KR101281790B1 - Oil absorbent using hydorphobic film - Google Patents

Abstract

The present invention uses a hydrophobic film to form a multi-layer structure that facilitates the movement of liquid materials, so that even when mixed with water, oil can be adsorbed and removed with high efficiency, and can be reused. It relates to an adsorbent. The oil-adsorbing material according to the present invention is characterized in that it comprises a multi-layered structure in which the hydrophobic film having a contact angle of 45 ° or more at room temperature is spaced apart at intervals of 10 μm to 20,000 μm.

Description

Oil-absorbent of multi-layer structure using hydrophobic film {Oil absorbent using hydorphobic film}

The present invention relates to an oil-adsorbent, and more particularly, by using a hydrophobic film to form a multi-layer structure in which a liquid material is smoothly moved, even when mixed with water, oil can be adsorbed and removed with high efficiency and reused. The present invention relates to a new type of high efficiency oil absorbent material having high economical efficiency.

Liquid oil may be classified into crude oil, fuel oil such as heavy oil, machine oil such as lubricating oil, and edible oil such as animal fat and vegetable oil. Since oil has a relatively low surface energy, a low density, and does not dissolve in water and is not mixed with water, oil can be easily separated using a liquid / liquid separator that separates the mixture by using a difference in specific gravity even if it is mixed. Substance.

However, unlike the case where water and oil are mixed in a container, the oil is separated from the frequently encountered mixture of water and oil, such as an actual oil spill, a river pollution caused by the discharged oil, and oil generated when cooking food. The process of doing so is a time-consuming and labor-intensive task due to its low efficiency.

This is because oil spilled in the ocean or stream has a relatively low surface energy and is widely dispersed without being present in the mixed state with water, so that a small amount of oil is widely dispersed in a short time, and This is because the flow of water, such as waves and streams, exists in the river environment, which further accelerates the dispersion of oil in the upper part.

On the other hand, in the case of food, water and solids other than oils are included in most cases. Therefore, oil is present in the state of being adsorbed to solids not only on the surface of the water but also inside, and mixing water and oil through the cooking process. In addition to the external force to be applied, the viscosity of the water is increased by the gelatinized starch, water-soluble protein and various sugars, the oil is mixed in the water due to the difference in density, the process of floating is separated slowly.

In addition, since various additives such as salts and sugars are dissolved in the food, the surface energy of the water is lowered, so that it is not only easier to mix with oil, but also foods containing water are often consumed in a warm state. Higher temperatures also cause water to flow and lower the surface energy of the water, making it difficult to separate oils with low surface energy.

As such, the technology to effectively control the environmental pollution caused by the leakage of oil or to easily remove the oil content of high calorie foods containing excessive oil is a useful technique that is frequently required, and to effectively remove the oil from the liquid mixture of oil and water. This involves technical challenges of lowering efficiency.

Such a method of separating water and oil includes a method of separating water and oil by using a difference in specific gravity between water and oil, a method of mixing water and oil by using a surfactant, and removing oil by using an sorbent. After adsorption, it may be classified into a method of removing together with the oil adsorbent.

The method using the separation facility is difficult to apply due to the low efficiency as mentioned above, and the method using the surfactant has the advantage of obtaining a quick result, but it is not only the decomposition of oil due to the microbial action of water, It is pointed out that the surfactant can cause secondary environmental pollution.

Recently, as an alternative to this, a method of adding a recoverable oil adsorbent to a mixture of water and oil has been attracting attention, and recently, the development of high performance oil adsorption material and environmentally friendly oil adsorption material have been received. Research to develop is actively in progress.

For example, US Pat. No. 67,70285 introduces a technique for producing a heterogeneous oil adsorption composition in the form of a film, particles, or an emulsion prepared by adding a lipophilic monomer to the surface of an article having a lipophilic surface characteristic. 62-3752 introduces an environmentally friendly porous oil-absorbing material with a high surface area which is prepared by swelling starch and then lyophilizing.

