Adsorbent for oil adsorption and manufacturing method of adsorbent for oil adsorption

Abstract

To provide an adsorbent for oil adsorption capable of floating on water and sufficient adsorption of oils by using a relatively small amount of a desired compound, and a manufacturing method of adsorbent for oil adsorption.SOLUTION: An adsorbent for oil adsorption that floats on water includes a cellulosic material and a water repellent included in the cellulosic material, wherein the cellulosic material is 95 wt.% or over and the water repellent is 0.2 wt.% or over and 5.0 wt.% or under by the outside ratio.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil absorbing material and a method for manufacturing the oil absorbing material. In particular, the present invention relates to a water-floating oil absorbing material and a method for manufacturing the oil absorbing material. [Background technology]

[0002] Various technologies have been developed that use waste paper containing natural fibers as a raw material for oil adsorbents, with the aim of recovering waste oil discharged from restaurants, commercial facilities, food processing facilities, etc. For example, a method for manufacturing an oil adsorbent is known in which cardboard coated with wax over almost the entire outer surface is crushed into fibers to produce an oil adsorbent (see, for example, Patent Document 1). The oil adsorbent described in Patent Document 1 can adsorb a large amount of oil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-165914 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the oil sorbent described in Patent Document 1 requires the use of a large amount of wax, at least 20% by weight of the cardboard, when coating the cardboard with wax, making it difficult to reduce manufacturing costs. Furthermore, because the oil sorbent described in Patent Document 1 simply coats the cardboard surface with wax, the wax tends to peel off from the cardboard surface, which can reduce the oil absorbing effect, or the oil sorbent can sink into the water over time when floated on the water surface. If the oil sorbent sinks into the water, it becomes difficult to recover the oil-adsorbed oil sorbent.

[0005] Therefore, an object of the present invention is to provide an adsorbent for oil adsorption that floats on water and can sufficiently adsorb oil by using a relatively small amount of a specified compound, and a method for manufacturing an adsorbent for oil adsorption. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention provides an adsorbent for oil adsorption that floats on water, which comprises a cellulosic material and a water repellent agent contained in the cellulosic material, wherein the cellulosic material is 95 wt% or more and the water repellent agent is 0.2 wt% or more and 5.0 wt% or less in terms of external proportion.

[0007] Furthermore, in order to achieve the above-mentioned object, the present invention provides a method for manufacturing a water-floating adsorbent for oil adsorption, which comprises a defibration step of defibrating cellulosic material, a preparation step of preparing an aqueous solution of water repellent by diluting a water repellent with water, and an impregnation step of impregnating the defibrated cellulosic material with the aqueous solution of water repellent, wherein the cellulosic material is 95 wt% or more and the water repellent is 0.2 wt% or more and 5.0 wt% or less in terms of external proportion. [Effects of the Invention]

[0008] According to the oil adsorbent and the method for manufacturing an oil adsorbent of the present invention, it is possible to provide an oil adsorbent that floats on water and can sufficiently adsorb oil by using a relatively small amount of a specified compound, and a method for manufacturing an oil adsorbent. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Embodiment Mode] <Outline of oil adsorbent> The water-floating oil adsorbent according to an embodiment of the present invention is composed of a cellulosic material and a water repellent agent impregnated in the cellulosic material. That is, the water-floating oil adsorbent (hereinafter sometimes simply referred to as an "oil adsorbent" or "adsorbent") comprises a cellulosic material and a water repellent agent, and the water repellent agent is impregnated or absorbed into the cellulosic material from its surface. The oil adsorbent is manufactured by adding a small amount (approximately a few wt%) of water repellent agent to the cellulosic material.

[0010] In this way, an oil adsorbent made by impregnating a cellulosic material with a water repellent agent can adsorb large amounts of oil without sinking when placed in water that has oil mixed in, even though only a small amount of water repellent agent has been added. Therefore, the oil adsorbent according to this embodiment can adsorb large amounts of oil simply by being placed in wastewater containing waste oil, and because it does not sink in water even after adsorbing the oil (it does not sink in water even when subjected to the water pressure of the wastewater flow), it can be extremely easily recovered after adsorbing the oil.

