Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
  • G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators

Definitions

• the present disclosure relates to an environmental factor detector for the purpose of detecting environmental factors existing in the environment.
• an environmental factor detector has been devised as a prior art.
• the devised detector has a fixed shape such as a plate or a piece of paper (Patent Documents 1 to 4). Therefore, when setting up the environment to be surveyed, it was necessary to attach it to a pedestal and hang it, or attach it to a flat part.
• Patent Document 1 Japanese Unexamined Patent Publication No. 52-85882
• a test piece impregnated with a lead acetate solution that changes color due to a reaction with hydrogen sulfide gas is placed at a measurement point, and a diffusion range is determined based on the hue change.
• Methods for measuring velocity and concentration are disclosed.
• Patent Document 2 Japanese Patent Publication No. 62-184460 discloses a humidity indicator in which a moisture-permeable resin contains porous silica carrying a substance that changes color depending on humidity.
• Patent Document 3 Japanese Unexamined Patent Publication No. 2003-1213666 discloses a color reaction agent that reacts with a gas and a gas detection material in which glycerin or 1,3 propanediol is supported on a carrier as a moisturizer. ..
• Patent Document 4 Japanese Unexamined Patent Publication No. 2005-227268 discloses a material for detecting hydrogen sulfide gas containing a non-photosensitive organic silver salt and a method for detecting hydrogen sulfide gas by thermal development.
• the present disclosure has been made in view of the current situation, and an object of the present disclosure is to provide an environmental factor detector that can be easily installed in the surveyed environment.
• the reagent consists of a reagent that reacts with environmental factors to develop color and a transparent or translucent substrate that does not discolor the reagent.
• the reagent is dispersed in the substrate and An environmental factor detector whose base material is a non-curable material or a curable material.
• an environmental factor detector that can be easily installed in the environment to be investigated because an appropriate amount is taken out and adhered to the object at the time of use.
• Embodiment 1 relates to an environmental factor detector.
• the environmental factor detector of the present disclosure comprises a reagent that reacts and develops color only by contacting with an environmental factor, and a transparent or translucent substrate that does not discolor the reagent, and the reagent is dispersed in the substrate.
• the substrate is made of a non-curable material or a curable material.
• the environmental factor detecting agent is used for detecting environmental factors by directly applying and adhering to an object in the survey environment.
• the environmental factor means, for example, a factor that constitutes the physical environment or social environment in which people live or the environment due to the social attitude of people.
• the environmental factors include climate factors such as temperature and humidity, and chemical factors (gas factors) such as ozone and carbon dioxide.
• the gas factor includes sulfur-containing gas
• the sulfur-containing gas includes hydrogen sulfide gas.
• the detection agent contains a reagent that reacts with the sulfur-containing gas to develop a color, and is a place where the sulfur-containing gas is diffused.
• an inorganic salt such as a copper salt in the environmental factor detecting agent reacts with hydrogen sulfide-containing hydrogen gas to produce a colored inorganic compound such as copper sulfide. Since the substrate in the detection agent is transparent or translucent without discoloring the reagent, it can be determined that the base material is due to the compound in which the color change is generated.
• the reagent refers to a reagent that reacts only with an environmental factor to develop a color
• the reagent is, for example, a reagent that reacts only with a sulfur-containing gas to produce a compound in which the discolored color does not fade. ..
• a copper compound that produces copper sulfide is preferable.
• copper nitrate and copper sulfate are preferable.
• the reagent preferably contains a moisturizer because water is required when the copper compound reacts with the sulfur-containing gas to form copper sulfide.
• a moisturizer silica gel and ⁇ -alumina are preferable, and they may be used in combination or mixed alone. Further, when copper nitrate is used as the copper compound, ⁇ -alumina is more preferable, and when copper sulfate is used as the copper compound, silica gel is more preferable.
• the copper compound and the moisturizer are homogeneously mixed in the reagent.
• homogeneous means a state in which the powdered copper compound and the powdered moisturizer are ground and mixed, and no part is uneven.
• such a reagent can be obtained by mixing the copper compound and the moisturizer at a weight ratio of 1: 1 and grinding them in a mortar so as to be homogeneous.
• the substrate is transparent or translucent, does not discolor when mixed with the reagent, and is made of a non-curable material or a curable material.
• the substrate preferably has gas permeability and moisture permeability.
• the non-curable material include a non-curable polymer material
• examples of the curable material include a moisture-curable polymer material.
• the non-curable polymer material is a polymer material that is maintained as a paste, gel, etc. without being cured. Therefore, it can be easily attached without being influenced by the shape of the survey environment and can be easily wiped off after use.
• Examples of the non-curable polymer material include silicone oil compounds.
• the miscibility of the silicone oil compound in the present disclosure is preferably 180 to 230, more preferably 200 to 220.
• the miscibility can be measured by JIS K2220.
• Moisture-curable polymer material is a polymer material that cures by chemically reacting with moisture in the air. Therefore, it can be easily attached without being affected by the shape of the survey environment or the like. Although it cannot be easily wiped off as compared with the non-curable polymer material, it can be used without any problem even if it is touched for some reason after application.
