JP4194012B2 - RESIN COMPOSITION FOR FOAM MOLDED BODY, FOAM MOLDED BODY, AND METHOD FOR PRODUCING THE SAME - Google Patents
RESIN COMPOSITION FOR FOAM MOLDED BODY, FOAM MOLDED BODY, AND METHOD FOR PRODUCING THE SAME Download PDFInfo
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- JP4194012B2 JP4194012B2 JP23838999A JP23838999A JP4194012B2 JP 4194012 B2 JP4194012 B2 JP 4194012B2 JP 23838999 A JP23838999 A JP 23838999A JP 23838999 A JP23838999 A JP 23838999A JP 4194012 B2 JP4194012 B2 JP 4194012B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Description
【０００１】
【発明の属する技術分野】
発泡成形体用樹脂組成物、特に、微生物を利用して汚水を処理する汚水処理装置に使用する流動床用微生物固定化担体や合併浄化槽用担体などとして好適な発泡成形体用樹脂組成物に関する。
【０００２】
【従来の技術】
汚水処理装置などの流動床生物処理装置は、微生物群（活性汚泥）を処理槽内の担体に固定化して、担体により汚水を濾過する、あるいは曝気操作により汚水と担体を流動化させるなどして汚水を浄化する。この微生物固定化用の担体は、微生物が付着しやすいように多孔質であり、流動に耐えるよう耐久性に優れることが要求される。
【０００３】
そこで、近年、耐久性に優れる合成樹脂を押し出し発泡などにより多孔質化させた担体の使用が急速に増加している。ところが、微生物固定化用の担体には、汚水に馴染んで均一に流動する流動性が要求されるが、従来単体に使用される樹脂は親水性が低く、水との馴染み性、ひいては流動性の点で問題があった。
【０００４】
【発明が解決しようとする課題】
本発明は、発泡成形体を形成した際に、安価で耐久性に優れ、更に廃棄処理時に周辺環境への悪影響が少なく、廃棄処理が容易であって、さらに親水性に優れて良好な流動性を有する発泡成形体用樹脂組成物、これを用いた発泡成形体およびその製造方法を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明は、ポリオレフィン系樹脂と、吸湿性物質と、グリセリン誘導体と、無機充填剤とから主としてなる発泡成形体用樹脂組成物、これを発泡成形させてなる発泡成形体、およびその製造方法である。
【０００６】
【発明の実施の形態】
以下に本発明を更に詳細に説明する。
本発明に使用するポリオレフィン系樹脂としては、特に限定されず、例えばポリエチレン系樹脂（低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレンなど）、ポリプロピレン系樹脂（アタクチックポリプロピレン、アイソタクチックポリプロピレンなどの非結晶性又は結晶性ポリプロピレン）、ポリ（４−メチルペンテン−１）、エチレン−プロピレン共重合体、エチレン−プロピレン−イソプチレン共重合体、アイオノマー、エチレン−（メタ）アクリル酸エステル共重合体（エチレン−アクリル酸エチル共重合体など）、エチレン−酢酸ビニル共重合体などが挙げられるが、好ましくはポリエチレン系樹脂が良い。また、上記ポリオレフィン系樹脂は、１種を単独で使用しても、２種以上を混合して使用しても良い。
【０００７】
本発明に使用する吸湿性物質は、特に限定されないが、好ましくは、水溶性高分子および／または水膨潤性高分子であるのが良い。また、上記吸湿性物質は、１種を単独で使用しても、２種以上を混合して使用しても良い。水溶性高分子あるいは水膨潤性高分子としては、セルロース（木粉、セルロース粉末など）、水溶性セルロース誘導体（メチルセルロース、エチルセルロース、ヒドロキシエチルセルロースなど）、カルボキシル基含有水溶性高分子（カルボキシメチルセルロース、ポリアクリル酸、ポリメタクリル酸、（メタ）アクリル酸エステル−（メタ）アクリル酸共重合体、スチレン−（メタ）アクリル酸共重合体、スチレン−無水マレイン酸共重合体、ビニルエーテル−無水マレイン酸共重合体、またはこれらの塩など）、水溶性ビニルポリマー（ポリビニルアルコール、ポリビニルエーテル、ポリビニルピロリドン、ポリアクリルアミドなど）、水溶性ポリアルキレンオキサイド（ポリエチレングリコール、ポリエチレンオキサイド−ポリプロピレンオキサイドブロック共重合体など）、吸水性ポリマー（架橋ポリアクリル酸、澱粉−アクリル酸グラフト共重合体、イソブチレン−無水マレイン酸共重合体架橋物、架橋ポリエチレンオキサイド、またはこれらの塩など）が挙げられる。前記の塩としては例えば有機塩基、無機塩基が挙げられる。これらは、１種を単独で使用しても、２種以上を混合して使用しても良い。本発明において、好ましくは、セルロース、ポリビニルアルコールを用いるのが良い。
