WO2021080285A1 - Antifouling, low-friction film for ships utilizing ultrafine protrusions and riblet structure, and method for manufacturing same - Google Patents

Abstract

The present invention relates to an antifouling, low-friction film which is for ships and utilizes ultrafine protrusions and a riblet structure, and a method for manufacturing same. Upright protrusions, which are intended to reduce frictional resistance by generating micro vortices in a film obtained by adding a self-lubricating material and an antibacterial material as an auxiliary antifouling means to thermoplastic urethane, which is a type of thermoplastic elastic body having high tensile strength and excellent wear resistance, instead increase frictional resistance due to friction with the water, and thus, in the film of the present invention, riblet-type fine protrusions having upper ends that are bent like shark scales are formed instead of upright protrusions. Also, in the case of riblet-type fine protrusions having thicker and taller protrusions, antifouling efficiency is low because there is space in the gaps between the protrusions for larvae of marine organisms to linger, and thus, in the film of the present invention, ultrafine protrusions thinner and shorter than the riblet-type fine protrusions are formed on the entire surface of the film in empty spaces without riblet-type fine protrusions so as to achieve physical antifouling. Accordingly, an eco-friendly efficient antifouling effect can be achieved while saving fuel due to the reduced frictional resistance provided by the riblet structure.

Description

Antifouling and low-friction film for ships applying ultrafine protrusion and riblet structure and its manufacturing method

The present invention relates to an antifouling and low-friction film for ships using ultrafine protrusions and riblet structures, and a manufacturing method thereof, and in more detail, two types of biomimetic technologies are applied, but the first lotus effect is achieved. The applied superfine protrusions are molded into a film to have an antifouling function to prevent marine organisms from adhering to the hull under the waterline of the ship, and secondly, a riblet type similar to the riblet structure of shark scales (形) An antifouling and low-friction film for ships applying ultra-fine protrusions and riblet structure that can reduce the frictional resistance with water when sailing a ship by simultaneously forming micro-protrusions on the film formed with super-fine protrusions and It relates to the manufacturing method.

In general, most ships operate in a state in which the lower part of the hull is submerged in water or remain moored, and offshore structures are installed in a state in which some of the offshore structures are submerged in water.

In addition, various marine organisms live in the sea, and as time passes, various marine organisms are attached to and inhabit a ship or marine structure.

Currently, a magnetic wear type (SPC: Selfpolishing Copolymer) is used to prevent fuel loss and protect the hull due to increased frictional resistance with water when sailing a ship due to the attachment of fish and shellfish including barnacles, which are marine organisms, to the hull under the waterline of the ship. type) Antifouling paint is applied.

However, such a self-wear type antifouling paint requires environmentally friendly antifouling because harmful chemical substances peeled off due to abrasion are harmful to the marine environment.

In addition, a method of applying low-friction antifouling paint to the ship's hull is also used, but this is a method in which the coating surface is lubricated with low friction so that the attachment slides away. At low speeds, it does not deviate from the hull when sailing at a certain speed or more, so fuel loss occurs when sailing at low speeds of the ship, and there is no reduction in hydrodynamic frictional resistance due to the occurrence of micro vortices, and antifouling due to low friction. There is only a function.

The present invention is a biomimetic technique, which is a superfine protrusion applied with the Lotus Effect, physically antifouling and at the same time, generating micro vortices with a riblet-type microprotrusion applying the riblet structure of shark scales. It is manufactured by adding self-lubricating material and antibacterial material as an auxiliary means for antifouling in order to save fuel by reducing frictional resistance and to give lubricity to the surface of a film made of flexible thermoplastic synthetic resin, thermoplastic elastomer or rubber. Riblet-type microprotrusions are formed in a uniform arrangement on the surface of the film, and in the blank space without riblet-type microprotrusions, in order to prevent the adhesion of marine organisms larvae in ㎛ unit size, a plurality of ultra-fine microprotrusions smaller in size than the riblet-type microprotrusions The purpose is to provide an antifouling and low friction film for ships using an ultra-fine protrusion and riblet structure that can be uniformly molded and adhered to the hull under the ship's waterline by applying an adhesive on the back of the film, and its manufacturing method. There is this.

That is, the present invention applies the lotus leaf effect to form ultra-fine protrusions smaller in size than the larvae of marine organisms on the surface of the film, so as not to provide a space for the larvae to conceive. By applying the riblet structure of scales, the riblet-shaped microprotrusions are formed on the surface of the film to reduce the frictional resistance caused by the occurrence of micro vortices in a hydrodynamic manner, and at the same time, the ultrafine protrusions and the riblet structure can save fuel of the ship. It is an object to provide an applied antifouling and low friction film for ships and a method of manufacturing the same.

In addition, the present invention has an antifouling function by simultaneously molding ultra-fine protrusions and riblet-shaped fine protrusions on a film in the same mold to prevent marine organisms from adhering to the bottom of the ship's waterline, and reduce frictional resistance with water when sailing a ship. By attaching a film to the hull, it is possible to implement two functions at the same time, and an antifouling and low friction for ships using an ultra-fine protrusion and riblet structure that can reduce the eco-friendly antifouling and hydrodynamic frictional resistance by attaching a film to the hull. Its purpose is to provide a method for producing a film.

In addition, as a non-powered ship, the antifouling and low-friction film for ships using ultra-fine protrusions that can improve the antifouling function by attaching a film made of only ultra-fine protrusions to a barge vessel with a slow ship speed or to an offshore structure in a stationary state. Its purpose is to provide a manufacturing method.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems that are not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. There will be.

