Hydrogen sulfide detection agent

Abstract

A hydrogen sulfide detection agent includes a polymer material as a substrate, a colorant configured to develop color by contact with hydrogen sulfide, and a color development promoter configured to promote color development of the colorant.

Description

Technical Field

[0001] This disclosure relates to techniques for detecting hydrogen sulfide. Background Technology

[0002] Hydrogen sulfide is harmful to humans and corrodes or degrades metals and resins. Therefore, the detection of hydrogen sulfide is important. As a technique for detecting hydrogen sulfide, a sensor is used, which applies changes in the electrical or thermal properties caused by the contact of hydrogen sulfide with a component. However, a continuous power supply is required to operate the sensor.

[0003] On the other hand, as a type that does not require electricity, there are techniques for identifying the presence or absence of hydrogen sulfide by using a material that changes color upon contact with hydrogen sulfide. For example, Patent Document 1 proposes a gas detector in which a metal compound for reacting with hydrogen sulfide and developing color is dispersed in a substrate made of a polymer material. Furthermore, Patent Document 2 proposes a method in which the concentration of detectable hydrogen sulfide gas can be controlled based on the permeability of the membrane by using a membrane permeable to hydrogen sulfide gas.

[0004] Related technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application, Publication No. 2020-508434

[0007] Patent Document 2: Japanese Patent No. 4133640 Summary of the Invention

[0008] The problem to be solved by the present invention

[0009] However, in order to detect low concentrations of hydrogen sulfide using the techniques disclosed in Patent Document 1 or Patent Document 2, it is necessary to improve the detection capability of the detector. Therefore, it is necessary to increase the amount of metal compound; as a result, the cost of producing the detector is expected to increase. In view of the above, one aspect of this disclosure aims to detect low concentrations of hydrogen sulfide and control the colorant content.

[0010] Problem-solving methods

[0011] To address the aforementioned problems, a hydrogen sulfide detection agent according to one aspect of this disclosure comprises: a polymer material as a base, a colorant configured to develop color upon contact with hydrogen sulfide, and a color development promoter configured to promote the color development of the colorant. Attached Figure Description

[0012] Figure 1 The combination of materials contained in each sample in Experiment A and photographs of them before and after color development are shown.

[0013] Figure 2 The combination of materials contained in each sample in Experiment B and the color difference before and after color development are shown. Detailed Implementation

[0014] According to one embodiment of the present disclosure, a hydrogen sulfide detection agent comprises: a colorant in a polymer material serving as a base that develops color upon contact with hydrogen sulfide, and a color development promoter for promoting the color development of the colorant.

[0015] The hydrogen sulfide detection agent according to this embodiment is used to determine the presence or absence of hydrogen sulfide. For example, in an electric vehicle equipped with an all-solid-state battery containing sulfides as a solid electrolyte, the hydrogen sulfide detection agent according to this embodiment is placed near the all-solid-state battery. When the solid electrolyte containing sulfides leaks from the all-solid-state battery, the sulfide leakage can be detected by the color development of the hydrogen sulfide detection agent.

[0016] The hydrogen sulfide detector according to this embodiment targets, for example, hydrogen sulfide gas. Therefore, the hydrogen sulfide detector according to this embodiment can accurately detect whether a specific gas contains hydrogen sulfide. Furthermore, the concentration of hydrogen sulfide in a specific gas (the amount of hydrogen sulfide in the gas) can be detected based on the degree of color development of the hydrogen sulfide detector. It should be noted that the target of the hydrogen sulfide detector can be, for example, hydrogen sulfide dissolved in a liquid such as water.

[0017] Color development promoter

[0018] The colorimetric accelerator contained in the hydrogen sulfide detection reagent according to this embodiment will be described.

[0019] At least a portion of the hydrogen sulfide in contact with the hydrogen sulfide detection agent according to this embodiment is dissolved in the color-developing accelerator contained in the hydrogen sulfide detection agent. The inventors determined that the hydrogen sulfide (H2S) dissolved in the color-developing accelerator is ionized and reacts with the colorant after ionization. The inventors believe that, according to this embodiment, since most of the hydrogen sulfide rapidly dissolves in the color-developing accelerator, color development is easily achieved even when the colorant content is low. It should be noted that the statement "easily achieves color development" includes the meaning that the colorant develops color with high sensitivity even at low hydrogen sulfide concentrations, or that the colorant develops color rapidly upon contact with hydrogen sulfide.

