JP2936591B2 - High-performance electret filter media - Google Patents
High-performance electret filter mediaInfo
- Publication number
- JP2936591B2 JP2936591B2 JP20106189A JP20106189A JP2936591B2 JP 2936591 B2 JP2936591 B2 JP 2936591B2 JP 20106189 A JP20106189 A JP 20106189A JP 20106189 A JP20106189 A JP 20106189A JP 2936591 B2 JP2936591 B2 JP 2936591B2
- Authority
- JP
- Japan
- Prior art keywords
- electret
- fine particles
- filter medium
- fiber
- present
- 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
Links
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はクリーンルームの空気清浄、ビルの空気調和
や工場排気の浄化用等のエアーフィルター、空気清浄
機、掃除機、複写機などのエアーフィルターやマスクな
どに用いることのできる高性能エレクトレット濾材に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an air filter for purifying air in a clean room, air conditioning of a building, and purifying factory exhaust, and an air filter for an air purifier, a vacuum cleaner, a copying machine, and the like. The present invention relates to a high-performance electret filter medium that can be used as a mask or a mask.
（従来の技術） 従来、エレクトレットフィルターには特公昭56−4729
9号公報に開示されているエレクトレットフィルターが
ある。このフィルターはフイルムをエレクトレット化
し、次いで小繊維化してシート化されるため、フィルタ
ーのもつ帯電量は大きいが、フイルムのスプリット幅を
狭く切ることが出来ないため、繊維が矩形で繊維の形状
による機械的捕集効果が小さく、これが原因でフィルタ
ーを長期にわたって使用すると静電気の中和現象によっ
て捕集効率が経時的に低下し捕集効率が回復しないと言
う問題があった。特公昭53−40073号公報に開示されて
いる絶縁フイルムをアース電極上に敷いて、その上に繊
維シートを置き、エレクトレット化する方法から作製さ
れるフィルターは繊維シートが多孔質のために帯電量が
低く、高い捕集効率が得られないと言う問題があった。(Prior art) Conventionally, electret filters have been known in Japanese Patent Publication No. 56-4729.
There is an electret filter disclosed in Japanese Patent No. This filter is formed into an electret film and then into small fibers to form a sheet.Thus, the filter has a large charge amount, but the split width of the film cannot be cut so narrow that the fiber is rectangular and the fiber shape is used. When the filter is used for a long time, there is a problem that the collection efficiency is reduced with time due to the neutralization phenomenon of static electricity, and the collection efficiency is not recovered. Japanese Patent Publication No. 53-40073 discloses a filter made by laying an insulating film on an earth electrode, placing a fiber sheet thereon, and electretizing the filter. However, there is a problem that high collection efficiency cannot be obtained.
（発明が解決しようとする問題点） 本発明はかかる従来技術における問題点すなわち長期
にわたって使用しても捕集効率が低下しない、高レベル
に帯電した高性能エレクトレット濾材の提供を目的とす
るものである。(Problems to be Solved by the Invention) An object of the present invention is to provide a problem in the prior art, that is, to provide a high-level electrified high-performance electret filter medium in which the collection efficiency does not decrease even after long-term use. is there.
（問題点を解決するための手段） 本発明はかかる問題点に鑑み、鋭意検討した結果、本
発明に到達したものである。(Means for Solving the Problems) The present invention has been made in view of such problems, and as a result of intensive studies, the present invention has been achieved.
本発明は、電荷保持構造体がエレクトレット繊維シー
トと微粒子から成るエレクトレット濾材において、該微
粒子を該繊維シートの一方の面に富に付着させ、該繊維
シートの２枚を該微粒子を富に付着させた面同志で貼り
合せたことを特徴とする高性能エレクトレット濾材であ
る。The present invention provides an electret filter medium in which the charge retaining structure is composed of an electret fiber sheet and fine particles, wherein the fine particles are richly attached to one surface of the fiber sheet, and two of the fiber sheets are richly attached to the fine particles. This is a high-performance electret filter medium characterized by being bonded together.
本発明において電荷保持構造体とは静電気放電によっ
て電荷を中和消失させることなく、電荷を安定凍結状態
に固定できる構造体である。In the present invention, the charge retention structure is a structure capable of fixing charges in a stable frozen state without neutralizing and eliminating charges by electrostatic discharge.
