KR100991531B1 - Method for fabricating heating fabric - Google Patents

Abstract

The present invention provides a method for producing a heating fabric, comprising: forming a conductive layer on top of a base layer made of synthetic fibers, regenerated fibers or natural fibers; Forming a heat generating layer such that a part or all of the conductive layer is in contact with the conductive layer on the top, the bottom, or the same plane of the conductive layer; And forming an insulating layer on top of the conductive layer and the heat generating layer for electrical shielding, smoothing the surface of the base layer, offsetting the voids of the base layer, and complementing the base layer of the base layer to compensate for the bend resistance. It provides a method for producing a heating fabric, characterized in that it further comprises a calendering step of pressing with a compression roller.

Smart clothing, fever, electronics, circuit

Description

Manufacturing method of exothermic fabric {METHOD FOR FABRICATING HEATING FABRIC}

The present invention relates to an electrically conductive fabric, and more particularly to a method for producing a heating fabric.

Smart Wear is a new product designed to use digital functions anytime and anywhere by applying new signal transmission fiber technology and embedding various digital devices in textile fashion products. In other words, it is a new type of clothing that is equipped with digital functions necessary for maintaining the properties of textiles or clothing in textile materials and clothing. For this reason, it must transmit digital signals while showing the feel and properties similar to that of ordinary fabrics. Thus, a new concept of clothing that combines the functionality of the materials (Hifunction materials properties) that the fibers or clothing itself senses external stimuli and responds to itself and the digitalized properties that the clothing and the fabric itself do not have.

Smart Wear, which has been developed for military use in the United States and Europe since the mid-1990s, is currently being actively developed in clothing and medical fields.

In particular, smart materials using printing electronic technology may be used in various military textile products of a wearable computer.

When printed electronic technology is used as an interconnection method for connecting conductive fibers, fabrics, and various parts that have clothing and electrical properties in smart materials, the application value is high because fabric-based electronic circuit design is possible. .

For example, if printed electronics are applied to military uniforms, there is a possibility of weight reduction and volume reduction, thereby enabling the development of military uniforms integrating the healing function and communication function. In modern warfare-oriented warfare, soldiers must carry more than 45kg of equipment when fully armed, so the development of this technology is urgently required.

Recently, the heating element researched for manufacturing smart wear has a function of automatically generating heat by measuring external environment and body temperature such as temperature, humidity, and ultraviolet light. However, there is an increasing demand for a more comfortable fit and durability to avoid problems in washing.

Therefore, it is required to develop flexible printed fabric circuit board (FPFCB) technology and product development through the development and application of electrically conductive materials.

In other words, as a fabric development technology capable of data transmission by printing an electrically conductive material on the fabric, the development of durable electrically conductive material, the development of technology capable of printing a conductive material on the fabric, the development of fabric-based circuit construction technology, the printed conductivity There is a need to develop post-processing techniques to maintain and improve the performance of materials.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a heating fabric capable of forming a heating portion by forming a circuit on a fabric without limiting dynamic wearability and a method of manufacturing the same.

It is also an object of the present invention to provide a heat generating fabric and a method of manufacturing the same, while improving power generation while reducing power consumption.

It is also an object of the present invention to provide a heat generating fabric and a method of manufacturing the same, which are free from product defects or circuit breakage due to disconnection.

It is also an object of the present invention to provide a heat generating fabric and a method of manufacturing the same that can satisfy both the electrical properties and the inherent properties of the fabric that can be used in clothing.

It is also an object of the present invention to provide a heat generating fabric and a method of manufacturing the same so that a smooth current can flow by modifying the shape of the bending point of the circuit in the circuit design of the heat generating fabric.

It is also an object of the present invention to provide a heat generating fabric having high wear strength and high flex resistance and a method of manufacturing the same by changing the printing order of the heat generating layer and the conductive layer.

It is also an object of the present invention to provide an exothermic fabric having a washing resistance for improving insulation and expressing durability by changing the insulating layer coating composition on one or both surfaces of the exothermic fabric and its manufacturing method.

