KR100896796B1 - Self control type heat insulation fabric - Google Patents

Abstract

The present invention is a heat insulating fabric, a pile or concave-convex structure on the surface in contact with the skin, the back layer formed of hydrophobic fibers or hydrophobic fibers and hydrophilic fibers and a fiber that can expand and swell when absorbing moisture on the back layer It is formed of an absorbent heat generating layer coated with an acrylic resin crosslinked only on the surface layer and the lower portion of the surface layer or the lower portion of the surface layer and the back layer, wherein the surface layer is formed of a denser structure of the tissue than the back layer. Provide insulation fabric.

Sweat-absorbent quick-dry, thermal insulation, self-control

Description

Self Controlling Insulation Fabric {SELF CONTROL TYPE HEAT INSULATION FABRIC}

The present invention relates to a fabric having a self-regulating thermal insulation function, and more particularly, to a fabric that can utilize the metabolic action of the human body as a basic mechanism of thermal insulation.

There are many factors to be considered in considering the heat insulation of the coating, but the thermal conductivity of the fiber itself and the content of the fabric constituting the coating is the biggest consideration.

The concept of thermal insulation can be divided into a passive method of preventing the heat emitted from the human body from being lost to the outside and an active concept of actively applying heat from the outside. The former method is used to insulate the heat generated from the human body by the air layer of the fabric, and to use a far-infrared reflective material that does not radiate radiant heat emitted from the human body to the outside of the clothing. A method of using has been proposed, and the latter method has been proposed of introducing an electric heating material, a chemical reaction heating heat insulating material, and a solar thermal storage heat insulating material to the coating.

Among the former methods, the thermal insulation insulation method by the air layer is the reason for increasing the thickness of the fabric constituting the coating, causing the activity to be lowered, and the use of other materials is a factor that reduces the washability and durability of the coating. It is difficult to use universally.

On the other hand, the thermal conductivity is a constant relating to the material indicating the degree of heat transfer is also called thermal conductivity. It refers to the ratio of the amount of heat passing in the unit time perpendicularly to the unit area of the isothermal surface at any point inside the object and the temperature gradient in this direction. In other words, it is a constant for a material that indicates the degree of heat transfer, which depends on the temperature and pressure. In the case of an isotropic substance, it is a scalar amount, and in the case of an anisotropic substance, it is a tensor amount. In particular, metal has a large value due to thermal conduction by free electrons, and the Biedmann-Franz law holds between thermal conductivity and electrical conductivity. Thermal conductivity is affected by density, specific heat and viscosity. For example, cloth with high thermal conductivity flax fiber is a cool fiber, wool with a low thermal conductivity is the warmest fiber.

In Korean Patent Laid-Open No. 1991-3210, a method of manufacturing a coated fabric having excellent thermal insulation by far-infrared radiation characteristics was proposed. Specifically, a polyurethane solution having a solid content of 30 ± 1% using dimethyl formamide as a solvent on one side of a synthetic fiber fabric and Particles having far-infrared radiation characteristics obtained by sintering and pulverizing 20-80% microcline, 5-30% beryllium oxide, 5-20% zinc oxide, and 5-15% tin dioxide, and zeolite It relates to a method for producing a coated fabric in which a coating film is formed from the mixture consisting of A). The method has a problem in washability and durability since the coating layer is formed on the fabric as mentioned above.

In addition, WO2002 / 34988 discloses a fabric made of a conductive yarn for generating heat from a power source, and includes at least one non-conductive yarn and at least one amount of temperature coefficient (PTC) heating yarn, and the non-conductive yarn and PTC heating yarn are combined. There has been proposed a structure for forming a heating fabric. This proposal also requires a structure for generating a separate power source, and there is a problem such as poor coating suitability.

Meanwhile, in Korean Utility Model Publication No. 200227811, in a fabric in which warp yarns and weft yarns, which are spun yarns or multifilament yarns, cross each other, silver plated yarns having silver plating on polyamide fibers are arranged at regular intervals in both diagonal directions or weft yarn directions. It is proposed a multi-functional fabric characterized in that. The fabric is characterized in that the silver plated yarn is arranged in a direction inclined or weft uniformly has excellent antistatic effect and heat insulation or heat insulation effect, but the silver plated yarn and the silver plated yarn is expected to be expected due to the presence of silver plated yarns arranged at regular intervals in the fabric. It is difficult to express heat insulation or heat insulation due to the common yarn without a difference in the number of thermal conductivity of the more coming together. Moreover, the fact that most of the silver-plated yarns are made of low thermally conductive fibers, in addition to the portion where the silver plated yarns are disposed, is doubtful of whether thermal insulation can be realized due to the difference in thermal conductivity of a part of the same layer of fabric.

