JPS6342956B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention aims to provide a novel oil-absorbing material made of a synthetic resin that has excellent oil-absorbing performance, particularly excellent oil-absorbing performance for dispersed oil and emulsified oil in water. In recent years, there has been a great social need to remove oil and fat from water in order to prevent environmental pollution and effectively utilize water resources, and the emergence of high-performance oil-absorbing materials has been desired. As synthetic resin oil absorbing materials, those made of polypropylene and polyurethane are known, but all of these are better called oil absorbing materials rather than oil absorbing materials, and the oil absorbing ability of the material itself is limited. Since most of the oil is adsorbed on the surface, the amount of oil absorbed is small. In addition, these require increasing the surface area by fiberization, foaming, etc., which poses problems in terms of productivity and cost. In addition, because of their special shape, their usage is limited, and their handling requires some ingenuity. Rubber is a material that absorbs oil well, but
Materials that absorb a high degree of oil are difficult to handle because they swell or agglomerate significantly, and their physical properties are greatly reduced. Furthermore, since all of these oil absorbing materials are mainly made of hydrophobic materials, they have poor water wettability and are difficult to set in water, and the absorption rate of oil dispersed in water is not very fast. Recently, various treatment materials have been proposed, such as compositions containing surfactants, silicone oil, etc. on the surface or inside of fibers or resin microstructures, or compositions containing organic polymers, but all of these have been proposed. Very few were effective against oils dispersed in water, especially emulsified oils. Furthermore, Japanese Patent Application Laid-open No. 79954/1983 describes a method for treating wastewater using an oil absorbent made of a mixture of polyethylene and a thermoplastic elastomer. As mentioned above, the oil absorbent used here is a combination of polyethylene and thermoplastic elastomer, but this polyethylene is water repellent and has poor compatibility with thermoplastic elastomer.
There is a phenomenon in which the thermoplastic elastomer swells due to oil absorption, and the oil absorbent adheres or aggregates. This is thought to be due to poor compatibility between the two polymers, and when the two polymers are mixed and formed into particles, the thermoplastic elastomer partially forms agglomerates within the particles. As a result, the oil absorption performance is poor and has little practical value. Further, JP-A-55-49143 describes an oil absorbent made of a mixture of an inorganic compound, an organic polymer, and a surfactant, and describes a thermoplastic elastomer as the organic polymer. However, when a thermoplastic elastomer is used as an organic polymer, it swells when it absorbs oil, causing the oil absorbent to adhere or aggregate, or become fluid, making it difficult to maintain its shape. It is very difficult to do so, and also has the drawback that oil absorption performance cannot be fully demonstrated. As a result of intensive studies aimed at improving these drawbacks of conventional oil absorbing materials, the present inventors found that a mixed composition consisting of an acrylonitrile (co)polymer, a thermoplastic elastomer, and a surfactant overcomes these drawbacks. They solved the problem and discovered that it is very excellent as an oil absorbent material, and after further research, they completed the present invention. That is, the present invention uses acrylonitrile (co-)
The oil absorbent material is a mixture of the above three components, which contains at least 10% by weight of a polymer, at least 30% by weight of a thermoplastic elastomer made of a conjugated diolefin and a monovinyl-substituted aromatic compound, and at least 0.05% by weight of a surfactant. The present invention is an oil absorbent made of a mixture of a thermoplastic elastomer and an acrylonitrile polymer, and the acrylonitrile polymer has good compatibility with the thermoplastic elastomer, and the mixture of the two is very uniformly mixed. It is. This uniformly mixed polymer has a network structure of thermoplastic elastomer and acrylonitrile polymer, and this structure prevents the thermoplastic elastomer from swelling due to oil absorption and prevents adhesion and aggregation of the mixed polymer and particles. It has a protective effect. On the other hand, it has very good oil absorption ability. The reason for this is thought to be that as a result of being able to prevent the thermoplastic elastomer from changing its shape, it became possible to fully utilize its oil absorption ability. As described above, the oil-absorbing agent of the present invention makes it possible to practically use thermoplastic elastomers, which are difficult to use with polyethylene or mixtures with inorganic substances due to swelling when oil-absorbed, and whose oil-absorbing ability cannot be fully utilized. With significantly improved performance,
