Room temperature curing epoxy adhesives, with their time-saving, convenient, efficient, energy-saving and environmentally friendly characteristics, have found wide applications in many fields such as aerospace, precision machinery and electronics industries, rapid repair of civil buildings, reinforcement and restoration of bridges and dams, maintenance of agricultural machinery, cultural relics conservation, and bonding in wet environments. For this reason, it has developed rapidly and has a large output, becoming a prominent member in the epoxy adhesive family. Experts usually classify room temperature curing epoxy adhesives into two categories: ordinary type and special type. The latter includes rapid curing adhesives, ultraviolet (UV) curing adhesives, etc.
         The characteristics of room temperature curing epoxy adhesives are summarized as follows:
It can cure at room temperature without external heating, simplifying the curing process and being easy to operate. It eliminates the need for vulcanization equipment, achieves energy conservation and emission reduction, and reduces costs.
This type of adhesive has relatively high bonding strength, heat resistance, corrosion resistance and electrical properties, although these properties are generally not as good as those of adhesives made with medium and high temperature curing agents. In particular, its thermal resistance decreases significantly with increasing temperature, and the long-term use temperature is generally limited to below 80 °C.
         At room temperature, its pot life is relatively short.
         The curing process usually takes 24 hours to reach the basic strength and 3 to 7 days to reach the maximum strength, and the specific time is affected by the environmental temperature.
Due to its low cost, convenient use and wide applicable room temperature range, room temperature curing epoxy adhesives have a wide range of application fields, a large market demand and a wide variety of types.
         The following points should be noted when using room temperature curing epoxy adhesives:
The curing process must be carried out at room temperature (15 - 40 °C).
In order to achieve high strength, heat resistance and good use effect, appropriate techniques need to be combined.
For general epoxy adhesives, cost control strategies should be considered.
During the room temperature curing process, it is necessary to ensure that the adhesive maintains specific properties. For example, structural adhesives should enhance bonding strength and durability; rapid curing adhesives need to further improve their reactivity.