【０００８】
本発明に使用するグリセリン誘導体は、特に限定されず、グリセリンモノステアレート、グリセリンモノカプリレート、グリセリンモノラウレート、グリセリンモノパルミテート、グリセリンモノオレエート、グリセリンモノベヘネートなどが挙げられるが、好ましくはグリセリンモノステアレートが良い。また、これらは１種を単独で使用しても、２種以上を混合して使用しても良い。
【０００９】
本発明に使用する無機充填剤としては、特に限定されず、炭酸カルシウム、炭酸マグネシウム、酸化亜鉛、酸化チタン、水酸化アルミニウム、硫酸バリウム、シリカ、アルミナ、タルク、ゼオライト、チタン酸カリウムなどが挙げられるが、好ましくはタルクが良い。また、これらは１種を単独で使用しても、２種以上を混合して使用しても良い。
【００１０】
本発明において、上記各成分（ポリオレフィン系樹脂、吸湿性物質、グリセリン誘導体、無機充填剤）の配合割合は、特に限定はなく、形成する発泡成形体の親水性などの所望の性質に応じて適宜設定すれば良いがポリオレフィン系樹脂１００重量部に対し、好ましくは吸湿性物質が１〜１０重量部、グリセリン誘導体が１〜１０重量部、無機充填剤が２〜４０重量部であるのが良い。吸湿性物質およびグリセリン誘導体の配合量が上記範囲より少ないと、親水性が低下し、本発明の樹脂組成物より形成した発泡成形体の水中での流動性が低下する。吸湿性物質およびグリセリン誘導体の配合量が上記範囲より多い場合には、本発明の樹脂組成物より形成した発泡成形体の機械的強度や均一性が低下しやすい。また、充填剤の配合量が上記範囲より少ないと、本発明の樹脂組成物より形成した発泡成形体の水中での流動性が低下する。充填剤の配合量が上記範囲より多いと、本発明の樹脂組成物より形成した発泡成形体の機械強度が低下し、また発泡成形体を成形する際の安定性が低下する。
【００１１】
本発明の発泡成形体用樹脂組成物は、上記各成分の他、必要に応じて本発明の作用を阻害しない範囲で添加剤などの他の成分を含有していても良い。
【００１２】
本発明の発泡成形体用樹脂組成物は、発泡成形させることにより、発泡成形体を形成できる。該発泡成形体は、ポリオレフィン系樹脂を使用しているために安価で耐久性に優れ、更に廃棄処理時に周辺環境への悪影響が少なく、廃棄処理が容易である。さらに、吸湿性物質およびグリセリン誘導体を含有するために、親水性に優れて、良好な流動性を有する。従って、特に、流動床や合併浄化槽などの微生物を利用して汚水を処理する汚水処理装置に用いる微生物固定化用の担体として好適に使用できる。
【００１３】
本発明の発泡成形体は、内部に連続気泡を有し、該連続気泡が、連続気泡内面の２ヶ所以上が発泡成形体表面に連通する貫通気泡と、連続気泡内面の１ヶ所のみが発泡成形体表面に連通する半貫通気泡とからなり、かつ発泡成形体の全容積中における前記連続気泡の容積の占有割合が１５％以下であるのが好ましい。連続気泡の容積の占有割合が１５％を超えると、本発明の樹脂組成物より形成した発泡成形体の強度が低下する。また、上記連続気泡中の貫通気泡と半貫通気泡の割合は特に限定されない。
【００１４】
本発明の発泡成形体の密度（気泡分を除外した樹脂組成物の密度）および発泡倍率は、特に限定されず、発泡成形体の所望のサイズ、性質などに応じて適宜設定すれば良い。
【００１５】
本発明の発泡成形体のサイズ、全体形状は、特に限定されず、形状としては例えば円柱状、楕円柱状、円筒状、楕円筒状、角柱状などが挙げられる。
【００１６】
本発明の発泡成形体の製造方法は、通常一般の発泡成形体の製造方法を用いることができるが、好ましくは上記発泡成形体用樹脂組成物に発泡剤を配合し、発泡成形させるのが好ましい。成形方法としては、押し出し成形方法が好ましく用いられる。
【００１７】
本発明の発泡成形体の形成に使用される発泡剤としては、特に限定されず、例えば、プロパン、ブタン、ペンタン、ヘキサン、シクロヘキサンなどの炭化水素類、ＨＦＣ−１３４ａ、ＨＣＦＣ−１４２ａ、ＨＣＦＣ−２２、１，１，１，２−テトラフルオロエタン、ジクロロメタンなどのハロゲン化炭化水素、メチルエーテル、エチルエーテルなどのエーテル類、アセトンなどのケトン類、炭酸ガス、窒素ガスなどの揮発型発泡剤、炭酸アンモニウム、炭酸ナトリウムなどのアルカリ金属炭酸塩、炭酸水素アンモニウム、炭酸水素ナトリウムなどのアルカリ金属の炭酸水素塩、アゾ化合物、スルホニルヒドラジド化合物、セミカルバジド化合物、ニトロソ化合物、アジド化合物などの分解性発泡剤が挙げられる。これらの発泡剤は１種または２種以上混合して使用できる。分解性発泡剤は、その種類に応じて発泡助剤と組み合わせて使用しても良い。例えば前記の炭酸塩や炭酸水素塩は、発泡助剤として、有機酸（例えば、クエン酸、シュウ酸などのように、前記の炭酸塩や炭酸水素塩よりも酸性度が大きい有機酸）もしくはその塩と組み合せて使用できる。また、ニトロソ化合物は、発泡助剤として前記有機酸や尿素などと組み合わせて使用できる。前記有機酸は無水物であっても、水和物であっても良い。
