JP2019013888A - Filter material for gas removal filters - Google Patents
Filter material for gas removal filters Download PDFInfo
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- JP2019013888A JP2019013888A JP2017133647A JP2017133647A JP2019013888A JP 2019013888 A JP2019013888 A JP 2019013888A JP 2017133647 A JP2017133647 A JP 2017133647A JP 2017133647 A JP2017133647 A JP 2017133647A JP 2019013888 A JP2019013888 A JP 2019013888A
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- exchange resin
- ion exchange
- gas removal
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- removal filter
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- 239000000463 material Substances 0.000 title claims abstract description 20
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 73
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 73
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000012943 hotmelt Substances 0.000 claims description 18
- 239000003957 anion exchange resin Substances 0.000 claims description 14
- 239000003729 cation exchange resin Substances 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 13
- 239000004745 nonwoven fabric Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 description 17
- 239000011347 resin Substances 0.000 description 17
- 239000002585 base Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000005349 anion exchange Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920006230 thermoplastic polyester resin Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 101100256177 Stachybotrys chartarum (strain CBS 109288 / IBT 7711) SAT10 gene Proteins 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- -1 anion ions Chemical class 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 229940023913 cation exchange resins Drugs 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002397 thermoplastic olefin Polymers 0.000 description 1
- 229920006345 thermoplastic polyamide Polymers 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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Abstract
Description
本発明は、例えば、半導体製造工場や精密電子製造工場のクリーンルーム、クリーンルーム内で使用される装置（デバイス）、もしくは、医療用等に用いられるクリーンベンチに使用されるケミカル用のガス除去フィルタまたは博物館の絵画等の変質を防止する目的で使用されるガス除去フィルタ等に用いられるガス除去フィルタ用ろ材に関するものである。 The present invention relates to a gas removal filter for chemicals or a museum used for a clean bench used for a clean room used in a clean room, a medical room, etc., for example, in a clean room of a semiconductor manufacturing factory or a precision electronic manufacturing factory. The present invention relates to a filter material for a gas removal filter used for a gas removal filter or the like used for the purpose of preventing alteration of a painting or the like.
従来、この種のガス除去フィルタ用ろ材としては、例えば特開平２００５−１０３４０３号公報に開示されるようにカチオン交換樹脂やアニオン交換樹脂のようなイオン交換樹脂からなるイオン交換樹脂層を不織布などの通気性基材で挟持したガス除去フィルタ用ろ材が知られている。 Conventionally, as this type of filter medium for gas removal filter, an ion exchange resin layer made of an ion exchange resin such as a cation exchange resin or an anion exchange resin as disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-103403 is used. There is known a filter medium for a gas removal filter sandwiched between air-permeable substrates.
このようなイオン交換樹脂からなるイオン交換樹脂層を不織布などの通気性基材で挟持したガス除去フィルタ用ろ材はガス除去性能については優れているものの、イオン交換樹脂の寿命が短く、その結果、ガス除去フィルタの寿命も短くなるため、ろ材の交換を頻繁に行わなければならないというメンテナンス上の不都合があった。更にまた、高価なイオン交換樹脂を用いるため経済的な側面からもガス除去フィルタ用ろ材の長寿命化が望まれていた。
そこで、本発明は長寿命化された、イオン交換樹脂からなるイオン交換樹脂層を通気性基材で挟持したガス除去フィルタ用ろ材を提供することを目的とする。
Although the filter medium for a gas removal filter in which an ion exchange resin layer made of such an ion exchange resin is sandwiched between breathable substrates such as nonwoven fabrics is excellent in gas removal performance, the life of the ion exchange resin is short, and as a result, Since the life of the gas removal filter is shortened, there is a problem in maintenance that the filter medium must be frequently replaced. Furthermore, since an expensive ion exchange resin is used, it has been desired to extend the life of the filter medium for gas removal filter from the economical aspect.
Accordingly, an object of the present invention is to provide a filter medium for a gas removal filter that has an ion exchange resin layer made of an ion exchange resin and that is sandwiched between air-permeable substrates.
本発明者等はかかる課題を解決するべく鋭意検討の結果、活性炭をイオン交換樹脂の充填間隙内に混在させることによって、イオン交換樹脂の寿命が延びることを知見した As a result of intensive studies to solve such problems, the present inventors have found that the life of the ion exchange resin is extended by mixing activated carbon in the filling gap of the ion exchange resin.
本発明のガス除去フィルタ用ろ材はかかる知見に基づきなされたもので、請求項１記載の通り、イオン交換樹脂からなるイオン交換樹脂層を通気性基材で挟持したガス除去フィルタ用ろ材であって、前記イオン交換樹脂の充填間隙内に活性炭を混在させたことを特徴とする。
また、請求項２記載のガス除去フィルタ用ろ材は、請求項１記載のガス除去フィルタ用ろ材において、前記イオン交換樹脂層の片面側または両面側において前記イオン交換樹脂の充填間隙内に活性炭を混在させたことを特徴とする。
また、請求項３記載のガス除去フィルタ用ろ材は、請求項１または２の何れかに記載のガス除去フィルタ用ろ材において、前記イオン交換樹脂として少なくともカチオン交換樹脂が含まれることを特徴とする。
また、請求項４記載のガス除去フィルタ用ろ材は、請求項３記載のガス除去フィルタ用ろ材において、前記イオン交換樹脂としてアニオン交換樹脂が含まれることを特徴とする。
また、請求項５記載のガス除去フィルタ用ろ材は、請求項１乃至４の何れか１項に記載のガス除去フィルタ用ろ材において、前記イオン交換樹脂の有効径が４００μｍ以上で、前記活性炭の有効径は２５０〜３５０μｍであることを特徴とする。
また、請求項６記載のガス除去フィルタ用ろ材は、請求項１乃至５の何れか１項に記載のガス除去フィルタ用ろ材において、前記通気性基材は不織布であることを特徴とする。
また、請求項７記載のガス除去フィルタ用ろ材は、請求項６に記載のガス除去フィルタ用ろ材において、前記不織布の一方が起毛された不織布であることを特徴とする。
また、請求項８記載のガス除去フィルタ用ろ材は、請求項１乃至７の何れか１項に記載のガス除去フィルタ用ろ材において、前記イオン交換樹脂及び活性炭はホットメルトパウダーで固着されていることを特徴とする。
また、請求項９記載のガス除去フィルタ用ろ材は、請求項１乃至８の何れか１項に記載のガス除去フィルタ用ろ材において、前記ろ材の圧力損失の変動係数が３０％以下であることを特徴とする。
The filter medium for a gas removal filter of the present invention is based on such knowledge, and as described in
The filter medium for a gas removal filter according to
A gas removal filter medium according to claim 3 is characterized in that, in the gas removal filter medium according to
According to a fourth aspect of the present invention, in the gas removal filter medium according to the third aspect, an anion exchange resin is included as the ion exchange resin.
The filter medium for a gas removal filter according to claim 5 is the filter medium for a gas removal filter according to any one of
The gas removal filter medium according to claim 6 is the gas removal filter medium according to any one of
A gas removal filter medium according to claim 7 is the gas removal filter medium according to claim 6, wherein one of the nonwoven fabrics is raised.
The filter medium for gas removal filter according to claim 8 is the filter medium for gas removal filter according to any one of
The filter medium for a gas removal filter according to claim 9 is the filter medium for a gas removal filter according to any one of
本発明のガス除去フィルタ用ろ材は、イオン交換樹脂からなるイオン交換樹脂層を通気性基材で挟持したガス除去フィルタ用ろ材であって、前記イオン交換樹脂の充填間隙内に活性炭を混在させることにより、イオン交換樹脂間の隙間にそれより粒径の小さな活性炭が充填されるため、イオン交換樹脂層の寿命が長寿命化し、かつろ材の薄型化により、フィルタへのろ材の投入量が多くなり、さらに長寿命化する。そのため、ガス除去フィルタ用ろ材と、ガス除去フィルタの寿命も長寿命化し、ガス除去フィルタのメンテナンスも容易となり、また、経済的なメリットも大きい。
更にまた、前記イオン交換樹脂層の片面側または両面側において前記イオン交換樹脂の充填間隙内に活性炭を混在するようにした場合、前記イオン交換樹脂層ではイオン交換樹脂がその充填間隙内に活性炭が混在された状態の平滑面において通気性シートに接触するため、イオン交換樹脂層と通気性シートとの間には平滑な界面が形成されることになり、通気性シートをプリーツ加工した際に通気性基材に破れなどが生じにくくなる。
尚、イオン交換樹脂と活性炭を混在させた際には偏在が起こり、圧力損失の変動係数が大きくなる傾向があるが、イオン交換樹脂と活性炭の偏在を調整することにより、圧力損失変動係数を３０％以下にした場合、ろ材の破れ、剥離が生じないため、ろ材の破れ、剥離によって生じるイオン交換樹脂及び活性炭のろ材からの脱落を防止できる。
The filter medium for a gas removal filter of the present invention is a filter medium for a gas removal filter in which an ion exchange resin layer made of an ion exchange resin is sandwiched between breathable base materials, wherein activated carbon is mixed in the filling gap of the ion exchange resin. As a result, activated carbon with a smaller particle size is filled in the gaps between the ion exchange resins, thereby extending the life of the ion exchange resin layer and reducing the thickness of the filter media, thereby increasing the amount of filter media input to the filter. Further, the service life is extended. For this reason, the filter media for the gas removal filter and the gas removal filter have a long service life, the maintenance of the gas removal filter is facilitated, and the economic merit is great.
Furthermore, when activated carbon is mixed in the filling gap of the ion exchange resin on one side or both sides of the ion exchange resin layer, the ion exchange resin in the ion exchange resin layer has activated carbon in the filling gap. Since the air-permeable sheet comes into contact with the smooth surface in a mixed state, a smooth interface is formed between the ion-exchange resin layer and the air-permeable sheet. It is difficult to cause tearing or the like on the conductive substrate.
In addition, when ion exchange resin and activated carbon are mixed, uneven distribution occurs and the variation coefficient of pressure loss tends to increase. However, by adjusting the uneven distribution of ion exchange resin and activated carbon, the variation coefficient of pressure loss is 30. When the ratio is less than or equal to%, the filter medium is not torn or peeled off, so that the filter medium can be prevented from being broken or peeled off from the ion exchange resin and activated carbon.
図１は本発明のガス除去フィルタ用ろ材の一実施例を示すもので、酸性ガス除去用に構成したもので、図中１は不織布からなる通気性基材を示し、その内面をＣＤ（Cross Direction）方向に均一に起毛させて全一面に起毛１ａが設けられ、この起毛１ａ面に対してイオン交換樹脂層１０を構成するカチオン交換樹脂とアニオン交換樹脂とからなるイオン交換樹脂Ａが図略のホットメルトパウダーと共に散布されてイオン交換樹脂層１０を構成し、その上に有効径２５０〜３００μｍの粒状活性炭ａが図略のホットメルトパウダーと共に散布される。更にその上面に図略のホットメルトパウダーが散布され、その上面に不織布からなる通気性基材２が被覆されている。本実施例では、このように構成したため、通気性基材２の近傍における前記イオン交換樹脂Ａの充填間隙内に活性炭ａが混在された状態になり、その下側は活性炭ａを含まないイオン交換樹脂Ａのみのイオン交換樹脂層１０に構成されている。
FIG. 1 shows an embodiment of a filter medium for gas removal filter according to the present invention, which is configured to remove acidic gas. In the figure, 1 shows a breathable base material made of nonwoven fabric, and its inner surface is CD (Cross The ion-exchange resin A which consists of the cation exchange resin and the anion exchange resin which comprise the ion-
図１の例では、通気性基材２の近傍においてのみイオン交換樹脂Ａの充填間隙に活性炭ａを混在させるようにしたが、図２に示すように予めイオン交換樹脂Ａと活性炭をａを均一に混ぜておくことで、イオン交換樹脂Ａの充填間隙に活性炭ａを混在させるようにしてもよい。
