JPH0938643A - Production of oil adsorbent and adsorbent for oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a production method of an oil adsorbent and the oil adsorbent that the adsorbent can be easily formed into a specified shape, production and handling of the adsorbent is made easy, inner vacancies of the adsorbent can be constantly formed, and oily material can be efficiently removed when the adsorbent is used in a flowing water. SOLUTION: Bark (b) is pulverized into a wood fiber 1 having a specified length, to which a core-sheath resin fiber 2 is mixed to form a specified shape. The formed body is heated to bind the wood fiber 1 with the core-sheath resin fiber 2 into one body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an oily adsorbent using wood fiber, especially unnecessary wood bark discharged during lumbering as a raw material.

[0002]

2. Description of the Related Art Conventionally, it has been known that it is effective to use wood bark to remove oils and fats in running water, oils and fats floating on the surface of water, and the like. Is a fibrous product obtained by subjecting a bark of wood to a process such as crushing, and a bag-shaped product formed by accommodating a predetermined amount in a bag of water-permeable mesh, cloth, non-woven fabric, etc. It was provided on the water surface to remove the above-mentioned fats and oils. (See JP-A-6-134299) However, since this oil adsorbent is obtained by simply packing the fibrous bark in a bag, the size and amount of the voids between the barks become gusset. Because it is not constant,
When installed in running water, the shape of the bag changes due to the pressure of the running water, or the bark moves inside the bag, and the desired effect is not obtained, and the water permeability is too good. May not exert sufficient oil adsorption force.

Further, in forming the oil adsorbent, since the fibrous bark was stored by hand in each bag,
The production efficiency is low, and a large quantity cannot be produced in a short time. There were various problems such as.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The bark is crushed into a wood fiber form having a predetermined length, and a core-sheath resin fiber is added to the wood fiber. By mixing and forming into a certain shape, and heating this to combine the wood fibers with the core-sheath resin fibers to integrate them, molding of a predetermined shape is simplified and manufacturing and handling are easy, and The formation of voids in the
It is an object of the present invention to provide a method for producing an oily adsorbent and an oily adsorbent capable of efficiently removing oil quality when used in running water.

[0005]

[Means for Solving the Problems] The means of the present invention for achieving the above-mentioned object is to crush tree bark into a fibrous wood fiber having a predetermined length, and a core-sheath resin fiber having a predetermined length. Is mixed to form a predetermined lump, and then heated to bond and integrate the wood fibers, which is a method for producing an oily adsorbent.

Further, the bark is crushed to obtain a fibrous wood fiber having a predetermined length, the wood fiber is subjected to a water repellent treatment with a water repellent, and the wood fiber and a core-sheath resin having a predetermined length are provided. This is a method for producing an oily adsorbent in which fibers are mixed and formed into a predetermined lump, and then heated to bond and integrate the wood fibers.

Further, the oily adsorbent comprises a wood fiber made of bark as a raw material and a core-sheath resin fiber connecting the wood fibers to each other.

A wood repellent made of bark may be impregnated with a water repellent.

[0009]

The present invention configured as described above has the following effects.

[0010] The bark is crushed to obtain a fibrous wood fiber having a predetermined length, and a core-sheath resin fiber having a predetermined length is mixed to form a predetermined block, which is then heated to form the wood fiber. An oily adsorbent is formed by combining and integrating.

When this is installed in, for example, running water in which oily substances are mixed, the water passes through the voids formed in the oily adsorbent from one side while receiving a certain resistance due to this flow. Water is permeable to the other side. At this time, oily matter in the water is adsorbed by the woody fiber when it comes into contact with it.

When the oily material floating on the water surface is placed on the watery surface by the oily adsorbent, the oily material is adsorbed by the wood fibers to remove the oily material. .

[0013]

EXAMPLE An example of the method for producing an oily adsorbent and the embodiment of the oily adsorbent according to the present invention will be described with reference to the drawings.

In FIGS. 1 and 3 to 5, A is an oily adsorbent capable of adsorbing and removing oily matter, which is basically composed of a wood fiber 1 and a core-sheath resin fiber 2. It

The above-mentioned wood fiber 1 uses waste bark discharged during lumbering such as cedar and cypress as a raw material b, and its own oil and fat exerts an affinity with other oils to produce water. It works by only seeing through and sucking oil,
1 to 10c of the material peeled from the wood is shaped by a shape forming means 3 such as a crusher by a hammer mill method, an impact crusher, or a crusher by a rotary cutter method.
Adjust the fiber length to about m.

At this time, foreign substances 5 such as powdered substances and mixed sand are removed from the crushed bark by a cylindrical rotary sieving and sorting machine 4 provided with a screen plate having a predetermined mesh. Then, make the fiber length uniform.

Further, by using the blower 6 in combination with the sieve sorter 4, the wood fiber 1 can be adjusted to a predetermined water content, for example, 30 to 40%.

