KR101675335B1 - Functional fabric for reducing air resistance and sports wear prepared by using the same - Google Patents

Abstract

Provided are a functional fabric for reducing air resistance, and a sportswear manufactured by using the same. The functional fabric comprises: a ground fabric; a coating layer located on one side of the ground fabric, and including a first polyurethane resin; and an adhesive layer arranged between the ground fabric and a film layer, and including a second polyurethane resin-based adhesive. The coating layer has a dimple pattern, and thus is useful for a jersey pursuing high speed.

Description

TECHNICAL FIELD [0001] The present invention relates to a functional fabric having reduced air resistance and a sportswear made of the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

The present invention relates to an air resistance reducing functional fabric useful for a speed suit, and sports wear manufactured using the same.

The sports game that pursues speed has made a great deal of research and made remarkable progress to improve the performance. In many countries, I have made a lot of efforts in the fields of apparatus, materials, etc., and I have been studying the correlation between the external design and the body motility part. However, as the speed of the race is getting faster and faster, the researches on friction resistance and aerodynamics are focused on and improve the performance of the athletes.

Looking at the aerodynamics applied to sports, it is made of fabric with small triangular projections like shark skin, swimwear that imitates the skin of a shark flowing along the body without water sticking to the athlete's body, small bumps on the crown and sole A golf driver that induces faster air flow, a helmet designed to make the overall shape of the head like a wing, a dimple of a golf ball, and the like.

As the words "Kyung-Bok is a high-tech science", the competition in the development of sports games in the world and the competition of the world's famous sporting goods companies are getting more and more intense, and ergonomic and air- For development, researches on textile materials and products that minimize air resistance, minimize friction, lightweight, support muscular strength, and feel fit should be continued. At the same time, to design the ergonomic apparel system, we developed the optimal platform material combination technique by deriving the application materials for each part according to the posture and operation, and applied the sewing technique and the muscle movement according to the posture while applying the fit of the wearer and minimizing the air resistance. Based ergonomic pattern design and design technology.

Korean Patent No. 10-0655628 Korean Patent No. 10-0848857

A first technical object to be solved by the present invention is to provide an air resistance reducing functional fabric and a manufacturing method thereof.

A second technical problem to be solved by the present invention is to provide a sportswear which is manufactured using the fabric and can exhibit a speed improvement effect.

A third object of the present invention is to provide a speed skating suit manufactured using the fabric.

According to an aspect of the present invention, A coating layer located on one side of the base fabric and comprising a first polyurethane resin; And an adhesive layer positioned between the base fabric and the film layer and comprising a second polyurethane resin adhesive, wherein the coating layer has a dimple pattern.

According to another embodiment of the present invention, there is provided a method for forming a coating film, comprising the steps of: applying a composition for forming a film layer containing a first polyurethane resin and a first organic solvent on a mold for forming a dimple pattern; Applying an adhesive layer forming composition comprising a second polyurethane resin, a crosslinking agent, a catalyst and a second organic solvent on the coating layer to form an adhesive layer; And a step of positioning the base fabric on the adhesive layer and then assembling the base fabric. The present invention also provides a method of manufacturing the above air resistance reducing functional fabric.

According to another embodiment of the present invention, there is provided a sportswear manufactured using the above air resistance reduction functional fabric.

According to another embodiment of the present invention, there is provided a speed skating suit manufactured using the above air resistance reducing functional fabric.

The air resistance reduction functional fabric according to the present invention is particularly useful for a competition suit, especially a speed skating suit, for speed pursuit by significantly reducing the air resistance by the dimple pattern formed on the polyurethane resin-containing coating layer. In addition, since the coating layer contains a polyurethane resin controlled to have physical properties required for a competition suit, especially a winter sports suit, the effect of reducing the air resistance, excellent muscle supporting effect, .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description of the invention, It should not be construed as limited.
1 is a graph showing the results of moisture permeability evaluation of the functional fabric prepared in Examples 2-1 to 2-4 and Examples 3-1 to 3-4.
2 is a graph showing the results of water resistance evaluation on the functional fabric prepared in Examples 2-1 to 2-4 and Examples 3-1 to 3-4.
Fig. 3 is a photograph showing the surface of the air resistance reducing functional fabric formed with the embossed or embossed pattern according to Example 4 (a) an engraved pattern, and b) a relief pattern).
FIG. 4 is a photograph of air resistance reduction functional fabrics according to an embodiment of the present invention having six pattern shapes.
FIG. 5 is a lattice of the surface of the air resistance reducing functional fabric created for the computational fluid analysis simulation.
6 is a boundary layer lattice of the air resistance reduction functional fabric.
FIG. 7 is a space grid for calculating the space from the outer boundary of the fabric pattern to the boundary of the calculated domain remote boundary.
8 shows the result of observing the simulation domain size.
Fig. 9 shows the results of observing the surface friction coefficient distribution of the air resistance reducing functional fabric according to various cases.
10 is a graph showing the air resistance performance evaluation result of the air resistance reduction functional fabric according to the present invention through the wind tunnel test.

Hereinafter, the present invention will be described in detail in order to facilitate understanding of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

In the present invention, the dimple pattern is formed on the surface of the fabric during the production of the fabric for speed sportswear, thereby reducing the shape resistance and consequently reducing the frictional resistance of the air, thereby improving the speed. By controlling the composition of the polyurethane resin at the time of coating layer formation,

That is, according to one embodiment of the present invention,

Base fabric;

A coating layer located on one side of the base fabric and comprising a first polyurethane resin; And

An adhesive layer positioned between the base fabric and the film layer and comprising a second polyurethane resin adhesive,

The coating layer has a dimple pattern.

The dimple pattern in the coating layer may be at least one of embossing and engraving, and may be an engraving pattern having an effect of reducing the shape resistance.

