Foam material on the basis on phenolic resin

摘要

The invention relates to a foam material on the basis of phenolic resin and to the use thereof. In order to provide a bio-based, thermosetting foam material with improved properties, in particular improved flame retardant properties, in essentially unchanged foam material properties, a foam material is proposed that is produced by at least the following steps: a) producing a prepolymer by condensation of at least one phenolic compound and formaldehyde in a ratio of 1 : 1.0 to 1 : 3.0 using 0.15 to 5 weight percent related to the amount of the raw materials used of an alkaline catalyst in the temperature range of 50 to 100 ºC until the refractive index of the reaction mixture is 1.4990 to 1.5020 and subsequently b) adding 2 to 40 weight percent related to the amount of the raw materials used of at least one natural polyphenol at a temperature of 50 to 100 ºC, c) adding 2 to 10 weight percent related to the amount of the raw materials used of one or more emulsifiers and mixtures thereof, d) adding 2 to 10 weight percent related to the amount of the raw materials used of one or more foaming agents and mixtures thereof and e) adding 10 to 20 weight percent related to the amount of the raw materials used of a curing agent and f) curing.