Effects of some chemical components of polyurethane sealants on their resistance against hot water


The hot water resistance of polyurethane sealants of various compositions was investigated. Cast and cured samples were assessed by measurements of: water swelling resistance; compression recovery; extension-compression fatigue resistance; and by hand peel tests from concrete substrates. The influences of polyol composition, fillers, antioxidants and adhesion promoters were studied. The sealants prepared using a hydrophobic polyol exhibited superior hot water resistance to those containing polypropylene glycol. Compromises between adhesion, cohesion, water swelling and thermal oxidation are discussed. 13 refs.

Primary author(s): Chew M Y L

Source: Build.Environ.

             Vol.38, No.12, 2003, p.1381-1384




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