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[资源]
胶黏剂基础之12——冰点下固化的环氧树脂胶黏剂（英文版）
One of the distinct advantages of epoxy adhesives is that they can be cured at room temperature or even at lower temperatures. Epoxy adhesives are often divided into room temperature curing types and elevated temperature curing types.
Once mixed, the two-part room temperature curing epoxy adhesives are designed to react at ambient conditions and temperatures near room temperature (20°- 25°C) or lower. However, in many cases the cure time may be accelerated with heat, but this is not a requirement. Once mixed, the crosslinking reaction begins immediately, and the resulting working life is limited. The cure rate and working life will be dependent on the specific formulation as well as the ambient temperature. Although the adhesive will harden to a handling strength in usually a short period of time, it will continue to develop strength for a much longer period.
Depending on the type of curing agent chosen, epoxy adhesive systems can reach full strength in minutes to several days. The most common types of epoxy adhesives will reach handling strength in several hours and full cure in five to seven days. The faster curing agents can reach handling strength in as little as five minutes at room temperature. These fast cure formulations also provide practical cure times at low temperatures and they are well suited for outdoor application in winter. |
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