本発明におけるエレクトレット繊維シートと微粒子か
ら成る電荷保持構造体とは１本のエレクトレット繊維の
表面に多数個の微粒子が付着した構造体や微粒子の付着
したエレクトレット繊維が多数本交絡したバルク状やシ
ート状の構造体などがあり、これら構造体中に多量の電
荷を固定することによって高性能エレクトレット濾材と
なり得るものである。構造体中の電荷の固定位置はエレ
クトレット繊維および微粒子とそれらの接触界面があり
これら構造体において、微粒子はエレクトレット、非エ
レクトレットのいずれでもよいが、繊維はエレクトレッ
トであることが必須の要件である。繊維が非エレクトレ
ットである場合には構造体中での電荷安定性が著しく悪
く、高性能エレクトレット濾材として使えないものとな
る。In the present invention, the electret fiber sheet and the charge retention structure composed of fine particles are a structure in which a large number of fine particles adhere to the surface of one electret fiber or a bulk or sheet in which a large number of electret fibers with fine particles adhere to each other. And a high-performance electret filter medium can be obtained by fixing a large amount of charges in these structures. The fixed position of the electric charge in the structure includes the electret fibers and the fine particles and their contact interface. In these structures, the fine particles may be either electrets or non-electrets, but it is essential that the fibers be electrets. When the fiber is a non-electret, the charge stability in the structure is extremely poor, and the fiber cannot be used as a high-performance electret filter medium.
本発明において、高性能エレクトレット濾材はエレク
トレット繊維と微粒子のそれぞれに固定された電荷の総
量を超える電荷を安定的に保持するこができる。この現
象は荷電後、エレクトレット繊維と微粒子の相互作用に
よってそれら単独で保持される電荷以外に構造体中の接
触界面に電荷が保持されることによるものと推定され、
この点が従来のエレクトレット濾材と全く異なる本発明
における微粒子とエレクトレット繊維間の重要な作用効
果なのである。In the present invention, the high-performance electret filter medium can stably hold charges exceeding the total amount of charges fixed to each of the electret fibers and the fine particles. This phenomenon is presumed to be due to the charge being held at the contact interface in the structure in addition to the charge held alone by the interaction between the electret fiber and the fine particles after the charge,
This is an important effect between the fine particles and the electret fibers in the present invention, which is completely different from the conventional electret filter media.
更に重要なことは、こうした相互作用によって生じた
電荷は容易に中和消失することなく、安定的にエレクト
レット濾材に電荷保持されると言う点である。More importantly, the charge generated by such an interaction is not easily neutralized and disappears, but is stably retained in the electret filter medium.
本発明において、エレクトレット繊維シートへの微粒
子の付着量分布は該繊維シートの厚さ方向に一方に富
で、他方に貧に付着した指数関数的に激減する分布であ
り、該微粒子の富に付着した繊維シート面同志を貼り合
せることによって、高性能エレクトレット濾材は作製さ
れる。In the present invention, the distribution of the amount of the fine particles attached to the electret fiber sheet is a distribution which is rich in one direction in the thickness direction of the fiber sheet and is poorly attached to the other, and decreases exponentially. A high performance electret filter medium is manufactured by bonding the fiber sheet surfaces thus obtained.
本発明において、微粒子をエレクトレット繊維シート
の厚さ方向に貧富の付着量分布をもたせ、該繊維シート
の２枚をその富に付着した面同志で貼り合せると、エレ
クトレット濾材を長期間にわたって使用した場合、粉塵
による電荷の中和や電荷減衰によって濾材が保有してい
る電荷が失なわれたとしても、該繊維シートからの微粒
子の脱落や再飛散が起ることなく、濾材の性能が長期間
にわたって安定であると言う特徴を発揮する。In the present invention, when the fine particles are provided with a distribution of poor and rich adhesion in the thickness direction of the electret fiber sheet, and two of the fiber sheets are bonded together with the surfaces adhering to the rich, the electret filter medium is used for a long time. Even if the charge held by the filter medium is lost due to neutralization or charge decay of the dust due to dust, the performance of the filter medium can be maintained for a long time without dropping or re-scattering of the fine particles from the fiber sheet. Exhibits the characteristic of being stable.
繊維シートの貼り合せはエンボス熱溶着による貼り合
せ、あるいは接着剤シートを用いる貼り合せであること
が好ましい。The lamination of the fiber sheets is preferably lamination by emboss heat welding or lamination using an adhesive sheet.