The dimple pattern may have a structure of at least one of a surface lattice and a space lattice. More specifically, when the dimple pattern has a spatial lattice structure, the dimple pattern may be a boundary layer lattice structure for describing a viscosity adhered to a target wall surface, or a remote space lattice structure for describing a flow phenomenon in a boundary layer outer space. In addition, the dimple pattern may be formed in a spacial space lattice structure spaced apart by a distance of 0.8 to 1 times the tip end of the functional fabric and a distance of 2 to 3 times the length of the dimple pattern on the basis of the dimple pattern length, The distance can be increased more and more. When formed in this way, it is possible to obtain a better air resistance reduction effect.

In addition, the dimple pattern may include a dimple having a single size within an average diameter of 0.1 mm to 50 mm, or may include two or more dimples having different sizes. Specifically, the dimple pattern formed on the coating layer in the air resistance reducing functional fabric according to an embodiment of the present invention includes: a first dimple having an average diameter of 0.1 mm to 3.0 mm; A second dimple of greater than 3.0 mm but less than 3.5 mm; And a third dimple of greater than 3.5 mm but no greater than 5.0 mm.

The coating layer on which the dimple pattern is formed may have a dimple number (3 x 3 cm) per reference area of 70 to 80, more specifically 75 to 78. It is possible to exhibit a better air resistance reducing effect than when the dimpled dimple pattern is included.

In addition, the coating layer preferably has a thickness of 0.15 mm or more, and more preferably 0.15 to 40 탆, more specifically 0.3 to 20 탆, in consideration of the effect of reducing the air resistance. If the thickness of the coating layer is less than 0.15 mm, it is difficult to sufficiently express the dimple pattern, so that it is difficult to obtain an effect of reducing the air resistance, and the water pressure resistance is insufficient, and the moisture-proof and waterproof effect may be deteriorated. On the other hand, if it exceeds 40 탆, air bubbles may be generated on the surface of the coating layer due to volatilization of the solvent during drying to form a coating layer, and the thickness of the final functional fabric is excessively thick, which is not preferable in view of activity and is also uneconomical.

The first polyurethane resin contained in the coating layer is a polymer compound composed of OH (hydroxyl group) and NCO (isocyanate) bond, and the physical properties are determined depending on the molecular weight and degree of polymerization of the polyol. In particular, winter sports such as speed skating run at an average temperature of -5 ° C to -15 ° C, and because of the long playing time including waiting time, functional fabrics are used not only for muscle support and air resistance to improve athletic performance, The performance retention rate should be considered when exposed for a long time. That is, if the coating layer is exposed to a low-temperature environment, external moisture may penetrate into the game clothes to deteriorate the adhesion, which may adversely affect the performance of the sports. Therefore, It is required to have excellent flexing resistance in order to shorten the damage. Accordingly, it is desirable to select and apply a polyurethane resin that is optimized for the requirements for winter sports wear, especially for a premium skating suit, specifically for muscle support, air resistance reduction and flexural resistance.

Specifically, the first polyurethane resin preferably has a 100% modulus of 35 to 70 kgf / cm 2, more specifically 45 to 65 kgf / cm 2, a tensile strength (TS) of 400 to 500 kgf / 750%.

The first polyurethane resin contains polyurethane as a solid component and an organic solvent as a non-solid component. The solid content of the first polyurethane resin is 28 to 32 wt%, the viscosity at 25 DEG C is 60,000 to 90,000 cps, Can be from 70,000 to 90,000 cos. The organic solvent may be a conventional organic solvent such as dimethylformamide or methyl ethyl ketone.

In the first polyurethane resin, the polyurethane may be specifically a polyether urethane, a polyester urethane or a polycarbonate urethane, and any one or a mixture of two or more thereof may be used. In terms of the flex resistance, the polyester polyol and the aromatic diisocyanate may be produced by reacting.

In addition, the first polyurethane resin may have an NCO index of 30 to 50, more preferably 40 to 50. When the above-described NCO index is obtained, it is possible to exhibit a better moisture-proof and waterproof function.

The coating layer may further include a filler for minimizing surface friction.

The filler may be specifically titanium dioxide (TiO2), silicon dioxide (SiO2), or the like, and may include any one or two or more of them. The filler may be included in an amount of 0.1 to 10 parts by weight, more specifically 0.1 to 3 parts by weight, and more particularly 0.1 to 1 part by weight based on 100 parts by weight of the first polyurethane resin. When the content is in the above range, surface friction can be minimized while the coating layer maintains high smoothness.

In addition, the coating layer may contain up to 20 parts by weight, more preferably 1 to 20 parts by weight, based on 100 parts by weight of the polyurethane resin, of one or more other additives such as a dye, a surfactant, a crosslinking agent, a catalyst, a stabilizer, .

Meanwhile, in the above air resistance reducing functional fabric, the base fabric may be woven fabric or knitted fabric using 10 to 30 wt% of span and 70 to 90 wt% of polyester. More preferably 10 to 30% by weight of span of 30 to 50 denier; And 40 to 50 denier / 20 to 80 filaments, and the base fabric having the above-mentioned characteristics can exhibit excellent mechanical properties.

In the above air resistance reducing functional fabric, the adhesive layer may be in various forms such as a film, a dot, and a sprite. In the air resistance reducing functional fabric, the adhesive layer may be various forms such as a base, The stretchability can be increased without deteriorating the waterproof property.

The adhesive layer may comprise a second polyurethane resin adhesive.

The base fabric is laminated to the coating layer. When a difference in tensile strength between the base fabric and the coating layer is large, a curling phenomenon occurs. Therefore, it is preferable to match the physical strength of the base fabric and the coating layer.

Accordingly, in the polyurethane resin adhesive contained in the adhesive layer, the second polyurethane resin contains polyurethane as a solid component and an organic solvent as a non-solid component and has a solid content of 58 to 62 wt% May have a viscosity of 60,000 to 80,000 cps. At this time, the organic solvent may be a conventional organic solvent such as dimethylformamide, methyl ethyl ketone and the like.

