JPH0852350A - Oil absorbing sheet - Google Patents

Abstract

PURPOSE:To provide an oil absorbing sheet efficiently absorbing an oil component and capable of especially adsorbing an oil component high in viscosity. CONSTITUTION:An oil absorbing sheet has sheet like base materials 1A, 1B and the oil absorbing material layer 2 provided between both base materials and the oil absorbing material layer 2 contains swellable oil absorbing particles 3 and occlusion type oil absorbing particles 4 in a mixed state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-absorbent sheet used for collecting leaked oil, etc., and is devised so as to be particularly suitable for collecting highly viscous oils such as salad oil and machine oil.

[0002]

2. Description of the Related Art In recent years, due to environmental problems caused by the outflow of oil into rivers, lakes and marshes, there is a strong demand for measures to recover and remove oil before the outflow.

That is, measures are taken for collecting oil when it leaks to the road or floor, measures for leaking machine oil, heavy oil, etc. at factories, etc., and measures for collecting edible oil at home, restaurants, etc. It is necessary to prevent the occurrence of pollution.

As a countermeasure against these problems, a method of adsorbing an oil content on an oil absorbing material and incinerating it has been used as an effective means. Examples of the oil-absorbing material used here include natural pulp-based oil-absorbing agents such as wood pulp, coconut fiber, kapok fiber, and cotton, synthetic fiber-based oil-absorbing materials such as polyethylene fiber, polypropylene fiber, polyester fiber, and foamed polyurethane. There are foamed resin-based oil absorbing materials such as foams, and oil absorbing materials in which oil absorbing material particles are supported on a hydrophobic porous substrate (hydrophobic fiber).

[0005]

However, among these oil-absorbing materials, sheet-like or mat-like ones made of fibrous material have an oil absorbing action by absorbing and retaining oil in the spaces between the fibers. Since it is expressed, the oil retaining performance after oil absorption is poor, and the oil content easily absorbed is re-released by a slight external pressure, resulting in oil sagging.

Therefore, the present inventors have previously developed an oil-absorbent sheet comprising a sheet-like hydrophilic porous substrate and oil-absorbent material particles fixed to at least a part of the hydrophilic porous substrate. .

However, such an oil-absorbent sheet is insufficient in oil absorption speed and oil absorption ratio for practical use.

An object of the present invention is to provide an oil-absorbent sheet which can absorb oil more efficiently and can adsorb an oil having particularly high viscosity.

[0009]

A first aspect of the present invention for achieving the above object comprises a sheet-like base material and an oil absorbing material layer provided on at least one surface of the sheet-like base material, The oil-absorbent material layer is an oil-absorbent sheet characterized by containing swellable oil-absorbent material particles and storage-type oil-absorbent material particles in a mixed state.

A second aspect of the present invention is characterized in that, in the oil-absorbent sheet of the first aspect, the oil-absorbent material layer has a second sheet-like base material covering the oil-absorbent material layer. On the sheet.

A third aspect of the present invention is the oil-absorbent sheet of the second aspect, wherein at least one of the two sheet-like base materials is a permeable base material. It is in.

According to a fourth aspect of the present invention, in the oil-absorbent sheet of the second aspect, one of the two sheet-like base materials is a permeable base material and the other is a water resistant base material. An oil-absorptive sheet characterized by the above.

A fifth aspect of the present invention is characterized in that, in the oil-absorbent sheet of the second aspect, at least one of the two sheet-like base materials is a releasable base material. Located on the oil absorbing sheet.

In a sixth aspect of the present invention, in the oil-absorbent sheet according to any one of the first to fifth aspects, the swellable oil-absorbent material particles are acrylic high oil-absorbent resin, and the storage-type oil-absorbent material particles are An oil-absorbent sheet characterized by being zeolite.

A seventh aspect of the present invention is the oil-absorbent sheet according to any one of the first to sixth aspects, wherein the oil-absorbent material layer has a binder for adhering the oil-absorbent material layer to the sheet-shaped substrate. The oil-absorptive sheet is characterized by.

An eighth aspect of the present invention is the oil-absorbent sheet according to any one of the first to seventh aspects, wherein the storage-type oil-absorbent material particles are 8 to 100% by weight relative to the swellable oil-absorbent material particles.
The oil-absorbent sheet is characterized by being contained.

