JP2010179222A - Mat for oil adsorption - Google Patents
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- JP2010179222A JP2010179222A JP2009023823A JP2009023823A JP2010179222A JP 2010179222 A JP2010179222 A JP 2010179222A JP 2009023823 A JP2009023823 A JP 2009023823A JP 2009023823 A JP2009023823 A JP 2009023823A JP 2010179222 A JP2010179222 A JP 2010179222A
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- oil
- nonwoven fabric
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- fiber nonwoven
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 56
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 49
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 8
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 8
- 229920000642 polymer Polymers 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 14
- 239000004743 Polypropylene Substances 0.000 abstract description 4
- -1 polypropylene Polymers 0.000 abstract description 4
- 239000002689 soil Substances 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 35
- 238000000034 method Methods 0.000 description 14
- 239000004744 fabric Substances 0.000 description 11
- 239000004750 melt-blown nonwoven Substances 0.000 description 10
- 239000012510 hollow fiber Substances 0.000 description 8
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 2
- 229920001384 propylene homopolymer Polymers 0.000 description 2
- 229920005604 random copolymer Polymers 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 241000195940 Bryophyta Species 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000000783 alginic acid Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- HJUFTIJOISQSKQ-UHFFFAOYSA-N fenoxycarb Chemical compound C1=CC(OCCNC(=O)OCC)=CC=C1OC1=CC=CC=C1 HJUFTIJOISQSKQ-UHFFFAOYSA-N 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000008206 lipophilic material Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000011929 mousse Nutrition 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005594 polymer fiber Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Landscapes
- Nonwoven Fabrics (AREA)
- Removal Of Floating Material (AREA)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
本発明は、油や汚水等の漏洩や流出による海洋、河川、湖沼等の汚染、又は、工場内の油や汚水洩れ等を吸着回収、又は拭き取ることによって処理するのに好適な油吸着用マットに関する。 The present invention is an oil adsorption mat that is suitable for treating by collecting or wiping off oil, sewage leakage, etc. in the ocean, rivers, lakes, etc. due to leakage or spillage of oil or sewage, etc. About.
海面や水面に流出した油の流出事故防止対策として従来は、オイルフェンスで流出油を囲み、その中にポリプロピレン製不織布等の親油性素材よりなるマット状の油吸着材を投入して油を吸着することにより流出油を回収する方法が多用されている。ポリプロピレン製不織布の浮力を増す方法として、中空繊維よりなるネットの周縁をシール状にする方法、さらには、中空繊維よりなるネットと中空糸を使用した織布又は不織布と積層してなる方法（特開平１０−２９６２４１号公報：特許文献１）が提案されている。
しかしながら、かかる方法で得られる油吸着用マットは、高粘度油やムース状になった油の吸着には適しているが、粘度が低い油の回収には適していない。また、流出油を吸収した後の不織布が黒色を帯びるため、海面上での判別が難しく回収時の効率が低いという問題もある。
Conventionally, as a measure to prevent spills of oil spilled on the sea surface or water surface, oil spills are enclosed by an oil fence, and matte oil adsorbents made of lipophilic materials such as polypropylene nonwoven fabric are put in it to absorb the oil. Thus, a method for recovering the spilled oil is frequently used. As a method for increasing the buoyancy of a polypropylene non-woven fabric, a method in which the periphery of a net made of hollow fibers is sealed, and a method in which a net made of hollow fibers and a woven fabric or non-woven fabric using hollow fibers are laminated (specialized) Japanese Patent Laid-Open No. 10-296241: Patent Document 1) has been proposed.
However, the oil adsorption mat obtained by such a method is suitable for adsorption of high-viscosity oil or mousse oil, but is not suitable for recovery of oil having low viscosity. In addition, since the nonwoven fabric after absorbing the spilled oil is black, there is also a problem that it is difficult to distinguish on the sea surface and the efficiency at the time of recovery is low.
