KR102013196B1 - Method for Preparing Film with Slippery Surfaces - Google Patents

Abstract

The present invention relates to a method for producing a film having a slippery surface with low ice adhesion in a simple and low cost process and to a film having a slippery surface prepared therefrom. The method for producing a film having a slippery surface according to the present invention can provide a film having a slippery surface having various shapes and a large area using only a simple and low cost process such as acid treatment. Film having a slippery surface of the present invention can be used in all industries that require voluntary defrosting due to the performance degradation and accidents caused by the surface ice, such as aircraft, automobiles, ships, buildings, LNG pneumatic carburetor.

Description

Method for preparing film with slippery surface {Method for Preparing Film with Slippery Surfaces}

The present invention relates to a method for producing a film having a slippery surface, and more particularly, to a method for manufacturing a film having a slippery surface having low ice adhesion in a simple and low-cost process, and to a film having a slippery surface prepared therefrom. It is about.

Ice generated on the surface of a machine such as an aircraft, a car, a ship, etc. has problems that cause the machine to malfunction and cause serious accidents. In general, as a method of removing the ice on the surface, a method of directly heating and melting the surface is widely used, but it uses a lot of energy, and even after removing the ice, it is frozen again due to the surface residue, and thus effective defrosting is impossible.

Recently, attention has been paid to the development of liquid-repellent surfaces that refer to the ability of self-cleaning of surfaces of animals, insects and plants as a solution to this problem. The repellent surface first has a water repellent surface inspired by the lotus effect. The water repellent surface is a structure in which water droplets can easily roll down due to the surface microstructure and low surface energy. Water-repellent surfaces have been studied for continuous performance improvement in various fields that require self-cleaning, but there are problems such as durability in super water-repellent implementation and human hazards of fluorine-based compounds.

After introducing the concept of SLIPS at Havard University in 2011, research on slippery surfaces has been actively conducted. This is a natural simulation of the surface of the insect trap, and there is a lubrication layer on the surface, thereby demonstrating the self-cleaning ability that the droplets easily roll down even at a small sliding angle.

However, the water-repellent surface using nano / micro structure has the advantage of delaying the action of ice formation by effective water removal, but after the freezing of water droplets, it is difficult to remove after ice formation due to sharp microstructure and high adhesion between ice. I have a problem. In addition, in the case of a technique in which a lubricating layer is coated on a certain microstructure or a polymer polymer to realize a surface on which ice slides easily due to lubrication of the lubricating oil, a unit cost such as plasma, ultraviolet rays, and lithography is very high when forming a structure under the lubricating oil layer. It required a high process and the lubrication layer formed a two-dimensional planar structure, which had a limit of having a large contact area with ice.

For example, Korean Patent No. 10-1410826 describes a super water-repellent surface in which nanostructures and microstructures are mixed, while forming a nanostructure on an aluminum metal surface by anodizing and then forming a microstructure by etching, and water repellency. A technique for forming a super water-repellent surface in which nanostructures and microstructures formed by coating a material on a surface thereof is mixed. However, this method is complicated and expensive because the nanostructure and the microstructure must be formed separately, and the lubrication layer forms a two-dimensional plane, thereby causing a problem of wide contact area with the ice.

In addition, there is a case of producing a pleated shape by irradiating ultraviolet (UVO) in the ozone region after pulling the polymer material and applying a tensile force, but the external tensile force is required, and special equipment is required for the ultraviolet irradiation, which leads to high process cost. There is a problem that occurs, there is a limitation that the process is not applicable to curved surfaces other than flat plate.

Therefore, in various industries requiring defrosting such as aircraft, automobiles, ships, buildings, etc., it is urgent to develop a technology capable of manufacturing a slippery surface that can prevent ice from freezing by attaching to ice freezing parts in a simple process and at low cost. Situation.

An object of the present invention for solving such a problem is to provide a method for producing a film having a slippery surface of various shapes and a large area easily by a simple process such as acid treatment.

Another object of the present invention is to provide a film having a slippery surface produced by the above method.

In order to achieve the above object, the present invention provides a method for producing a film having a slippery surface, comprising the following steps:

(a) immersing the polymer film in an acid solution;

(b) washing the immersed film with water; And

(c) immersing the washed film in lubricant to absorb the lubricant into the polymer.

