KR20200055387A - Self-heating flexible device based on textile for volatile organic compound removal and manufacturing method thereof - Google Patents

Abstract

One embodiment of the present invention provides a fabric-based self-heating flexible element and a method of manufacturing the same. The fabric-based self-heating flexible element comprises: a fabric substrate woven with a plurality of fiber filaments intersecting one another; a heating electrode layer formed on the surface of the fiber filaments of the fabric substrate; and a catalyst layer formed on the heating electrode layer, wherein volatile organic compound (VOC) gases are eliminated by activating the catalyst layer by means of heat generated when a voltage is applied to the heating electrode layer. Accordingly, the fabric-based self-heating flexible element can increase a contact area with VOC-containing gas or fluid by means of the fabric substrate, and can effectively eliminate VOCs in a relatively low reaction temperature range (approximately 120°C or less).

Description

Self-heating flexible device based on textile for volatile organic compound removal and manufacturing method thereof

The present invention relates to an apparatus for reducing a volatile organic compound (VOC) by coating a nano-catalyst on a fabric-based flexible device having a function of self-heating, and a manufacturing method thereof.

Volatile Organic Compounds (VOCs) are mostly generated by human industrial activities, and in recent years, these problems have occurred in metropolitan areas where a large number of people are inhabited due to the rapid increase in the number of cars or the increase in the use of various fossil fuels. It is being taken more and more seriously. In recent years, VOCs released into the atmosphere have emerged as an environmental problem in landfills that process increased waste as production and consumption increase.

Among the methods for treating volatile organic compounds (VOC) and organic solvents, the most commonly used treatment methods are activated carbon adsorption or post-adsorption combustion and catalytic oxidation. However, the activated carbon adsorption method has a good treatment efficiency, but because of the short break-through point, there is a problem that the activated carbon must be frequently exchanged, which results in a high operating cost and, when the replacement cycle of the activated carbon is exceeded, volatile organic compounds are directly released into the atmosphere. . When removing by combustion, the existing method is to supply oxygen and generate a flame to burn and remove VOC at a relatively high temperature of 650 ~ 800 ℃, to treat 99% or more of VOC pollutants contained in exhaust gas. A direct oxidation device was used. The catalytic oxidation method is a method of oxidizing and removing VOC generated from a stationary source, and it can effectively remove VOC at a lower reaction temperature than the direct combustion method, and it is economical and easy to expand equipment due to low annual operation cost. Therefore, the technology of removing VOC at a low reaction temperature is an important clean technology because it reduces the energy by reducing the reaction temperature while simultaneously reducing the environmentally harmful compounds.

Republic of Korea Registered Patent No. 10-1832849

Technical problem to be achieved by the present invention is a fabric-based self-coating that can effectively remove VOC at a relatively low reaction temperature by coating a heating element and a catalyst having a self-heating function on a fabric substrate through which a fluid containing VOC can pass. It is to provide a heating flexible element and a manufacturing method thereof.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs from the following description. There will be.

In order to achieve the above technical problem, an embodiment of the present invention provides a fabric-based self-heating flexible device. The fabric-based self-heating flexible device includes a plurality of fiber yarns 111 interwoven with each other and a woven fabric base 110, a heating electrode layer 120 formed on the surface of the fiber yarn 111 of the fabric base 110, and A catalyst layer 130 formed on the heating electrode layer 120 may be included. In this case, the catalyst layer may be activated by heat generated when power is applied to the heating electrode layer 120 to remove volatile organic compound (VOC) gas.

In addition, the fabric base is a group consisting of cotton, wool, nylon, polypropylene, polyacrylonitrile, polyester, polyphenylene sulfide, m-polyaramid, polyimide, polytetrafluoroethylene, glass and ceramic fibers. It may be formed of one or more materials selected.

In addition, the fabric base material may be a single-layer or multi-layer structure in which the plurality of fiber yarns are interwoven with each other.

In addition, the heating electrode layer may include metal, metal oxide, graphene, carbon nanotube, carbon fiber, conductive polymer or conductive ceramics.

Further, the catalyst layer may include metal or metal oxide.

In addition, a fiber protection layer may be additionally formed between the fiber yarn and the heating electrode layer.

In addition, it may include an additional catalyst material doped on the catalyst layer or coated on the catalyst layer.

In order to achieve the above technical problem, another embodiment of the present invention provides an air purification system. The air purification system may include a fabric-based self-heating flexible device according to an embodiment of the present invention.

