A method for the production of PU and PIR construction boards has been patented by Holcim. The boards are blown using a blowing agent additive, such as an aldehyde, ketone, or ester, and at least 75% isopentane.
Their objective was to develop isocyanate-based foam construction boards that possessed superior insulating and physical properties while maintaining the thickness of the boards. Additionally, they sought to guarantee that the boards' insulating properties would endure for an extended period.
The patent asserts that the polyol, isocyanate, isopentane, and blowing agent additive can be combined in a variety of ways to produce a foam-forming mixture. Subsequently, this is deposited on a facer and heated to generate a closed-cell foam. The blowing agent additive is essential to its success.
Previously, they stated that the production of construction boards was significantly impeded by the extreme difficulty of processing higher levels of isopentane. However, they discovered that the addition of a blowing agent additive to the mixture enabled them to maintain processability while increasing the percentage of isopentane. Consequently, they stated that it is feasible to fabricate construction boards that exhibit superior insulating properties and greater dimensional stability.
The company stated that boards produced in this manner have the potential to be used in both roofing and wall applications, including low-slope and flat roofing systems. They are compatible with and without water-protective membranes.
Source: Urethane Technologies International
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