• Examples of the moisture-curable polymer material include moisture-curable silicone rubber.
• the miscibility of the moisture-curable silicone rubber in the present disclosure before curing is preferably 180 to 230, more preferably 200 to 220.
• the environmental factor detector of the present disclosure comprises a reagent and a substrate having the above-mentioned characteristics, and is stored in a sealed state in an uncured state. During the sealed storage, the viscosity and fluidity are maintained in a state where the reagent is dispersed in the substrate.
• the method of sealed storage is not particularly limited, and examples thereof include storage in a laminated tube with a screw cap.
• the weight of the copper compound contained in the reagent must be 10% by mass or less with respect to the total amount of the environmental factor detector.
• Example 1 5 g of granular copper nitrate trihydrate and 5 g of ⁇ -alumina having a particle size of 1 ⁇ m are placed in a mortar and mixed while grinding to obtain a reagent. The reagent was kneaded into 40 g of a translucent silicone oil compound as a base material to obtain an environmental factor detector. A silicone oil compound having a miscibility of about 210 was used.
• Example 2 5 g of granular copper sulfate pentahydrate and 5 g of ⁇ -alumina having a particle size of 1 ⁇ m are placed in a mortar and mixed while grinding to obtain a reagent. Other than that, the environmental factor detector of Example 2 was obtained in the same manner as in Example 1.
• Table 1 shows the discolored state when Examples 1 and 2 and Reference Examples 1 and 2 were exposed to 1 ppm hydrogen sulfide gas environment for 24 hours.
• Example 1 it was found that when exposed to a 1 ppm hydrogen sulfide gas environment for 24 hours, a light gray color was added. Further, in the case of Example 2, although there was no significant change as compared with Example 1, the result was that the color of the detection agent became lighter. In the case of Reference Examples 1 and 2, it is considered that the color is unlikely to change.
• Example 3 In the same manner as in Example 1, 5 g of granular copper nitrate trihydrate and 5 g of ⁇ -alumina having a particle size of 1 ⁇ m are placed in a mortar and mixed while grinding to obtain a reagent. The reagent was kneaded into a translucent moisture-curable silicone rubber as a base material to obtain an environmental factor detector. A moisture-curable silicone rubber having a miscibility of about 220 was used.
• Example 4 5 g of granular copper sulfate pentahydrate and 5 g of ⁇ -alumina having a particle size of 1 ⁇ m are placed in a mortar and mixed while grinding to obtain a reagent. Other than that, the environmental factor detector of Example 4 was obtained in the same manner as in Example 3.
• Table 2 shows the discolored state when Examples 3 and 4 and Reference Examples 3 and 4 were exposed to 1 ppm hydrogen sulfide gas environment for 24 hours.
• Example 3 was found to turn greenish ocher when exposed to a 1 ppm hydrogen sulfide gas environment for 24 hours. Further, in the case of Example 4, although there was no significant change as compared with Example 3, the result was that the color of the detection agent became lighter. In the case of Reference Examples 3 and 4, it is considered that the color is unlikely to change.
• Example 3 When the environmental factor detector of Example 3 was exposed to room temperature and atmospheric pressure, it started to cure in about 10 minutes, completely cured in about 20 hours, and adhered to the coated surface.
• Example 5 5 g of granular copper nitrate trihydrate and 5 g of granular silica gel are placed in a mortar and mixed while grinding to make a reagent. The reagent was kneaded into 40 g of a translucent moisture-curable silicone rubber as a base material to obtain an environmental factor detector. A moisture-curable silicone rubber having a miscibility of about 220 was used.
• Example 6 5 g of granular copper sulfate pentahydrate and 5 g of granular silica gel are placed in a mortar and mixed while grinding to make a reagent. Other than that, the environmental factor detector of Example 6 was obtained in the same manner as in Example 5.
• Table 3 shows the discolored state when Examples 5 and 6 were exposed to the environment of 1 ppm hydrogen sulfide gas for 24 hours.
• Example 5 was found to turn pale green when exposed to a 1 ppm hydrogen sulfide gas environment for 24 hours. Further, in the case of Example 6, it was found that the color changed to greenish light blue.
• Example 3 did not discolor even when exposed to a 0.1 ppm hydrogen sulfide gas environment for 24 hours, but turned green when exposed to 240 hours. Further, in the case of Example 6, it was found that the color did not change even after being exposed for 24 hours, but the color changed to greenish brown when exposed for 240 hours.
• Examples 3 and 6 were exposed to the exhaust duct outlet connected to the miscellaneous drainage ditch of the accommodation facility under a dilute hydrogen sulfide gas environment of 0.005 to 0.01 ppm for one month.
• the environmental factor detectors of each example were stored and carried in a laminated tube with a screw cap to the above-mentioned accommodation facility.
• the environmental factor detector of each example was applied directly to the inside of the exhaust duct outlet from which dirt had been wiped off in advance. Table 5 shows the discolored state after one month has passed.
• Example 3 turned pale green when exposed to a dilute hydrogen sulfide gas environment of 0.005 to 0.01 ppm for 1 month. Further, in the case of Example 6, it was found that the color changed to greenish light blue. Further, the environmental factor detectors of Examples 3 and 6 started to cure in about 10 minutes, completely cured in about 20 hours, and adhered to the coated surface.

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Citations (12)

• 2021
  • 2021-04-23 JP JP2021570186A patent/JPWO2021256087A1/ja active Pending
  • 2021-04-23 WO PCT/JP2021/016440 patent/WO2021256087A1/ja not_active Ceased

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