本発明におけるエレクトレット繊維には、ポリプロピ
レン、ポリエチンレン、ポリ−３−メチル−１−ブテ
ン、ポリ−４−メチル−１−ペンテン、ポリ弗化ビニリ
デン、ポリテトラフロロエチレン、ポリカーボネート、
ポリスチレン、ポリ塩化ビニリデン、ポリ塩化ビニル、
ポリエチレンテレフタレート、ポリアミド、ポリアクリ
ロニトリル、ポリサルホン、ポリフェニレンオキサイド
等の絶縁性有機質繊維やホウケイ酸ガラス、石英ガラス
などの絶縁性無機繊維があるが好ましくはポリプロピレ
ン、ポリ−３−メチル−１−ブテン、ポリ−４−メチル
−１−ペンテン、ポリ弗化ビニリデン、ポリカーボネー
トなどである。In the electret fiber of the present invention, polypropylene, polyethylene, poly-3-methyl-1-butene, poly-4-methyl-1-pentene, polyvinylidene fluoride, polytetrafluoroethylene, polycarbonate,
Polystyrene, polyvinylidene chloride, polyvinyl chloride,
There are insulating organic fibers such as polyethylene terephthalate, polyamide, polyacrylonitrile, polysulfone, and polyphenylene oxide, and insulating inorganic fibers such as borosilicate glass and quartz glass, and preferably polypropylene, poly-3-methyl-1-butene and poly-. 4-methyl-1-pentene, polyvinylidene fluoride, polycarbonate and the like.
本発明におけるエレクトレット繊維は短繊維と長繊維
があり、その集合形態としては織物、編物や不織布など
がある。これらの繊維の断面形状は円形、三角形、矩
形、異形などがあり、その繊維径は100μｍ以下、好ま
しくは40μｍ以下、より好ましくは４μｍ以下である。The electret fibers in the present invention include short fibers and long fibers, and the aggregate forms include woven fabric, knitted fabric, and nonwoven fabric. The cross-sectional shape of these fibers is circular, triangular, rectangular, irregular, etc., and the fiber diameter is 100 μm or less, preferably 40 μm or less, more preferably 4 μm or less.
本発明において、エレクトレット繊維はその繊維表面
をあらかじめ紫外線、放射線のごとき高エネルギー線に
よる処理、酸アルカリ等の薬液処理や表面コーティング
処理を施すことによって、電荷の保持安定性、電荷の帯
電量向上をさせることができる。In the present invention, the electret fiber is treated in advance with a high-energy ray such as an ultraviolet ray or a radiation, a chemical treatment such as an acid alkali, or a surface coating treatment on the fiber surface to improve the charge holding stability and the charge amount of the charge. Can be done.
本発明における微粒子は無機質、有機質あるいはそれ
ら二種以上の混合された常温において固体の物質があ
り、具体的にはガラスなどのセラミックス微粒子、銅、
ニッケル、アルミニウムなどの金属や微粒子、酸化チタ
ン、酸化けい素、酸化鉄、チタン酸、バリウムなどの金
属酸化物微粒子、窒化ニッケル、窒化チタンなどの金属
窒化物微粒子カーボン、タルクなどの無機質微粒子、ス
テアリン酸、セバチン酸、アビエチン酸などのカルボン
酸やその金属塩やカルナウバーワックス、松やになどの
微粒子、ポリエチレン、ポリプロピレン、ポリエチレン
テフタレート、ポリアミド、ポリ弗化ビニリデン、ポリ
テトラフロロエチレン、ポリスチレン、ポリ塩化ビニ
ル、ポリ塩化ピニリデン、セルロース、ポリビニルアル
コールなどの有機質微粒子が挙げられるが好ましくは、
カーボン、アルミニウム、ポリエチレン、セバチン酸、
カルナウバーワックス、更に好ましくはセバチン酸、カ
ルナウバーワックスである。Fine particles in the present invention are inorganic, organic or a solid substance at room temperature mixed with two or more thereof, specifically, ceramic fine particles such as glass, copper,
Metal and fine particles such as nickel and aluminum, fine metal oxide particles such as titanium oxide, silicon oxide, iron oxide, titanic acid, and barium; fine metal nitride particles such as nickel nitride and titanium nitride; inorganic fine particles such as talc; and stearin Carboxylic acids such as acid, sebacic acid, abietic acid and the like, metal salts thereof, carnauba wax, fine particles such as pine wood, polyethylene, polypropylene, polyethylene terephthalate, polyamide, polyvinylidene fluoride, polytetrafluoroethylene, polystyrene, polychlorinated Vinyl, polyvinylidene chloride, cellulose, and organic fine particles such as polyvinyl alcohol, but preferably,
Carbon, aluminum, polyethylene, sebacic acid,
Carnauba wax, more preferably sebacic acid, carnauba wax.