In order to achieve the above object, the antifouling and low-friction film for ships applying the ultrafine protrusion and riblet structure of the present invention includes a film 100 which is adhered to the hull under the waterline of the ship by adding a self-lubricating material and an antibacterial material; A plurality of fine protrusions 200 for upright riblets are projected on the surface of the film 100, and the upper end of the fine protrusions 200 for the upright riblets is formed with shark scales as shown in FIG. It bends in the same direction and transforms into a riblet-shaped structure, and vibration is generated by friction with water due to the characteristics of a material with flexibility and elasticity, increasing the antifouling efficiency through the unstable state of the hull surface and self-cleaning. The micro vortex generated in the gap between the riblet-type microprotrusions 300 to reduce the frictional resistance hydrodynamically; The ultrafine protrusions 400 and 500 have a certain size and uniform arrangement for antifouling so that larvae of marine organisms cannot be implanted on the surface of the film 100. Fine protrusions 400 and 500; It characterized in that it comprises a.

In addition, the antifouling and low friction film manufacturing method for ships applying the ultrafine protrusion and riblet structure of the present invention prevents marine organisms from adhering to the ship's hull, and generates micro vortices hydrodynamically, thereby reducing frictional resistance during navigation. In order to save fuel by reducing, it is made of flexible thermoplastic resin, thermoplastic elastomer or rubber as a material and self-lubricating material and antibacterial material are added to the surface of the film 100. At the same time as (200), the microprotrusions (400, 500), which are smaller in size compared to the microprotrusions (200) for the riblet, for antifouling purposes, so that larvae of marine organisms cannot implant in the space where the gap between the microprotrusions (200) for the riblet (200) is wide. ) On the outer circumferential surface of the roll-type mold 700, grooves 701 for forming fine protrusions for riblets for forming the fine protrusions 200 for riblets are provided at regular intervals, and grooves 701 for forming fine protrusions for riblets and In a uniform size and uniform arrangement by a roll-type mold 700 equipped with a groove 702 for forming ultra-fine protrusions for forming the super-fine protrusions 400 and 500 between the grooves 701 for forming the fine protrusions for the riblet. Mechanically molded, the erect riblet microprotrusion 200 is transformed into a riblet microprotrusion 300 in which the upper end of the protrusion is bent in the same direction as the shark scale in the softening process, which is a post-molding process. By doing so, it is characterized in that the physical antifouling function by the ultra-fine protrusions 400 and 500 and the function of reducing frictional resistance by the riblet-type fine protrusions 300 are simultaneously performed.

In addition, the present invention is characterized in that only the ultrafine projections 400 and 500 are molded for antifouling purposes in a barge and a stationary offshore structure that is a non-powered ship.

In addition, the antifouling ultra-fine protrusions 400 and 500 are selected from the independent columnar ultra-fine protrusions 400 or the rod-shaped ultra-fine protrusions 500 connected in a horizontal and vertical grid shape, the height of the protrusion, the thickness of the column, or The thickness of the rod is 5 ~ 40㎛, and the interval between the ultrafine projections and the ultrafine projections is characterized in that 0.5 ~ 20㎛ to prevent the implantation of marine organisms larvae.

In addition, the fine protrusions 200 for riblets, which are upright for reducing the frictional resistance, are formed in a column shape with a thickness of 900 μm or less and a height of 2.0 mm or less, and are formed to have a height higher than that of the ultrafine protrusions 400 and 500, followed by a softening process. The upper part of the riblet microprotrusion is bent in the same direction as the shark scale, and transformed into a riblet microprotrusion 300 structure, and the protrusion curved to a height of 1000㎛ or less is a characteristic of a material having flexibility and elasticity. Vibration is generated by friction to increase antifouling efficiency through instability of the hull surface and self-cleaning, and micro vortices generated in the gaps between the riblet-type microprotrusions 300 and the protrusions 300 hydrodynamically reduce frictional resistance. It is characterized in that it can be structured.

On the other hand, the softening process of the present invention is a process of bending the upper end of the protrusion in an upright state in order to transform the fine protrusion 200 for an upright riblet into a riblet-shaped structure, and heating the protrusion as shown in FIG. 6 within the softening temperature range below the melting point. After softening, the upper part of the protrusion is bent to a certain height by passing it through a cooled guider mold 710 having a plate or roll-shaped releasability set to a certain height as shown in FIG. 7 to be bent and cooled to have a riblet-shaped structure. It is characterized by that.

In addition, the material of the film 100 on which the ultrafine protrusions 400 and 500 and the riblet-type fine protrusions 300 are formed is a flexible thermoplastic resin, an elastic thermoplastic elastomer, a natural rubber or synthetic that can be softened by heat. It is any one material selected from rubber, and the self-lubricating material lubricates the surface of the film 100 to increase antifouling efficiency, and to increase the ship's speed, molybdenum disulfide (MoS2), tungsten disulfide (WS2), graphite ( Graphite), a solid lubricant fine powder of hexagonal boron nitride (h-BN) or talc (Talc) is added as an additive, and the antimicrobial material is silver (Ag), copper (Cu), zinc (Zn) or A fine powder of silver (Ag), copper (Cu), or zinc (Zn) compounds or zeolite contains an antimicrobial agent, is hydrophobic for a water repellent function, and one or two or more of the antimicrobial agents are added. It is done.

In addition, the arrangement of the riblet-shaped microprotrusions 300 is characterized in that they are arranged in a grid pattern or in a honeycomb pattern in order to make the intervals with neighboring protrusions constant.