This is essentially different from the oil absorbent described in the above publication. The configuration of the present invention will be explained in detail below. In the present invention, the above three materials contain at least 10% by weight of an acrylonitrile-based (co)polymer, at least 30% by weight of a thermoplastic elastomer consisting of a conjugated diolefin and a monovinyl-substituted aromatic compound, and at least 0.05% by weight of a surfactant. It needs to be a mixture. Acrylonitrile (co)polymers have the highest wet tension against water among synthetic resins,
It is also known for its high affinity for water, good water wettability, and high solvent resistance. Conversely, thermoplastic elastomers composed of conjugated diolefins and monovinyl-substituted aromatics are known for their lipophilic properties and high oil absorption properties. Furthermore, it is well known that surfactants change the state of dispersion of oil droplets, and by selecting a surfactant according to the type of oil and the state of dispersion, oil droplets can be coagulated or conversely emulsified. be able to. By mixing these three, excellent oil absorption performance can be achieved due to the synergistic effect of their respective strengths. In other words, by mixing an acrylonitrile polymer and a thermoplastic elastomer, even if the thermoplastic elastomer absorbs oil to a high degree, the oil-resistant acrylonitrile polymer suppresses the swelling of the oil-absorbing material and prevents oil absorption. Since it prevents materials from adhering and clumping together, it has excellent oil absorption performance and is also easy to handle. In addition, because of the acrylonitrile polymer, which has the highest wet tension with water among synthetic resins, and the hydrophilic nature of the surfactant, the oil absorbent material has good water wettability and the absorption speed of dispersed oil in water is increased. Very large. By selecting a surfactant, it is possible to destroy the emulsification of emulsified oil, and the oil absorption performance of emulsified oil is also excellent, making it possible to process emulsified oil that has been difficult to process with oil absorbents proposed so far. It is. Furthermore, although the reason is not clear, when an oil-absorbing material made of an acrylonitrile polymer and a thermoplastic elastomer is used as a medium in a fluidized bed oil-water separator, the surface of the oil-absorbing material does not remove the oil in the water. Suspended solids in water (hereinafter abbreviated as SS)
SS is easily removed because it aggregates and becomes coarse particles. In the present invention, in order to fully exhibit oil absorption performance, the content of the acrylonitrile polymer is at least 10% by weight, the thermoplastic elastomer that absorbs oil is at least 30% by weight, and the surfactant The content of 0.05% by weight or more is desirable, although it is effective with a very small amount of content. As mentioned above, the oil absorbent material of the present invention combines the high hydrophilicity of acrylonitrile, the high hydrophilicity of a thermoplastic elastomer, the lipophilicity of a thermoplastic elastomer, and the hydrophilic and oil dispersion destructive effects of a surfactant. Since it has a large oil absorption amount and a fast oil absorption rate, and has a great effect on emulsified oil, and also removes SS, it is not preferable to use it outside the above range because it will lack any of these properties. The acrylonitrile-based (co)polymer used in the present invention is one having an acrylonitrile content of 30% by weight or more, and refers to an acrylonitrile homopolymer, an acrylonitrile copolymer, and an acrylonitrile graft copolymer. Acrylonitrile homopolymers include 100% by weight acrylonitrile, but acrylonitrile copolymers are monomers that can be copolymerized with 30% by weight or more of acrylonitrile and less than 70% by weight of acrylonitrile, such as ethylene, propylene, butadiene, chloro Plain, isoprene, vinyl chloride, vinylidene chloride, vinyl acetate, methyl vinyl ether, ethyl vinyl ether, styrene, α
-Methylstyrene, α-chlorostyrene, vinylnaphthalene, methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, n-hexyl acrylate, 2-
Ethylhexyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, acrylamide, sodium methallylsulfonate,
A copolymer consisting of at least one monomer selected from the group consisting of sulfopropyl methacrylate, styrene sulfonic acid, and 2-acrylamido-2-methylpropanesulfonic acid. These polymers may be used alone or as a mixed polymer of two or more. Also, what is an acrylonitrile graft copolymer?