In order to achieve the above object, the present invention provides a method for producing a heating fabric, comprising: forming a conductive layer on top of a base layer made of synthetic fibers, regenerated fibers or natural fibers; Forming a heat generating layer such that a part or all of the conductive layer is in contact with the conductive layer on the top, the bottom, or the same plane of the conductive layer; And forming an insulating layer on top of the conductive layer and the heat generating layer for electrical shielding, smoothing the surface of the base layer, offsetting the voids of the base layer, and complementing the base layer of the base layer to compensate for the bend resistance. It provides a method for producing a heating fabric, characterized in that it further comprises a calendering step of pressing with a compression roller.

In addition, the heating layer or the conductive layer is applied to provide a method for producing a heating fabric, characterized in that at least one selected from the group consisting of coating, printing and transfer printing.

In addition, the heat generating layer or conductive layer provides a method for producing a heat generating fabric, characterized in that the conductive material or a conductive material and a binder is formed.

In addition, the conductive material is a conductive polymer, carbon (carbon), silver (silver), gold, platinum, palladium, copper, aluminum, tin, iron and nickel, at least one selected from the group consisting of the production of exothermic fabric Provide a method.

In addition, the binder provides a method for producing a heating material, characterized in that at least one selected from the group consisting of polyurethane resin, acrylic resin, silicone resin, melamine resin and epoxy resin.

In addition, the binder provides a method for producing a exothermic fabric, characterized in that the water-dispersible polyurethane.

In addition, the conductive polymer provides a method for producing a heating element, characterized in that at least one selected from the group consisting of polyaniline, polypyrrole, polythiophene.

In addition, the conductive material and the binder forming the conductive layer provides a method for producing a heating element, characterized in that included in the content ratio of 90:10 to 80:20 by weight.

In addition, the conductive layer provides a method for producing a heating element, characterized in that in contact with the heating layer at two or more points.

In addition, the thickness of the heat generating layer or conductive layer provides a method for producing a heat generating fabric, characterized in that 2 to 500㎛.

In addition, the width of the conductive layer provides a method for producing a heating fabric, characterized in that 10 to 20mm.

In addition, the insulating layer is formed by coating, printing, or laminating at least one selected from the group consisting of polyurethane resin, acrylic resin, silicone resin, polyester resin, PVC resin, and polytetrafluoroethylene (PTFE) resin. It provides a method for producing a heat generating fabric, characterized in that.

In addition, the insulating layer provides a method of manufacturing a heating fabric, characterized in that the dry coating in the case of direct coating, hot melt type dot or gravure method in the case of laminating.

In addition, the resistance value of the fabric provides a method for producing a heating fabric, characterized in that before and after washing 0.5 to 4Ω.

Hereinafter, preferred 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.

The terms "about "," substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation of, or approximation to, the numerical values of manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

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

1 to 3 shows a cross-sectional view of the fabric according to an embodiment of the present invention.

1 to 3, the heating fabric 10 according to the present invention may be composed of a base layer 100, an optional primer layer 200, a heating layer 300, a conductive layer 400, and an insulating layer 500. Can be.

In the fabric according to the preferred embodiment of the present invention, the base layer 100 may be any type of woven fabric, knitted fabric, nonwoven fabric or fibrous web. It can be applied without limitation to the material and the forming method. For example, it may be made of synthetic fibers such as polyester / polyamide / polyurethane, cellulose regenerated fibers such as rayon / acetate, and natural fibers such as cotton / wool /.

The base layer 100 is microscopically very uneven in its surface, and there are extremely many fine pores due to the gap between the fibers. Therefore, to ensure the uniformity of the surface and to be described later to the heat generating layer and or conductive layer to a uniform thickness, the base layer 100 in order to prevent the material forming the heat generating layer, etc. from penetrating the back surface of the base layer 100 The primer layer 200 may be formed on the upper portion of the substrate. However, the primer layer may be selectively formed on the fabric and may be excluded according to the characteristics of the fabric.

The primer layer 200 may be one or more selected from the group consisting of polyurethane resins, acrylic resins, silicone resins, and the like.