The second polyurethane resin may have a 100% modulus of 10 to 20 kgf / cm 2, a tensile strength (TS) of 500 to 600 kgf / cm 2, and an elongation of 600 to 700%.

In the second polyurethane resin, the polyurethane may be specifically a polyether urethane, a polyester urethane or a polycarbonate urethane, and any one or a mixture of two or more thereof may be used.

The adhesive layer may further contain at least 10 parts by weight, more preferably 0.001 to 10 parts by weight, based on 100 parts by weight of the polyurethane resin, of one or more other additives such as a crosslinking agent, a catalyst, a chain extender, an antioxidant, .

The air resistance reducing functional fabric having the above-mentioned structure is formed by applying a film layer forming composition containing a first polyurethane resin and a first organic solvent onto a mold for forming a dimple pattern and drying to form a coating layer One); A step (step 2) of forming an adhesive layer on the coating layer by applying a composition for forming an adhesive layer comprising a second polyurethane resin, a crosslinking agent, a catalyst and a second organic solvent; And placing the base fabric on the adhesive layer and then pouring (step 3). Each step will be described in detail below.

(Step 1)

Step 1 for manufacturing an air resistance reducing functional fabric according to an embodiment of the present invention is a step of forming a coating layer having a dimple pattern using a mold having a dimple pattern formation.

Specifically, the coating layer may be formed by: (i) preparing a composition for forming a coating layer by mixing a first polyurethane resin and a first organic solvent; And (ii) casting the composition for forming a coating layer on a mold for forming a dimple pattern, followed by drying.

The first polyurethane resin is as described above.

Specific examples of the first organic solvent include ketone solvents such as methylethylketone, acetone, diethylketone or methylisobutylketone; Ether-based solvents such as tetrahydrofuran, 1,4-dioxane or oxetane; Or petroleum ether, and any one or a mixture of two or more of them may be used. The petroleum ether may be composed of pentane or hexane, which is a volatile petroleum oil fraction having a boiling point of 30 ° C to 70 ° C.

More specifically, the first organic solvent may be an organic solvent having a boiling point of 70 ° C or more and less than 110 ° C, an organic solvent having a boiling point of 110 ° C or more and less than 140 ° C, and a solvent having a boiling point of 140 ° C to 180 ° C And organic solvents selected from the above-mentioned organic solvents. Specifically, methyl ethyl ketone (MEK) is used as an organic solvent having a boiling point of 70 ° C. or more and less than 110 ° C., toluene is used as an organic solvent having a boiling point of 110 ° C. or more and less than 140 ° C., Dimethylformamide (DMF) can be used as the organic solvent. As described above, by using an organic solvent having a different boiling point and evaporating the organic solvent in succession at different drying temperatures, it is advantageous in forming a dense coating layer having non-swelling property upon water absorption.

When MEK of an organic solvent having a boiling point of 70 ° C or more and less than 110 ° C, toluene being an organic solvent having a boiling point of 110 ° C or more and less than 140 ° C and DMF being an organic solvent having a boiling point of 140 ° C to 180 ° C are mixed, The use of DMF: TOl: MEK = 1: 2.0 to 3.0: 1.0 to 1.5 weight ratio is advantageous for forming a coating layer with a dense structure.

The first organic solvent may be used in an amount such that the composition for forming a coating layer has an appropriate viscosity. If the content of the first organic solvent is too small, the viscosity of the composition itself becomes too high, which may result in poor moldability. If the content is too large, the viscosity may become too low and the moldability may be deteriorated. Specifically, the first organic solvent may be contained in an amount such that the viscosity of the composition for forming a coating layer is 3,000 cps to 4,000 cps (25 ° C), preferably 3,500 cps to 4,000 cps (25 ° C). If the viscosity is less than 3,000 cps, it is difficult to form a spherical structure layer, and there may be a problem that the water pressure is extremely reduced due to the formation of pores. When the viscosity is higher than 4,000 cps, uniform film formation is difficult, It is because.

When the coating layer further comprises a filler for minimizing the surface friction coefficient, the composition for forming a coating layer may further include fillers such as titania and silica in the amounts described above.

The dimple pattern forming mold has a reverse image of the dimple pattern formed on the coating layer. The dimple pattern is the same as described above.

The material of the mold is not particularly limited, and may be polypropylene, polyester, or the like. The material of the mold is preferably made of a material having a low surface tension so as to facilitate separation from the coating layer thereafter. Specifically, the mold may be a substrate having a surface tension of 40 dyne / cm or less, polypropylene having a surface tension of 20 to 40 dyne / cm, or a polyester having a surface tension of 25 to 40 dyne / cm.

The casting may be carried out using a doctor knife coater, a roll coater, a dot, or the like, although the casting may be performed by a general method used in the art. .

Also, the drying step may be performed at a temperature of 50 ° C to 180 ° C, or may be performed in two or more stages. The temperature condition at the time of drying by a multistage may be the same or may be different.

Concretely, in the initial drying step, the drying time is 30 seconds to 5 minutes at a temperature below the boiling point of the organic solvent, for example, at a drying temperature of less than 90 ° C, preferably at a drying temperature of 60 ° C to 90 ° C Lt; / RTI > In this case, the organic solvent having a low boiling point such as MEK is preferentially evaporated and the applied coating layer forming composition starts to be concentrated. Next, in the medium-term drying step, it is secondarily dried at a temperature of 90 ° C or more and less than 110 ° C for 30 seconds to 120 seconds. During this secondary drying step, the composition for forming a coating layer is concentrated, the surface tension is increased, and the cohesive force is increased. In the third drying step, the drying is carried out at a drying temperature of 110 ° C or higher, preferably 110 ° C to 180 ° C for 30 to 120 seconds. The organic solvent remaining in the tertiary drying process is evaporated and densely solidified to form a uniform nonporous sponge structure, preferably a nonporous monolith sponge structure, and can be solidified and stabilized in the form of a film.