It refers to a rubber containing conjugated diolefin as a constituent unit, which is graft-polymerized with acrylonitrile alone or with another monomer copolymerizable with acrylonitrile. As a conjugated diolefin, 1,3
-butadiene, isoprene, chloroprene, 1,
There are 3-pentadiene, 2,3-dimethylbutadiene, etc., and these conjugated diolefins can be directly polymerized alone or as a mixture of two or more, or can be further copolymerized with monomers that can be copolymerized with these conjugated diolefins. Acrylonitrile alone or acrylonitrile and monomers copolymerizable with acrylonitrile, such as ethylene, propylene, butadiene, chloroprene, isoprene, vinyl chloride, vinylidene chloride, vinyl acetate, are added to the resulting polymer so that the acrylonitrile content is 30% by weight or more. ,
Methyl vinyl ether, ethyl vinyl ether,
Styrene, α-methylstyrene, α-chlorostyrene, vinylnaphthalene, methyl acrylate,
Ethyl acrylate, n-propyl acrylate, n-butyl acrylate, n-propyl acrylate, n-butyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, acrylic acid, methacrylic acid,
itaconic acid, maleic anhydride, acrylamide,
A polymer obtained by graft polymerization with at least one monomer such as sodium methallylsulfonate, sulfopropyl methacrylate, styrenesulfonic acid, and 2-acrylamide-2-methylpropanesulfonic acid. These acrylonitrile homopolymers, acrylonitrile copolymers, and acrylonitrile graft polymers can be obtained by known polymerization methods, such as radical polymerization, ionic polymerization, radiation polymerization, and the like. The thermoplastic elastomer composed of a conjugated diolefin and a monovinyl-substituted aromatic compound as used in the present invention is a block copolymer composed of a conjugated diolefin and a monovinyl-substituted aromatic compound, and is represented by the following general formula. A-B-A (A-B) _o B-(A-B) _o (A-B) _o -A (A-B) _o X (wherein A is substantially a monovinyl-substituted aromatic compound/block , B is a conjugated diolefin polymer block, X is carbon or hydrocarbon, carbonyl group, phosphorus, silicon, alkyl silicon, or n is 2
(represents an integer up to 10) Block copolymers represented by these general formulas are:
Generally, it can be obtained as follows. That is,
It can be obtained by using lithium hydrocarbon as a polymerization initiator in a hydrocarbon solvent, and adding a conjugated diolefin and a monovinyl-substituted aromatic simultaneously or alternately to form blocks of each polymer. A block copolymer of a desired shape can be obtained by changing the order and number of additions or by using a coupling agent. Any polymerization method in which a conjugated diolefin and a monovinyl-substituted aromatic compound are added alternately and polymerized, and the next compound is added and polymerized when the polymerization of the previously added compound is completed or almost completed. Good too. Further, these thermoplastic elastomers may be used alone or in a mixture of two or more. The conjugated diolefin referred to here is:
1,3-butadiene, isoprene, 1,3-pentadiene, 2,3-dimethylbutadiene, etc., or a mixture of two or more thereof can be selected, and as monovinyl aromatic compounds, styrene, vinyltoluene, vinyl Xylene, ethylstyrene, α-methylstyrene, ethylstyrene, isopropylstyrene, ethylvinyltoluene, t-butylstyrene, vinylnaphthalene, etc., or a mixture of two or more thereof can be selected. As the coupling agent, for example, halogenated hydrocarbons having two or more halokene groups, phoscene, phosphorus trichloride, silicon tetrachloride, 1,2-bis(methylchlorosilyl)ethane, etc. are used. In addition, in the present invention, the molecular weight of the block copolymer is
5,000 to 500,000, and the content of the monovinyl-substituted aromatic compound is preferably 10 to 70% by weight. The surfactant used in the present invention is an anionic, cationic, nonionic, or amphoteric surfactant, as long as it changes the dispersion state of dispersed oil or emulsified oil and causes oil droplets to aggregate. Any of them can be used, but cationic ones or nonionic ones having an amine group, an amide group, or a carboxylic acid group are particularly preferred, such as dimethyltecylbenzylammonium chloride, diethyldotecylbenzylammonium chloride,