【００１８】
本発明においては、上記発泡剤のうち、炭酸アンモニウム、アルカリ金属炭酸塩、炭酸水素アンモニウム、アルカリ金属炭酸水素塩から選ばれる１種以上の分解型発泡剤、および有機酸とから主としてなる発泡剤、あるいは沸点−５０〜７０℃の揮発性型発泡剤が、好ましく用いられる。
【００１９】
本発明において、発泡剤の配合量は特に限定されず、使用する発泡剤の種類、所望の発泡倍率などに応じて適宜設定すれば良いが、好ましくは上記ポリオレフィン系樹脂の総量１００重量部に対して１〜３０重量部を使用するのが良い。
【００２０】
本発明の発泡成形体においては、核剤を使用することができる。核材の使用量は、特に限定されないが、ポリオレフィン系樹脂の総量１００重量部に対して、核剤０．１〜５重量部を配合するのが好ましい。
【００２１】
また、上記核剤としては、例えば炭酸カルシウム、炭酸マグネシウム、酸化亜鉛、酸化チタン、水酸化アルミニウム、硫酸バリウム、シリカ、アルミナ、タルク、ゼオライト、チタン酸カリウムなどが挙げられる。
【００２２】
本発明の発泡成形体の成形においては、押し出しなどの成形条件は特に限定されない。また、上記各成分の配合方法も限定されず、成形時に同時あるいは順次各成分を配合し、加熱溶融混合などにより混合される。混合方法は通常一般に使用される攪拌機などを使用できる。また、各成分を混合後、ペレット状などの所望の形状に成形した後、発泡成形しても良い。
【００２３】
以下、試験例および実施例を用いて本発明を更に詳細に説明するが、本発明はこれらに限定されるものではない。
試験例
１．試験方法
（１）親水性（沈降率）
実施例１〜３、比較例１、２の発泡成形体を、流動していない水面上に静置し、そのまま放置して１００時間後の発泡成形体の水面下への沈降率を測定し、親水性を判断した。沈降率は、横方向から観察し、発泡成形体の投影面積全体に対する、水面下に沈降した分の投影面積の割合を算出して求めた。
【００２４】
（２）流動性
実施例１〜３、比較例１、２の発泡成形体０．４リットル分と、４リットルの水を、２０ｃｍ×２０ｃｍ、高さ４０ｃｍの水槽中に入れ、水槽の底部より、空気を毎分３リットルの割合で曝気を行い、２週間以内に均一に流動した場合を○、２週間以内に流動しない、あるいは均一に流動しない場合を×として流動性を評価した。
【００２５】
２．試験結果
上記試験（１）、（２）の結果を表１に示す。
【００２６】
【実施例】
実施例１〜３、比較例１、２
下記に示す材料を用い、表１に示す配合割合で各成分、および発泡剤としてブタンを表１に示す割合で混合して押し出し成形し、円柱状の、連続気泡の容積割合が発泡成形体の全容積に対し表１の割合となるような発泡成形体を製造した。
【００２７】
【表１】
【発明の効果】
本発明の発泡成形体用樹脂組成物を用いて成形した発泡成形体は、安価で耐久性に優れ、更に廃棄処理時に周辺環境への悪影響が少なく、廃棄処理が容易である。その上、親水性に優れて、良好な流動性を有し、特に、流動床や合併浄化槽などの微生物を利用して汚水を処理する汚水処理装置に用いる微生物固定化用の担体として好適である。[0001]
BACKGROUND OF THE INVENTION
More particularly, the present invention relates to a resin composition for foam molded articles suitable as a microorganism-immobilized carrier for fluidized beds or a carrier for combined septic tanks used in a sewage treatment apparatus that treats sewage using microorganisms.
[0002]
[Prior art]
A fluidized bed biological treatment device such as a sewage treatment device immobilizes a microorganism group (activated sludge) on a carrier in a treatment tank and filters the sewage by the carrier, or fluidizes the sewage and the carrier by an aeration operation. Purify sewage. This carrier for immobilizing microorganisms is required to be porous so that microorganisms can easily adhere to it, and to be excellent in durability so as to withstand flow.
[0003]
Therefore, in recent years, the use of a support made by extruding a synthetic resin having excellent durability and making it porous by foaming or the like is rapidly increasing. However, the carrier for immobilizing microorganisms is required to have a fluidity that flows uniformly by adhering to sewage. However, conventional resins used for simple substances have low hydrophilicity, and are compatible with water, and thus have fluidity. There was a problem in terms.
[0004]
[Problems to be solved by the invention]
The present invention is inexpensive and has excellent durability when formed into a foamed molded article, and has little adverse effect on the surrounding environment during disposal, is easy to dispose of, and has excellent hydrophilicity and good fluidity. It aims at providing the resin composition for foaming moldings which has, a foaming molding using the same, and its manufacturing method.
[0005]
[Means for Solving the Problems]
The present invention relates to a resin composition for a foam molded article mainly composed of a polyolefin-based resin, a hygroscopic substance, a glycerin derivative, and an inorganic filler, a foam molded article obtained by subjecting this to foam molding, and a method for producing the same. .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in further detail below.
The polyolefin resin used in the present invention is not particularly limited, and examples thereof include non-polyethylene resins (low density polyethylene, medium density polyethylene, high density polyethylene, etc.), polypropylene resins (atactic polypropylene, isotactic polypropylene, etc.). Crystalline or crystalline polypropylene), poly (4-methylpentene-1), ethylene-propylene copolymer, ethylene-propylene-isobutylene copolymer, ionomer, ethylene- (meth) acrylate copolymer (ethylene- Ethyl acrylate copolymer, etc.), ethylene-vinyl acetate copolymer, and the like, and polyethylene resin is preferable. Moreover, the said polyolefin resin may be used individually by 1 type, or may mix and use 2 or more types.
[0007]
The hygroscopic substance used in the present invention is not particularly limited, but is preferably a water-soluble polymer and / or a water-swellable polymer. Moreover, the said hygroscopic substance may be used individually by 1 type, or may mix and use 2 or more types. Examples of water-soluble polymers or water-swellable polymers include cellulose (wood flour, cellulose powder, etc.), water-soluble cellulose derivatives (methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, etc.), and carboxyl group-containing water-soluble polymers (carboxymethyl cellulose, polyacrylic). Acid, polymethacrylic acid, (meth) acrylic acid ester- (meth) acrylic acid copolymer, styrene- (meth) acrylic acid copolymer, styrene-maleic anhydride copolymer, vinyl ether-maleic anhydride copolymer Or a salt thereof), a water-soluble vinyl polymer (polyvinyl alcohol, polyvinyl ether, polyvinylpyrrolidone, polyacrylamide, etc.), a water-soluble polyalkylene oxide (polyethylene glycol, polyethylene oxide-polypropylene). Oxide block copolymer), water-absorbing polymer (crosslinked polyacrylic acid, starch-acrylic acid graft copolymer, isobutylene-maleic anhydride copolymer cross-linked product, cross-linked polyethylene oxide, or salts thereof) It is done. Examples of the salt include organic bases and inorganic bases. These may be used alone or in combination of two or more. In the present invention, it is preferable to use cellulose or polyvinyl alcohol.
[0008]
The glycerol derivative used in the present invention is not particularly limited, and examples thereof include glycerol monostearate, glycerol monocaprylate, glycerol monolaurate, glycerol monopalmitate, glycerol monooleate, and glycerol monobehenate. Glycerol monostearate is good. Moreover, these may be used individually by 1 type, or may mix and use 2 or more types.
[0009]
The inorganic filler used in the present invention is not particularly limited, and examples thereof include calcium carbonate, magnesium carbonate, zinc oxide, titanium oxide, aluminum hydroxide, barium sulfate, silica, alumina, talc, zeolite, and potassium titanate. However, talc is preferable. Moreover, these may be used individually by 1 type, or may mix and use 2 or more types.
[0010]
In the present invention, the blending ratio of each of the above components (polyolefin resin, hygroscopic substance, glycerin derivative, inorganic filler) is not particularly limited, and is appropriately determined according to desired properties such as the hydrophilicity of the foamed molded product to be formed. The hygroscopic substance is preferably 1 to 10 parts by weight, the glycerin derivative is 1 to 10 parts by weight, and the inorganic filler is 2 to 40 parts by weight with respect to 100 parts by weight of the polyolefin resin. When the blending amount of the hygroscopic substance and the glycerin derivative is less than the above range, the hydrophilicity is lowered, and the fluidity in water of the foamed molded body formed from the resin composition of the present invention is lowered. When the amount of the hygroscopic substance and the glycerin derivative is more than the above range, the mechanical strength and uniformity of the foamed molded body formed from the resin composition of the present invention are likely to be lowered. Moreover, when the compounding quantity of a filler is less than the said range, the fluidity | liquidity in the water of the foaming molding formed from the resin composition of this invention will fall. When the blending amount of the filler is larger than the above range, the mechanical strength of the foam molded article formed from the resin composition of the present invention is lowered, and the stability when molding the foam molded article is lowered.
[0011]
The resin composition for a foam-molded article of the present invention may contain other components such as additives within the range not impairing the action of the present invention, if necessary, in addition to the above-described components.
[0012]
The foamed molded product can be formed by subjecting the resin composition for foamed molded product of the present invention to foam molding. Since the foamed molded article uses a polyolefin-based resin, it is inexpensive and excellent in durability, and has a small adverse effect on the surrounding environment at the time of disposal, and is easy to discard. Furthermore, since it contains a hygroscopic substance and a glycerin derivative, it has excellent hydrophilicity and good fluidity. Therefore, in particular, it can be suitably used as a carrier for immobilizing microorganisms used in a sewage treatment apparatus that treats sewage using microorganisms such as a fluidized bed or a combined septic tank.
[0013]
The foamed molded product of the present invention has open cells inside, and the open cells are formed by through-bubbles in which two or more inner surfaces of the open cells communicate with the surface of the foamed molded product, and only one portion of the inner surface of the open cells is foam-molded. It is preferable that the occupying ratio of the volume of the open cell is 15% or less in the total volume of the foamed molded body. When the occupation ratio of the volume of open cells exceeds 15%, the strength of the foamed molded body formed from the resin composition of the present invention is lowered. Moreover, the ratio of the penetrating bubble and the semi-penetrating bubble in the open cell is not particularly limited.
