Search

US-12628246-B2 - Planar heating element, and clothing management apparatus, hot/cold water purifier and floor heating panel for building, comprising the same

US12628246B2US 12628246 B2US12628246 B2US 12628246B2US-12628246-B2

Abstract

A planar heating element according to the present invention is configured such that a pair of wires are inserted into a matrix formed by forming a base resin and a conductive material, so that heat is generated by means of electrical resistance that is generated inside the matrix when power is applied, wherein the planar heating element has a simple structure and is easy to manufacture and can achieve a sufficient heating effect regardless of thermal conductivity. In addition, the planar heating element is divided into a heating part and a non-heating part, and the heating part and the non-heating part are integrally manufactured through a double injection molding method. Thus, the present invention has advantages in that various shapes of planar heating elements can be manufactured and that manufacturing costs and manufacturing time can be reduced due to the manufacturing process being simple.

Inventors

  • Dong Soo Shin

Assignees

  • S PLUS COMTECH CO., LTD.

Dates

Publication Date
20260512
Application Date
20220125
Priority Date
20210203

Claims (13)

  1. 1 . A planar heating element comprising a heating part, which is configured such that a pair of wires are inserted into a matrix formed by forming a conductive composite material in which a base resin and a conductive material are mixed with each other, the pair of wires being spaced apart from each other by a predetermined distance, so that heat is generated by means of electrical resistance that is generated inside the matrix when power is applied, wherein the conductive material comprises: carbon members dispersed into the base resin and forming an electrical network; and metal powders interposed between the carbon members, increasing the electrical network by the carbon members and increasing thermal conductivity of the conductive composite material to transfer electrical resistance heat generated by the carbon members to a surface of the heating part, and an amount of the base resin in the conductive composite material is 60 to 72w %, and an amount of the carbon members in the conductive composite material is greater than or equal to 10w % and less than or equal to 17w % so as to form the electrical network, and a diameter of the metal powders in the conductive composite material is 10 nm to 100 nm, and an amount of the metal powders is greater than or equal to 12w % so as to increase an electrical network between the carbon members and to increase thermal conductivity of the conductive composite material, and is less than or equal to 22w % so as to reduce specific gravity of the conductive composite material, and specific gravity of the conductive composite material is 0.8 to 1.3, wherein the specific gravity is measured by a method according to ASTM D792, resistivity of the conductive composite material is 2 to 10 Ωmm 2 /m, and thermal conductivity of the conductive composite material is 156 to 235 kcal/mh° C.
  2. 2 . The planar heating element of claim 1 , wherein a tensile strength of the conductive composite material is 180 to 200 kgf/cm 2 , wherein the tensile strength is measured by a method according to ASTM D638.
  3. 3 . The planar heating element of claim 1 , wherein the carbon members comprise carbon nanotubes and graphene, and a mixture ratio of the graphene and the carbon nanotubes is 1w %: 10w %.
  4. 4 . The planar heating element of claim 1 , wherein the carbon members comprise at least one of carbon fibers and carbon nanotubes, and a length of the carbon members is 1 to 100 μm.
  5. 5 . The planar heating element of claim 1 , wherein the metal powders comprise aluminum powder.
  6. 6 . The planar heating element of claim 1 , wherein the base resin comprises a non-conductive resin including acrylonitrile-butadiene-styrene (ABS), silicon, polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), or polydimethylsiloxane (PDMS), and a conductive resin including polypyrrole (PPy), and an amount of the conductive resin in the base resin is greater than 0 and is less than or equal to 10w %.
  7. 7 . The planar heating element of claim 1 , wherein the conductive composite material further comprises a stabilizer and additives, and an amount of the stabilizer is 0.1 to 0.6w %, and an amount of the additives is 0.4 to 2.1w %.
  8. 8 . The planar heating element of claim 1 , wherein the wires comprise at least one of aluminum wires, copper alloy wires, copper wires, and conductive composite material wires.
  9. 9 . The planar heating element of claim 1 , further comprising a non-heating part that is distinguished from the heating part, is integrally formed and is formed of a material having lower electrical conductivity than the conductive composite material.
  10. 10 . The planar heating element of claim 9 , wherein the wires are insert injection molded into the matrix, and the heating part and the non-heating part are double injection molded.