本発明は、従来のポリプロピレン製不織布からなる油吸着用マットに比べ、浮力及び油吸着量が多い油吸着用マットを得ることを目的とし、種々検討した結果、油吸着用マットを形成する長繊維不織布として、中空率が高い中空長繊維とすることにより、本発明の目的を達成し得ることを見出した。 The present invention has an object to obtain an oil-adsorbing mat having a higher buoyancy and oil-absorbing amount than a conventional oil-adsorbing mat made of polypropylene nonwoven fabric. As a result of various studies, long fibers forming an oil-adsorbing mat are disclosed. It has been found that the object of the present invention can be achieved by using a hollow long fiber having a high hollow ratio as the nonwoven fabric.
本発明は、繊維径が１０〜１００μｍ、中空率が１０〜５０％の中空断面を有するプロピレン系重合体の中空長繊維不織布からなる油吸着用マットを提供するものである。 The present invention provides an oil-adsorbing mat comprising a hollow long fiber nonwoven fabric of a propylene polymer having a hollow cross section with a fiber diameter of 10 to 100 μm and a hollow ratio of 10 to 50%.
本発明の油吸着用マットは、油吸着性に優れており、しかも、海面や水面に流出した油を吸着した後も浮力を失うことなく、且つ、油を吸着した後も白さを保つことから、油を吸着したマットの回収作業が容易である。 The oil adsorbing mat of the present invention is excellent in oil adsorbing property, and does not lose buoyancy even after adsorbing oil spilled on the sea surface or water surface, and keeps whiteness even after adsorbing oil. Therefore, it is easy to collect the mat that has adsorbed oil.
＜プロピレン系重合体＞
本発明に係る中空長繊維不織布を形成するプロピレン系重合体は、通常、メルトフローレート（ＭＦＲ）（ＡＳＴＭ Ｄ−１２３８、２３０℃、荷重２１６０ｇ）が１０〜１００ｇ／１０分、好ましくは１０〜７０ｇ／１０分の範囲にある。ＭＦＲが１０ｇ／１０分未満のプロピレン系重合体は、溶融粘度が高く紡糸性に劣るので、中空率が高い細繊維を得ることは困難となる虞があり、一方、１００ｇ／１０分を超えるプロピレン系重合体は、得られる長繊維不織布の引張強度等が劣る虞がある。
<Propylene-based polymer>
The propylene-based polymer forming the hollow long fiber nonwoven fabric according to the present invention usually has a melt flow rate (MFR) (ASTM D-1238, 230 ° C., load 2160 g) of 10 to 100 g / 10 minutes, preferably 10 to 70 g. / 10 min. Propylene polymers having an MFR of less than 10 g / 10 min have a high melt viscosity and poor spinnability, so it may be difficult to obtain fine fibers having a high hollow ratio, while propylene exceeding 100 g / 10 min. There is a possibility that the tensile strength of the obtained long fiber nonwoven fabric is inferior in the polymer.
本発明に係るプロピレン系重合体は、プロピレンの単独重合体及びプロピレンとエチレン、１−ブテン、１−ペンテン、１−ヘキセン、１−オクテン、４−メチル−１−ペンテン等の炭素数２以上、好ましくは２〜８の１種または２種以上のα−オレフィンとのランダム共重合体（プロピレン・α―オレフィンランダム共重合体）であり、通常、融点（Ｔｍ）が１３５℃以上、好ましくは１３５〜１６５℃の範囲にある。α−オレフィンの共重合量は、得られるプロピレン系重合体の融点（Ｔｍ）が上記範囲にある限り特に限定はされないが、通常、１０モル％以下、好ましくは６モル％以下である。 The propylene-based polymer according to the present invention is a propylene homopolymer and two or more carbon atoms such as propylene and ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, Preferably, it is a random copolymer (propylene / α-olefin random copolymer) with one or more α-olefins of 2 to 8, usually having a melting point (Tm) of 135 ° C. or higher, preferably 135. It is in the range of ˜165 ° C. The copolymerization amount of the α-olefin is not particularly limited as long as the melting point (Tm) of the obtained propylene polymer is in the above range, but is usually 10 mol% or less, preferably 6 mol% or less.