When the wood fiber 1 requires water repellency, the wood fiber 1 may be impregnated with a water-emulsion water repellent 7 in this step. A water-soluble water repellent is added to the treatment tank 8 consisting of a tank.
After soaking in a solution adjusted to ~ 5% for 1 to 12 hours, drain the water and dry in a dryer 9 at 50 to 90 ° C.
When dried for about 1 to 4 hours, the emulsion wax component adheres to the entire surface of the wood fiber 1.

The water-repellent treatment may be carried out after the wood fiber 1 and the core-sheath resin fiber 2 are mixed, which will be described later, and after the bonding step.

The core-sheath type resin fiber 2 is the wood fiber 1
Binder fibers that connect the two to each other, using a conventional core-sheath type polyester fiber, and having a fiber diameter of 4 denier or less and not kinked are selected to obtain a homogeneous mixture in the mixing step described below. To be

Further, as shown in FIG.
High-melting polyester around 5 ° C is used, and the sheath material 11 is 1
A polyester having a low melting point of 00 ° C. to 130 ° C. is used, and the length thereof is about 0.5 to 10 cm, and is appropriately selected according to the situation of the oil removing portion.

The wood fiber 1 and the core-sheath resin fiber 2 are uniformly mixed by a mixing and agitating machine 12. The mixing and agitating machine 12 comprises a rotatable inner frame and a rotatable stirring rod inside thereof. The mixed fiber 13 is obtained by blending by a predetermined rotation.

This mixing ratio is such that the greater the amount of the core-sheath type resin fibers 2, the greater the binder effect is obtained. However, when the amount of the wood fibers 1 is small, the oil adsorption capacity is lowered, and the wood fibers 1 and the core-sheath are mixed. The ratio with the mold resin fiber 2 is 19: 1
7: 3 is suitable, and the ratio also varies depending on the lengths of the fibers 1 and 2 used.

The mixed fiber 13 is formed into a predetermined lump, and the forming step is as shown in FIG.
It is accommodated in a mold 14 having an arbitrary shape such as a square shape, a circular shape, or a polygonal shape, and sent to the next step, or, as shown in FIG.
The mixed fibers 13 from 2 are naturally dropped to form a deposited layer 13a having a predetermined thickness. As shown in the figure, the continuous deposited layer 13a has a square shape and a mat-like shape with a predetermined size. Although not shown in the drawing, the single shape, which is not shown, is formed into a predetermined rectangular shape and is naturally dropped.

After the above-mentioned continuous deposition layer 13a has undergone the bonding step, which will be described later, as shown in FIG. 5, cutting and punching by a die cutting means 20 such as a press machine are performed to obtain a molded product A. In addition, in this molding step, the suction means 1 is provided below the receiving means 15 in order to improve its shape retention.
6 are provided in pairs and are machined into a predetermined shape and a predetermined hardness by this vacuum. Depending on the strength and time of the vacuum, the hardness after molding or the size and amount of the voids 17 formed inside can be adjusted. That has an impact,
Although not shown, a certain molding may be performed by an automatic or manual press.

In this way, the predetermined shape does not lose its shape in the joining step, and the predetermined void 1 is formed.
Since it is processed so as to have 7, it is performed by the connecting means 18.

In the joining step, the sheath material 11 of the core-sheath type resin fiber 2 is melted by heating and entangled with the wood fibers 1 to connect the wood fibers 1 to each other, and a predetermined synergistic effect with the core material 10 is obtained. To exert the strength of, for example,
A conventional connecting means 18 such as a hot air dryer or a hot press machine is adopted. In the case of the hot air dryer 18, the mat-shaped product formed in the above step is accommodated in this tank, and 100 to 150 is used. The sheath material 11 is melted by supplying hot air for 10 to 60 minutes at a temperature of ° C.

When using the hot press machine 18,
In order to obtain the oily adsorbent A, which is a molded product having a specific gravity of less than 0.1, which is melted by pressurizing at a temperature of 100 to 150 ° C. for about 10 to 60 minutes, a hot air dryer is used. In order to perform heat treatment at 130 ° C. for 30 minutes and obtain a molded product having a specific gravity of 0.1 or more, heat treatment is performed at 150 ° C. for 10 minutes with a hot press machine.

This specific gravity value has a great influence on the degree of void (density) in the oily adsorbent A, and is appropriately selected according to the intended use of the oily adsorbent A.

Next, an example in which the performance test of the oily adsorbent A molded according to the above-mentioned embodiment is conducted will be shown.

The cedar bark is crushed by a crusher to obtain a wood fiber, and the wood fiber and the core-sheath type polyester fiber are aligned to have a fiber length of 3 cm by a mixing stirrer. Mixed fibers were obtained with a fiber ratio of 9: 1.

This mixed fiber was filled into a 32 cm × 34 cm bottomless mold by gravity drop so as to be uniform, and lightly formed by hand press.

This was heated in the bonding step and removed from the mold to obtain a first sample oily adsorbent.

Further, the wood fiber was subjected to water repellent treatment with a water emulsion water repellent agent, mixed with the core-sheath type polyester fiber in the same manner, and a second sample oily adsorbent was obtained by a bonding step.

