JPH0658902A - Hygrometer - Google Patents
HygrometerInfo
- Publication number
- JPH0658902A JPH0658902A JP21405392A JP21405392A JPH0658902A JP H0658902 A JPH0658902 A JP H0658902A JP 21405392 A JP21405392 A JP 21405392A JP 21405392 A JP21405392 A JP 21405392A JP H0658902 A JPH0658902 A JP H0658902A
- Authority
- JP
- Japan
- Prior art keywords
- water
- dissolved
- dried
- alcohol
- added
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 24
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 8
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract 3
- 238000001035 drying Methods 0.000 claims abstract 2
- 239000002244 precipitate Substances 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 3
- RXCMFQDTWCCLBL-UHFFFAOYSA-N 4-amino-3-hydroxynaphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(N)=C(O)C=C(S(O)(=O)=O)C2=C1 RXCMFQDTWCCLBL-UHFFFAOYSA-N 0.000 claims description 2
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 claims description 2
- 229940010552 ammonium molybdate Drugs 0.000 claims description 2
- 235000018660 ammonium molybdate Nutrition 0.000 claims description 2
- 239000011609 ammonium molybdate Substances 0.000 claims description 2
- 239000004570 mortar (masonry) Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- OLLFKUHHDPMQFR-UHFFFAOYSA-N dihydroxy(diphenyl)silane Chemical compound C=1C=CC=CC=1[Si](O)(O)C1=CC=CC=C1 OLLFKUHHDPMQFR-UHFFFAOYSA-N 0.000 claims 1
- 239000010419 fine particle Substances 0.000 claims 1
- 239000012265 solid product Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 5
- 239000005078 molybdenum compound Substances 0.000 abstract description 4
- 150000002752 molybdenum compounds Chemical class 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract description 2
- 239000007864 aqueous solution Substances 0.000 abstract description 2
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 2
- 239000011733 molybdenum Substances 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 abstract 1
- 239000000470 constituent Substances 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 239000011550 stock solution Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は湿度の検知や湿度測定の
ための感湿物質および湿度センサに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a humidity-sensitive substance and a humidity sensor for detecting humidity and measuring humidity.
【０００２】[0002]
【従来の技術】従来、湿度センサの検湿方法としては、
高分子膜やセラミック膜の電気抵抗変化を用いる方法や
高分子薄膜の静電容量変化を用いる方法などがあり、そ
れぞれ一長一短がある。 モリブデン系化合物に湿潤剤
として塩化ランタンを加えた感湿物質を用いた湿度セン
サも既に特許になっているが、この感湿物質は水溶性成
分を含む。2. Description of the Related Art Conventionally, as a humidity detecting method for a humidity sensor,
There are a method of using electric resistance change of a polymer film and a ceramic film, a method of using electrostatic capacity change of a polymer thin film, and the like, each of which has advantages and disadvantages. A humidity sensor using a moisture sensitive substance obtained by adding lanthanum chloride as a wetting agent to a molybdenum compound has already been patented, but this moisture sensitive substance contains a water-soluble component.
【０００３】[0003]
【発明が解決しようとする課題】上記モリブテン系化合
物を用いるセンサは、水溶性成分により、結露またはそ
れに近い条件で測定すると、センサの表面の状態が変化
し、このためセンサの特性が変わる傾向があった。また
水溶性成分は化学活性が強いため、普通の条件で測定を
続けても、長期間にはセンサの特性が変わる恐れがあっ
た。In the sensor using the above molybdenum compound, the surface condition of the sensor changes due to the water-soluble component, and the condition of the surface of the sensor changes, so that the characteristics of the sensor tend to change. there were. Further, since the water-soluble component has a strong chemical activity, the characteristics of the sensor may change for a long period of time even if the measurement is continued under normal conditions.
