JPH08159998A - Humidity sensing element - Google Patents
Humidity sensing elementInfo
- Publication number
- JPH08159998A JPH08159998A JP30382794A JP30382794A JPH08159998A JP H08159998 A JPH08159998 A JP H08159998A JP 30382794 A JP30382794 A JP 30382794A JP 30382794 A JP30382794 A JP 30382794A JP H08159998 A JPH08159998 A JP H08159998A
- Authority
- JP
- Japan
- Prior art keywords
- moisture
- pts
- monomer
- humidity sensing
- solution
- 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.)
- Withdrawn
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、空気中の水分量に応じ
た電気抵抗値の変化によって湿度を検出する感湿素子に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a humidity sensitive element for detecting humidity by changing the electric resistance value according to the amount of water in the air.
【０００２】[0002]
【従来の技術】従来から広く一般に用いられている感湿
素子は、絶縁基板上に設けた一対の電極間に反応性カチ
オニックモノマーを含む高分子を重合させた共重合体で
成る感湿膜が設けられ、その感湿膜の電気抵抗値の変化
によって湿度を検出するようになっている（特開昭５５
−１０５０２号公報）。この種の感湿素子は、反応性カ
チオニックモノマーとして２−ヒドロキシ−３−メタク
リルオキシプロピルトリメチルアンモニウムクロライド
を用いており、これに重合開始剤として過酸化ベンゾイ
ル、アルコールとしてメタノールを加えてそれらを重合
させ、その重合体溶液を一対の電極が設けられた絶縁基
板の表面に塗布して感湿膜を形成している。2. Description of the Related Art A moisture sensitive element that has been widely and conventionally used is a moisture sensitive film made of a copolymer obtained by polymerizing a polymer containing a reactive cationic monomer between a pair of electrodes provided on an insulating substrate. Is provided, and the humidity is detected by the change of the electric resistance value of the moisture-sensitive film (Japanese Patent Laid-Open No. 55-55).
-10502). This type of moisture-sensitive element uses 2-hydroxy-3-methacryloxypropyltrimethylammonium chloride as a reactive cationic monomer, to which benzoyl peroxide as a polymerization initiator and methanol as an alcohol are added to polymerize them. Then, the polymer solution is applied to the surface of an insulating substrate provided with a pair of electrodes to form a moisture sensitive film.
【０００３】[0003]
【発明が解決しようとする課題】しかし、反応性カチオ
ニックモノマーとして２−ヒドロキシ−３−メタクリル
オキシプロピルトリメチルアンモニウムクロライドを用
いた高分子皮膜で成る感湿膜は、耐水性が低く、結露な
どによってポリマーに濡れが生ずるとそのポリマー自身
が膨潤してしまうという欠点があった。このため、図２
のグラフに示すように、感湿素子の初期感湿特性（Ａ）
と、浸水試験（浸水１０分・１０サイクル）経過後の感
湿特性（Ｂ）との間にも大きな差が生じ、それが検出誤
差を生ずる原因となっていた。また、結露などによる水
濡れの状態が長く続くと、感湿膜が絶縁基板の表面から
剥離してしまうという欠点もあり、それが耐久寿命を短
くする原因の一つとなっていた。However, a moisture-sensitive film composed of a polymer film using 2-hydroxy-3-methacryloxypropyltrimethylammonium chloride as a reactive cationic monomer has a low water resistance and is subject to dew condensation or the like. There is a drawback that when the polymer is wet, the polymer itself swells. Therefore, FIG.
As shown in the graph, the initial moisture sensitivity characteristics (A) of the moisture sensitive element
And a moisture-sensitive characteristic (B) after the immersion test (immersion for 10 minutes and 10 cycles), a large difference was caused, which caused a detection error. In addition, there is a drawback that the moisture sensitive film is peeled off from the surface of the insulating substrate when the condition of being wet with water due to dew condensation continues for a long time, which is one of the causes for shortening the durable life.
【０００４】なお、耐水性を向上させるために、２−ヒ
ドロキシ−３−メタクリルオキシプロピルトリメチルア
ンモニウムクロライドを重合させて成る重合体溶液を絶
縁基板上に塗布し乾燥して焼き付けた後、その上から重
クロム酸アンモン等の重クロム酸塩溶液を塗布してベー
キングし、それに紫外線などを照射して架橋処理を施す
ことも行われているが、このような処理を施すと、感湿
素子の応答性や再現性などが損なわれるおそれがある。In order to improve the water resistance, a polymer solution obtained by polymerizing 2-hydroxy-3-methacryloxypropyltrimethylammonium chloride is applied on an insulating substrate, dried and baked, and then from above. It is also possible to apply a dichromate solution such as ammonium dichromate and bake it, and then irradiate it with ultraviolet rays to subject it to cross-linking treatment. Property and reproducibility may be impaired.
【０００５】そこで本発明は、感湿素子の応答性や再現
性などの基本特性を損なわずに、耐水性・耐結露性に優
れた感湿素子を提供することを技術的課題としている。Therefore, it is a technical object of the present invention to provide a moisture sensitive element having excellent water resistance and dew condensation resistance without impairing the basic characteristics such as responsiveness and reproducibility of the moisture sensitive element.