In addition, the film 100 of the present invention is a film that is connected to the hull in a vertical, left and right direction and adhered with an adhesive, and a film adhered to the connection portion of each film 100 to enhance adhesion and increase watertightness due to an increase in adhesive area The boundary surface of the step is in a stepped structure so that the lower ends of the stairs are in close contact with each other, and a connection film 900 having a thickness of 1/2 of the film 100 is adhered to the film connection groove 800, which is an upper space between the boundary surfaces. .

The antifouling and low friction film for ships using the ultrafine protrusion and riblet structure according to the present invention and its manufacturing method apply the lotus leaf effect to form the ultrafine protrusions smaller in size than the larvae of marine organisms on the surface of the film to form larvae. By not providing a space for this conception, it is environmentally friendly and antifouling in a physical way, and at the same time, fuel loss can be prevented due to a reduction in frictional resistance proportional to the antifouling efficiency, and the riblet structure of shark scales is applied. By forming the rat-shaped microprotrusions on the surface of the film, there is an effect of reducing the frictional resistance hydrodynamically, thereby further reducing the fuel of the ship.

In addition, the present invention has an antifouling function by simultaneously molding ultra-fine protrusions and riblet-type fine protrusions on a film in the same mold, thereby preventing marine organisms from adhering to the bottom of the ship's waterline, and reducing frictional resistance with water when sailing a ship. By doing so, it is possible to realize two functions that can save fuel at the same time, and by attaching a film to the hull, there is an effect of eco-friendly antifouling and hydrodynamically reducing frictional resistance.

In addition, the present invention is an eco-friendly material with high tensile strength and excellent abrasion resistance. A self-lubricating material and an antibacterial material are added to the thermoplastic urethane, which is a thermoplastic elastomer, as an auxiliary means for antifouling, and the film surface is mechanically formed by a mold for antifouling of ships. The ultra-fine protrusion and the riblet-type fine protrusion that reduces the frictional resistance of the ship are simultaneously molded to improve the speed of the ship with an eco-friendly antifouling function and a reduction function of frictional resistance, and an eco-friendly work process compared to the antifouling coating method. As a result, durability is improved and there is an economically useful effect.

In addition, in the present invention, the material of the film, ultra-fine protrusions and riblet-type fine protrusions is a thermoplastic elastomer synthetic resin or rubber having elasticity, and the vibration effect of the super-fine protrusions and riblet-type fine protrusions is high when sailing a ship, so that the self-cleaning effect is high, and It has the effect of attenuating the vibration caused by the applied turbulence and the shock of harmonics.

1 is an exemplary view showing a riblet structure of shark scales.

Figure 2 is a process diagram showing a method of manufacturing an antifouling and low-friction film for ships applying an ultrafine protrusion and a riblet structure according to the present invention.

3 is an exemplary view showing a process of softening the surface by spraying heated air on the surface of the film according to the present invention.

Figure 4 is an exemplary view showing a state in which the micro-protrusions and ultra-fine protrusions for an upright riblet are simultaneously molded using a roll-type mold on the surface of the film according to the present invention.

5 is an exemplary view showing a state in which fine protrusions and ultra-fine protrusions for an upright riblet are molded on the surface of a film according to the present invention.

6 is an exemplary view showing a state in which the fine protrusions for riblets molded on the surface of the film according to the present invention are heated to be softened to a melting point or lower.

7 is an exemplary view showing a state of bending and cooling the upper end of the fine protrusions for riblets by passing the film according to the present invention through a roll-type guider mold or a plate-type mold.

Figure 8 is an exemplary view showing a state in which the upper end of the curved riblet-shaped microprotrusions and independent columnar ultra-fine protrusions are completed on the surface of the film according to the present invention.

9 is an exemplary view showing a riblet-shaped microprotrusion with a curved upper end on the surface of the film according to the present invention and a rod-shaped ultrafine protrusion connected in a grid shape.

10 is an exemplary view showing a state in which micro vortices are generated by riblet-type microprotrusions on the surface of a film according to the present invention.

11 is an exemplary view showing a state in which riblet-shaped microprotrusions with a bent upper end are arranged in a lattice shape on the surface of a film according to the present invention.

12 is an exemplary view showing a state in which riblet-type microprotrusions are arranged in a honeycomb shape between independent columnar microprotrusions on the surface of the film according to the present invention.

13 is an exemplary view showing a state in which riblet-shaped microprotrusions are arranged in a honeycomb shape between rod-shaped microprotrusions connected in a grid shape to the surface of the film according to the present invention.

14 is an exemplary view showing a connection state of the film according to the present invention.

<Explanation of code>

100: film

200: fine protrusion for riblet

300: Riblet-type fine protrusion

400: independent columnar ultrafine protrusion

500: rod-shaped ultra-fine protrusions connected in a grid shape

600: heating air injector

700: roll mold

701: Groove for forming fine protrusions for riblets

702: groove for forming columnar ultrafine protrusions

710: Roll type guider mold

800: film connection groove

900: connection film

A film 100 to which a self-lubricating material and an antibacterial material are added and adhered to the hull under the waterline of the ship; The upright riblet microprotrusion 200 protrudes from the surface of the film 100, and the upper end of the upright riblet microprotrusion 200 is bent in the same direction as the shark scale in the softening process, which is a post-process, to form a riblet structure. As a characteristic of a material with flexibility and elasticity, vibration is generated due to friction with water, which increases the antifouling efficiency by self-cleaning and instability of the hull surface, and micro vortices generated in the gaps between the protrusions are hydrodynamically Riblet-shaped fine protrusions 300 to reduce frictional resistance; Compared to the riblet-type microprotrusions 300 in a space with a large gap between the riblet-type microprotrusions 300 on the surface of the film 100, a uniform size and uniform arrangement for antifouling so that larvae of marine organisms cannot be implanted. Ultrafine protrusions 400 and 500 protruding small; Includes.

