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CN-121991634-A - Thermosetting foam adhesive composition, magnetic pad comprising same and wireless charging device comprising same

CN121991634ACN 121991634 ACN121991634 ACN 121991634ACN-121991634-A

Abstract

The present invention provides a thermosetting foam adhesive composition, which may include a main polymer resin and a foaming agent, the thermosetting foam adhesive composition having a foaming temperature of 70 ℃ to 110 ℃, a foaming rate of 50% to 400%, and a viscosity of 3000cP to 100000cP. The magnetic pad may comprise such a thermoset foam adhesive composition. The wireless charging device may include such a magnetic pad.

Inventors

  • JIN RONGMIN
  • LI ZHENREN
  • HONG CHENGMIN
  • JIN GUANGKUI
  • JIANG JINGXUN
  • QIAN MINGZHU
  • Ren Taiyu
  • ZHENG YUXI

Assignees

  • 现代自动车株式会社
  • 起亚株式会社
  • 株式会社KCC

Dates

Publication Date
20260508
Application Date
20250210
Priority Date
20241101

Claims (13)

  1. 1. A thermoset foam adhesive composition comprising: A main polymer resin, and The foaming agent is used for preparing the foaming agent, Wherein the heat curable foam adhesive composition has a foaming temperature of 70 ℃ to 110 ℃, a foaming rate of 50% to 400%, and a viscosity of 3000cP to 100000cP.
  2. 2. The composition of claim 1, wherein the main polymer resin and the blowing agent are mixed in a weight ratio of the main polymer resin and the blowing agent ranging from 80:1 to 10:1.
  3. 3. The composition of claim 1, wherein the primary polymeric resin is a two-component polymeric resin comprising: a first component comprising a vinyl dimethyl polysiloxane; a second component comprising an organohydrogen polysiloxane.
  4. 4. The composition of claim 3, wherein the first component further comprises a dimethylpolysiloxane, wherein the second component further comprises a vinyldimethylpolysiloxane.
  5. 5. The composition of claim 4 wherein the first component comprises 25 to 35 parts by weight of vinyl dimethylpolysiloxane, and 1 to 10 parts by weight of dimethylpolysiloxane, and Wherein the second component comprises 20 to 30 parts by weight of vinyl dimethyl polysiloxane, and 5 to 15 parts by weight of organohydrogen polysiloxane.
  6. 6. The composition of claim 1, wherein the foaming agent comprises at least one selected from the group consisting of azo-based foaming agents, hydrazide-based foaming agents, inorganic-based foaming agents, and microcapsule-based foaming agents.
  7. 7. The composition of claim 1, wherein the blowing agent is a capsule blowing agent having a particle size of 10 to 30 μιη.
  8. 8. A magnetic mat comprising 1.5 to 7 parts by weight of a thermosetting foam adhesive composition comprising: a main polymer resin, and The foaming agent is used for preparing the foaming agent, Wherein the heat curable foam adhesive composition has a foaming temperature of 70 ℃ to 110 ℃, a foaming rate of 50% to 400%, and a viscosity of 3000cP to 100000cP.
  9. 9. The magnetic pad of claim 8, wherein the primary polymer resin is a two-component polymer resin comprising: A first component comprising a vinyl dimethylpolysiloxane, wherein the first component further comprises a dimethylpolysiloxane, wherein the first component comprises 25 to 35 parts by weight vinyl dimethylpolysiloxane, and 1 to 10 parts by weight dimethylpolysiloxane, and A second component comprising an organohydrogen polysiloxane, wherein the second component further comprises a vinyl dimethyl polysiloxane, wherein the second component comprises 20 to 30 parts by weight of vinyl dimethyl polysiloxane, and 5 to 15 parts by weight of organohydrogen polysiloxane.
  10. 10. The magnetic pad according to claim 9, wherein the foaming agent comprises at least one selected from the group consisting of azo-based foaming agents, hydrazide-based foaming agents, inorganic-based foaming agents and microcapsule-based foaming agents, Wherein the foaming agent is a capsule-type foaming agent having a particle size of 10 μm to 30 μm, Wherein the main polymer resin and the foaming agent are mixed in a mixing ratio of the main polymer resin and the foaming agent ranging from 80:1 to 10:1 by weight.
  11. 11. A wireless charging device comprising the magnetic pad of claim 8.
  12. 12. The wireless charging device of claim 11, wherein the primary polymeric resin is a two-component polymeric resin comprising: A first component comprising a vinyl dimethylpolysiloxane, wherein the first component further comprises a dimethylpolysiloxane, wherein the first component comprises 25 to 35 parts by weight vinyl dimethylpolysiloxane, and 1 to 10 parts by weight dimethylpolysiloxane, and A second component comprising an organohydrogen polysiloxane, wherein the second component further comprises a vinyl dimethyl polysiloxane, wherein the second component comprises 20 to 30 parts by weight of vinyl dimethyl polysiloxane, and 5 to 15 parts by weight of organohydrogen polysiloxane.
  13. 13. The wireless charging device according to claim 12, wherein the foaming agent comprises at least one selected from the group consisting of azo-based foaming agents, hydrazide-based foaming agents, inorganic-based foaming agents and microcapsule-based foaming agents, Wherein the foaming agent is a capsule-type foaming agent having a particle size of 10 μm to 30 μm, Wherein the main polymer resin and the foaming agent are mixed in a weight ratio of 80:1 to 10:1.