The present invention also provides a method for producing a film having a slippery surface, further comprising the step of attaching the polymer film onto the release film before step (a).

In the present invention, the polymer may be poly (dimethylsiloxane) (PDMS).

In the present invention, the polymer may be an elastomer in which poly (dimethylsiloxane) (PDMS) and silicone rubber are mixed in a weight ratio of 6: 4 to 8: 2.

In the present invention, the thickness of the polymer film may be 50 to 600㎛.

In the present invention, the acid solution may include sulfuric acid, nitric acid and water, wherein the sulfuric acid: nitric acid has a volume ratio of 2: 1 to 4: 1, (sulfuric acid + nitric acid): water is 5: 1 to 10 It may have a volume ratio of 1: 1.

In the present invention, step (a) may be carried out at 80 to 100 ℃.

In the present invention, step (a) may be performed for 30 to 120 seconds.

In the present invention, step (b) may be performed before 5 minutes after step (a).

In the present invention, the lubricating oil is silicone oil, n-octane, n-decane, n-decane, n-dodecane, n-hexadecane ), Diesel, gasoline, crude oil and mixtures thereof.

In the present invention, step (c) may be performed until the lubricant is saturated in the polymer.

The method of the present invention may further comprise immersing the film in an octadecyltrichlorosilane (OTS) solution between steps (b) and (c).

The present invention also provides a film having a slippery surface on which a fine wrinkle having a width of 10 to 200 μm and a depth of 10 to 60 μm is formed on the surface of the polymer film, and the lubricant is absorbed.

In the present invention, the polymer may be poly (dimethylsiloxane) (PDMS).

In the present invention, the lubricating oil is silicone oil, n-octane, n-decane, n-decane, n-dodecane, n-hexadecane ), Diesel, gasoline, crude oil and mixtures thereof.

In the present invention, the polymer may be a transparent material, it may have a flexible (flexible) material.

In the present invention, the polymer may be an elastomer in which poly (dimethylsiloxane) (PDMS) and silicone rubber are mixed in a weight ratio of 6: 4 to 8: 2, and the film may have ice of 5 kPa or less. It may have an adhesion, and may have an ice adhesion of 15 kPa or less in a 50 to 150% tension state.

The method for producing a film having a slippery surface according to the present invention can provide a film having a slippery surface having various shapes and a large area using only a simple and low cost process such as acid treatment. Film having a slippery surface of the present invention can be used in all industries that require voluntary defrosting due to the performance degradation and accidents caused by the surface ice, such as aircraft, automobiles, ships, buildings, LNG pneumatic carburetor.

Figure 1 shows an image of the case having a slippery surface of the present invention when manufactured in a transparent form (a) and when implemented in a form that can be attached to the curved surface (b).
FIG. 2 shows a confocal laser scanning microscopy (CLSM) image after immersing a PDMS film in an acid solution for 30 seconds, 90 seconds, 120 seconds and 150 seconds.
3 shows CLSM images of PDMS films washed with water immediately after acid treatment (a) and 10 minutes after acid treatment (b).
4 shows a CLSM image of the PDMS film surface after 24 hours immersion in silicone oil.
5 shows the results of measuring ice adhesion of various kinds of films.
Figure 6 shows the sliding of ice on the PDMS film (a) having a slippery surface and the PDMS film (b) having a flat surface of the present invention.
7 shows the appearance of a PDMS composite film with a slippery surface before and after tension.
Figure 8 shows the results of measuring the ice adhesion of the PDMS composite film having a slippery surface according to the degree of tension.

Hereinafter, the specific aspect of this invention is demonstrated in detail. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In general, the nomenclature used herein is well known and commonly used in the art.

The present invention relates to a method for producing a film having a slippery surface in a simple process and at low cost.

The method for producing a film having a slippery surface of the present invention comprises the following steps:

(a) immersing the polymer film in an acid solution;

(b) washing the immersed film with water; And

(c) immersing the washed film in lubricant to absorb the lubricant into the polymer.