In addition to new adsorption materials for adsorbing oil, research is being actively conducted to improve adsorption efficiency. US Pat. No. 62,998,67 coats and absorbs gel formation on porous activated carbon, or gels. Introducing porous sorbent material obtained by freeze-drying the formations. The composition of gel-forming products is excellent in removing not only oils contained in food but also harmful substances such as heavy metals and pesticides. have.

On the other hand, US Pat. No. 5834385 introduces an oil sorbent for controlling an oil spill accident that is prepared by mixing a sorbent and a cellulose fiber to fill a body made of a nonwoven fabric.

In this conventional research, in order to effectively remove oil in a mixture of water and oil, the adsorption of oil is performed by preparing a porous material or forming fine pores using a lipophilic material that is fibrous, that is, lipophilic. The research is focused on increasing the surface area of materials.

However, most synthetic resins widely used in industry except polydimethyl siloxane, polytetrafluoroethylene and polyethersulfone are wetted with water with a contact angle of less than 90 degrees. . In addition, in the actual environment in which the sorbent is required, the mixture is mostly a small amount of oil and most of the water, so the oil and the water are likely to be absorbed together during the initial addition of the sorbent. At this time, the water absorbed in the sorbent absorbs the pores of the sorbent so that it not only interferes with the adsorption process of oil, but also hinders the penetration of the liquid material into the sorbent, thereby significantly reducing the sorbent efficiency.

There may be a method of increasing penetration of the sorbent material to facilitate the penetration of the liquid substance, but in this case, the surface area of the bulk or fibrous sorbent material is reduced, so that high oil removal performance is not expected, and the structure of the sorbent material is poor. This causes a problem of low strength. Here, the low-strength sorbent material has a high possibility of breakage, so it is hard to be used in an environment in which external forces such as the ocean and rivers are applied, and there is a possibility that the low-density sorbent may contaminate food when applied to food.

In addition, there is a problem that the excess moisture and oil present in the inside of the adsorption material continuously flows during the removal process in the process of removing after using the porous adsorption material is not clean.

During the process of applying the porous oil-adsorbent prepared by using the existing fibrous material to promote the movement of the material to the inside of the oil-adsorbent through the method of immersing after the immersion to remove excess water and then immersing again, It may be possible to improve the oil adsorption efficiency, but in this case, since the repetitive action of the external force or the process of repeating dehydration and immersion proceeds similarly to the washing operation, there is a limitation in that the oil adsorbed is also accompanied.

Adsorbents and adsorbents that can adsorb such a large amount of oil have been developed, but they have high utility in environments where actual adsorbents are required, that is, in the form of a mixture of a large amount of water and a small amount of oil. The sorbent is still unknown.

An object of the present invention is to solve the problems of the conventional oil adsorption material or oil adsorption material and to provide a high efficiency oil adsorption material having the following characteristics simultaneously.

구조) structure that can quickly adsorb a small amount of oil

Ii) the ability to reliably capture large amounts of oil

Iii) structure that liquid material can be easily moved from inside to outside or from outside to inside of sorbent

Iii) Ability to selectively adsorb only oil with high selectivity

Iii) Sufficient strength and durability to withstand a variety of applications

In the present invention, the fact that even the same material can control the adhesion between the liquid and the solid according to the form of the pore differently, that is, the circular pores increase the adhesion of the water, on the contrary, in the pores of the rectangular shape, the adhesion of the water is significantly reduced It has been conceived from the fact that it can be lowered to complete the present invention providing a new type of sorbent.

Therefore, the oil absorbent according to the present invention,

Hydrophobic film having a contact angle with water of 45 ° or more at room temperature is characterized in that it comprises a multi-layered structure spaced apart at intervals of 10㎛ to 20,000㎛.

That is, the oil-adsorbent according to the present invention arranges the hydrophobic films at regular intervals to facilitate the material movement of the liquid material, and at the same time provides a large surface area provided from the multilayer hydrophobic films to select a small amount of oil with high efficiency. Can be adsorbed.