The casting of the composition for forming a coating layer may be performed once or twice, and more specifically, may be performed twice. The drying process may be performed after each casting process at least two times, and the drying process performed in each step may be performed in one step at a temperature of 50 to 180 DEG C, or at a different temperature condition as described above Can be performed in multiple stages. When the casting process is carried out in two or more stages and the drying process is carried out between each casting process, the removal of the first organic solvent in the composition for forming a coating layer can be efficiently removed to form a dense coating layer Also, it is possible to prevent the deterioration of the peelability of the mold due to the first residual organic solvent and the deterioration such as tearing of the mold pattern, thereby improving the dispersibility and thickness uniformity of the constituent material of the coating layer .

A coating layer having a dimple pattern formed from the mold is formed by the above-described process.

(Step 2)

Step 2 for the production of the functional fabric according to an embodiment of the present invention is characterized in that in the coating layer prepared in Step 1, an adhesive layer is formed on the side on which the dimple pattern is not formed, .

Specifically, the adhesive layer can be produced by applying a composition for forming an adhesive layer containing a second polyurethane resin, a crosslinking agent, a catalyst and a second organic solvent on a coating layer by a method such as casting and drying.

The second polyurethane resin contained in the adhesive layer is as described above, and the second organic solvent may be the same as the first organic solvent described above. The second organic solvent may also be a mixture of two or more kinds of solvents. Specifically, MEK of an organic solvent having a boiling point of 70 ° C or more and less than 110 ° C, toluene being an organic solvent having a boiling point of 110 ° C or more and less than 140 ° C, It is advantageous to form an adhesive layer having a dense structure by using DMF as an organic solvent at a ratio of DMF: TOl: MEK = 1: 1.0 to 1.5: 2.0 to 3.5.

The crosslinking agent is not particularly limited, but an isocyanate compound, an epoxy compound, an aziridine compound, or a metal chelate may be used. Specifically, examples of the isocyanate compound include aromatic isocyanates such as tolylene diisocyanate and xylene diisocyanate; Cycloaliphatic isocyanates such as isophorone diisocyanate; Aliphatic isocyanates such as hexamethylene diisocyanate; Or an isocyanate adduct body. As the isocyanate adduct sieve, an adduct of a dihydric alcohol compound such as diisocyanate and trimethylolpropane may be used. As the epoxy compounds, polyepoxy compounds such as bisphenol A and epichlorohydrin condensate type epoxy compounds can be used. These compounds may be used singly or as a mixture of two or more kinds.

The crosslinking agent may be included in an amount of about 0.05 to about 15 parts by weight based on 100 parts by weight of the polyurethane resin (on a solid basis). When it exceeds 15 parts by weight, the residual stress can be relaxed by the excessive crosslinking reaction. If the amount of the crosslinking agent is less than 0.05 part by weight, the degree of crosslinking is insufficient and the cohesive force becomes small, so that the physical properties of the adhesion durability and the cutting property may be deteriorated. Preferably from about 0.1 to about 10 parts by weight, and more preferably from about 0.1 to about 5 parts by weight.

The catalyst may be specifically a tertiary amine compound or an organometallic compound. Examples of the tertiary amine compound include triethylamine, dimethylcyclohexylamine, N-methylmorpholine, N, N'-dimethylpiperazine, 2- (dimethylaminoethoxy) ethanol or diazabicyclo 2) -octane. Examples of the organometallic compounds include tin diacetate, tin dioctoate, tin di-laurate, dibutyl tin dilaurate, magnesium acetylacetonate, nickel acetylacetonate, magnesium stearate, cadmium stearate , 1,8-diazabicyclo [5,4,0] undec-7-ene, and any one or a mixture of two or more thereof may be used. The amount of the catalyst and the kind of the catalyst can be appropriately controlled by process conditions such as the polyurethane resin content, the temperature of the reactor, the residence time, etc. Specifically, 0.001 to 1 part by weight can be used per 100 parts by weight of the polyurethane resin have.

The composition for forming an adhesive layer may further include at least one additive such as a chain extender, an antioxidant or a UV stabilizer for improving the adhesive effect in the adhesive layer and improving the mechanical properties and chemical stability of the adhesive layer It is possible. Specifically, the additive may be used in an amount of not more than 5 parts by weight, specifically 0.01 to 5 parts by weight, based on 100 parts by weight of the polyurethane resin within a range not lowering the physical properties of the adhesive layer.

Specific examples of the chain extender include ethyleneglycol (EG), 1,4-butanediol, 1,4-BD, 1,6-hexanediol, 1,6-hexanediol, -HD), 1,2-propylene glycol, 1,2-PG, 1,3-propanediol, 1,3-PDO, neopentylglycol , NPG), 2-methyl-1,3-propanediol, 2-MPD, 3-Methyl-1,5-pentanediol, 3-MPD), or 2-butyl-2-ethyl-1,3-propanediol (BEPD). Of these, Mixtures may be used.

After the preparation of the composition for forming an adhesive layer containing the above-mentioned components, the composition is applied onto the coating layer prepared in the step 1 according to a conventional method. At this time, depending on the form of the adhesive layer in the functional fabric, the composition for forming an adhesive layer may be applied to the whole coating layer or may be partially applied to have a specific pattern. Specifically, as described above, the adhesive layer may be applied in the form of a dot so as to have a dot pattern.

The coating may be applied at a thickness such that the thickness of the adhesive layer after drying is 0.15 mm or more, and the drying process may be selectively performed after the coating process.

In addition, since the solvent contained in the adhesive after the application may damage the coating layer, it is preferable to perform drying under appropriate conditions. Specifically, since the adhesive layer has a relatively high content of solids relative to that of the polyurethane resin in the coating layer and the thickness of the adhesive layer is thinner than the coating layer, the adhesive layer can be performed at 60 to 180 ° C for 60 to 70 seconds, Or may be performed in two or more stages.