The process of the present invention can form fine wrinkles to minimize the ice adhesion to the surface of the polymer film through a simple acid treatment and washing as described above.

The manufacturing method according to the present invention may further include the step of attaching the polymer film on the release film before step (a).

The preparation method according to the present invention may further include immersing the film in an octadecyltrichlorosilane (OTS) solution between steps (b) and (c).

1. Polymer film forming and release film attaching step

The release film may serve to fix the polymer film in the process of forming the fine wrinkles on the polymer film, and can be used in the form of a sticker by removing the release film after the final product is manufactured.

The release film attaching step may be performed by a dip coating method by dipping the release film in the liquid polymer solution, but is not limited thereto, and other known methods may be used.

The polymer solution can adjust the viscosity according to the desired coating thickness, it can be lowered by using an organic solvent such as acetone. In order that the polymer film is not damaged and wrinkles are easily formed, it is preferable to coat the polymer film with a thickness of 50 to 600 µm, and for this purpose, it is preferable to add 20 to 50% by weight of acetone to the polymer solution.

The polymer is not particularly limited as long as it is a polymer having a material capable of absorbing lubricating oil such as oil, but poly (dimethylsiloxane) (PDMS) is most preferred.

It is also possible to add additional performance by adding urea, graphene, silicone, rubber, and the like to the polymer. For example, when urea is added to PDMS, self-healing properties that heal itself can be imparted even if the material is wound, and when graphene is added to PDMS, conductivity can be imparted to the film, and silicone based PDMS When the high elastic polymer material is added, it is possible to form a film having excellent elasticity.

In one embodiment of the present invention, the polymer may be an elastomer mixed with PDMS and silicone rubber in a weight ratio of 6: 4 to 8: 2. If the weight ratio of the silicone rubber is less than 20% by weight, it is difficult to obtain the desired elasticity, and when the weight ratio is more than 40% by weight, there is a problem in that an uneven wrinkle is formed or the film itself melts. Silicone rubber can be used Eco-flex, a polyester-based silicone rubber.

Film having a slippery surface of the present invention can be produced in a flexible form or a transparent form by varying the type and physical properties of the polymer (Fig. 1), it is possible to be utilized in a variety of industries.

2. Acid solution immersion step

The polymer film formed on the release film (or alone without the release film) by the release film attaching step may be immersed in an acid solution to form wrinkles on the surface.

The acid solution preferably contains an acid component capable of forming wrinkles by oxidizing the surface of the polymer film. As an acid which can be used preferably in this invention, the aqueous solution which mixed sulfuric acid and nitric acid can be used.

The sulfuric acid serves to dominantly oxidize the surface of the polymer, and nitric acid can act as a reaction initiation and promoter.

In one embodiment of the present invention, the acid solution is preferably a mixture of sulfuric acid, nitric acid and water, wherein sulfuric acid: nitric acid is preferably used in a volume ratio of 2: 1 to 4: 1. In addition, sulfuric acid and nitric acid are preferably used in a volume ratio of 5: 1 to 10: 1 with water. When the ratio of sulfuric acid in the acid solution is less than 40% by volume, it is difficult to form wrinkles on the surface of the polymer, and when the ratio of sulfuric acid is more than 80% by volume, wrinkles may be cracked and crater-shaped depressions may be formed due to excessive oxidation. have.

In a preferred embodiment of the invention, sulfuric acid: nitric acid: water is most preferably used in a volume ratio of about 6: 2: 1. The mixture is preferably stirred for about 1 hour after mixing to lower the reactivity to prevent excessive oxidation.

The acid solution is preferably immersed in the polymer film after being heated to a temperature of 80 to 100 ° C. to facilitate wrinkle formation.

The polymer film may be wrinkled on the surface by being immersed in the acid solution for 10 to 150 seconds, preferably 30 to 120 seconds. In the present invention, it has been found that the shape of the wrinkles on the surface can be controlled according to the time to immerse the polymer film in the acid solution. If the immersion time is shorter than the above range, the bone depth of the wrinkle is so thin that the ice removal efficiency is insufficient, and if it is immersed longer than the above range, the wrinkle is so large that it is rather difficult to obtain a defrosting effect.