The reason why the hydrophobic film used in the present invention assumes that the contact angle with water is 45 ° or more is less than 45 ° because the adhesive force with water is superior and the selective adsorption capacity of oil is lost. The hydrophobic film having a contact angle of 45 ° or more is formed of a synthetic resin material such as polyethylene terephthalate, polypropylene, polyethylene, or the like in which one or more synthetic resins are adhered and mixed to form a film. Water at room temperature, such as coated with a film made of synthetic resin such as polyolefin terephthalate, polypropylene, polyethylene having a contact angle of 45 ° or more on the outside of a sheet-like material such as paper, nonwoven fabric or fabric A film made of a hydrophobic synthetic resin having a contact angle of 45 ° or more and a film formed by coating the synthetic resin on the outside of the sheet-like material can be used.

The hydrophobic film needs to be spaced apart from each other at intervals of 10 μm to 20,000 μm, which means that even when using a hydrophobic film such as polyethylene having a contact angle of 88 ° from water at room temperature, adhesive force with water is present. When the hydrophobic films are arranged at narrow intervals, the movement of materials is not smooth. If the gaps are too wide, the volume is enlarged, making the handling difficult and relatively inefficient in removing oil. Therefore, it is preferable to select an interval in which the material movement can be appropriately made in accordance with the viscosity of the oil and the viscosity of water or the mixture containing water within the above range.

On the other hand, as a method of forming a gap between the hydrophobic film, a spacer having a thickness corresponding to the desired spacing (spacer) is inserted between the spaced apart hydrophobic films, or the hydrophobic film itself is not smooth surface without irregularities By laminating | stacking using this thing, the method of forming a space | interval by unevenness | corrugation can be used.

In addition, in the form of the oil-adsorbing material according to the present invention including a structure in which the hydrophobic films are spaced at predetermined intervals, two or more hydrophobic films are laminated and arranged so as to have a multilayered plate-like structure. And having two or more hollow cylinders or polygonal cylinders of the hydrophobic film arranged in a multi-layered structure, and among these, the form having a multi-layered plate structure free of movement of liquid materials is most preferred. desirable.

However, the method of forming the gap between the hydrophobic films or the form of the oil-adsorbing material exemplifies preferred embodiments and the present invention is not limited to the above forms.

On the other hand, the hydrophobic film used in the present invention preferably has a thickness of between 5㎛ 3,000㎛. If the thickness of the film is too thin, it is difficult to maintain the shape, and if it is too thick, the cost increases, the volume and the weight increase, making the handling difficult and the relatively low removal efficiency of the oil.

High-efficiency sorbent material of multi-layer structure composed of hydrophobic film according to the present invention is imposed on a liquid material mixed with water and oil to selectively adsorb a small amount of oil quickly, while stably collecting a large amount of oil, while water is easily Emissions and removal make it possible to separate water and oil with high efficiency.

In addition, bulk films, which are not found in conventional technologies, make up the adsorption material, and thus have superior strength and durability than those made using fine fibers or porous materials. When applied for the purpose of oil removal, there is an effect that can solve the problem that is broken and lost.

1 and 2 are photographs showing the state of instant noodles before and after using the nonwoven oil-absorbing material in Comparative Example 1;
Figure 3 is a photograph showing the appearance of the tubular sorbent prepared in Comparative Example 2;
4 and 5 are photographs showing the state of the tubular sorbent after the process of removing the oil and instant oil removal of instant ramen broth using the tubular sorbent in Comparative Example 2;
6 and 7 are photographs showing the results of permeability test of water and canola oil by a round polyethylene tube in Comparative Example 3, respectively;
8 and 9 are photographs showing the results of permeability test of water and canola oil by the rectangular polyethylene tube in Comparative Example 4, respectively;
10 is a photograph showing the results of testing the permeability of oil in a rectangular polyethylene tube adsorbed with water in Comparative Example 5;
11 and 12 are photographs sequentially showing the results of testing the water permeability in the rectangular polyethylene tube adsorbed in oil in Comparative Example 5;
FIG. 13 is a photograph sequentially showing the test results of Example 1 in which the permeability of a mixed liquid material of water and oil between two polyethylene films at regular intervals was tested;
14 is a photograph of a spiral oil absorbent adsorbed ramen broth in Example 2;
15 is a photograph of appearance of a helical oil absorbent adsorbing a mixture of soybean oil and water in Example 3;
16 is a photograph of appearance of a plate-shaped oil absorbent prepared in Example 4;
17 is a plate-shaped adsorbent photograph of a liquid mixture of water and soybean oil in Example 4;
18 is an external photograph of a multilayer plate-shaped adsorbent prepared in Example 5;
19 is a photograph of a plate-shaped oil adsorbent adsorbed ramen broth in Example 5;
20 is a photograph of the ramen broth without removing the oil using the oil absorbent;
Figure 21 is a picture of ramen broth in the state of removing oil using the oil adsorption material.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Comparative example  1: in the form of nonwovens made of polypropylene fibers Absorbent

