JPH0535007B2 - - Google Patents
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- Publication number
- JPH0535007B2 JPH0535007B2 JP62173436A JP17343687A JPH0535007B2 JP H0535007 B2 JPH0535007 B2 JP H0535007B2 JP 62173436 A JP62173436 A JP 62173436A JP 17343687 A JP17343687 A JP 17343687A JP H0535007 B2 JPH0535007 B2 JP H0535007B2
- Authority
- JP
- Japan
- Prior art keywords
- electret
- sheet
- coulombs
- electret sheet
- sulfide
- 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.)
- Expired - Fee Related
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- Filtering Materials (AREA)
- Electrostatic Separation (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Artificial Filaments (AREA)
- Nonwoven Fabrics (AREA)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
本発明は、特に長期にわたつて安定で高い電荷
を保持するポリ芳香族サルフアイドエレクトレツ
トシート状物に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention particularly relates to a polyaromatic sulfide electret sheet material that is stable and retains a high charge over a long period of time.
＜従来の技術＞
従来、高分子からなるエレクトレツトシート状
物は、フイルムとして各種音響素子に用いられて
いるほか、繊維状シートとして、その電気的作用
を利用した各種フイルター、ワイパー等のクリー
ニング用途に利用されている。特にエレクトレツ
トの電気的な集塵能力を利用したエアフイルター
用途には、フイルムを開繊し、カーデイングによ
つて布帛状にしたもの、紡糸直後に高電圧を印加
し、エレクトレツト化かれた繊維を捕集してウエ
ブを得るもの、紡糸により直接不繊布を得、しか
る後に印加処理を施してエレクトレツトシートを
得るもの等、各種のエレクトレツトシート状物が
提案されている。これらのシート状物を構成する
高分子重合体は主にはポリプロピレン、ポリエチ
レン等のポリオレフイン、もしくはフツ化ビニ
ル、フツ化ビニリデン、三フツ化エチレン、四フ
ツ化エチレン等のフツ化エチレン重合体あるいは
これらの共重合体である。しかし、これらの高分
子エレクトレツトシート状物では、印加直後には
大きな保持電荷量を持つていても、印加処理から
時間を経るに従つて電荷が減衰し、該シート状物
の性能が低下する。従来の高分子エレクトレツト
シート状物は、この経時変化の点において満足で
きるものではなかつた。<Prior art> Conventionally, electret sheets made of polymers have been used as films in various acoustic devices, and also as fibrous sheets for cleaning various filters, wipers, etc. using their electrical action. It is used for. In particular, for air filter applications that utilize the electrical dust collection ability of electrets, there are two types of fibers: those that are made into fabric by opening a film and carding, and those that are made into electret fibers by applying a high voltage immediately after spinning. Various electret sheet-like products have been proposed, such as those that obtain webs by collecting nonwoven fabrics, and those that obtain nonwoven fabrics directly by spinning and then perform an application treatment to obtain electret sheets. The polymers constituting these sheet materials are mainly polyolefins such as polypropylene and polyethylene, or ethylene fluoride polymers such as vinyl fluoride, vinylidene fluoride, ethylene trifluoride, and ethylene tetrafluoride, or these. It is a copolymer of However, even though these polymer electret sheet-like materials have a large amount of retained charge immediately after application, the charge attenuates over time after the application process, and the performance of the sheet-like material deteriorates. . Conventional polymer electret sheet materials have not been satisfactory in terms of this change over time.
＜発明が解決しようとする問題点＞
本発明者らは上記欠点のないエレクトレツトシ
ート状物について鋭意検討した結果、本発明に到
達した。特に、高い保持電荷量とその経時安定性
を兼ね備えたエレクトレツトシート状物を提供す
ることを目的とする。<Problems to be Solved by the Invention> The present inventors have conducted intensive studies on electret sheet-like products that do not have the above-mentioned drawbacks, and as a result, have arrived at the present invention. In particular, it is an object of the present invention to provide an electret sheet-like material that has both a high amount of retained charge and its stability over time.
＜問題点を解決するための手段＞ 本発明は次の構成を有する。<Means to solve the problem> The present invention has the following configuration.
(1) 表面電荷密度が少なくとも５×10-11クーロ
ン／cm2以上であることを特徴とするポリ芳香族
サルフアイドエレクトレツトシート状物。(1) A polyaromatic sulfide electret sheet having a surface charge density of at least 5×10 −11 coulombs/cm 2 or more.
