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KR-20260063105-A - Thermochromic Dielectric Heater Composition and Thermochromic Dielectric Heater

KR20260063105AKR 20260063105 AKR20260063105 AKR 20260063105AKR-20260063105-A

Abstract

The present invention relates to a thermochromic dielectric heater composition and a thermochromic dielectric heater. One embodiment has high performance and high flexibility by adding PC and EC. A thermochromic dielectric heater composition according to an embodiment of the present invention comprises a polymer resin; a thermochromic pigment; a main plasticizer; propylene carbonate (PC) and ethylene carbonate (EC).

Inventors

  • 배진우
  • 최승은
  • 오승주

Assignees

  • 한국기술교육대학교 산학협력단

Dates

Publication Date
20260507
Application Date
20241030

Claims (10)

  1. Polymer resin; Thermochromic pigment; Plasticizer; Propylene carbonate (PC) and Containing ethylene carbonate (EC), Thermochromic dielectric heater composition.
  2. In paragraph 1, The combined content ratio of the above polymer resin and the above main plasticizer, propylene carbonate, and ethylene carbonate is 1:5.5 to 1:6.5 based on weight, Thermochromic dielectric heater composition.
  3. In paragraph 1, The combined content ratio of the above main plasticizer, propylene carbonate, and ethylene carbonate is 2.5:1 to 3.5:1 by weight, Thermochromic dielectric heater composition.
  4. In paragraph 1, The content ratio of the above propylene carbonate and ethylene carbonate is 1:8.5 to 1:9.0 based on weight, Thermochromic dielectric heater composition.
  5. In paragraph 1, The content ratio of the polymer resin and the main plasticizer is 1:4 to 1:5 based on weight, Thermochromic dielectric heater composition.
  6. In paragraph 1, The combined content ratio of the above polymer resin, propylene carbonate, and ethylene carbonate is 1:1 to 1:2 based on weight, Thermochromic dielectric heater composition.
  7. In paragraph 1, The content ratio of the polymer resin and the thermochromic pigment is 1:0.1 to 1:0.3 based on weight, Thermochromic dielectric heater composition.
  8. A step of preparing a polymer resin solution by dissolving a polymer resin in a solvent; A step of preparing a mixture by mixing a main plasticizer, propylene carbonate, ethylene carbonate, and a thermochromic pigment into the above polymer resin solution, and A step comprising drying the above mixture, Method for manufacturing a thermochromic dielectric heater layer.
  9. In paragraph 8, The combined content ratio of the polymer resin, the main plasticizer, propylene carbonate, and ethylene carbonate added in the step of preparing the above mixture is 1:5.5 to 1:6.5 based on weight, Method for manufacturing a thermochromic dielectric heater layer.
  10. A thermochromic dielectric heater comprising the thermochromic dielectric heater layer of claim 9.

Description

Thermochromic Dielectric Heater Composition and Thermochromic Dielectric Heater The present invention relates to a thermochromic dielectric heater composition and a thermochromic dielectric heater. One embodiment has high performance and high flexibility by adding PC and EC. The present invention is the result of research conducted with funding from the Ministry of Science and ICT and supported by the National Research Foundation of Korea (RS-2024-00348475). Thermochromic dielectric heaters are attracting attention as devices that provide temperature control, visual feedback, and energy efficiency by utilizing dielectric properties and thermochromic characteristics, which change color when a specific temperature is reached. These heaters are primarily manufactured by adding pigments to polymer-based substrates, and when voltage is applied, electrical energy is converted into thermal energy, causing the surface temperature of the heater to rise and the color to change accordingly. These thermochromic dielectric heaters can be utilized in various fields, such as home appliances, building materials, and medical devices, and offer significant advantages, particularly in that users can visually and immediately determine the operating status or temperature of the heater. Conventional thermochromic dielectric heaters lack flexibility, which limits their application in environments where they are bent or curved. Additionally, they suffer from poor thermal stability at high temperatures, leading to performance degradation or material deformation during prolonged use. FIG. 1 is a flowchart of a method for manufacturing a thermochromic dielectric heater layer according to an embodiment of the present invention. Figure 2 shows the results of measuring the dielectric constant of the dielectric heater layer. FIG. 3 shows the results of measuring the dielectric constant of a dielectric heater layer of another embodiment. Figure 4 shows the results of the loss factor analysis of the dielectric heater layer. Figure 5 is the result of the stress-strain curve analysis of the dielectric heater layer of another embodiment. Figure 6 shows the results of measuring the thermal decomposition temperature of the dielectric heater layer. Figure 7 is the result of measuring the dielectric constant of a thermochromic dielectric heater layer according to an embodiment of the present invention. Figure 8 shows the results of measuring the thermal decomposition temperature of the thermochromic dielectric heater layer. Figure 9 shows the stress-strain curve analysis results of the thermochromic dielectric heater layer. FIG. 10 illustrates a color change according to voltage and elongation of a thermochromic dielectric heater according to an embodiment of the present invention. Hereinafter, preferred embodiments of the present invention are described as follows with reference to the attached drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. A thermochromic dielectric heater composition according to an embodiment of the present invention comprises a polymer resin; a thermochromic pigment; a main plasticizer; propylene carbonate (PC) and ethylene carbonate (EC). The above polymer resin serves as a substrate for a thermochromic dielectric heater. The polymer resin acts as an electrical insulator, providing stability during the process of converting electrical energy into thermal energy, and imparts flexibility, enabling use in various application environments. Furthermore, the polymer resin enhances thermal conductivity and, when combined with thermochromic pigments, ensures effective heat transfer and a distinct change in color in response to temperature variations. Additionally, the polymer resin possesses high heat resistance, maintaining its physical and chemical properties even during prolonged use, thereby ensuring stable performance of the heater. The above polymer resin may be polyvinyl chloride (PVC), polyurethane (PU), polysiloxane (silicone resin), polyethylene terephthalate (PET), etc., and preferably may be polyvinyl chloride. The above thermochromic pigment is a material that changes color according to the temperature change of a thermochromic dielectric heater. In one embodiment, the thermochromic pigment may have the characteristic of changing color through a temperature rise that occurs when voltage is applied to the thermochromic dielectric heater, and returning to its original color when the voltage is cut off. In the present invention, the thermochromic pigment is not particularly limited and various types can be applied. In one embodiment, the thermochromic pigment may be an inorganic thermochromic pigment, a polymer thermochromic pigment, a leuco dye,