JPH07100376A - Oil adsorption mat - Google Patents

Abstract

PURPOSE:To provide an oil adsorption mat having excellent oil adsorption efficiency and from which an oil adsorbent does not fall off. CONSTITUTION:In the oil adsorption mat, an oil adsorbent 1 is held there between two-layered hydrophobic nonwoven fabrics 3 whose outer peripheral parts are sealed, and separated with checkboard form dot-like seal parts 2 and the dot-like seal part 2 consists of the dot-like seal in which seal points in a circular form with 0.5-3mm diameter or a quadrilateral form with 0.5-3mm side length are arranged with a space of 1.5-5mm center distance.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an oil adsorption mat.
Specifically, oil floating on the water surface, oil mixed with water,
The present invention relates to an oil adsorption mat used for efficiently adsorbing oil content spilled on a floor surface or the like.

[0002]

2. Description of the Related Art In recent years, there has been an increasing tendency to preserve the global environment. From that point of view, environmental damage due to oil pollution of the ocean, rivers, lakes and marshes caused by oil discharged from ships, factories, general households, etc. has become a problem. In order to prevent this oil pollution, various methods of adsorbing and removing the discharged oil have been proposed.

For example, Japanese Unexamined Patent Publication (Kokai) No. 60-179138 proposes an adsorbent such as oil in which a solid oil gelling agent is mixed with each fiber in a fused state in a fiber adsorbent.
However, since the adsorbent is a mixture of a fibrous adsorbent and a solid oil gelling agent, which are mixed together, the oil gelling agent undergoes thermal deterioration due to heat fusion, or causes a shape change or the like. There is a drawback that the adsorption performance decreases.

In Japanese Utility Model Application Laid-Open No. 4-57293 (Japanese Patent Application No. 2-100134, Microfilm), there are two upper and lower parts.
A non-woven sheet made of hydrophobic fibers is bonded to each other with an oil-absorbing gel particle body sandwiched between them, or the non-woven sheet made of hydrophobic fibers is dispersed and held in the non-woven sheet. Has been proposed. However, the oil adsorbent is a so-called point-bonding method in which a method of sandwiching the oil-absorbent gel particles in the middle of the non-woven sheet or a method of holding the oil-absorbent gel particles in the non-woven sheet is needle punching. Therefore, there is a drawback that the oil-absorbent gel particles are dropped from the end of the oil adsorbent during transportation and use, and the oil gelling agent is not only lost but also the surroundings are contaminated. When the oil is adsorbed and then dropped off, a problem of secondary pollution occurs and it cannot be said to be a satisfactory oil adsorbent.

Further, the oil adsorbent that has been put to practical use in the past is a relatively large bag filled with the oil adsorbent.
Since such an oil adsorbent has a thick layer of the oil adsorbent present therein, it has a drawback that it easily causes a mamako phenomenon when adsorbing oil.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an oil-adsorbing mat that efficiently adsorbs oil and does not drop off the oil adsorbent.
Specifically, the oil gelling agent does not fall off from the hydrophobic non-woven fabric that is the carrier, does not cause the Mamako phenomenon when adsorbing oil, and the surface of the oil gelling agent and / or the hydrophobic non-woven fabric is An object of the present invention is to provide an oil adsorption mat that does not melt and the adsorption performance does not deteriorate.

[0007]

Means for Solving the Problems As a result of intensive studies, the present inventor has filled and sandwiched an oil adsorbent between two layers of non-woven fabric having a sealed outer peripheral portion, and compared them with a dot seal. The inventors have found that the above-mentioned object can be achieved by separating into a very small amount, and have reached the present invention.

That is, the present invention is an oil adsorption mat in which an oil adsorbent is sandwiched between two layers of hydrophobic non-woven fabric whose outer peripheral portion is sealed, wherein the oil adsorbent is separated by a checkerboard-like dot-shaped seal portion. And the point-shaped seal portion has a diameter of 0.5 to
A 3 mm circular or quadrilateral seal point having a side length of 0.5 to 3 mm, which is a point-like seal disposed at a center-to-center distance of 1.5 to 5 mm. .

The oil adsorbent mat of the present invention is characterized in that the oil adsorbent is filled and sandwiched between the two layers of the hydrophobic non-woven fabric in small amounts, and that the oil adsorbent is separated by dots. Is being done by.

