Oxazolidines: An Effective Latent Curing Agent

The latent curing agent is meant for use in a huge range of coatings, adhesives, and sealant applications. They are found to be extremely beneficial in situations that require high build properties. For example, waterproof coatings and construction sealants. Oxazolidines are primarily used as latent curing agents and can be used in both one and two component PU systems.

If there is one component PU system, these latent curing agents are normally used with aliphatic prepolymers. They improve fast through-cure with making no space carbon dioxide gas evolution. On being exposed to moisture, these agents get hydrolysed, resulting into reactive amine and hydroxyl functional groups.

The unmatched properties of this latent curing agent is primarily determined by the curing mechanism, which is completely different from the traditional “moisture cure” reaction. During this process, moisture reacts directly with the terminal isocyanate of the prepolymer producing gaseous carbon dioxide. It results in blisters and bubbles in the coating film.

Moisture majorly reacts with the oxazolidine rather than with the prepolymer’s terminal isocyanate groups. The basic process of hydrolysis and ring opening of the oxazolidine generates amine and hydroxyl groups. These amine and hydroxyl groups then subsequently react with the isocyanate of the prepolymer without the evolution of carbon dioxide gas.

Why you should go for Waterborne Epoxy Curing Agents

The waterborne epoxy curing agents are widely employed in order to soften and harden both liquid and solid epoxy resins, featuring tough, durable polymers. These agents work as an adhesive to damp concrete. They contain water vapor permeability.

Polyurethane Prepolymers are highly used in the production of coatings, sealants and adhesives. In such cases, curing takes place by making direct contact with atmospheric moisture to deliver rigid, resilient polymers with extraordinary durability. There are various applications of these waterborne Epoxy curing agents including sports & playground surfacing, rubber crumb binder, dust sealer for concrete, polyurethane sealants and polyurethane adhesives.

Some waterborne epoxy curing agents processes in a chemical reaction with the epoxy resign to yield a tough, durable coating. It leads to good stability and epoxy compatibility. It provides total compatibility with cement and calcium salts. Their typical applications include floor and wall coatings, anti-corrosive primers, self-leveling systems, high gloss coatings, clear lacquers, and epoxy floor screeds.

Epoxy Repair Mortars are waterborne reactive polyamine adducts with longer pot life and lower viscosity. It has full compatibility with cement and calcium salts. It is an ideal product for high temperature climates. The applications include floor and wall paints, hygiene coatings, epoxy cement mortars, concrete primers, gloss paints and green concrete coatings.