Sika Technology Ag

Christoph Mayer

Steffen Kelch

Ulrich Gerber

Tobias Meier

David Vazquez

A two-component epoxy resin composition includes a first component K1 including at least one epoxy resin A that contains on average more than one epoxy group per molecule; and a second component K2 including a hardener B for epoxy resins; wherein the two-component epoxy resin composition contains between 2 and 35 wt.-%, based on the total weight of the composition, of at least one impact modifier I in either one or both of components K1 and K2; wherein the impact modifier I is a reaction product of at least one polymeric diol, at least one polyisocyanate, and cardanol. The two-component epoxy resin composition exhibits excellent toughness and impact peel strength.

Toughened two-component epoxy composition

An epoxy resin adhesive including at least one epoxy resin in the resin component, at least one adduct AD including primary amino groups which is free-flowing at room temperature and is formed from (i) at least one polyepoxide and (ii) at least one amine of the formula (I) and optionally further amines, and additionally at least one accelerator B having at least one dimethylamino group in the hardener component, and a total of at least 50% by weight of at least one inorganic filler. The epoxy resin adhesive has low odor and good processibility, rapidly builds up strength at room temperature and under cold conditions and, after curing, has high strengths, especially particularly high compressive strengths, and high bonding forces to substrates such as steel, carbon fiber composites (CRP) and concrete.

Epoxy resin adhesive with high compressive strength

A method for strengthening metal structure, including steps: i) mixing two-component epoxy resin composition; ii) applying composition to metal structure surface, or onto strengthening element, or both; iii) contacting applied epoxy resin composition with strengthening element surface and/or metal structure surface wherein composition forms interlayer between metal structure and strengthening element, and iv) curing epoxy resin composition at 100&#xb0; C. or below; wherein two-component epoxy resin composition contains: first component between 10-50 wt.-% of at least one epoxy resin contains on average more than one epoxy group per molecule; second component between 5-30 wt.-% of hardener for epoxy resins; between 3-25 wt.-% of at least one impact strength modifier in one or both components; between 15-80 wt.-% of at least one filler in one or both components; and wherein two-component epoxy resin composition exhibits after curing Elastic Modulus at least 2500 MPa, and Impact Peel Strength at least 15 N/mm.

Growing community of inventors

Feusisberg, Switzerland

Christoph Mayer