By adopting the above-mentioned structure, it is possible to reduce the thickness of the mat and prevent the oil adsorbent from causing the mamaco phenomenon when adsorbing the oil component. In addition, the thinning of the mat makes it possible to reduce costs for packaging, storage, transportation and the like. By adopting the above configuration, it is possible to prevent the shape change of the nonwoven fabric and / or the oil adsorbent due to melting or the like, and prevent the deterioration of the oil adsorption performance of the nonwoven fabric and / or the oil adsorbent. In addition, when the oil adsorption mat is used, it can be cut from the dot-shaped seal portion, and the size of the oil adsorption mat can be appropriately adjusted.

The oil adsorption mat of the present invention will be described in detail below. The hydrophobic non-woven fabric used in the present invention is not particularly limited in its material and may be any one that is usually used as an adsorbent for oil and the like. Preferably, it floats on the water surface, absorbs oil but does not absorb water, does not pass through the oil adsorbent, does not fall off, has appropriate strength, does not inhibit the bonding action, does not generate harmful gas when incinerated, etc. It has a function. Examples of these materials include a nonwoven fabric made of a hydrophobic resin fiber selected from polyolefin fiber, polyester fiber, and polyamide fiber. Specific examples thereof include non-woven fabrics made of polypropylene fiber, polyethylene fiber, polyethylene terephthalate fiber, nylon fiber and the like, and these may be used alone or in combination of two or more kinds.

As the fiber structure, a single structure, a core-sheath structure,
Side-by-side structure and the like, fiber denier,
The thread diameter can be appropriately selected. The non-woven fabric made of hydrophobic fibers includes non-woven fabrics composed of a single layer or multiple layers of the above-mentioned hydrophobic fibers, the apparent bulk density of which can be appropriately selected, and which is produced by a known method. The method for producing the non-woven fabric is not particularly limited, a web is formed from fibers, and a known method, for example,
Needle punch method of entangled by needle, spunbond method of entangled by direct spinning, embossing method of entangled by thermal embossing, stitch bond method of entangled by yarn,
Examples of the method include a jet bond method in which water is entangled, a thermal bond method in which heat is entangled, and a resin bond method utilizing resin adhesion.

The basis weight of the non-woven fabric is 20 to 200 g
/ M ² is generally used, but considering strength, economy, etc., it is preferably 40 to 120 g / m ² .

Examples of the oil gelling agent used in the present invention include hydroxystearic acid type, styrene-butadiene copolymer type, perlite type and acrylic acid type powders, granules, flakes and fibrous substances at room temperature. To be These may be used alone or in combination.

The oil-adsorbing mat of the present invention is one in which the oil-adsorbing agent is separated and filled in and sandwiched between the two layers of the nonwoven fabric. When a large amount of oil adsorbent is present in one place, when adsorbing oil, a layer to be adsorbed is formed only on the surface and it becomes difficult to be adsorbed inside, causing a so-called Mamako phenomenon. In order to prevent such a phenomenon, it is important that the oil adsorbent is separately filled and sandwiched between the two layers of non-woven fabric in small amounts. From this point of view, in the present invention, it is preferable that the oil adsorbent is separately filled and sandwiched by 0.05 to 5 g. More preferably, it is 0.1 to 3 g.
Depending on the type of the oil adsorbent, the adsorption capacity, the shape such as the particle size, etc., the amount to be separated, filled and sandwiched is appropriately selected from the above range. If the separation unit of the oil adsorbent is large, the oil adsorbent layer existing in the oil adsorption mat will become thicker, and it will be difficult to evenly adsorb the oil to the inside. It is easy to wake up. Considering this phenomenon, it is preferable that the separation unit is within the above range.

[0016] The oil adsorbent is separated and filled into the above-mentioned amount,
The size of each point-shaped seal portion to be sandwiched, that is, the size of the flat bag-like material into which the oil adsorbent is separately filled is
Although it varies depending on the type of oil adsorbent, bulk specific gravity, type and amount of oil to be adsorbed, etc., the perimeter is preferably 10 to 35 cm. More preferably, it is 10 to 25 cm.
The perimeter means the total value of the lengths of the sides in the case of a quadrangle, for example, and the length of the circumference in the case of a circle. Considering the ease of dot-like sealing, the preferred shape is a quadrangle such as a square, a rectangle, or a rhombus. More preferably, it is a square or a rectangle. Examples of the square having a perimeter of 10 to 35 cm include a square having one side of 2.5 to 8 cm.