A ninth aspect of the present invention is the oil-absorbent sheet according to any of the first to eighth aspects, wherein the storage-type oil-absorbent material particles have a particle size of 10 to 500 μm. On the sheet.

A tenth aspect of the present invention is the oil-absorbent sheet according to any one of the first to ninth aspects, wherein the swellable oil-absorbent material particles have a particle size of 30 to 500 μm. On the sheet.

The constitution of the oil-absorbent sheet of the present invention will be described in more detail below.

The oil-absorbent material layer of the present invention contains at least swellable oil-absorbent material particles and storage-type oil-absorbent material particles.
It is formed by applying a coating liquid to which an adhesive binder is added, if necessary.

Here, the swellable oil-absorbent material particles are particles of acrylic high-grade oil-based resin (for example, a cross-linked polymer disclosed in JP-A-3-221582), polynorbornene-based oil-absorbent resin, styrene-based oil-absorbent resin, or the like. It is an oil-absorbing material that is a type of powder that absorbs oil and swells. The particle size of the swellable oil-absorbent material may be such that it can be formed into a layer by coating or the like, but the particle size is preferably about 30 to 500 μm, preferably 100 to 400 μm. This is because if the particle size is smaller than this, the oil absorbency of the oil absorbing material layer tends to be poor, and if the particle size is larger, it tends to be difficult to form a layer.

The occlusion-type oil-absorbing material is an oil-absorbing material that has oil-absorbing performance but does not cause a large change in state such as swelling due to oil absorption. Examples thereof include inorganic materials such as zeolite, silica, talc, clay, and peat moss. Examples thereof include organic type such as kapok and polyurethane foam, and inorganic type is particularly effective in the present invention. The storage type oil-absorbent material particles have a particle size of about 10 to 500 μm, preferably about 50 to 300 μm. When the particle size is smaller than the above range, the adhesive state between the oil-absorbent material layer and the sheet-shaped base material tends to be inhibited, and the spacing between the swellable oil-absorbent material particles when mixed with the swellable oil-absorbent material particles is reduced. The effect of unfolding cannot be exhibited. On the other hand, if the particle size is larger than the above range, it tends to be an obstacle when forming the coating layer. The oil absorbent material layer of the present invention contains the swellable absorbent material particles and the occlusion type oil absorbent material particles in a mixed state. In this case, the mixing ratio of both is such that the occluding oil absorbing material particles are contained in an amount of 8 to 100% by weight, preferably 50 to 85% by weight, based on the swelling oil absorbing material particles. This is because if the proportion of the occlusion-type oil-absorbing material particles is too large, the adhesiveness of the oil-absorbing material layer to the sheet-shaped substrate tends to be inhibited, and if it is too small, the effect of mixing the occlusion-type oil absorbing material particles is exerted. Because it is not done.

When forming the above-mentioned oil absorbing material layer, the coating amount is 40 to 250 g / m ² in solid content, preferably 90
It is about 150 g / m ² . Since the oil-absorbing material particles have a certain size, it is not possible to reduce the coating amount too much. On the other hand, when the coating amount is too large, the swelling oil-absorbing material particles are too close to each other and the swelling property is large. The oil absorption amount per unit weight of the oil-absorbing material particles decreases, and a cost problem arises.

As a method for forming the oil-absorbent material layer of the present invention, a coating liquid containing a binder added to the oil-absorbent material particles is applied onto a sheet-like base material, and then another sheet-like base material is oil-absorbed as necessary. A method of superposing it on the coated surface of the material can be mentioned. Here, the purpose of adding the binder is to attach the oil-absorbent material layer to the sheet-shaped substrate in addition to imparting coating suitability.

The binder used for this purpose may be of any type as long as it does not inhibit the oil absorbing performance of the oil absorbing material particles because it is mixed with the oil absorbing material particles and does not dissolve in the oil absorbed. Further, it is preferable to use a binder in which the oil-absorbent material particles are not detached from the sheet-shaped base material or the sheet-shaped base material is not separated even after the oil absorption.

