration performance of the gas leakage detecting agent, and adjust the surface tension of the gas leakage detecting agent, so that the foaming performance of the gas leakage detecting agent is improved.
Based on the embodiment 10, the embodiment 13 adds the polyamino acid and the sodium hyaluronate into the gas leakage detecting agent at the same time, and the results of the embodiments 11 and 12 show that the polyamino acid and the sodium hyaluronate cooperate to obviously improve the foaming performance of the gas leakage detecting agent. This is because, on the one hand, the polyamino acid and sodium hyaluronate together improve the wetting properties of the gas leak detector, thereby helping to extend the foaming duration; on the other hand, the polyamino acid and the sodium hyaluronate regulate the surface tension of the gas leakage detecting agent, so that the quantity of aggregated bubbles is further reduced, the size of the bubbles is reduced, and the smaller the quantity of aggregated bubbles is, the smaller the size of the bubbles is, so that the leakage point is more easily and accurately positioned.
In addition, in example 13, the wiping recovery rate of the gas leak detection agent on the surfaces of three different materials all reached 92% or more. In actual operation, after the leak detection operation is finished, wet cloth is used for wiping the surface of the pipeline, so that the gas leak detection agent attached to the surface of the pipeline is easy to erase, the residue of the gas leak detection agent on the surface of the pipeline is reduced, and the pipeline corrosion is avoided.
Compared with example 2, the foaming performance of the gas leakage detecting agent of comparative example 1 is obviously deteriorated, the foaming duration time is shortened, the bubble diameter is increased, the number of aggregated bubbles is increased, and the accurate positioning of leakage points is not facilitated, which shows that the addition of the fatty acid mixture can obviously improve the infiltration performance of the gas leakage detecting agent and effectively regulate the surface tension of the gas leakage detecting agent.
The results of the tests of comparative examples 2 and 3 are superior to comparative example 1, but inferior to example 2, showing that the addition of medium chain fatty acid alone or long chain fatty acid alone is insufficient to achieve effective adjustment of the wettability and surface tension of the gas leak detector, and that significant improvement in the gas leak detector performance can be achieved only by the combination of medium chain fatty acid and long chain fatty acid.
The test results of example 2 are superior to comparative example 4, which demonstrates that the order of addition of the corrosion inhibitor and the pH adjuster has an effect on the performance of the gas leak detector, and that the addition of the pH adjuster followed by the corrosion inhibitor facilitates uniform mixing of the components in the gas leak detector.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (8)
1. A gas leak detection agent, characterized in that: the gas leak detection agent is prepared from the following raw materials in parts by weight: 0.4-0.6 part of fatty acid mixture, 0.6-0.8 part of foaming agent, 0.1-0.2 part of corrosion inhibitor, 0.1-0.2 part of pH regulator, 0.18-0.22 part of ETDA sodium salt, 0.8-1 part of mixture of polyamino acid and sodium hyaluronate, and the total weight of the mixture is complemented to 100 parts by deionized water; the fatty acid mixture comprises medium chain fatty acids and long chain fatty acids;
the fatty acid mixture is prepared from medium-chain fatty acid and long-chain fatty acid according to the weight ratio of (1.1-1.3): 1, mixing to obtain the product;
the medium-chain fatty acid is selected from one or more of caprylic acid, capric acid and lauric acid, and the long-chain fatty acid is selected from one or more of myristic acid, palmitic acid and stearic acid;
the gas leak detection agent is prepared by the following preparation method, which comprises the following steps:
s1, mixing a fatty acid mixture, a foaming agent, a pH regulator and deionized water;
s2, adding a mixture of a corrosion inhibitor, ETDA sodium salt, polyamino acid and sodium hyaluronate into the mixture obtained in the step S1, and mixing to obtain the gas leak detection agent.
2. The gas leak detector as defined in claim 1, wherein: the foaming agent is one or more selected from sodium methyl cocoyl taurate, sodium laureth sulfate and sodium myristyl glutamate.
3. The gas leak detector as defined in claim 1, wherein: the corrosion inhibitor is one or more selected from benzotriazole, sodium metasilicate and sodium benzoate, and the pH regulator is one or more selected from citric acid, malic acid and tartaric acid.
4. The gas leak detector as defined in claim 1, wherein: the ETDA sodium salt is one or more selected from ETDA disodium, ETDA trisodium and ETDA tetrasodium.
5. The gas leak detector as defined in claim 1, wherein: the polyamino acid is selected from one or more of polyglutamic acid, polylysine and polyaspartic acid.
6. The gas leak detector as defined in claim 5, wherein: polyamino acid and sodium hyaluronate in weight ratio (0.55-0.65): (0.25-0.35).
7. A method for preparing a gas leak detection agent as defined in any one of claims 1 to 6, comprising the steps of:
s1, mixing a fatty acid mixture, a foaming agent, a pH regulator and deionized water;
s2, adding a corrosion inhibitor, ETDA sodium salt, polyamino acid and sodium hyaluronate into the mixture obtained in the step S1, and mixing to obtain the gas leak detection agent.
8. The method for preparing a gas leak detection agent according to claim 7, wherein: in the step S1, the mixing condition is that stirring is carried out for 2-3h at the temperature of 35-40 ℃: in the step S2, the mixing condition is that stirring is carried out for 1-2h at 40-45 ℃.
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