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Wednesday, 12 December 2018
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Raw materials & technologies, Raw materials

Monitoring the curing process of fairing compounds based on epoxy resins

Tuesday, 11 September 2018

In a recently published paper, scientists investigated the curing process of an innovative formulation as a function of temperature and humidity.

To fill superficial imperfections and protect the hull of yachts and ships, epoxy resins, heavily loaded with fillers, are used. Source: philipus – Fotolia.com.
To fill superficial imperfections and protect the hull of yachts and ships, epoxy resins, heavily loaded with fillers, are used. Source: philipus –...

Epoxy resins, heavily loaded with fillers, are used as fairing compounds in coating systems to fill superficial imperfections and protect the hull of yachts and ships; they are complex composite materials whose final performance can be heavily affected by the conditions of application. In a new paper the curing process of an innovative formulation was studied in function of the temperature and humidity, in order to evaluate how these environmental parameters influence the reaction evolution and gain further insight into the reaction mechanism.

Maximum degree of curing within one week

The study of the curing process was carried out by thermogravimetric analysis, differential calorimetric analysis and FT-IR spectroscopy. From the thermal analysis the obtained crosslink degree ranged between 92 and 99%, at 10 °C and 25 °C respectively. The samples cured at 25 °C reached the maximum curing degree in one week independently from the humidity. The samples cured at lower temperature (10 °C), even after two weeks, did not reach the complete crosslinking.

Changes in the bands

On the other side, it was evident that the humidity did not influence the curing at 25 °C, while it had a slight effect at lower temperature (10 °C). Results from FTIR spectroscopy at 25 °C evidenced changes in the bands characterising the two components of the resin during the curing reaction, in particular the disappearance of the oxirane ring band.

The study is published in: Progress in Organic Coatings Volume 123, October 2018, Pages 20-26.

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