Specific examples of the binder usable in the present invention include acrylic adhesives, rubber adhesives, polysaccharides such as starch, cellulose resins such as carboxymethyl cellulose, carboxypropyl cellulose and hexyl ethyl cellulose, and polyacrylics. Natural or synthetic polymers such as acids and polyacrylamides may be used alone or in combination of two or more.

The acrylic pressure-sensitive adhesive may be selected from, for example, acrylic acid ester homopolymers, copolymers containing two or more acrylic acid ester units as main components, and copolymers of acrylic acid esters and functional monomers. A material containing at least one selected is used.

Examples of the acrylic acid ester include (meth) acrylic acid ethyl ester, (meth) acrylic acid propyl ester, (meth) acrylic acid butyl ester, (meth) acrylic acid pentyl ester, (meth) acrylic acid hexyl ester. , (Meth) acrylic acid heptyl ester, (meth) acrylic acid octyl ester,
Examples thereof include (meth) acrylic acid nonyl ester and (meth) acrylic acid decyl ester. Examples of the functional monomer include hydroxyl group-containing monomers such as (meth) acrylic acid, (meth) acrylic acid hydroxyethyl ester, (meth) acrylic acid hydroxypropyl ester, or (meth) acrylamide, dimethel (meta). ) Examples include amide group-containing monomers such as acrylamide.

As the rubber-based pressure-sensitive adhesive, the main component is, for example, natural rubber, polyisoprene rubber, polyisobutylene, polybutadiene rubber, styrene-butadiene-
Those containing at least one selected from styrene block copolymers, styrene-isoprene-sterene block copolymers and the like are used. If desired, a tackifier, a plasticizer, an antiaging agent, a filler and the like can be added to the rubber-based pressure-sensitive adhesive.

Further, in applications requiring a large amount of oil absorption, it is preferable to use a hydrophilic binder. When a lipophilic binder is used, the binder used to carry the oil-absorbent particles is plasticized by the oil-absorption, the adhesive strength is reduced by swelling, peeling at the interface with the sheet-shaped substrate or the oil-absorbent particles The harmful effects such as falling off occur. However, since the hydrophilic binder is incompatible with oils, the oil-absorbent material particles can be reliably supported between the sheet-shaped base materials. As the hydrophilic binder, among the above-mentioned natural and synthetic water-soluble polymers, among the above-mentioned acrylic ester copolymers, those having a copolymer ratio of at least 10% of hydrophilic monomers are preferable. Specifically, (meth) acrylic acid ethyl ester-
(Meth) acrylic acid copolymer, (meth) acrylic acid butyl ester- (meth) acrylic acid copolymer, (meth) acrylic acid 2-ethylhexyl ester- (meth) acrylic acid copolymer, (meth) acrylic acid Ethyl ester
(Meth) acrylic acid 2-hydroxyethyl ester copolymer, (meth) acrylic acid butyl ester- (meth) acrylic acid 2-hydroxyethyl ester copolymer, (meth) acrylic acid 2-ethylhexyl ester- (meth)
Acrylic acid 2-hydroxyethyl ester copolymer or the like is used.

When the oil-absorbent sheet of the present invention is manufactured, particularly when a hydrophilic binder is used, the sheet-shaped base material to which the coating liquid is applied is a water-resistant base material whose surface to be applied is water-resistant treated. Preferably there is. This is because if the water absorbency at the time of applying the coating liquid is too high, the coating workability is deteriorated. Therefore, the water-resistant substrate here is a sheet that does not have water absorbency enough to reduce the coating workability. Say. Examples of the water resistant substrate include resin sheets such as polyethylene laminated paper, polyethylene sheet and polypropylene sheet, and paper that has been processed for imparting water resistance. Further, instead of the water resistant substrate, a releasable substrate such as a release paper having a surface treated with silicone can be used.

The oil-absorbent sheet of the present invention includes such an embodiment in which the oil-absorbent material layer is provided on the sheet-shaped substrate. In such a form, since the adhesive oil-absorbent material layer is exposed,
It can be used by being attached to an object to be oil-absorbed. However, in this form, handling until use is inconvenient, and the oil-absorbent material particles and the like are likely to fall off from the oil-absorbent material layer except for the purpose of sticking and using.