[0011] <Details of oil adsorbent> The oil adsorbent according to this embodiment is a water-floating oil adsorbent. The oil adsorbent comprises a cellulosic material and a water repellent agent contained in the cellulosic material, with the cellulosic material being 95 wt% or more and the water repellent agent being 0.2 wt% to 5.0 wt%. The proportion of the water repellent agent added in this embodiment is calculated by an external ratio. For example, the external ratio means the amount of water repellent agent present in the cellulosic material expressed in wt% when the mass of the cellulosic material is 100 wt%.

[0012] (cellulosic materials) The cellulose-based material is a cellulose-based material that has water absorption properties. Specifically, one or more types of cellulose fibers can be selected from plant-derived cellulose fibers, animal-derived cellulose fibers (e.g., cellulose fibers isolated from sea squirts, seaweed, etc.), and microbial-derived cellulose fibers (e.g., cellulose fibers produced by acetic acid bacteria, etc.). Note that the cellulose-based material may be a material that has been pre-impregnated with paraffin or the like and discarded after being used for a specific purpose.

[0013] Examples of plant-derived cellulose fiber raw materials include plant fibers such as pulp obtained from natural plant materials such as wood, bamboo, hemp, Manila hemp, sisal, jute, kenaf, cotton, beet, agricultural waste, and cloth. Examples of cellulose fiber raw materials include paper (kraft paper, copy paper, etc.), waste paper (newspaper, cardboard, magazine, copy paper, etc.), recycled paper, coated paper, kraft paper, cardboard, used cardboard, used tea leaves, coffee grounds, cotton linters, and / or jute bags. Examples of wood include cedar, cypress, eucalyptus, and acacia. The cellulose fiber raw materials can be used alone or in combination of two or more.

[0014] Furthermore, the cellulosic material is preferably a fibrous cellulosic material obtained by subjecting a raw material to a defibration treatment, i.e., a cellulose-containing material containing cellulose fibers. From the viewpoint of appropriately incorporating a water repellent into the cellulosic material, the fiber length of the cellulose fibers obtained by subjecting the raw material to a defibration treatment is, for example, preferably 0.5 mm or more, and also preferably 1.0 mm or more, and preferably 10.0 mm or less, and also preferably 5.0 mm or less, and also preferably 2.5 mm or less. Similarly, the fiber width of the cellulose fibers obtained by subjecting the raw material to a defibration treatment is, for example, preferably 1 μm or more, and also preferably 10 μm or more, and also preferably 20 μm or more, and preferably 200 μm or less, and also preferably 100 μm or less, and also preferably 50 μm or less, and also preferably 30 μm or less.

[0015] (Amount of cellulosic material blended) The amount of cellulose-based material in the adsorbent for oil adsorption according to this embodiment is 90 wt% or more, preferably 95 wt% or more, also preferably 98 wt% or more, and may be 99 wt% or more.

[0016] (Water repellent) The water repellent may be a compound that imparts water resistance to paper or the like. Specifically, it is preferable to use a cationic or anionic sizing agent. Examples of sizing agents that can be used include rosin-based sizing agents containing rosin as the main component, alkylketene (AKD)-based sizing agents containing alkylketene dimer as the main component, alkenylsuccinic anhydride-based sizing agents containing alkenylsuccinic anhydride as the main component, and styrene acrylate-based sizing agents containing synthetic resin as the main component. The viscosity of these sizing agents at 25°C is 300 mPa·s or less, and may be 200 mPa·s or less, 150 mPa·s or less, 100 mPa·s or less, or 50 mPa·s or less, from the viewpoint of easy spraying onto cellulosic materials. Note that in this embodiment, wax (wax-based water repellent), silicone-based water repellent, and / or zirconium-based water repellent are excluded from the water repellent.