trimethyldotecylammonium bromide, allyl dibutyldotecylammonium chloride,
Diethylacetonyl dotecylammonium chloride, triethyldodecyloxymethylammonium chloride, dibenzylhydroxyethyldodecyloxyethylammonium chloride, diethylbenzylthioethylglyside ammonium chloride, diethylbenzyldodecylthioethylammonium chloride, dimethyl p-
Cationic surfactants such as nitrobenzyldodecylammonium chloride, trihydroxyethyldodecylammonium gromide, hexadecylpyridinium chloride, laurylcolaminoformylmethylpyridinium chloride, 2-dodecylisoquinolinium bromide, or polyethylene polyimine, ethanol alkylamine , octadecyldiethanolamine, lauryl dipolyglacolamine, polyoxyethylene tallow alkylamine, dioxystearic acid, diricinoleic acid, polyricinoleic acid, ethylene oxide adduct of dioxystearic acid, and other nonionic surfactants are preferably used. . Among surfactants, those with a high molecular weight are more preferable because they cause less elution when used in water and maintain their effects for a long period of time. As the high molecular weight surfactant, those represented by general formula (1) are used. (However, R ₁ and R ₂ are H, CH ₃ , C ₂ H ₅ , C ₃ H ₇ ,
_{C4H9 ,}

[Formula] CH ₂ CH ₂ OH, CH ₂ - CH=CH ₂ , CH(OH)CH ₂ Cl, X is Cl, Br, I,
CH ₃ SO ₄ , n≧15) The acrylonitrile polymer, thermoplastic elastomer, and surfactant are mixed mechanically using a conventional Banbury mixer, extruder, or the like. Surfactants can also be obtained by heat-treating a mixture obtained by mechanically mixing an acrylonitrile polymer and a thermoplastic elastomer, such as directly or by immersing the mixture in a solution of the surfactant in a solvent and drying. . Furthermore, in this mixing, the mixture
3 to 300 parts by weight of an inorganic substance may be added to 100 parts by weight. Inorganic substances that can be used include aluminum oxide, aluminum silicate, aluminum hydroxide, aluminum sulfate, barium sulfate, calcium oxide, calcium hydroxide, calcium nitrate, calcium sulfate, calcium silicate, magnesium oxide, magnesium hydroxide, and silicic acid. Magnesium, magnesium sulfate, zinc oxide, iron oxide, lead oxide, titanium oxide, silica, kaolin clay, talc, magnesite, pyroferite, montmorillonite, asbestos, activated clay, zeolite,
Mica powder, etc. The oil absorbent of the present invention can be used in the form of powder, pellets, fibers, porous bodies, or molded bodies depending on the purpose, application, and type of target oil or fat, so it is difficult to process conventionally. emulsified oil eruption water such as cutting oil waste water, rolling oil waste water, oil tank cleaning waste water, automobile car wash waste water, machine washing waste water, compressor drain, dispersed oil eruption water such as oil tanker ballast water, bilge water, etc. It is effective in treating fertilized water in a wide range of fields. Examples will be explained below. However, all parts and percentages in the examples indicate weight. In addition, various tests were conducted using the following methods. Fluidized bed test As shown in Figure 1, a cylindrical container with a diameter of 140 mm is partitioned from above into three chambers 1, 2, and 3 with internal volumes of 1.5, 7.5, and 1 using two wire meshes 7 of 10 mesh. A porous pipe 5 connected to an air supply pump 4 is installed in the lower chamber 3, and an air vent 8 is installed in the upper part of the container, and a circulation pump 6 is installed so that the processing liquid flows from top to bottom. Using a fluidized bed tester connected with piping, the oil absorbent was measured to have an apparent volume of 5,
After filling the oil absorbing material filling chamber 2 with a weight of approximately 3 kg, 10 kg of oil-containing wastewater is added, and the circulation pump 6 pumps 20 kg of oil into the filling chamber 2.