[0020] There are no particular limitations on the type of color-developing accelerator; examples of color-developing accelerators include various types of oils. By adding oil to the polymer material constituting the substrate, the dissolution or penetration of hydrogen sulfide into the substrate is promoted; as a result, hydrogen sulfide is highly likely to encounter colorants in the substrate. Therefore, oils in which hydrogen sulfide can be sufficiently dissolved are suitable as color-developing accelerators.

[0021] For example, low molecular weight oils can be provided as examples of color development promoters. Low molecular weight oils are, for example, oils with a molecular weight of less than 10,000. More preferably, oils with a molecular weight of 5,000 or less (e.g., 1,000 or less) can be provided as examples of color development promoters.

[0022] Furthermore, polar oils can be given as an example of a color development accelerator. Polar oils are oils with molecules having a non-uniformly distributed polar polarity. Polar hydrogen sulfide dissolves more readily in polar oils than in a substrate made of non-polar polymer materials. Therefore, according to a configuration in which a polar oil is used as a color development accelerator, color development caused by colorants can be effectively promoted.

[0023] For example, examples of oils used as color development accelerators include silicone oil, ester oil, or process oil. Silicone oil is a non-polar oil. Ester oil is a polar oil. Process oil can be either polar or non-polar. The inventors have discovered that, depending on the configuration in which silicone oil, ester oil, or process oil is included in the color development accelerator, color development is easily achieved even at low colorant concentrations. It should be noted that various types of oils can be used as color development accelerators. For example, a mixture of two or more oils selected from silicone oil, ester oil, and process oil can be used as a color development accelerator.

[0024] The content of the color-developing accelerator in the hydrogen sulfide detection reagent can be freely selected; for example, based on 100 parts by weight of polymer material, the content of the color-developing accelerator is 0.1 parts by weight or more and 30 parts by weight or less. If the content of the color-developing accelerator in the polymer material is too high, it will be difficult to knead during the production process. On the other hand, if the content of the color-developing accelerator in the polymer material is too low, the colorant will be difficult to develop color. According to the configuration in which the content of the color-developing accelerator is 0.1 parts by weight or more and 30 parts by weight or less, both kneading and color development of the colorant during the production process can be promoted at a high level.

[0025] Colorant

[0026] The colorant contained in the hydrogen sulfide detection agent according to this embodiment will be described. The colorant is an element or compound that develops color upon contact with hydrogen sulfide. Examples of colorants include chalcophile elements, siderophile elements, or compounds thereof.

[0027] For example, examples of chalcophiles could be copper, zinc, gallium, germanium, arsenic, selenium, silver, cadmium, lanthanum, tin, antimony, tellurium, mercury, thallium, lead, bismuth, or polonium. Examples of siderophiles could be manganese, iron, cobalt, nickel, molybdenum, ruthenium, rhodium, palladium, rhenium, osmium, iridium, platinum, and gold.

[0028] Among the materials mentioned above, the colorant is preferably selected from at least one of the group consisting of silver, silver compounds, copper, copper compounds, nickel, nickel compounds, cobalt, cobalt compounds, lead, lead compounds, iron, and iron compounds. More preferably, the colorant is composed of at least one of the group consisting of silver, silver compounds, lead, lead compounds, iron, and iron compounds. The inventors have discovered that hydrogen sulfide detection reagents using the above-mentioned colorants readily develop color even at low colorant concentrations.

[0029] It should be noted that the colorant is preferably in powder form. However, the colorant can also be in any form.

[0030] The colorant content of the hydrogen sulfide detection agent is freely selectable; for example, based on 100 parts by weight of polymer material, the colorant content is 10 parts by weight or more and 500 parts by weight or less. If the content of the color-developing accelerator in the polymer material is too high, it will be difficult to knead during the manufacturing process. On the other hand, if the content of the color-developing accelerator in the polymer material is too low, the colorant will be difficult to develop color. According to the configuration in which the colorant content is 10 parts by weight or more and 500 parts by weight or less, both kneading and color development of the colorant during the production process can be promoted at a high level.

