JPH09150486A - Oil absorbing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil absorbing sheet selectively absorbing an oil component and hard to sink under the water. SOLUTION: An oil absorbing sheet 1 is constituted by almost uniformly distributing oil absorbing regions over a base material sheet 10 subjected to water repelling treatment. The oil absorbing regions 12 are formed by enclosing an oil absorbing agent 20 by a porous film 12a being one example of an oil permeable film. The base material sheet 10 is formed from polypropylene and, as the oil absorbing agent 20, various gelling agents can be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet that absorbs oil, and more particularly to an oil-absorbing sheet that selectively absorbs only oil to absorb water and is difficult to sink.

[0002]

2. Description of the Related Art In the modern industrial world, the role of petroleum resources plays a significant role, and the use of such petroleum resources is
It covers a wide range such as fuel and lubricating oil for automobiles and various machines. Since petroleum resources are related to various industries, fuel oil and lubricating oil may leak and pollute the surrounding environment when performing various operations. Care was taken to prevent oil leaks and spills and to minimize the spread if spilled. For example, if oil such as heavy oil leaks to the sea or river due to a contact accident with a tanker, create an oil fence with a rubber sheet with a float to surround the spilled oil area or spray a surfactant on the spilled oil. In order to prevent the diffusion of the spilled oil and absorb the spilled oil, an oil-absorbing sheet mainly made of cellulose or an oil-absorbing mat formed by filling a bag-like body made of the oil-absorbing sheet with a granular oil-absorbing material has been introduced.

[0003]

However, in the method of introducing the cellulose oil-absorbing sheet as described above, since the sheet absorbs not only the oil but also the water, it is submerged in water after oil absorption. There was a problem that it was difficult to collect. Further, in the oil absorption mat of the bag body, there is a problem that the filled oil absorbent is ubiquitous in the bag body and the oil absorption effect becomes uneven. The present invention has been made in view of the problems of the prior art as described above, and an object thereof is to provide an oil-absorbing sheet that selectively absorbs oil and is hard to be submerged in water.

[0004]

As a result of intensive studies to solve the above problems, the present inventors have found that the above objects can be achieved by appropriately using a material that selectively absorbs oil. The present invention has been completed. That is, the oil-absorbing sheet of the present invention is an oil-absorbing sheet formed by disposing oil-absorbing parts on a base sheet, wherein the oil-absorbing parts are substantially uniformly dispersed and arranged on the base sheet, and inside the oil-permeable film. It is characterized by being filled with an oil absorbing agent. In this oil absorbing sheet, the oil absorbing portions are arranged substantially uniformly over the entire surface of the base material sheet, and the oil permeable film can be formed of a porous film or the like. Further, in this oil absorbing sheet, it is preferable that the base sheet has waterproofness.

[0005]

In the present invention, the base sheet is provided with an oil absorbent which selectively absorbs oil and does not absorb water. Therefore, the oil-absorbent sheet of the present invention is unlikely to absorb moisture and is unlikely to sink even when it is put into an outflow oil sea area or a river area. Further, in the present invention, the oil-absorbing portion formed by surrounding the above oil-absorbing agent with the oil-permeable film is arranged on the base sheet in a substantially evenly dispersed manner. Therefore, normally, the granular oil absorbing agent is hard to be unevenly distributed due to the inclination of the base sheet and exhibits a uniform oil absorbing ability over the entire base sheet. It should be noted that the oil-permeable membrane is sufficient as long as it allows oil to permeate but does not leak the oil absorbing agent, and a typical example is a porous membrane.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below by way of embodiments with reference to the drawings, but the present invention is not limited to these embodiments. FIG. 1 is a partially cutaway perspective view showing an embodiment of the oil absorbing sheet of the present invention. In the figure, the oil-absorbing sheet 1 includes a base sheet 10 and an oil-absorbing portion 1
By arranging 2 in a grid pattern, the oil absorbing parts 12 are configured to be distributed substantially evenly over the entire surface of the base material sheet 10. The oil absorbing parts 12 are an example of an oil permeable film for the oil absorbent 20. It is formed by surrounding it with a certain porous membrane 12a (see FIG. 2). Further, as shown in FIG. 2, in the present embodiment, the base material sheet 10 and the oil absorbing portion 12 are integrally formed, and the oil absorbing sheet 1 is a substrate having porous portions arranged in a lattice pattern. It is configured by laminating the material sheets 10 and 10.

Next, the materials of the above-mentioned members will be described. First, as the material of the base sheet 10, cellulose, polypropylene, polyethylene and nylon can be exemplified. Further, by applying water repellency treatment or the like to these materials to enhance waterproofness and prevent absorption of water, the oil absorbing sheet 1 becomes more difficult to be submerged in water. The oil absorbing agent 20 is not particularly limited, but a gelling agent such as polystyrene-polybutadiene block copolymer, polynorbornene, urethane and perlite, and other oil absorbing agents can be used. The size of the holes formed in the porous membrane 12a is sufficient if the oil absorbent 20 does not leak, but is typically 0.1 to 1 mmφ.
It is.

In the oil absorbing sheet 1 described above, for example, two porous base material sheets 10 are prepared, and one of the base material sheets is placed under a split mold having recesses arranged in a grid pattern. It can be manufactured by arranging it in a mold, filling an oil absorbing agent at a predetermined position (a part corresponding to the concave portion) from above, and then thermocompressing another base material sheet through the upper mold. When performing this thermocompression bonding, except for the concave parts of the mold (grid frame)
In the base material sheet portion which was in contact with, since the pores are closed, the porous portion is only the portion filled with the oil absorbent,
As described above, an oil absorbing sheet having a porous oil absorbing portion is obtained.