Therefore, it is preferable that another sheet-shaped base material is further provided on the oil-absorbent material layer so that the oil-absorbent material layer is sandwiched between two sheet-shaped base materials.

When the oil-absorbing material layer is sandwiched between two sheet-like base materials as described above, and when the coating base is a water-resistant base material as described above, a sheet-like base material to be overlaid on the coating layer. The material is preferably a permeable matrix that is permeable to at least the oil to be absorbed. Here, as the permeable base material, hydrophilic natural fibers such as wood pulp, cotton, vinylon, rayon and the like, and non-woven fabrics obtained by using one or more kinds of synthetic fibers, and porous and oil-absorbing materials such as crepe paper are used. Examples of the material include a material having properties, a woven cloth such as cotton cloth, and a paper sheet such as ordinary high-quality paper.

Further, in the form in which the oil absorbing material layer is sandwiched between two sheet-like base materials, when the coating base is a releasable base material as described above, a sheet-like base material to be laminated on the coating layer. As the material, it is possible to use a permeable base material or a water resistant base material that penetrates at least the oil to be absorbed. The oil-absorbent sheet having such a form can be used after peeling the peelable base material. In the sheet from which the releasable base material has been peeled off in this manner, the adhesive oil-absorbing material layer is exposed, and therefore this sheet can be used by being attached to an oil-absorption object.

[0036]

In the oil-absorbent sheet in which the oil-absorbent material layer contains the swellable oil-absorbent material particles and the occlusion-type oil-absorbent material particles, the swellable oil-absorbent material particles and the occlusion-type oil-absorbent material particles are present in a mixed state, so that the swellability is improved. The oil-absorbent particles become separated from each other. Therefore, the space between the swellable oil-absorbent material particles serves as a path for oil to be absorbed, and also serves as a space in which the swellable oil-absorbent material particles swell. Thereby, the oil absorption rate is improved and the oil absorption amount per unit weight of the swellable oil absorbent material is increased.

When the oil-absorbent material layer contains a specific amount of swellable oil-absorbent material particles having a specific particle diameter, the swellable oil-absorbent material particles are separated from each other. Therefore, the space between the swellable oil-absorbent material particles serves as a path for oil to be absorbed, and also serves as a space in which the swellable oil-absorbent material particles swell. As a result, as in the case described above, the oil absorption rate is improved, and the oil absorption amount per unit weight of the swellable oil absorbent particles is increased.

[0038]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic sectional view showing an embodiment of the present invention. As shown in FIG. 1, the oil absorbing material layer 2 is sandwiched between the sheet-shaped base materials 1A and 1B. Also,
The oil absorbent material layer 2 is composed of swellable oil absorbent material particles 3, occlusion type oil absorbent material particles 4 and a binder 5.

In such an oil-absorbing sheet, the sheet-shaped substrate 1
At least one of A and 1B needs to be capable of penetrating the oil to be absorbed or capable of peeling. That is, when the forms of the oil-absorbent sheet of the present invention are arranged, the sheet-shaped base material 1A is coated with the coating liquid,
When the sheet-shaped base material 1B is superposed on the applied coating layer, it is as follows. As the sheet-shaped base material 1A, a hydrophilic base material, a water resistant base material, a peelable base material or the like can be used, but when the oil absorbent material layer 2 is formed using a hydrophilic binder, a water resistant base material is used. It is preferable to use a material or a peelable substrate. On the other hand, as the sheet-shaped base material 1B, it is preferable to use a permeable base material that permeates at least the oil to be absorbed. When the sheet-shaped substrate 1A is a releasable substrate, a non-permeable substrate such as a water-resistant substrate can be used as the sheet-shaped substrate 1B.