[0031] polymer materials

[0032] The polymer material contained in the hydrogen sulfide detection agent according to this embodiment will be described.

[0033] There are no particular restrictions on the type of polymer material; any known polymer material can be used. For example, examples of polymer materials that can be used as hydrogen sulfide detectors include rubber materials, such as diene-based rubbers, their hydrogenated products, olefin-based rubbers, halogen-containing rubbers, silicone rubbers, sulfur-containing rubbers, and fluororubbers.

[0034] Examples of diene-based rubbers and their hydrogenated products include natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene-butadiene rubber (SBR), butadiene rubber (BR) (high cis BR and low cis BR), acrylonitrile-butadiene rubber (NBR), hydrogenated NBR, hydrogenated SBR, etc.

[0035] Examples of olefin-based rubbers include ethylene propylene rubber (EPM), ethylene propylene diene rubber (EPDM), maleic acid modified ethylene propylene rubber (M-EPM), maleic anhydride modified ethylene-α-olefin copolymer, ethylene-glycidyl methacrylate copolymer, maleic anhydride modified ethylene-ethyl acrylate copolymer (modified EEA), butyl rubber (IIR), copolymers of isobutylene with aromatic vinyl or diene-based monomers, acrylic rubber (ACM), or ionomers.

[0036] Examples of halogen-containing rubbers include halogenated butyl rubbers such as brominated butyl rubber (Br-IIR) and chlorinated butyl rubber (Cl-IIR), halogenated isobutylene-p-alkylstyrene copolymers (e.g., brominated isobutylene-p-methylstyrene copolymer (BIMS)), halogenated isobutylene-isoprene copolymer rubbers, chloroprene rubber (CR), epichlorohydrin rubber (CHR), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), or maleic acid modified chlorinated polyethylene (M-CM), etc.

[0037] Examples of silicone rubber include methyl vinyl silicone rubber (VMQ), dimethyl silicone rubber, or methyl phenyl vinyl silicone rubber. Examples of sulfur-containing rubber include polysulfide rubber. Examples of fluororubber include rubbers based on vinylidene fluoride, rubbers based on fluorinated vinyl ethers, rubbers based on tetrafluoroethylene-propylene, rubbers based on fluorinated organosilicones, or rubbers based on fluorinated phosphazenes.

[0038] It should be noted that the polymer material may preferably be selected from at least one of the group consisting of ethylene propylene diene monomer (EPDM), silicone rubber, acrylic rubber and fluororubber.

[0039] The hydrogen sulfide detection agent according to this embodiment comprises the polymer material, colorant, and color development promoter given above, and may also contain other components. However, the content of said other components is preferably 30% by mass or less, more preferably 15% by mass or less, even more preferably 5% by mass or less, and even more preferably 1% by mass or less.

[0040] Example

[0041] Experiment A

[0042] Colorimetric experiments (hereinafter referred to as "Experiment A") were conducted on multiple samples (Examples A1, A2, Comparative Examples A1, A2) prepared by the following combinations of materials. Specifically, the mixed materials were thoroughly kneaded and then solidified into a disc to obtain the sample.

[0043] Example A1

[0044] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0045] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0046] • Colorant: 130 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0047] • Color development accelerator: 1 part by weight of silicone oil (TA-5 manufactured by Shin-Etsu Chemical Co., Ltd.)

[0048] Comparative Example A1

[0049] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0050] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0051] • Colorant: 130 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0052] In other words, Comparative Example A1 is a sample in which the materials other than the color development accelerator (silicone oil) are the same as those in Example A1, that is, a sample that does not contain the color development accelerator of Example A1.

[0053] Example A2

[0054] • Polymer material: 100 parts by weight of silicone rubber (QP1-25 BASE JPN manufactured by SIR Corporation)

[0055] • Crosslinking agent: 2 parts by weight of peroxide crosslinking agent (TC-8 manufactured by Momentive Performance Materials Japan LLC)

[0056] • Colorant: 130 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0057] • Color development accelerator: 1 part by weight of silicone oil (TA-5 manufactured by Shin-Etsu Chemical Co., Ltd.)

