JP3546567B2 - Grease filter and manufacturing method thereof - Google Patents

Description

【０００５】
一方、捕集した油分の回収は出来るだけ多くかつ迅速であることが望ましい。言い換えればオイルミストの付着している時間が短時間であるほうが良い。
【０００６】
【課題を解決しようとする課題】
従来、このような厨房用グリスフィルターとして、図５に示すようなバッフル型のものが用いられており、このバッフル型のグリスフィルターａは図の矢印のように油脂のミストを含む空気の流れ方向を２枚のバッフルｂ、ｃで急角度で変化させてバッフルｂ、Ｃに空気を衝突させることにより、機械的に排気中の油脂をバッフルｂ、Ｃに付着させ、バッフルｂ、Ｃに沿って油脂を流し、下部の油分回収容器に油脂を回収するものである。
しかし、このようなバッフル型のグリスフィルターは、通気性が大きく、吸引ブロアーに大きな負担がかかるという問題がある。その他、設備自身が大掛かりであり、更にオイルミストを除去・清掃することも必ずしも簡単ではない。
【０００７】
この為、本出願人は、先にバッフルプレートの代わりに三次元網状骨格を有するセラミック多孔体をグリスフィルターとして用いることを提案した（実開昭６３−１１８９１５号公報）。このセラミック多孔体は、セル膜の無い三次元網状骨格構造を有するポリウレタンフォームをセラミック材料からなる泥漿に浸漬し、余剰の泥漿を除去し、次いで焼成することにより得られるものである。
このような三次元網状骨格を有するセラミック多孔体を用いたグリスフィルターは、油脂のミストを含んだ空気がセラミックの骨格に衝突し、骨格に沿って油脂が流れて油脂を回収するものであり、その構造的な特徴からバッフルプレートに比べて除去性能が良好である。
【０００８】
しかしながら、セラミック多孔体の表面には微細な気孔があり、吸い込まれたオイルミストが骨格に衝突した際、気孔内に侵入してオイルを抱き込み、使用中に火災が発生した場合この侵入したオイルに着火する危険性もある。その為、骨格表面の気孔を出来るだけなくすべく種々な対策が採られる。例えばスラリー中にアルカリ金属酸化物等によるガラス化剤を添加したり、焼成温度を高めたりしてセラミック多孔体を緻密化させる方法が有効である。しかし、この方法は寸法安定性が保てない欠点を有している。そこで、本発明者らは焼成温度より低い温度で融解する釉薬などをコーティングし骨格表面を緻密化する方法をも提案した。（特開平５−２９３３１９号公報）
【０００９】
しかし、この方法は焼成温度は異なるが２回の焼成、及び釉薬コート工程が必要な為コストが高価となってしまう。そこでコストを下げ、かつ骨格の緻密化を高め、吸油率の良いセラミックグリスフィルターが求められていた。
本発明は、上記事情に鑑みてなされたもので、釉薬コートを省き１回の焼成でも釉薬コート処理した前記提案のセラミックフィルター以上に吸油率が少ない、優れた除去性能を有する厨房用などのグリスフィルター及びその製造方法を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明者らは、上記目的を達成する為鋭意検討を重ねた結果、先ずは、該グリスフィルターが、請求項１〜６に記載の如く、即ち、請求項１に記載の如く、厨房や機械加工等で発生するオイルミスト等の除去や回収のために用いられるグリスフィルターにおいて、その表面に金属酸化物系ポリマーを用いて皮膜層を設けたことを特徴とするグリスフィルターであり、請求項２に記載の如く、グリスフィルター基材が、内部連通空間を有する三次元網状骨格構造の合成樹脂発泡体にセラミックスラリーを付着させ、乾燥させ、焼成して得られる三次元網状構造のセラミック多孔体の骨格表面全体あるいは一部に上記金属酸化物系ポリマーの皮膜層を設けたことを特徴とするグリスフィルターであり、請求項３に記載の如く、前記内部空間を有する三次元網状骨格構造の合成樹脂発泡体がポリウレタンであることを特徴とし、更に、請求項４に記載の如く、前記金属酸化物系ポリマーが、金属化合物の溶液から出発し溶液中での化合物の縮合・重合によって溶液を金属酸化物ポリマーとなすことを特徴とするグリスフィルターであり、更に、請求項５に記載の如く、前記金属酸化物系ポリマーとして、アルカリ金属、オルガノポリ金属、オルガノアルコキシ金属、アルコキシ金属、変性アセチルアセテート金属のいずれか１種または２種以上を用いたことを特徴とし、更には、請求項６記載のように、前記金属酸化物系ポリマーが１ｂ族の金属元素を含むことを特徴とするグリスフィルターとしたものである。