Description

Thermosetting foam adhesive composition, magnetic pad comprising same and wireless charging device comprising same Cross Reference to Related Applications The present application claims the benefit of priority from korean patent application No. 10-2024-0153507, filed on 1 month 11 of 2024 to the korean intellectual property office, the entire disclosure of which is incorporated herein by reference. Technical Field The invention relates to a thermosetting foam adhesive composition, a magnetic pad comprising the composition, and a wireless charging device comprising the magnetic pad. Background In recent years, as the supply amount of electric vehicles has been increased, there has been an increasing interest in wireless charging technology capable of freely charging batteries without a wired charger. Wireless charging technology consists essentially of a transmitter that transmits power and a receiver that receives the transmitted power, both of which are composed of a coil and a magnetic material. The magnetic material used herein is one of key components determining wireless charging efficiency, and is provided in the wireless charging device in the form of a pad (pad). These magnetic pads mainly employ ferrite magnetic sheets (FERRITE TILE), but because of the property of the ceramic magnetic sheets that they are susceptible to impact, ferrite magnetic sheets are very brittle and have a disadvantage in that it is difficult to make three-dimensional shapes. In particular, in the case of a receiver (vehicle) for a wireless charging system of an electric automobile, there is a disadvantage in that a ferrite-magnetic sheet magnetic material is easily damaged by vibration and external impact during traveling. To overcome this disadvantage, efforts have been made to manufacture ferrite magnetic materials resistant to external impacts. In particular, flexible materials capable of replacing ferrite magnetic sheets having strong brittleness are being studied, and adhesives optimizing these materials are also being actively studied. Disclosure of Invention The present invention relates to a thermosetting foam type adhesive composition, a magnetic pad including the same, and a wireless charging device including the magnetic pad, and more particularly, to a thermosetting foam type adhesive composition including a main polymer resin and a foaming agent, having thermosetting properties and foaming properties, a magnetic pad including the composition, and a wireless charging device including the magnetic pad. Embodiments of the present invention can solve the above-mentioned problems occurring in the related art, and can provide a thermosetting foam type adhesive composition including a polymer resin and a foaming agent, which expands in volume and simultaneously cures (cured) when exposed to heat, thereby exhibiting excellent impact resistance and mechanical properties, a magnetic pad including the same, and a wireless charging device including the magnetic pad. Embodiments of the present invention may provide a thermosetting foam adhesive composition comprising a main polymer resin and a foaming agent, the thermosetting foam adhesive composition having a foaming temperature of 70 ℃ to 110 ℃, a foaming rate of 50% to 400%, and a viscosity of 3000cP to 100000cP. Embodiments of the present invention may provide a magnetic mat comprising 65 to 95 parts by weight of magnetic material particles, 10 to 25 parts by weight of magnetic material powder, and 1.5 to 7 parts by weight of the thermosetting foam composition according to various embodiments of the present invention. Embodiments of the present invention may provide a wireless charging device including a magnetic pad according to embodiments of the present invention. According to an embodiment of the present invention, in a magnetic pad including the adhesive composition, a volume expansion and curing reaction may occur upon molding by pressurization or heating. Thus, with the embodiment of the present invention, excellent appearance, mechanical strength, and impact resistance can be ensured. The magnetic pad according to the embodiment of the present invention may have excellent electromagnetic properties and may resist external impact. The adhesive composition according to the embodiment of the present invention may have excellent moldability when mixed with ferrite particles or powder, thereby improving workability. Thus, magnetic pads comprising such adhesive compositions may also have a higher degree of freedom of design according to embodiments of the present invention. Drawings The foregoing and other features and advantages of exemplary embodiments of the invention will be apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings in which: Fig. 1 shows appearance images observed with naked eyes in examples 5-2 and comparative examples 3-2 of an exemplary embodiment of the present invention; Fig