Application of new modified Schiff base epoxy resins as organic coatings

Abstract

Chemical modification of Schiff base epoxy resins involves introduction of waste PET degradation products into a synthesis reaction between N,N'-bis(2hydroxybenzylidene)-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.

Modified resol type phenolic resin nanocomposites as surface metal coatings

“…This is due to the presence of polar epoxy and hydroxyl groups in epoxy resins which increase the adhesion characteristic of resol resin. [29] Also, modified resol resin with epoxy exhibits higher scratch hardness values as compared with those modified with epoxy/urethane. This is attributed to the etherification reaction between methylol group in resol resin and hydroxyl group in epoxy resin, which, in turn leads to network structure formation.…”

Modified Epoxy for Fibre Reinforced Polymer Strengthening of Concrete Structures

“…To achieve environmental sustainability, a renewable resource to substitute existing epoxy such as bio-based epoxy has been studied in recent years such as vegetable oil, sucrose and lignin [81]- [84]. These materials are highly available, safe and do not create harm to humans and animals.…”

Flame retardants for epoxy resins: Application‐related challenges and solutions

“…Since then a number of epoxy resins have been developed, which can be cured (crosslinked) with a number of curing agents. Owing to their high versatility, low cost, high adhesiveness to many substrates, good heat and chemical resistances, and excellent mechanical properties, epoxy resins are used in a wide range of applications ranging from low to high end in terms of performance, including as: adhesives [3,4] ; protective and decorative coatings [5][6][7] ; encapsulants and circuit boards in electronics [8][9][10] ; components in biomedical systems [11,12] ; and structural materials, that is, as composites in construction [13,14] automotive [15,16] and aerospace [17,18] applications. However, in terms of their consumption, the trend is opposite to that above as shown in Figure 1, that is, the lower performing ones being consumed to a greater extent.…”