[0058] Comparative Example A2

[0059] • Polymer material: 100 parts by weight of silicone rubber (QP1-25 BASE JPN manufactured by SIR Corporation)

[0060] • Crosslinking agent: 2 parts by weight of peroxide crosslinking agent (TC-8 manufactured by Momentive Performance Materials Japan LLC)

[0061] • Colorant: 130 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0062] In other words, Comparative Example A2 is a sample in which the materials other than the color development accelerator (silicone oil) are the same as those in Example A2, that is, a sample that does not contain the color development accelerator of Example A2.

[0063] Experimental methods

[0064] Using a testing machine (model: GH-180, manufactured by Yamazaki Seiki Laboratory Co., Ltd.), each sample was exposed to hydrogen sulfide gas under the following test conditions, and the degree of color change was observed.

[0065] Test conditions

[0066] • Gas type: Hydrogen sulfide

[0067] • Concentration: 5 ppm

[0068] Temperature: 25 degrees Celsius

[0069] Humidity: 75%

[0070] • Test duration: 24 hours

[0071] Results of Experiment A

[0072] Figure 1 Photographs of each sample before and after contact with hydrogen sulfide gas are shown. Figure 1 As shown, the color change in Examples A1 and A2, which contain silicone oil, is greater than that in Comparative Examples A1 and A2, which do not contain silicone oil. In other words, it is considered that the color development degree of Examples A1 and A2, corresponding to the hydrogen sulfide detection agent containing silicone oil according to this embodiment, is improved compared to Comparative Examples A1 and A2, which do not contain silicone oil.

[0073] Experiment B

[0074] right Figure 2 Multiple samples shown in the figure (Examples B1 to B8, Comparative Examples B1 to B2) were subjected to a color development experiment (hereinafter referred to as "Experiment B"). As in Experiment A, the mixed materials were thoroughly kneaded and then solidified into a disc to obtain the sample.

[0075] Example B1

[0076] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0077] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0078] • Colorant: 136 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0079] • Color development accelerator: 1 part by weight of silicone oil (TA-5 manufactured by Shin-Etsu Chemical Co., Ltd.)

[0080] Example B2

[0081] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0082] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0083] • Colorant: 64 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0084] • Color development accelerator: 1 part by weight of silicone oil (TA-5 manufactured by Shin-Etsu Chemical Co., Ltd.)

[0085] In other words, Example B2 is a sample with a reduced colorant content compared to Example B1.

[0086] Example B3

[0087] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0088] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0089] • Colorant: 136 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0090] • Color development accelerator: 2 parts by weight of silicone oil (TA-5 manufactured by Shin-Etsu Chemical Co., Ltd.)

[0091] In other words, Example B3 is a sample with an increased content of color development promoter compared to Example B1.

[0092] Example B4

[0093] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0094] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0095] • Colorant: 136 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0096] • Color development accelerator: 1 part by weight of processing oil (PW-380 manufactured by Idemitsu Kosan Co., Ltd.)

[0097] In other words, Example B4 is a sample obtained by changing the type of color development promoter relative to Example B1.

[0098] Example B5

[0099] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0100] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0101] • Colorant: 136 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0102] • Color development accelerator: 2 parts by weight of processing oil (PW-380 manufactured by Idemitsu Kosan Co., Ltd.)

[0103] In other words, Example B5 is a sample with an increased content of color development promoter compared to Example B4.

[0104] Example B6

[0105] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0106] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0107] • Colorant: 136 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0108] • Color development accelerator: 1 part by weight of ester oil (TS-735 manufactured by ADEKA).

[0109] In other words, Example B6 is a sample obtained by changing the type of color-developing promoter relative to Example B1. It should be noted that the molecular weight of the ester oil in Example B6 is approximately 850.

[0110] Example B7

[0111] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0112] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0113] • Colorant: 136 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0114] • Color development accelerator: 2 parts by weight of ester oil (TS-735 manufactured by ADEKA).

[0115] In other words, Example B7 is a sample with an increased content of color development promoter compared to Example B4.

[0116] Example B8

[0117] • Polymer material: 100 parts by weight of silicone rubber (QP1-25 BASE JPN manufactured by SIR Corporation)

[0118] • Crosslinking agent: 2 parts by weight of peroxide crosslinking agent (TC-8 manufactured by Momentive Performance Materials Japan LLC)

[0119] • Colorant: 122 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0120] • Color development accelerator: 1 part by weight of silicone oil (TA-5 manufactured by Shin-Etsu Chemical Co., Ltd.)