(Step 3)

Step 3 for fabricating the functional fabric according to one embodiment of the present invention is a step of fabricating the air resistance reducing functional fabric by positioning the base fabric on the adhesive layer prepared in Step 2 and then assembling the functional fabric.

The fusing process can be performed according to a conventional method, specifically, dLT can be performed by laminating the base fabric on the adhesive layer. However, when the force (tension) applied to the base fabric during the laminating process is large, the fabric is stretched, and when the film is coated in this state, the stress acts on the base fabric to unevenly damage the coated surface. Tension should be minimized. For this, it may be desirable to adjust the roller rpm to perform in an unarmed state.

The functional fabric according to one embodiment of the present invention manufactured by the above-described manufacturing process can greatly reduce the air resistance of the dimple pattern formed on the surface of the polyurethane coating layer, Can be minimized. In addition, the coating layer of the polyurethane resin on which the dimple pattern is formed can exhibit excellent mechanical properties in terms of tensile strength, elongation, etc., as well as bending resistance and minimized surface friction.

Specifically, the sportswear has the above-described functional fabric, particularly, the dimple pattern in the coating layer has a negative angle structure in the upper arm, the trunk, and the thigh, which are the regions requiring pressure for the posture maintenance and muscle support, more specifically, The number of dimples per inch (3 x 3 cm) may be 70 to 80, or 75 to 78.

Accordingly, according to another embodiment of the present invention, sportswear manufactured using the above-described functional fabric, particularly a speed sport field requiring speed improvement, more specifically, a speed skating suit is provided.

Hereinafter, the present invention will be described in more detail with reference to the following examples and experimental examples. However, the following Examples and Experimental Examples are provided for illustrating the present invention, and the scope of the present invention is not limited by these Examples and Experimental Examples.

Example 1. Preparation of air resistance-reducing functional coating fabric

(Preparation of base fabric)

# PM22 (SPAN 40D 29% POLYESTER 50/72 71%) was prepared as a base fabric.

(Preparation of Composition for Coating Layer Formation)

(DMF), methyl ethyl ketone (MEK), and toluene (TOL) as an organic solvent in an amount of 28 to 32% by weight of a polyurethane solid content (50:50 by weight of a mixture of 50% Was prepared as a polyurethane resin (NCO index 35).

10 g of the above polyurethane resin, 10 g of dimethylformamide (DMF), 10 g of methyl ethyl ketone (MEK), 30 g of toluene (TOL) and 12 g of toner (Wuxi Chem, KU NAVY 4010) were mixed and stirred to obtain a viscosity of 3,000 cps (25 占 폚). The physical properties of the polyurethane resin used in the composition for forming a coating layer are shown in Table 1 below.

(Preparation of composition for forming adhesive layer)

10 g of methyl ethyl ketone (MEK), 10 g of toluene (TOL), 12 g of a crosslinking agent (Hi-500 Nanjing Univ.) And 100 g of a catalyst (THE -30, Nanjing Univ.) Were mixed and stirred to prepare a composition for forming an adhesive layer having a viscosity of 2,000 cps (25 캜).

(Production of functional fabric)

The composition for forming a coating layer prepared above was first cast on a patterned mold (engraved 220L) so that a dimple-like pattern could be formed, and then dried at 60 DEG C for 4 minutes to form a first coating layer. Was cast on the first coating layer and dried at 60 DEG C for 4 minutes to form a second coating layer. The thicknesses of the formed first and second coating layers were 0.2 mm.

Then, the composition for forming an adhesive layer was coated on the coating layer in a dot pattern to have a thickness of 0.15 mm, and then the base fabric was positioned, followed by aging, followed by aging and drying to prepare an air resistance reducing functional fabric.

After that, the functional fabric was cut and sewed to produce a speed skating suit.

EXPERIMENTAL EXAMPLE 1. Evaluation of Flexibility of Functional Fabrics

The flexing performance of the functional fabric prepared in Example 1 was evaluated.

At this time, the flexural resistance was 100,000 times or 200,000 times according to ISO 7854: 1995 B, respectively. Cold resistance was evaluated according to KS K 0766: 2011. After completion of the test, the damage of the functional fabric in the coating layer was observed by an electron microscope.

In the flexural test, when the samples were treated 100,000 times or 200,000 times, the degree of damage was judged as 0 to 3 (0: no abnormality, 3: severe damage).

In addition, after the cold-proof test was carried out at -40 ± 2 ° C for 2 hours, all the observations showed no abnormality.

Examples 2-1 to 2-4 and 3-1 to 3-4. Manufacture of Functional Coating Fabric to Reduce Air Resistance

(Preparation of base fabric)

# PM22 (SPAN 40D 29% POLYESTER 50/72 71%) was prepared as a base fabric.

(Composition for forming coating layer)

A composition for forming a coating layer containing a filler was prepared in various contents in the same manner as in Example 1, except that the components and the contents shown in Table 2 were combined.

(Preparation of composition for forming adhesive layer)

A composition for forming an adhesive layer was prepared in the same manner as in Example 1 except that the components and the contents shown in Table 3 were used.

(Production of functional fabric)

The composition for forming a coating layer was cast on a patterned mold (engraved 220L) so as to form a dimple-like pattern using a Doctor-Coma Knife Coater at a coating amount of 140 g / m < 2 > After the thermal drying, second heat drying was performed at 120 캜 for 30 seconds, and then the third thermal drying was continuously performed at 160 캜 for 30 seconds to form a coating layer (thickness: 0.15 mm).

Thereafter, the composition for forming an adhesive layer was applied on the coating layer in a dot pattern to a thickness of 0.12 mm, dried for 1 minute, grounded, ground, aged and dried to prepare air resistance reducing functional fabric Respectively. After that, the functional fabric was cut and sewed to produce a speed skating suit.

Experimental Example 2. Evaluation of physical properties of functional fabric

2-1. Evaluation of moisture permeability

The contact angles of the functional fabrics prepared in Examples 2-1 to 2-4 were measured. The results are shown in Table 4 below.