[0017] (Water repellent amount) In the oil adsorbent according to this embodiment, the amount of water repellent blended is, in terms of exclusive percentage, 0.1 wt% or more, optionally 0.2 wt% or more, optionally 0.4 wt% or more, optionally 5.0 wt% or less, optionally 1.0 wt% or less, or optionally 2.0 wt% or less. Note that, per 100 parts by mass of cellulosic material, the amount of water repellent blended may be 0.2 parts by mass or more, optionally 0.4 parts by mass or more, optionally 5.0 parts by mass or less, or optionally 2.0 parts by mass or less.

[0018] (Other additives) Various additives such as property adjusters, reinforcing agents, colorants, flame retardants, antioxidants, antiaging agents, antistatic agents, ultraviolet absorbers, ultraviolet dispersants, solvents, fragrances, deodorizers, pigments, dyes, fillers, and talc may be added to the adsorbent for oil adsorption according to this embodiment as needed, within the range that does not impair the physical properties, etc., of the adsorbent for oil adsorption.

[0019] (Water absorption of oil adsorbent) The oil adsorbent according to this embodiment is an adsorbent that floats on water. Specifically, when the oil adsorbent is placed in water, it floats on water for at least 24 hours or more after being placed in water. Furthermore, the adsorbent continues to float on water even after it has adsorbed oil.

[0020] (Ratio of oil absorption to the amount of water repellent added in an oil adsorbent) The oil adsorbent according to this embodiment is manufactured so that the ratio of the oil absorption capacity of the oil adsorbent to the amount of water repellent added during the manufacture of the oil adsorbent is equal to or greater than a predetermined value. For example, suppose that an oil adsorbent x (g) is placed in oil-contaminated water, and the oil adsorbent adsorbs y (g) of oil. Furthermore, suppose that the amount of water repellent added during the manufacture of this oil adsorbent is a (wt%). In this case, the amount of water repellent in the oil adsorbent used to adsorb the oil is A = (a × x) / 100 (g). Therefore, the ratio of the oil absorption capacity to the amount of water repellent added (hereinafter, this ratio may be referred to as "B") is expressed as y / A (g / g).

[0021] In this embodiment, B is 100 or more, and may be 200 or more, 1,000 or more, 3,000 or more, or 5,000 or more.

[0022] <Other uses> The adsorbent according to this embodiment hardly absorbs water (that is, it does not absorb moisture), and therefore can also be used for the following purposes.

[0023] (a) Anti-mold materials A mold-preventing member, a cellulosic material; a water repellent agent contained in the cellulosic material; and The cellulosic material is 95 wt% or more, The antifungal member has a water repellent agent content of 0.2 wt% or more and 5.0 wt% or less by weight.

[0024] The cellulosic material has a water repellent agent on its surface, which prevents moisture in the air from being absorbed into the cellulosic material, thereby preventing mold from growing on the mold-proofing component.

[0025] ((b) Heat insulating materials) A heat insulating member, a cellulosic material; a water repellent agent contained in the cellulosic material; and The cellulosic material is 95 wt% or more, The heat insulating member has a water repellent agent content of 0.2 wt% or more and 5.0 wt% or less by weight.

[0026] The cellulose-based material can be obtained by defibrating. This allows the cellulose-based material to contain voids, and the air contained in these voids provides heat insulation. In addition, the surface of the cellulose-based material contains a water-repellent agent, which can prevent mold from growing on the heat-insulating component.

[0027] The constituent elements of the antifungal member and / or the heat insulating member may be the same as some or all of the constituent elements of the adsorbent for absorbing oil according to this embodiment.