【０００４】[0004]
【問題を解決するための手段】上記モリブテン系化合物
（詳しくは後述）は水溶性であり、塩化ランタンも水溶
性であるが、水溶液として両者を混合すると、多量の沈
澱を生じ、この沈澱を分離して、十分水洗後乾燥した物
は感湿性があり、湿度とともに電気抵抗が変化する。従
って、これを用いて湿度センサ作れば、感湿物質が水に
不溶であるため、上記の課題を一挙に解決する。[Means for Solving the Problem] The above molybdenum compound (detailed later) is water-soluble, and lanthanum chloride is also water-soluble, but when both are mixed as an aqueous solution, a large amount of precipitate is formed, and this precipitate is separated. Then, the product which has been thoroughly washed with water and dried has moisture sensitivity, and its electric resistance changes with humidity. Therefore, if a humidity sensor is made using this, the above-mentioned problems can be solved all at once because the moisture-sensitive substance is insoluble in water.
【０００５】[0005]
【実施例】次に、本発明実施の一例に付いて説明する。Next, an example of the present invention will be described.
【０００６】モリブデン酸アンモニウム１００部（重量
比以下同じ）、シュウ酸７０部を亜硫酸水（８％）４０
０部に溶解し、これに１アミノ２ナフトール４スルホン
酸６部を加え、蓋をした耐酸容器に入れて温浴により加
熱する。還元反応終了後ろ過し、ろ液を温浴により更に
加熱して蒸発乾固する。この乾固物にメチルアルコール
２９０部にシュウ酸４２部を溶かしたものを加え、溶解
する成分を完全に溶解し、生成する淡褐色の溶液と燈色
の不溶解残査のうち後者をろ過により除去する。（以下
ここに生成したメチルアルコール溶液を原液という。原
液の製法は公知である）。100 parts of ammonium molybdate (same weight ratio below), 70 parts of oxalic acid and 40 parts of sulfite water (8%)
It is dissolved in 0 part, 6 parts of 1 amino 2 naphthol 4 sulfonic acid is added thereto, placed in an acid resistant container with a lid and heated by a warm bath. After completion of the reduction reaction, the mixture is filtered and the filtrate is further heated with a warm bath and evaporated to dryness. To this dry solid was added 290 parts of methyl alcohol dissolved with 42 parts of oxalic acid to completely dissolve the soluble components, and the resulting light brown solution and the latter of the insoluble residue of amber color were filtered. Remove. (Hereinafter, the methyl alcohol solution produced here is referred to as a stock solution. A method for producing the stock solution is known).
【０００７】原液２０ｍｌをビーカーにとり、温浴によ
り加熱してアルコール分を蒸発し、更に１０５度−１１
０度の温度でしばらく加熱して、先に加えたシュウ酸の
大部分は蒸発除去する。次に水約２０ｍを加えて溶解
し、不溶物をろ過により除く。20 ml of the stock solution was placed in a beaker and heated in a warm bath to evaporate the alcohol content.
After heating for a while at a temperature of 0 degree, most of the previously added oxalic acid is removed by evaporation. Next, about 20 m of water is added and dissolved, and the insoluble matter is removed by filtration.
【０００８】上記のろ液に塩化ランタン水溶液を滴下
し、沈澱を完了させた後ろ過する。濾紙上の沈澱を充分
水洗いし、濾紙と共に乾燥後メチルアルコールに解いて
再びろ過し、残差を乾燥して、水及びアルコールに不溶
な感湿物質を得る。An aqueous lanthanum chloride solution is added dropwise to the above filtrate to complete the precipitation and then filtered. The precipitate on the filter paper is thoroughly washed with water, dried together with the filter paper, thawed in methyl alcohol and filtered again, and the residue is dried to obtain a moisture-sensitive substance insoluble in water and alcohol.