As a result of measuring the contact angle of the coating layer containing the filler, it can be seen that the contact angle also increases as the filler content increases. Conversely, the surface energy decreased as the filler content increased. From these results, it can be seen that there is an optimal content range of the filler content. Particularly, considering the various properties such as the formability, smoothness and moisture permeability of the coating layer, the filler is contained in an amount of 1% Is more preferable.

2-2. Surface Smoothness Analysis

The smoothness of the coating layer in the functional fabric prepared in Examples 2-1 and 3-1 was analyzed using AFM. The results are shown in Table 5 below.

As a result, the surface state of the polyurethane coating layer containing 1 wt% of each of TiO 2 and SiO 2 fillers was generally good, and in particular, the coating layer containing the filler of TiO 2 formed a smoother surface Respectively.

2-3. Moisture permeability evaluation

Moisture vapor transmission rate (MVTR) was measured for the functional fabric prepared in Examples 2-1 to 2-4 and Examples 3-1 to 3-4, and the moisture permeability was evaluated from the results. The results are shown in Fig.

As a result, it was confirmed that the surface of the coating layer becomes rough and the moisture permeability decreases as the filler content increases.

2-4. Domestic water rating

The water resistance of the functional fabric prepared in Examples 2-1 to 2-4 and Examples 3-1 to 3-4 was measured, and the results are shown in Fig.

As a result, it can be seen that as the content of the filler increases, especially when the content is 5 wt% or more, the water resistance is significantly lowered. When the content of the filler exceeds 1% by weight, it is considered that the optimum content of the filler is 3% by weight or less, more specifically 1% by weight or less, considering that it also affects the physical properties including the formation of the coating layer.

2-5. Evaluation of moisture resistance and heat resistance

The moisture resistance and heat resistance of the functional fabrics prepared in Examples 2-1 and 3-1 were measured and the results are shown in Table 6 below.

As a result of the tests, the functional fabrics of Examples 2-1 and 3-1 including the inorganic filler showed excellent moisture resistance and heat resistance.

Example 4. Manufacture of functional coating material for reducing air resistance

(1) Selection of surface design

① Pattern shape: A new pattern was developed using the dimple effect of a golf ball to develop a pattern with a high air resistance reduction effect. In order to reduce frictional resistance of the air acting on the golf ball, a dimple was formed on the surface of the ball, It was made to reduce the resistance. Two patterns of embossing / embossing were developed on the release paper considering the dimple pattern of the golf ball.

② Size Depth: The cross-sectional size and shape of release paper was analyzed to analyze the pattern. The results are shown in Table 7 below.

(2) Manufacture of air resistance reducing functional fabric

(Preparation of base fabric)

# PM22 (SPAN 40D 29% POLYESTER 50/72 71%) and # 5072 FD (SPAN 40D 19% POLYESTER 45/24 FD 81%) were prepared as the base fabric, respectively.

(Preparation of Composition for Coating Layer Formation)

A polyurethane resin (NCO index 35) was prepared by mixing 40 wt% of a polyurethane solid content of 60 wt% (mixed weight ratio of 50:50 of SAMHOFASUNG 5015 resin and 5030 resin) and 40 wt% of methyl ethyl ketone (MEK) Respectively.

5 g of the above-mentioned polyurethane resin, 5 g of dimethylformamide (DMF), 5 g of methyl ethyl ketone (MEK), 25 g of toluene (TOL) and 6 g of toner (Wuxi Chem, KU NAVY 4010) were mixed and stirred to obtain a viscosity of 3,400 cps (25 占 폚).

The physical properties of the polyurethane resin used in the composition for forming the coating layer are shown in Table 8 below.

(Preparation of composition for forming adhesive layer)

5 g of methyl ethyl ketone (MEK), 5 g of toluene (TOL), 6 g of a crosslinking agent (Hi-500 Nanjing Univ.) And 5 g of a catalyst -30, Nanjing Univ.) Were mixed and stirred to prepare a composition for forming an adhesive layer having a viscosity of 2,500 cps (25 캜).

The physical properties of the polyurethane resin used in the composition for forming an adhesive layer are shown in Table 9 below.

(Production of functional fabric)

The composition for forming a coating layer prepared above was first cast on a patterned mold (embossing: 220RV, negative angle 220L) so as to form a dimple-like pattern, and dried at 60 ° C for 4 minutes to form a first coating layer, The composition for forming a coating layer was again cast onto the first coating layer and dried at 60 DEG C for 4 minutes to form a second coating layer. The thicknesses of the formed first and second coating layers were 0.2 mm.

Then, the composition for forming an adhesive layer was coated on the coating layer in a dot pattern to have a thickness of 0.15 mm, and then the base fabric was positioned, followed by aging, followed by aging and drying to prepare an air resistance reducing functional fabric.

After that, the functional fabric was cut and sewed to produce a speed skating suit.

Experimental Example 3. Analysis of physical properties of functional fabric

The functional fabric prepared above was subjected to a wind tunnel test, and the results are shown in Table 10 below.

As a result, the drag coefficient of the dimpled dimple structure of the mesh material was low.

Experimental Example 4. Determination of Air Resistance Coefficient Considering Application Condition of Fabric

(1) 3D scanning method

Through the preliminary experiments, we confirmed the possibility of forming dimples on the film surface from the two types of dimple structure circular patterns, and analyzed the dimensional characteristics of the dimple structure of the obtained prototype by the 3D scanning method, And predictable quantitative characteristics were obtained.

① Measurement purpose

- Three dimensional dimension data were obtained to perform the hydrodynamic simulation for the air resistance reduction pattern.

② Measurement method

- Phase-shifting 3D scanning using pattern light with high-precision 3D Scanner

③ Specification

- Scanning area (53mm × 41mm / 1 time), scanning time: 0.48sec / 1 time

Resolution: 42 탆 / 1.3 Mega Pixels (1280 횞 960)

- Mean error: 4.26 占 퐉 / height Accuracy: 4 占 퐉

The accuracy was verified using a gauge block, and the results are shown in Table 11 below.