[0014]
The density of the foamed molded product of the present invention (density of the resin composition excluding air bubbles) and the expansion ratio are not particularly limited, and may be set as appropriate according to the desired size and properties of the foamed molded product.
[0015]
The size and overall shape of the foamed molded product of the present invention are not particularly limited, and examples of the shape include a columnar shape, an elliptical columnar shape, a cylindrical shape, an elliptical cylindrical shape, and a prismatic shape.
[0016]
As the method for producing a foamed molded product of the present invention, a general method for producing a foamed molded product can be used. Preferably, a foaming agent is added to the resin composition for foamed molded product, and foam molding is preferably performed. . As the molding method, an extrusion molding method is preferably used.
[0017]
The foaming agent used for forming the foamed molded article of the present invention is not particularly limited, and examples thereof include hydrocarbons such as propane, butane, pentane, hexane, and cyclohexane, HFC-134a, HCFC-142a, and HCFC-22. 1,1,1,2-tetrafluoroethane, halogenated hydrocarbons such as dichloromethane, ethers such as methyl ether and ethyl ether, ketones such as acetone, volatile blowing agents such as carbon dioxide and nitrogen gas, carbonic acid Degradable foaming agents such as alkali metal carbonates such as ammonium and sodium carbonate, alkali metal hydrogen carbonates such as ammonium hydrogen carbonate and sodium hydrogen carbonate, azo compounds, sulfonyl hydrazide compounds, semicarbazide compounds, nitroso compounds and azide compounds It is done. These foaming agents can be used alone or in combination. The degradable foaming agent may be used in combination with a foaming aid depending on the type. For example, the carbonate or hydrogen carbonate is an organic acid (for example, an organic acid having a higher acidity than the carbonate or hydrogen carbonate, such as citric acid or oxalic acid) or a foaming aid. Can be used in combination with salt. Moreover, a nitroso compound can be used in combination with the said organic acid, urea, etc. as a foaming adjuvant. The organic acid may be an anhydride or a hydrate.
[0018]
In the present invention, among the above foaming agents, one or more decomposable foaming agents selected from ammonium carbonate, alkali metal carbonate, ammonium hydrogen carbonate, alkali metal hydrogen carbonate, and a foaming agent mainly composed of an organic acid, Alternatively, a volatile foaming agent having a boiling point of −50 to 70 ° C. is preferably used.
[0019]
In the present invention, the blending amount of the foaming agent is not particularly limited, and may be appropriately set according to the type of foaming agent to be used, the desired foaming ratio, etc., but is preferably based on 100 parts by weight of the total amount of the polyolefin resin. 1 to 30 parts by weight may be used.
[0020]
A nucleating agent can be used in the foamed molded product of the present invention. Although the usage-amount of a nuclear material is not specifically limited, It is preferable to mix | blend a nucleating agent 0.1-5 weight part with respect to 100 weight part of total amounts of polyolefin resin.
[0021]
Examples of the nucleating agent include calcium carbonate, magnesium carbonate, zinc oxide, titanium oxide, aluminum hydroxide, barium sulfate, silica, alumina, talc, zeolite, and potassium titanate.
[0022]
In the molding of the foamed molded article of the present invention, molding conditions such as extrusion are not particularly limited. Also, the blending method of the above components is not limited, and the respective components are blended simultaneously or sequentially at the time of molding and mixed by heating, melting and mixing. As a mixing method, a generally used stirrer or the like can be used. Moreover, after mixing each component, after shape | molding in desired shapes, such as a pellet form, you may carry out foam molding.
[0023]
EXAMPLES Hereinafter, although this invention is demonstrated further in detail using a test example and an Example, this invention is not limited to these.