本発明に係るプロピレン系重合体には、本発明の目的を損なわない範囲で、通常用いられる酸化防止剤、耐候安定剤、耐光安定剤、帯電防止剤、防曇剤、ブロッキング防止剤、滑剤、核剤、顔料等の添加剤或いは他の重合体を必要に応じて配合することができる。 In the propylene polymer according to the present invention, the antioxidant, weathering stabilizer, light stabilizer, antistatic agent, antifogging agent, antiblocking agent, lubricant, which are usually used within the range not impairing the object of the present invention, Additives such as nucleating agents and pigments or other polymers can be blended as necessary.
＜中空長繊維不織布＞
本発明の油吸着用マットを形成する中空長繊維不織布は、繊維径が１０〜１００μｍ、好ましくは２０〜５０μｍ、中空率が１０〜５０％、好ましくは１０〜３０％の中空断面を有するプロピレン系重合体の中空長繊維から形成される不織布である。繊維径が１０μｍ未満の中空繊維からなる不織布は、成形上中空率１０％の確保が困難であり、繊維径が１００μｍを超える中空繊維からなる不織布は、目的とする油吸着性能が低下及びまたはマットとしての強度低下の虞がある。中空率が１０％未満の中空繊維からなる不織布は、使用時の浮力が改善されず、中空率が５０％を超える中空繊維からなる不織布は、成形が困難の虞がある。
本発明に係る中空長繊維不織布は、好ましくは目付が３０〜１０００ｇ／ｍ2、より好ましくは１００〜５００ｇ／ｍ2、好ましくは厚さが０．３〜１５ｍｍ、より好ましくは1〜１０ｍｍの範囲にある。目付及び厚さを上記範囲にすることにより、吸油性能に優れる油吸着用マットが得られる。
本発明に係る中空長繊維不織布は、通常、ニードルパンチにより中空長繊維が交絡されている。
<Hollow long fiber nonwoven fabric>
The hollow long fiber nonwoven fabric forming the mat for oil adsorption of the present invention has a fiber diameter of 10 to 100 μm, preferably 20 to 50 μm, a hollow ratio of 10 to 50%, preferably 10 to 30%, and a propylene-based hollow cross section It is a nonwoven fabric formed from hollow polymer fibers. A nonwoven fabric made of hollow fibers having a fiber diameter of less than 10 μm is difficult to ensure a hollow ratio of 10% in molding, and a nonwoven fabric made of hollow fibers having a fiber diameter of more than 100 μm has a reduced target oil adsorption performance and / or a mat. There is a risk of a decrease in strength. A non-woven fabric made of hollow fibers having a hollow ratio of less than 10% does not improve buoyancy during use, and a non-woven cloth made of hollow fibers having a hollow ratio of more than 50% may be difficult to mold.
The hollow long fiber nonwoven fabric according to the present invention preferably has a basis weight of 30 to 1000 g / m 2 , more preferably 100 to 500 g / m 2 , preferably a thickness of 0.3 to 15 mm, more preferably 1 to 10 mm. It is in. By setting the basis weight and thickness within the above ranges, an oil adsorption mat having excellent oil absorption performance can be obtained.
In the hollow long fiber nonwoven fabric according to the present invention, the hollow long fibers are usually entangled by needle punching.
＜中空長繊維不織布の製造方法＞
本発明の中空長繊維不織布は、前記プロピレン系重合体を用いて公知のスパンボンド不織布の製造方法により製造し得る。
<Method for producing hollow long fiber nonwoven fabric>
The hollow long fiber nonwoven fabric of the present invention can be produced by a known method for producing a spunbond nonwoven fabric using the propylene polymer.