【００１１】
そして、本発明の上記グリスフィルターの製造方法としては、請求項７〜１１に記載、即ち、請求項７に記載の如く、該グリスフィルター基材が、内部連通空間を有する三次元網状骨格構造の合成樹脂発泡体にセラミックスラリーを付着させ、乾燥させ、焼成して得られる三次元網状構造のセラミック多孔体の骨格表面全体あるいは一部に上記金属酸化物系ポリマーの皮膜層を設けたことを特徴とするグリスフィルターの製造方法としたものであり、請求項８に記載の如く、前記内部空間を有する三次元網状骨格構造の合成樹脂発泡体がポリウレタンであることを特徴とし、そして、請求項９に記載の如く、前記金属酸化物系ポリマーが、金属化合物の溶液から出発し溶液中での化合物の縮合・重合によって溶液を金属酸化物ポリマーとなすことを特徴とし、更には、請求項１０に記載の如く、前記金属酸化物系ポリマーとして、アルカリ金属、オルガノポリ金属、オルガノアルコキシ金属、アルコキシ金属、変性アセチルアセテート金属のいずれか１種または２種以上を用いたことを特徴とするグリスフィルターの製造方法であり、また、請求項１１に記載の如く、前記金属酸化物系ポリマーが１ｂ族の金属元素を含むことを特徴とするグリスフィルターの製造方法としたことである。
【００１２】
【発明の実施の形態】
即ち本発明者らは、上記目的を達成させる為に鋭意検討を重ねた結果、オイルミスト等の除去や回収の為に用いられるグリスフィルターにおいて、その表面に金属酸化物系ポリマーで表面全体或いはその一部に皮膜層を設けることにより、グリスフィルター基体がセラミックばかりでなく金属でも吸油率が少ない厨房用グリスフィルターに最適であることを見い出し本発明をなすに至ったものである。
無論、内部連通空間を有する三次元網状骨格構造の合成樹脂発泡体にセラミックスラリーを付着させ、乾燥、焼成して得られる三次元網状骨格構造を有するセラミックフィルターの骨格表面全体或はその一部に金属酸化物系ポリマーの皮膜層を設ければ骨格を釉薬でガラス化した以上の吸油率の低下やグリスフィルターの除去性能の向上が得られる。
【００１３】
以下、本発明について更に詳しく説明する。
本発明の、特には厨房用グリスフィルターは、上述したように基体に、例えば従来のセラミックフィルターの骨格表面全体または一部に金属酸化物系ポリマーの皮膜層を設けるものである。
この金属酸化物系ポリマーは液体状の金属酸化物系ポリマーを用い、縮合脱水反応によりセラミック皮膜を形成させる。このような液相から出発して得たセラミックの粒は数オングストロームから数十オングストロームの非常に小さい粒が得られる。この小さな粒は基体表面の凹凸を平滑化し、緻密化すると共に皮膜表面は正の電荷を帯びる。
ここに負の電荷を持つオイルミストが衝突すると基体表面の正の電荷が中和されると同時に、更に侵入してくる負の電荷を持ったオイルミストによって基体表面が負の電荷となり、オイルミストは反発して基体に付着しなくなる。
勿論、他の方法で基体表面を予め負の電荷を持つようにしておいても良い。
或は又何等かの方法で予め基体を正電荷・負の電荷を有するものとして、この電荷を正電荷と負の電荷を変えられるようにして、先ずは正電荷として負の電荷であるオイルミストを＋と−荷により捕集し、捕集後に基体を負の電荷にすることによりオイルミストを反発させて基体から離して一挙に回収・除去することも可能となる。
【００１４】
また、金属酸化物系ポリマーにおいて、１ｂ族の金属元素（Ｃｕ、Ａｇ、Ａｕ）が存在するとオイルミストを細分化し、より前記の現象が促進される他、グリスフィルター中のオイルミストが長時間堆積すると酸化が起こり過酸化物となりラジカルを発生するようになる。このような時に１ｂ族の金属元素は基体から生じた過酸化物から発生するラジカルを失活させるので発火の危険性もなくなる。この作用を応用し本発明を完成させた。金属酸化物系ポリマーとしてはアルカル金属、オルガノポリ金属、オルガノアルコキシ金属、アルコキシ金属、変性アセチルアセテート金属等が挙げられる。
【００１５】
皮膜形成状態はフィルター骨格全体あるいは衝突する側の一部でも効果は達せられることも分かった。