When a hydrophilic porous substrate was used as the permeable substrate for at least one of the sheet-shaped substrates 1A and 1B, it was absorbed and carried in the voids between the fibers of the hydrophilic porous substrate. The oil-absorbing material particles have an oil-absorbing function of further absorbing oil, and exhibit excellent oil-absorbing performance as compared with conventional oil-absorbing materials. That is, since the oil absorbent particles further absorb the oil content absorbed by the porous base material, the oil retaining performance is excellent, and the post-treatment is easy without causing oil dripping. Further, since the hydrophilic porous base material is used, the oil content once absorbed by the porous base material is efficiently transferred to the oil absorbing agent, and the surface of the oil absorbent sheet is not sticky due to the oil content and is smooth. Give status. Further, the hydrophilic porous base material is an oil-absorbing material that has been conventionally used even though it is hydrophilic, and since it has an oil-absorbing / oil-retaining function in the inter-fiber voids of the porous base material, the oil-absorbing material of this example is used. The elastic sheet is a sheet having the oil absorbing ability of the porous base material and the oil absorbing material. From this point, especially for low viscosity oil,
Since the oil content once absorbed by the porous substrate is transferred to the oil-absorbent material particles at a high speed, the oil-absorbing ability is higher than that of the conventional oil-absorbing material having only the porous substrate and no oil dripping is observed.

In the oil-absorbent sheet of the present invention, the types of the sheet-shaped base materials 1A and 1B, the oil-absorbent material particles 3 and 4, and the binder 5 may be changed according to various uses.

As the binder 5, it is preferable to use a hydrophilic binder in order to obtain a high oil absorption performance as described above. However, an oil in which oil is suspended or an oil having a low oil content and a high hydrophilic component is used. When treating the water mixture, it is preferred to use a water-resistant binder or a cross-linked water-based binder.

Here, as the water-resistant binder, the above-mentioned acrylic or rubber adhesive is used, and when the acrylic adhesive is used, the polymerization ratio of the hydrophilic monomer is preferably 5% or less. . Examples of the cross-linking agent added to the aqueous binder include glyoxal, melamine, polyfunctional epoxy compounds, and chromium acetate. In the case of this treatment, unlike the conventional hydrophobic porous substrate, the oil-absorbent sheet of the present invention uses a hydrophilic porous substrate having a large contact area with water, and therefore a large amount of moisture is used. However, since the base material efficiently adsorbs this moisture and the oil-absorbing material particles absorb and adsorb the oil, even an oil-water mixture exhibits excellent oil-absorbing performance. Further, in this case, the oil-absorbent sheet of the present example, after adsorbing once, after draining water by squeezing the oil-absorbent sheet, etc., until the oil absorbing performance of the oil absorbing material particles is saturated, the same operation is repeated many times It has the advantage of being reusable.

The oil-absorbent sheet of the present invention shown in FIG. 1 has a sandwich structure in which an oil-absorbent material layer is sandwiched between sheet-like base materials, but the present invention is limited thereto as described above. Instead, the sheet-shaped base material 1B may be removed.

Next, the present invention will be specifically described with reference to examples.

(Example 1) On a polyethylene laminated paper (KL-64 Shiro (Corona); manufactured by Lintec Co., Ltd.), a coating solution having the following composition was coated at a solid content of 10
It was applied so as to be 0 g / m ² . Then on this,
Nonwoven fabric made of 100% wood pulp and weighing 45 g / m ² (Pulcloth P-45; manufactured by Honshu Kinocloth Co., Ltd.)
Were overlapped and pressed to obtain an oil-absorbent sheet having an oil-absorbent material layer sandwiched between two sheet-shaped base materials.

Here, the swellable oil-absorbent material particles are oleosorb SL-160 which is an acrylic oil-absorbent resin.
(A particle size of about 300 μm, a water-based 60% dispersion; manufactured by Nippon Shokubai Co., Ltd.) is used as occlusion-type oil-absorbing material particles, and a particle size of about 50 to 60 μm zeolite (CELITE) is used.
# 560; manufactured by Tokyo Kogyo Trading Co., Ltd.) was used.
As the binder, a polyacrylic ester copolymer-based adhesive (water-based 50% emulsion) was used. The pH was adjusted with a small amount of aqueous ammonia in order to mix these well and form a coating solution.

(Compounding) Component Solid content ratio Swellable oil-absorbent material particles 60 parts by weight Storage-type oil-absorbent material particles 30 parts by weight Binder 36 parts by weight (Example 2) Instead of the non-woven fabric laminated on the coating layer in Example 1. In the same manner as in Example 1 except that high-quality paper (white silver; rice weighing 30 g / m ² ; manufactured by Nippon Paper Industries Co., Ltd.) was used.
An oil absorbing sheet was produced.