本発明における微粒子の大きさは一次粒子として20μ
ｍ以下、好ましくは１μｍ以下、より好ましくは0.2μ
ｍ以下である。これら一次粒子は繊維表面に独立して個
々に付着していることが好ましいが、凝集した二次粒子
として付着していてもさしつかえない。The size of the fine particles in the present invention is 20 μm as primary particles.
m, preferably 1 μm or less, more preferably 0.2 μm
m or less. It is preferable that these primary particles are individually and individually attached to the fiber surface, but they may be attached as aggregated secondary particles.
本発明における微粒子の形状は球状、楕円状、立方体
状、直方体状、星状、針状、台形状などがある。The shape of the fine particles in the present invention includes a sphere, an ellipse, a cube, a cuboid, a star, a needle, a trapezoid, and the like.
本発明における微粒子の付着量はエレクトレット繊維
の重量に対して0.01〜20重量％、好ましくは0.05〜５重
量％、より好ましくは0.1〜１重量％である。微粒子の
大きさが小さければ小さい程、微粒子の単位重量あたり
の表面積は増え、エレクトレット繊維表面との接触界面
は増加するため、微粒子の付着量が少くても、高帯電量
化の効果は大きい。本発明において、エレクトレット繊
維に対する微粒子の付着にはエレクトレット繊維と微粒
子との一次結合あるいはエレクトレット繊維と微粒子と
の静電気、粘着、ファンデアワールスや毛管付着水によ
る結合などの二次結合が働いておりエレクトレット繊維
に付着している微粒子は濾材使用時の風圧や振動では容
易に再飛散することはない。The attached amount of the fine particles in the present invention is 0.01 to 20% by weight, preferably 0.05 to 5% by weight, more preferably 0.1 to 1% by weight based on the weight of the electret fiber. As the size of the fine particles is smaller, the surface area per unit weight of the fine particles increases, and the contact interface with the electret fiber surface increases. Therefore, even if the amount of the fine particles is small, the effect of increasing the charge amount is large. In the present invention, the attachment of the fine particles to the electret fibers is effected by a primary bond between the electret fibers and the fine particles or a secondary bond such as static electricity, adhesion between the electret fibers and the fine particles, bonding by van der Waals or capillary water, and the like. The fine particles adhering to the fibers are not easily re-scattered by the wind pressure or vibration when the filter medium is used.
本発明において、高性能エレクトレット濾材の前駆体
である繊維と微粒子との構造体はガス中に分散させた微
粒子を繊維に付着させたり、真空中で蒸発生成させた微
粒子を飛散させて繊維に付着させるなどの方法で作製さ
れる。高性能エレクトレット濾材の前駆体である繊維は
エレクトレット、非エレクトレットのいずれでもよく、
かつ繊維は単一繊維から集合形態としてのバルク状物や
シート状物がある。In the present invention, the structure of the fiber and the fine particles, which are the precursors of the high-performance electret filter medium, adheres the fine particles dispersed in a gas to the fibers or the fine particles evaporated and generated in a vacuum to adhere to the fibers. It is produced by a method such as a method such as The fiber which is the precursor of the high-performance electret filter medium may be electret or non-electret,
In addition, the fibers include a single fiber, a bulk material and a sheet material in an aggregate form.
本発明における高性能エレクトレット濾材は、かかる
構造体を荷電し、エレクトレット繊維と微粒子とから成
る電荷保持構造体として後、該微粒子の富に付着した繊
維シート面同志を２枚貼り合せることによって作製され
る。The high-performance electret filter medium of the present invention is manufactured by charging such a structure, forming a charge retaining structure composed of electret fibers and fine particles, and then bonding two fiber sheet surfaces that are rich in the fine particles to each other. You.