＜油吸着用マット＞
本発明の油吸着用マットは、前記中空長繊維不織布からなる。本発明の油吸着用マットは、ロール状、シート状、リボン状などに限らず、使用形態に応じて、種々の形状を採り得る。
本発明の油吸着用マットは、単一で使用してもよいし、繊維径が１０μｍ未満のプロピレン系重合体の中実繊維あるいは中空繊維からなるメルトブローン不織布と積層して用いてもよい。メルトブローン不織布と積層する場合は、例えば、中空長繊維不織布／メルトブローン不織布、中空長繊維不織布／メルトブローン不織布／中空長繊維不織布、メルトブローン不織布／中空長繊維不織布／メルトブローン不織布、中空長繊維不織布／メルトブローン不織布／中空長繊維不織布／メルトブローン不織布／中空長繊維不織布などの構成を採り得るが、これらに限定されることはない。メルトブローン不織布と積層する場合は、積層体におけるメルトブローン不織布の重量は、油吸着用マットの浮力を損なわないように、通常、７０重量％以下、さらには、５０重量％未満にしておくことが好ましい。
<Oil adsorption mat>
The oil adsorbing mat of the present invention comprises the hollow long fiber nonwoven fabric. The oil adsorbing mat of the present invention is not limited to a roll shape, a sheet shape, a ribbon shape, and the like, and can take various shapes depending on the usage form.
The oil-adsorbing mat of the present invention may be used singly or may be used by laminating with a melt blown nonwoven fabric made of solid fibers or hollow fibers of a propylene polymer having a fiber diameter of less than 10 μm. When laminating with melt blown nonwoven fabric, for example, hollow long fiber nonwoven fabric / melt blown nonwoven fabric, hollow long fiber nonwoven fabric / melt blown nonwoven fabric / hollow long fiber nonwoven fabric, melt blown nonwoven fabric / hollow long fiber nonwoven fabric / melt blown nonwoven fabric, hollow long fiber nonwoven fabric / melt blown nonwoven fabric / A configuration such as a hollow long fiber nonwoven fabric / melt blown nonwoven fabric / hollow long fiber nonwoven fabric may be employed, but is not limited thereto. When laminated with a melt blown nonwoven fabric, the weight of the melt blown nonwoven fabric in the laminate is usually 70% by weight or less, and preferably less than 50% by weight so as not to impair the buoyancy of the oil adsorption mat.
以下、実施例に基づいて本発明をさらに具体的に説明するが、本発明はこれらの実施例に限定されるものではない。
なお、実施例及び比較例における物性値等は、以下の方法により測定した。
EXAMPLES Hereinafter, although this invention is demonstrated further more concretely based on an Example, this invention is not limited to these Examples.
In addition, the physical-property value in an Example and a comparative example was measured with the following method.
（１）プロピレン系重合体の融点（Ｔｍ）の測定方法
プロピレン系重合体の融点（Ｔｍ）は、示差走査熱量計（ＤＳＣ）を用い、以下の方法で実施した。昇温速度；１０℃／分で昇温したときの融解吸熱曲線の極値を与える温度より５０℃程度高い温度まで昇温して、この温度で１０分間保持した後、降温速度；１０℃／分で３０℃まで冷却し、再度、昇温速度；１０℃／分で所定の温度まで昇温したときの融解曲線を測定し、かかる融解曲線から、ＡＳＴＭ Ｄ３４１８の方法に倣い、融解吸熱曲線の極値を与える温度を求め、かかるピーク温度の吸熱ピークを融点（Ｔｍ）とした。
(1) Measuring method of melting point (Tm) of propylene polymer The melting point (Tm) of the propylene polymer was measured by the following method using a differential scanning calorimeter (DSC). Temperature rising rate: The temperature is raised to a temperature that is about 50 ° C. higher than the temperature that gives the extreme value of the melting endothermic curve when the temperature is raised at 10 ° C./min, and held at this temperature for 10 minutes. After cooling to 30 ° C. in minutes, the temperature rise rate; again, the melting curve when the temperature was raised to a predetermined temperature at 10 ° C./min was measured, and from this melting curve, following the method of ASTM D3418, The temperature giving the extreme value was determined, and the endothermic peak at this peak temperature was taken as the melting point (Tm).