Cooking of A Instant Ramen

9.85 g of the powdered soup provided together was added to instant ramen having a content of 65 g, and 250 ml of water having a temperature of 90 ° C. was added thereto. After 3 minutes, the mixture was stirred 10 times using chopsticks and left for another 10 minutes to complete cooking of instant ramen (FIG. 1). As indicated on the container, the instant ramen used contained 11 g of fat.

B polypropylene Nonwovens Sorbent  Removal of used oil

Using a commercially available polypropylene fiber with a unit weight of 150 g / m 2 and a thickness of 0.72 mm, 0.4 g of a nonwoven fabric having a square shape of 26.6 cm 2 produced in a spunbond and melt-blown manner was manufactured to prepare a nonwoven oil-absorbing material. The nonwoven oil adsorbent was added to the soup of the ramen cooked in the step A, stirred 10 times to adsorb the broth, and then weighed into a chalet. The measured weight of the nonwoven oil-absorbing material was 2.28 g, and it was confirmed that 1.88 g of ramen broth was adsorbed.

On the other hand, as a result of visual observation of the state of the ramen broth after removing the nonwoven oil-absorbing material (FIG. 2), the oil removal effect was not so great that you can not feel a big difference from the state (FIG. 1) after cooking is completed.

Calculation of the weight of C adsorbed oil

The chalet containing the nonwoven type oil-absorbent adsorbed the ramen broth was put into a drier and dried at a temperature of 60 ° C. for 24 hours. The weight of the nonwoven fabric after drying was found to be 1.15 g.

Assuming that 1.13 g of all of the adsorbed ramen broth is 1.13 g removed by drying, the amount of adsorbed oil is calculated to be 0.75 g, which means that the nonwoven oil adsorbent used is about 1.5 times higher than the oil. It means that water has been absorbed.

That is, in Comparative Example 1, it was confirmed that the oil removal efficiency of the nonwoven oil-based adsorbent manufactured using the polypropylene as the hydrophobic material was not very high. These results suggest that the adsorption of oil using hydrophobic materials is dependent on the adhesion between hydrophobic materials and oil, but it is estimated that the adhesion between them is very low and thus does not exhibit high adsorption efficiency. For example, if a small amount of oil is dispersed in oil droplets, hydrophobic substances may be dispersed in the water, just as small oil droplets are dispersed in water, rather than sticking together to form a single oil droplet. When contacting the mixture, only the oil droplets in contact with the hydrophobic material are partially adsorbed, but the oil droplets in the remote area are not moved and adsorbed to the hydrophobic material.

Comparative example  2: with polyester fiber Filled  Tubular Absorbent

A tubular Sorbent  making

After filling 0.4g of polyester short fiber having 6 denier and 51mm length inside the polyethylene tube having an internal diameter of 7mm, and in order to make contact between the filled polyester fiber and oil smoothly, polyester A portion of the polyethylene tube was cut out to expose the fibers to produce a tubular sorbent of the type shown in FIG. 3.

Cooking and tube type of B instant ramen Sorbent  Removal of used oil

The instant ramen cooked in the same manner as in Comparative Example 1 was repeatedly immersed and taken out of the tubular oil absorbent prepared in step A 30 times, and the oil of the ramen broth was tried to be adsorbed and removed. As shown in Figure 4, the movement of the material into the inside of the polyester fiber filled in the tube of the tubular oil absorbent material was not made smoothly, to compensate for this, artificial suction and discharge is carried out five times from the outside of the tube It was.