④ Measurement sample

The samples were prepared by forming dimple patterns with engraved and embossed patterns, respectively.

3 is a photograph showing the surface of the air resistance reducing functional fabric according to an embodiment of the present invention (a) an engraved pattern, and b) a relief pattern).

(2) Simulation analysis and DB based on 3D scan file

Based on the files analyzed by the 3D scanning method, air resistance and detailed flow characteristics were simulated for the pattern of the film, and the size of each pattern was changed by 2 times and 0.5 times for the two dimple structure circular patterns. The most suitable pattern was found by comparing the air resistance against the branch case.

① Grid modeling

㉮ Fabric pattern shape

- For the simulation, a total of 6 cases were analyzed with 200% size and 50% size down for the two patterns with different shape. For comparison, 50mm width and 1mm thickness were standardized and analyzed. . The shape of the six fabric patterns is shown in Fig.

㉯ Surface grid

Figure 5 is a lattice of the fabric surface created for computational fluid analysis simulation. Approximately 1 million surface gratings were used, and the minimum length and the maximum length of the grating were 0.1 mm and 0.2 mm, respectively, for pattern representation. A small lattice is placed in the part where the curvature is sharp, so that the change of the fast flow characteristic can be captured in the simulation.

㉰ Space grid

- For the calculation of the flow characteristics around the simulation object, a 3D spatial grid should be generated for the surrounding space. The spatial lattice is divided into a boundary layer lattice for describing the viscosity adhered to the target wall surface and a free space lattice for describing the flow phenomenon in the boundary layer outer space.

* Boundary layer lattice

In order to describe the target wall boundary layer, a 12 layer 1.33 mm primer grid was used for the boundary layer as shown in FIG. This is the boundary layer thickness based on the Reynolds number of 5.1389e + 04 calculated considering the simulation condition, 15m / s forward speed. For the k-w turbulence model to obtain accurate results near the wall, the first lattice height is 0.025mm, corresponding to y + 1, and the total number of boundary layer lattices is 3.58 million.

* Remote space grid

7 is a space grid for calculating the space from the outer boundary of the fabric pattern to the far boundary of the computed domain. In order to capture the accurate wake, we used a lattice which is densely packed around the analytical target by 3 times in the backward direction of the fabric pattern length and 1 times in the forward direction, and about 50 million space gratings were used. 0.025mm, and the total number of boundary layer lattices is 3.58 million.

② Simulation setting

Figure 8 shows the simulation domain size. The domain of the fabric pattern length (L) 50mm, the front 10L, the rear 20L, the height 10L domain was used, and it is for the accurate air resistance coefficient calculation considering the size of the wake area. The width of the domain is given the same symmetry condition as the size of the object to be analyzed. The simulation conditions are as shown in Table 12 below.

③ Simulation result

The results of measurement of the air resistance coefficient for the same functional fabric as shown in FIG. 2 are shown in Table 13 below. The distribution of surface friction coefficient for each case is shown in Fig.

This simulation experiment is considered to be an incompressible flow with a relatively low flow velocity (15 m / s), and since the analytical colon has no angle of attack, there is almost no influence by lift, so the induced drag and the wave drag force can be ignored. Also, since the shape is relatively simple, the mutual interference between the wakes passing through the local part is neglected, so most of the drag generated in this simulation corresponds to the shape drag. The shape drag consists largely of the pressure drag caused by the pressure distribution around the object and the surface friction drag generated by the friction between the fluid and the wall at the boundary layer of the object surface. However, in this simulation, the difference between the fabric pattern and the pattern was the same, so there was no difference due to the pressure drag and the surface friction drag had the greatest influence. The turbulent intensity distributions and the velocity distributions for each case show that the values are high because the loss due to fluid kinetic energy dissipation is small and the friction drag is also small.

④ Simulation Conclusion

- Through the simulation test, air resistances were calculated for patterns of different size and shape, and by analyzing the characteristics, patterns with low resistance were confirmed.

- Most of the drag force generated in the dimple pattern is the shape drag and the surface friction drag according to the pattern difference is applied as the main drag force.

- When the size of the pattern is increased, the coefficient of air resistance decreases, and when it decreases, the coefficient of air resistance increases.

- Comparing the two patterns with different pattern shapes, the pattern of the golf ball dimple shape of Case 1 (engraved) showed lower values of air resistance coefficient.

- Case 2, in which the size of a pattern having a golf ball dimple shape was doubled, showed the lowest air resistance coefficient.

Experimental Example 5. Evaluation of Air Resistance Performance by Wind Tunnel Test

(1) Cylinder model experiment

In order to evaluate the air resistance of the speed skating suit, we investigated the multi - purpose wind tunnel equipment and the load cell to analyze the records of the speed skaters and then derive the appropriate wind speed. The specifications of the multi-purpose jointed wind tunnel are shown in Table 14 below. The maximum speed of the test section was 45 m / s and the average speed of the speed skaters was between 13 and 15 m / s.

This experiment was conducted in the form of a cylinder, and the fabric and material of the competition suit could be applied. Table 15 and Fig. 10 show measurement results of the fabric.

(2) Mannequin wearing experiment of competition suit

① Medium subsonic wind tunnel Outline: The medium subsonic wind tunnel is a single closed-circuit type wind tunnel. The size of the measurement part is 3.7m wide, 2.45m high, 8.7m long and removes the boundary layer which can remove the boundary layer at the bottom of the test part. Device (boundary layer removal system), so that the experiment can be performed close to actual flight environment. The shrinkage ratio of the wind tunnel test section is 7.26: 1 and the maximum flow velocity of the wind tunnel test section is 92 m / sec. Speed control is possible up to ± 0.03 m / sec. The speed steadiness is ± 0.11% of the average flow rate, which can maintain a very stable experimental flow rate. The maximum number of revolutions of the blower is 365 RPM and requires 2,100 kW of power. The turbulence level in the wind tunnel test was within 0.1% at 74 m / sec.