（２）繊維径［μｍ］
得られた中空長繊維不織布を光学顕微鏡〔Ｎｉｋｏｎ社製 ＥＣＬＩＰＳＥ Ｅ−４００〕で観察し、画面上のフィラメントから３０本を選びその繊維径を測定し、その平均値を当該不織布の繊維径とした。
(2) Fiber diameter [μm]
The obtained hollow long fiber nonwoven fabric was observed with an optical microscope [ECLIPSE E-400 manufactured by Nikon Corporation], 30 fibers were selected from the filaments on the screen, the fiber diameter was measured, and the average value was defined as the fiber diameter of the nonwoven fabric. .
（３）繊度［ｄ］
中空長繊維不織布の繊度は以下の式を用いて算出した。
繊度[ｄ]＝０．００２２５×π×ρ[g／cm3]×D2[μｍ]×（１−中空率[％]）
ここで、ρ[g／cm3]はプロピレン系重合体の使用温度における溶融密度、Dは繊維径である。
(3) Fineness [d]
The fineness of the hollow long fiber nonwoven fabric was calculated using the following formula.
Fineness [d] = 0.00225 × π × ρ [g / cm 3 ] × D 2 [μm] × (1−hollow ratio [%])
Here, ρ [g / cm 3 ] is the melt density at the use temperature of the propylene polymer, and D is the fiber diameter.
（４）中空率［％］
中空長繊維不織布をエポキシ樹脂に包埋して、次いでミクロトームで切断し、試料片を得る。これを電子顕微鏡〔（株）日立製作所製Ｓ−３５００Ｎ形 走査型電子顕微鏡〕で観察し、得られた断面像より観察された繊維断面像のおける繊維全体の断面積と中空部断面積を求め、以下の式より算出した。
中空率［％］＝（中空部の断面積／繊維全体の断面積）×１００
中空率の値は繊維２０本を測定した平均値とした。
(4) Hollow ratio [%]
A hollow long fiber nonwoven fabric is embedded in an epoxy resin and then cut with a microtome to obtain a sample piece. This was observed with an electron microscope (S-3500N scanning electron microscope manufactured by Hitachi, Ltd.), and the cross-sectional area of the entire fiber and the cross-sectional area of the hollow part in the fiber cross-sectional image observed from the obtained cross-sectional image were obtained. It was calculated from the following formula.
Hollow ratio [%] = (Cross sectional area of hollow part / Cross sectional area of entire fiber) × 100
The value of the hollowness was an average value obtained by measuring 20 fibers.