なお、本発明はグリスフィルターを目的にして検討を重ねてきたが、塵、排ガス等を反発させて清浄化するのに用いても良い。
【００１６】
本発明の厨房用グリスフィルターは、かさ比重が０．３〜０．７、好ましくは０．４〜０．５であり、空孔数が直線２５ｍｍ当たり６〜２０個、特に９〜１３個であることが好ましい。ここで、かさ比重が０．３より小さいと骨格が細く耐久性に欠ける。また、０．７より大きいと目詰まり割合が多くなって圧力損失が大きくなり、また吸引音も大きくなり作業に支障を来す場合がある。
更に、空孔数が６以下ではミストと骨格の衝突割合が小さく除去性能が劣り、２０以上では圧力損失・吸引音が大きくなり、作業性に支障を来す場合がある。更には、吸引に過大な付加をブロアーに与えるので排気ファン等の故障を誘発し易くなる。
【００１７】
本発明の厨房用セラミックフィルターを得るには、先ず、常法に従いセラミックフィルターを製造した後に、上述の如く金属酸化物系ポリマーにより該フィルター表面に皮膜形成処理を行う。
セラミックフィルターを得るには、合成樹脂発泡体を基材として、これにアルミナ、ムライト、コージライトなどのセラミック粉体や木節粘土、カオリンなどの粘土鉱物をスラリー状にして付着させた後、余剰のスラリーを除去し、乾燥し、焼成して得ることが出来る。この場合、合成樹脂発泡体としてはセル膜の無い網状骨格化した軟質ポリウレタンフォームが好適に用いられる。
【００１８】
また、上記スラリーは、上記セラミック成分に加えポリビニルアルコール、ＣＭＣ等のバインダー、ケブラチオ等の解膠材、及び水等を添加して、目開き性を調整のためにスラリーのチクソトロピック性能を調整することもできる。
上記スラリーの粘度は、目的とするセラミックフィルターのセルの大きさ、或はかさ比重により、水の添加量を加減して調節することが出来、通常１２０〜１６０ポイズに調整されることが望ましい。
このスラリーに合成樹脂発泡体、例えば、直線２５ｍｍ当りの空孔数が６〜２０個のセル膜の無い三次元網状骨格構造を有するポリウレタンフォームを浸漬し、該スラリーを付着させた後、余剰のスラリーを除去するが、この除去方法としては、ロールによるプレス、遠心分離、エアー吹き付け等の適宜な方法を採用することが出来る。また、必要に応じて上記スラリーを薄めて、スラリーを付着させた基体上にスプレー等で塗布しても良い。
次いで、スラリーを付着させた後、乾燥し、焼成する。焼成温度は１１００〜１４００℃で焼成する。
【００１９】
このようにして得られたセラミックフィルターを前記金属酸化物系ポリマーをアルコールなどの希釈液により所定濃度にして含浸させ、付着後８０〜１５０℃で乾燥させることにより簡単に皮膜を形成させることが出来る。またはスプレーを用いて骨格表面に塗布しても良い。乾燥中に金属酸化物ポリマーが脱水縮合反応して皮膜形成する。
【００２０】
【実施例】
以下、実施例、比較例を示して本発明を具体的に示すが、本発明は下記実施例に限定されるものではない。
［実施例１］
アルミナ８０部と木節粘土を２０部、ポリビニルアルコール４部、ケブラチオ０．１部に水２３部を加え、粘度１６０ポイズのセラミックスラリーを作成した。このスラリーに直線２５ｍｍ当りのセル数が１０個の２４５×４９５×２５ｍｍのセル膜の無い三次元網状骨格構造を有するポリウレタンフォームを含浸した。
余分なスラリーをロールにより除去した後、除去したスラリーを３０ポイズに薄めて、スプレーで骨格表面を被覆割合が含浸後の１０％となるように被覆し、６０℃で１６時間乾燥した。次いで、１２００℃で焼成を行いセラミックフィルターを得た。
そして、本発明である一例、即ち金属酸化物系ポリマーとしてＳｉ、Ａｌを含有するアルコキシ金属の８５％アルコール溶液（（株）日板研究所製セラミカＧ１９２）をセラミックフィルターにスプレ−により塗布した。次いで１２０℃で３時間乾燥を行いグリスフィルターを得た。付着量は２．７％であった。
【００２１】
［比較例１］
比較例１は、念の為上記実施例において得られたセラミックフィルターに本発明の金属酸化物系ポリマーによる基材表皮への皮膜層を行わないものを用いた。
【００２２】
［比較例２］
比較例１のセラミックフィルターに、融点１１００℃のアルミナ系釉薬に含浸し、余剰のスラリーを遠心分離機により除去し、６０℃で８時間乾燥後、１１５０℃で焼成したもので、本例も本発明の金属酸化物系ポリマーによる皮膜形成の為の塗布を行わないものを用いた。（特開平５−２９３３１９号公報）