In order to prevent the adhering of marine organisms to the ship's hull, and to reduce the frictional resistance during voyage by generating a hydrodynamic micro-vortex, self-lubricating flexible thermoplastic resin, thermoplastic elastomer, or rubber as a material is used. A larva of marine organisms is formed on the surface of the film 100 to which a substance and an antibacterial substance is added, to reduce frictional resistance, and at the same time, in the space where the distance between the microprotrusions 200 for the riblet is wide. To prevent this from being implanted, ultra-fine protrusions (400, 500), which are smaller in size than the fine protrusions 200 for riblets, are mechanically molded in the same mold with a certain size and uniform arrangement for antifouling purposes, and the fine protrusions for the upright riblet In the softening process, which is a post-molding process, the upper end of the protrusion is bent in the same direction as the shark scale, and the upper end of the protrusion is transformed into a curved riblet-shaped microprotrusion 300 structure. The physical antifouling function and the frictional resistance reduction function by the riblet-type microprotrusion 300 are simultaneously performed, and only the ultrafine protrusions 400 and 500 are molded for antifouling in the barge, which is a non-powered ship, and the stationary offshore structure.

In addition, in order to prevent the attachment of marine organisms to the ship's hull, and to reduce the frictional resistance during navigation by generating a hydrodynamic micro-vortex, it is self-lubricating with flexible thermoplastic resin, thermoplastic elastomer, or rubber as a material. On the surface of the film 100 to which substances and antibacterial substances are added, larvae of marine organisms are implanted in a space with a large gap between the upright riblet microprotrusions 200 and the riblet microprotrusions 200, which are upright for reducing frictional resistance. For antifouling, for forming the micro-protrusions (400, 500), which are smaller in size than the micro-protrusions (200) for the riblet, so that they cannot be prevented, for the riblet to form the micro-protrusions (200) for the riblet on the outer circumference of the roll-type mold (700). The micro-protrusions forming grooves 701 are provided at regular intervals, and the micro-protrusions 400 and 500 are formed between the grooves 701 for forming the fine protrusions for the riblet and the grooves 701 for forming the micro protrusions for the riblets. It is mechanically molded into a uniform size and uniform arrangement by a roll-type mold 700 equipped with a groove 702 for forming ultra-fine protrusions, and the fine protrusions 200 for the upright riblet are formed in the softening process, which is a post-forming process. By bending the upper end of the protrusion in the same direction as the shark scale and transforming the upper end of the protrusion into a curved riblet-type microprotrusion 300 structure, the physical antifouling function by the ultrafine protrusions 400 and 500 and the riblet-type microprotrusion 300 It simultaneously performs the function of reducing frictional resistance.

The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The antifouling and low friction film for ships applying the ultrafine protrusion and riblet structure according to the present invention includes a film 100 that is adhered to the hull under the waterline of the ship by adding a self-lubricating material and an antibacterial material, and the film 100 ), the upright riblet microprotrusion 200 protrudes, and the upper end of the upright riblet microprotrusion 200 is bent in the same direction as the shark scale as shown in FIG. 1 to transform it into a riblet-shaped structure. , As a characteristic of a material having flexibility and elasticity, vibration is generated due to friction with water, thereby increasing the antifouling efficiency through the unstable state of the hull surface and self-cleaning, and micro vortices generated in the gap between the protrusions as shown in FIG. Is provided with a riblet-type microprotrusion 300 that reduces frictional resistance hydrodynamically, and a larva of marine organisms can be implanted in a space where the distance between the riblet-type microprotrusions 300 is wide, so it is a riblet-type for antifouling. Compared to the microprotrusions 300, the ultrafine protrusions 400 and 500 are provided that are uniformly arranged and protrude in size.

And, the manufacturing method of the antifouling and low friction film for ships applying the ultrafine protrusion and riblet structure according to the present invention is to prepare a film 100 material to which a self-lubricating material and an antibacterial material are added as shown in FIG. Step (S100), forming the material of the film 100 into a flat film (S200), heating the surface of the flat film 100 to a melting point or less using a heating air sprayer 600 as shown in FIG. 3 to soften it. Step (S300), using a sheet making machine (sheet making M/C, roll mold 700) as shown in FIG. The step of forming the protrusion 200 (S400), the step of heating the upper portion of the molded upright riblet to a melting point below the melting point to soften the upper part (S500), the ultrafine protrusions 400 and 500 and the upright type Step of simultaneously cooling the film 100 in which the portion of the fine protrusions 200 for the riblet is softened through a roll-type guider mold 710 or a plate-shaped mold to bend and simultaneously cool the upper end of the fine protrusions 200 for the riblet (S600), It includes a step (S700) of completing the microprotrusions 400 and 500 and the riblet-shaped microprotrusions 300 on the surface.

In addition, since it is technically impossible to implement the ultra-fine protrusions 400 and 500 and the riblet-type fine protrusions 300 that are molded in a uniform size and in a uniform arrangement as described above, it is technically impossible, as in the present invention. 400, 500) and the riblet-shaped microprotrusions 300 are manufactured with a film 100 that is precisely molded by a mold and adhered to the hull.