  11. 11 . A clothing management apparatus using a planar heating element, the clothing management apparatus comprising an ironing board for removing wrinkle or forming knife creases of pants by pressing a clothing, wherein the ironing board is a planar heating element planar including a heating part, which is configured such that a pair of wires are inserted into a matrix formed by forming a conductive composite material in which a base resin and a conductive material are mixed with each other, the pair of wires being spaced apart from each other by a predetermined distance, so that heat is generated by means of electrical resistance that is generated inside the matrix when power is applied, and the conductive material comprises: carbon members dispersed into the base resin and forming an electrical network; and metal powders interposed between the carbon members, increasing the electrical network by the carbon members and increasing thermal conductivity of the conductive composite material to transfer electrical resistance heat generated by the carbon members to a surface of the heating part, and an amount of the base resin in the conductive composite material is 60 to 72w %, and an amount of the carbon members in the conductive composite material is greater than or equal to 10w % and less than or equal to 17w % so as to form the electrical network, and a diameter of the metal powders in the conductive composite material is 10 nm to 100 nm, and an amount of the metal powders is greater than or equal to 12w % so as to increase an electrical network between the carbon members and to increase thermal conductivity of the conductive composite material, and is less than or equal to 22w % so as to reduce specific gravity of the conductive composite material, and specific gravity of the conductive composite material is 0.8 to 1.3, wherein the specific gravity is measured by a method according to ASTM D792, resistivity of the conductive composite material is 2 to 10 Ωmm 2 /m, and thermal conductivity of the conductive composite material is 156 to 235 kcal/mh° C.
  12. 12 . A hot/cold water purifier using a planar heating element, the hot/cold water purifier comprising a planar heating element provided to be in contact with at least one side of a hot water tank in which hot water is accommodated, wherein the planar heating element comprises a heating part, which is configured such that a pair of wires are inserted into a matrix formed by forming a conductive composite material in which a base resin and a conductive material are mixed with each other, the pair of wires being spaced apart from each other by a predetermined distance, so that heat is generated by means of electrical resistance that is generated inside the matrix when power is applied, and the conductive material comprises: carbon members dispersed into the base resin and forming an electrical network; and metal powders interposed between the carbon members, increasing the electrical network by the carbon members and increasing thermal conductivity of the conductive composite material to transfer electrical resistance heat generated by the carbon members to a surface of the heating part, and an amount of the base resin in the conductive composite material is 60 to 72w %, and an amount of the carbon members in the conductive composite material is greater than or equal to 10w % and less than or equal to 17w % so as to form the electrical network, and a diameter of the metal powders in the conductive composite material is 10 nm to 100 nm, and an amount of the metal powders is greater than or equal to 12w % so as to increase an electrical network between the carbon members and to increase thermal conductivity of the conductive composite material, and is less than or equal to 22w % so as to reduce specific gravity of the conductive composite material, and specific gravity of the conductive composite material is 0.8 to 1.3, wherein the specific gravity is measured by a method according to ASTM D792, resistivity of the conductive composite material is 2 to 10 Ωmm 2 /m, and thermal conductivity of the conductive composite material is 156 to 235 kcal/mh° C.
  13. 13 . A floor heating panel for a building using a planar heating element, the floor heating panel comprising a planar heating element provided on the floor heating panel for the building, wherein the planar heating element comprises a heating part, which is configured such that a pair of wires are inserted into a matrix formed by forming a conductive composite material in which a base resin and a conductive material are mixed with each other, the pair of wires being spaced apart from each other by a predetermined distance, so that heat is generated by means of electrical resistance that is generated inside the matrix when power is applied, and the conductive material comprises: carbon members dispersed into the base resin and forming an electrical network; and metal powders interposed between the carbon members, increasing the electrical network by the carbon members and increasing thermal conductivity of the conductive composite material to transfer electrical resistance heat generated by the carbon members to a surface of the heating part, and an amount of the base resin in the conductive composite material is 60 to 72w %, and an amount of the carbon members in the conductive composite material is greater than or equal to 10w % and less than or equal to 17w % so as to form the electrical network, and a diameter of the metal powders in the conductive composite material is 10 nm to 100 nm, and an amount of the metal powders is greater than or equal to 12w % so as to increase an electrical network between the carbon members and to increase thermal conductivity of the conductive composite material, and is less than or equal to 22w % so as to reduce specific gravity of the conductive composite material, and specific gravity of the conductive composite material is 0.8 to 1.3, wherein the specific gravity is measured by a method according to ASTM D792, resistivity of the conductive composite material is 2 to 10 Ωmm 2 /m, and thermal conductivity of the conductive composite material is 156 to 235 kcal/mh° C.