【００２３】
上記実施例・比較例で得られた各フィルターをオイルミスト除去性能試験を行い、その結果を表１に示した。
【表１】

【００２４】
【発明の効果】
以上、詳細に説明したように、三次元網状骨格構造を有するセラミックフィルターに本発明の金属酸化物ポリマーを骨格表面に塗布することによりグリスフィルター性能は、捕集したオイルミストを従来の釉薬コーティングした以上に、吸油率が低下し、より素早く除去する除去率の優れた効果を有するグリスフィルターが得られた。
【図面の簡単な説明】
【図１】本発明のセラミックフィルターを示す斜視図である。
【図２】本発明に使用されるグリスフィルター用三次元網状骨格構造のセラミック多孔体の一部を拡大した図である。
【図３】オイルミスト発生装置（正面図）の該略図である。
【図４】オイルミスト発生装置（側面図）の該略図である。
【図５】従来のバッフル型の厨房用グリスフィルターを示す断面該略図である。
【符号の説明】
１ セラミックグリスター
２ セラミック多孔体
３ ステンレス枠
４ 油分回収孔
２１ オイルミスト発生装置
２２ グリスフィルター
２３ ダクト
２４ 水タンク
２５ 油タンク
２６ ヒーター
２７ オイルパン
２８ 回収油分樋
２９ 回収油分流通管
３０ 回収油分受け
３１ ブロア[0001]
[Field of the Invention]
The present invention relates to a grease filter used for an exhaust duct or the like for removing oil mist generated in a kitchen or machining.
[0002]
[Prior art]
Conventionally, the vapors and mist of oils and fats generated from the kitchen adhere to the exhaust duct and accumulate in the duct to reduce the exhaust efficiency, and the attached oils and fats cause propagation in the event of a fire. There is a concern that this may lead to worsening or the spread of disasters in the event of a fire. To prevent this, grease filters are installed in the exhaust duct of kitchens to collect oils and fats.
[0003]
This kitchen grease filter has high collection efficiency of oil and fat mist in the air, high collection efficiency of oil and fat collected once, low airflow resistance, little change in airflow resistance with time, etc. Characteristics are required. Further, the grease filter is washed with an alkaline solution or the like in order to remove oils and fats attached to the grease filter during use and to regenerate the filter.
[0004]
In this case, the removal rate representing the collection efficiency is calculated by the following equation, and the grease filter generally requires that the removal rate be 75% or more.
