New emission-free defoamer for solvent-borne and solvent-free systems

New emission-free defoamer for solvent-borne and solvent-free systems

Monday, 14 June, 2021

Authors: Jaume Figueras (jaume.figueras@altana.com; +34 629 789 267) and Pilar Casas (pilar.casas@altana.com; +34 699 659 491) both from BYK-Chemie GmbH – BYK Marketing & Technical Service.

The elimination or reduction of emissions is one of the objectives in the formulation of floorings based on high or 100% solid epoxy and polyurethane systems. One of the challenges of these systems is ensuring the total elimination of trapped air. The absence of a solvent, the resulting high processing viscosity, and the high amount of fillers and pigments are some of the reasons why elimination of air in these systems is not easy.

BYK-1760, distributed by Comindex, destabilises the foam lamella until it breaks. The defoamer is a mixture of active substances (silicone and polymer) in a reactive diluent. The reaction of the carrier through its functional groups causes the defoamer to lose its mobility. BYK-1760 is a defoamer for emission-free and AgBB-compliant systems.

Figure 1: working mechanism of BYK-1760

Figure 2: BYK-1760 does not produce slip

The fact that the carrier of the defoamer is incorporated into the polymeric matrix means that this defoamer exhibits lower migration than other defoamers. In addition, it does not produce slip, which is an undesirable property in floorings.

BYK-1760 has been formulated to obtain a good balance between compatibility and efficiency. The additive does not cause opacity or cratering. Furthermore, it is compatible with pigmented and transparent systems (both matt and gloss), and is very easy to incorporate during grinding, finishing and even in post-addition.

Figure 3: Excellent defoaming power and no formation of veil in solvent-free systems

Figure 4: Excellent defoaming power in two component polyurethane systems for flooring applied by roller

In summary, the new BYK-1760 defoamer is ideal for solvent-borne and solvent-free epoxy, polyurethane and polyaspartic systems. The additive boasts a good balance between compatibility and efficiency. It does not cause opacity or cratering and it is easy to incorporate during grinding, completion and even post-addition.

For further information about these products, please contact our technical advisory team.

URL: www.byk.com

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