While circulating from top to bottom at a flow rate of 20 to 40 min, air is fed from a porous pipe 5 connected to an air supply pump 4 to uniformly flow the oil absorbing material.
After continuing the fluid state for 5 minutes, the treated water was extracted and analyzed for oil and SS. Fixed bed test The flange 15 at the top of a cylindrical column 9 with a 100-mesh wire mesh 11 at the bottom as shown in Figure 2
Remove the oil absorbent material 10 with a height of 1000 mm and a density of
After filling to a concentration of 0.1 to 0.3 g/cc and reinstalling the upper flange, open the valve 12 and pump the oil-containing wastewater from the treated liquid tank 12 from top to bottom using the metering pump 13.
The water was flowed at a flow rate of 150 ml/min, and samples were collected one hour after the flow started, and the oil and SS in the wastewater that came out during the next one hour was analyzed. The oil content and SS were analyzed in accordance with the JIS K0102 factory wastewater test method. Example 1 Acrylonitrile 70%, butyl acrylate 30%
% acrylonitrile (co)polymer, 50 parts of a thermoplastic elastomer consisting of three blocks of (styrene)-(butadiene)-(styrene) containing 40% styrene, and a polymer represented by the following formula. 1 part of the cationic surfactant was extruded into a sheet at 190°C using an extruder, and an oil absorbent in the form of approximately cubic particles with a side of 3 mm was obtained using a sheet pelletizer. (However, the number average molecular weight is approximately 180,000 to 230,000) Using these particles, a nonionic surfactant (Nonipol 200 manufactured by Sanyo Chemical Industries, Ltd.) was applied to car wash wastewater containing 50 ppm of mineral oil and 85 ppm of SS (fine particles such as earth and sand).
A fluidized bed test was conducted using oil-containing wastewater that had been emulsified with a homomixer to which 3ppm had been added. Oil content in treated water is 2ppm (removal rate 96%), SS is 23ppm (removal rate 71%)
The oil absorption performance and SS removal performance were both excellent. Comparative Example 1 A particulate oil absorbent material was produced in the same manner as described above in Example 1 except that the acrylonitrile (co)polymer was not used, and the same test was conducted. It agglomerated and became unusable because it stopped flowing. Comparative Example 2 In Example 1, a particulate oil absorbent material was manufactured in the same manner as in Example 1 except that the cationic surfactant was not used, and the same test was conducted. SS was 38 ppm (removal rate 53%). Example 2 Acrylonitrile 70%, methyl acrylate 30%
% acrylonitrile (co)polymer, 49 parts of a thermoplastic elastomer consisting of four blocks of (butadiene)-(styrene)-(butadiene)-(styrene) containing 40% styrene, and the following ( ) were extruded using an extruder at 190° C. to obtain a pellet-like oil absorbent having a diameter of 3 mm and a length of 3 mm. Using the pellets, mineral oil content 60ppm, SS
Nonionic surfactant (Nonipol 200 manufactured by Sanyo Chemical Industries) for car wash wastewater (fine particles such as earth and sand) of 50 ppm
A fluidity test was conducted using oil-containing wastewater that had been emulsified with a homomixer by adding 2 ppm of . Oil content in treated water is 4ppm (removal rate 93%), SS is 18ppm (removal rate 64%).