The present invention prevents the adhering of marine organisms and generates micro vortices hydrodynamically, thereby reducing frictional resistance during navigation to save fuel, using a flexible thermoplastic resin, thermoplastic elastomer, or rubber as a material, and a self-lubricating material and On the surface of the film 100 to which the antimicrobial material is added, as shown in FIG. 4, a groove 702 for forming a columnar ultrafine protrusion and a groove 701 for forming a fine protrusion for an upright riblet are processed as shown in FIG. Antifouling so that larvae of marine organisms cannot be implanted in a space with a large gap between the upright riblet microprotrusions 200 for reducing frictional resistance by using a roll-type mold 700 and at the same time In order to form the micro-protrusions 400 and 500 that are smaller in size than the micro-protrusions 200 for the riblet, for forming the micro-protrusions 200 for the riblet on the outer circumferential surface of the roll-type mold 700 Grooves 701 are provided at regular intervals, and ultra-fine protrusions for forming ultra-fine protrusions 400 and 500 between the groove 701 for forming the fine protrusions for the riblet and the groove 701 for forming the fine protrusions for the riblet Mechanically formed in a uniform size and arrangement by a roll-type mold 700 equipped with a forming groove 702, and the upright riblet microprotrusions 200 are formed as shown in Figs. In the softening process, which is a post-process, the upper end of the upright riblet microprotrusion 200 is heated and softened, and the upper end of the protrusion is transformed into a curved riblet-shaped structure by bending it in the same direction as the shark scale using a roll-type guider mold 710. By doing so, the physical antifouling function by the independent columnar microprotrusions 400 shown in FIG. 8 or the rod-type microprotrusions 500 connected in a grid shape shown in FIG. 9 and frictional resistance due to the riblet microprotrusions 300 It will perform the reduction function at the same time.

That is, the protrusions formed on the film 100 of the present invention are two types of ultra-fine protrusions 400 and 500 and a riblet-type fine protrusion 300 in which the upper part of the protrusion is curved, and each has a constant size and The arrangement is uniform, and it is molded in the same mold to increase the efficiency of antifouling and frictional resistance reduction at the same time.

In addition, the antifouling ultra-fine protrusions 400 and 500 are selected from independent columnar ultra-fine protrusions 400 or rod-shaped ultra-fine protrusions 500 connected in a horizontal and vertical grid shape as shown in FIGS. 8 and 9. In either case, the height of the protrusion and the thickness of the column or the thickness of the rod are 5 to 40 μm, and the interval between the ultra-fine protrusion and the super-fine protrusion is preferably 0.5 to 20 μm to prevent implantation of marine organisms larva, The ultrafine protrusions 400 and 500 have a small surface area and a gap between the protrusions in the unit of micrometers (㎛), which are smaller than the size of the larvae of marine organisms, and thus do not provide a space necessary for implantation of the larvae. It can be physically antifouling by preventing the implantation of.

On the other hand, as shown in FIG. 10, a small eddy, which is a micro vortex that occurs in a gap between the riblet-type microprotrusions 300, acts like a breakwater between the turbulence of the outer wall of the hull, thereby increasing frictional resistance hydrodynamically. Since the speed of the ship is reduced by reducing it, a certain distance must be maintained between the riblet-shaped microprotrusion 300, which has a curved upper part in a riblet-like shape, and the neighboring riblet-type microprotrusion 300, to increase the speed of the ship.

Therefore, the fine protrusions 200 for riblets, which are upright for reducing frictional resistance, have a columnar shape with a thickness of 900 µm or less and a height of 2.0 mm or less, which is higher than that of the ultra fine protrusions. ) By bending the upper end of the shark in the same direction as the shark scale, and transforming it into a structure of a riblet-type microprotrusion 300, and the riblet-type microprotrusion 300 bent to a height of 1000㎛ or less, which is a characteristic of a material having flexibility and elasticity. Vibration is generated by friction with water, which increases the antifouling efficiency by self-cleaning and instability of the hull surface.

In addition, the ultra-fine vortex generated even between the ultra-fine protrusions 400 and 500 and the protrusions 400 and 500 has a small vortex effect, but the microscopic vortex generated in a certain gap between the riblet-type fine protrusions 300 and the protrusions 300 It is preferable to implement the eddy current in a structure that can increase the effect of reducing frictional resistance hydrodynamically due to a large eddy effect.

That is, the separate riblet-type microprotrusions 300 separated as described above generate micro vortices in the gap and at the same time vibrate due to friction with water, so that the hull surface becomes unstable for the implantation of larvae of marine organisms. The self-cleaning effect can increase the antifouling efficiency.

On the other hand, the present applicant has invented Korean Patent Registration No. 2022443 (name: manufacturing method of low friction antifouling lining for ships and offshore structures).

However, the fine protrusions of the low-friction antifouling lining as described above protrude upright from the surface of the film and the upper end is bent due to friction with water, but rather the frictional resistance is increased, and the spacing between the protrusions and the protrusions is wide, so the antifouling efficiency is low. There was a problem.

For example, if there are only microprotrusions of small size, the antifouling function is excellent, but there is little efficiency in reducing frictional resistance due to the riblet structure, and if there are only riblet-type microprotrusions, the frictional resistance reduction function is achieved due to the occurrence of micro vortices. It is excellent, but the antifouling efficiency is lowered because the spacing between the riblet-shaped microprotrusions, which is larger in size than the ultrafine protrusions, is wide.

Therefore, in order to coexist with the two types of protrusions according to the present invention, the ultrafine protrusions 400 and 500 and the riblet-type microprotrusion 300, they must be molded in the same mold, and in the blank space between the riblet-type microprotrusions 300 By uniformly arranging and molding the microprotrusions 400 and 500, which are relatively smaller in size than the riblet-type microprotrusions 300, the antifouling and frictional resistance reduction functions can be performed at the same time.