In order to achieve the above technical problem, another embodiment of the present invention provides a method for manufacturing a fabric-based self-heating flexible device. The fabric-based self-heating flexible device comprises: preparing a fabric base in which a plurality of fiber yarns cross each other, forming a heating electrode layer on the surface of the fiber yarn of the fabric base, and depositing a catalyst material on the heating electrode layer It may include the step of forming a catalyst layer. At this time, the catalyst layer may be activated by heat generated when power is applied to the heating electrode layer to remove volatile organic compound (VOC) gas.

In addition, after the step of preparing the fabric base, it may further include the step of forming a fiber protective layer on the surface of the fiber yarn.

In addition, the fabric base material may be a single-layer or multi-layer structure in which the plurality of fiber yarns are interwoven with each other.

According to an embodiment of the present invention, VOC can be effectively removed at a low reaction temperature (less than about 120 ° C) compared to the prior art by using a fabric substrate, a heating electrode layer, and a catalyst layer that serve as a physically primary filter. . Specifically, since the fabric substrate has flexibility and breathability, it is possible to increase the VOC reduction efficiency by increasing the area that reacts with VOC. In addition, the fabric base material has flexibility and is excellent in processability compared to the existing metal bulk thin plate, and thus can be applied to the VOC reduction system in various forms. In addition, the fabric base may serve as a physically primary filter. In addition, the thermal energy in the heating electrode layer is effectively transferred to the catalyst layer and the VOC without heat loss, thereby improving the VOC reduction efficiency.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects that can be deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a top view of the fabric base 110.
Figure 2 is a cross-sectional view for explaining the detailed configuration of the fabric-based self-heating flexible device according to an embodiment of the present invention.
3 is a cross-sectional view for explaining a structure in which the fiber protection layer 113 is further formed.
4 is a graph measuring temperature values according to power applied to a fabric-based self-heating flexible device according to an embodiment of the present invention.
5 is a graph measuring the VOC decomposition performance of a fabric-based self-heating flexible device according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and thus is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is "connected (connected, contacted, coupled)" with another part, it is not only "directly connected" but also "indirectly connected" with another member in between. "It also includes the case where it is. Also, when a part “includes” a certain component, this means that other components may be further provided instead of excluding other components, unless otherwise stated.

The terms used herein are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and that one or more other features are present. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

A fabric-based self-heating flexible device according to an embodiment of the present invention will be described. The fabric-based self-heating flexible device includes a plurality of fiber yarns interwoven with each other and a woven fabric base 110, a heating electrode layer 120 and the heating electrode layer formed on the surface of the fiber yarn 111 of the fabric base 110 ( 120) may include a catalyst layer 130 formed on.

Hereinafter, the fabric-based self-heating flexible device will be described in detail with reference to the accompanying drawings.

1 is a top view of the fabric base 110. Referring to FIG. 1, the fabric base 110 may be formed in a shape in which a plurality of elongated fiber yarns 111 intersect each other at regular intervals. In addition, it may include a through-hole 112 formed by the spacing between the plurality of fiber yarns (111).

2 is a cross-sectional view for explaining the detailed configuration of the fabric-based self-heating flexible device. Referring to FIG. 2, the heating electrode layer 120 may be formed on the surface of the fiber yarn 111, and the catalyst layer 130 may be formed on the heating electrode layer 120. The catalyst layer 130 may be activated by heat generated when a voltage is applied to the heating electrode layer 120, through which a volatile organic compound introduced through the through hole 112 or passing through the surface of the fabric-based self-heating flexible device (VOC) Gas can be removed.

In the case of the heating method of burning and removing conventional VOCs, there is a disadvantage in that energy use is high in that both the gas including the VOCs and the temperature of the system must be raised. In the case of the decomposition method using a catalyst, most catalysts have high efficiency at a high temperature, and thus, there is a disadvantage in that efficiency is low in a low temperature condition. In addition, platinum is mostly used as a low-temperature catalyst that can be used at low temperatures, but since platinum is a precious metal, its economic efficiency is low, and its surface is contaminated during long-term use, resulting in reduced efficiency and requiring replacement and additional management. Other than this, there is a method of simultaneously using heating and a catalyst. The conventional method of simultaneously using heating and a catalyst uses a solid bulk thin substrate as a lower substrate. However, when a bulk thin plate is used as a heater substrate, there is a limit in widening the specific surface area that reacts with VOC, and in most cases, a fluidized bed containing VOC passes rapidly in an industrial site, so there is a problem that it is difficult to effectively remove VOC.