(2) 該シート状物の結晶化度が、少なくとも10％
以上である特許請求の範囲第１項に記載のポリ
芳香族サルフアイドエレクトレツトシート状
物。(2) The crystallinity of the sheet-like material is at least 10%.
The polyaromatic sulfide electret sheet material according to claim 1, which is as described above.
(3) 該シート状物の体積抵抗率が少なくとも１×
1017Ωcm以上である特許請求の範囲第１項に記
載のポリ芳香族サルフアイドエレクトレツトシ
ート状物。(3) The volume resistivity of the sheet-like material is at least 1×
The polyaromatic sulfide electret sheet material according to claim 1, which has a resistance of 10 17 Ωcm or more.
(4) 該シート状物の形状がメルトブロー不織布で
ある特許請求の範囲第１項に記載のポリ芳香族
サルフアイドエレクトレツトシート状物。(4) The polyaromatic sulfide electret sheet material according to claim 1, wherein the sheet material is a melt-blown nonwoven fabric.
本発明の特徴は、エレクトレツトシート状物の
構成材料として、ポリ芳香族サルフアイドを用い
ることにより、従来にない高い保持電荷量と保持
電荷の経時安定性および耐熱性、易加工性の全て
を兼ね備えたエレクトレツトシート状物を提供す
ることにある。 The feature of the present invention is that by using polyaromatic sulfide as the constituent material of the electret sheet, it has an unprecedented high amount of retained charge, stability of retained charge over time, heat resistance, and easy processability. An object of the present invention is to provide an electret sheet-like product.
本発明におけるポリ芳香族サルフアイドとは、
基本的には−Ｒ−Ｓ−（但し、Ｒはフエニレン、
ビフエニレン、ナフタレン、ビフエニレンエーテ
ル、ジフエニルケトン）を繰り返し単位として構
成される重合体であつて、Ｒの一部もしくは全部
が、それらの炭素数１−６の低級アルキル基置換
誘導体であつてもよく、また、分子鎖の一部に分
岐を持つものでもよい。 The polyaromatic sulfide in the present invention is
Basically -R-S- (where R is phenylene,
biphenylene, naphthalene, biphenylene ether, diphenyl ketone) as repeating units, in which part or all of R may be a lower alkyl group-substituted derivative having 1 to 6 carbon atoms. , or may have a branch in a part of the molecular chain.
分子鎖中の硫黄原子は、その一部或いは全部が
スルホン化されたものであつてもよい。 Some or all of the sulfur atoms in the molecular chain may be sulfonated.
シート状物の形状としてはフイルム、織編物、
不織布等が挙げられ、それぞれの使用目的によ
り、最も適する形状を選択することができる。特
に、ドレープ性に優れ、かつ保持電荷の経時安定
性の優れた形状としてメルトブロー不織布があげ
られる。 Forms of sheet-like products include films, woven and knitted fabrics,
Examples include non-woven fabrics, and the most suitable shape can be selected depending on the purpose of use. In particular, melt-blown nonwoven fabrics are examples of shapes that have excellent drape properties and excellent stability of retained charge over time.
ポリ芳香族サルフアイドは、形成後、そのガラ
ス転移温度以上に加熱することにより、急速に結
晶化が進み、収縮する性質を持つていることが知
られており、本発明におけるシート状物も、使用
時の環境に対しての寸法安定性を確保する為には
適当な張力下で熱処理することが好ましい。この
ときの処理温度としては、85℃以上、さらに好ま
しくは100℃以上が良い。該重合体の熱処理によ
る結晶化は、結晶・非晶質界面等、注入電荷のト
ラツプ部位を増加させるので、エレクトレツト化
処理を施した後の保持電荷量及び保持電荷の経時
安定性の点からも好ましい。 It is known that polyaromatic sulfide has the property of rapidly crystallizing and shrinking when heated above its glass transition temperature after formation, and the sheet-like material in the present invention can also be used. In order to ensure dimensional stability against the environmental conditions, it is preferable to perform heat treatment under appropriate tension. The processing temperature at this time is preferably 85°C or higher, more preferably 100°C or higher. Crystallization by heat treatment of the polymer increases the number of trap sites for injected charges, such as crystal/amorphous interfaces, so from the viewpoint of the amount of retained charge after electrification treatment and the stability of retained charge over time, is also preferable.
