Oxazolidines as Moisture Scavengers and an excellent reactive diluent

Oxazolidines as Moisture Scavengers and an excellent reactive diluent

With the continuous advancements in technologies, there has been a considerable effect on the solvent-borne industrial coatings market. In the past few years, there has been various enhancements emerged out in water based coatings technology, which has not reached from consumer home paint market to industrial applications. In the addition, the strict VOC regulations have led to the evolution of a more viable water based alternative to solvent based technology. There are few restrictions exists even today particularly with the key properties of chemical and abrasion resistance in coatings performance.

This advanced technology has not only affected the water based technology but also the segment of high solids coatings. The recent advancements are usually implemented with lower molecular weight components to attain the least permissible viscosity with the minimum use of solvent. Therefore, there exists a point limit to molecular weight reduction, as it can reach to issues association with the loss of coating performance. For example, the 2-pack polyurethane coatings market has witnessed this change. Generally, these systems are made of an acrylic polyol and an HDI-based polyisocyanate. These form polyurethanes containing unmatched performance qualities include excellent chemical resistance as well. There is the only solution to maintain the coating benefits of solvent systems, whilst reducing the VOC, is to include a reactive diluent.

The existence of water in one-component moisture heals polyurethanes leads to bad in-can stability. In the same manner, moisture in isocyanates leads to the production of CO2 which dissolves in the product and can subsequently cause foaming when the container is opened. In more acute cases, containers may start to bulge and lids burst as a result of high vapour pressure.

Incozol is considered as a low viscosity bi-oxazolidine reactive diluent developed as a co-reactant in polyurethane coatings to attain low VOC. It is made of two oxazolidine rings joined by a carbonate bridge, which ensures low viscosity by restricting intermolecular hydrogen bonding.

There are various benefits of a reactive diluent. It offers good polyol and solvent compatibility. It contains low intrinsic viscosity 50 mPas@20C. It has considerably high equivalent weight. It is of low color which is important for clear lacquer finishing. There is no side effect on the coating properties including film hardness development and resistance, gloss and weathering properties. The applications include low VOC paints and varnishes, high build paints and elastomers.

Founded in 1986, Incorez Ltd has rapidly gained prominence as a specialist manufacturer of oxazolidines, waterborne epoxy curing agents, reactive diluent including moisture scavengers, and waterborne polyurethane dispersions.

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