[0121] In other words, Example B8 is a sample obtained by changing the type of polymer material and crosslinking agent and the content of colorant relative to Example B1.

[0122] Comparative Example B1

[0123] • Polymer material: 100 parts by weight of EPDM polymer (EPT4045 manufactured by Mitsui Chemicals, Inc.)

[0124] • Crosslinking agent: 3 parts by weight of peroxide crosslinking agent (PERCUMYL D manufactured by NOF Corporation)

[0125] • Colorant: 136 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWA ELECTRONICS MATERIALS CO.,LTD.)

[0126] In other words, Comparative Example B1 is a sample obtained by excluding the color development promoter from Example B1.

[0127] Comparative Example B2

[0128] • Polymer material: 100 parts by weight of silicone rubber (QP1-25 BASE JPN manufactured by SIR Corporation)

[0129] • Crosslinking agent: 2 parts by weight of peroxide crosslinking agent (TC-8 manufactured by Momentive Performance Materials Japan LLC)

[0130] • Colorant: 122 parts by weight of silver powder (silver powder FA-2-3 manufactured by DOWAELECTRONICS MATERIALS CO.,LTD.)

[0131] In other words, Comparative Example B1 is a sample obtained by excluding the color development promoter from Example B1.

[0132] Each sample was exposed to hydrogen sulfide gas in a manner and under conditions similar to those in Experiment A. Figure 2 The color difference ΔE*ab of each sample before and after contact with hydrogen sulfide gas is shown. A colorimeter (CR-400) manufactured by Konica Minolta Japan Co., Ltd. was used to measure the color difference ΔE*ab.

[0133] The color difference ΔE*ab is the distance between the chromaticity coordinates (L1*, a1*, b1*) of the sample before contact with hydrogen sulfide gas and the chromaticity coordinates (L2*, a2*, b2*) after contact with hydrogen sulfide gas. Each chromaticity coordinate (Ln*, an*, bn*) (n = 1, 2) is a coordinate in the L*a*b* color space.

[0134] Specifically, the color difference ΔE*ab is represented by the following equation.

[0135] ΔE*ab={(L2*-L1*) 2 +(a2*-a1*) 2 +(a2*-a1*) 2} 1 / 2

[0136] In other words, it can be determined that the larger the color difference ΔE*ab, the greater the color change of the sample before and after contact with hydrogen sulfide gas.

[0137] Results of Experiment B

[0138] like Figure 2 As shown, the color difference ΔE*ab of Examples B1 and B3 to B7, which contain a color development accelerator, is numerically greater than the color difference ΔE*ab of Comparative Example B1, which does not contain a color development accelerator. Similarly, the color difference ΔE*ab of Example B8 is numerically greater than the color difference ΔE*ab of Comparative Example B2. Based on the above results, it is confirmed that the degree of color development is improved by adding a color development accelerator.

[0139] The color difference ΔE*ab of Example B2 is numerically the same as that of Comparative Example B1. However, the colorant content of Example B2 is half that of Comparative Example B1. Based on the above results, it is confirmed that when the colorant is reduced (e.g., halved), the same color development can be maintained by adding a color development promoter.

[0140] The color difference ΔE*ab of Examples B1 to B5 is greater than or equal to the color difference E*ab of Comparative Example B1. Based on the above results, it is confirmed that adding silicone oil or processing oil as a color development promoter improves the degree of color development. Furthermore, the color difference ΔE*ab of Examples B6 and B7, which contain ester oil (i.e., polar oil) as a color development promoter, is numerically greater than the color difference ΔE*ab of Examples B1 to B5. Based on the above results, it is confirmed that using polar oil as a color development promoter more effectively improves the degree of color development.

[0141] The color difference ΔE*ab in Example B7 is numerically greater than that in Example B6, where the content of the color-developing accelerator is less than that in Example B7. Based on the above results, it is confirmed that increasing the content of the color-developing accelerator (especially polar oil) more effectively improves the degree of color development.

[0142] The color difference ΔE*ab in Example B8 is numerically greater than the color difference E*ab in Comparative Example B2. Therefore, it is confirmed that when a polymer material (silicone rubber) of a different type than that used in Examples B1 to B7 is used as a substrate, the degree of color development is also improved by adding a color development accelerator.