(Equation 1)

[0005]
On the other hand, it is desirable that the collected oil is recovered as much and as quickly as possible. In other words, it is better that the time during which the oil mist is attached is short.
[0006]
[Problem to be solved]
Conventionally, as such a kitchen grease filter, a baffle-type grease filter as shown in FIG. 5 has been used, and the baffle-type grease filter a has a flow direction of air containing mist of oils and fats as shown by an arrow in the figure. Is steeply changed by the two baffles b and c to impinge the air on the baffles b and C, thereby causing the fats and oils in the exhaust to be mechanically adhered to the baffles b and C. The fats and oils are poured, and the fats and fats are collected in a lower oil collecting container.
However, such a baffle type grease filter has a problem that the air permeability is large and a heavy load is imposed on the suction blower. In addition, the equipment itself is large and it is not always easy to remove and clean the oil mist.
[0007]
For this reason, the present applicant has previously proposed using a ceramic porous body having a three-dimensional network skeleton as a grease filter instead of a baffle plate (Japanese Utility Model Laid-Open No. 63-189915). This porous ceramic body is obtained by immersing a polyurethane foam having a three-dimensional network skeleton structure without a cell membrane in a slurry made of a ceramic material, removing excess slurry, and then firing.
A grease filter using a ceramic porous body having such a three-dimensional network skeleton is a device in which air containing mist of oil and fat collides with the skeleton of the ceramic, and the oil and fat flows along the skeleton to collect the oil and fat, Due to its structural characteristics, the removal performance is better than that of the baffle plate.
[0008]
However, there are fine pores on the surface of the porous ceramic body, and when the sucked oil mist collides with the skeleton, it penetrates the pores and embraces the oil. There is a risk of ignition. Therefore, various measures are taken to minimize the pores on the skeleton surface. For example, it is effective to add a vitrification agent such as an alkali metal oxide to the slurry or to raise the firing temperature to densify the ceramic porous body. However, this method has a disadvantage that dimensional stability cannot be maintained. Therefore, the present inventors have also proposed a method of coating a glaze or the like that melts at a temperature lower than the firing temperature to densify the skeleton surface. (JP-A-5-293319)
[0009]
However, this method requires different firing temperatures but requires two firings and a glaze coating step, so that the cost is high. Therefore, there has been a demand for a ceramic grease filter having a high oil absorption and a reduced cost, and a higher density of the skeleton.
The present invention has been made in view of the above circumstances, and eliminates the glaze coating and has a lower oil absorption rate than the above-mentioned ceramic filter which has been subjected to the glaze coating treatment even in one firing, and has excellent removal performance for kitchen grease. An object of the present invention is to provide a filter and a method for manufacturing the filter.
[0010]
[Means for Solving the Problems]
The present inventors have conducted intensive studies in order to achieve the above object. As a result, first, the grease filter is provided in a kitchen or a machine as described in claims 1 to 6, that is, as described in claim 1. A grease filter used for removing or collecting oil mist or the like generated during processing or the like, wherein a grease filter is provided on its surface with a film layer using a metal oxide polymer. As described in the above, the grease filter substrate, a ceramic slurry is attached to a synthetic resin foam having a three-dimensional network skeleton structure having an internal communication space, dried, and a three-dimensional network ceramic porous body obtained by firing. A grease filter characterized in that a coating layer of the metal oxide polymer is provided on the whole or a part of the skeleton surface, and the grease filter has the internal space as described in claim 3. The synthetic resin foam having a three-dimensional network skeleton structure is a polyurethane, and the metal oxide-based polymer starts from a solution of the metal compound and forms the compound in the solution as described in claim 4. A grease filter, wherein the solution is formed into a metal oxide polymer by condensation / polymerization. Further, as the metal oxide-based polymer, an alkali metal, an organopoly metal, an organoalkoxy metal, Wherein one or more of an alkoxy metal and a modified acetyl acetate metal are used, and the metal oxide-based polymer contains a 1b group metal element as described in claim 6. This is a grease filter characterized by the following.