本発明において高性能エレクトレット濾材にする荷電
方法としてはコロナ荷電、電界荷電、熱間電界荷電、電
子線照射などがあるが、特にこれらに限定するものでは
なく、繊維と微粒子から成る構造体に電荷を注入し高帯
電量で電荷が安定に保持される荷電法であればいかなる
荷電法も用いることができる。コロナ放電、電界荷電の
場合は10kv/cm以上、好ましくは15kv/cm以上の電界強度
が適しており、電子線照射の場合は0.1〜1Mradの照射が
望ましい。In the present invention, as a charging method for a high-performance electret filter medium, there are corona charging, electric field charging, hot electric field charging, electron beam irradiation, etc., but not particularly limited thereto. Any charging method can be used as long as it is a charging method in which the charge is stably held at a high charge amount. In the case of corona discharge and electric field charging, an electric field strength of 10 kv / cm or more, preferably 15 kv / cm or more is suitable. In the case of electron beam irradiation, irradiation of 0.1 to 1 Mrad is desirable.
本発明において高性能エレクトレット濾材は（１）式
により求められる単繊維捕集効率比η／η０が1.5以上
を有する。In the present invention, the high-performance electret filter medium has a single fiber collection efficiency ratio η / η 0 determined by the formula (1) of 1.5 or more.
η／η０＝ln（１−Ｅ）/ln（１−E0） （１） ただし、 η0 :従来法で作製されるエレクトレット濾材の単繊
維捕集効率 η ：本発明の高帯電量エレクトレット濾材の単繊維
捕集効率 E0 ：従来法で作製されるエレクトレット濾材の実測
される粒子補集効率 Ｅ ：本発明の高帯電量エレクトレット濾材の実測さ
れる粒子捕集効率 ここにおいて、従来法で作製されるエレクトレット濾
材とは本発明における微粒子を繊維に付着させることな
く、本発明におけると同じ荷電方法でエレクトレット濾
材を作製することを意味する。η / η 0 = ln (1-E) / ln (1-E 0 ) (1) Where, η 0 : Efficiency of single fiber collection of electret filter medium produced by a conventional method η: High electrification amount electret of the present invention Single fiber collection efficiency of filter medium E 0 : Measured particle collection efficiency of electret filter medium manufactured by conventional method E: Measured particle collection efficiency of high charge amount electret filter medium of the present invention The produced electret filter medium means that the electret filter medium is produced by the same charging method as in the present invention without causing the fine particles of the present invention to adhere to fibers.
粒子捕集効率の測定は0.3μｍの直径のNacl粒子粒子
を線速5cm/secで試験用フィルターに供給したときの濾
材の上流側と下流側とNacl粒子濃度をレーザーパーティ
クルカウンター（リオンKA−14）で計測し（２）式から
求めた値である。The particle collection efficiency was measured by measuring the upstream and downstream sides of the filter medium and the concentration of Nacl particles when a 0.3 μm diameter Nacl particle particle was supplied to the test filter at a linear velocity of 5 cm / sec using a laser particle counter (Rion KA-14). ) Is obtained from equation (2).
ただし、 C1:試験用濾材の上流側における0.3μｍ直径のNacl粒
子濃度 C2:試験用濾材の下流側における0.3μｍの直径のNacl
粒子濃度 この1.5倍の単繊維捕集効率の増大は機械的な捕集効
率の寄与は小さく、そのほとんどが静電気的な捕集効率
の増大なのであり、つまり帯電量が従来法のエレクトレ
ット濾材に比べ大幅に増えたことを示唆している。 However, C 1: NaCl concentration of particles 0.3μm in diameter on the upstream side of the test filter medium C 2: NaCl of 0.3μm in diameter at the downstream side of the test filter medium
Particle concentration The increase of the single fiber collection efficiency by 1.5 times has little effect on the mechanical collection efficiency, and most of the increase is due to the increase of the electrostatic collection efficiency.In other words, the charge amount is smaller than that of the electret filter media of the conventional method. It suggests a significant increase.