The fabric-based self-heating flexible device according to an embodiment of the present invention may use a fiber fabric as a substrate to increase a reaction area. Specifically, since the textile fabric is breathable, a reaction area can be widened by a gas or liquid containing VOC passing through the textile fabric. In addition, the textile fabric is excellent in processing and manufacturing flexibility, and can be processed into various shapes by applying it as a stack or roll. In addition, compared to the conventional method using a bulk thin plate, the weight of the fiber fabric compared to the volume is light, and thus there is an advantage that it is possible to lighten the material and the device. In addition, the fabric substrate can physically reduce VOC by performing a primary filter role.

The fabric base 110 may be used without limitation as long as it is a material that provides sufficient support for the heating electrode layer 120 and the catalyst layer 130 and can be stably maintained under a high temperature environment. For example, the fabric substrate is made of cotton, wool, nylon, polypropylene, polyacrylonitrile, polyester, polyphenylene sulfide, m-polyaramid, polyimide, polytetrafluoroethylene, glass and ceramic fibers. It may be formed of one or more materials selected from the group. For the desired effect, polypropylene, polyacrylonitrile, polyphenylene sulfide, polyimide, polytetrafluoroethylene, glass or ceramic fibers, which are excellent in heat resistance and chemical stability, are more preferable as the material for the fabric base 110.

In addition, the fabric base 110 may be formed of a single-layer or multi-layer structure in which a plurality of fiber yarns 111 intersect each other. When formed in a multi-layer structure, the reaction area can be widened compared to the single-layer structure. In addition, due to the complex internal structure compared to the single-layer structure, it is advantageous to remove VOC by increasing the residence time of the gas or flow rate containing VOC.

The heating electrode layer 120 may be formed on the surface of the fiber yarn 111. Heat may be generated by applying power to the heating electrode layer 120, and the generated thermal energy may be converted into carbon dioxide and water by burning VOCs. In addition, heat energy may be transferred to and activated by the catalyst layer 130 formed on the heating electrode layer 120. Since the fabric-based self-heating flexible device uses the heating method and the decomposition by a catalyst at the same time as compared to the conventional heating-only method, VOC can be effectively removed at a relatively low reaction temperature (below about 120 ° C).

The heating electrode layer 120 may be sufficient as a material capable of generating resistance heat when power is applied. For example, the heating electrode layer 120 may include metal, metal oxide, graphene, carbon nanotube, carbon fiber, conductive polymer or conductive ceramics. For example, the heating electrode layer 120 is Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ru, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, B, Al, Ga, In, Tl Si, GE , Sn, Pb, As, Sb, Bi, TE, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Db, Ho, Er, Tm Yb and Lu selected from the group consisting of metals or oxides thereof It can contain. In addition, the heating electrode layer 120 includes indium tin oxdie (ITO), indium zinc oxide (IZO), tin oxide (SnO2), antimony-doped tin oxdie (ATO), al-doped zinc oxide (AZO), gallium-GZO Doped zinc oxdie) and FTO (fluorine-doped tin oxide) may include any metal oxide selected from the group consisting of.

The heating electrode layer 120 may have a resistance value capable of generating appropriate resistance heat when power is applied. If the resistance value is too low, there is a problem that the heat of resistance is not sufficient to activate the catalyst layer 130 and burn VOC. If the resistance value is too large, there is a problem that energy efficiency is deteriorated. Therefore, for a desired effect, the resistance of the heating electrode layer 120 may be 0.4 to 1.0 Ω, and more preferably 0.5 to 0.7. When the electric power is applied when it has such a resistance range, the fabric-based self-heating flexible device can maintain a maximum of 200 ° C to burn VOC and activate the catalyst layer 130.

3 is a cross-sectional view for explaining a structure in which the fiber protection layer 113 is further formed. Referring to FIG. 3, the fiber protection layer 113 may be formed between the fiber yarn 111 and the heating electrode layer 120. At this time, the fiber protective layer 113 can improve the mechanical stability of the fabric base 110 and prevent the fiber yarn 111 from being damaged from heat generated in the heating electrode layer 120. The fiber protection layer 113 may be formed of an insulating material. For example, the fiber protective layer 113 may include silicone rubber or PVC.

The catalyst layer 130 may burn (oxidize) VOC at a relatively low temperature with carbon dioxide and water by lowering activation energy required for combustion of VOC. In the case of direct incineration without using a catalyst, the temperature of the combustion chamber should be maintained at 800 to 900 ° C, but when the catalyst is used, an oxidation reaction occurs at a temperature as low as 200 to 400 ° C. Fabric-based self-heating flexible device according to an embodiment of the present invention by using a fabric substrate to increase the reaction area of the catalyst and effectively transfer thermal energy to the catalyst layer 130 through the heating electrode layer 120, relatively low temperature compared to the prior art VOCs can be effectively burned under conditions (below about 120 ° C).

The catalyst layer 130 may include a catalyst suitable for activating the combustion reaction of VOC. The catalyst may be a metal or metal oxide. For example, the catalyst may be any metal selected from the group consisting of Au, Ag, Pt, Co, Cr, Cu, V, Mo, Ni, Pd, Cu and Mn or an oxide thereof. In addition, the catalyst is MnO ₂ , ZnO, TiO ₂ , MnCl ₂ , Mn (NO ₃ ) ₂ , MnSO ₄ , Mn (ClO ₄ ) ₂ , CuCl ₂ , Cu (NO ₃ ) ₂ , CuSO ₄ , Cu (ClO ₄ ) ₂ , Cr ₂ O ₃ / Al ₂ O ₃ , Co ₃ O ₄ And CuO-Mn ₂ O _{3 It} may be any one selected from the group consisting of.

An additional catalyst material may be included in the catalyst layer 130. The additional catalyst material may be different from the catalyst included in the existing catalyst layer 130. In this case, the additional catalyst material may be doped into the catalyst layer 130 or added in a form coated on the surface of the catalyst layer 130. By doping or coating the additional catalyst material on the existing catalyst layer 130, the combustion reaction of VOC can be activated more effectively than when only the existing catalyst layer 130 is formed, thereby effectively burning VOC at a lower temperature condition. At this time, the additional catalyst material may be used without limitation as long as it is doped or coated on the catalyst layer 130 to activate the combustion reaction of VOC. For example, the additional catalyst material may include one or more metals selected from the group consisting of Au, Ag, and Pt.

Next, an air purifying system according to another embodiment of the present invention will be described. The air purification system may include the fabric-based self-heating flexible device according to an embodiment of the present invention. Since the fabric-based self-heating flexible device uses a fiber fabric having flexible properties as a base material, it can be applied to a VOC reduction system in various forms because of its excellent processability and ultra-light weight compared to the existing bulk thin plate. Specifically, it can be used in automotive and power plant SCR (Selective Catalytic Reduction) system devices, indoor and outdoor air cleaners, portable air cleaners, and odor reduction devices.

Next, a method of manufacturing a fabric-based self-heating flexible device according to another embodiment of the present invention will be described. The fabric-based self-heating flexible device manufacturing method comprises preparing a woven fabric base material in which a plurality of fiber yarns cross each other, forming a heating electrode layer on the fiber yarn surface of the fabric base material, and a catalyst on the heating electrode layer. It may include the step of depositing a material to form a catalyst layer. At this time, the catalyst layer may be activated by heat generated when a voltage is applied to the heating electrode layer to remove volatile organic compound (VOC) gas.

In addition, after the step of preparing the fabric base, it may further include the step of forming a fiber protective layer on the surface of the fiber yarn. As a result, the fiber protection layer may be formed between the fiber yarn and the heating electrode layer. At this time, the fiber protective layer can improve the mechanical stability of the fabric base material and prevent the fiber yarn from being damaged from heat generated in the heating electrode layer. The fiber protection layer may be formed of an insulating material. For example, the fiber protection layer may include silicone rubber or PVC.

In the step of preparing the fabric base material, the fabric base material may be formed of a single layer or a multi-layer structure in which the plurality of fiber yarns intersect each other. When formed in a multi-layer structure, the reaction area can be widened compared to the single-layer structure. In addition, due to the complex internal structure compared to the single-layer structure, it is advantageous to remove VOC by increasing the residence time of the gas or flow rate containing VOC.

Hereinafter, the present invention will be described in more detail through production examples and experimental examples. However, the present invention is not limited to manufacturing examples and experimental examples.

<Production Example>

Glass fiber was selected as the fabric base material, and silver (Ag) was selected as the heating electrode layer material, and silver (Ag) plating was performed on the glass fiber surface. Glass fiber has a heat resistance at 200 ~ 300 ° C is suitable as a fabric substrate of the present invention. MnO ₂ was selected as the catalyst material, and accordingly, MnO ₂ was deposited on the surface of the silver-plated glass fiber to form a catalyst layer. Fabric-based self-heating flexible devices were prepared by doping a small amount of gold (Au) particles on the surface of the MnO ₂ catalyst layer.