[0011]
And as a manufacturing method of the grease filter of the present invention, the grease filter substrate according to claims 7 to 11, that is, as described in claim 7, the grease filter substrate has a three-dimensional network skeleton structure having an internal communication space. A ceramic slurry is adhered to a synthetic resin foam, dried, and fired. A coating layer of the above metal oxide polymer is provided on the whole or a part of the skeleton surface of the ceramic porous body having a three-dimensional network structure. 10. A method for producing a grease filter according to claim 8, wherein the synthetic resin foam having a three-dimensional network skeleton structure having the internal space is polyurethane. As described in the above, the metal oxide-based polymer is converted into a metal oxide polymer by condensing and polymerizing the compound in the solution starting from a solution of the metal compound. Further, as described in claim 10, any one or more of alkali metal, organopoly metal, organoalkoxy metal, alkoxy metal, and modified acetyl acetate metal are used as the metal oxide-based polymer. A method for producing a grease filter, characterized in that the metal oxide-based polymer contains a 1b group metal element, as described in claim 11. It was that.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
That is, the present inventors have conducted intensive studies in order to achieve the above object, and as a result, in a grease filter used for removal or recovery of oil mist or the like, the entire surface of the grease filter is made of a metal oxide-based polymer, By providing a coating layer on a part, it has been found that the grease filter substrate is most suitable for a kitchen grease filter having a low oil absorption rate not only of ceramics but also of metal, and has accomplished the present invention.
Needless to say, a ceramic slurry is attached to a synthetic resin foam having a three-dimensional network skeleton structure having an internal communication space, dried, and fired, and the entire or a part of the skeleton surface of the ceramic filter having the three-dimensional network skeleton structure obtained. By providing a metal oxide polymer film layer, it is possible to reduce the oil absorption rate and improve the removal performance of the grease filter as compared with the case where the skeleton is vitrified with a glaze.
[0013]
Hereinafter, the present invention will be described in more detail.
The grease filter of the present invention, particularly for a kitchen grease filter, is provided with a metal oxide polymer film layer on the entire surface or a part of the skeleton surface of a conventional ceramic filter, as described above.
As the metal oxide-based polymer, a liquid metal oxide-based polymer is used to form a ceramic film by a condensation dehydration reaction. Ceramic particles obtained starting from such a liquid phase can be very small, ranging from a few Angstroms to tens of Angstroms. These small particles smooth and uneven the surface of the substrate, and the surface of the film is positively charged.
When an oil mist having a negative charge collides with the oil mist, the positive charge on the surface of the base is neutralized, and at the same time, the surface of the base becomes negatively charged by the oil mist having a further negative charge, and the oil mist is introduced. Repels and no longer adheres to the substrate.
Needless to say, the surface of the base may have a negative charge in advance by another method.
Alternatively, the substrate is assumed to have a positive charge or a negative charge in advance by any method, and this charge can be changed between a positive charge and a negative charge. First, an oil mist that is a negative charge as a positive charge Can be collected by + and-charges, and after collection, the substrate can be negatively charged so that the oil mist is repelled, separated from the substrate and collected and removed at once.
[0014]
Further, in the metal oxide-based polymer, when the metal element (Cu, Ag, Au) of the 1b group is present, the oil mist is subdivided and the above-mentioned phenomenon is further promoted, and the oil mist in the grease filter is deposited for a long time. Then, oxidation occurs, resulting in peroxides and radicals. In such a case, the group 1b metal element deactivates radicals generated from the peroxide generated from the substrate, so that there is no danger of ignition. The present invention has been completed by applying this function. Examples of the metal oxide polymer include an alkali metal, an organopoly metal, an organoalkoxy metal, an alkoxy metal, and a modified acetyl acetate metal.
[0015]
It was also found that the effect can be achieved even in the state of film formation on the entire filter skeleton or on a part of the collision side.
Although the present invention has been repeatedly studied for the purpose of a grease filter, it may be used for repelling and cleaning dust, exhaust gas and the like.