3. washing steps

The polymer film immersed in an acid solution is washed with water or a solvent having a very low absorption rate of the polymer film material such as ethylene glycol, glycerol, and the like.

When the acid treated polymer film is washed with water in an acid solution, three-dimensional fine wrinkles may be formed due to the difference in residual stress between the oxidized surface and the elastomer layer, and wrinkles having an effective depth for removing ice may be formed. .

The washing is preferably performed without delay within less than 10 minutes after acid treatment. When 10 minutes have passed after the acid treatment, there is a problem that wrinkles are not formed for each region or wrinkles that are not clear are formed. Performing the washing, preferably within 5 minutes, most preferably immediately after the acid treatment, may produce clear wrinkles.

4. Alkylation Reforming Step

An alkylation modification step of the surface may be further performed after the washing step to improve the stability of the washed polymer film surface.

Alkylation modification can use an octadecyltrichlorosilane (OTS) solution based on self-assembled monolayer formation.

The OTS solution is preferably diluted with an organic solvent such as toluene or hexane, and at this time, it is preferable to dilute solvent: OTS in a volume ratio of 200: 1 to 1000: 1. .

The washed polymer film is preferably immersed in the OTS dilution solution for at least 60 minutes. If the immersion time is shorter than the above range, the polymer film surface is hardly sufficiently alkylated.

5. Lubricant absorption stage

The cooled polymer film may be immersed in the lubricating oil so that the lubricating oil may be absorbed into the fine wrinkle shape.

The lubricant may be silicone oil; paraffinic oils such as n-octane, n-decane, n-dodecane, n-hexadecane and the like; Petroleum oils such as diesel, gasoline, crude oil and the like can be used.

The immersion is preferably carried out until the lubricating oil is completely absorbed by the polymer and no further mass increase is seen. For example, if PDMS is added to 100 cs of silicone oil, the oil will saturate after 24 hours and no mass increase will occur.

When the lubricating oil is absorbed by the polymer, swelling occurs and the roughness and aspect ratio of the surface is reduced to change into a smooth wrinkle. The larger the wrinkle, the more the swelling width is due to the amount of lubricant remaining in the wrinkle.

In consideration of the swelling phenomenon, it is preferable to set the width and depth of the wrinkles formed in the acid treatment and washing step in consideration of the width and depth of the lubricating oil is absorbed and changed.

In one embodiment of the present invention it was confirmed that the final formed fine wrinkles have the lowest ice adhesion when having a width of 10 to 200㎛ and a depth of 10 to 60㎛.

The invention also relates to a film having a slippery surface produced by the method as described above.

The film can be attached to a release film and conveniently used in the same manner as a sticker.

The surface of the film is preferably formed with fine wrinkles having a width of 10 to 200㎛ and a depth of 10 to 60㎛, lubricating oil is absorbed so that the ice is not easily attached. When the thickness of the film is thin, the depth may be adjusted in consideration of the thickness of the film.

The film according to the present invention can be attached to the surface of the article that needs to be prevented from adhering to ice and have an ice adhesion of 5 kPa or less. Adhesion below 5 kPa is significantly lower than conventionally known slippery films.

In addition, the film of the present invention can be made of an elastic material according to the additive material is easy to deform, such as tension, compression, torsion, and can maintain a low ice adhesion because the wrinkle structure is maintained even if the deformation occurs attached to the product surface have. In one embodiment of the present invention it was confirmed that exhibits a low ice adhesion of less than 15kPa even in a 100% stretched high elastic film to which high elastic silicone rubber is added to PDMS.

In the film having a slippery surface according to the present invention, the ice on the surface of the object can be removed by its own weight without additional energy consumption such as vibration and heating, and in the future, such as aircraft, automobiles, ships, buildings, LNG pneumatic vaporizers, etc. In all industries where spontaneous defrosting is required due to deterioration of performance and accidents, it is possible to prevent the formation of ice by simply attaching it to the freezing part of the ice.

Example

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, these examples show some experimental methods and compositions in order to illustrate the present invention by way of example, the scope of the present invention is not limited to these examples.

Preparation Example 1 PDMS Film Preparation

The viscosity was adjusted by adding 5 g of acetone to 10 g of polydimethylsilonic acid (PDMS) precursor solution.