本発明に用いるポリ芳香族サルフアイドには、
滑剤、安定化剤等、各種添加剤が含まれていても
よいが、その体積抵抗率としては、１×1017Ωcm
以上、好ましくは１×1018Ωcm以上が良い。体積
抵抗率で１×1017Ωcm未満のものは、シート状物
の内部で電荷の移動が生じやすく、エレクトレツ
トシート状物の経時安定性の点で問題を生じる。 The polyaromatic sulfide used in the present invention includes:
Various additives such as lubricants and stabilizers may be included, but the volume resistivity is 1×10 17 Ωcm.
Above, preferably 1×10 18 Ωcm or more. If the volume resistivity is less than 1×10 17 Ωcm, charge movement tends to occur inside the sheet-like material, causing a problem in terms of stability over time of the electret sheet-like material.
本発明のエレクトレツトシート状物の電気的性
能は分極電荷量が大きい方がすぐれており、少な
くとも５×10-11クーロン／cm2、さらに好ましく
は５×10-10クーロン／cm2以上の表面電荷密度を
有するのがよい。 The electrical performance of the electret sheet material of the present invention is better when the amount of polarization charge is larger, and the surface area has a polarization charge of at least 5×10 -11 coulombs/cm 2 , more preferably 5×10 -10 coulombs/cm 2 or more. It is preferable to have a charge density.
＜実施例＞
積極的には分岐化モノマを含まないポリフエニ
レンサルフアイド重合体をメルトブロー紡糸し、
目付45ｇ／m2、平均繊度0.1デニールのメルトブ
ロー不織布を得た。得られた不織布を張力下120
℃で10分間熱処理した後、接地された金属板上で
20秒間正のコロナ放電下にさらし、エレクトレツ
トメルトブロー不織布を得た。該エレクトレツト
シート状物の表面電荷密度を測定する為に、該シ
ート状物の一面を接地された金属板に接触させ、
他の一面に容量３×10-8（フアラツド）のコンデ
ンサーを介して接地された面積50cm2の金属板を接
触させて、コンデンサー両極間の電位差を測定
し、次式から、該エレクトレツト不織布の表面電
荷密度を求めた。<Example> A polyphenylene sulfide polymer containing no branched monomer was actively melt-blown spun,
A melt-blown nonwoven fabric with a basis weight of 45 g/m 2 and an average fineness of 0.1 denier was obtained. The resulting nonwoven fabric was placed under tension of 120
After heat treatment at ℃ for 10 minutes, on a grounded metal plate
It was exposed to positive corona discharge for 20 seconds to obtain an electret melt-blown nonwoven fabric. In order to measure the surface charge density of the electret sheet, one side of the sheet is brought into contact with a grounded metal plate,
A metal plate with an area of 50 cm 2 grounded via a capacitor with a capacity of 3 × 10 -8 (farads) was brought into contact with the other surface, and the potential difference between the two electrodes of the capacitor was measured. The surface charge density was determined.
表面電荷密度（クーロン／cm2）＝Ｃ×Ｖ／Ｓ
（ただし、Ｃ（フアラツド）はコンデンサーの容
量、Ｖ(V)は測定した電位差、Ｓ（cm2）は測定に用
いる金属板の面積。）
印加１日後の６つのサンプルについて、上記の
方法で測定した表面電荷密度の平均値は4.9×
10-10クーロン／cm2（最小1.7×10-10クーロン／
cm2、最大7.0×10-10クーロン／cm2）であつた。該
サンプルを35日間アルミホイル中で保管した後、
同様の方法で測定した表面電荷密度の平均値は
8.5×10-10クーロン／cm2（最小4.5×10-10クーロ
ン／cm2、最大13.5×10-10クーロン／cm2）であり、
印加１日後と比較して表面電荷密度の低下は認め
られなかつた。 Surface charge density (coulombs/cm 2 )=C×V/S (where C (farad) is the capacitance of the capacitor, V (V) is the measured potential difference, and S (cm 2 ) is the area of the metal plate used for measurement. ) One day after application, the average value of the surface charge density measured using the above method was 4.9×
10 -10 coulombs/cm 2 (minimum 1.7×10 -10 coulombs/
cm 2 , maximum 7.0×10 −10 coulombs/cm 2 ). After storing the sample in aluminum foil for 35 days,
The average surface charge density measured using a similar method is
8.5×10 −10 coulombs/cm 2 (minimum 4.5×10 −10 coulombs/cm 2 , maximum 13.5×10 −10 coulombs/cm 2 ),
No decrease in surface charge density was observed compared to one day after application.