<Comparative Example>

In the manufacturing example, a fabric-based self-heating flexible device was manufactured in the same manner as in the manufacturing example, except that the MnO ₂ catalyst layer was not formed.

<Experimental Example 1>

An experiment was conducted to check the temperature value according to the power applied to the fabric-based self-heating flexible device. To this end, the fabric-based self-heating flexible device manufactured according to the above manufacturing example was connected to an external power source using silver paste. Thereafter, power was applied to measure the resulting temperature value, and the results are shown in FIG. 4. Referring to FIG. 4, it can be seen that the temperature increases as the applied power increases. From this, it can be seen that when applying electric power, resistance heat is generated in the heating electrode layer made of silver (Ag) and the catalyst layer is activated by the transferred thermal energy.

<Experimental Example 2>

An experiment was conducted to check the VOC removal performance of fabric-based self-heating flexible devices. To this end, the fabric-based self-heating flexible device manufactured by the above-mentioned Preparation Examples and Comparative Examples was connected to an external power source using a silver paste, and the decomposition performance of formaldehyde (100 ppm) in the gas to be treated was measured. 5 is a graph showing the measurement result accordingly. Referring to FIG. 5, it can be seen that the fabric-based self-heating flexible device according to the manufacturing example has excellent decomposition performance of formaldehyde compared to the case of the comparative example. Specifically, about 50% of the total formaldehyde was decomposed at about 85 ° C, and it was confirmed that more than 95% of the formaldehyde was decomposed by reaching about 120 ° C. Through this, it is confirmed that the fabric-based self-heating flexible device of the present invention can effectively remove VOC under low temperature conditions (below about 120 ° C) compared to the prior art that decomposed VOC in a temperature range of about 200 to 400 ° C. Can.

The above description of the present invention is for illustration only, and those skilled in the art to which the present invention pertains can understand that the present invention can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted to be included in the scope of the present invention.

110: fabric base
111: fiber yarn
112: through hole
113: fiber protective layer
120: heating electrode layer
130: catalyst layer

Claims (11)

A fabric base material in which a plurality of fiber yarns cross each other and are woven;
A heating electrode layer formed on the surface of the fiber yarn of the fabric substrate; And
It includes; a catalyst layer formed on the heating electrode layer,
Fabric-based self-heating flexible device, characterized in that to remove the volatile organic compound (VOC) gas by activating the catalyst layer by heat generated when a voltage is applied to the heating electrode layer. According to claim 1,
The fabric base material is selected from the group consisting of cotton, wool, nylon, polypropylene, polyacrylonitrile, polyester, polyphenylene sulfide, m-polyaramid, polyimide, polytetrafluoroethylene, glass and ceramic fibers. Fabric-based self-heating flexible device characterized in that it is formed of one or more materials. According to claim 1,
The fabric base is a fabric-based self-heating flexible device, characterized in that the plurality of fiber yarns are a single layer or a multi-layer structure interwoven with each other. According to claim 1,
The heating electrode layer is a fabric-based self-heating flexible device comprising metal, metal oxide, graphene, carbon nanotube, carbon fiber, conductive polymer or conductive ceramics. According to claim 1,
The catalyst layer is a fabric-based self-heating flexible device, characterized in that it comprises a metal or a metal oxide. According to claim 1,
Fabric-based self-heating flexible device, characterized in that a fiber protective layer is further formed between the fiber yarn and the heating electrode layer. According to claim 1,
Fabric-based self-heating flexible device, characterized in that it comprises an additional catalyst material doped on the catalyst layer or coated on the catalyst layer. An air cleaning system comprising the fabric-based self-heating flexible device according to any one of claims 1 to 7. Preparing a woven fabric base material in which a plurality of fiber yarns cross each other;
Forming a heating electrode layer on the surface of the fiber yarn of the fabric base; And
Including the step of forming a catalyst layer by depositing a catalyst material on the heating electrode layer,
Method of manufacturing a fabric-based self-heating flexible device, characterized in that to remove the volatile organic compound (VOC) gas by activating the catalyst layer by heat generated when a voltage is applied to the heating electrode layer. The method of claim 9,
After the step of preparing the fabric substrate, the method of manufacturing a fabric-based self-heating flexible device further comprising the step of forming a fiber protective layer on the surface of the fiber yarn. The method of claim 9,
The fabric base is a method of manufacturing a fabric-based self-heating flexible device, characterized in that the plurality of fiber yarns are a single layer or a multi-layer structure interwoven with each other.

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