（５）浮力［N／ｍ2］
ＪＩＳ Ｌ１０９６（６．１９．１ A法 項）に準拠して、ＪＩＳ Z ８７０３（試験場所の標準状態）に規定する温度２０±２℃、湿度６５±２％の恒温室内で、中空長繊維不織布から幅１００ｍｍ×１００ｍｍの試験片を流れ方向（ＭＤ）と横方向（ＣＤ）でそれぞれ１５枚採取する。次いで、浮力試験に使用する重りの重量を空中と１２００ｍｍ×６００ｍｍ×４５０ｍｍの水槽のなかに高さ５００ｍｍまで純水を浸した水中にてバネ秤を使用してそれぞれ測定し、以下の式より重りの浮力を算出した。
重りの浮力＝（水中での重りの重量）−（空中での重量）
次いで、重りと試験片3枚の重量を空中と水中でそれぞれ測定し、以下の式より重りと試験片の浮力を算出した。
重りと試験片の浮力＝（水中での重りと試験片3枚の重量）-（空中での重りと試験片3枚の重量）
重りの浮力と重りと試験片の浮力を使用して、以下の式より単位面積あたりの試験片の浮力を算出した。
浮力［N／ｍ2］＝（（重りと試験片の浮力）−（重りの浮力））÷（０．１×０．１）
また、浮力は試験片5枚分を測定した平均値とした。
(5) Buoyancy [N / m 2 ]
In accordance with JIS L1096 (6.19.1 A method paragraph), hollow long-fiber non-woven fabric in a temperature-controlled room with a temperature of 20 ± 2 ° C. and a humidity of 65 ± 2% specified in JIS Z 8703 (standard state of test place) 15 specimens each having a width of 100 mm × 100 mm are collected in the flow direction (MD) and the transverse direction (CD). Next, the weight of the weight used for the buoyancy test was measured using a spring balance in the air and in a water bath of 1200 mm x 600 mm x 450 mm in pure water up to a height of 500 mm, respectively. The buoyancy of was calculated.
Weight buoyancy = (weight in water)-(weight in air)
Next, the weight and the weight of the three test pieces were measured in the air and in water, respectively, and the buoyancy of the weight and the test piece was calculated from the following formula.
Weight and buoyancy of specimen = (weight in water and weight of 3 specimens)-(weight in air and weight of 3 specimens)
Using the buoyancy of the weight, the weight and the buoyancy of the test piece, the buoyancy of the test piece per unit area was calculated from the following formula.
Buoyancy [N / m 2 ] = ((weight and test piece buoyancy) − (weight buoyancy)) ÷ (0.1 × 0.1)
The buoyancy was an average value obtained by measuring five test pieces.
（６）吸油後の浮き性
ＪＩＳ Ｌ１０９６（６．１９．１ A法 項）に準拠して、ＪＩＳ Z ８７０３（試験場所の標準状態）に規定する温度２０±２℃、湿度６５±２％の恒温室内で、中空長繊維不織布から幅１００ｍｍ×１００ｍｍの試験片を流れ方向（ＭＤ）と横方向（ＣＤ）で試験片を採取する。次いで、１２００ｍｍ×６００ｍｍ×４５０ｍｍの水槽のなかに高さ３００ｍｍまで水を浸し、更に５００ｍｍまでＡ重油（比重：０．８６）を浸した液中にて、試験片を５分間浸した後の試験片の状態から吸油後の浮き性を評価した。
○：試験片が液の表面付近（高さ５００ｍｍ）まで浮かんでいた。
△：試験片が高さ４００ｍｍ付近まで沈んでいた。
×：試験片が高さ３００ｍｍ付近まで沈んでいた。
(6) Floatability after oil absorption According to JIS L1096 (6.19.1 A method paragraph), the temperature specified in JIS Z 8703 (standard state of test place) is 20 ± 2 ° C and humidity is 65 ± 2%. In a temperature-controlled room, a test piece having a width of 100 mm × 100 mm is collected from the hollow long fiber nonwoven fabric in the flow direction (MD) and the transverse direction (CD). Next, the test piece was immersed for 5 minutes in a liquid in which water was immersed in a water tank of 1200 mm × 600 mm × 450 mm to a height of 300 mm and further A heavy oil (specific gravity: 0.86) was immersed to 500 mm. The floatability after oil absorption was evaluated from the state of the piece.
○: The test piece floated to the vicinity of the liquid surface (height 500 mm).
(Triangle | delta): The test piece was sinking to height 400 vicinity.
X: The test piece sank to a height of around 300 mm.