＜比較例＞
目付20ｇ／m2、平均繊度0.04デニールのポリプ
ロピレンメルトブロー不織布の表裏面をそれぞれ
正負のコロナ放電下で処理し、エレクトレツト不
織布を得た。該不織布の表面電荷密度を実施例１
の記載の方法で測定したところ印加直後は13.4×
10-10クーロン／cm2と高い値を示したが、アルミ
ホイル中で35日経過した時点では約38％の電荷の
減衰が見られ、さらに25日経過後には、初期電荷
量の約46％が失われ、その表面電荷密度は7.3×
10-10クーロン／cm2であつた。<Comparative Example> The front and back surfaces of a polypropylene melt-blown nonwoven fabric having a basis weight of 20 g/m 2 and an average fineness of 0.04 denier were each treated under positive and negative corona discharge to obtain an electret nonwoven fabric. The surface charge density of the nonwoven fabric was determined in Example 1.
When measured using the method described in , it was 13.4× immediately after application.
It showed a high value of 10 -10 coulombs/cm 2 , but after 35 days in aluminum foil, the charge attenuated by about 38%, and after another 25 days, it decreased to about 46% of the initial charge. is lost, and its surface charge density is 7.3×
It was 10 -10 coulombs/ cm2 .
＜発明の効果＞
本発明のポリ芳香族サルフアイドエレクトレツ
トシート状物は、従来のエレクトレツトシート状
物に比較して、長期間にわたつて安定した高い電
荷を保持し、しかも耐薬品性、耐熱性にも優れ
る。このため、本発明のポリ芳香族サルフアイド
エレクトレツトシート状物は、フイルター素材、
吸着素材、マスク等各種の用途において、特にそ
れらの特殊雰囲気下での使用時において有効であ
る。<Effects of the Invention> Compared to conventional electret sheets, the polyaromatic sulfide electret sheet of the present invention retains a stable high charge over a long period of time, and has chemical resistance and It also has excellent heat resistance. Therefore, the polyaromatic sulfide electret sheet material of the present invention has a filter material,
It is effective in various applications such as adsorption materials and masks, especially when used in special atmospheres.
Claims (1)
ン／cm2以上であることを特徴とするポリ芳香族サ
ルフアイドエレクトレツトシート状物。 ２ 該シート状物の結晶化度が、少なくとも10％
以上である特許請求の範囲第１項に記載のポリ芳
香族サルフアイドエレクトレツトシート状物。 ３ 該シート状物の体積抵抗率が少なくとも１×
1017Ωcm以上である特許請求の範囲第１項に記載
のポリ芳香族サルフアイドエレクトレツトシート
状物。 ４ 該シート状物の形状がメルトブロー不織布で
ある特許請求の範囲第１項に記載のポリ芳香族サ
ルフアイドエレクトレツトシート状物。[Scope of Claims] 1. A polyaromatic sulfide electret sheet material having a surface charge density of at least 5×10 −11 coulombs/cm 2 or more. 2 The crystallinity of the sheet-like material is at least 10%
The polyaromatic sulfide electret sheet material according to claim 1, which is as described above. 3 The sheet-like material has a volume resistivity of at least 1×
The polyaromatic sulfide electret sheet material according to claim 1, which has a resistance of 10 17 Ωcm or more. 4. The polyaromatic sulfide electret sheet material according to claim 1, wherein the sheet material is a melt-blown nonwoven fabric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62173436A JPS6418421A (en) | 1987-07-10 | 1987-07-10 | Polyaromatic-sulfide electret sheet-like matter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62173436A JPS6418421A (en) | 1987-07-10 | 1987-07-10 | Polyaromatic-sulfide electret sheet-like matter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6418421A JPS6418421A (en) | 1989-01-23 |
| JPH0535007B2 true JPH0535007B2 (en) | 1993-05-25 |
Family
ID=15960431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62173436A Granted JPS6418421A (en) | 1987-07-10 | 1987-07-10 | Polyaromatic-sulfide electret sheet-like matter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6418421A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102639774B (en) * | 2009-12-09 | 2015-12-09 | 东丽株式会社 | The manufacture method of long fiber nonwoven fabrics |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5716954A (en) * | 1980-06-27 | 1982-01-28 | Toray Industries | Long fiber nonwoven fabric comprising aromatic sulfide polymer fiber and method |
-
1987
- 1987-07-10 JP JP62173436A patent/JPS6418421A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6418421A (en) | 1989-01-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |