JP3554594B2 - Acid resistant filter - Google Patents
Acid resistant filter Download PDFInfo
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- JP3554594B2 JP3554594B2 JP00964895A JP964895A JP3554594B2 JP 3554594 B2 JP3554594 B2 JP 3554594B2 JP 00964895 A JP00964895 A JP 00964895A JP 964895 A JP964895 A JP 964895A JP 3554594 B2 JP3554594 B2 JP 3554594B2
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- filter
- acid
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- 239000002253 acid Substances 0.000 title claims description 20
- 150000001875 compounds Chemical class 0.000 claims description 15
- 229920005989 resin Polymers 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
- 239000005056 polyisocyanate Substances 0.000 claims description 12
- 229920001228 polyisocyanate Polymers 0.000 claims description 12
- 229920006231 aramid fiber Polymers 0.000 claims description 9
- 239000004760 aramid Substances 0.000 claims description 7
- 239000010419 fine particle Substances 0.000 claims description 7
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 229920003986 novolac Polymers 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 9
- 239000004744 fabric Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 5
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 229930003836 cresol Natural products 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- -1 polymetaphenylene isophthalamide Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 239000012210 heat-resistant fiber Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RMVRSNDYEFQCLF-UHFFFAOYSA-N thiophenol Chemical compound SC1=CC=CC=C1 RMVRSNDYEFQCLF-UHFFFAOYSA-N 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 2
- PYVHTIWHNXTVPF-UHFFFAOYSA-N F.F.F.F.C=C Chemical compound F.F.F.F.C=C PYVHTIWHNXTVPF-UHFFFAOYSA-N 0.000 description 2
- 229920000538 Poly[(phenyl isocyanate)-co-formaldehyde] Polymers 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 239000002981 blocking agent Substances 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 150000002923 oximes Chemical class 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 description 1
- CDULGHZNHURECF-UHFFFAOYSA-N 2,3-dimethylaniline 2,4-dimethylaniline 2,5-dimethylaniline 2,6-dimethylaniline 3,4-dimethylaniline 3,5-dimethylaniline Chemical group CC1=CC=C(N)C(C)=C1.CC1=CC=C(C)C(N)=C1.CC1=CC(C)=CC(N)=C1.CC1=CC=C(N)C=C1C.CC1=CC=CC(N)=C1C.CC1=CC=CC(C)=C1N CDULGHZNHURECF-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- QORUGOXNWQUALA-UHFFFAOYSA-N N=C=O.N=C=O.N=C=O.C1=CC=C(C(C2=CC=CC=C2)C2=CC=CC=C2)C=C1 Chemical compound N=C=O.N=C=O.N=C=O.C1=CC=C(C(C2=CC=CC=C2)C2=CC=CC=C2)C=C1 QORUGOXNWQUALA-UHFFFAOYSA-N 0.000 description 1
- 239000004693 Polybenzimidazole Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- PXAJQJMDEXJWFB-UHFFFAOYSA-N acetone oxime Chemical compound CC(C)=NO PXAJQJMDEXJWFB-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000004984 aromatic diamines Chemical class 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- FDQSRULYDNDXQB-UHFFFAOYSA-N benzene-1,3-dicarbonyl chloride Chemical compound ClC(=O)C1=CC=CC(C(Cl)=O)=C1 FDQSRULYDNDXQB-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- JXCHMDATRWUOAP-UHFFFAOYSA-N diisocyanatomethylbenzene Chemical compound O=C=NC(N=C=O)C1=CC=CC=C1 JXCHMDATRWUOAP-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 150000003951 lactams Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- NAYYNDKKHOIIOD-UHFFFAOYSA-N phthalamide Chemical class NC(=O)C1=CC=CC=C1C(N)=O NAYYNDKKHOIIOD-UHFFFAOYSA-N 0.000 description 1
- XUWHAWMETYGRKB-UHFFFAOYSA-N piperidin-2-one Chemical compound O=C1CCCCN1 XUWHAWMETYGRKB-UHFFFAOYSA-N 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920006376 polybenzimidazole fiber Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Filtering Materials (AREA)
Description
【０００１】
【産業上の利用分野】
本発明の耐酸性フィルターは、都市ゴミ焼却炉の排ガス、工場排気ガス等の排ガス中の微粒子を捕集するバッグフィルター等に利用される。
【０００２】
【従来の技術】
現在、集塵用フィルターとして種々のフィルターが知られている。特に、耐熱性フィルターとしては、例えば「炭素繊維を主としたウエッブをフィルタークロス使用時の表側にあたる層に配し、他の層には、有機耐熱性繊維からなるウエッブを配して、耐スパッタリング性を持たせた集塵用ニードルフィルタークロス。」（実開昭５９−１６２９１３号公報）などが知られている。一般に集塵用フィルター用繊維として、よく利用されているのは金属繊維、ガラス繊維等であるが、特にメタ型アラミド繊維がよく利用されている。
【０００３】
メタ型アラミド繊維は，耐熱性に優れ、それを活かし、高温状態に暴露される分野で広く使用されている。都市ゴミ焼却炉などの排ガス中の微粒子などを捕集するバッグフィルターの素材として広く使用されている。しかしながら、排ガス中には硫酸ミスト、塩酸ミストなどが含有されており、長期間高温状態で運転されるため、濾過布が劣化し、途中でバッグが破損するなどのトラブルが発生することがある。それを防止するために、濾過布をＮ−メチロール系樹脂で被覆する（特公昭５１−３４５８６号公報）ことや、濾過布をアルミナなどの無機微粒子及びフッ素系樹脂で被覆加工することが提案されているが（特公平４−６０６８５号公報）、運転条件によっては、万全ではない。そこで、発明者らは、鋭意検討した結果、本発明に至ったものである。
【０００４】
【発明の目的】
本発明は以上の事情を背景としてなされたものである。本発明の目的は、より過酷な酸性雰囲気中においても、フィルターを構成する繊維の特性を損なうことなく、フィルターとしての特性を発揮できる耐酸性フィルターを提供することにある。
【０００５】
【発明の構成】
すなわち本発明は「（請求項１） スクリムにフェルトが一体成型されてなるフィルターにおいて、スクリムが、予めフッ素系樹脂にブロックドポリイソシアネート化合物及びフェノールノボラック化合物を配合した加工剤を付与されたスクリムであることを特徴とする耐酸性フィルター。
（請求項２） フィルターが、更に、無機微粒子を含有するフッ素系樹脂で処理された請求項１記載の耐酸性フィルター。
（請求項３） スクリムがメタ型アラミド繊維からなる請求項１または２記載の耐酸性フィルター。
（請求項４） フェルトがメタ型アラミド繊維からなる請求項１〜３のいずれか１項に記載の耐酸性フィルター。」である。
【０００６】
スクリム或いはフェルトを構成する繊維は耐熱性フィルター用として従来知られている繊維であり、例えば炭素繊維、金属繊維、ガラス繊維、有機耐熱性繊維などである。有機耐熱性繊維としてはメタ型アラミド繊維、ポリフェニレントリアゾール繊維、ポリオキシジアゾール繊維、ポリイミド繊維、ポリベンゾイミダゾール繊維などである。メタ型アラミドとは、メタ型芳香族ジアミンとメタ型芳香族ジカルボン酸との反応により生成するポリマー或いはそのコポリマーである。典型的な例はメタフェニレンジアミンとイソフタル酸ジクロライドとの反応により生成するポリメタフェニレンイソフタルアミドを主成分とするポリマーである。
【０００７】
スクリムの加工、フェルトの加工に適用するフッ素系樹脂とは、四フッ化エチレン（略称：ＰＴＦＥ）、四フッ化エチレン・パーフルオロビニルエーテル共重合体（略称：ＰＦＡ）、四フッ化エチレン・六フッ化プロピレン共重合体などである。これらのフッ素系樹脂を微粒子化し、水に分散させたディスパージョンが表面処理剤として使用される。架橋成分として添加されるブロックドポリイソシアネート化合物とは、ポリイソシアネート化合物とブロック化剤との付加物であり、加熱によりブロック成分が遊離して活性なポリイソシアネート化合物を生ぜしめるものである。ポリイソシアネート化合物としては、例えばトリレンジイソシアネート、メタフェニレンジイソシアネート、ジフェニルメタンジイソシアネート、ヘキサメチレンジイソシアネート、ポリメチレンポリフェニルイソシアネート、トリフェニルメタントリイソシアネート等のポリイソシアネート、或いはこれらのポリイソシアネートと、活性水素原子を２個以上有する化合物、例えばトリメチロールプロパン、ペンタエリスリトール等とをイソシアネート基（−ＮＣＯ）とヒドロキシル基（−ＯＨ）の比が１を越えるモル比で反応させて得られる末端イソシアネート基含有のポリアルキレングリコールアダクトポリイソシアネートなどが挙げられる。特にトリレジンイソシアネートジ、フェニルメタンジイソシアネート、ポリメチレンポリフェニルイソシアネートの如き芳香族ポリイソシアネートが優れた性能を発現するので好ましい。
【０００８】
ブロック化剤としては、例えばフェノール、チオフェノール、クレゾール、レゾルシノール等のフェノール類、ジフェニルアミン、キシリジン等の芳香族第２級アミン類、フタル酸イミド類、カプロラクタム、バレロラクタム等のラクタム類、アセトキシム、メチルエチルケトンオキシム、シクロヘキサンオキシム等のオキシム類および酸性亜硫酸ソーダなどを用いる。
【０００９】
本発明では、更に耐熱性を有するクレゾールノボラック型エポキシ化合物を添加配合するが、これは次式（化１）で表されるものである。
【００１０】
【化１】
上記（化１）を満足する化合物としては分子量１２００〜１３００、エポキシ価４．０〜４．５ｅｑ／ｋｇのものが好ましい。
【００１２】
フィルターの耐酸加工に使用する無機微粒子としては、アルミナゾルが好ましい。他の無機微粒子でも効果はあるが、処理後の加工布の硬さが増加するなどの問題を生ずる。ここで言うアルミナゾルとは、５〜２００ｍμのコロイドの大きさを有するアルミナ水和物であり、重合粒子が水中の陰イオンを安定剤として分散している液体である。特に、羽毛状粒子の集合体が好ましい。この羽毛状粒子の１個は約６０万個のアルミナが重合して出来たものであり、それだけ耐熱性、耐薬品性に優れている。コロイドに安定性を付与するため、陰イオンが粒子の表面及びその近傍に配位されてなる水溶液である。粒子形状は、羽毛状だけではなく、球状のものなども用いることができる。
【００１３】
本発明の製造方法は、例えば、先ず、フィルターを構成する基布に、フッ素系樹脂に架橋成分としてブロックドポリイソシアネート化合物及びクレゾールノボラック型エポキシ化合物を添加した樹脂を付与し、それに繊維のカット綿を配し、ニードルパンチングを行いフェルトを作る。次いで、先ず羽毛状粒子の形態を有するアルミナゾルを含浸により付与し、乾燥後、引き続きフッ素系樹脂を含浸処理し、マングルで絞り、乾燥し、熱処理を行うことにより、適度な硬さと樹脂付着量を有する耐酸性フィルターを得た。
【００１４】
【発明の効果】
本発明の耐酸性フィルターを、各種焼却炉のフィルターに用いると、焼却排ガス中に含有される、硫酸ミスト、塩酸ミストに高温雰囲気中で暴露されても、使用している繊維材料は化学劣化を受けることなく、本来の性能を維持発揮できる。
【００１５】
以下、実施例により、本発明を具体的に説明する。
【００１６】
【実施例１〜４、比較例１〜４】
メタ型アラミド繊維（商品名：コーネックス、帝人株式会社製）からなるスクリム；タテ、ヨコとも１０００デニール（撚り数；１２０回／ｍ）の繊維からなる平織り物（タテ、ヨコとも、１３〜１５本／インチ）を、ＰＴＦＥ水分散液（商品名：Ｄ−１、ダイキン工業株式会社製、濃度６０％）１００ｇに、ブロックドポリイソシアネート（商品名：プロミネートＸＣ９４５、武田薬品工業株式会社製、濃度３９％）２０ｇとフェノールノボラックエポキシ化合物（商品名；ＥＭ１２５、ナガセ化成株式会社製、濃度２５％）１５ｇを添加配合した加工剤中に浸漬、絞りを繰り返し、樹脂分を繊維重量対比１５％付着させ、１４０℃で乾燥させる。次いで、このスクリムを基布として、その両側に、同じくメタ型アラミド繊維（商品名：コーネックス、帝人株式会社製）の、単糸繊度０．７５〜５デニール、繊維長３６〜７２ｍｍのカット綿を、目付け５００ｇ／ｍ2 となるように配し、ニードルパンチングを行い、フェルトを作製した。
【００１７】
次に、このフェルトを羽毛状アルミナゾルの水分散液（商品名；日産化学株式会社製、濃度１０％）中に浸漬、絞りを行い、１５０℃で乾燥させ、繊維重量に対し１５％付着させた。次いで、ＰＴＦＥ水分散液（商品名：Ｄ−１、ダイキン工業株式会社製、濃度６０％）の８％液中に浸漬、絞りを行い、１５０℃で乾燥、引き続き２５０℃で熱処理を行い、繊維重量に対し１０％の樹脂を付着させた。
【００１８】
得られた耐酸性フィルターの耐酸性能をモデル的に評価すると、その性能が大幅に向上しており、実際に焼却炉で排ガスの集塵フィルターに使用したときの耐久性も大幅に向上した。
＜耐酸性モデル評価法＞
耐酸性フィルターサンプルを、７％硫酸水溶液中に浸漬し、８０ｍｍＨｇの減圧雰囲気中で３時間保持し、耐酸性フィルターのフェルト内部にまで均一に硫酸を浸透させる。その後、取り出し、表面に付着した硫酸を軽く拭き取り、そのまま、１５０℃の熱風乾燥機中で１時間保持した。この処理前後での、フェルトの強度変化から耐酸性能を評価した。結果を表１に示す。
【００１９】
【表１】
Ｆ：ＰＴＦＥ樹脂水分散液
ｉＣｙ：ブロックドイソシアネート化合物
Ｅｐ：クレゾールノボラック樹脂
アルミナはアルミナゾルを意味する。
【００２１】
比較例は、本発明の要件である、加工剤中の成分が全て配合されていない場合、もしくは表面加工されていない場合の性能を表している。表からも判る様に、本発明の効果は顕著である。[0001]
[Industrial applications]
The acid-resistant filter of the present invention is used as a bag filter or the like for collecting fine particles in exhaust gas such as exhaust gas from a municipal garbage incinerator and factory exhaust gas.
[0002]
[Prior art]
At present, various filters are known as dust collection filters. In particular, as a heat resistant filter, for example, `` a web mainly made of carbon fiber is arranged in a layer on the front side when using a filter cloth, and a web made of organic heat resistant fiber is arranged in another layer, and a spatter resistant Needle filter cloth for dust collection having properties "(Japanese Utility Model Laid-Open No. 59-162913). Generally, metal fibers, glass fibers, and the like are often used as the fibers for the dust collecting filter, and particularly, meta-type aramid fibers are often used.
[0003]
Meta-type aramid fibers have excellent heat resistance, and are widely used in fields exposed to high temperatures by utilizing the heat resistance. It is widely used as a material for bag filters that trap fine particles in exhaust gas from city refuse incinerators. However, since the exhaust gas contains sulfuric acid mist, hydrochloric acid mist, and the like, and is operated in a high-temperature state for a long period of time, troubles such as deterioration of the filter cloth and breakage of the bag on the way may occur. In order to prevent this, it has been proposed to coat the filter cloth with an N-methylol resin (Japanese Patent Publication No. 51-34586) and to coat the filter cloth with inorganic fine particles such as alumina and a fluorine resin. However, it is not perfect depending on the operating conditions (Japanese Patent Publication No. 4-60685). Thus, the inventors have conducted intensive studies and as a result have arrived at the present invention.
[0004]
[Object of the invention]
The present invention has been made in view of the above circumstances. An object of the present invention is to provide an acid-resistant filter that can exhibit its characteristics as a filter even in a more severe acidic atmosphere without impairing the characteristics of the fibers constituting the filter.
[0005]
Configuration of the Invention
That is, the present invention provides "(Claim 1) In a filter in which felt is integrally molded with a scrim, the scrim is a scrim to which a processing agent in which a blocked polyisocyanate compound and a phenol novolak compound are blended in advance with a fluororesin is applied. An acid-resistant filter, characterized in that:
(Claim 2) filter further, acid resistance The filter of claim 1, wherein treated with fluorine-based resin containing inorganic fine particles.
(Claim 3) according to claim 1 or 2, acid resistance filter described scrim consisting meta-aramid fibers.
Acid resistance filter according to any one of (claims 4) according to claim 1 to 3 felt made of meta-aramid fibers. ".
[0006]
The fiber constituting the scrim or the felt is a fiber conventionally known for a heat resistant filter, such as a carbon fiber, a metal fiber, a glass fiber, and an organic heat resistant fiber. Examples of the organic heat-resistant fiber include meta-aramid fiber, polyphenylenetriazole fiber, polyoxydiazole fiber, polyimide fiber, and polybenzimidazole fiber. The meta-type aramid is a polymer or a copolymer thereof formed by reacting a meta-type aromatic diamine with a meta-type aromatic dicarboxylic acid. A typical example is a polymer based on polymetaphenylene isophthalamide formed by the reaction of metaphenylenediamine with isophthalic dichloride.
[0007]
Fluorinated resins used for scrim processing and felt processing include ethylene tetrafluoride (abbreviation: PTFE), ethylene tetrafluoride / perfluorovinyl ether copolymer (abbreviation: PFA), And the like. A dispersion in which these fluorine-based resins are finely divided and dispersed in water is used as a surface treatment agent. The blocked polyisocyanate compound added as a cross-linking component is an adduct of a polyisocyanate compound and a blocking agent, and releases a blocking component upon heating to generate an active polyisocyanate compound. Examples of the polyisocyanate compound include polyisocyanates such as tolylene diisocyanate, metaphenylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, polymethylene polyphenyl isocyanate, and triphenylmethane triisocyanate, or those polyisocyanates and two hydrogen atoms. Isocyanate group-containing polyalkylene glycol obtained by reacting a compound having at least one compound such as trimethylolpropane, pentaerythritol or the like with a molar ratio of isocyanate group (-NCO) to hydroxyl group (-OH) exceeding 1 Adduct polyisocyanate and the like can be mentioned. In particular, aromatic polyisocyanates such as triresin isocyanate di, phenylmethane diisocyanate, and polymethylene polyphenyl isocyanate are preferred because they exhibit excellent performance.
[0008]
Examples of the blocking agent include phenols such as phenol, thiophenol, cresol and resorcinol; aromatic secondary amines such as diphenylamine and xylidine; phthalamides, lactams such as caprolactam and valerolactam, acetoxime and methyl ethyl ketone. Oximes such as oxime and cyclohexane oxime, and sodium acid sulfite are used.
[0009]
In the present invention, a cresol novolak type epoxy compound having heat resistance is further added and compounded, which is represented by the following formula (Formula 1).
[0010]
Embedded image
As the compound satisfying the above (Chemical formula 1), those having a molecular weight of 1200 to 1300 and an epoxy value of 4.0 to 4.5 eq / kg are preferable.
[0012]
Alumina sol is preferred as the inorganic fine particles used for the acid-resistant processing of the filter. Although other inorganic fine particles are effective, they cause problems such as an increase in hardness of the processed cloth after the treatment. The alumina sol referred to here is an alumina hydrate having a colloidal size of 5 to 200 mμ, and is a liquid in which polymer particles are dispersed with an anion in water as a stabilizer. In particular, an aggregate of feather-like particles is preferable. One of the feather-like particles is formed by polymerization of about 600,000 alumina, and thus has excellent heat resistance and chemical resistance. This is an aqueous solution in which anions are coordinated on the surface of the particles and in the vicinity thereof in order to impart stability to the colloid. As the particle shape, not only a feather shape but also a spherical shape can be used.
[0013]
In the production method of the present invention, for example, first, a resin obtained by adding a blocked polyisocyanate compound and a cresol novolak-type epoxy compound as a crosslinking component to a fluororesin is applied to a base fabric constituting a filter, and a fiber cut cotton is added thereto. And perform needle punching to make felt. Next, first, an alumina sol having the form of feather-like particles is applied by impregnation, and after drying, is impregnated with a fluorine-based resin, squeezed with a mangle, dried, and heat-treated, so that moderate hardness and resin adhesion amount are obtained. An acid resistant filter was obtained.
[0014]
【The invention's effect】
When the acid-resistant filter of the present invention is used for filters of various incinerators, the fiber material used undergoes chemical deterioration even when exposed to a sulfuric acid mist or a hydrochloric acid mist contained in incineration exhaust gas in a high-temperature atmosphere. The original performance can be maintained and exhibited without receiving it.
[0015]
Hereinafter, the present invention will be specifically described with reference to examples.
[0016]
[Examples 1-4, Comparative Example 1-4]
Scrim made of meta-type aramid fiber (trade name: Conex, manufactured by Teijin Limited); plain weave made of 1000 denier (twist; 120 times / m) fibers (both vertical and horizontal) Pcs / inch) in 100 g of an aqueous PTFE dispersion (trade name: D-1, manufactured by Daikin Industries, Ltd., concentration: 60%), and blocked polyisocyanate (trade name: Prominate XC945, manufactured by Takeda Pharmaceutical Co., Ltd.) 39%) and 15 g of a phenol novolak epoxy compound (trade name: EM125, manufactured by Nagase Kasei Co., Ltd., 25% concentration) were immersed and repeatedly squeezed in a processing agent in which the resin component was adhered by 15% based on the fiber weight. , Dried at 140 ° C. Next, using this scrim as a base fabric, cut cotton having a single yarn fineness of 0.75 to 5 denier and a fiber length of 36 to 72 mm of the same meta-aramid fiber (trade name: Conex, manufactured by Teijin Limited) on both sides. Was arranged so as to have a basis weight of 500 g / m 2, and needle punching was performed to produce a felt.
[0017]
Next, this felt was immersed in an aqueous dispersion of feathery alumina sol (trade name; manufactured by Nissan Chemical Co., Ltd., concentration: 10%), squeezed, dried at 150 ° C., and adhered by 15% to the fiber weight. . Then, it was immersed in an 8% solution of an aqueous PTFE dispersion (trade name: D-1, manufactured by Daikin Industries, Ltd., concentration: 60%), squeezed, dried at 150 ° C, and subsequently heat-treated at 250 ° C to obtain a fiber. 10% resin by weight was deposited.
[0018]
When the acid resistance performance of the obtained acid resistant filter was modeled and evaluated, the performance was greatly improved, and the durability when actually used as an exhaust gas dust filter in an incinerator was also significantly improved.
<Acid resistance model evaluation method>
The acid-resistant filter sample is immersed in a 7% sulfuric acid aqueous solution, kept in a reduced pressure atmosphere of 80 mmHg for 3 hours, and the sulfuric acid is uniformly penetrated into the felt of the acid-resistant filter. Thereafter, it was taken out, the sulfuric acid adhering to the surface was gently wiped off, and kept as it was in a hot air dryer at 150 ° C. for 1 hour. The acid resistance performance was evaluated from the change in felt strength before and after this treatment. Table 1 shows the results.
[0019]
[Table 1]
F : PTFE resin aqueous dispersion iCy: blocked isocyanate compound Ep: cresol novolak resin Alumina means alumina sol.
[0021]
The comparative examples show the performance required when all the components in the processing agent are not blended or when the surface is not processed, which is a requirement of the present invention. As can be seen from the table, the effect of the present invention is remarkable.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00964895A JP3554594B2 (en) | 1995-01-25 | 1995-01-25 | Acid resistant filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00964895A JP3554594B2 (en) | 1995-01-25 | 1995-01-25 | Acid resistant filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08196831A JPH08196831A (en) | 1996-08-06 |
| JP3554594B2 true JP3554594B2 (en) | 2004-08-18 |
Family
ID=11726044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00964895A Expired - Lifetime JP3554594B2 (en) | 1995-01-25 | 1995-01-25 | Acid resistant filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3554594B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009172602A (en) * | 2009-03-19 | 2009-08-06 | Yoshikazu Saito | Filter and method for processing surface of filter |
-
1995
- 1995-01-25 JP JP00964895A patent/JP3554594B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08196831A (en) | 1996-08-06 |
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