Elastomer composition and magnetic ferrite coated with the same
Provided are an elastomer composition including epoxy resin, acrylate resin, an organic filler, an inorganic filler, a cross linking agent, a hardener, an initiator and a solvent, and a magnetic ferrite for a wireless power transmitting and receiving device, the magnetic ferrite being coated with the elastomater composition having an elastic restoring force not to be damaged by a physical impact applied from the outside. According to embodiments of the present invention, the magnetic ferrite having improved impact resistance can be provided by being coating with the elastomer composition having the elastic restoring force, and thus an existing problem such as a reduction in magnetic property caused by damage to the ferrite resulting from an external impact can be solved.
1. An elastomer composition, comprising:
3 to 5 parts by weight of an epoxy resin;
12 to 15 parts by weight of an acrylate resin;
20.5 to 21.5 parts by weight of an organic filler;
3 to 25 parts by weight of an inorganic filler;
10 to 30 parts by weight of a cross linking agent;
1 to 5 parts by weight of a hardener;
1 to 5 parts by weight of an initiator; and
20 to 24 parts by weight of a solvent,
wherein the solvent includes 4 to 10 parts by weight of a reactive solvent based on 100 parts by weight of a total amount of the elastomer composition,
wherein a weight ratio of a solid state to a liquid state of the epoxy resin is 1:1 to 3:1, and
wherein the acrylate resin is polymerized into a resin by small molecules of one selected from a group consisting of tripropylene glycol diacrylate, dipropylene glycol diacrylate, cyclododecyl acrylate and 1,6-hexanediol diacrylate, or a mixture thereof.
2. The elastomer composition of claim 1 , wherein the epoxy resin is one selected from a group consisting of bisphenol A, bisphenol F, bisphenol S, cresol novolac, and phenoxy-based epoxy, or a mixture thereof.
3. The elastomer composition of claim 1 , wherein the acrylate resin is polymerized into a resin by small molecules from a mixture of tripropylene glycol diacrylate and dipropylene glycol diacrylate.
4. The elastomer composition of claim 1 , wherein the organic filler is one selected from a group consisting of liquid polybutadiene, acrylonitrile butadiene, glycidyl acrylate and styrene butadiene, or a mixture thereof.
5. The elastomer composition of claim 1 , wherein the cross linking agent is one selected from a group consisting of epoxy-terminated butadieneacrylonitrile rubber and carboxy-terminated butadieneacrylonitrile rubber, or a mixture thereof.
6. The elastomer composition of claim 1 , wherein the hardener is one selected from a group consisting of peroxide, hydroperoxide, peroxidicarbonate and peroxiiester-based hardener, or a mixture thereof.
7. The elastomer composition of claim 1 , further comprising one hardening accelerator or two or more hardening accelerators selected from a group consisting of an amine-based hardening accelerator, a peroxide-based hardening accelerator, and a phenol-based hardening accelerator.
8. A magnetic ferrite coated with an elastomer composition according to claim 1 .
9. The magnetic ferrite of claim 8 , wherein the elastomer composition is coated on at least one or more surface selected from an upper surface, a lower surface and both sides of the magnetic ferrite.
10. The magnetic ferrite of claim 8 , wherein the magnetic ferrite is coated with the elastomer composition in an elastic film form.
11. The magnetic ferrite of claim 10 , wherein the elastic film is porous.
12. A wireless power transmitting and receiving device comprising a magnetic ferrite according to claim 8 .