Meanwhile, the primer layer 200 according to the present invention may be formed of a single layer made of the material, and may be formed in a multilayer structure together with a water repellent layer (not shown). The water repellent layer may be performed by a general water repellent process, and may be made of a fluorine or silicon material as a non-limiting example. When the water repellent layer is formed, the heat generating layer and / or the conductive layer may be formed on the surface and / or the rear surface. In this case, the resin component constituting the heating layer and / or the conductive layer has an advantage of preventing the phenomenon of seeping into the fabric in the manufacturing process.

The heating layer 300 may be formed on the primer layer 200. The heating layer 300 may be formed by applying a conductive material or a mixture of a conductive material and a binder in a pre-designed form. The conductive material may be polyaniline, polypyrrole, polythiophene, or the like as a polymer, and conductive carbon Blacks may be mixed. It may also be selected from one or more of the group consisting of carbon, silver, gold, platinum, palladium, copper, aluminum, tin, iron and nickel.

1 illustrates an embodiment in which the conductive layer 400 is formed on the heating layer 300. The conductive layer 400 may be formed on a portion of the upper or lower portion of the heating layer 300 formed in a predesigned form. have.

2 illustrates another embodiment in which the conductive layer 400 is formed on the same plane as the heating layer 300, and the conductive layer 400 may be formed in the same pattern or in a different pattern as the heating layer 300. .

3 illustrates another embodiment in which the conductive layer 400 is formed under the heat generating layer 300.

The material constituting the conductive layer 400 may be a conductive polymer, a metal material such as carbon, silver, or a mixture of the above materials and a binder. Specifically, the conductive filler is dispersed in a vehicle and cured after printing. The film refers to a material exhibiting conductivity, and is commonly used for LCD electrode printing, touch screen printing, energizing pattern printing of circuit boards, printing of contact portions and pattern portions of thin film switch plates, and electromagnetic shielding. The conductive filler is preferably silver based among conductive metals (silver, gold, platinum, palladium, copper, nickel, and the like).

The binder material of the conductive layer may be one or more selected from the group consisting of polyurethane resin, acrylic resin, silicone resin, melamine resin and epoxy resin.

On the other hand, the metal material and the binder is preferably mixed at a ratio of 90:10 to 80:20 (by weight), but the binder has a problem that the conduction function is lowered when the binder exceeds the above range and the adhesive force is lowered when the binder is below the above range. There is a disadvantage.

The thickness of the heat generating layer 300 and / or conductive layer 400 is preferably 2 to 500㎛, if less than the range there is a problem that it is difficult to ensure the uniformity of the thickness of the conductive layer, the same if it exceeds the range The resistance value is lowered under the voltage, the current value increases, and eventually there is a problem that the power consumption increases. In addition, the width of the conductive layer 400 is preferably about 10 to 20mm. As the width of the conductive layer increases, the resistance value decreases, so that the current can be stably energized. In addition, there is a problem in coating properties. Meanwhile, the resistance value of the fabric according to the present invention is preferably maintained at 0.5 to 4 kV before and after washing, and the range below is difficult to be practically realized, and there is a problem in that the current flows stably when the range is exceeded.

An insulating layer 500 may be formed on the heating layer 300 and / or the conductive layer 400. The insulating layer 500 is coated with one or more selected from the group consisting of polyurethane resins, acrylic resins, silicone resins, polyester resins, PVC resins and polytetrafluoroethylene (PTFE) resins, printing or laminating an insulating layer ( 500). The insulating layer 500 prevents damage such as cracks in the conductive layer, imparts flexibility to the fabric, and performs waterproof or waterproof function.

Hereinafter will be described a method for manufacturing a heat generating fabric according to an embodiment of the present invention.

4 and 5 is a manufacturing process diagram showing a manufacturing method of a heating fabric according to an embodiment of the present invention.