[0028] <Manufacturing method 1 of oil adsorbent (sizing agent treatment method)> The water-floating oil adsorbent according to this embodiment can be manufactured as follows. First, raw cellulosic material is defibrated by mechanical defibration or the like (defibration process). This results in cellulosic material with a predetermined fiber length and width. Meanwhile, a water-repellent aqueous solution is prepared by diluting a predetermined amount of a predetermined water-repellent agent (sizing agent) with water (e.g., distilled water) (preparation process). The defibrated cellulosic material obtained in the defibration process is then impregnated with the water-repellent aqueous solution prepared in the preparation process (impregnation process). In this case, the blending amounts of each material are adjusted so that the cellulosic material is 95 wt% or more and the water-repellent agent is 0.2 wt% to 5.0 wt% (exclusive). The impregnation process can also impregnate the defibrated cellulosic material with the water-repellent aqueous solution by, for example, spraying a mist of the water-repellent aqueous solution onto the defibrated cellulosic material one or more times. This allows the water-repellent agent to penetrate from at least a portion of the surface of the cellulosic material to the interior of the cellulosic material.

[0029] The cellulose-based material impregnated with the aqueous water repellent solution is then aged for a predetermined time in a predetermined container (aging process). After the aging process, the cellulose-based material impregnated with the aqueous water repellent solution is dried by heating or warming at a predetermined temperature for a predetermined time (drying process). This produces a water-floating oil adsorbent according to this embodiment.

[0030] <Method 2 for manufacturing adsorbents for oil adsorption (internal addition method)> The water-floating oil adsorbent according to this embodiment can also be manufactured using the following method. First, a raw cellulosic material is defibrated by mechanical defibration or the like (defibration process). This results in a cellulosic material having a predetermined fiber length and a predetermined fiber width. This defibrated cellulosic material is mixed with a water repellent solution containing a predetermined amount of a predetermined water repellent in a container such as a tank to prepare a mixture (mixing process). Next, the mixed mixture is made into a sheet through various processes, such as a predetermined preparation process using a wet papermaking device, a predetermined papermaking process, a predetermined sheet formation, and / or a drying process such as dry winding. This sheet can also be wound into a roll. The sheet is then defibrated by mechanical defibration or the like (re-defibration process), thereby producing the water-floating oil adsorbent according to this embodiment. In the mixing process, the concentration of the water repellent mixed with the cellulose-based material is set to a higher concentration than the desired concentration to be contained in the sheet obtained after each process using a wet papermaking machine (i.e., to leave the water repellent at the desired concentration relative to the mass of defibrated cellulose after dehydration. Specifically, the cellulosic material in the sheet is 95 wt% or more and the water repellent is 0.2 wt% or more and 5.0 wt% or less).

[0031] <Effects of the embodiment> The floating oil adsorbent according to the present embodiment can adsorb a large amount of oil while floating on the water by simply incorporating a small amount of water repellent into the cellulose-based material. As a result, the adsorbent according to the present embodiment can efficiently adsorb oil contained in wastewater from, for example, kitchens in hotels, inns, restaurants, cafeterias, and / or service areas, as well as food processing facilities. Furthermore, when the oil adsorbent according to the present embodiment is placed in a grease trap installed in a kitchen, the adsorbent can maintain its floating state and adsorb a large amount of oil. Therefore, because the oil adsorbent according to the present embodiment floats on the water even when it has adsorbed a large amount of oil, it is easy to recover the adsorbent, improving the efficiency of oil recovery work.

[0032] [Experimental Example] The present invention will be explained in more detail below by way of experimental examples. Note that these experimental examples are merely illustrative and should not be construed as limiting.

[0033] <Production of oil adsorbent> (Preparation of Cellulosic Materials) The following raw materials were used as raw materials for the cellulosic materials. ·cardboard ·Hemp bag Cotton linter

[0034] Each raw material was defibrated using a mechanical defibrator ("ATOMZ" manufactured by Ishikawa Research Institute Co., Ltd.) to obtain pass products (pass products, which are samples obtained by passing through a φ10 screen) with a screen diameter of φ10 (fiber length: 1 to 2.5 mm, fiber width: 20 to 30 μm). That is, the following pass products were obtained.