【０００６】[0006]
【課題を解決するための手段】この課題を解決するため
に、本発明は、絶縁基板上に設けた一対の電極間に反応
性カチオニックモノマーを含む高分子を重合させた共重
合体で成る感湿膜が設けられた感湿素子において、前記
反応性カチオニックモノマーとして塩化メタクリル酸エ
チルトリメチルアンモニウムクロライドを用いたことを
特徴とする。In order to solve this problem, the present invention comprises a copolymer obtained by polymerizing a polymer containing a reactive cationic monomer between a pair of electrodes provided on an insulating substrate. A moisture-sensitive element provided with a moisture-sensitive film is characterized in that ethyl methacrylate trimethylammonium chloride chloride is used as the reactive cationic monomer.
【０００７】[0007]
【作用】反応性カチオニックモノマーとして塩化メタク
リル酸エチルトリメチルアンモニウムクロライドを用い
た共重合体で成る感湿膜は、耐水性に優れており、結露
によって膨潤したり絶縁基板上から剥離するおそれがな
いことが実験により確認された。[Function] A moisture sensitive film made of a copolymer using ethyl methacrylate trimethylammonium chloride chloride as a reactive cationic monomer has excellent water resistance and does not swell due to dew condensation or peel off from the insulating substrate. It was confirmed by the experiment.
【０００８】[0008]
【実施例】以下、本発明の実施例について具体的に説明
する。なお、図１は本発明による感湿素子の感湿特性を
示すグラフである。Embodiments of the present invention will be specifically described below. Note that FIG. 1 is a graph showing the humidity-sensitive characteristics of the humidity-sensitive element according to the present invention.
【０００９】本発明による感湿素子は、絶縁基板上に設
けた一対の電極間に反応性カチオニックモノマーを含む
高分子を重合させた共重合体で成る感湿膜が設けられた
点において、従来の感湿素子と共通するが、反応性カチ
オニックモノマーとして、従来一般に用いられている２
−ヒドロキシ−３−メタクリルオキシプロピルトリメチ
ルアンモニウムクロライドに代えて、塩化メタクリル酸
エチルトリメチルアンモニウムクロライドを用いた点に
特徴がある。つまり、本発明は、反応性カチオニックモ
ノマーとして、塩化メタクリル酸エチルトリメチルアン
モニウムクロライドを例えば１０〜３０部用い、これに
ビニルモノマーとしてメタクリル酸ｎ−ブチルモノマー
７０〜９０部、触媒として過酸化ベンゾイル２部、アル
コールとしてエタノール５０部を用いて、それらを反応
容器内に入れて約７０℃に加熱保持し、約３時間共重合
させる。In the moisture-sensitive element according to the present invention, a moisture-sensitive film made of a copolymer obtained by polymerizing a polymer containing a reactive cationic monomer is provided between a pair of electrodes provided on an insulating substrate. Although commonly used as a conventional moisture sensitive element, it has been commonly used as a reactive cationic monomer.
It is characterized in that ethyl methacrylate trimethylammonium chloride chloride was used instead of -hydroxy-3-methacryloxypropyl trimethylammonium chloride. That is, the present invention uses, for example, 10 to 30 parts of ethyl trimethyl ammonium chloride chloride as a reactive cationic monomer, 70 to 90 parts of n-butyl methacrylate monomer as a vinyl monomer, and benzoyl peroxide 2 as a catalyst. Parts, and 50 parts of ethanol as alcohol, they are put in a reaction vessel, heated and maintained at about 70 ° C., and copolymerized for about 3 hours.
【００１０】そして、その共重合によって得られた重合
体溶液を、アセトン等の溶液に添加して重合体の粉末を
沈澱させ、その沈澱した粉末を取り出して乾燥させる。
次に、その乾燥した粉末を合成樹脂溶液中に混入して感
湿膜を形成するための塗布液を製出する。この塗布液中
に、一対の櫛歯状電極が対向配設された感湿素子用の絶
縁基板を浸漬して、その絶縁基板の表面に薄膜状に付着
させ、それを１００℃の雰囲気中で約１２時間加熱乾燥
させて感湿膜を形成する。Then, the polymer solution obtained by the copolymerization is added to a solution such as acetone to precipitate a polymer powder, and the precipitated powder is taken out and dried.
Next, the dried powder is mixed into a synthetic resin solution to produce a coating solution for forming a moisture sensitive film. An insulating substrate for a moisture-sensitive element, in which a pair of comb-teeth-shaped electrodes are opposed to each other, is dipped in this coating solution and attached in a thin film form on the surface of the insulating substrate, which is then placed in an atmosphere of 100 ° C It is dried by heating for about 12 hours to form a moisture sensitive film.