As described above, when the fabric forming the base layer 100 is prepared, the fabric of the base layer is supplied between two pressing rollers in order to compensate for the disadvantages of surface irregularities in the case of the fabric or the knitted fabric. As a result, the surface of the base layer 100 may be smooth, the voids of the base layer 100 may be canceled, and the bending resistance may be compensated for. (Calendar step) This calendering step is selectively performed according to the characteristics of the fabric. It is a process that can be done.

The fabric having the base layer that has undergone the calendering step or not being calendered has a primer layer 200 for controlling the surface voids more actively and for uniformity of thickness of the heat generating layer 300 and / or the conductive layer 400. Can be formed. The primer layer 200 may be formed by a knife roller method, an over roll coating, a floating knife coating, or a knife over coating, laminating, printing or gravure coating. (The primer layer forming step) As described above, the primer layer may also be formed. May be optionally formed.

Meanwhile, in forming the primer layer, the primer layer may be formed as a multilayer structure by being formed together with the water repellent layer. The water repellent layer may be performed before or after the calendering step. The process diagram shown in FIG. 4 illustrates the step of forming a water repellent layer before the calendering step, and the process diagram shown in FIG. 5 illustrates the step of forming a water repellent layer and / or a primer layer after the calendering step, but is not limited thereto. It is not.

For the fabric having the primer layer 200 formed or the base layer, the heating layer 300 and / or the conductive layer 400 are formed according to a predesigned shape thereon. The heating layer 300 and / or the conductive layer 400 may be coated in various ways such as coating, printing, transfer printing, and the like. In the preferred embodiment of the present invention, a method of forming the heating layer 300 and / or the conductive layer 400 through printing will be described as an example. According to the printing method, the circuit can be designed on the fabric according to the designed form without being limited to the attachment position of the electronic equipment to be used.

In this regard, the fabric according to the present invention may be referred to as a flexible printed fabric circuit board (FPFCB).

The pattern formation of the printed circuit board may be designed such that the width and length of the conductive wire and the heating pattern according thereto are determined, and the resistance value is measured for each heating element.

6 illustrates an example in which a conductive layer and a heating layer are formed on a fabric according to an embodiment of the present invention, wherein a portion 430 that is bent in a circuit pattern of the conductive layer 400 is relatively wider than the linear circuit 410. An example formed in this wide form 450 is shown. 6 illustrates a circular shape as the above shape, but the shape is not limited thereto, and if the shape is wider than the width of the linear circuit, other shapes such as circular and elliptical may be adopted.

It is more preferable to form the bent portion 430 in a relatively wide shape 450, which may be supported by the following equation.

W = I ² R

R = ρL / S

W: power, R: resistance, ρ: specific resistance, L: length of conductor, S: cross-sectional area

As the area increases according to the above formula, the resistance decreases, and the flow of current increases with it. Therefore, since the bent portion 430 has a wide shape 450, it may be a factor of increasing the amount of current.

If the bent portion 430 of the conductive wire is formed at right angles or angles, a surge may occur due to a sudden change in current flow, thereby causing an exothermic reaction.

The surge phenomenon refers to a transient waveform of electric current, voltage, or power that is transmitted along a wire or an electric circuit and has a characteristic of rapidly increasing and decreasing gradually in a short time. Lightning days are the main causes of power cuts, phone calls, and the destruction of sensitive semiconductors. Strong or long surges, especially on power lines, can disrupt insulation or disrupt electronics, so install surge protectors or suppressors between the power and computer terminals to suppress or minimize current changes.

Therefore, in the present invention, by changing the area of the bent portion 430, the value of the lowering is lowered to minimize the occurrence of a surge phenomenon and to flow smoothly even if the amount of current increases.