[0035] (Pass product list) Cardboard fiber defibrator (φ10) ·Hemp bag defibrated product (φ10) · Cotton linter defibrated (φ10)

[0036] (sizing agent) On the other hand, the following sizing agents were used as water repellents. All of the following sizing agents are manufactured by Arakawa Chemical Industries, Ltd. "Sizepine" is a registered trademark. Size Pine K903-20 (solid content 20wt%) Cationic alkyl ketene dimer (AKD) emulsion sizing agent. Size pine 924 (solid content 30wt%) Anionic AKD emulsion sizing agent. Size Pine N-775 (solid content 50wt%) Anionic rosin emulsion sizing agent. Size Pine E (solid content 30wt%) Anionic rosin solution (neutralized salt) sizing agent.

[0037] (Production of adsorbent for oil adsorption - Experimental Examples 1 to 18) The adsorbent of Experimental Example 1 was manufactured by adjusting the solid content of the sizing agent (Size Pine K903-20) to 0.20 wt% (0.20 wt% sizing agent added) relative to the mass of the raw material, defibrated cardboard (φ10). First, 200 g of an aqueous sizing agent solution was prepared by diluting the sizing agent with distilled water to a predetermined concentration (1 g of sizing agent, 199 g of distilled water, concentration 0.1 wt%). Next, 100 g of raw material was placed in a plastic bag, and the prepared aqueous sizing agent solution was sprayed onto the raw material using a spray bottle. The raw material sprayed with the aqueous sizing agent solution was then aged at room temperature for 24 hours in the plastic bag to allow the sizing agent to penetrate the raw material. After aging, the raw material impregnated with the sizing agent was placed in a tray-type heated vacuum dryer and dried at 120°C under reduced pressure for 1 hour. This produced an adsorbent of Experimental Example 1.

[0038] In the same manner as above, the adsorbent according to Experimental Example 2 (sizing agent: Size Pine K903-20, sizing agent amount: 0.40 wt%), the adsorbent according to Experimental Example 3 (sizing agent: Size Pine K903-20, sizing agent amount: 0.80 wt%), the adsorbent according to Experimental Example 4 (sizing agent: Size Pine K903-20, sizing agent amount: 2.00 wt%), the adsorbent according to Experimental Example 5 (sizing agent: Size Pine 924, sizing agent amount: 0.20 wt%), Adsorbent according to Experimental Example 6 (sizing agent: Size Pine 924, amount of sizing agent added: 0.40 wt%), adsorbent according to Experimental Example 7 (sizing agent: Size Pine 924, amount of sizing agent added: 0.80 wt%), adsorbent according to Experimental Example 8 (sizing agent: Size Pine 924, amount of sizing agent added: 1.00 wt%), adsorbent according to Experimental Example 9 (sizing agent: Size Pine 924, amount of sizing agent added: 2.00 wt%), adsorbent according to Experimental Example 10 (sizing agent: Size Pine 924, amount of sizing agent added: 2.00 wt%) 924, amount of sizing agent added: 4.00 wt%), adsorbent according to Experimental Example 11 (sizing agent: Sizepine N-775, amount of sizing agent added: 0.40 wt%), adsorbent according to Experimental Example 12 (sizing agent: Sizepine N-775, amount of sizing agent added: 1.00 wt%), adsorbent according to Experimental Example 13 (sizing agent: Sizepine N-775, amount of sizing agent added: 2.00 wt%), adsorbent according to Experimental Example 14 (sizing agent: Sizepine N-775, amount of sizing agent added: The following were produced: an adsorbent according to Experimental Example 15 (sizing agent: Sizepine N-775, sizing agent amount added: 4.00 wt%), an adsorbent according to Experimental Example 16 (sizing agent: Sizepine E, sizing agent amount added: 0.40 wt%), an adsorbent according to Experimental Example 17 (sizing agent: Sizepine E, sizing agent amount added: 1.00 wt%), and an adsorbent according to Experimental Example 18 (sizing agent: Sizepine E, sizing agent amount added: 2.00 wt%). In addition, a blank sample containing no sizing agent was produced by treating the raw material in the same manner using 200 g of tap water instead of a sizing agent.