本発明によるエレクトレット濾材の荷重量（粒子捕集
効率から求めた値。ncはナノクーロン（10-9クローン）
の意）は0.8nc/cm2で0.6nc/cm2以上、好ましくは1.0nc/
cm2以上である（従来法では0.3〜0.6nc/cm2以上の荷電
は付与できなかった）。Load of electret filter media according to the present invention (value obtained from particle collection efficiency. Nc is nanocoulomb (10 -9 clones)
Means 0.8 nc / cm 2 and 0.6 nc / cm 2 or more, preferably 1.0 nc / cm 2
cm 2 or more (a charge of 0.3 to 0.6 nc / cm 2 or more could not be applied by the conventional method).
本発明において、微粒子の付着したエレクトレット繊
維シートの貼り合せはエンボス熱溶着による貼り合せや
多孔質接着剤シートによる貼り合せが用いられる。エン
ボス熱溶着による貼り合せはエンボス熱溶着による貼り
合せはエンボスローラによる熱押圧方式、超音波溶着方
式や高周波溶着方式が用いられる。In the present invention, the electret fiber sheet to which the fine particles are adhered is bonded by emboss heat welding or bonded by a porous adhesive sheet. As the bonding by embossing heat welding, the bonding by embossing heat welding uses a heat pressing method using an embossing roller, an ultrasonic welding method, or a high-frequency welding method.
本発明の高性能エレクトレット濾材において、空気の
通る未溶着部と熱溶着によりフイルム化した溶着部の比
である溶着面積百分率は15％以下が好ましく、より好ま
しくは10％以下、更に好ましくは５％以下である。In the high-performance electret filter medium of the present invention, the weld area percentage, which is the ratio of the unwelded portion through which air passes and the welded portion formed by heat welding, is preferably 15% or less, more preferably 10% or less, and still more preferably 5%. It is as follows.
本発明において、エンボス熱溶着によるエンボス模様
はひとつの溶着部の面積が10mm2以下で丸状、点状、星
状、線状や矩型状などの形状の繰り返し模様で、本発明
の濾材の全体にわたって広がっている。In the present invention, the embossed pattern by the embossed heat welding is a repeated pattern of a round shape, a dot shape, a star shape, a linear shape, a rectangular shape, or the like with an area of one welded portion of 10 mm 2 or less, Spread throughout.
次に本発明を実施例でもって、具体的に示す。 Next, the present invention will be specifically described with reference to examples.
（実施例） 実施例１ 繊維径２μｍのポリプロピレンエレクトレットメルト
ブロー不織布（繊維量20g/m2）に蒸発凝縮で作製した１
μｍ直径のセバチン酸の微粒子を10cm/secで浸透させ、
1g/m2の付着量を不織布シートに付着させた。次いで、
コロナ針電極を用いて半導体シートを敷いたアース電極
面上にセバチン酸粒子を付着させたメルトブロー不織布
シートを置き、20kv/cmの高電圧を10秒間、印加してエ
レクトレット濾材とし、このエレクトレット濾材の２枚
をセバチン酸粒子の富に付着した面である浸透面同志で
重ね合せ、1mm2正方形の凸部の密度が200mm2あたり１個
のエンボスローラで熱押圧による貼り合せをして、高性
能エレクトレット濾材の作製した。(Example) Example 1 A polypropylene electret melt-blown nonwoven fabric having a fiber diameter of 2 μm (fiber amount 20 g / m 2 ) was prepared by evaporation and condensation.
Infiltrate microparticles of sebacic acid with a diameter of μm at 10 cm / sec,
An amount of 1 g / m 2 was attached to the nonwoven sheet. Then
A melt-blown nonwoven fabric sheet with sebacic acid particles attached is placed on the earth electrode surface on which the semiconductor sheet is spread using a corona needle electrode, and a high voltage of 20 kv / cm is applied for 10 seconds to form an electret filter medium. The two sheets are superposed on each other with the permeated surface, which is the surface that is rich in sebacic acid particles, and the density of the 1 mm 2 square protrusions is bonded by hot pressing with one emboss roller per 200 mm 2 for high performance. An electret filter medium was produced.
この高性能エレクトレット濾材を試験線速5cm/secで
0.3μｍのNacl粒子の捕集効率をレーザパーティクルカ
ウンター（リオンKC−14）で測定した。又、同時にこの
濾材の圧力損失をマノスターゲージにて測定した。This high-performance electret filter medium is tested at a test linear speed of 5 cm / sec.
The collection efficiency of 0.3 μm Nacl particles was measured with a laser particle counter (Rion KC-14). At the same time, the pressure loss of this filter medium was measured with a Manostar gauge.