Therefore, the conventional concept of thermal insulation depends only on the condition of the fabric or cloth, and there is no consideration of the mechanism with the metabolism of the human body wearing it at all.

In order to solve the above problems, an object of the present invention is to provide a thermal insulation fabric that can implement a thermal insulation mechanism that can communicate with the metabolism of the fabric and the human body wearing the same.

In addition, an object of the present invention is to provide a thermal insulation fabric that can be realized as a realization principle of the heat or sweat generated in the human body.

In addition, an object of the present invention is to provide a thermal insulation fabric that can provide comfort to the human body wearing a coating made of the fabric while expressing a thermal insulation function by utilizing moisture generated in the human body.

In order to achieve the above object, the present invention is a thermal insulation fabric, pile or uneven structure on the surface in contact with the skin, the back layer formed of hydrophobic fibers or hydrophobic fibers and hydrophilic fibers and the upper surface of the back layer, upon expansion of water absorption And an absorbent heat-generating layer coated with a crosslinked acrylic resin only at the bottom of the surface layer and at the bottom of the surface layer and at the bottom of the surface layer and the back layer, wherein the surface layer has a higher density of tissue than the back layer. It provides a self-regulating thermal insulation fabric formed of a dense structure.

In another aspect, the present invention is a heat insulating layer that can prevent the decrease in body temperature due to the heat of vaporization by mixing the photo-selective absorbing ceramic particles on the top of the surface layer with an adhesive or dispersant and additionally applied to the fabric by a method such as binding, coating or laminating Provide more formed fabric.

In another aspect, the present invention provides a fabric selected from the group consisting of polypropylene-based DTY, the hydrophobic fibers forming the back layer, a hydrophilic fiber is a polyamide-based, natural fibers such as cotton fibers, acrylic fibers.

The present invention also provides a fabric in which the fibers constituting the surface layer have an axial expansion rate of 5 ± 2.5%.

In another aspect, the present invention provides a fabric having a volume swelling ratio of 110 to 135% of the fibers constituting the surface layer.

The present invention also provides a fabric in which the surface layer is formed 1.1 to 5 times more densely than the back layer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms 'about', 'substantially', and the like, are used at, or in close proximity to, numerical values when manufacturing and material tolerances inherent in the stated meanings are set forth, and an understanding of the present invention may occur. Accurate or absolute figures are used to assist in the prevention of unfair use by unscrupulous infringers.

As used herein, the term 'fabric' is used to mean all articles, nonwoven fabrics and fibrous webs produced by weaving or knitting.

1 is a back layer 200 in contact with the skin 100 to the structure of the fabric according to an embodiment of the present invention may be formed of a pile or uneven structure. The upper surface layer 300 may be formed on the upper surface layer 300, and the absorption layer 400 may be formed between the rear surface layer 200 and the surface layer 300.

The back layer 200 may be formed in a pile or concave-convex structure so as to have a small area in contact with the skin. The back layer 200 may be made of polyethylene-based fibers, preferably polypropylene, but is not limited thereto, and may be applied to hydrophobic fibers.

As another embodiment, the hydrophobic fiber and the hydrophilic fiber may be mixed, for example, the polyolefin fiber and the polyamide fiber may be mixed. Here, the hydrophobic fibers form a basic concave-convex structure, and the hydrophilic fibers may double the sweat-absorbing quick-drying function by performing a function as a binder with the surface layer 300 to be described later. The hydrophilic fibers may be applied as long as they are relatively hydrophilic fibers rather than hydrophobic fibers (for example, polyolefin-based fibers), and may be selected from one or more selected from the group consisting of polyamide-based, natural fibers such as cotton fibers, and acrylic fibers. Can be.

The surface layer 300 may have a structure in which the tissue becomes tighter when water is absorbed. To this end, the surface layer 300 may be formed using an absorbent stretch elastic yarn. As a result, when the elastic yarn is stretched in the direction of the weft yarn when the moisture is absorbed or absorbed, the density of the surface layer 300 may increase. In addition, all fibers have a default swelling property, and in particular for rayon it is possible to take advantage of properties that exhibit a volume swelling of less than 130%.