The heating layer 300 and / or conductive layer 400 is 2 to 500㎛ thickness, 10 to 20mm width, the resistance of the fabric is preferably maintained before and after washing 0.5 ~ 4Ω. In addition, in the case of using carbon in the electrode 1 to 30% by weight, silver (silver) may be 1 to 70% by weight. The binder that may be used in the heat generating layer and / or the conductive layer may be one or more selected from the group consisting of a polyurethane resin, an acrylic resin, a silicone resin, a melamine resin, and an epoxy resin with compatibility with the primer layer 200. . (Heat generating layer forming step and / or conductive layer forming step)

After the heating layer 300 and / or the conductive layer 400 is formed, the insulating layer 500 may be formed thereon. The insulating layer 500 may be formed by directly coating, printing, or laminating a polyurethane resin, an acrylic resin, a silicone resin, a polyester resin, or a polytetrafluoroethylene (PTFE) resin. In the case of the coating method, a dry method is preferable, and in the case of a laminating method, a hot melt type dot or gravure method is preferable. (Insulation layer forming step)

In the case of the coating method in the insulating layer forming step, the resistance value varies depending on the coating composition, thereby affecting durability.

In addition, the insulating layer may be formed on both surfaces as well as the cross section.

Therefore, in view of the need for washing several times due to the nature of the fabric, the selection of a coating composition for the long-term insulation can appear, that is, excellent washing resistance can be exhibited is a very important factor.

On the other hand, after the calendering step, the waterproof fabric or waterproof treatment may be selectively processed to the fabric constituting the base layer 100. The pores formed by the moisture-permeable waterproof or waterproof treatment not only cancel the pores of the fabric constituting the base layer, but also serve to compensate for insulation, washing resistance, and bending resistance. It is preferable to apply a resin which is compatible with the conductive material as the material used for the moisture-permeable waterproofing process.

As described above, the heat generating fabric and the manufacturing method according to the present invention can be freely patterned, thereby realizing a heat generating function while ensuring various dynamic wearability.

In addition, the heat generating fabric and the manufacturing method according to the present invention can design the circuit regardless of bending or folding due to the elasticity, flexibility, and flex resistance, which are the characteristics of the fiber fabric, and the effect of circuit damage such as disconnection is extremely small. There is.

In addition, the exothermic fabric and the production method according to the present invention has the advantage that can be produced by a continuous process.

In addition, the exothermic fabric and manufacturing method according to the present invention has the effect of actively expressing the exothermic function, while retaining the function as a cloth (clothing), such as coatability, comfort, moisture permeability.

In addition, the fabric and manufacturing method according to the present invention has a merit that the heating layer / conductive layer can be maintained uniformly because of the presence of a primer layer, thereby allowing a constant current to be energized.

In addition, the heat generating fabric and the method of manufacturing the same according to the present invention, when the printed circuit pattern is formed on the original fabric, the bending point of the circuit pattern is formed in a circular shape, the cross-sectional area is wide, there is an effect that the current flows smoothly.

In addition, the fabric and manufacturing method according to the present invention has the effect of improving the tensile strength and elongation by forming the insulating layer of a mixture of materials compatible with the heating layer and / or conductive layer.

In addition, the fabric and manufacturing method according to the present invention has the effect of controlling the wear strength and the flex resistance according to the printing order of the conductive layer and the heating layer in the heating layer and / or conductive layer.

In addition, the fabric and manufacturing method according to the present invention has the effect of having durability by washing by forming an insulating layer coated on one or both sides of the fabric.

It will be described in detail through the following examples.

Example 1

After forming a primer layer with a solvent-type polyurethane resin on a polyester plain weave fabric, a conductive layer is formed first with a silver paste component on the primer layer, and a heat generating layer is printed with a polypyrrole resin on the conductive layer. It is formed by printing once. In this case, an acrylic crosslinking agent was used. In addition, the shape of the bending point of the circuit was formed in a circular predesigned heating pattern. It was then coated with a water dispersible polyurethane composition to form an insulating layer in the cross section.

Example 2

In the same manner as in Example 1, the binder of the heating layer and / or conductive layer was a urethane-based crosslinking agent.

Example 3

In the same manner as in Example 1, but was formed by coating the insulating layer on both sides.

Example 4

 As in Example 2 above, the insulating layer was formed by coating on both sides.

Example 5

As in Example 1 above, the heating layer was first printed, and then a conductive layer was formed.

Example 6

As in Example 5 above, the binder of the heating layer and / or conductive layer was a urethane-based crosslinking agent.

Example 7

As in Example 5 above, the insulating layer was formed by coating on both sides.

