Abstract
Chemical modification of Schiff base epoxy resins involves introduction of waste PET degradation products into a synthesis reaction between N,N’-bis(2-hydroxybenzylidene)-4,4’-oxydianiline and epichlorohydrin or introduction of a flexibility spacer between the mesogenic units in a reaction with epichlorohydrin. This provides the resins with much lower glass transition temperatures. All used Schiff bases are the derivatives of 2-hydroxybenzaldehyde. Synthesized epoxy resins were used as a component of binder of new organic coatings. Xylene-based solution of polyamide based on dimerized fatty acid and polyamines and poly(oxypropylene diamine) were used as a hardener for the synthesized and commercial epoxy resins at room temperatures. Physical and mechanical properties of coatings based on new epoxy resins were determined. Results were compared with those for one selected commercial epoxy resin. The results of investigations prove that coatings based on new epoxy resins have good elasticity, impact resistance, and their adhesion to the substrate is comparable or even better than that of coatings based on the widely used commercial epoxy resin.
Highlights
Epoxy resins have been the subject of numerous patents, papers, and publications ever since their industrial debut around 1947.1 Today, these epoxy resins are commonly found in industry and in everyday life as two-component adhesives, coatings, paints, and composite materials with a curing agent.[2]
We report on two methods for the modification of Schiff base epoxy resin in order to obtain flexible, organic coatings with very good physical and mechanical properties
The second one involves the introduction of waste poly(ethylene terephthalate) (PET) degradation products into a synthesis reaction between N,N’-bis(2-hydroxybenzylidene)-4,4’-oxydianiline and epichlorohydrin
Summary
Epoxy resins have been the subject of numerous patents, papers, and publications ever since their industrial debut around 1947.1 Today, these epoxy resins are commonly found in industry and in everyday life as two-component adhesives, coatings, paints, and composite materials with a curing agent.[2]. Epoxy resins based on Schiff base derivatives seem to constitute a promising replacement They display good chemical resistance and mechanical properties. We report on two methods for the modification of Schiff base epoxy resin in order to obtain flexible, organic coatings with very good physical and mechanical properties. The second one involves the introduction of waste PET degradation products into a synthesis reaction between N,N’-bis(2-hydroxybenzylidene)-4,4’-oxydianiline and epichlorohydrin. These modifications have made it possible to obtain resins with lower glass transition temperatures ranging from À 9°C to as low as À 33°C. The resistance of the coatings to bending was determined according to the standard EN ISO 6860 Paints and varnishes—Bend test (conical mandrel). Hardness was determined according to the standard EN ISO 1522—Paints and varnishes—Pendulum damping test
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