尚、図１のように通気性基材２の近傍で活性炭ａをイオン交換樹脂Ａの充填間隙に混在させる場合、活性炭ａはガス除去フィルタの上流側で混在するようにしても下流側で混在するようにしても、或いは、両側において混在するようにしても構わない。
図示のものでは、酸性ガス除去用として、イオン交換樹脂層１０をカチオン交換樹脂とアニオン交換樹脂とで構成したが、例えば、アルカリガス除去用として構成する場合はカチオン交換樹脂のみで構成してもよい。
In the example of FIG. 1, activated carbon a is mixed in the filling gap of the ion exchange resin A only in the vicinity of the
In addition, when the activated carbon a is mixed in the filling gap of the ion exchange resin A in the vicinity of the
In the illustrated example, the ion
本発明において使用されるアニオン交換樹脂としては、公知のイオン交換可能なアニオン交換基（−ＮＨ２、−Ｎ＋Ｒ３基、但し、Ｒはアルキル基）を持つアニオン交換樹脂を用いることができる。湿潤状態のアニオン交換基樹脂のみならず、イオン交換基が脱離していない乾燥状態のアニオン交換樹脂、または、カチオン交換基（−ＣＯＯＨ、−ＳＯ３Ｈ等）を持つ湿潤状態のカチオン交換樹脂もしくは乾燥状態のカチオン交換樹脂のいずれか１種または複数種選択して使用することができる。アニオン交換樹脂とカチオン交換樹脂を併用して使用した場合、ガス中のカチオン・アニオンイオンを同時に処理することができ、有用だからである。
また、湿潤アニオン交換樹脂、乾燥アニオン交換樹脂、湿潤カチオン交換樹脂、乾燥カチオン交換樹脂を適宜選択して併用して使用することによって、ガス除去フィルタ用ろ材に含まれる湿潤アニオン交換樹脂の水分率を調製することができる。
As the anion exchange resin used in the present invention, anion exchange resins having a known ion exchangeable anion exchange group (—NH 2 , —N + R 3 group, where R is an alkyl group) can be used. Not only a wet anion exchange group resin, but also a dry anion exchange resin from which ion exchange groups are not eliminated, or a wet cation exchange resin having a cation exchange group (-COOH, -SO 3 H, etc.) or Any one or a plurality of dry cation exchange resins can be selected and used. This is because when an anion exchange resin and a cation exchange resin are used in combination, cations and anion ions in the gas can be treated at the same time, which is useful.
In addition, the wet anion exchange resin, the dry anion exchange resin, the wet cation exchange resin, and the dry cation exchange resin are appropriately selected and used in combination, whereby the moisture content of the wet anion exchange resin contained in the filter medium for gas removal filter can be reduced. Can be prepared.
また、本発明のガス除去フィルタ用ろ材は、イオン交換樹脂を通気性基材にホットメルト樹脂を介在させて固着することが好ましい。ホットメルト樹脂は、発ガスの原因となる低分子量の揮発性有機物の含有量が少なく、ガス除去フィルタ用ろ材全体の発ガス量を少なくすることができるからである。また、パウダー状のホットメルト樹脂を介在させて固着することがより好ましい。ホットメルト樹脂がパウダー状であると、通気性基材上に散布したイオン交換樹脂とイオン交換樹脂との間にパウダー状のホットメルト樹脂が部分的に介在し、通気性基材とイオン交換樹脂を平面的に固着するのみならず、イオン交換樹脂とイオン交換樹脂の表面に部分的に介在したパウダー状のホットメルト樹脂が３次元的にイオン交換樹脂を固着するため、イオン除去効率を低減することなく、大量のイオン交換樹脂を強固に通気性基材に固着することができる。
前記ホットメルト樹脂としては、例えば、熱可塑性ポリエチレン樹脂、熱可塑性ナイロン樹脂、熱可塑性ポリアミド系樹脂、熱可塑性ポリエステル樹脂、熱可塑性ポリウレタン樹脂、熱可塑性ポリオレフィン樹脂、エチレン−酢酸ビニル共重合体、エチレン−酢酸ビニル共重合体の鹸化物、アクリル酸共重合体、エチレン−エチルアクリレート共重合体、エチレン−アクリル共重合体、アイオノマー樹脂（エチレン−メタクリル酸共重合体に金属を付与した感熱性樹脂）等のポリオレフィン変性樹脂、およびこれら２種類以上の複合物等のホットメルト樹脂が挙げられる。特に発ガス量抑制のため熱可塑性ポリエステル樹脂のホットメルト樹脂が好ましい。
In the filter medium for a gas removal filter of the present invention, it is preferable that the ion exchange resin is fixed to a breathable base material with a hot melt resin interposed. This is because the hot-melt resin has a low content of low-molecular-weight volatile organic substances that cause gas generation, and the gas generation amount of the entire filter medium for gas removal filter can be reduced. Moreover, it is more preferable to fix by interposing a powdery hot melt resin. If the hot melt resin is powdery, the powdery hot melt resin is partially interposed between the ion exchange resin and the ion exchange resin sprayed on the breathable base material, and the breathable base material and the ion exchange resin. The ion-exchange resin and the powdery hot melt resin partially interposed on the surface of the ion-exchange resin three-dimensionally fix the ion-exchange resin, thereby reducing the ion removal efficiency. Without this, a large amount of ion exchange resin can be firmly fixed to the breathable substrate.