The number of the above-mentioned dot-like seal portions in the oil adsorption mat of the present invention is not particularly limited, but in consideration of easiness of transportation, use and post-treatment of the oil adsorption mat, it is generally vertical. It is preferable that two to fifteen pieces are continuously formed in each of the direction and the lateral direction. That is, the oil adsorbent mat of the present invention is preferably a square or rectangular oil adsorbent mat having a length and width of 4 to 120 cm. When a mat with a large number of separated points is used in a narrow space, it is convenient to cut the mat from the seal and use a relatively small mat.

The method of filling and sandwiching the oil adsorbent between the two layers of non-woven fabric is not particularly limited, but a predetermined amount of the oil adsorbent is left in a predetermined amount while leaving a sealing margin at the end of one non-woven fabric. An example is a method of regularly placing them in a grid pattern at intervals, covering them with another non-woven fabric, and then sealing the portion where the oil adsorbent is not placed in a dot shape.

In the present invention, the point-like sealing means that the sealing line is discontinuous. The details of the dot-shaped seal portion will be described later in detail by exemplifying the drawings, but the dot-shaped seal portion may be composed of one dot-shaped seal line or plural dot-shaped seal lines. . It is preferably sealed by a plurality of dot-shaped seal lines.

The oil adsorption mat of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic plan view showing an example of the oil adsorption mat of the present invention. FIG. 2 is a schematic sectional view showing an example of the oil adsorption mat of the present invention. As shown in the figure, the oil adsorbent 1 has two layers of hydrophobic nonwoven fabrics 3 and 3 '.
It is sandwiched by the ridges and separated by the dot-shaped seal portion 2 in small amounts. The dot-shaped seal portion 2 may be composed of one dot-shaped seal line or may be composed of a plurality of dot-shaped seal lines, but the latter is preferable.

Examples of the shape of the seal point include a circle, an ellipse, a square, and a rectangle. The size of each seal point in the point seal part 2 is the diameter of the seal point or the length of one side from the viewpoint of preventing changes in the shape of the non-woven fiber, peeling of the seal part, breakage, drop-off of the oil adsorbent, etc. Is 0.5
It is selected from the range of 3 mm. The distance between the seal points is selected from the range of 1.5 to 5 mm in the distance between the centers of the seal points. When multiple point seals are provided, the distance between the seal lines is 1.5 to the center distance of the seal points.
It is preferably about 5 mm.

FIG. 3 is a schematic view showing an example of a detailed structure of the dot seal portion 2. The dotted seal portion 2 illustrated in FIG. 3 is composed of three dotted seal lines. Specifically, the square seal points each having a side length of 2 mm (perimeter length 8 mm) have an interval of 2 mm (the center distance between the seal points is 3 mm).
mm), three seal lines are provided at intervals of 2 mm (distance between centers of seal points is 3 mm), and the entire width of the point-shaped seal portion 2 is 10 mm.

As a method of forming the point seal portion 2, a known joining method can be adopted. For example, a heat fusion method, an ultrasonic bonding method, a high frequency welder bonding method, an adhesive bonding method and the like are exemplified. In addition, a needle punch method can also be used. In producing the oil-adsorbing mat of the present invention, it is preferable that the dot-like sealing is carried out by the above method with the oil adsorbent 1 not present in the dot-like sealing portion 2.

By separating the oil adsorbent by the point-like seal, it is possible to suppress the deformation of the fibers constituting the nonwoven fabric to an extremely small portion. For example, when the front surface is planarly sealed, the fibers constituting the non-woven fabric are melted or formed into a sheet by an adhesive, and the sealing portion loses the capillary action, whereas the point-like sealing as in the present invention causes the capillary action. It is possible to suppress the portion that loses to a very small portion. Therefore, the oil-adsorbing mat of the present invention has an excellent oil-adsorbing ability even in the point-like seal portion. Moreover, since the dot-shaped seal portion has the above-described structure, the oil adsorbent can be prevented from falling off.

[0025]

EXAMPLES Hereinafter, examples will be described in more detail. However, the present invention is not limited to the following examples. Example 1 Polyethylene-polyester composite fiber spunbonded nonwoven fabric (manufactured by Unitika Ltd., trade name: Elves, fabric weight: 7)
0 g / m ² ) was cut into a length of 28.5 cm and a width of 28 cm to prepare two non-woven fabrics having the same size. One of them is placed horizontally, and a styrene-butadiene copolymer oil adsorbent (Shichemifa Corporation, trade name: Sigel) is placed on top of it.
Each 0.7g is 5.5cm in the vertical direction and 4.5c in the horizontal direction.
An equal amount of each was placed at equal intervals of m, and another non-woven fabric was laid on top of it so that the ends fit together. Then, using a heat-bonding trowel, spot heat seal (seal point diameter:
2 mm, 3 mm dot-like seal lines with an interval of 2 mm are provided at 2 mm intervals (see FIG. 3), and the outer peripheral portions of the two non-woven fabrics are heat-sealed in the same manner to form an oil gelling agent 0.
7g is 5.5cm in length and 5cm in length at intervals of 4.5cm in the horizontal direction
Thus, an oil adsorption mat was obtained, in which 6 pieces were horizontally separated and 6 pieces were horizontally arranged (total amount of oil adsorbent: 21 g). The thickness of the oil adsorption mat is 4
It was mm. Using the obtained oil adsorption mat, adsorption of oil floating on the water surface and gelation test were conducted by the following methods.

