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Sunday, 15 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Coating properties of acrylated soybean oil modified epoxy resins

Wednesday, 1 June 2016

In a study by Turkish researchers, acrylated soybean oil (AESO) was used as a modifying agent for DGEBA-type epoxy resin (ER).

Epoxy resin was modified with biobased acrylated epoxdized soybean oil (AESO). Benjamin Klack/pixelio.de

Epoxy resin was modified with biobased acrylated epoxdized soybean oil (AESO). Benjamin Klack/pixelio.de

The structure of modified epoxy resins (M-ERs) cured with various hardeners (SAc-sebacic acid, MNA-methyl nadic anhydride, PhA-phthalic anhydride, MA-maleic anhydride, SA-succinic anhydride, cycloaliphatic polyamine Epamine PC 17, MXDA-m-xylenediamine, MI-2-methylimidazole and polyamide type Crayamid) were characterised by Fourier transform infrared spectroscopy (FTIR).

Determining the microstructures

Atomic force microscopy (AFM) and SEM were used to determine the microstructures of some M-ERs. DSC test was conducted to study the effects of hardners on the Tg of the M-ERs. The influence of the modifying agent and hardeners on the curing process was studied through FTIR spectroscopy, and the curing degrees of M-ERs were determined to be over 94%. To investigate the effects of the curing agents, a comparative study was also performed on the mechanical properties of neat ER, such as the tensile strength and hardness.

M-ERs: Highly resistant to acidic corrosive media

Comparison between the mechanical properties of the epoxy systems demonstrated that the neat ER system had a higher tensile strength and e-modulus than that of M-ERs, which is in contrast to the elongation at break. Higher tensile strength values of 58 MPa and 53 MPa were observed for M-ERs cured with MNA and MXDA curing agents, respectively. A comprehensive study of the mechanical and water sorption properties of M-ERs illustrated that for an epoxy system modified with AESO in 50 wt%, MNA and MXDA were a more effective hardeners. Coatings obtained from M-ERs cured with anhydride type hardeners were determined to be highly resistant to acidic corrosive media.

The study is published in: Progress in Organic Coatings, Volume 97, August 2016, Pages 53–64

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