Styrene-acrylic emulsions: elasticity, strength and ecology

Recently the main paint manufacturers are increasingly specializing in environmentally friendly products.

Frequently, we hear about indoor emissions or certifications such as EMICODE, Blue Angel (RAL UZ 113), AgBB, and others. Even the institutions do their part to push the paint world towards more eco-friendly products.

Icap-Sira has been developing for years new acrylic and styrene-acrylic emulsions based on surfactant technologies different from APEO ones.

In particular, 2 semi-elastomeric styrene acrylic resins with low glass transition temperature (Tg) and low minimum filming temperature (MFFT) have been developed: Acrilem® ST186 contains ammonia and is therefore suitable for all outdoor applications and Acrilem® ST187, ammonia and formaldehyde free, is suitable for all those indoor applications where it is important to ensure excellent air quality.
In the transition from the APEO-containing resin to the new version without these kind of surfactants, a new polymerization technology that involves the use of adhesion promoters inserted inside the polymer chain has been introduced.

This new technology greatly improves the cross-linking and hydrophobicity of polymers. In addition, it provides the paints with exceptional adhesion on mineral substrates, accompanied by water and wet abrasion resistance.

The inclusion of adhesion promoters guarantees a higher cross-linking level improving the mechanical properties and resistance to abrasion without compromising elasticity: the elongations at break, in fact, are in line with the other products.