Epoxy glues
Introduction
Definition of epoxy glues
Epoxy glues are thermosetting adhesives formed by the chemical reaction of epoxy resins with a hardening agent or catalyst. This type of adhesives is characterized by its high mechanical, chemical and thermal resistance, which makes them especially useful for joining materials in applications that require durability and rigidity.
In construction and industry, epoxy glues are widely used due to their ability to adhere to very diverse surfaces such as metal, wood, concrete, ceramics and plastics. In addition, its formulation allows for waterproof and resistant joints against humidity and chemical agents.
Composition and chemical properties
Basic components of epoxy glues
Epoxy glues are mainly made up of two components: the epoxy resin and the hardener or catalyst agent. Epoxy resin is a polymer that contains reactive epoxide groups, while the hardener can be an amine, anhydride or other compound that initiates polymerization.
When both components are mixed, a chemical curing reaction occurs that transforms the initial liquid mixture into a rigid and resistant solid. The proportion between resin and hardener must be precise to guarantee correct curing and the expected mechanical properties.
Physical and mechanical properties
Epoxy glues have excellent adhesion to multiple materials, high tensile and compression strength, and notable surface hardness. In addition, their chemical resistance makes them very durable against solvents, acids and bases.
Another important property is its low shrinkage during curing, which prevents the formation of internal stresses and cracks. They can also withstand elevated temperatures, typically between 120 and 150 degrees Celsius, although special formulations are available for more demanding environments.