5 x 5 cm ² PET sticker film (UBIGEO) was immersed in the PDMS precursor solution and removed to form a PDMS liquid film on the sticker film by a dip coating method. The sticker film on which the PDMS film was formed was kept at room temperature for 30 minutes, and then heated in an oven at 100 ° C. for 1 hour to prepare a PDMS film having a thickness of 500 μm.

Preparation Example 2 Acid Solution Treatment

Sulfuric acid (> 95%), nitric acid and demineralized water were mixed at a volume ratio of 6: 2: 1 to prepare an acid mixed solution. The mixed solution was stirred at 90 ° C. for 50 minutes to dilute the excess reactivity.

The PDMS film prepared in Preparation Example 1 was immersed in the acid mixture solution, and the film surface morphology after 30 seconds, 90 seconds, 120 seconds, and 150 seconds was observed.

The image of the shape of the surface over time using a confocal laser scanning microscopy (CLSM) is shown in FIG. 2.

In Fig. 2, it can be seen that when the acid treatment is shortened, small and fine wrinkles are formed on the surface, and as the acid treatment is increased, large and deep wrinkles are formed on the surface.

Table 1 shows the results of measuring the width, depth, arithmetic average roughness (R _a ) and root mean square roughness (R _rms ) of wrinkles using a laser.

Reaction time Width (㎛) Depth (μm) R _a (μm) R _rms (μm) 30 s 38.57 ± 4.76 16.18 ± 1.04 3.53 ± 0.41 4.14 ± 0.43 90 s 96.36 ± 12.02 42.03 ± 1.30 10.72 ± 0.71 12.04 ± 0.58 120 s 129.87 ± 6.95 58.54 ± 1.68 16.01 ± 1.32 18.08 ± 0.98 150 s 211.11 ± 27.50 74.38 ± 2.76 18.71 ± 2.15 21.34 ± 1.80

As shown in Figure 2 and Table 1, the longer the time to be immersed in the acid solution, the longer the width and depth of the fine wrinkles, R _a And R _rms was also confirmed to be large.

Preparation Example 3 Acid Washing

In the preparation example 2, the PDMS film acid-treated for 90 seconds with an acid solution was washed for 1 minute immediately after the acid treatment with 25 ° C. water or 10 minutes after the acid treatment, and the image of each PDMS film was observed with CLSM in FIG. 3. Indicated.

In Fig. 3, when washing with water immediately after the acid treatment, clear wrinkles were formed on the surface of the PDMS film (Fig. 3 (a)), but when washing with water after 10 minutes of acid treatment, wrinkles were not formed or cleared for each area. It can be seen that the fine wrinkles are not formed (Fig. 3 (b)).

Preparation Example 4 Lubricant Absorption

In Preparation Example 1, the acid-treated PDMS film was washed with water at 25 ° C. immediately after washing, and then immersed in a reactor containing 100 cs of silicone oil, thereby treating the oil to be absorbed into the PDMS film.

The CLSM image of the PDMS film surface after immersion for 24 hours is shown in FIG. 4.

In FIG. 4, it can be seen that the fine wrinkles in which the oil is absorbed exhibits a softer shape with reduced roughness and aspect ratio.

Changes in the width, depth, and the like of specific wrinkles before and after immersion in oil for 24 hours are shown in Table 2 below.

Oxidation time Lubricant Soak Time Width (㎛) Depth (μm) R _a (μm) R _rms (μm) 30 seconds Before immersion 38.57 ± 4.76 16.18 ± 1.04 3.53 ± 0.41 4.14 ± 0.43 After 24 hours soaking 38.51 ± 3.50 11.46 ± 1.98 2.34 ± 0.14 2.80 ± 0.18 90 sec Before immersion 96.36 ± 12.02 42.03 ± 1.30 10.72 ± 0.71 12.04 ± 0.58 After 24 hours soaking 105.55 ± 4.31 30.45 ± 2.62 8.16 ± 0.58 9.52 ± 0.67 120 seconds Before immersion 129.87 ± 6.95 58.54 ± 1.68 16.01 ± 1.32 18.08 ± 0.98 After 24 hours soaking 181.97 ± 10.71 49.10 ± 4.62 14.09 ± 1.39 16.09 ± 1.51 150 sec Before immersion 211.11 ± 27.50 74.38 ± 2.76 18.71 ± 2.15 21.34 ± 1.80 After 24 hours soaking 240.63 ± 16.98 56.15 ± 5.84 14.85 ± 1.60 16.70 ± 1.36

