26 августа, 2015 
Pokraskin The typical maximum operating temperature of a standard ethyl cyanoacrylate is 85 °C to 100 °C and the bond strength can fall rapidly after 100 °C (Figure 1.6).
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Figure 1.6 Hot strength of a standard ethyl cyanoacrylate — measured on steel lap shears |
Allyl based cyanoacrylates were developed to improve the hot strength but these products required a secondary heat cure and parts to be clamped during the heat cycle to allow the allyl group to fully crosslink. Other cyanoacrylates with additives (such as phthalic anhydrides) have been formulated and these products do provide improved long-term strength at 120 °C.
For the cyanoacrylate with the high-temperature additives, the data are presented slightly differently as the adhesive gains hot strength as it is aged at temperature [1]. However, it can be seen (Figure 1.7) that there is still a 50% improvement in the performance.
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Hours Figure 1.7 Heat ageing strength curve for a cyanoacrylate with high-temperature additives |
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