[0016]
The kitchen grease filter of the present invention has a bulk specific gravity of 0.3 to 0.7, preferably 0.4 to 0.5, and the number of holes is 6 to 20, particularly 9 to 13, per 25 mm of a straight line. Preferably, there is. Here, when the bulk specific gravity is smaller than 0.3, the skeleton is thin and lacks durability. On the other hand, if it is larger than 0.7, the rate of clogging increases, the pressure loss increases, and the suction noise increases, which may hinder the work.
Further, when the number of holes is 6 or less, the collision rate between the mist and the skeleton is small and the removal performance is inferior. When the number of holes is 20 or more, the pressure loss and suction noise increase, which may hinder workability. Furthermore, since an excessive amount of suction is given to the blower, a failure of the exhaust fan or the like is easily caused.
[0017]
In order to obtain the ceramic filter for a kitchen of the present invention, first, a ceramic filter is manufactured according to a conventional method, and then a film forming treatment is performed on the surface of the filter with a metal oxide polymer as described above.
In order to obtain a ceramic filter, a synthetic resin foam is used as a base material, and a ceramic powder such as alumina, mullite, cordierite, or a clay mineral such as Kibushi clay or kaolin is slurried and adhered thereto. The slurry can be removed, dried and fired. In this case, a flexible polyurethane foam having a reticulated skeleton without a cell membrane is preferably used as the synthetic resin foam.
[0018]
The slurry is prepared by adding a binder such as polyvinyl alcohol and CMC, a deflocculant such as Kevlario, water and the like in addition to the ceramic component, and adjusting the thixotropic performance of the slurry for adjusting the aperture. You can also.
The viscosity of the slurry can be adjusted by adjusting the amount of water added depending on the cell size or bulk specific gravity of the target ceramic filter, and it is usually desirable to adjust the viscosity to 120 to 160 poise.
A synthetic resin foam, for example, a polyurethane foam having a three-dimensional network skeleton structure without a cell membrane having 6 to 20 pores per 25 mm of straight line is immersed in the slurry, and the slurry is adhered to the slurry. The slurry is removed, and as the removing method, an appropriate method such as pressing with a roll, centrifugal separation, or air blowing can be adopted. Further, the slurry may be diluted as necessary, and the slurry may be applied on a substrate to which the slurry is attached by spraying or the like.
Next, after attaching the slurry, the slurry is dried and fired. The firing temperature is 1100 to 1400 ° C.
[0019]
The ceramic filter thus obtained is impregnated with the metal oxide-based polymer at a predetermined concentration with a diluent such as alcohol, and then dried at 80 to 150 ° C. after deposition to easily form a film. . Or you may apply to the skeleton surface using a spray. During drying, the metal oxide polymer undergoes a dehydration condensation reaction to form a film.
[0020]
【Example】
Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.
[Example 1]
A ceramic slurry having a viscosity of 160 poise was prepared by adding 80 parts of alumina, 20 parts of Kibushi clay, 4 parts of polyvinyl alcohol, and 0.1 part of Kevlario to 23 parts of water. This slurry was impregnated with a polyurethane foam having a three-dimensional network skeleton structure without a cell membrane of 245 × 495 × 25 mm having 10 cells per 25 mm of a straight line.
After the excess slurry was removed by a roll, the removed slurry was diluted to 30 poise, the skeleton surface was coated with a spray so that the coating ratio was 10% after impregnation, and dried at 60 ° C. for 16 hours. Next, firing was performed at 1200 ° C. to obtain a ceramic filter.
Then, an example of the present invention, that is, an 85% alcohol solution of an alkoxy metal containing Si and Al as a metal oxide-based polymer (ceramica G192 manufactured by Nippon Laboratories Co., Ltd.) was applied to the ceramic filter by spraying. Next, drying was performed at 120 ° C. for 3 hours to obtain a grease filter. The amount of adhesion was 2.7%.
[0021]
[Comparative Example 1]
In Comparative Example 1, as a precautionary measure, the ceramic filter obtained in the above-mentioned example was not subjected to a coating layer on the skin of the substrate with the metal oxide-based polymer of the present invention.