In Table 2, when the lubricating oil is absorbed by the polymer by 24 hours immersion, it can be seen that the width of the wrinkles is increased by 10 to 40%, the depth is reduced by 15 to 30%. The larger the wrinkle, the more the swelling width is due to the amount of lubricant remaining in the wrinkle.

Example 1 Measurement of Ice Adhesion

In order to investigate the ice adhesion of the PDMS film having a slippery surface, the aluminum plate, the PDMS film without the fine wrinkles, the PDMS film without the fine wrinkles absorbed with silicone oil, acid for 90 seconds according to Preparation Example 1 Immediately after treatment, PDMS films were washed with water to form wrinkles, and acid treatment and oil absorbed PDMS films were prepared for 90 seconds in Preparation Example 3, respectively, and ice adhesion was measured.

The ice adhesion force was placed in the thermo-hygrostat inside a plastic tube with a diameter of 7.6 mm and a thickness of 0.5 mm on the surface to be measured, and 200 μL of water was injected into the tube to completely freeze at minus 15 ° C. for 30 minutes. Then, the force generated when the probe measuring ice adhesion force was pushed out of the plastic tube while moving from 0.05 mm / s in shear direction with respect to the measurement surface at a height of 1 mm from the measurement surface. The measurement results are shown in FIG. 5.

In FIG. 5, the oil-absorbed PDMS film showed lower ice adhesion than the wrinkled PDMS film, and the wrinkled and oil-absorbed PDMS film showed the lowest ice adhesion.

The PDMS film having a slippery surface according to the present invention exhibited an ice adhesion of 5 kPa or less, which is about 200 times lower than that of the most widely used aluminum sheet in the industry.

Example 2: Ice Slip Check

For the PDMS film having the slippery surface and the PDMS film having the flat surface of the present invention, the degree of ice slip was actually confirmed. The PDMS film having the slippery surface of the present invention used an acid treated and oil absorbed PDMS film for 90 seconds in Preparation Example 3.

Both films were fixed at a 5 ° tilt angle and the same size of ice was raised to measure the degree of sliding down over time.

In Figure 6 (a), in the case of the PDMS film having a slippery surface it can be seen that the ice gradually flows down over time.

On the other hand, in Figure 6 (b), the flat surface of the PDMS film can be seen that the ice is fixed in place over time.

Example 3: Analysis of ice adhesion according to the size of the wrinkles

In order to confirm the ice adhesion force according to the width and depth of the wrinkles, by measuring the acid treatment time and measuring the ice adhesion force in the same manner as in Example 1 for each of the specimens wrinkled at different widths and depths, It is shown in Table 3 below.

Reaction time Width (㎛) Depth (μm) Ice adhesion (kPa) 0 s (reputation) - - 35.24 ± 8.09 30 s 38.57 ± 4.76 16.18 ± 1.04 7.92 ± 0.84 90 s 96.36 ± 12.02 42.03 ± 1.30 5.14 ± 2.25 120 s 129.87 ± 6.95 58.54 ± 1.68 8.21 ± 4.28 150 s 211.11 ± 27.50 74.38 ± 2.76 22.52 ± 4.41

As a result, it can be seen that the PDMS film having a fine wrinkle having a width of 10 to 200 μm and a depth of 10 to 60 μm exhibits lower ice adhesion than the PDMS film having a fine wrinkle having a width of more than 200 μm and a depth of more than 60 μm. there was.

Example 4 Analysis of Ice Adhesion After Tensile Film

In order to confirm that ice adhesion is maintained even after the deformation of the film, a stretchable PDMS film was prepared.

7 g of PDMS precursor solution, 5 g of acetone, and 3 g of high elastic silicone rubber (Eco-flex, Smooth-On) were mixed to prepare a composite film having the same specification as in Preparation Example 1.