【０００９】上記粉末を乳鉢にとり、アルコールに溶か
したジシドロキシジフェニルシラン小量を加えて、すり
つぶしながら混合し、適当な調度に成ったとき、一部を
アルミナ基盤櫛形電極付きなどのセンサ基盤上に薄く塗
布して乾燥し、湿度センサを得る。一例として巾５ｍｍ
長さ７ｍｍの基盤のセンサの電気抵抗と相対湿度との関
係を図１に示す。[0009] The above powder was placed in a mortar, a small amount of disidroxydiphenylsilane dissolved in alcohol was added, and the mixture was ground and mixed. Then, apply it thinly on and dry it to obtain a humidity sensor. 5mm width as an example
FIG. 1 shows the relationship between the electrical resistance and the relative humidity of a 7 mm long base sensor.
【００１０】[0010]
【発明の効果】以上に説明したように、モリブデン系化
合物と塩化ランタンから、水に不溶な感湿性の物質を作
り、これを用いたセンサを作ることにより、先に特許に
成っているモリブデン系化合物を用いたセンサが、高湿
度下や長期の使用後にその特性の変わる傾向や、結露な
どによる悪影響を防止する。Industrial Applicability As described above, a molybdenum-based compound and lanthanum chloride are used to prepare a moisture-insensitive substance that is insoluble in water, and a sensor using the same is prepared. The sensor using the compound prevents the tendency of its characteristics to change under high humidity or after long-term use and the adverse effect of dew condensation.
【図１】本発明によるセンサの電気抵抗の対数と相対湿
度との関係の一例。 １ 関係図の横軸 相対湿度％ ２ 関係図の縦軸 電気抵抗（キロオーム）の対数 ３ 測定点FIG. 1 shows an example of the relationship between the logarithm of the electric resistance of a sensor according to the present invention and the relative humidity. 1 Horizontal axis of the relationship diagram Relative humidity% 2 Vertical axis of the relationship diagram Logarithm of electrical resistance (kiloohm) 3 Measurement points
Claims (2)
ムを亜硫酸水に溶解し、１アミノ２ナフトール４スルホ
ン酸を加え、加熱還元後乾固して生成する固形物に、シ
ュウ酸を含むメチルアルコールを加え、溶解する成分の
みを抽出し、抽出液を蒸発乾固し、冷後水を加えてろ過
し、ろ液に塩化ランタンを加えて沈澱を生成させてろ過
し、残査を水洗後乾燥しアルコールに溶かして再びろ過
し、残査を乾燥して得られる水及びアルコールにに不溶
な感湿物質。1. Oxalic acid and ammonium molybdate are dissolved in sulfite water, 1 amino 2 naphthol 4 sulfonic acid is added, and a solid product produced by heating and reducing to dryness is added with oxalic acid-containing methyl alcohol, Extract only the soluble components, evaporate the extract to dryness, add water after cooling, filter, add lanthanum chloride to the filtrate to form a precipitate, and filter.The residue is washed with water and dried to alcohol. A moisture-sensitive substance that is insoluble in water and alcohol, which is obtained by dissolving, filtering again, and drying the residue.
と共に小量のジヒドロキシジフェニルシランを加え、乳
鉢などですりつぶしながら混合し、これを電極を持つセ
ンサ基盤に塗布して成る湿度センサ。2. A humidity sensor formed by adding a small amount of dihydroxydiphenylsilane to fine particles of the above moisture-sensitive substance together with methyl alcohol, mixing while grinding in a mortar or the like, and applying this to a sensor base having electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21405392A JPH0658902A (en) | 1992-08-11 | 1992-08-11 | Hygrometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21405392A JPH0658902A (en) | 1992-08-11 | 1992-08-11 | Hygrometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0658902A true JPH0658902A (en) | 1994-03-04 |
Family
ID=16649485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21405392A Pending JPH0658902A (en) | 1992-08-11 | 1992-08-11 | Hygrometer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0658902A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6911005B2 (en) | 2001-10-25 | 2005-06-28 | Pentax Corporation | Endoscope with detachable sheath |
-
1992
- 1992-08-11 JP JP21405392A patent/JPH0658902A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6911005B2 (en) | 2001-10-25 | 2005-06-28 | Pentax Corporation | Endoscope with detachable sheath |
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