%), and both oil absorption performance and SS removal performance were excellent. Comparative Example 3 For comparison, 98 parts of polypropylene and 2 parts of the cationic surfactant of Example 2 were extruded using an extruder, and a diameter of 3
A test similar to that in Example 2 was conducted using pellets with a length of 3 mm and a length of 3 mm. The oil content of the treated water is
43ppm (removal rate 28%), SS is 37ppm (removal rate 26%)
Therefore, both oil absorption performance and SS removal performance were significantly inferior to Example 2. Examples 3 to 5, Comparative Examples 4 to 6 The contents of the acrylonitrile (co)polymer and cationic surfactant of Example 1 were changed as shown in Table 1, and sheets were produced at 190°C using an extruder. The oil absorbent material was extruded into a shape using a sheet pelletizer to obtain approximately cubic particles having a side of 3 mm. Using these oil absorbing materials, 5 ppm of a nonionic surfactant (Nonipol 200 manufactured by Sanyo Chemical Industries, Ltd.) was added to meat processing plant wastewater containing 100 ppm of animal oil and 150 ppm of SS (colloidal protein). A fluidity test was conducted using oil-containing wastewater that was emulsified using a mixer. The results are shown in Table 1.

[Table] Examples 6 to 9, Comparative Examples 7 to 8 Acrylonitrile-vinyl acetate copolymers with varying acrylonitrile contents as shown in Table 2 were used.
45 parts of the thermoplastic elastomer of Example 2, and 0.5 parts of the cationic surfactant of Example 2 were mixed and extruded to form pellets.
A flow test was conducted using oil-containing wastewater that was emulsified with a homomixer by adding 4ppm of a nonionic surfactant (Nonipol 200 manufactured by Sanyo Chemical Industries) to car wash wastewater containing 80ppm and SS (sediment particles) of 50ppm. The results are shown in Table 2. For comparison, Table 2 also shows the results of the same test in which polypropylene was used instead of the acrylonitrile (co)polymer and mixed with a thermoplastic elastomer and a cationic surfactant.

[Table] Examples 10 to 11 A fixed bed test was conducted using powders with a diameter of 1 to 2 mm obtained by mechanically pulverizing the oil absorbing materials of Examples 1 and 2 and emulsified and dispersed oil-containing water. However, the emulsified and dispersed oil-containing wastewater used was 100 ppm of cutting oil and a nonionic surfactant (Nonipol manufactured by Sanyo Chemical Industries, Ltd.).
200) was emulsified using a homomixer.
The results are shown in Table 3.

[Table] Example 12 100 parts of the powder of Example 10 was mixed with 30 parts of aluminum hydroxide, mixed again in a Banbury mixer, and then ground using a powder of 1 to 2 mm, containing 40 ppm of mineral oil and 30 ppm of SS. Nonionic surfactant (Nonipol 200 manufactured by Sanyo Chemical Industries, Ltd.) in car wash wastewater
A fixed bed test was conducted using oil-containing wastewater that had been emulsified with a homomixer to which 3ppm had been added. The results were shown below. Oil content 4ppm (removal rate 90%) SS 2ppm (removal rate 93%) Examples 13-16 Contains 60% acrylonitrile, 40% acrylonitrile-based (co)polymer of vinyl chloride 40%, and 35% α-methylstyrene { (α-methylstyrene)
- (Isoprene)} ₂ - Thermoplastic elastomer made of (α-methylstyrene) block copolymer64
and 1 part of various cationic surfactants shown in Table 4 were mixed and made into pellets with an extruder of 3 mm in diameter and 3 mm in length, with an animal and vegetable oil content of 200 ppm, SS
(Protein) 10ppm in 100ppm meat processing plant wastewater
Surfactant (Nonipol 200 manufactured by Sanyo Chemical Industries)
was added and emulsified using a homomixer, and the oil-impregnated water was subjected to a fluidized bed test. The results are shown in Table 4.

【table】 [Brief explanation of the drawing]

FIG. 1 and FIG. 2 are explanatory diagrams of the apparatus used for testing the oil absorbent material of the present invention. 1... Upper chamber, 2... Oil absorbent filling chamber, 3...
Lower chamber, 4... Air pump, 5... Porous pipe, 6...
...Circulation pump, 7...10 mesh wire mesh, 8...Air bleed, 9...Fixed bed column, 10...Oil absorption material, 11...100 mesh wire mesh, 12...Valve,
13...metering pump, 14...processing liquid tank, 15...