Example 8

As in Example 6 above, but was formed by coating the insulating layer on both sides.

Example 9

In the same manner as in Example 1, but using a solvent-dispersed silicone (A) as a coating composition of the insulating layer to form an insulating layer in the cross section.

Example 10

As in Example 9 above, the binder of the heating layer and / or conductive layer was a urethane-based crosslinking agent.

Example 11

As in Example 9 above, it was formed by coating the insulating layer on both sides.

Example 12

As in Example 10 above, the insulating layer was formed by coating on both sides.

Example 13

As in Example 9 above, the heating layer was formed first, and then the conductive layer was formed in a printing form.

Example 14

As in Example 13 above, the binder of the heating layer and / or conductive layer was a urethane-based crosslinking agent.

Example 15

As in Example 13 above, the insulating layer was formed by coating on both sides.

Example 16

As in Example 14 above, the insulating layer was formed by coating on both sides.

Example 17

In the same manner as in Example 1, but using a solvent-dispersed silicone (B company) as a coating composition of the insulating layer to form an insulating layer in the cross section.

Example 18

As in Example 17, the binder of the heating layer and / or conductive layer was a urethane-based crosslinking agent.

Example 19

As in Example 17 above, the insulating layer was formed by coating on both sides.

Example 20

As in Example 18, except that the insulating layer was coated on both sides.

Example 21

As in Example 17 above, the heating layer was formed first, and then the conductive layer was formed.

Example 22

As in Example 21, but the binder of the heating layer and / or conductive layer was used a urethane-based crosslinking agent.

Example 23

As in Example 21 above, but was formed by coating the insulating layer on both sides.

Example 24

As in Example 22 above, but was formed by coating the insulating layer on both sides.

Example 25

In the same manner as in Example 1, but using a liquid silicone rubber as a coating composition of the insulating layer to form an insulating layer in the cross section.

Example 26

* Same as Example 25 above, but the urethane-based crosslinking agent was used as the binder of the heating layer and / or conductive layer.

Example 27

As in Example 25 above, the insulating layer was formed by coating both sides.

Example 28

As in Example 26 above, the insulating layer was formed by coating on both sides.

Example 29

As in Example 25 above, the heating layer was first formed in the heating layer and / or the conductive layer, and then the conductive layer was formed.

Example 30

As in Example 29 above, the binder of the heating layer and / or conductive layer was a urethane-based crosslinking agent.

Example 31

As in Example 29 above, the insulating layer was formed by coating both sides.

Example 32

As in Example 30 above, the insulating layer was formed by coating both sides.

Comparative Example 1

In addition to forming a primer layer with a solvent-type polyurethane resin on a fabric of polyester plain weave, a fabric was prepared in which no heating layer and / or conductive layer were formed and no insulation layer was formed.

Comparative Example 2

As in Comparative Example 1, an insulating layer was formed in a cross section using a solvent-dispersed polyurethane as the coating composition of the insulating layer.

Comparative Example 3

As in Comparative Example 2, the insulating layer was formed on both sides.

Comparative Example 4

In the same manner as in Comparative Example 1, but using a solvent-dispersed silicon A as the coating composition of the insulating layer to form an insulating layer in the cross section.

Comparative Example 5

As in Comparative Example 4, the insulating layer was formed on both sides.

Comparative Example 6

In the same manner as in Comparative Example 1, an insulating layer was formed in a cross section using a solvent-dispersed silicon B as the coating composition of the insulating layer.

Comparative Example 7

As in Comparative Example 6, the insulating layer was formed on both sides.

Comparative Example 8

As in Comparative Example 1, an insulating layer was formed in a cross section using liquid silicone rubber as the coating composition of the insulating layer.

Comparative Example 9

As in Comparative Example 8, the insulating layer was formed on both sides.

Comparative Example 10

As in Example 1, but no insulating layer was formed.

Comparative Example 11

As in Comparative Example 10, a binder of the heating layer and / or conductive layer was used a urethane-based crosslinking agent.