Specifically, the riblet-type microprotrusions 300 are thicker and higher in height than the ultra-fine protrusions 400 and 500, and the riblet-type microprotrusions independent from the lower space where the upper part of the riblet-type microprotrusions 300 is curved ( 300) Since the gap is wide and provides a space for larvae to implant, as a constant gap between them is required, the entire surface of the film 100 is uniformly formed by uniformly molding the small- sized microprotrusions 400 and 500 in such a space. It is possible to prevent the occurrence of the antifouling function in the blind spot.

In addition, when the upper end of the riblet-type microprotrusion 300 is not bent and is in an upright state, the thickness and height of the protrusion are larger than the ultrafine protrusions 400 and 500, so that frictional resistance due to friction with water when sailing a ship is Since it is a factor of increasing, it must be bent in the same direction as the shark scales as shown in Figs. 7, 8, 9, and it is effective to generate micro vortices while reducing frictional resistance as a riblet structure of shark scales as shown in Fig. 1. .

On the other hand, the material of the film 100 on which the riblet-type microprotrusions 300 and the ultrafine protrusions 400 and 500 of the present invention are molded is a material having high tensile strength and abrasion resistance, and is flexible nylon (Nylon), polyester ( It is preferable to mold it with one type of material selected from a thermoplastic resin such as polyester), an elastic thermoplastic elastomer such as TPU (Thermo Plastic Urethane), and a natural or synthetic rubber that can be deformed by heat.

The softening process of the present invention is a process of bending the upper end of the protrusion in an upright state in order to transform the softening process shown in FIG. 3 for forming the protrusion on a flat film and the fine protrusion 200 for an upright riblet into a riblet-shaped structure. 6 and 7, after heating and softening the fine protrusions 200 for riblets within the softening temperature range below the melting point, a cooled guider mold having a plate or roll-shaped release property set to a certain height ( It passes through 710 and cools at the same time as it is bent, so that the upper end of the protrusion is bent to a certain height, thereby having a structure of a riblet-shaped fine protrusion 300.

And, by lubricating the surface of the film 100 on which the ultra-fine protrusions 400 and 500 and the riblet-type fine protrusions 300 are formed, the antifouling efficiency is increased, and in order to increase the ship's speed, the self-lubricating material, which is a self-lubricating material, is used for low friction. It is preferable to add one of the solid lubricant fine powders of molybdenum disulfide (MoS2), tungsten disulfide (WS2), graphite, hexagonal boron nitride (h-BN) or talc (Talc) as an additive.

In addition, the antimicrobial material is an auxiliary means in addition to the ultrafine protrusions 400 and 500 physically antifouling for antifouling of marine organisms and the riblet microprotrusion 300, as antibacterial agents silver (Ag), copper (Cu), zinc ( Zn) or silver (Ag), copper (Cu), zinc (Zn) fine powder or zeolite containing an antimicrobial agent, hydrophobicized for water repellency, and added one or two or more of the antimicrobial agents It is desirable to do it.

Separation or elution of self-lubricating substances and antibacterial substances added because the material of the film 100 on which the ultrafine protrusions 400 and 500 and the riblet-shaped fine protrusions 300 according to the present invention are formed is excellent in high tensile strength and abrasion resistance There is little concern about pollution of the marine environment due to this, and since the surface hardness of antifouling paint is relatively low, there is a great concern about pollution of the marine environment due to peeling.

And, in the case where the material is an elastic material such as TPU (thermoplastic urethane) or rubber, which is a kind of thermoplastic elastomer, the protrusion part during sailing a ship increases vibration due to friction with water, so that the self-cleaning effect is high, and the turbulence applied to the hull and The elastic material has the effect of attenuating the impact caused by harmonics.

Mechanical molding of the film 100 according to the present invention is carried out by a calendar molding machine (Sheet making M/C).

That is, calendar M/C, roll-type mold 700), vacuum molding, and heat-compression molding are performed in any one of the methods, and the mold is manufactured by laser, etching, and electric discharge processing.

In addition, the micro-protrusions 400 and 500 and the micro-protrusions 200 for riblets are simultaneously molded in the same mold, and the micro-protrusions for riblets 200, which are formed in an upright state, are bent in a post process so that the upper part of the protrusion is It transforms into a curved riblet-type microprotrusion 300.

The post-process is a softening process as described above, and after heating the upright riblet microprotrusions 200 in an upright state to a softening temperature range below the melting point, as shown in FIGS. 6 and 7, there is releasability, and there is a constant cooling state. It is a process in which the upper end of the protrusion is transformed into a riblet-shaped fine protrusion 300 in which the upper end of the protrusion is bent by passing through a plate material or roll-type guider mold 710 set to the height and cooling at the same time. It is higher than the height of the fine protrusions 400 and 500 and can be selectively bent.

The softening process for forming the protrusions on the flat film 100 and the heating method of the softening process for bending the upright protrusions as described above are non-contact type by spraying heated air, heating using radiant heat, and a contact type roll type for heat conduction. It is heated by passing it through the heating device of, and it is preferable to select and carry out one of the heating methods.

The ultrafine protrusions 400 and 500 of the present invention are separated from each other and are independent columnar 400 or a bar type 500 as a continuous protrusion in a grid type, but the height of the protrusion and the thickness of the column or the bar The thickness is 5~40㎛, and the interval between the ultrafine protrusions and the superfine protrusions is 0.5~20㎛, minimizing the space for larvae of marine organisms to implant, so that the film 100 has a uniform size and uniform arrangement on the entire surface. It is molded with, and chooses either a column shape or a rod shape.