（７）吸油量［倍］
ＪＩＳ Ｌ１０９６（６．１９．１ A法 項）に準拠して、ＪＩＳ Z ８７０３（試験場所の標準状態）に規定する温度２０±２℃、湿度６５±２％の恒温室内で、中空長繊維不織布から幅１００ｍｍ×１００ｍｍの試験片を流れ方向（ＭＤ）と横方向（ＣＤ）で試験片を採取する。この試験片重量Ｗ０を量り、B重油に5分間浸漬する。次いで、3分間大気中に保持して付着した重油を滴下させ除去したのち、試験片重量Ｗ１を量り、次式より吸水率を算出した。これを試験回数３回繰り返し、その平均値を吸油量とした。
吸油量［倍］＝（Ｗ１−Ｗ０）／Ｗ０
(7) Oil absorption [times]
In accordance with JIS L1096 (6.19.1 A method paragraph), hollow long-fiber non-woven fabric in a temperature-controlled room with a temperature of 20 ± 2 ° C. and a humidity of 65 ± 2% specified in JIS Z 8703 (standard state of test place) A test piece having a width of 100 mm × 100 mm is collected in the flow direction (MD) and the transverse direction (CD). Weigh this test piece W0 and immerse it in B heavy oil for 5 minutes. Next, the heavy oil that was kept in the atmosphere for 3 minutes and dropped was removed by dropping, then the test piece weight W1 was measured, and the water absorption was calculated from the following equation. This was repeated three times and the average value was taken as the oil absorption.
Oil absorption [times] = (W1-W0) / W0
（８）回収容易性
ＪＩＳ Ｌ１０９６（６．１９．１ A法 項）に準拠して、ＪＩＳ Z ８７０３（試験場所の標準状態）に規定する温度２０±２℃、湿度６５±２％の恒温室内で、中空長繊維不織布から幅１００ｍｍ×１００ｍｍの試験片を流れ方向（ＭＤ）と横方向（ＣＤ）で試験片を採取する。次いで、１２００ｍｍ×６００ｍｍ×４５０ｍｍの水槽のなかに高さ５００ｍｍまでA重油（比重：０．８６）を浸した液中にて、試験片を５分間浸した後の試験片の外観から回収容易性を評価した。
○：試験片が白色であり油と区別が容易。
△：試験片が灰色であり油と区別がやや困難。
×：試験片が黒色であり油と区別が困難。
(8) Easiness of collection In a temperature-controlled room with a temperature of 20 ± 2 ° C and a humidity of 65 ± 2% as defined in JIS Z 8703 (standard condition at the test site) in accordance with JIS L1096 (6.19.1 A method paragraph) Then, a test piece having a width of 100 mm × 100 mm is collected from the hollow long fiber nonwoven fabric in the flow direction (MD) and the transverse direction (CD). Next, it is easy to recover from the appearance of the test piece after immersing the test piece in a 1200 mm x 600 mm x 450 mm water tank soaked in A heavy oil (specific gravity: 0.86) up to a height of 500 mm. Evaluated.
○: The test piece is white and easy to distinguish from oil.
(Triangle | delta): A test piece is gray and it is a little difficult to distinguish from oil.
X: The test piece is black and difficult to distinguish from oil.
（９）厚み
ＪＩＳ １０９６に準拠し、水処理用濾過材となる中空長繊維不織布の異なる５か所について厚さ測定器を用いて、１０秒間、１．２５ｋＰａの下で厚さを測りその平均値を求めた。
(9) Thickness Based on JIS 1096, the thickness was measured for 10 seconds under 1.25 kPa using a thickness measuring device at five different locations of the hollow long fiber nonwoven fabric used as a water treatment filter material, and the average was measured. The value was determined.