Comparative Example 12

In the same manner as in Comparative Example 10, in the heating layer and / or the conductive layer, a heating layer was first formed, and then a conductive layer was formed.

Comparative Example 13

As in Comparative Example 12, a binder of the heating layer and / or the conductive layer was a urethane-based crosslinking agent.

* Test Methods

1. Measurement of resistance change rate

Check the resistance by measuring the resistance before and after the coating of the insulating layer with an Ohm meter to determine the insulation change.

% Change in resistance = {(post-coated-pre-coated) / pre-coated} X 100

As a result of the above test, in the insulating layer, the resistance change rate was greater when coated with silicon-based (Examples 9 and 27), in particular, solvent-dispersed silicon (Examples 9 and 19) than with urethane-based (Examples 1 and 3). In addition, it was confirmed that the resistance after coating was increased more than both sides than the cross section, and the resistance change rate was also increased. On the other hand, in the case of the liquid silicone rubber (Example 25), the resistance decreased rather than the single side coating, but the resistance slightly increased during the double side coating.

2. Tensile strength: KSK 0520

Elongation and tensile strength of the Examples and Comparative Examples were measured three times to obtain an average value. The grip interval was 76 mm, the tensile speed was 5 mm / min, the load was 1 KN (100 kgf), the temperature was 73F, and the humidity was 50%. Table 3 below shows the test results of each Example and Comparative Examples.

7 to 10 are graphs showing the change in tensile strength and elongation according to the binder type. FIG. 7 is a graph showing the change in tensile strength when silicone / polyurethane is coated according to the binder type added to the conductive material. According to the type of binder added to the silicone / polyurethane coating shows the change in elongation, Figure 9 shows the tensile strength of the heating pattern printing presence / absence fabric according to the silicon stage / double-sided coating, Figure 10 It shows the elongation of the heating pattern printing on / off fabric according to the double-sided coating. In the graph, "untreated" indicates that the heating pattern was printed but not coated, and "Silicon C / T" means that the heating pattern was printed and cross-coated with silicone resin, and "PU C / T" heating pattern was printed and poly It means that the surface coating treatment with a urethane-based resin, "PU-A" means a polyurethane-based binder, "AC-A" means an acrylic binder.

When the polyurethane-based binder was added from the graphs, the polyurethane-coated exothermic pattern was similar to the non-coated exothermic pattern, but the tensile strength was observed to decrease when the silicon-coated. In addition, when the acrylic binder was added, the tensile strength was increased after coating, and when the polyurethane binder was treated with the polyurethane coating, the tensile strength was observed to be higher.

In the case of elongation change, elongation was increased after coating regardless of binder type, which is believed to increase flexibility.

Referring to FIGS. 9 and 10, "heating pattern printing X" is a coating treatment without printing a conductive polymer and an electrode, and "heating pattern printing O" is a printing and coating process of a conductive polymer (including an acrylic binder) and an electrode. It means that both the single-side coating and double-side coating was found to decrease the tensile strength when printing the heating pattern. This means that the fabric is broken even by a weak force due to the heating pattern printing, and it is judged to be more broken when coated on both sides than the one-side coating. Elongation increased when double-sided coating was applied than single-sided coating, and elongation decreased when heating pattern was printed.

3. Flexibility: KS K 0855: 2004, C method ((Crumple / Flex method)

After sewing a rectangular coated fabric in the shape of a cylinder, cylindrical specimens are made by holding each end on two opposing disks. Thereafter, one of the disks was subjected to a 90 degree torsional movement, while the other disk was reciprocated in the axial direction to bend the test piece, and the torsion and compression movements were continued 1,000, 5,000, 10,000 times, and then the resistance was Measured.

To find out the durability of the garment, the difference in resistance after the flex resistance test according to the printing order of the heating layer and the conductive layer in the heating layer and / or the conductive layer, and the difference in resistance before and after coating in the insulating layer I saw it.

As a result, when the conductive layer was first printed on the heating layer and / or the conductive layer, and then the heating layer was printed, the resistance change was relatively stable. 10 to 11 are graphs showing the resistance change rate according to the formation order of the heating layer and / or the conductive layer.