比較例１ 実施例１のメルトブロー不織布を微粒子を付着処理せ
ずに実施例１と同じ荷電条件でエレクトレット化し次い
で、そのエレクトレット濾材の２枚を実施例１と同じ貼
り合せ、比較例１のエレクトレット濾材を作製し、粒子
捕集効率と圧力損失を測定した。Comparative Example 1 The melt-blown nonwoven fabric of Example 1 was electretized under the same charge conditions as in Example 1 without adhering fine particles, and then two of the electret filter media were bonded in the same manner as in Example 1 to obtain the electret filter media of Comparative Example 1. Was prepared, and the particle collection efficiency and pressure loss were measured.
表１に実施例１と比較例１の結果を示した。 Table 1 shows the results of Example 1 and Comparative Example 1.
実施例１の圧力損失は比較例１の1.2倍と微増した
が、単繊維捕集効率比η／η０は1.88と著しい増加を示
し、本発明における微粒子付着の効果が明らかであっ
た。Although the pressure loss of Example 1 was slightly increased to 1.2 times that of Comparative Example 1, the single fiber collection efficiency ratio η / η 0 was remarkably increased to 1.88, and the effect of adhesion of fine particles in the present invention was obvious.
比較例２ 実施例１の高性能エレクトレット濾材において、貼り
合せを実施例１とは逆のセバチン酸粒子の浸透面を外側
にして実施例１と同じ条件でエンボスローラで熱押圧に
よる貼り合せをして比較例２のエレクトレット濾材を作
製した。Comparative Example 2 In the high-performance electret filter medium of Example 1, the bonding was performed by hot pressing with an embossing roller under the same conditions as in Example 1 except that the permeated surface of the sebacic acid particles was opposite to that of Example 1. Thus, an electret filter medium of Comparative Example 2 was produced.
次いで、実施例１と比較例２についてそれぞれ一辺が
300mmの正方形で奥行き150mmのプリーツ型フィルターユ
ニット（濾過面積2.5m5）を作成した。これらフィルタ
ーユニットに大気塵濃度0.05g/m3の空気を毎分3m3で１
年間供給し、大気塵負荷後の捕集効率をレーザーパーテ
ィクルカウンター（リオンKC−14）で測定した。Next, one side of each of Example 1 and Comparative Example 2
A pleated filter unit (filtration area 2.5 m 5 ) having a square of 300 mm and a depth of 150 mm was prepared. The atmospheric air dust concentration 0.05 g / m 3 to these filter units per minute 3m 3 1
It was supplied annually and the collection efficiency after dust loading was measured with a laser particle counter (Rion KC-14).
表２には、大気塵負荷後のフィルターユニットの試験
風量3m3/分および同じ試験風量でフィルターユニットに
積極的にバイプレーターで加振を与えたときの捕集効率
を示している。3m3/分の試験風量では実施例１と比較例
２の捕集効率は大差ないが、これにバイブレータで加振
を与えながら、捕集効率を測定すると、比較例２のフィ
ルターユニットは捕集効率の著しい低下が認められた。
この原因はフィルターユニットの下流側に付着させたセ
バチン酸粒子の脱落や再飛散によるものと推測され、一
方実施例１の濾材のフィルターユニットではかかる問題
は発生しなかった。Table 2 shows the trapping efficiency when the filter unit was positively vibrated with a vibrator at a test air volume of 3 m 3 / min and the same test air volume after the air dust load. At a test air flow rate of 3 m 3 / min, the collection efficiency of Example 1 and Comparative Example 2 was not much different, but when the collection efficiency was measured while applying vibration with a vibrator, the filter unit of Comparative Example 2 showed that A significant decrease in efficiency was observed.
This was presumed to be due to the separation and re-dispersion of the sebacic acid particles attached to the downstream side of the filter unit. On the other hand, such a problem did not occur with the filter unit of the filter medium of Example 1.
実施例２ 繊維径1.5μｍのポリプロピレンエレクトレットメル
トブロー不織布シート（繊維量30g/m2）に蒸発凝縮で作
製した1.5μｍ直径のアビエチン酸の微粒子を10cm/sec
で浸透させ、1.5g/m2の付着量を不織布シートに付着さ
せた。次いで、該不織布シートの２枚を微粒子付着面を
貼り合せ面として、多孔質接着剤シート（ダイアポンド
株式会社、商品名メルトロンソフ）を用い、70℃で貼り
合せ加工し、実施例２の高性能エレクトレット濾材を作
製した。 Example 2 Fine particles of abietic acid having a diameter of 1.5 μm prepared by evaporative condensation on a polypropylene electret melt-blown nonwoven sheet (fiber amount: 30 g / m 2 ) having a fiber diameter of 1.5 μm were 10 cm / sec.