[0039] Furthermore, adsorbents according to Experimental Examples were produced in which each sizing agent was applied to each raw material in the same manner as described above, and blank samples were also produced for each raw material. That is, adsorbents and blank samples according to Experimental Examples 19 to 21 were produced in the same manner as Experimental Examples 1 to 10, except that the raw material was a jute bag. Adsorbents and blank samples according to Experimental Examples 22 to 23 were produced in the same manner as Experimental Examples 5 to 10, except that the raw material was cotton linters. The blending amounts of cellulosic material and sizing agent in each Experimental Example are as shown in Tables 1 to 3. Specifically, Table 1 shows the results of producing an adsorbent using a cardboard fiberboard product, Table 2 shows the results of producing an adsorbent using a jute bag fiberboard product, and Table 3 shows the results of producing an adsorbent using a cotton linter fiberboard product.

[0040] [Table 1]

[0041] [Table 2]

[0042] [Table 3]

[0043] <Oil absorption test> The adsorbents of each experimental example and the blank sample were subjected to an oil absorption test as follows: First, the oils used in the oil absorption test were as follows:

[0044] (Oils used in oil absorption tests) Salad oil (Nisshin Canola Oil, manufactured by Nisshin Oillio Group, Inc., density: 0.91g / ml) Dioctyl phthalate (Kanto Chemical Co., Ltd., Di-2-ethylhexyl Phthalate (Grade 1), density: 0.95 g / ml)

[0045] (Oil absorption test procedure) The oil absorption test was carried out according to the following procedure. 1) Put 400cc of tap water and 110cc of oil into a 1000cc flask. 2) 10 g of the adsorbent according to Experimental Example 1 was placed in the flask prepared in 1) above. 3) After adding the adsorbent, stir at 200 rpm for 20 minutes. 4) After stirring, the floating adsorbent according to Experimental Example 1 is scooped up with a net and allowed to stand on top of the flask for 3 minutes (this allows the water adhering to the adsorbent and the oil not adsorbed by the adsorbent to be returned to the flask). 5) Transfer the water and oil remaining in the flask to a 500cc measuring cylinder and allow the phases to separate. 6) After phase separation, measure the volume (cc) of the oil layer and calculate the oil absorption (g) using the density of the oil.

[0046] The results of the oil absorption test conducted according to the above procedure are shown in Tables 4 to 6. Specifically, Table 4 shows the oil absorption test results for cardboard disintegrated products, Table 5 shows the oil absorption test results for gunny bag disintegrated products, and Table 6 shows the oil absorption test results for cotton linter disintegrated products. The adsorbents according to each Experimental Example, except for the blank sample, always floated on water from step 2) above to step 4) above in the oil absorption test procedure until they were scooped up with a net. Furthermore, the adsorbents according to Experimental Examples 1 to 23 were placed in a beaker containing water and observed for 24 hours, and it was confirmed that all of the adsorbents floated on water after 24 hours had passed.

[0047] In Tables 4 to 6, the oil absorption rate of salad oil (ratio of oil absorption rate to the amount of water repellent added (g / g)) was calculated using the following formula.

[0048] Percentage of salad oil absorption = (100 × salad oil absorption (g)) / (amount of sizing agent added (wt%) × mass of adsorbent added (g))

[0049] In Tables 4 to 6, the oil absorption rate of dioctyl phthalate (ratio of oil absorption rate to the amount of water repellent added (g / g)) was calculated using the following formula.

[0050] Dioctyl phthalate oil absorption rate = (100 × dioctyl phthalate oil absorption rate (g)) / (amount of sizing agent added (wt%) × mass of adsorbent added (g))

[0051] [Table 4]

[0052] [Table 5]

[0053] [Table 6]

[0054] As can be seen from the results of the oil absorption test, the ratio of oil absorption to the amount of water repellent added was 100 or more for all of the adsorbents according to Experimental Examples 1 to 23, demonstrating that a very large amount of oil can be adsorbed by adding just a small amount of water repellent. It was also shown that all of the adsorbents according to Experimental Examples 1 to 23 were able to adsorb oil while floating on water.