4. Laundry resistance

Exam conditions

The samples prepared in Examples and Comparative Examples were measured for each wash under the conditions (see Table 5).

% Change in resistance = {(resistance after washing-resistance after coating) / resistance after washing} X100

As shown in Table 6 below, as the number of washing increases, the resistance increases, but the resistance change rate decreases as compared with before washing. In addition, the resistance when coating both sides (Example 27) was lower than the one side (Example 25) coating. Therefore, even if the number of times of washing was increased, it was confirmed that the durability of washing was low due to low resistance increase.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

In particular, in the description of the present invention, only the example applied to the smart clothing, but the conductive material according to the present invention can be applied as a circuit board or parts of the electronic device itself.

1 to 3 is a cross-sectional view of the heat generating fabric according to an embodiment of the present invention.

4 and 5 is a manufacturing process of the heat generating fabric according to an embodiment of the present invention.

Figure 6 is a cross-sectional view of the bending point of the circuit according to a preferred embodiment of the present invention.

7 to 10 are graphs showing changes in tensile strength and elongation according to binder type.

11 and 12 are graphs showing the rate of change of resistance according to the order of formation of the heating layer and / or the conductive layer.

<Description of Major Symbols in Drawing>

10: heat generating fabric 100: base layer

200: primer layer 300: heating layer

400: conductive layer 500: insulating layer

Claims (14)

In the manufacturing method of the exothermic fabric, Forming a conductive layer on top of the base layer made of synthetic fibers, recycled fibers or natural fibers; Forming a heat generating layer such that a part or all of the conductive layer is in contact with the conductive layer on the same plane of the conductive layer; And Forming an insulating layer for the electrical shield on top of the conductive layer and the heating layer, And a calendering step of smoothing the surface of the base layer, offsetting the voids of the base layer, and pressing the fabric of the base layer with a compression roller to compensate for the bending resistance. The method of claim 1, Method of applying the heating layer or the conductive layer is a method of manufacturing a heating element, characterized in that at least one selected from the group consisting of coating, printing and transfer printing. The method of claim 1, The heating layer or conductive layer is a method of manufacturing a heating element, characterized in that the conductive material or a conductive material and a binder is formed by mixing. The method of claim 3, The conductive material is a method for producing a heating element, characterized in that at least one selected from the group consisting of a conductive polymer, carbon, silver, gold, platinum, palladium, copper, aluminum, tin, iron and nickel. The method of claim 3, The binder is a method of producing a heating element, characterized in that at least one selected from the group consisting of polyurethane resin, acrylic resin, silicone resin, melamine resin and epoxy resin. The method of claim 5, The binder is a method for producing a exothermic fabric, characterized in that the water-dispersible polyurethane. The method of claim 4, wherein The conductive polymer is polyaniline, polypyrrole, polythiophene method for producing a heating element, characterized in that at least one selected from the group consisting of. The method of claim 3, The conductive material and the binder forming the conductive layer is a method for producing a heating element, characterized in that included in the content ratio of 90:10 to 80:20 by weight. The method of claim 1, The conductive layer is a method for producing a heating element, characterized in that the heating layer in contact with at least two points. The method of claim 1, The thickness of the heat generating layer or conductive layer is a manufacturing method of a heat generating fabric, characterized in that 2 to 500㎛. The method of claim 1, The width of the conductive layer is a manufacturing method of the heating element, characterized in that 10 to 20mm. The method of claim 1, The insulating layer is formed by coating, printing or laminating at least one selected from the group consisting of a polyurethane resin, an acrylic resin, a silicone resin, a polyester resin, a PVC resin, and a polytetrafluoroethylene (PTFE) resin. Method for producing a heating fabric characterized in that. The method of claim 1, The insulation layer is a dry coating method in the case of direct coating, a hot melt type dot or gravure method of manufacturing in the case of laminating. The method of claim 1, The resistance value of the fabric is a method of producing a heating fabric, characterized in that 0.5 to 4 내지 before and after washing.

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