Next, the operation of this embodiment will be described.
In the present embodiment, the oil absorbing agent 20 comes into contact with the oil component via the porous membrane 12a and absorbs the oil component. This oil absorbent 20 is
Since the oil is selectively absorbed, the oil absorbing sheet 1 itself is less likely to be submerged. Further, by arranging the oil absorbing parts 12 in a grid pattern, the movement of the oil absorbing agent 20 is restricted by the oil absorbing parts 12 even if the oil absorbing sheet 1 is installed so as to be tilted and particularly to be supported and supported at one end. Therefore, the oil absorbing agent 20 is less likely to be omnipresent in the oil absorbing sheet 1 as a whole, and the oil absorbing ability can be exhibited over the entire oil absorbing sheet 1.

[0010]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. (Example 1) Polypropylene as a base sheet, polystyrene-polybutadiene block copolymer as an oil absorbent,
Oil absorbing sheet (50 cm × 50 cm, as shown in FIG. 1)
The number of oil absorption sites was 80, and the total amount of oil absorbent was 50 g). The oil absorbing sheet was placed in a container, and 420 g of B heavy oil was poured into the container. In this state, the oil-absorbent sheet was left to stand and the time-dependent change in the amount of oil absorbed by the heavy oil B was investigated, and the obtained results are shown in Table 1. From Table 1, it can be seen that this oil absorbing sheet absorbed almost all amount of B heavy oil in about 1 hour.

[0011]

[Table 1]

(Example 2) n-Hexane as an oil component was mixed with water to prepare an oil-water mixed liquid having an n-hexane content of 200 mg / l. The oil-water mixture obtained was filtered using the same oil-absorbing sheet as in Example 1.
-Hexane content was 4 mg / l. From this result, it is understood that the oil absorbing sheet of the present invention can be suitably used for oil / water separation.

(Embodiment 3) As in Embodiment 2, n-
An oil-water mixed solution having a hexane content of 500 mg / l was prepared, and this mixed solution was poured into a container. The mixture was allowed to stand for a while to allow the n-hexane content to float in the upper layer of the mixed solution, and then the same oil absorbing sheet as in Example 1 was placed and left for about 24 hours. Then, when the n-hexane content in the oil-water mixture was measured,
The n-hexane content was 50 mg / l, and it was found that 90% of the n-hexane content was absorbed by the oil absorbing sheet.

(Example 4) A base sheet was formed of various fibers shown in Table 2, and polystyrene-polybutadiene block copolymer was used as an oil absorbing agent to prepare oil absorbing sheets of sample numbers 1 to 4. The sizes and shapes of the obtained oil absorbing sheets are the same as in Example 1. Each oil-absorbing sheet was put into an oil-water mixed solution in which B-heavy oil was suspended and allowed to stand for 1 hour, and then the oil-absorption amount and the water-absorption amount of each oil-absorption sheet were measured, and the obtained results are also shown in Table 2. From Table 2, it can be seen that the oil absorbing sheet of the present invention hardly absorbs water.

[0015]

[Table 2]

The present invention has been described in detail above with reference to the embodiments and examples, but the present invention is not limited to this, and various modifications can be made within the scope of the gist of the present invention. For example, the arrangement of the oil absorbing portions is not limited to the lattice shape, and the distance between the oil absorbing portions may be adjusted to be substantially constant. Further, if the two-dimensional shape of the base material sheet and the two-dimensional shape of the oil absorbing portion are made to be substantially similar to each other, it is possible to distribute the oil absorbing portions substantially uniformly and to arrange them densely.

In the production of the oil-absorbing sheet of the present invention, it is not always necessary to perform thermocompression bonding, and the two base sheets may be stuck together with an adhesive or the like, and the two base sheets may be machined with a sewing machine or the like. You may stick together by stitching. Further, by making a perforation in a portion other than the oil absorbing portion of the oil absorbing sheet to form a cut line, the oil absorbing sheet can be divided into an appropriate size for use according to the application. Further, if the oil absorbing sheet of the present invention is wound into an oil absorbing sheet roll, it is convenient to handle.

[0018]

As described above, according to the present invention,
Since the specific material is appropriately used, it is possible to provide an oil-absorbing sheet that selectively absorbs oil and is unlikely to be submerged in water.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of an oil absorbing sheet of the present invention.

FIG. 2 is a partial cross-sectional view of the oil absorbing sheet shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Oil absorbing sheet, 10 ... Base material sheet, 12 ... Oil absorbing site, 12a ... Porous film, 20 ... Oil absorbing agent

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C09K 3/32 C09K 3/32 W

Claims (5)

[Claims] 1. An oil-absorbing sheet comprising an oil-absorbing portion provided on a base sheet, wherein the oil-absorbing portions are substantially uniformly dispersed on the base sheet, and an oil-absorbing agent is filled inside the oil-permeable film. An oil-absorbing sheet characterized by being configured as follows. 2. The oil absorbing sheet according to claim 1, wherein the oil permeable film is a porous film having pores to the extent that the oil absorbing material does not leak out. 3. The oil absorbing sheet according to claim 1 or 2, wherein the distance between the oil absorbing portions is substantially constant. 4. The oil absorbing sheet according to claim 1, wherein the oil absorbing portions are arranged in a lattice pattern. 5. The oil absorbing sheet according to claim 1, wherein the base sheet has water repellency.