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Toughener definition
Jul 04, 2017

Toughening Agent Definition

The toughening agent (Toughener) is a substance that can increase the flexibility of the adhesive film layer. Certain thermosetting resin adhesives, such as epoxy resin, phenolic resin and unsaturated polyester resin adhesives after curing the elongation rate is low, the brittleness is larger, when the bonding site under external pressure is very easy to produce cracks, and rapid expansion, resulting in adhesive layer cracking, fatigue resistance, can not be used as structural bonding. Therefore, we must try to reduce brittleness, increase toughness and increase the bearing strength. Any substance that reduces brittleness and increases toughness without affecting other major properties of the adhesive is called toughening agent.