C tubular Sorbent  Evaluation of the used oil removal effect

Visual observation of the tubular oil adsorbent adsorbing the oil in step B confirmed that only the penetration of water into the polyester fiber was achieved, and that the oil was adsorbed only at the exposed part of the polyester fiber to the outside of the tube. (FIG. 5). Through this, in order to increase the adsorption efficiency of the oil using the oil adsorbent, it was confirmed that sufficient pores for moving the oil should be provided between the adsorbent materials in order to maximize the oil removal efficiency.

In other words, by adhering the hydrophobic polyester short fibers, known as 76 ° contact angle with water at room temperature, into the inside of the polyethylene tube, a sorbent material having a high porosity was used to remove oil. In addition to disturbing the flow, polyester fibers are hydrophobic, but water penetrates into the pores better than oil, so water penetrates quickly into the polyester fibers, while oil droplets are partially exposed. Only limited adsorption on the surface of the polyester short fibers, it was not possible to obtain an efficient oil removal effect.

Comparative example  3: round polyethylene tube type Sorbent  Permeability test

Permeability (smooth of mass transfer) was compared for water and oil (canola oil) using hydrophobic polyethylene tubes known as 88 ° contact angle with water at room temperature. The polyethylene tube was a round one having an inner diameter of 2 mm and 7 mm, respectively.

In the test, the small inner diameter was directed downward, and then slowly added water and canola oil dissolved in an aqueous paint to the upper portion having an inner diameter of 7 mm, and stably collected without falling down by its own weight to measure the maximum volume present. Compared.

The photographs taken of the test results are shown in FIGS. 6 and 7, respectively. The cohesive force that forms water droplets due to the high surface tension of water is large, so that a large amount of water is stably collected inside the circular polyethylene tube rather than oil. You can check it.

As a result of the measurement, the maximum volume collected was 0.2 ml of water and 0.04 ml of canola oil, respectively. On the other hand, when 1 g / ml, which is the density of water, and 0.91 g / ml, which is the density of canola oil, are substituted into the measurement results, the adhesive force between water and oil inside the polyethylene tube having an inner diameter of 2 mm is calculated as follows. .

Adhesion of water = 0.2ml * 1g / ml * 0.001 * 9.8N / kg = 0.00196N

Adhesion of Canola Oil = 0.04ml * 0.91g / ml * 0.001 * 9.8N / kg = 0.000356N

As a result, hydrophobic materials such as polyethylene not only have adhesion to water, but also have 5.5 times stronger adhesion to water than oil, which is the same hydrophobic material, so that the hydrophobic sorbent trapped with water is naturally Not only could not be adsorbed through the oil, it was confirmed that the oil alone is difficult to selectively adsorb.

Using a higher hydrophobic material may reduce the adhesion to water and improve the adhesion to oil, but polyethylene is a high hydrophobic material with a contact angle of water of 88 ° at room temperature. There are not many substances with. Although some materials such as polyethersulfone, polyvinyl chloride, polydimethylsiloxane and polytetrafluoroethylene are known to be more hydrophobic than polyethylene, the surface energy of these materials and their contact angles with water also do not differ significantly from polyethylene. In addition, it is difficult to expect excellent oil removal efficiency, which is applied as a material for manufacturing oil-absorbent material, to discharge moisture with high efficiency and to effectively collect only oil.

Comparative example  4: rectangular polyethylene tubing Sorbent  Permeability test

One end of a round polyethylene tube having an inner diameter of 7 mm was heat-processed to produce a rectangular polyethylene tube having rectangular pores having a length of 12 mm and a width of 0.5 mm. The water and oil (canola oil) were respectively similar to those of Example 3. Permeability (smooth of mass transfer) was compared.

Similarly, blue water was dissolved in water to make the adsorbed water visible, and experiments were conducted on water and oil, and photographs of the results are shown in FIGS. 8 and 9, respectively. As shown in Figures 8 and 9, in the form of non-circular pores, the collection amount of water, which tends to form water droplets in a spherical form, is significantly reduced, and in the case of oil, a larger adhesion area is provided so that a larger amount of oil is provided. It was confirmed that it was collected.