Thereafter, an acid treated and oil absorbed composite film was prepared for 90 seconds in the same manner as in Preparation Example 3. In order to measure the ice adhesion force according to the modified situation, the film was stretched and the ends were fixed with a clamp, and then the ice adhesion force was measured in the same manner as in Example 1. The measurement results are shown in FIG. 8.

As can be seen in FIG. 8, the film with the slippery surface of the present invention still exhibited low ice adhesion of 15 kPa or less (about 10 kPa) even at 50% and 100% tensile. It is judged that the wrinkles formed on the surface of the film maintain a certain shape even when being tensioned and thus exhibit low adhesion to ice.

As described above in detail a specific part of the content of the present invention, for those of ordinary skill in the art, such a specific description is only a preferred embodiment, which is not limited by the scope of the present invention Will be obvious. Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

Claims (20)

A method for producing a film having a slippery surface, comprising the following steps:
(a) immersing the polymer film in an acid solution at 80 to 100 ° C. for 30 to 120 seconds;
(b) washing the immersed film with water; And
(c) immersing the washed film in lubricating oil to absorb lubricating oil in the polymer to form fine wrinkles having a width of 10 to 200 μm and a depth of 10 to 60 μm on the surface of the film.
The method of claim 1,
A method of making a film having a slippery surface, further comprising the step of attaching a polymer film on a release film prior to step (a).
The method of claim 1,
Between (b) and (c), further comprising the step of immersing the film in octadecyltrichlorosilane (OTS) solution, the method of producing a film having a slippery surface.
The method of claim 1,
A method for producing a film having a slippery surface, characterized in that the polymer is poly (dimethylsiloxane) (PDMS).
The method of claim 1,
The polymer is an elastic polymer obtained by mixing poly (dimethylsiloxane) (polyMS) and silicone rubber in a weight ratio of 6: 4 to 8: 2.
The method of claim 1,
The thickness of the polymer film is 50 to 600 ㎛, characterized in that the slippery surface of the film production method.
The method of claim 1,
The acid solution comprises sulfuric acid, nitric acid and water, the method of producing a film having a slippery surface.
The method of claim 7, wherein
The sulfuric acid: nitric acid has a volume ratio of 2: 1 to 4: 1,
(Sulfuric acid + nitric acid): A method for producing a film having a slippery surface, wherein water has a volume ratio of 5: 1 to 10: 1.
delete delete The method of claim 1,
Step (b) is performed before the 5 minutes after step (a), characterized in that the manufacturing method of the film having a slippery surface.
The method of claim 1,
The lubricating oil is silicone oil, n-octane, n-decane, n-decane, n-dodecane, n-hexadecane, n-hexadecane, diesel, gasoline A process for producing a film having a slippery surface, characterized in that it is selected from crude oil and mixtures thereof.
The method of claim 1,
The step (c) is characterized in that it is carried out until the lubricant is saturated in the polymer, a method for producing a film having a slippery surface.
A film having a slippery surface in which fine wrinkles having a width of 10 to 200 μm and a depth of 10 to 60 μm are formed on the surface of the polymer film, and lubricating oil is absorbed.
The method of claim 14,
A film having a slippery surface, characterized in that the polymer is poly (dimethylsiloxane) (PDMS).
The method of claim 14,
The lubricating oil is silicone oil, n-octane, n-decane, n-decane, n-dodecane, n-hexadecane, n-hexadecane, diesel, gasoline And a slippery surface, characterized in that it is selected from crude oil and mixtures thereof.
The method of claim 14,
A film having a slippery surface, characterized in that the polymer is a transparent material.
The method of claim 14,
A film having a slippery surface, characterized by having an ice adhesion of 5 kPa or less.
The method of claim 14,
The polymer having a slippery surface, characterized in that the polymer is an elastic polymer in which poly (dimethylsiloxane) (PDMS) and silicone rubber are mixed in a weight ratio of 6: 4 to 8: 2.
The method of claim 19,
A film with a slippery surface, characterized in that it has an ice adhesion of 15 kPa or less in a state where the film is stretched 50 to 150%.

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