Examples of the hot melt resin include thermoplastic polyethylene resin, thermoplastic nylon resin, thermoplastic polyamide resin, thermoplastic polyester resin, thermoplastic polyurethane resin, thermoplastic polyolefin resin, ethylene-vinyl acetate copolymer, ethylene- Saponified products of vinyl acetate copolymer, acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic copolymer, ionomer resin (thermosensitive resin in which metal is added to ethylene-methacrylic acid copolymer), etc. And a hot melt resin such as a composite of two or more of them. In particular, a hot-melt resin of a thermoplastic polyester resin is preferable for suppressing the amount of gas generated.
本発明に用いられる通気性基材としては、熱可塑性樹脂等の合成繊維からなる不織布が好ましく、例えば、乾式法、湿式法、スパンレース法、スパンボンド法、メルトブロー法等の方法により製造されるものが好ましい。また、前記通気性基材が起毛を施したものであってもよい。なお、通気性基材に起毛が施されていると、起毛によって前記イオン交換樹脂散布時の分散性が向上し、また、イオン交換樹脂と通気性基材の固着強度が増し、イオン交換樹脂が空間的に接着され、除去対象となるガスとの接触がよくなるため、前記イオン交換樹脂の利用効率が向上する。起毛方法は、特に制限されないが、表面を引っ掻くための無数の針、あるいは、ブラシが周囲に植立されたドラム間を通過させて、通気性基材を起毛することができる。 The breathable substrate used in the present invention is preferably a nonwoven fabric made of synthetic fibers such as a thermoplastic resin, and is manufactured by a method such as a dry method, a wet method, a spunlace method, a spunbond method, or a melt blow method. Those are preferred. Further, the breathable base material may be raised. In addition, when the air-permeable base material is brushed, the dispersibility when the ion-exchange resin is dispersed is improved by the brushing, and the fixing strength between the ion-exchange resin and the air-permeable base material is increased. Since it is spatially bonded and the contact with the gas to be removed is improved, the utilization efficiency of the ion exchange resin is improved. The raising method is not particularly limited, but the air-permeable substrate can be raised by passing through an infinite number of needles for scratching the surface or a drum having a brush planted around it.
以下に本発明の実施例を比較例及び従来例とともに説明するが、本発明は以下の実施例に限定されるものではない。 Examples of the present invention will be described below together with comparative examples and conventional examples, but the present invention is not limited to the following examples.
（実施例１）
通気性基材として不織布（ユニチカ製 ＷＳＯ）、加熱により溶融軟化する樹脂粉末（ホットメルトパウダー）としてポリエステル樹脂粉末（東京インキ製 ＰＲＧ１００Ｋ 平均粒子径５００μｍ）、活性炭として株式会社クラレＧＧ３２／６０（粒度２５０〜５００μｍ、９７．４％、平均粒子径３８０μｍ）、イオン交換樹脂としてアニオン交換樹脂（三菱化学製 ＳＡＴ１０ 平均粒子径７２０μｍ）と、カチオン交換樹脂（三菱化学製 ＳＫＴ１０ 平均粒子径７２０μｍ）を用いた。
Example 1
Nonwoven fabric (WSO manufactured by Unitika) as a breathable base material, polyester resin powder (Tokyo ink PRG100K average particle size 500 μm) as a resin powder (hot melt powder) that melts and softens by heating, and Kuraray GG32 / 60 Co., Ltd. (particle size 250) as activated carbon ˜500 μm, 97.4%, average particle size 380 μm), anion exchange resin (SAT10 average particle size 720 μm manufactured by Mitsubishi Chemical) and cation exchange resin (SKT10 average particle size 720 μm manufactured by Mitsubishi Chemical) were used as the ion exchange resin.