In addition, as a result of measuring the maximum volume of stably collected water and canola oil, 0.0804 ml of water and 0.0984 ml of canola oil, respectively, appeared in the inside of the tube made of the same material when the non-round rectangular pores were formed. The adhesion of water can be reduced to about 60% or less, and on the contrary, the adhesion of oil can be increased by about 2.46 times.

In summary, the results of Comparative Example 3 and Comparative Example 4, in order to improve the efficiency of the absorbent material, even if a hydrophobic material is applied to provide voids, the circular voids can not reduce the adhesive strength of water, it is to increase the adhesive strength of the oil It was also confirmed that it was limited. Furthermore, it was confirmed that it is effective to form pores of flat and wide rectangular shape that can maximize surface area, not circular, in order to improve adhesion with oil and decrease adhesion with water.

Comparative example  5: Permeability of mixed liquid material of water and oil adsorbed on rectangular polyethylene tube

A. Oil Permeation Characteristics of Rectangular Polyethylene Tubes Adsorbed by Water

Canola oil was slowly added to the rectangular polyethylene tube to which the water of the comparative example 4 was adsorbed, and the moving characteristic in the tube in the state which mixed water and oil was tested.

As a result of the addition of canola oil, the load of canola oil was added to the water present in the lower portion and water began to escape from the tube.

In FIG. 10, the state before the water was completely removed was photographed, and about 0.003 ml of the water existing in the lower portion of the tube did not escape, and the amount of instantaneous oil reached 0.105 ml.

This is more than the stable adsorption amount of canola oil in the presence of only canola oil confirmed in Comparative Example 4, through which the presence of a small amount of water it can be confirmed that the permeability of the oil in the hydrophobic tube is significantly reduced.

Water Permeation Characteristics in Rectangular Polyethylene Tubes Adsorbed by B Oil

Slowly adding water dissolved in an aqueous paint on the rectangular polyethylene tube adsorbed in the canola oil of Comparative Example 4 was tested for the movement characteristics inside the tube in a state where water and oil were mixed, and the results are sequentially shown in FIGS. 11 and 12. As shown.

Even if water was added, removal of oil existing in the lower part was limited, and as shown in FIGS. 11 and 12, it was confirmed that the water moved between the adsorbed canola oil and released.

Comparative Example 4 shows that the polyethylene tube having a rectangular pore structure possesses a structural feature capable of selectively collecting oil due to a higher adhesion to oil and a lower adhesion to water than a round tube. Although it could be confirmed, in Comparative Example 5, when water is introduced, it hinders the movement of oil. On the contrary, when oil is introduced, it hinders the flow of water. It was confirmed that it was difficult to achieve smoothly, and eventually found that wider pores were needed to smoothly move the liquid in the form of a mixture of water and oil.

Example  1: with a certain interval Two pieces  Transport Characteristics of Water-Oil Mixed Liquid Material Between Polyethylene Films

Both ends of the end portions of the polyethylene tube having rectangular pores having a length of 12 mm and a width of 0.5 mm, which are the same as those used in Comparative Example 4, were cut out by 1 mm, so that two polyethylene films having a width of 10 mm and a thickness of 0.4 mm were spaced at 0.5 mm intervals. Modified polyethylene tubes with distal ends in the form of batches were made.

Using the modified polyethylene tube thus prepared, the distal end portion was fixed downward, and then water was slowly adsorbed onto the polyethylene film by slowly adding water dissolved in blue aqueous paint through the upper portion of the tube. Canola oil was slowly added through the top of the water-adsorbed tube again. As canola oil is added, water is released from the distal end of the tube with the load of canola oil applied to the water present in the lower portion, and when 0.048 ml of canola oil is added, the water collected inside the tube is completely removed from the tube distal end. Removed.

13 shows photographs taken sequentially, and compared with the results of Comparative Example 5, the water collected inside the tube prevents the adhesion of oil to the mass transfer of the tube. It can be confirmed that it can be weakened by about 54% by deformation to the form of the film spaced apart.