<Floating oil adsorption / holding test> Diameter 68 cm
Water is put in the water tank of No. 1, 150 g of heavy oil A is suspended on the water surface, one of the obtained oil adsorption mats is charged, and the water surface is left for 1 hour while vibrating. Then, one corner of the oil adsorption mat is grabbed, suspended in the air and drained for 30 minutes to measure the increase in the weight of the oil adsorption mat. As a result, the weight increase of the oil adsorption mat was 122 g. Further, during this test, the particles of the oil adsorbent and the oil adsorbent after adsorption did not drop off from the end of the oil adsorption mat. Furthermore, after the test was completed, the oil-adsorbing mat was cut and the oil-adsorbing agent was observed.

Comparative Example 1 21 g of the oil adsorbent was formed from two non-woven fabrics having a length of 28.5 cm and a width of 28 cm without point-sealing the oil adsorbent into 5 pieces in the lengthwise direction and 6 pieces in the widthwise direction. An oil-adsorbing mat was obtained in the same manner as in Example 1 except that the above-mentioned bag was filled. The thickness of the oil adsorption mat was 6 mm. A floating oil adsorption test was conducted in the same manner as in Example 1 using the obtained oil adsorption mat. As a result, the weight increase of the oil adsorption mat was 96 g. Also,
After the test was completed, when the non-woven fabric of the oil-adsorption mat was cut and the oil gelling agent was observed, the Mamako phenomenon was partially observed.

Comparative Example 2 A test was conducted in the same manner as in Example 1 except that the oil adsorbent was separated by heat-sealing the entire seal portion with a plane seal having a width of 1 cm. As a result, the weight increase of the oil adsorption mat is 116g.
The adsorption performance was not good as compared with Example 1.
Mamako phenomenon of the oil gelling agent was not observed.

[0029]

EFFECTS OF THE INVENTION In the oil adsorption mat of the present invention, since the oil adsorbent is separately filled and sandwiched between the two layers of the hydrophobic non-woven fabric, the oil adsorbent causes the mamaco phenomenon when adsorbing the oil component. It does not occur and has good adsorption efficiency. Further, since the oil adsorbent is separated by the dot-shaped seal, there is no change in the shape of the nonwoven fabric and / or the oil adsorbent due to melting of the seal portion, etc., and the oil adsorption performance of the nonwoven fabric and / or the oil adsorbent is good. . Furthermore, since the dot-shaped seal is composed of specific sealing points, it is possible to transport, use, post-process, etc. the oil adsorption mat,
The oil adsorbent does not fall off and there is no risk of secondary contamination. In addition, the size of the mat can be appropriately adjusted by cutting from the dot-shaped seal portion at the time of use.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an example of an oil adsorption mat of the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of the oil adsorption mat of the present invention.

FIG. 3 is a schematic diagram showing an example of a detailed structure of a dot-shaped seal portion.

[Explanation of symbols]

 1 Oil adsorbent 2 Point-shaped seal part 3 Hydrophobic non-woven fabric 3'hydrophobic non-woven fabric

Claims (3)

[Claims] 1. An oil adsorption mat in which an oil adsorbent is sandwiched by two layers of non-woven fabric having a sealed outer peripheral portion, wherein the oil adsorbent is separated by a grid-like point-like seal portion, The point-shaped seal part is a circular seal having a diameter of 0.5 to 3 mm or a quadrilateral seal point having a side length of 0.5 to 3 mm, which is arranged at a center-to-center distance of 1.5 to 5 mm. An oil adsorption mat that is characterized by 2. The separation perimeter of each cross-shaped point seal portion is 10 to 35 cm, and the number of separations is 2 to 15 in each of the vertical and horizontal directions.
The described oil adsorption mat. 3. The oil adsorbent mat according to claim 1, wherein the oil adsorbent is separated and sandwiched between 0.05 and 5 g.