Description

TECHNICAL FIELD The present invention relates to a planar heating element, a hot/cold water purifier, a floor heating panel for a building, and a clothing management apparatus using the planar heating element, and more particularly, to a planar heating element in which a pair of wires are inserted into a conductive composite material including a base resin and a conductive resin so that a manufacturing process is simple and heat can be generated when power is applied, a hot/cold water purifier, a floor heating panel for a building, and a clothing management apparatus including the planar heating element. BACKGROUND ART A commonly used electric heater is a typical sheath heater, and is a tubular heater in which a heating wire is embedded in a coil shape in a metal protective tube and filled with magnesium oxide, an insulating powder, to insulate the heating wire and the protective tube. These sheath heaters are robust against external physical impact and have high efficiency of electric thermal energy, and can be processed and used in various shapes suitable for the user's purpose and shape. Recently, electric heaters are used in various products, and thus, concerns for planar heating elements that are more compact and can be easily manufactured are increasing. Since planar heating elements according to the related art are manufactured by using a method of stacking a plurality of sheets or coating a heating layer on the plurality of sheets, a manufacturing process is complicated, and long manufacturing time is required. DETAILED DESCRIPTION OF THE INVENTION Technical Problem The present invention provides a planar heating element which has a simple manufacturing process and can be manufactured in various shapes, a clothing management apparatus, a hot/cold water purifier, and a floor heating panel for a building including the planar heating element. Technical Solution According to an aspect of the present invention, there is provided a planar heating element including: a heating part, which is configured such that a pair of wires are inserted into a matrix formed by forming a conductive composite material in which a base resin and a conductive material are mixed with each other, to be spaced apart from each other by a predetermined distance, so that heat is generated by means of electrical resistance that is generated inside the matrix when power is applied, wherein the conductive material includes: carbon members dispersed into the base resin and forming an electrical network; and metal powders interposed between the carbon members, increasing the electrical network by the carbon members and increasing thermal conductivity of the conductive composite material to transfer electrical resistance heat generated by the carbon members to a surface of the heating part, and a content of the base resin in the conductive composite material is 60 to 72 w %, and a content of the carbon members in the conductive composite material is greater than or equal to 10 w % and less than or equal to 17 w % so as to form the electrical network, and a diameter of the metal powders in the conductive composite material is 10 nm to 100 nm, and a content of the metal powders is greater than or equal to 12 w % so as to increase an electrical network between the carbon members and to increase thermal conductivity of the conductive composite material, and is less than or equal to 22 w % so as to reduce specific gravity of the conductive composite material, and specific gravity (experimental results according to ASTM D792) of the conductive composite material is 0.8 to 1.3, resistivity of the conductive composite material is 2 to 10 Ωmm2/m, and thermal conductivity of the conductive composite material is 156 to 235 kcal/mh° C. A tensile strength (experimental results according to ASTM D638) of the conductive composite material may be 180 to 200 kgf/cm 2. The carbon members may include carbon nanotubes and graphene, and a mixture ratio of the graphene and the carbon nanotubes is 1 w %:10 w %. The carbon members may include at least one of carbon fibers and carbon nanotubes, and a length of the carbon members may be 1 to 100 μm. The metal powders may include aluminum powder. The base resin may include a non-conductive resin including acrylonitrile-butadiene-styrene (ABS), silicon, polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), or polydimethylsiloxane (PDMS), and a conductive resin including polypyrrole (PPy), and a content of the conductive resin in the base resin may be greater than 0 and may be less than or equal to 10 w %. The conductive composite material may further include a stabilizer and additives, and a content of the stabilizer is 0.1 to 0.6 w %, and a content of the additives is 0.4 to 2.1 w %. The wires may include at least one of aluminum wires, copper alloy wires, copper wires, and conductive composite material wires. The planar heating element may further include a non-heating part that is distinguish