【００１１】以上の如くして得られた感湿素子は、従来
品に比べて耐水性が著しく優れており、特に実施例のよ
うに、塩化メタクリル酸エチルトリメチルアンモニウム
クロライド１０〜３０部、メタクリル酸ｎ−ブチルモノ
マー７０〜９０部の比率で重合させた共重合体は、耐水
性・耐結露性が格段に良く、水中に約３０分間放置して
も、全く溶解しないし、膨潤もしない。また、図１のグ
ラフに示すように、感湿素子の初期感湿特性（Ａ）と、
浸水試験（浸水１０分・１０サイクル）経過後の感湿特
性（Ｂ）とを比較しても、両者間に殆ど差はなかった。
したがって、従来のように感湿膜の上から耐水性を付与
するための架橋処理などを施す必要がないので、感湿素
子の応答性や再現性などの基本特性を損なわずに耐水性
・耐結露性を向上させることができる。The moisture-sensitive element obtained as described above is remarkably excellent in water resistance as compared with the conventional product. Particularly, as in Examples, 10 to 30 parts of ethyl trimethylammonium chloride chloride and methacrylic acid are used. The copolymer obtained by polymerizing the n-butyl monomer at a ratio of 70 to 90 parts is remarkably excellent in water resistance and dew condensation resistance, and does not dissolve or swell even if left in water for about 30 minutes. Further, as shown in the graph of FIG. 1, the initial moisture sensitivity characteristic (A) of the moisture sensitive element,
Comparing the moisture-sensitive property (B) after the passage of the water immersion test (10 minutes of water immersion for 10 cycles), there was almost no difference between the two.
Therefore, unlike the conventional method, it is not necessary to perform a cross-linking treatment from the top of the moisture sensitive film to impart water resistance. The dew condensation property can be improved.
【００１２】[0012]
【発明の効果】以上のように、本発明によれば、反応性
カチオニックモノマーを含む高分子を重合させた共重合
体で感湿膜を形成するタイプの感湿素子に関して、その
応答性や再現性などの基本特性を損なわずに、感湿膜の
耐水性・耐結露性を著しく向上させることができるとい
う大変優れた効果がある。As described above, according to the present invention, the responsiveness and sensitivity of the moisture-sensitive element of the type in which a moisture-sensitive film is formed by a copolymer obtained by polymerizing a polymer containing a reactive cationic monomer It has a very excellent effect that the moisture resistance and the condensation resistance of the moisture-sensitive film can be remarkably improved without impairing the basic characteristics such as reproducibility.
【図１】本発明による感湿素子の感湿特性を示すグラ
フ。FIG. 1 is a graph showing the humidity-sensitive characteristics of a humidity-sensitive element according to the present invention.
【図２】従来の感湿素子の感湿特性を示すグラフ。FIG. 2 is a graph showing the humidity sensing characteristics of a conventional humidity sensing element.
Claims (2)
性カチオニックモノマーを含む高分子を重合させた共重
合体で成る感湿膜が設けられた感湿素子において、前記
反応性カチオニックモノマーとして塩化メタクリル酸エ
チルトリメチルアンモニウムクロライドを用いたことを
特徴とする感湿素子。1. A moisture-sensitive element provided with a moisture-sensitive film made of a copolymer obtained by polymerizing a polymer containing a reactive cationic monomer between a pair of electrodes provided on an insulating substrate. A moisture-sensitive element characterized by using ethyl methacrylic acid trimethyl ammonium chloride chloride as a nick monomer.
ルトリメチルアンモニウムクロライド１０〜３０部に、
メタクリル酸ｎ−ブチルモノマー７０〜９０部の比率で
重合させた共重合体である請求項１記載の感湿素子。2. The copolymer is added to 10 to 30 parts of ethyl trimethylammonium chloride chloride chloride,
The moisture-sensitive element according to claim 1, which is a copolymer polymerized at a ratio of 70 to 90 parts of n-butyl methacrylate monomer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30382794A JPH08159998A (en) | 1994-12-07 | 1994-12-07 | Humidity sensing element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30382794A JPH08159998A (en) | 1994-12-07 | 1994-12-07 | Humidity sensing element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08159998A true JPH08159998A (en) | 1996-06-21 |
Family
ID=17925790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30382794A Withdrawn JPH08159998A (en) | 1994-12-07 | 1994-12-07 | Humidity sensing element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08159998A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125523A (en) * | 2021-04-19 | 2021-07-16 | 苏州大学 | Humidity sensor based on PAAm flexible hydrogel and preparation method thereof |
| US11813358B2 (en) | 2019-06-07 | 2023-11-14 | Regents Of The University Of Michigan | Lipid nanodisc formation by polymers having a pendant hydrophobic group |
-
1994
- 1994-12-07 JP JP30382794A patent/JPH08159998A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11813358B2 (en) | 2019-06-07 | 2023-11-14 | Regents Of The University Of Michigan | Lipid nanodisc formation by polymers having a pendant hydrophobic group |
| CN113125523A (en) * | 2021-04-19 | 2021-07-16 | 苏州大学 | Humidity sensor based on PAAm flexible hydrogel and preparation method thereof |
| CN113125523B (en) * | 2021-04-19 | 2023-08-11 | 苏州大学 | Humidity sensor based on PAAm flexible hydrogel and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020305 |