CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/KR2018/005103 filed May 2, 2018, which claims priority from Korean Patent Application No. 10-2017-0056390 filed May 2, 2017, all of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a two-part adhesive composition exhibiting excellent lap shear strength and adhesive strength.

BACKGROUND OF ART

A two-part acrylic adhesive is used in fields such as those of automobiles, buildings, marine, wind power, and the like, because it can be cured at room temperature, adhered to a large area, quickly cured, and adhere to various plastics.

However, the two-part acrylic adhesive has disadvantages in that adhesive strength is lower than that of a one-part epoxy adhesive and elongation is lower than that of a urethane adhesive. As a result, it has been restricted in fields requiring stronger adhesive strength such as structural adhesives for vehicles, and higher elongation such as adhesion outside the vehicle.

In addition, there is a trade-off relationship between flexibility/toughness and strength in various adhesive compositions. In general, in order to increase flexibility and toughness in an adhesive composition, a rubbery polymer is added, but the addition of such rubbery polymer adversely affects the modulus and finally strength of the adhesive. Therefore, it is required to develop an adhesive composition exhibiting excellent adhesive strength without sacrificing strength.