[0055] Although the embodiments and experimental examples of the present invention have been described above, the embodiments and experimental examples described above do not limit the invention according to the claims. It should be noted that not all of the combinations of features described in the embodiments and experimental examples are necessarily essential to the means for solving the problems of the invention.

[0056] The adsorbent for absorbing oil and the method for manufacturing the adsorbent for absorbing oil according to this embodiment can also be referred to in the following appendix, which should not be confused with the claims. (Additional note 1) An adsorbent for oil adsorption that floats on water even after oil adsorption, a fibrous cellulosic material; a water repellent agent impregnated (or absorbed) into the interior of the cellulose-based material from the surface thereof; and The cellulosic material is 95 wt% or more, The water-floating adsorbent for oil adsorption has a solid content of 0.1 wt% or more and 5.0 wt% or less. (Additional note 2) Item 1. The adsorbent for adsorbing oil according to item 1, wherein the water repellent is a sizing agent and excludes wax, silicone-based water repellent, and / or zirconium-based water repellent. (Additional note 3) Item 1. The adsorbent for oil adsorption according to item 1, wherein the water repellent agent is impregnated into the interior of the cellulose-based material from at least a portion of the surface thereof. (Additional note 4) A method for producing a water-floating adsorbent for oil adsorption, comprising: a defibration step of defibrating a cellulosic material; a preparation step of preparing an aqueous solution of a water repellent by diluting the water repellent with water; an impregnation step of impregnating the defibrated cellulosic material with the water repellent aqueous solution; an aging step of aging the cellulose-based material impregnated with the water repellent aqueous solution; a drying step of drying the cellulose-based material impregnated with the water-repellent aqueous solution after the aging step; Equipped with The cellulosic material is 95 wt% or more, A method for producing an adsorbent for absorbing oil that floats on water, wherein the water repellent agent is present in an amount of 0.2 wt% or more and 5.0 wt% or less.

Claims

1. A water-floating adsorbent for oil adsorption, a cellulosic material; a water repellent agent contained in the cellulosic material; and The cellulosic material is 95 wt % or more, The adsorbent for oil adsorption has a water repellent agent content of 0.2 wt % or more and 5.0 wt % or less by external percentage.

2. 2. The adsorbent for absorbing oil according to claim 1, which floats on water for at least 24 hours after being placed in water.

3. 2. The oil absorbing material according to claim 1, wherein the ratio of the oil absorption amount of the oil absorbing material to the amount of the water repellent added is 100 or more.

4. 2. The adsorbent for adsorbing oil according to claim 1, wherein the water repellent is a sizing agent.

5. 2. The adsorbent for oil adsorption according to claim 1, wherein the raw material of the cellulosic material is at least one selected from the group consisting of paper, waste paper, recycled paper, coated paper, kraft paper, cardboard, used cardboard, used tea leaves, and hemp bags.

6. 2. The adsorbent for oil adsorption according to claim 1, wherein the cellulose-based material is a cellulose-containing material obtained by defibration treatment.

7. A method for producing a water-floating adsorbent for oil adsorption, comprising: a defibration step of defibrating a cellulosic material; a preparation step of preparing an aqueous solution of a water repellent by diluting the water repellent with water; an impregnation step of impregnating the defibrated cellulosic material with the water repellent aqueous solution; Equipped with The cellulosic material is 95 wt % or more, A method for producing an adsorbent for adsorbing oil, wherein the water repellent agent is present in an amount of 0.2 wt % or more and 5.0 wt % or less by external proportion.

8. A method for producing a water-floating adsorbent for oil adsorption, comprising: a defibration step of defibrating a cellulosic material; a mixing step of mixing the defibrated cellulosic material with a water repellent solution containing a water repellent to obtain a mixture; a papermaking step of making the mixture into a sheet; a re-fibrillation step of defibrating the sheet; Equipped with The cellulosic material is 95 wt % or more, A method for producing an adsorbent for adsorbing oil, wherein the water repellent agent is present in an amount of 0.2 wt % or more and 5.0 wt % or less by external proportion.

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