［実施例１］
プロピレン系重合体として荷重２１６０ｇ、２３０℃のＭＦＲが９ｇ／１０分のプロピレン単独重合体を用い、押出機により成形温度２２５℃で溶融し、ノズルピッチが縦方向４．５ｍｍ、横方向４．０ｍｍ、図１に示すような孔形状を有し、図２の繊維断面となる紡糸口金を配置した図３に示すような不織布製造装置（スパンボンド成形機、捕集面上の機械の流れ方向に垂直な方向の長さ：３２０ｍｍ）を用いて、冷却流体に２５℃のエアーを用い、スパンボンド法によりポリオレフィンの単孔吐出量を０．６ｇ/分で紡糸し、捕集ベルト上に堆積させ、次いで、これをニードルパンチで機械的交絡処理（針深度１０ｍｍ、打込み回数１５０回／ｍｉｎ）し、目付量が４００ｇ／ｍ2の長繊維不織布を得た。
得られたフィラメントおよび中空長繊維不織布の評価結果を表１に示す。
[Example 1]
As a propylene polymer, a propylene homopolymer having a load of 2160 g and an MFR of 230 ° C. of 9 g / 10 min was melted by an extruder at a molding temperature of 225 ° C., and the nozzle pitch was 4.5 mm in the vertical direction and 4.0 mm in the horizontal direction. A non-woven fabric manufacturing apparatus (spunbond molding machine, machined on the collecting surface) as shown in FIG. 3 having a hole shape as shown in FIG. Vertical length: 320 mm), using air at 25 ° C. as the cooling fluid, spinning the polyolefin single hole discharge rate at 0.6 g / min by the spunbond method, and depositing on the collection belt Then, this was mechanically entangled with a needle punch (needle depth 10 mm, number of times of driving 150 times / min) to obtain a long fiber nonwoven fabric having a basis weight of 400 g / m 2 .
Table 1 shows the evaluation results of the obtained filaments and hollow long fiber nonwoven fabric.
［比較例１］
通常の丸孔形状（Φ１．３mm）を有する紡糸口金を配置した以外は実施例1と同様に行い、目付量４００ｇ／ｍ2の長繊維不織布を得た。
得られたフィラメントおよび長繊維不織布の評価結果を表１に示す。
[Comparative Example 1]
A long-fiber nonwoven fabric having a basis weight of 400 g / m 2 was obtained in the same manner as in Example 1 except that a spinneret having a normal round hole shape (Φ1.3 mm) was arranged.
Table 1 shows the evaluation results of the obtained filaments and long-fiber nonwoven fabric.
［比較例２］
成形温度を２４５℃にする以外は実施例１と同様に行い、目付量が４００ｇ／ｍ2の長繊維不織布を得た。
得られたフィラメントおよび中空長繊維不織布の評価結果を表１に示す。
[Comparative Example 2]
Except that the molding temperature was 245 ° C., it was carried out in the same manner as in Example 1 to obtain a long fiber nonwoven fabric having a basis weight of 400 g / m 2 .
Table 1 shows the evaluation results of the obtained filaments and hollow long fiber nonwoven fabric.
１；第１の押出機、１’；第２の押出機、２；紡糸口金、３；連続フィラメント、４；冷却風、５；エジェクター、６；捕捉装置、７；吸引装置、８；ウエブ、９；エンボス装置、１０；巻取りロール DESCRIPTION OF SYMBOLS 1; 1st extruder, 1 '; 2nd extruder, 2; Spinneret, 3; Continuous filament, 4; Cooling air, 5; Ejector, 6; Capture device, 7; Suction device, 8; 9; Embossing device, 10; Winding roll
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| WO2015041158A1 (en) | 2013-09-20 | 2015-03-26 | 三菱瓦斯化学株式会社 | Polycarbonate resin usable as oil-adsorbing material |
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| WO2017150740A1 (en) * | 2016-03-04 | 2017-09-08 | エム・テックス株式会社 | Oil-adsorbent mat and production process therefor |
| JP2018047444A (en) * | 2016-09-15 | 2018-03-29 | 日本ソリッド株式会社 | Laminated oil adsorbent |
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| JP2018047444A (en) * | 2016-09-15 | 2018-03-29 | 日本ソリッド株式会社 | Laminated oil adsorbent |
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