In addition, a copolymer may be used as the absorbent stretch elastic yarn. For example, the soft segment may be made of polyoxyethylene glycol and the hard segment may be a polyether ester copolymer made of polybutylene terephthalate. Here, the fiber formed of the polyether ester copolymer is mainly intended to expand, and thus, the surface layer 300 of the present invention may simultaneously pursue expansion and swelling of the fiber. Figure 4 shows the morphology of the tissue.

The absorbent stretch elastic yarn constituting the surface layer is preferably in the case of an axial expansion rate of 5 ± 2.5% and / or a volume swelling ratio of 110 to 135%. If the range is less than the change in the density of the tissue is weak because the expression of the warm function, if the above range is because the problem of morphological stability of the tissue may occur.

Basically, the density of the tissue of the surface layer 300 is preferably formed in a denser structure than the density of the back layer 200 regardless of the expansion or swelling of the constituent fibers. In this case, the density ratio may be designed to be 1.1 to 5 times denser than that of the back layer 200 in the density of the surface layer 300. If the difference in density is less than 1.1, the effect of water distribution from the back layer to the surface layer is lowered, and if it exceeds 5 times, there is a problem in that the morphological stability and productivity of the tissue are lowered.

Meanwhile, the absorption heat generating layer 400 is formed between the back layer 200 and the surface layer 300, that is, is formed under the surface layer 300. The absorption heat generating layer 400 may be applied as long as the material exhibits a heat generating function at the time of moisture absorption or absorption and sorption. Basically, the hygroscopic mechanism of the fiber is an exothermic reaction, and it can be said that all fibers can play the role of the absorption heat generating layer. However, the consideration here is that the heat retaining function as a heat insulating fabric should be maintained. It is known that the temperature rises up to the time period when the fibers reach a temporary equilibrium. However, thereafter, even if the moisture content is increased, the temperature is lowered. Especially when applied to the coating, the temperature drop felt by the wearer is further amplified by the latent heat of evaporation. Therefore, the inclusion of a material capable of exothermic upon moisture absorption in the fabric may be a separate problem from the hygroscopic mechanism of the fiber.

To this end, the crosslinked acrylic resin may be applied or laminated. Here, the acrylic resin is preferably 50% by weight or more of acrylonitrile.

On the other hand, Figure 2 shows another embodiment according to the present invention, the absorption heat generating layer 400 may be formed by applying to all parts in contact with the skin surface as shown in FIG. In this case, the absorption heat generating layer 400, the back layer 200, and the surface layer 300 may be sequentially stacked from the skin 100.

Figure 3 shows yet another embodiment according to the present invention by mixing the solar selective absorbing ceramic particles in the surface layer 300, such as adhesives or dispersants, and additionally applied to the fabric by a method such as binding, coating and laminating to the heat of vaporization A heat absorbing layer 500 may be further formed to prevent a decrease in body temperature. The ceramic particles may be zirconium carbide (ZrC).

Hereinafter will be described the sweat-absorbing quick-drying and warmth mechanism of the fabric according to the present invention.

When moisture such as sweat (hereinafter referred to as 'moisture') occurs in the human body during exercise or life, the moisture is not absorbed by the hydrophobic back layer 200 and is absorbed by the surface layer 300. Since the back layer 200 is hydrophobic, moisture is concentrated and absorbed on the surface layer 300, and at the same time, the back layer 200 is in contact with the skin, thus maintaining a continuous feeling of dryness and comfort in the human body. On the other hand, physical backing of water is formed in the backing layer 200 because the backing layer may be absorbed into the physical space between tissues even though the backing layer is composed of hydrophobic fibers. Moisture absorbed by the back layer 200 is quickly moved to a more densely formed surface layer 300. This is because a capillary phenomenon is expressed between the surface layer and the back layer.

Since the height of the capillary tube is realized by the following equation, the diameter of the capillary tube decreases from the back layer to the surface layer, and thus the rising height of the capillary tube increases, so that the transition speed (rising speed) also increases.

Where H is the height of capillary rise

σ: surface tension (kg / m)

β: contact angle

γ: Specific weight per unit volume (kg / l)

d: diameter of the capillary

Sweat-absorbing quick-drying may mean that the clothing (fabric or knitted fabric) that wears moisture such as sweat or water vapor generated in the human body quickly absorbs and removes it. However, the principle of the sweat-absorbent quick-drying proposed by the present invention will be different from the meaning of the rapid removal of moisture absorbed by the fabric and the like.

The former means the presence of moisture in the fabric, the amount of drying, and the microporous structure of the fiber may be proposed as a structure for this purpose, but in the latter meaning of the present invention, it retains in contact with the skin rather than the absolute amount of moisture. In the face of contact with the skin by quickly moving the moisture to the outside (diffusion to other layers or surroundings), it means that there is no presence of water and the amount of water present is considerably reduced.