まず、前記通気性基材の表面を均一に起毛させる。次に、前記アニオン交換樹脂（目付３００ｇ／ｍ２）と、カチオン交換樹脂（目付７５ｇ／ｍ２）とホットメルトパウダーを混合したものを散布する。次に、前記粒状活性炭（目付３００ｇ／ｍ２）とホットメルトパウダーを混合したものを散布し、その上にホットメルトパウダーを均一に散布し、前記と同じ、但し起毛しない不織布を貼り合せて、熱固着させ、ガス除去フィルタ用ろ材を作成した。 First, the surface of the breathable substrate is uniformly raised. Next, a mixture of the anion exchange resin (weight per unit area 300 g / m 2 ), cation exchange resin (weight per unit area 75 g / m 2 ) and hot melt powder is sprayed. Next, a mixture of the granular activated carbon (weight per unit area 300 g / m 2 ) and hot melt powder is dispersed, the hot melt powder is uniformly dispersed thereon, and the same nonwoven fabric as that described above, but without raising, is bonded, A filter medium for a gas removal filter was prepared by heat fixing.
(実施例２)
実施例１と同じ量のイオン交換樹脂と活性炭を混合器で１０分間均一に混合したものを用いて前記通気性基材間に配置するようにした以外は前記実施例１と同様にしてガス除去フィルタ用ろ材を作成した。
(Example 2)
Degassing in the same manner as in Example 1 except that the same amount of ion exchange resin and activated carbon as in Example 1 were mixed uniformly in a mixer for 10 minutes and placed between the breathable substrates. A filter medium was prepared.
(比較例)
イオン交換樹脂と活性炭を混合器で３分間混合した以外は前記実施例２と同様にしてガス除去フィルタ用ろ材を作成した。
(Comparative example)
A gas removal filter medium was prepared in the same manner as in Example 2 except that the ion exchange resin and activated carbon were mixed for 3 minutes in a mixer.
(従来例)
前記活性炭を含ませないようにしたこと以外は前記実施例１と同様にしてガス除去フィルタ用ろ材を作成した。
(Conventional example)
A gas removal filter medium was prepared in the same manner as in Example 1 except that the activated carbon was not included.
次ぎに、前記各ガス除去フィルタ用ろ材の以下の特性について、以下のようにして評価した。 Next, the following characteristics of the filter media for each gas removal filter were evaluated as follows.
＜二酸化硫黄ガスの寿命比率＞
ガス除去フィルタ用ろ材の試験サンプルをホルダに装着し、対象ガスとして、２０〜４０ｐｐｍの濃度の二酸化硫黄ガスを５．２ｍ／秒で通風させた。試験サンプルとしては、縦３０ｍｍ×横３０ｍｍのサイズのものをろ材ロールのＭＤ(Machine Direction)、 ＣＤ（Cross Direction）方向で同列でない場所から３枚切り出して用いた。試験サンプルの上流側と下流側で検知管を用いて対象ガスの濃度を測定し下記式で除去効率を算出した。
（除去効率）＝1―(下流側濃度)/(上流側濃度)×１００
上記条件で対象ガスを流し続け、経過時間ごとに除去効率を算出し、その除去効率が８５％になった時点の時間をとり、各々３枚のろ材の平均をとったものを寿命時間とした。寿命比率は従来例のろ材を１とし、それぞれのろ材の寿命の比率を表した。
<Life ratio of sulfur dioxide gas>
A test sample of a filter medium for a gas removal filter was mounted on a holder, and sulfur dioxide gas having a concentration of 20 to 40 ppm was ventilated as a target gas at 5.2 m / second. As a test sample, a sample having a size of 30 mm in length and 30 mm in width was cut out from a place not in the same line in the MD (Machine Direction) and CD (Cross Direction) directions of the filter media roll. The concentration of the target gas was measured using the detection tube on the upstream side and the downstream side of the test sample, and the removal efficiency was calculated by the following equation.