Test Example 1 Test method (1) Hydrophilicity (sedimentation rate)
The foamed molded products of Examples 1 to 3 and Comparative Examples 1 and 2 were allowed to stand on the non-flowing water surface, and left as they were to measure the sedimentation rate of the foamed molded product after 100 hours under the water surface, The hydrophilicity was judged. The sedimentation rate was determined by observing from the lateral direction and calculating the ratio of the projected area of the part that was submerged below the water surface to the entire projected area of the foamed molded product.
[0024]
(2) Fluidity 0.4 liters of foamed molded products of Examples 1 to 3 and Comparative Examples 1 and 2 and 4 liters of water are placed in a 20 cm × 20 cm, 40 cm high water tank, from the bottom of the water tank The air was aerated at a rate of 3 liters per minute, and the fluidity was evaluated as ◯ when it flowed uniformly within 2 weeks, or x when it did not flow within 2 weeks, or when it did not flow uniformly.
[0025]
2. Test results Table 1 shows the results of the tests (1) and (2).
[0026]
【Example】
Examples 1 to 3, Comparative Examples 1 and 2
Using the materials shown below, each component and butane as a foaming agent were mixed at the ratio shown in Table 1 and extruded at a ratio shown in Table 1, and the volume ratio of the columnar, open cells was that of the foam molded body. A foam molded article having a ratio shown in Table 1 with respect to the total volume was produced.
[0027]
[Table 1]
【The invention's effect】
The foamed molded product molded using the resin composition for foamed molded product of the present invention is inexpensive and excellent in durability, has little adverse effect on the surrounding environment during disposal, and is easy to discard. In addition, it has excellent hydrophilicity and good fluidity, and is particularly suitable as a carrier for immobilizing microorganisms used in a sewage treatment apparatus that treats sewage using microorganisms such as a fluidized bed and a combined septic tank.
Claims (11)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23838999A JP4194012B2 (en) | 1999-08-25 | 1999-08-25 | RESIN COMPOSITION FOR FOAM MOLDED BODY, FOAM MOLDED BODY, AND METHOD FOR PRODUCING THE SAME |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23838999A JP4194012B2 (en) | 1999-08-25 | 1999-08-25 | RESIN COMPOSITION FOR FOAM MOLDED BODY, FOAM MOLDED BODY, AND METHOD FOR PRODUCING THE SAME |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001064427A JP2001064427A (en) | 2001-03-13 |
| JP4194012B2 true JP4194012B2 (en) | 2008-12-10 |
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| JP23838999A Expired - Fee Related JP4194012B2 (en) | 1999-08-25 | 1999-08-25 | RESIN COMPOSITION FOR FOAM MOLDED BODY, FOAM MOLDED BODY, AND METHOD FOR PRODUCING THE SAME |
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| JP (1) | JP4194012B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002275301A (en) * | 2001-03-21 | 2002-09-25 | Sanwa Kako Co Ltd | Manufacturing method of crosslinked polyethylene-open cell foam |
| JP4530320B2 (en) * | 2001-05-22 | 2010-08-25 | 三菱レイヨン株式会社 | Microorganism immobilization carrier |
| JP2003230892A (en) * | 2001-12-03 | 2003-08-19 | Nisshinbo Ind Inc | Chemical-resistant carrier for bioreactor, method for manufacturing the same and method for using the carrier |
| JP2007020437A (en) * | 2005-07-13 | 2007-02-01 | Hitachi Plant Technologies Ltd | Integrally immobilizing carrier and method for producing the same |
| JP5650373B2 (en) * | 2007-08-23 | 2015-01-07 | 日清紡ホールディングス株式会社 | Method for manufacturing fluid processing carrier |
| JP5309048B2 (en) * | 2009-03-25 | 2013-10-09 | ローム アンド ハース カンパニー | Composition for producing porous EVA coating film |
| US20200017665A1 (en) * | 2018-07-10 | 2020-01-16 | Nano And Advanced Materials Institute Limited | Germ-repellent material |
| CN112939205B (en) * | 2021-04-27 | 2023-04-21 | 上海同澜生态环境科技有限公司 | Method for denitrification and dephosphorization of urban sewage by adopting three-phase fluidized bed with honeycomb filler |
| CN115124787B (en) * | 2022-08-30 | 2022-11-25 | 江苏中科聚合新材料产业技术研究院有限公司 | Modified polypropylene foam material and preparation method and application thereof |
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