KR-20260065285-A - Thermosetting foam type binder composition, magnetic pad including the same, and wireless charging device including the same

KR20260065285AKR 20260065285 AKR20260065285 AKR 20260065285AKR-20260065285-A

Abstract

The present invention relates to a thermosetting foamed binder composition, a magnetic pad containing the same, and a wireless charging device. Specifically, the invention relates to a thermosetting foamed binder composition comprising a polymer main resin and a foaming agent, the thermosetting foamed binder composition having thermosetting and foaming characteristics, a magnetic pad containing the same, and a wireless charging device.

Inventors

김영민
임태욱
이정인
천명수
정유석
홍승민
김광규
강경훈

Assignees

현대자동차주식회사
기아 주식회사
주식회사 케이씨씨

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (12)

It includes a polymer resin and a foaming agent, A thermosetting foamed binder composition characterized by a foaming initiation temperature of 70 to 110 ℃, a foaming rate of 50 to 400%, and a viscosity of 3,000 to 100,000 cP.
In Article 1, A thermosetting foamed binder composition characterized by the above-mentioned polymer main resin and foaming agent being mixed and included in a weight ratio of 80:1 to 10:1.
In Article 1 The above polymer main resin is, A first solution comprising vinyldimethylpolysiloxane; and A thermosetting foamed binder composition characterized by being a two-component polymer resin comprising a second component containing organohydrogenpolysiloxane.
In Paragraph 3, The above first solution further comprises dimethylpolysiloxane, and A thermosetting foamed binder composition characterized by the above-mentioned second liquid further comprising vinyldimethylpolysiloxane.
In Paragraph 4, The above first liquid is, 25 to 35 parts by weight of vinyldimethylpolysiloxane; and It comprises 1 to 10 parts by weight of dimethylpolysiloxane, and The above second liquid is 20 to 30 parts by weight of vinyldimethylpolysiloxane; and A thermosetting foamed binder composition characterized by comprising 5 to 15 parts by weight of organohydrogenpolysiloxane.
In Article 1, A thermosetting foamed binder composition characterized by comprising at least one selected from the group consisting of azo-based, hydrazide-based, inorganic, and microcapsule-based foaming agents.
In Article 1, A thermosetting foamed binder composition characterized in that the foaming agent is a capsule-type foaming agent with a particle size of 10 to 30 μm.
65 to 95 parts by weight of magnetic pellets; 10 to 25 parts by weight of magnetic powder; and A magnetic pad comprising 1.5 to 7 parts by weight of a thermosetting foamed composition according to any one of claims 1 to 7.
In Article 8, A magnetic pad characterized in that the magnetic material is MnZn ferrite.
In Article 8, A magnetic pad characterized in that the magnetic pellet is a spherical MnZn ferrite pellet with a diameter of 2 mm to 5 mm.
In Article 8, A magnetic pad characterized in that the magnetic powder is MnZn ferrite powder with a diameter of 75 μm to 85 μm.
A wireless charging element including a magnetic pad according to claim 8.

Description

Thermosetting foam type binder composition, magnetic pad including the same, and wireless charging device including the same The present invention relates to a thermosetting foamed binder composition, a magnetic pad containing the same, and a wireless charging device. Specifically, the invention relates to a thermosetting foamed binder composition comprising a polymer main resin and a foaming agent having thermosetting and foaming characteristics, a magnetic pad containing the same, and a wireless charging device. With the recent expansion of electric vehicles, interest in wireless charging technology, which allows for the free charging of batteries without the need for wired chargers, is increasing. Wireless charging technology fundamentally consists of a transmitter that sends power and a receiver that receives the transmitted power; these transmitters and receivers are composed of coils and magnetic materials. The magnetic material used in this process is one of the key components determining the efficiency of wireless charging and is provided in the form of a pad within the wireless charging device. While ferrite tiles have primarily been applied to these magnetic pads, ferrite tiles have the disadvantage of being brittle due to the inherent properties of ceramic tiles, making them vulnerable to impact and difficult to manufacture in three-dimensional shapes. In particular, the receiver (vehicle) of an electric vehicle wireless charging system has the disadvantage that the ferrite tile magnetic material can be easily damaged by vibrations and external impacts during driving. To overcome these drawbacks, efforts are continuously being made to manufacture ferrite magnetic materials that are resistant to external impact. Specifically, research is being conducted on flexible materials that can replace brittle ferrite tiles, and active research is also being carried out on binders optimized for these materials. FIG. 1 is an image of the appearance of Example 5-2 and Comparative Example 3-2 of the present invention observed visually. FIG. 2 is an image of the appearance of Example 1-2 and Comparative Example 4-2 of the present invention observed visually. Figure 3 is a graph comparing the density and permeability of an embodiment and a comparative example of the present invention. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. In this application, terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. The thermosetting foamed binder composition of the present invention may include a polymer main resin and a foaming agent. In the present invention, the polymer main resin may include at least one selected from the group consisting of silicone resin, urethane resin, epoxy resin, polyester resin, and acrylic resin. In various embodiments of the present invention, the polymer main resin may be a two-component polymer resin. In one example, the polymer main resin may be a two-component polymer resin comprising a first component comprising vinyldimethylpolysiloxane and a second component comprising organohydrogenpolysiloxane. The above first solution may further include dimethylpolysiloxane. The first liquid above may contain 25 to 35 parts by weight of vinyldimethylpolysiloxane and 1 to 10 parts by weight of dimethylpolysiloxane. The above second liquid may further include vinyldimethylpolysiloxane. The second liquid above may contain 20 to 30 parts by weight of vinyldimethylpolysiloxane and 5 to 15 parts by weight of organohydrogenpolysiloxane. In one embodiment of the present invention, the first liquid and th