To adhere to the nonwoven fabric sheet in an amount of 1.5 g / m 2 . Next, the two nonwoven fabric sheets were bonded at 70 ° C. using a porous adhesive sheet (Diapond Co., Ltd., Meltronsof) with the fine particle-adhering surface as the bonding surface. An electret filter medium was produced.
比較例３ 実施例２のポリプロピレンメルトブロー不織布を微粒
子を付着させることなく、実施例１と同様の荷電条件で
エレクトレット化し、次いで、実施例２と同様に貼り合
せ加工し、比較例３のエレクトレット濾材を作製した。Comparative Example 3 The polypropylene melt-blown nonwoven fabric of Example 2 was electretized under the same charging conditions as in Example 1 without adhering fine particles, and then the laminate was processed in the same manner as in Example 2 to obtain an electret filter medium of Comparative Example 3. Produced.
表３に実施例２と比較例３の平板における粒子捕集効
率と圧力損失の測定結果を示した。Table 3 shows the measurement results of the particle collection efficiency and the pressure loss of the flat plates of Example 2 and Comparative Example 3.
実施例２の圧力損失は比較例３の1.2倍と微増した
が、単繊維捕集効率比η／η０は1.98と著しい増加を示
し、本発明における微粒子付着の効果は明らかであっ
た。 Although the pressure loss of Example 2 was slightly increased to 1.2 times that of Comparative Example 3, the single fiber collection efficiency ratio η / η 0 was remarkably increased to 1.98, and the effect of adhesion of fine particles in the present invention was clear.
（発明の効果） 本発明によると圧力損失は僅かに上昇するものの、大
幅に捕集効率が増加するエレクトレット濾材を提供する
ことができる。(Effects of the Invention) According to the present invention, it is possible to provide an electret filter medium in which the collection efficiency is significantly increased although the pressure loss is slightly increased.
Claims (1)
トと微粒子から成るエレクトレット濾材において、該微
粒子を該繊維シートの一方の面に富に付着させ、該繊維
シートの２枚を該微粒子を富に付着させた面同志で貼り
合せたことを特徴とする高性能エレクトレット濾材。1. An electret filter medium in which a charge retention structure comprises an electret fiber sheet and fine particles, wherein said fine particles are richly attached to one surface of said fiber sheet, and two of said fiber sheets are richly attached to said fine particles. A high-performance electret filter medium characterized in that it is bonded together with the same surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20106189A JP2936591B2 (en) | 1989-08-01 | 1989-08-01 | High-performance electret filter media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20106189A JP2936591B2 (en) | 1989-08-01 | 1989-08-01 | High-performance electret filter media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0365206A JPH0365206A (en) | 1991-03-20 |
| JP2936591B2 true JP2936591B2 (en) | 1999-08-23 |
Family
ID=16434734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20106189A Expired - Fee Related JP2936591B2 (en) | 1989-08-01 | 1989-08-01 | High-performance electret filter media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2936591B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3253847B2 (en) * | 1995-02-21 | 2002-02-04 | 日本バイリーン株式会社 | Method and apparatus for manufacturing electret body |
| ITPS20040007A1 (en) * | 2004-02-18 | 2004-05-18 | Cl Com Advanced Tecnology Srl | PROTECTION MASK AGAINST BIOLOGICAL AGENTS |
| US7922959B2 (en) * | 2008-08-01 | 2011-04-12 | E. I. Du Pont De Nemours And Company | Method of manufacturing a composite filter media |
| JP2014226628A (en) * | 2013-05-24 | 2014-12-08 | 東洋紡株式会社 | Electret filter |
| CN116949682B (en) * | 2023-06-03 | 2024-01-26 | 广东爱航环境科技有限公司 | Non-woven fabric for deodorizing and antibacterial air purifier and preparation method thereof |
-
1989
- 1989-08-01 JP JP20106189A patent/JP2936591B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0365206A (en) | 1991-03-20 |
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