Process for preparing phenolic resin foams with improved heat insulating properties

摘要

Phenolic resin foams for use as insulating medium from aqueous phenolic resoles, blowing agents, acids as a curing agent and optionally conventional additives obtained by additives from the group of mono- and disaccharides, the degradation products, hydrolysates and hydrogenation of polysaccharides, sugar alcohols and the Ascor ascorbic a substantially increased closed cells, and in particular an increased specific thermal insulation and reduced thermal conductivity λ. The prerequisite is the use of resins sufficient reactivity as well as a sufficient amount of hardeners.