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Enhancing wettability and water resistance of coatings using tung oleic acid-based gemini wetting agent via Fischer esterification
2024-10-14 08:50
Researchers found that the newly developed gemini-based wetting agent improves surface tension and water resistance.
As societal awareness of environmental concerns grows, there is a gradual transition towards more environmentally friendly aqueous products, replacing traditional solvent-based ones. However, owing to its short hydrophobic chain segment, polyether defoamer has limitations, including a narrow field of use, poor defoaming ability, and a low defoaming rate. This study employed Fischer esterification to graft tung oil acid (i.e., eleostearic acid) onto 2,5,8,11-tetramethyl-5-decyne-4,7-diol, ethoxylated (TDDE) using p-toluenesulfonic acid as a catalyst.
The resulting product, polyether alkynyl alcohol wetting agent (ETDDE), consisted of a tung oil monomer chain (hydrophobic part) and a polyether chain (hydrophilic part). The successful synthesis of ETDDE was confirmed through infrared spectroscopy analysis, gel permeation chromatography testing, and acid value determination. The results showed that the surface tension, defoaming ability, coating gloss, wettability, and water resistance of ETDDE improved with the ratio of eleostearic acid to TDDE.
Progress in Organic Coatings Volume 197, December 2024, 108779
source：european-coatings
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