...Flange, 16... Receiver.

Claims (1)

[Scope of Claims] 1 At least 10% by weight of an acrylonitrile-based (co)polymer, at least 30% by weight of a thermoplastic elastomer consisting of a conjugated diolefin and a monovinyl-substituted aromatic compound, and at least a surfactant.
An oil absorbing material consisting of a mixture of the above three components containing 0.05% by weight. 2. The oil absorbent material according to claim 1, wherein the acrylonitrile (co)polymer contains 30% by weight or more of acrylonitrile. 3 Acrylonitrile-based (co)polymers include acrylonitrile, ethylene, propylene, butadiene, chloroprene, isoprene, vinyl chloride, vinylidene chloride, vinyl acetate, methyl vinyl ether, ethyl vinyl ether, styrene, α-methylstyrene, α-chlorostyrene, vinylnaphthalene , methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, acrylamide, sodium methallyl sulfonate, sulfopropyl methacrylate, styrene sulfone The oil absorbent material according to claim 1, comprising at least one monomer selected from the group consisting of acids 2-acrylamide and 2-methylpropanesulfonic acid. 4. The oil absorbent material according to claim 1, wherein the acrylonitrile-based (co)polymer is an acrylonitrile homopolymer. 5. Claim 1, wherein the acrylonitrile-based (co)polymer is a polymer obtained by graft polymerizing acrylonitrile or acrylonitrile and a monomer copolymerizable therewith to a rubber containing conjugated diolefin as a constituent unit. oil absorbent material. 6 Thermoplastic elastomer has general formula, A-B-A
2. The oil absorbent material according to claim 1, which is a block copolymer represented by the formula (wherein A substantially represents a monovinyl-substituted aromatic compound polymer block and B represents a conjugated diolefin polymer block). 7 Thermoplastic elastomer has the general formula, (A-B) _o
(wherein A is essentially a monovinyl-substituted aromatic compound polymer block, B is a conjugated diolefin polymer block, and n is an integer from 2 to 10). Oil-absorbing material according to scope 1. 8 The thermoplastic elastomer has the general formula B-(A-
B) A block copolymer represented by _o (wherein A is substantially a monovinyl-substituted aromatic compound polymer block, B is a conjugated diolefin polymer block, and n represents an integer from 2 to 10). The oil absorbing material according to claim 1. 9 Thermoplastic elastomer has general formula, (A-B) _o
- A patent for a block copolymer represented by A (wherein A is substantially a monovinyl-substituted aromatic compound polymer block, B is a conjugated diolefin polymer block, and n is an integer from 2 to 10). The oil absorbent material according to claim 1. 10 Thermoplastic elastomer has general formula, (A-B)
_O 2. The oil absorbent material according to claim 1, which is a block copolymer represented by the formula (representing an integer up to 10). 11. The oil absorbent material according to claim 1, wherein the thermoplastic elastomer is a block copolymer of a conjugated diolefin and a monovinyl-substituted aromatic compound containing 10 to 70% by weight of a monovinyl-substituted aromatic compound. 12. The oil absorbent material according to claim 1, wherein the mixture of the acrylonitrile (co)polymer and the thermoplastic elastomer contains an inorganic compound. 13. The oil absorbent material according to claim 1, wherein the surfactant is a cationic surfactant or a nonionic surfactant having an amine group, an amide group, or a carboxylic acid group. 14. The oil absorbent material according to claim 1, wherein the surfactant is a polymer having a molecular weight of 3000 or more. 15. The oil absorbent material according to claim 1, wherein the surfactant is a surfactant represented by the following general formula (1). (However, R ₁ and R ₂ are H, CH ₃ , C ₂ H ₅ , C ₃ H ₇ ,
C ₄ H ₉ , [Formula] CH ₂ CH ₂ OH, CH ₂ - CH=CH ₂ , CH(OH)CH ₂ Cl, X is Cl, Br, I,
CH ₃ SO ₄ , n≧15).