Hygrometer
Abstract
(57) A summary and the purpose Water and alcohol are made to generate non-溶な感湿物質 by the reaction of the reduction product of molybdic acid salt, and a lanthanum chloride, and the sensor of humidity detection or hygrometry is obtained using this. Composition The ingredient which dissolves in alcohol is extracted from the solid which returns and generates molybdic acid アンモ neum, The water and alcohol which 水溶物 and chlorination Ranta liquid of 残査 which evaporated alcohol are made to react, and are generated are made to adhere to a base with an electrode, and non-溶な感湿物 is used for them as a sensor of humidity detection or hygrometry by change of the electrical resistance. An example of the humidity at the time of using as a sensor and the relation of electrical resistance is shown in a selection figure.
Term
No projected expiry on record.
- Priority and filed
- Published
- Today
2 claims: 2 independent, 0 dependent
- 1[Claims] [Claim 1] Methyl alcohol containing oxalic acid is added to a solid product obtained by dissolving oxalic acid and ammonium molybdate in aqueous sulfite, adding 1amino 2naphthol tetrasulfonic acid, and drying after heating and reducing. Extract only the components to be dissolved, evaporate and dry the extract, add water after cooling and filter, add lanthanum chloride to the filtrate to generate a precipitate and filter, wash the residue with water, dry and turn it into alcohol. A moisture-sensitive substance that is insoluble in water and alcohol, which is obtained by dissolving and filtering again and drying the residue. 【特許請求の範囲】 【請求項1】 シュウ酸およびモリブデン酸アンモニウ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。
- 2A humidity sensor formed by adding a small amount of dihydroxydiphenylsilane together with methyl alcohol to the above fine particles of a moisture-sensitive substance, mixing them while grinding them in a mortar or the like, and applying this to a sensor substrate having electrodes. 【請求項2】 上の感湿物の微粒子にメチルアルコール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。
Independent claims2
30 paragraphs, as filed
Description: TECHNICAL FIELD [Detailed description of the invention]
【0001】
[Industrial application field]
The present invention relates to a humidity sensitive substance and a humidity sensor for detecting and measuring humidity.
【0002】
[Conventional technology]
Conventionally, as a method for measuring the humidity of a humidity sensor, there are a method using a change in electrical resistance of a polymer film or a ceramic film, a method using a change in capacitance of a polymer thin film, and the like, each of which has advantages and disadvantages. A humidity sensor using a moisture-sensitive substance in which lanthanum chloride is added as a wetting agent to a molybdenum-based compound has already been patented, but this humidity-sensitive substance contains a water-soluble component.
【0003】
[Problems to be Solved by the Invention]
In a sensor using the above-mentioned molybdenum compound, the state of the surface of the sensor changes when measured under conditions of dew condensation or similar due to a water-soluble component, and therefore the characteristics of the sensor tend to change. Moreover, since the water-soluble component has 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】
[Means to solve 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 generated, and this precipitate is separated, washed thoroughly with water, and then dried. Is humidity sensitive, and its electrical resistance changes with humidity. Therefore, if a humidity sensor is made using this, the humidity-sensitive substance is insoluble in water, and the above-mentioned problems can be solved at once.
【0005】
[Example]
Next, an example of carrying out the present invention will be described.
【0006】
Dissolve 100 parts of ammonium molybdate (same below weight ratio) and 70 parts of oxalic acid in 400 parts of sulfurous acid water (8%), add 6 parts of 1amino2naphthol-4sulfonic acid, and put in an acid-resistant container with a lid. Heat in a warm bath. After completion of the reduction reaction, the mixture is filtered, and the filtrate is further heated in a warm bath to evaporate to dryness. To this dry matter, add 290 parts of methyl alcohol and 42 parts of oxalic acid to completely dissolve the dissolved components, and filter the latter of the resulting light brown solution and light-colored insoluble residue. Remove. (Hereinafter, the methyl alcohol solution produced here is referred to as a stock solution. The method for producing the stock solution is known).
【0007】
Take 20 ml of the undiluted solution in a beaker and heat it in a warm bath to evaporate the alcohol content, and then heat it at a temperature of 105 to 110 degrees for a while to evaporate and remove most of the oxalic acid added earlier. Next, about 20 m of water is added to dissolve it, and insoluble matter is removed by filtration.
【0008】
An aqueous solution of lanthanum chloride is added dropwise to the above filtrate to complete precipitation, and then filtration is performed. The precipitate on the filter paper is thoroughly washed with water, dried together with the filter paper, dissolved in methyl alcohol and filtered again, and the residue is dried to obtain a moisture-sensitive substance insoluble in water and alcohol.
【0009】
Take the above powder in a mortar, add a small amount of disidroxidiphenylsilane dissolved in alcohol, mix while grinding, and when the appropriate condition is reached, apply a part thinly on a sensor base such as an alumina base with a comb-shaped electrode. And dry to get a humidity sensor. As an example, Fig. 1 shows the relationship between the electrical resistance and relative humidity of a sensor with a base of 5 mm in width and 7 mm in length.
【0010】
[Effect of the invention]
As explained above, a sensor using the previously patented molybdenum compound is made by making a moisture-sensitive substance that is insoluble in water from the molybdenum compound and lanthanum chloride and making a sensor using this. However, it prevents the tendency of its characteristics to change under high humidity and after long-term use, and the adverse effects of dew condensation.
[Simple explanation of drawings]
[Figure 1]
An example of the relationship between the logarithm of the electrical resistance of the sensor and the relative humidity according to the present invention. 1 Horizontal axis of relationship diagram Relative humidity% 2 Logarithm of electrical resistance (kiloohm) on the vertical axis of the relationship diagram 3 measurement points
Every citation, both ways
| Document | Relation | Office | Cited during |
|---|---|---|---|
| US6911005B2 | Cited by | United States of America | Applicant |
3 priority claims, no other members on record
Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 21405392 | Japan | A | |
| 4214053 | – | – | – |
| JP19920214053 | – | – | – |
Numbers
- Publication
- 6-58902
- Publication, DOCDB
- H0658902
- Publication, EPODOC
- JPH0658902
- Application
- 4214053
- Application, DOCDB
- 21405392
- Application, EPODOC
- JP19920214053
Titles3
- English
- HYGROMETER
- Japanese
- 【発明の名称】湿度センサ
- English
- [Title of Invention] Humidity sensor
Classification
- IPC, 2
- C01G39 00
- G01N27 12