In other words, arranging open parallel films at regular intervals, rather than rectangular closed pore structures, makes the movement of materials smooth and selective adsorption to oil, in the same effect as making the pores infinitely large. It can be seen that a form of oil-adsorbent having excellent ability can be obtained.

Example  2: spiral with polyethylene film Sorbent  Used oil removal

Spiral with polyethylene film Sorbent  making

A polyethylene film having a width of 10 mm and a thickness of 500 μm was inserted in the center of a polyethylene film having a width of 35 mm, a length of 220 mm, and a thickness of 50 μm, and wound in a cylindrical shape so that the space between the polyethylene films was 500 μm. Bonding completed the spiral absorbent. The spiral sorbent prepared was 3 g in weight.

Cooking of B instant ramen

9.85 g of the powdered soup provided together was added to commercially-available instant ramen with a weight of 65 g, and 250 ml of water having a temperature of 90 ° C. was added thereto. After 3 minutes, the mixture was stirred 10 times using chopsticks and left for 1 minute to complete cooking of instant ramen. The fat content in the ramen labeled on the container was 11 g.

C spiral Sorbent  Adsorption of used oil

The spiral oil-adsorbent prepared in A was put in a ramen broth cooked in B, and the broth was adsorbed while repeating stirring and dipping ten times. The appearance of the spiral oil adsorbent adsorbed the broth was photographed and shown in FIG. 14. As shown in Figure 14, the soup was not leaked from the helical oil absorbent, but the formability of the polyethylene film having a thickness of 50㎛ was weak so that the gap between the films provided in the manufacturing process was not maintained.

On the other hand, when the weight of the helical oil adsorbent adsorbed broth was measured in a chalet, the weight was 5.35 g, indicating that 2.35 g of broth was adsorbed.

D Volume output of adsorbed oil

The weighted spiral sorbent was placed in a dryer with a chalet and dried at a temperature of 60 ° C. for 48 hours, and the weight was measured to be 3.85 g. The amount of water removed through drying is calculated to be 1.5 g, which is about 1.76 times the adsorption amount of 0.85 g of oil.

Example  3: spiral with polyester film Sorbent  Used oil removal

Spiral with A polyester film Sorbent  Produce

In accordance with the end of the polyester film having a width of 35 mm, a length of 220 mm and a thickness of 50 μm, a polyester film having a width of 10 mm and a thickness of 50 μm is superimposed and wound in a cylindrical shape so that the space between the polyester films is 50 μm. To this end, a polyethylene tube was attached, and the sorbent and the connecting portion were bent at 90 ° to complete the spiral sorbent. The weight of the prepared sorbent was 3.2 g.

B Preparation of a Liquid Mixture of Water and Oil

In a 500 mL beaker, 20 g of commercially available soybean oil and 100 g of water were added to prepare a liquid mixture in which oil and water were mixed.

C spiral Sorbent  Adsorption of used oil

Using the polyester spiral oil adsorbent prepared in step A, it was immersed up to the bottom of the liquid mixture of oil and water prepared in step B and taken out 10 times to adsorb the liquid material, and then placed in a chalet and weighed. And the external photograph of the spiral oil adsorption material which adsorb | sucked the mixture of soybean oil and water is shown in FIG. The measured weight was 3.75 g and it was calculated that 0.55 g of liquid material was adsorbed.

D Volume output of adsorbed oil

The weighted spiral sorbent was placed in a dryer with a chalet and dried at a temperature of 60 ° C. for 48 hours, and the weight was found to be 3.51 g. The amount of water removed through drying is calculated to be 0.24 g, which means that 0.31 g of soybean oil is adsorbed.

Example  4 with polyester film Plate type Sorbent  Used oil removal

A polyester film Plate type Sorbent  Produce

15 polyester films each having a length of 50 mm and a thickness of 100 μm and 100 μm in thickness were prepared, and the center of each film was punched, and then laminated while inserting a spacer having a thickness of 500 μm between the films. Films were laminated in the form of a plate-shaped adsorbent having a shape of 500 μm in intervals (FIG. 16). The weight of the prepared plate-shaped adsorbent was 6.9g.