[0143] Supplementary Explanation

[0144] For example, the following configuration can be obtained from the foregoing embodiments.

[0145] According to one aspect of this disclosure (first aspect), a hydrogen sulfide detection agent comprises: a polymer material as a base, a colorant configured to develop color upon contact with hydrogen sulfide, and a color development promoter configured to promote the color development of the colorant. According to this aspect, hydrogen sulfide can be detected with high precision. For example, low concentrations of hydrogen sulfide can be detected and the colorant content can be controlled.

[0146] In a specific example of the first aspect (the second aspect), the colorant is composed of at least one selected from the group consisting of silver, silver compounds, copper, copper compounds, nickel, nickel compounds, cobalt, cobalt compounds, lead, lead compounds, iron, and iron compounds.

[0147] In a specific example of the first or second aspect (the third aspect), the color-developing promoter is an oil. In a specific example (the fourth aspect), the color-developing promoter is an oil with a molecular weight of 5000 or less. In a more preferred example (the fifth aspect), the color-developing promoter is a polar oil. According to the third to the fifth aspects, color development caused by the colorant can be effectively promoted.

[0148] As a specific example of any of the first to fifth aspects, examples are given such that the color development accelerator comprises silicone oil (sixth aspect), an ester oil (seventh aspect), or a processing oil (eighth aspect). It should be noted that the color development accelerator may consist of a mixture of various types of materials (e.g., oils).

[0149] In a specific example of any of aspects one through eight (nine aspect), based on 100 parts by mass of polymer material, the content of colorant is 10 parts by mass or more and 500 parts by mass or less. Furthermore, in a specific example of any of aspects one through nine (tenth aspect), based on 100 parts by mass of polymer material, the content of color-developing accelerator is 0.1 parts by mass or more and 30 parts by mass or less. According to the above aspects, both kneading and color development of the colorant during the production process can be promoted at a high level.

[0150] It should be noted that in any of the first to eighth aspects, a configuration in which the content of colorant is 10 parts by mass or more, or a configuration in which the content of color-developing accelerator is 0.1 parts by mass or more, is envisioned. According to this aspect, the ease of color development of the colorant can be maintained compared to configurations in which the content of colorant or color-developing accelerator is less. Furthermore, in any of the first to eighth aspects, a configuration in which the content of colorant is 500 parts by mass or less, or a configuration in which the content of color-developing accelerator is 30 parts by mass or less, is envisioned. According to this aspect, compared to configurations in which the content of colorant or color-developing accelerator is greater, the material kneading during the production process can be facilitated.

Claims

1. A hydrogen sulfide detection reagent, comprising: Polymer materials as a base; A colorant configured to develop color upon contact with hydrogen sulfide; and A color-developing promoter configured to enhance the color development of the colorant.

2. The hydrogen sulfide detection reagent according to claim 1, wherein, The colorant is composed of at least one selected from the group consisting of silver, silver compounds, copper, copper compounds, nickel, nickel compounds, cobalt, cobalt compounds, lead, lead compounds, iron, and iron compounds.

3. The hydrogen sulfide detection reagent according to claim 1 or 2, wherein, The color development accelerator is an oil.

4. The hydrogen sulfide detection reagent according to claim 3, wherein, The color development promoter is an oil with a molecular weight of 5000 or less.

5. The hydrogen sulfide detection reagent according to claim 3 or 4, wherein, The color development accelerator is a polar oil.

6. The hydrogen sulfide detection reagent according to claim 3, wherein, The color development accelerator includes silicone oil.

7. The hydrogen sulfide detection reagent according to claim 3, wherein, The color development accelerator includes ester oil.

8. The hydrogen sulfide detection reagent according to claim 3, wherein, The color development accelerator includes processing oil.

9. The hydrogen sulfide detection reagent according to claim 1, wherein, Based on 100 parts by weight of the polymer material, the colorant content is 10 parts by weight or more and 500 parts by weight or less.

10. The hydrogen sulfide detection reagent according to claim 9, wherein, Based on 100 parts by weight of the polymer material, the content of the color-developing accelerator is 0.1 parts by weight or more and 30 parts by weight or less.

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