In addition, the fine protrusions 200 for riblets are in the shape of a column, and the size varies according to the resistance of water for each position of the hull, and the thickness of the column is 900 µm or less, and the height is 2.0 mm or less, and the upper end of the protrusion is It is preferable to bend and transform into a riblet-shaped microprotrusion 300 having a height of 1000 μm or less.

Further, the riblet-shaped microprotrusions 300 are molded on the entire surface of the film 100 in which the ultrafine protrusions 400 and 500 are uniformly arranged, and the arrangement is as shown in FIGS. Likewise, it is arranged in a grid pattern or in a honeycomb pattern in order to make the gaps with neighboring protrusions constant, and it is preferable to select one of them.

On the other hand, the film 100 of the present invention is a plurality of the hull as shown in Fig. 14 are connected and arranged in the vertical, left and right direction to be bonded with an adhesive, and the connection portion of each film 100 is strengthened due to the increase in the adhesive area and In order to increase watertightness, the interface of the film 100 that is in close contact with each other is formed in a stepped structure, so that the lower ends of the steps are in close contact with each other, and a film connection groove 800 is provided in the upper space between the interface to have a thickness of 1/2 of the film 100. By adhering the connection film 900 to the film connection groove 800, the adhesion and watertightness may be improved.

The antifouling and low-friction film for ships applying the ultrafine protrusions and riblet structure of the present invention and its manufacturing method apply a lotus leaf effect to form ultrafine protrusions smaller in size than the larvae of marine organisms on the surface of the film. By not providing a space for larvae to implant, it is environmentally friendly antifouling by a physical method, and at the same time, fuel loss can be prevented due to a reduction in frictional resistance proportional to the antifouling efficiency, and the riblet structure of shark scales is applied. By forming the riblet-shaped microprotrusions on the surface of the film, you can reduce the frictional resistance hydrodynamically to save fuel on the ship, and by molding the ultra-fine protrusions and the riblet-shaped microprotrusions on the film at the same time in the same mold, they have an antifouling function. It prevents marine organisms from adhering to the bottom of the ship's waterline, reduces the frictional resistance with water when sailing the ship to save fuel, and implements two functions at the same time, and eco-friendly antifouling and fluid by attaching a film to the hull. It is possible to reduce the mechanical frictional resistance.

In the above, although specific embodiments of the present invention have been described and illustrated, the present invention is not limited to the described embodiments, and various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have. Therefore, such modifications or variations should not be individually understood from the technical spirit or viewpoint of the present invention, and the modified embodiments should be said to belong to the claims of the present invention.

The present invention applies two kinds of biomimetic technologies, but by forming superfine protrusions applying the lotus effect, which is a biomimetic technology, into a film to have a physical antifouling function, At the same time, it prevents marine organisms from adhering to the surface, and simultaneously molds the riblet-type microprotrusions that apply the riblet structure of shark scales to the film formed with ultra-fine protrusions to generate micro vortices. In order to save fuel by reducing frictional resistance, and to prevent attachment of marine organisms larvae in µm unit size in the blank space without riblet-type microprotrusions, a plurality of ultra-fine protrusions, which are smaller in size than the riblet-type microprotrusions, are uniformly molded. , By applying adhesive on the back side of the film and bonding it to the hull under the waterline of the ship, it is possible to reduce environmentally friendly antifouling and hydrodynamic frictional resistance, and does not provide a space for larvae to implant, and friction due to the occurrence of micro vortices. It is an optimal invention that can reduce the resistance and save fuel of the ship.

Claims (11)

1. A film 100 to which a self-lubricating material and an antibacterial material are added and adhered to the hull under the waterline of the ship;

   The upright riblet microprotrusion 200 protrudes on the surface of the film 100, and the upper end of the upright riblet microprotrusion 200 is bent in the same direction as the shark scale in the softening process, which is a post-process, to form a riblet structure. As a characteristic of a material with flexibility and elasticity, vibration is generated due to friction with water, which increases the antifouling efficiency by self-cleaning and instability of the hull surface, and micro vortices generated in the gaps between the protrusions are hydrodynamically Riblet-shaped fine protrusions 300 to reduce frictional resistance;

   Compared to the riblet-type microprotrusions 300 in a space with a large gap between the riblet-type microprotrusions 300 on the surface of the film 100, a uniform size and uniform arrangement for antifouling so that larvae of marine organisms cannot be implanted. Ultrafine protrusions 400 and 500 protruding small;