(Example 3) Instead of the polyethylene laminated paper coated with the coating liquid in Example 1, a release paper (SP-
8E Ivory; manufactured by Lintec Co., Ltd. was used to prepare a sheet in the same manner as in Example 1. Then, the release paper was peeled off, and the nonwoven fabric used in Example 1 was attached to the exposed oil-absorbent material layer surface to obtain an oil-absorbent sheet.

(Example 4) Instead of the polyethylene laminated paper coated with the coating liquid in Example 1, a release paper (SP-
8E Ivory; manufactured by Lintec Co., Ltd.
An oil absorbing sheet was produced in the same manner as in Example 1 except that zeolite (CELITE # 545; manufactured by Tokyo Kogyo Trading Co., Ltd.) having a particle size of about 30 to 40 μm was used as the storage type oil absorbing material particles.

(Example 5) A coating solution for forming an oil-absorbing material layer was formulated as follows, and as a storage-type oil-absorbing material particle, a zeolite (CELITE # 545;
An oil absorbing sheet was produced in the same manner as in Example 1 except that (Tokyo Kogyo Trading Co., Ltd.) was used.

(Compounding) Component Solid content ratio Swellable oil absorbing material particles 60 parts by weight Storage type oil absorbing material particles 10 parts by weight Binder 36 parts by weight (Example 6) The coating liquid for forming the oil absorbing material layer was prepared as follows. , Storage-type oil-absorbing material particles having a particle size of about 30 to 40 μm
An oil absorbing sheet was prepared in the same manner as in Example 1 except that m zeolite (CELITE # 545; manufactured by Tokyo Kogyo Trading Co., Ltd.) was used.

(Compounding) Component Solid content ratio Swellable oil-absorbent material particles 60 parts by weight Storage-type oil-absorbent material particles 50 parts by weight Binder 36 parts by weight (Comparative Example 1) A coating solution for forming an oil-absorbent material layer was prepared as follows. An oil absorbing sheet was produced in the same manner as in Example 1 except that the above was performed.

(Compounding) Component Solid content ratio Swellable oil-absorbent material particles 60 parts by weight Binder 21 parts by weight (Comparative Example 2) Example 2 except that the coating solution for forming the oil-absorbent material layer was the following composition. Similarly, an oil-absorbent sheet was produced.

(Compounding) Component Solid content ratio Swellable oil-absorbent material particles 60 parts by weight Binder 21 parts by weight (Comparative Example 3) An oil-absorbent sheet was prepared in the same manner as in Comparative Example 1 except that the coating amount was increased to 180 g in terms of solid content. It was made.

(Comparative Example 4) A coating solution for forming an oil-absorbing material layer was blended as described below, and storage-type oil-absorbing material particles having a particle size of about 50 to 60 μm zeolite (CELITE # 560;
An oil absorbing sheet was produced in the same manner as in Example 1 except that (Tokyo Kogyo Trading Co., Ltd.) was used.

(Compounding) Component Solid content ratio Storage type oil absorbing material particles 30 parts by weight Binder 50 parts by weight (Oil absorbing test) Regarding the oil absorbing sheets of Examples 1 to 6 and Comparative Examples 1 to 4 described above, the oil absorbing test is as follows. I went. That is, each oil-absorbent sheet was immersed in various oils for a predetermined time, and then the amount of oil absorbed per 1 g of the oil-absorbent sheet and per 1 g of the oil-absorbent material in each oil-absorbent sheet was measured. The results are shown in Tables 1 to 9 and FIGS. 2 to 10.