[0022]
[Comparative Example 2]
The ceramic filter of Comparative Example 1 was impregnated with an alumina glaze having a melting point of 1100 ° C., the excess slurry was removed by a centrifugal separator, dried at 60 ° C. for 8 hours, and then baked at 1150 ° C. The one which was not coated for forming a film with the metal oxide polymer of the invention was used. (JP-A-5-293319)
[0023]
Each filter obtained in the above Examples and Comparative Examples was subjected to an oil mist removal performance test, and the results are shown in Table 1.
[Table 1]

[0024]
【The invention's effect】
As described in detail above, by applying the metal oxide polymer of the present invention to the surface of the skeleton on a ceramic filter having a three-dimensional network skeleton structure, the grease filter performance is obtained by coating the collected oil mist with a conventional glaze. As described above, a grease filter having a reduced oil absorption rate and an excellent effect of a removal rate for more rapid removal was obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a ceramic filter of the present invention.
FIG. 2 is an enlarged view of a part of a porous ceramic body having a three-dimensional network skeleton structure for a grease filter used in the present invention.
FIG. 3 is a schematic view of an oil mist generator (front view).
FIG. 4 is a schematic view of an oil mist generator (side view).
FIG. 5 is a schematic cross-sectional view showing a conventional baffle-type kitchen grease filter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ceramic glister 2 Ceramic porous body 3 Stainless steel frame 4 Oil recovery hole 21 Oil mist generator 22 Grease filter 23 Duct 24 Water tank 25 Oil tank 26 Heater 27 Oil pan 28 Recovered oil distribution gutter 29 Recovered oil distribution pipe 30 Recovered oil distribution receiver 31 Blower

Claims (11)

A grease filter used for removal and recovery of oil mist generated in kitchens, machining, etc., characterized in that a coating layer is provided on the surface using a metal oxide polymer with a positive charge. Grease filter. The grease filter substrate is made by attaching a ceramic slurry to a synthetic resin foam having a three-dimensional network skeleton structure having an internal communication space, drying, and firing the ceramic slurry to obtain the entire skeleton surface or a part of the three-dimensional network ceramic porous body obtained. A grease filter, wherein a coating layer of the metal oxide polymer is provided in a portion. The grease filter according to claim 2, wherein the synthetic resin foam having a three-dimensional network skeleton structure having the internal space is polyurethane. The metal oxide-based polymer according to any one of claims 1 to 3, wherein the metal oxide-based polymer starts from a solution of the metal compound and turns the solution into a metal oxide polymer by condensation and polymerization of the compound in the solution. The grease filter as described. 5. The metal oxide-based polymer according to claim 1, wherein at least one of an alkali metal, an organopoly metal, an organoalkoxy metal, an alkoxy metal, and a modified acetyl acetate metal is used. The grease filter according to claim 1 or 2. The grease filter according to any one of claims 1 to 5, wherein the metal oxide-based polymer contains a Group 1b metal element. The grease filter base material is made by attaching a ceramic slurry to a synthetic resin foam having a three-dimensional network skeleton structure having an internal communication space, drying, and firing the entire surface or one skeleton of the three-dimensional network ceramic porous body obtained. A method for producing a grease filter, characterized in that a coating layer of the metal oxide polymer is provided in a portion , wherein the metal oxide polymer is dissolved in a solvent when forming the coating layer of the metal oxide polymer. A method for producing a grease filter, comprising: attaching a diluted solution to the entire or a part of the skeleton surface of the ceramic porous body having a three-dimensional network structure; and evaporating the solvent at 80 to 150 ° C. The method for producing a grease filter according to claim 7, wherein the synthetic resin foam having a three-dimensional network skeleton structure having the internal space is polyurethane. 9. The method for producing a grease filter according to claim 7, wherein the metal oxide-based polymer starts from a solution of the metal compound and turns the solution into a metal oxide polymer by condensation and polymerization of the compound in the solution. . 10. The metal oxide-based polymer according to claim 7, wherein at least one of an alkali metal, an organopoly metal, an organoalkoxy metal, an alkoxy metal, and a modified acetyl acetate metal is used. The method for producing a grease filter according to claim 1. The method for producing a grease filter according to any one of claims 7 to 10, wherein the metal oxide-based polymer contains a group 1b metal element.

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