Solvent Based PU Adhesives – Problems with bubbles ?

Author: Saul Edwards

September 19, 2021

A common topic associated with the production of solvent-based PU Adhesives, is the issue of carbon dioxide bubbles, which can form within the polymer. These bubbles look unsightly, and they also lower the mechanical strength of the adhesive, because they act as a pathway of weakness within the cured glue.

To solve this problem, manufacturers of solvent-based PU adhesives typically use a Zeolite Powder such as 3A SUPERSIV, to absorb the excess water that may be present in the Isocyanante, Polyol or filler components. Once the water has been removed, the remaining raw materials will react together, to create a bubble-free 2KPU adhesive.

For those manufacturers who do not have the processing machinery required for the dispersion of fine powders into liquids, there is also a convenience product available called 3A SUPERSIV Paste. This is a pre-blended viscose liquid, that manufacturers can simply pour-in to their formulation. It is easy to handle, and it mixes into polymers very well. If you would like to know more about this paste, then please click here.

To receive a free sample of Molecular Sieve Powder click on the link here, and for a free sample of Molecular Sieve Paste, click on the link here

For further information about this topic or any other ancillary topic, then please click on the Expert Advisor button below, and one of our team will be very happy to help you !

Alternatively, for further reading then please click one of the topics listed below:
– Zeolite 3A for sale
– Polyurethane finish problems
– Molecular Sieve 3A

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