Under the assumption that the amount of moisture contained in the fabric is the same, the skin can feel dry and refreshed if the retained moisture can be rapidly diffused into other layers. Then, regardless of the absolute evaporation or dryness of moisture Physical properties can be implemented.

The surface layer 300 including the moisture rapidly transferred from the back layer 200 expands in the longitudinal direction and the fiber itself swells to increase the density of the tissue, which in turn causes the water from the back layer 200 to the surface layer 300. The surface layer 300 expanded and / or swollen into tighter tissues further accelerates the transition and acts like a greenhouse to prevent the body temperature from dropping.

On the other hand, after the moisture is dried to some extent, the surface layer 300 is restored to the state of the original tissue.

As another embodiment of the present invention, when using a hydrophilic fiber in the back layer 200 together with a hydrophobic fiber and the hydrophilic fiber as a binder, the hydrophilic fiber serves as another drain hole to the surface layer 300 It can increase the moisture transfer rate. This is because chemical moisture adsorption is possible along with the physical drainage structure (capillary phenomenon). Even when water adsorption occurs and persists in the back layer, a very small amount of the hydrophilic fiber is used as the binder, and thus a continuous feeling of dryness may be formed on the skin in contact with the back layer.

The absorption heat generating layer 400 absorbs moisture generated from the skin and exothermic phenomenon is generated by a chemical mechanism. This will strengthen the warming function.

In the heat insulation mechanism of the fabric according to an embodiment of the present invention, the moisture generated from the skin becomes one-way water transfer from the back layer to the surface layer, and the transferred moisture is exothermic by the absorption heat generating layer, and the surface layer is transferred to the moisture. As the swelling / swelling changes into denser tissue, surface densification proceeds, thus preserving the exothermic temperature and body temperature. In addition, since the moisture is already rapidly moved to the surface layer, the skin is dried and comfortable while preventing the temperature drop due to the heat of vaporization of the moisture. In this case, the heat retaining function is further doubled by the heat absorbing layer further formed on the surface layer.

As described above, the self-regulating thermal insulation fabric according to the embodiment of the present invention has an effect of rapidly removing moisture generated in the human body and improving comfort and dryness, but rather improving thermal insulation using such moisture.

In addition, while minimizing the area of the layer in contact with the skin surface and giving the skin a one-way water transition from the back layer to the surface layer, there is an effect of increasing heat retention and heat generation of the absorption heat generating layer by increasing the surface layer density.

This makes it possible to create applications that are very suitable for sports clothing and mountaineering.

Example  One

The back layer is made of polypropylene DTY and nylon 66 is used as a binder, and the surface layer is a polyetherester-based fiber, and 50 parts by weight of polyoxyethylene glycol is a soft segment: a copolymer is formed of 50 parts by weight of polybutylene terephthalate. It was used as the spinning. Herein, the texture of the surface layer was twice as thick as that of the back layer. The heat absorbing layer was cross-linked as an acrylic resin and a spot padding method was applied to the surface layer only to increase the nitrile group by 5% (evaluated by nitrogen increase).

Example  2

The same as in Example 1, the ceramic particles on top of the surface layer was coated with a polyurethane resin (moisture-permeable waterproof resin) containing 5.7% by weight of zirconium carbide (ZrC).

Comparative example  One

Same as Example 1, but the same tissue density was woven.

Comparative example  2

Same as Example 1, but the surface layer was formed of nylon 66.

* Quick drying test

division Absorption length mm / 10 minutes 100% moisture transition time of back layer (minutes) Inclination Weft direction Example 1 163 168 1 or less Example 2 165 167 1 or less Comparative Example 1 127 125 54 Comparative Example 2 161 165 1 or less

The absorption function, drying function, and water transfer rate of the fibrous sheet according to the present invention were evaluated in the following manner.

Absorption rate (mm / 10 minutes)

It was measured by KSK08l5, 6.27.1B method. Take at least five specimens of 20 x 2.5 cm in the wale and course directions, and stop each specimen with a horizontal bar at a constant height, with one end touching the surface of the container containing distilled water at 27 6 2 ° C. After 10 minutes, the height (mm) of rising water by capillary phenomenon is measured and expressed as the average value.

· Back drying speed (minutes)

Measured by visual discrimination method. In a standard state, 10 g of water is poured into the back layer of the sample having a size of 15 X 15 cm, and the time until the back layer is completely dried is measured.