(Removal efficiency) = 1-(Downstream concentration) / (Upstream concentration) x 100
The target gas is kept flowing under the above conditions, the removal efficiency is calculated for each elapsed time, the time when the removal efficiency becomes 85% is taken, and the average of the three filter media is taken as the lifetime. . The life ratio was set to 1 for the conventional filter medium, and the life ratio of each filter medium was expressed.
＜圧力損失の変動係数＞
圧力損失の変動係数はろ材のロールからＭＤ(Machine Direction)方向３枚、ＣＤ（Cross Direction）方向４枚、ろ材寸法２００×１３５mmでサンプリングをし、１２枚のろ材の圧力損失を測定し、その平均値と標準偏差をとり、平均値を標準偏差で割ったものに１００かけたものを変動係数とする。
<Coefficient of variation of pressure loss>
The coefficient of variation of pressure loss is sampled from the filter medium roll with 3 sheets in the MD (Machine Direction) direction, 4 sheets in the CD (Cross Direction) direction, and the filter medium size of 200 x 135 mm, and the pressure loss of 12 filter media is measured. The average value and standard deviation are taken, and the average value divided by the standard deviation multiplied by 100 is taken as the coefficient of variation.
＜破れ、剥離＞
上記ガス除去フィルタ用ろ材をプリーツ加工し、通気性基材の破れ、剥離を目視で確認する。〇は破れ、剥離がほとんどなし、△は破れ、剥離が少ない、×は破れ、剥離が多いことを意味する。
<Tear and peel>
The filter medium for gas removal filter is pleated, and the breathable base material is checked for tearing and peeling. ○ means tearing and almost no peeling, Δ means tearing and little peeling, × means breaking and many peeling.
前記表１から明らかなように、本発明の実施例１及び２のろ材は比較例のろ材に比較して長寿命で、また、加工時におけるろ材の破れや剥離が生じないことが確認できた。また、実施例２に比べ実施例１の方がより長寿命となることも確認できた。更に、同じイオン交換樹脂量と活性炭量を用いた場合の圧力損失の変動係数の調整によりろ材のＭＤ(Machine Direction)、 ＣＤ（Cross Direction）方向の場所による寿命の変動をコントロールできることも明らかになった。 As apparent from Table 1, it was confirmed that the filter media of Examples 1 and 2 of the present invention had a longer life than the filter media of the comparative examples, and the filter media were not torn or peeled during processing. . It was also confirmed that the life of Example 1 was longer than that of Example 2. Furthermore, it is also clear that the fluctuation of the life depending on the location of MD (Machine Direction) and CD (Cross Direction) of the filter medium can be controlled by adjusting the coefficient of variation of pressure loss when the same ion exchange resin amount and activated carbon amount are used. It was.
１ 通気性基材
１ａ起毛
２ 通気性基材
１０ イオン交換樹脂層
Ａ イオン交換樹脂
ａ 活性炭
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000350913A (en) * | 1999-06-10 | 2000-12-19 | Nitta Ind Corp | Gas removing filter and its manufacture |
| JP2004181368A (en) * | 2002-12-03 | 2004-07-02 | Nippon Muki Co Ltd | Filter medium for gas removal filter, and gas removal filter |
| JP2005103403A (en) * | 2003-09-29 | 2005-04-21 | Nippon Muki Co Ltd | Filter medium for gas removing filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000350913A (en) * | 1999-06-10 | 2000-12-19 | Nitta Ind Corp | Gas removing filter and its manufacture |
| JP2004181368A (en) * | 2002-12-03 | 2004-07-02 | Nippon Muki Co Ltd | Filter medium for gas removal filter, and gas removal filter |
| JP2005103403A (en) * | 2003-09-29 | 2005-04-21 | Nippon Muki Co Ltd | Filter medium for gas removing filter |
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