[0059]

[Table 1]

[0060]

[Table 2]

[0061]

[Table 3]

[0062]

[Table 4]

[0063]

[Table 5]

[0064]

[Table 6]

[0065]

[Table 7]

[0066]

[Table 8]

[0067]

[Table 9]

From the above results, although it is not possible to make a simple comparison depending on the type of the base material used, Examples 1 to 6 in which the swellable oil-absorbing material particles and the occlusion-type oil-absorbing material particles were added to the oil-absorbing material layer
The oil absorption is improved, especially the oil absorption with respect to highly viscous salad oil and machine oil. That is, by mixing the occlusion-type oil-absorbing material, the initial oil-absorbing speed is increased, and the oil absorption amount (oil-absorbing efficiency) per 1 g of the oil-absorbing material is significantly improved. Also, this tendency is remarkable for highly viscous oils such as machine oil and salad oil. This effect is
It is clear from the relationship between Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, and Example 3 and Comparative Example 3. Further, it can be seen from Examples 5 and 6 that the larger the blending amount of the occlusion type oil absorbing material, the more remarkable the effect. It should be noted that the reason why such an effect is exhibited is not simply due to the presence of the occlusion-type oil-absorbing material particles, but due to the synergistic effect of mixing the swellable oil-absorbing material particles and the occlusion-type oil-absorbing material particles. It is also clear from the results of Comparative Example 4 showing the oil absorbing performance of the occlusion type oil absorbing material particles.

[0069]

As described above, the present invention improves the oil absorption speed and oil absorption efficiency by mixing the swellable oil-absorbing material particles and the occlusion-type oil-absorbing material particles into the oil-absorbing material layer of the oil-absorbing sheet. This has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the structure of an oil-absorbent sheet according to an embodiment of the present invention.

FIG. 2 is a graph showing the results of the oil absorption test of Example 1 of the present invention.

FIG. 3 is a graph showing the results of an oil absorption test of Example 2 of the present invention.

FIG. 4 is a graph showing the results of an oil absorption test of Example 3 of the present invention.

FIG. 5 is a graph showing the results of the oil absorption test of Example 4 of the present invention.

FIG. 6 is a graph showing the results of oil absorption tests of Examples 5 and 6 of the present invention.

FIG. 7 is a graph showing the results of an oil absorption test of Comparative Example 1 of the present invention.

FIG. 8 is a graph showing the results of an oil absorption test of Comparative Example 2 of the present invention.

FIG. 9 is a graph showing the results of the oil absorption test of Comparative Example 3 of the present invention.

FIG. 10 is a graph showing the results of the oil absorption test of Comparative Example 4 of the present invention.

[Explanation of symbols]

 1A, 1B Sheet material base material 2 Oil absorbing material layer 3 Swellable oil absorbing material particles 4 Storage type oil absorbing material particles 5 Binder

Claims (10)

[Claims] 1. A sheet-shaped base material, and an oil-absorbent material layer provided on at least one surface of the sheet-shaped base material, wherein the oil-absorbent material layer comprises swellable oil-absorbent material particles and storage-type oil-absorbent material particles. An oil-absorptive sheet characterized by being contained in a mixed state. 2. The oil absorbing sheet according to claim 1, wherein
The oil-absorbent sheet has a second sheet-shaped base material covering the oil-absorbent layer. 3. The oil absorbing sheet according to claim 2,
At least one of the two sheet-shaped base materials is a permeable base material. 4. The oil absorbing sheet according to claim 2,
One of the two sheet-like base materials is a permeable base material, and the other is a water-resistant base material. 5. The oil absorbing sheet according to claim 2,
An oil-absorptive sheet, wherein at least one of the two sheet-shaped substrates is a peelable substrate that can be peeled. 6. The oil-absorbent sheet according to claim 1, wherein the swellable oil-absorbent material particles are acrylic high oil-absorbent resin, and the storage-type oil absorbent material particles are zeolite. An oil-absorptive sheet. 7. The oil absorbing sheet according to claim 1, wherein the oil absorbing material layer has a binder that adheres the oil absorbing material layer to the sheet-shaped base material. Sheet. 8. The oil-absorbent sheet according to claim 1, wherein the storage-type oil-absorbent material particles are contained in an amount of 8 to 100% by weight based on the swellable oil-absorbent material particles. Oil-absorbing sheet. 9. The oil-absorbent sheet according to claim 1, wherein the storage-type oil-absorbent material particles have a particle size of 10
An oil-absorptive sheet having a thickness of 500 μm. 10. The oil-absorbent sheet according to claim 1, wherein the swellable oil-absorbent material particles have a particle size of 3
An oil-absorbent sheet having a thickness of 0 to 500 μm.