Moisture Transfer Rate (min)

Measured by visual discrimination method. 10 g of water was poured into the back layer of the sample having a size of 15 X 15 cm in the standard state, and the water transferred from the back layer to the surface layer after 1 minute was converted into the following formula.

* Temperature change

The distance between the catheter and the light source is 30cm. In addition, wearing the clothes of Example 1 and Comparative Example 2 in the upper body of the human body, the change in temperature was observed after 15 minutes of walking exercise and 5 (3) minutes of exercise before wearing (Fig. 4).

Before and after temperature difference    Survey time sample 0 One 2 3 4 5 5 (highest temperature) Comparative Example 2 0.1 5.2 9.8 12.2 14.8 15.8 I'm 41.6 after 25.8 Example 1 0.1 5.1 9.6 12.7 15.3 17.5 I'm 13.8 after 26.3

Temperature change of Example 1 division 18 ° C., 29% R.H. face Back right left side right left side Before wearing Average 31.5 34.0 30.5 30.0 Best 30.8 33.2 33.5 33.3 Right after exercise Average 31.0 (-0.5) 30.1 (-3.9) 29.7 (-0.8) 29.3 (-0.7) Best 34.0 (+3.2) 32.7 (-0.5) 33.2 (-0.3) 32.7 (-0.6) 3 minutes later Average 30.3 (-1.2) 29.6 (-4.4) 29.1 (-1.4) 28.7 (-1.3) Best 33.1 (+2.3) 32.3 (-0.9) 32.2 (-1.3) 32.0 (-1.3)

* Testimonials

Emotional test results for comfort and body temperature maintenance after fabricating the fabrics produced in Examples and Comparative Examples as T-shirts for 50 men and women between 10 and 50 years of age during outdoor exercise (outdoor temperature 15 degrees) Indicates.

unit : % division Very effective Effective Little effect no effect Comparative Example 2 (Comfort) 11 35 34 20 Comparative Example 2 (temperature retention) 10 12 21 57 Example 1 (comfort) 28 34 30 8 Example 1 (temperature retention) 24 36 20 20

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

1 is a cross-sectional view of the insulating fabric according to an embodiment of the present invention.

Figure 2 is a cross-sectional view of the insulating fabric according to another embodiment of the present invention.

Figure 3a and 3b is a cross-sectional view of the insulating fabric according to another embodiment of the present invention.

Figure 4 is a conceptual diagram of the water absorption of the surface layer according to an embodiment of the present invention.

Figure 5 is a conceptual diagram of measuring the change in body temperature when wearing the thermal insulation fabric according to an embodiment of the present invention.

<Description of Major Symbols in Drawing>

100: skin layer 200: back layer

300: surface layer 400: absorption heat generating layer

500: heat absorption layer

Claims (6)

In the heat insulating fabric, A backing layer formed of a hydrophobic fiber or hydrophobic fiber and a hydrophilic fiber that is more hydrophilic than the hydrophobic fiber, with a pile or uneven structure on the surface contacting the skin; A surface layer made of a fiber formed of a rayon or polyether ester copolymer capable of expanding and swelling upon absorption of moisture on the back layer; In order to express a heat generating function when absorbing moisture, only the lower portion of the surface layer or the lower portion of the surface layer and the back layer is formed of an absorption heat generating layer coated with acrylic resin crosslinked, The surface layer is a self-regulating thermal insulation fabric, characterized in that the structure of the tissue is denser than the back layer. The method of claim 1, The insulating layer is further formed on top of the surface layer by mixing the solar selective absorbing ceramic particles with an adhesive or a dispersant, and then additionally coating the fabric by a method such as binding, coating, or laminating to form a thermal insulation layer that can prevent the temperature decrease due to heat of vaporization. Self-regulating insulation fabric The method of claim 1, The hydrophobic fiber forming the back layer is polypropylene-based DTY, the hydrophilic fiber is characterized in that at least one selected from the group consisting of polyamide-based, natural fibers such as cotton fibers, acrylic fibers more hydrophilic than the polypropylene-based DTY Self-regulating insulation fabric. The method of claim 1, Fiber constituting the surface layer is a self-regulating thermal insulation fabric, characterized in that the axial expansion rate of 5 ± 2.5%. The method of claim 1, Fiber constituting the surface layer is a self-regulating thermal insulation fabric, characterized in that the volume swelling ratio of 110 to 135%. The method of claim 1, The surface layer is a self-regulating thermal insulation fabric, characterized in that formed 1.1 to 5 times denser than the back layer.

Images