Then, both the first and second samples were immersed in heavy oil A for 5 minutes, then drained for 4 minutes, the oil adsorption weight was measured thereafter, immersed in water for 5 minutes, and then immersed in water for 4 minutes. Was cut, and the weight of water adsorbed thereafter was measured.

The first sample had a large A heavy oil adsorption amount,
Although it was good enough to reach the intended purpose, it was not sufficient as a result because of the large amount of water adsorbed. The second sample had a large amount of A heavy oil adsorbed and a small amount of water adsorbed as compared with the first sample, and thus was good enough to be used sufficiently.

In the case of an oily adsorbent having a specific gravity of 0.07, A
Heavy oil adsorption amount 3g / g or more, water adsorption amount 0.01g / g or less, tensile strength 3N / cm ² or more, water permeability coefficient 0.18cm
/ Sec performance was obtained.

Next, both the above-mentioned first and second samples are
The fiber length of wood fiber is 1-3 cm, 3-5 cm, 5
It was adjusted to 10 cm, treated with a water repellent, and the relationship between each specific gravity and the heavy oil adsorption amount was determined.

The results are shown in FIG. 6, and the best result was obtained for the oily adsorbent made of wood fibers having a fiber length of 1 to 3 cm.

Furthermore, an oily adsorbent made of wood fibers having a fiber length of 1 to 3 cm was prepared, and the results of comparison between the case where the water repellent treatment with the water repellent was not performed and the water repellent treatment were performed. The relationship between the specific gravity and the amount of heavy oil A adsorbed was determined, and the results are shown in FIG. 7.

As shown in FIG. 7 (a), the adsorbed amount of A heavy oil per gram decreases as the specific gravity increases, and as shown in FIG. 7 (b), the adsorption of A heavy oil per cm ³ The amount increased as the specific gravity increased.

[0042]

As described above, according to the method for producing an oily adsorbent and the oily adsorbent of the present invention, the wood fiber and the core-sheath resin fiber are mixed and heat-treated to carry out the oil adsorption work. The required shape can be easily manufactured, and since it has a predetermined shape-retaining force, it can be easily handled during the oil adsorption work.

Since the voids formed inside are made constant, it is possible to efficiently remove oil quality without receiving the resistance of running water when it is used in running water. And so on.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing process of an example of an oily adsorbent in which an oily adsorbent manufacturing method according to the present invention is carried out.

FIG. 2 is a perspective view in which a part of the core-sheath resin fiber in FIG. 1 is cut away.

FIG. 3 is a perspective view showing a part of an oily adsorbent formed by the step of FIG. 1 in a cutaway manner.

FIG. 4 is an explanatory view showing another example of the joining step in FIG.

FIG. 5 is an explanatory view showing an example in which the oily adsorbent in FIG. 1 is formed by punching.

FIG. 6 is a graph showing an experimental example using a plurality of fiber lengths in the oily adsorbent in FIG.

FIG. 7 is a graph showing the proportionality of the oil-based adsorbent in FIG. 1 with and without water repellent treatment.

[Explanation of symbols]

 b Bark 1 Wood fiber 2 Core-sheath resin fiber 7 Water repellent

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location C09K 3/32 ZAB C09K 3/32 ZAB (71) Applicant 592199548 Chubu Shintokai Felt Shizuoka Prefecture 33-14 Funakoshi-cho, Hamamatsu City (72) Inventor Tadahiko Miyamoto 2078 Makigaya Shizuoka City Shizuoka Shizuoka Industrial Technology Center (72) Inventor Satoshi Sakuragawa 2078 Makigaya Shizuoka City Shizuoka Industrial Technology Center (72) Inventor Yasunobu 2078 Makigaya Shizuoka Shizuoka Shizuoka Industrial Technology Center (72) Inventor Sumio Ida 2310 Makigaya Shizuoka Shizuoka Shizuoka Lumber Cooperative Association (72) Inventor Yamada Kinju Aichi 1 8 Takanedai, Fukuzumi, Akui-cho, Chita-gun, Chiba Prefecture (72) Inventor, Koji Matsushita Funakoshi, Hamamatsu City, Shizuoka Prefecture Number 33 in the No. 14 Co., Ltd. unit and new Tokai within the felt

Claims (4)

[Claims] 1. A crushed bark to form a fibrous wood fiber having a predetermined length and a core-sheath resin fiber having a predetermined length are mixed,
A method for producing an oily adsorbent, which comprises forming a predetermined lump and then heating to bond and integrate the wood fibers. 2. A bark is crushed to obtain a fibrous wood fiber having a predetermined length, the wood fiber is subjected to a water repellent treatment with a water repellent, and the wood fiber and a core-sheath resin having a predetermined length are provided. A method for producing an oily adsorbent, which comprises mixing the fibers with each other to form a predetermined lump and then heating to bond and integrate the wood fibers. 3. An oily adsorbent characterized by comprising wood fibers made of bark as a raw material, and core-sheath resin fibers connecting the wood fibers to each other. 4. An oily material comprising wood fibers made of bark as a raw material, a water repellent impregnated in the wood fibers, and a core-sheath resin fiber connecting the wood fibers to each other. Adsorbent.