Detailed Test Facility and Specification: Table 16 below shows the details of the wind tunnel of the medium subsonic wind tunnel and the condition of the attached equipment, and Table 17 shows the oil quality characteristic (reference velocity: 74 m / sec) of the first measurement part of the medium subsonic wind tunnel . The measuring instrument has an external balance to measure the aerodynamic force and moment acting on the aircraft airframe, three built-in balances, and a PSI 8400 measuring instrument for measuring pressure. There is also equipment that can perform flow visualization such as a smoke generator.

The measuring part is interchangeable, and the second test part is additionally secured. In the case of the second test part, a model of the same kind as the automobile can be manufactured by 1: 1 test. The test field includes basic aerodynamic measurement, surface pressure measurement on the surface of the model, flow field pressure measurement using a probe moving system (Probe Traverse System), visualization test, qualitative test, Experimental field can be performed.

(3) Measurement of drag coefficient: The drag force is measured repeatedly three times at a flow rate of 15 m / s for each sample to obtain an average value. Each measurement measures 100 data per second for 20 seconds to collect 2,000 data, and the average value is used as the measurement value of the difference. The measured drag is converted to the drag coefficient by the following equation based on the flow rate at the time of measurement.

Where D is the measured drag, ρ is the air density, V is the flow velocity, and S is the cross sectional area of 0.322956 m.

④ Flow Visualization: Flow visualization can be performed to examine the flow characteristics of body parts. Flow visualization was performed using a moke generator, and visualization was performed on the head, shoulders, arms, and legs, respectively. Based on the flow characteristics shown through the flow visualization, it can be helpful to select and combine the fiber materials of each part to reduce the drag.

As a result, it was found that functional garment having the above engraved pattern (including about 75 dimples per a standard area (3 x 3 cm)) was formed in the upper arm, the trunk, and the thigh, The air resistance reduction effect was observed.

Claims (23)

Base fabric;
A coating layer located on one side of the base fabric and comprising a first polyurethane resin; And
An adhesive layer disposed between the base fabric and the film layer and including a second polyurethane resin adhesive,
Wherein the coating layer has a dimple pattern,
Wherein the first polyurethane resin has a polyurethane resin solid content of 28 to 32 wt% and a viscosity at 25 DEG C of 60,000 to 90,000 cps,
Wherein the second polyurethane resin has a solids content of 58 to 62 wt% and a viscosity at 25 DEG C of 60,000 to 80,000 cps. The method according to claim 1,
Wherein the dimple pattern is at least one of a relief and an engraved. delete The method according to claim 1,
The dimple pattern is formed in a spacial space lattice structure spaced apart from the dimple pattern length by a distance of 0.8 to 1 times at the distal end of the functional fabric and at a distance of 2 to 3 times at the rear end thereof. Air resistance reduction functional fabric that increases distance. The method according to claim 1,
Wherein the dimple pattern comprises two or more dimples having a single size or having different sizes within a range of 0.1 mm to 50 mm in average diameter. The method according to claim 1,
The dimple pattern may include a first dimple having an average diameter of 0.1 mm to 3.0 mm; A second dimple of greater than 3.0 mm but less than 3.5 mm; And a third dimple of greater than 3.5 mm but less than 5.0 mm. The method according to claim 1,
Wherein the coating layer comprises 70 to 80 dimpled dimples per 3 x 3 cm of the reference surface area. The method according to claim 1,
Wherein the coating layer has a thickness of 0.15 mm to 40 占 퐉. delete The method according to claim 1,
Wherein the first polyurethane resin has an NCO index of 30 to 50. The air resistance reducing functional fabric of claim 1, The method according to claim 1,
Wherein the coating layer further comprises a filler in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the first polyurethane resin. 12. The method of claim 11,
Wherein the filler comprises at least one of TiO2 and SiO2. The method according to claim 1,
Wherein the adhesive layer is patterned in the form of dots. The method according to claim 1,
Wherein the base fabric is a fabric or knitted fabric woven using 10 to 30 wt% spand and 70 to 90 wt% polyester. The method according to claim 1,
Wherein the base fabric comprises 10 to 30 wt% span of 30 to 50 denier; And 70 to 90% by weight of 40 to 50 denier / 20 to 80 filaments of polyester. Applying and drying a film layer forming composition comprising a first polyurethane resin and a first organic solvent on a dimple pattern forming mold to form a coating layer;
Applying an adhesive layer forming composition comprising a second polyurethane resin, a crosslinking agent, a catalyst and a second organic solvent on the coating layer to form an adhesive layer; And
Placing the base fabric on the adhesive layer,
The method according to claim 1, wherein the air resistance reducing functional fabric is made of a synthetic resin. 17. The method of claim 16,
Wherein the first and second organic solvents each independently include any one or a mixture of two or more selected from the group consisting of a ketone-based organic solvent, an ether-based organic solvent, and petroleum ether. delete 17. The method of claim 16,
Wherein the formation of the coating layer is carried out by applying the casting composition of the composition for forming a coating layer and then performing the drying process twice. 17. The method of claim 16,
Wherein the drying step comprises: a primary drying at a drying temperature of 60 ° C or more and less than 90 ° C for a drying time of 30 seconds to 5 minutes; Secondary drying at a temperature of from 90 ° C to 110 ° C for 30 seconds to 120 seconds; And a third drying step at a drying temperature of 110 to 180 DEG C for 30 to 120 seconds. 15. Sportswear made using the air resistance reducing functional fabric according to any one of claims 1, 2, 4 to 8, and 10 to 15. A speed skating suit manufactured using the air resistance reducing functional fabric according to any one of claims 1, 2, 4 to 8, and 10 to 15. 23. The method of claim 22,
Wherein the speed skating suit comprises functional fabric in the upper arm, torso and thigh.

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