   Antifouling and low-friction film for ships applying ultrafine protrusions and riblet structures comprising a.
2. In order to prevent marine organisms from adhering to the ship's hull and to reduce the frictional resistance during voyage by generating micro vortices hydrodynamically, a self-lubricating material made of flexible thermoplastic resin, thermoplastic elastomer or rubber as a material and On the surface of the film 100 to which the antibacterial material is added, the upright riblet microprotrusions 200 are formed to reduce frictional resistance, and at the same time, the larvae of marine organisms are implanted in the space where the distance between the microprotrusions 200 for the riblet is wide. For antifouling purposes, microprotrusions 400 and 500, which are smaller in size than the fine protrusions 200 for riblets, are mechanically molded in the same mold with a certain size and uniform arrangement, and the fine protrusions for the upright riblet 200 ) Is a physical antifouling due to the ultrafine protrusions 400 and 500 by bending the upper end of the protrusion in the same direction as the shark scale in the softening process, which is a post-molding process, and transforming the upper end of the protrusion into a curved riblet-shaped microprotrusion 300 structure. It performs the function and the function of reducing frictional resistance by the riblet-type fine protrusions 300 at the same time, and it is characterized in that only the ultra-fine protrusions 400 and 500 are molded for antifouling purposes in a barge, which is a non-powered ship, and a stationary offshore structure. Method for producing antifouling and low friction film for ships using ultrafine protrusion and riblet structure.
3. A self-lubricating material made of flexible thermoplastic resin, thermoplastic elastomer, or rubber as a material to prevent marine organisms from adhering to the ship's hull and to reduce frictional resistance during navigation by generating micro vortices hydrodynamically. On the surface of the film 100 to which an antibacterial substance is added, larvae of marine organisms can be implanted in a space with a large gap between the microprotrusions 200 for riblets, which are upright for reducing frictional resistance, and the microprotrusions 200 for riblets at the same time. In order to form the micro-protrusions 400 and 500 that are smaller in size than the micro-protrusions 200 for the riblet for antifouling purposes, the fine protrusions for the riblet to form the micro-protrusions 200 for the riblet on the outer peripheral surface of the roll-type mold 700 Forming grooves 701 are provided at regular intervals, and a second for forming ultra-fine protrusions 400 and 500 between the groove 701 for forming the fine protrusions for the riblet and the groove 701 for forming the fine protrusions for the riblet. The fine protrusions are mechanically formed in a uniform size and arrangement by a roll-type mold 700 equipped with a groove 702 for forming the fine protrusions, and the micro protrusions 200 for the upright riblets are formed by the softening process, which is a post-molding process. By bending the upper end in the same direction as the shark scale and transforming the upper end of the protrusion into a curved riblet-type microprotrusion 300 structure, the physical antifouling function by the ultrafine protrusions 400 and 500 and friction due to the riblet microprotrusion 300 A method of manufacturing an antifouling and low friction film for ships using an ultra-fine protrusion and a riblet structure, characterized in that it performs a resistance reduction function at the same time.
4. The method of claim 3,

   The antifouling ultrafine protrusions 400 and 500,

   The height of the protrusion, the thickness of the column, or the thickness of the rod in any one selected from the independent columnar ultrafine protrusions 400 or the rod-shaped superfine protrusions 500 connected in a horizontal and vertical lattice shape is 5 to 40㎛, and the ultrafine protrusions and the superfine protrusions A method of manufacturing an antifouling and low-friction film for ships employing an ultra-fine protrusion and a riblet structure, characterized in that the spacing between the fine protrusions is 0.5 to 20 μm to prevent the implantation of marine organisms larvae.
5. The method of claim 3,

   The fine protrusions 200 for upright riblets for reducing frictional resistance,

   After forming a column with a thickness of 900 μm or less and a height of 2.0 mm or less so that the height is higher than that of the ultrafine protrusions, in the softening process, the upper end of the riblet fine protrusion 200 is bent in the same direction as the shark scale, The protrusion is transformed into a structure of the protrusion 300, and the protrusion that is bent to a height of 1000 µm or less is a characteristic of a material having flexibility and elasticity, and vibration is generated by friction with water, thereby increasing the antifouling efficiency through instability of the hull surface and self-cleaning , Micro-vortex generated in the gap between the riblet-type microprotrusions 300 and the protrusions 300 is a structure capable of reducing frictional resistance hydrodynamically. And manufacturing method of low friction film.
6. The method of claim 3,

   The softening process is a process of bending the upper part of the upright protrusion in order to transform the erect fine protrusion 200 into a riblet-shaped structure.After softening the protrusion within the softening temperature range below the melting point, it is set to a certain height. Ultra-fine protrusion and riblet structure characterized in that the upper end of the protrusion is bent to a certain height by passing through a cooled guider mold 710 having a releasable plate or roll shape, and cooling at the same time. Method of manufacturing applied antifouling and low friction film for ships.
7. The method of claim 3,

   The material of the film 100 on which the ultrafine protrusions 400 and 500 and the riblet-type fine protrusions 300 are formed is a flexible thermoplastic resin, an elastic thermoplastic elastomer, a natural rubber or synthetic rubber that can be softened by heat. A method of manufacturing an antifouling and low friction film for ships using an ultrafine protrusion and a riblet structure, characterized in that it is any one material selected.
8. The method of claim 3,

   The self-lubricating material lubricates the surface of the film 100 to increase antifouling efficiency, and to increase the ship's speed, molybdenum disulfide (MoS2), tungsten disulfide (WS2), graphite, hexagonal boron nitride (h-) A method of manufacturing an antifouling and low friction film for ships using ultrafine protrusions and riblet structures, characterized in that one of the fine powders of solid lubricants of BN) or talc is added as an additive.
9. The method of claim 3,

   The antibacterial material contains an antimicrobial agent in fine powder or zeolite of silver (Ag), copper (Cu), zinc (Zn) or silver (Ag), copper (Cu), zinc (Zn) compound, and has a water repellent function. A method for producing an antifouling and low-friction film for ships using ultrafine protrusions and a riblet structure, characterized in that it is hydrophobized for, and one or two or more of the antimicrobial agents are added.
10. The method of claim 5,

    The riblet-shaped microprotrusions 300 are arranged in a grid pattern or in a honeycomb pattern in order to make the interval with neighboring protrusions constant. Method of manufacturing applied antifouling and low friction film for ships.
11. The method according to claim 1,

    A plurality of the films 100 are connected to the hull in the vertical, left and right directions and adhered with an adhesive, but at the connection portions of each film 100, the interface of the film that is closely adhered is stepped to enhance the adhesion and watertightness due to the increase in the adhesive area. As a structure, the lower ends of the steps are in close contact with each other, and a connection film 900 having a thickness of 1/2 of the film 100 is adhered to the film connection groove 800, which is an upper space between the boundary surfaces. Antifouling and low friction film for ships with riblet structure applied.

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