B Preparation of a Liquid Mixture of Water and Oil

In a 500 mL beaker, 20 g of commercially available soybean oil and 100 g of water were added to prepare a liquid mixture in which oil and water were mixed.

C Plate type Sorbent  Adsorption of used oil

Using the plate-shaped oil adsorbent prepared in step A, it was immersed up to the bottom of the liquid mixture of oil and water prepared in step B and taken out 10 times to adsorb the liquid material (Fig. 17), and then put in a chalet Was measured. The measured weight was 14.9 g and the 8 g liquid substance was calculated to be adsorbed.

D Volume output of adsorbed oil

The multi-layered plate-shaped adsorbent having the above-described weight was put in a drier and dried at a temperature of 60 ° C. for 48 hours, and the weight thereof was measured. The measurement result was 14.5g and the amount of water removed by drying was calculated to be 0.4g, which means that 7.6g soybean oil was adsorbed. This is more than the weight of the multilayer plate-shaped adsorbent, it was confirmed that the oil adsorption amount of the plate-shaped adsorbent significantly higher than the oil adsorption amount of the other type of oil adsorbent.

Example  Multilayer consisting of 5 polyester films Plate type Sorbent  Used oil removal

Fabrication of multilayer plate-shaped adsorbent using A polyester film

10 polyester films each having a length of 50 mm and a thickness of 100 μm were prepared, and the center of each film was punched, and then laminated while inserting a spacer having a thickness of 500 μm between the films. Films were laminated in the shape of a multilayer plate-shaped adsorbent in the form of 500 μm intervals (FIG. 18). The total weight of the prepared multilayer plate-shaped adsorbent was 5.7 g.

Cooking of B instant ramen

9.85 g of the powdered soup provided with each was added to two instant noodles with a weight of 65 g of commercially available weight, followed by 250 ml of water having a temperature of 90 ° C. After 3 minutes, the mixture was stirred 10 times using chopsticks and left for 1 minute to complete the cooking of two instant noodles. The fat content in each ramen labeled on the container was 11 g.

C Removal of oil using multilayer plate-shaped adsorbent

The multi-layered plate-shaped adsorbent prepared in step A was immersed in one ramen broth cooked in step B and then tilted to remove excess broth 10 times to adsorb oil in the ramen broth. After that, the weight of the adsorbent was placed in a chalet, the weight was found to be 8.35g (Fig. 19).

D Visual comparison of oil removal effect by sorbents

Of the two ramen cooked in the above step B, the oil removed and removed by the oil adsorbent, respectively, was transferred to a transparent glass bottle, and the degree of oil floating in each ramen broth was visually observed.

As a result, it was confirmed that a large amount of red oil droplets existed on the surface of the cooked ramen broth (FIG. 20) without removing the oil by using an oil absorbent. In Figure 21 it was confirmed that the oil droplets are significantly reduced.

Through this, even in the presence of a relatively small amount of oil compared to the water, it was confirmed that the multilayer plate-shaped adsorbent prepared by laminating the polyester film can remove the oil very efficiently.

Claims (7)

A hydrophobic film having a contact angle with water of 45 ° or more at room temperature, wherein the hydrophobic film comprises a multi-layered structure spaced apart at intervals of 10 μm to 20,000 μm. The oil-adsorbing material according to claim 1, wherein the hydrophobic film has a thickness of between 5 µm and 3,000 µm. The oil-adsorbing material according to claim 1, wherein at least two hydrophobic films are arranged in a stack so as to have a multilayer plate-like structure. The oil adsorbent according to claim 1, wherein the hydrophobic film has a spiral multilayer structure spirally wound. The oil absorbent material according to claim 1, wherein two or more hollow cylinders or polygonal cylinders of the hydrophobic film are arranged in a multi-layered structure. The oil-adsorbing material of claim 1, wherein a space is formed between the hydrophobic films to form a space between the hydrophobic films. The oil adsorbent according to claim 1, wherein a gap is formed between the hydrophobic films by using a hydrophobic film having irregularities on the surface thereof.

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