Rust inhibitor for gasket, gasket for secondary battery including same, and secondary battery including gasket for secondary battery

1. A rust inhibitor for a gasket comprising:

an anti-rust material; and

a polymer resin,

wherein the polymer resin includes at least one of polyethylene or a copolymer which includes 2 or more derived units selected from the group consisting of an ethylene-derived unit, a propylene-derived unit, a butylene terephthalate-derived unit, an ethylene terephthalate-derived unit, and a methyl acrylate-derived unit, and

the anti-rust material includes a compound of Formula 1 below:

(A) m -R  [Formula 1]

wherein, in Formula 1,

R is any one of a saturated or unsaturated aliphatic hydrocarbon group having 5 to 20 carbon atoms or an aromatic hydrocarbon group having 6 to 18 carbon atoms,

A is a functional group including at least any one of an oxygen atom, a nitrogen atom or a fluorine atom, wherein a hydrogen atom of R is substituted with the functional group, and

m is 1 to 3,

wherein the weight ratio of the polymer resin to the anti-rust material is 99:1 to 80:20.

2. The rust inhibitor of claim 1 , wherein the anti-rust material comprises at least one of a compound of Formula 1-1 or a compound of Formula 1-2 below:

(A) m -R  [Formula 1]

A 1 -R 2 -A 2   [Formula 1-2]

wherein R 1 is any one selected from the group consisting of a linear alkyl group having 8 to 20 carbon atoms, a branched alkyl group having 8-20 carbon atoms, an alkenyl group having 8 to 20 carbon atoms, alkynyl having 8 to 20 carbon atoms, and an aryl group having 8 to 18 carbon atoms,

R 2 is any one selected from the group consisting of a linear alkylene group having 8 to 20 carbon atoms, a branched alkylene group having 8 to 20 carbon atoms, an alkenylene group having 8 to 20 carbon atoms, alkynylene having 8 to 20 carbon atoms, and an arylene group having 8 to 18 carbon atoms, and

A 1 and A 2 are each independently any one selected from the group consisting of a carboxyl group, an amino group, a nitro group, a hydroxy group, and a fluorine group.

3. The rust inhibitor of claim 2 , wherein the anti-rust material comprises at least one of a compound of Formula 1-3 or a compound of Formula 1-4 below:

wherein, in Formula 1-3 and Formula 1-4, p is 4 to 10, and q is 3 to 6.

4. The rust inhibitor of claim 3 , wherein the anti-rust material comprises at least one selected from the group consisting of decanoic acid, lauric acid, and myristic acid.

5. A gasket for a secondary battery, the gasket comprising:

a rust inhibitor for a gasket of claim 1 ; and

a base resin.

6. The gasket of claim 5 , wherein the rust inhibitor is included in the gasket for a secondary battery in an amount of 2 wt % to 15 wt %.

7. The gasket of claim 5 , wherein the anti-rust material is present in the gasket by being dispersed in a size at an angstrom (Å) level.

8. The gasket of claim 5 , wherein the rust inhibitor is in a form of a pellet.

9. A secondary battery comprising:

an electrode assembly including a positive electrode and a negative electrode;

a can including a top opening;

a cap assembly coupled to the can, wherein a portion of the top opening is bent inward to form the crimping part; and

the gasket for a secondary battery of claim 5 , wherein the gasket for a secondary battery is interposed between the can and the cap assembly.