FIELD: chemistry.
SUBSTANCE: invention relates to foamed granular composite materials based on vinyl aromatic polymers, having improved heat-insulation properties, and a method for production thereof (versions). The composite material has density of less than 40 g/l with content of closed pores of less than 60%. The material is also characterised by presence of heterophase areas consisting of materials which are partially miscible with the polymer matrix and/or cavities which are embedded inside the polymer matrix. Said cavities are gas and/or liquid cavities which mainly consist of a foaming system, and inside said heterophase areas there a non-uniformly distributed graphite material with degree of graphitisation, calculated using a Meyer-Mering formula, of at least 0.2. The polymer matrix is a synthetic thermoplastic polymer containing at least 60 wt % of the matrix with respect to total weight of a polymer obtained from a vinyl aromatic monomer. The disclosed granular materials enable to obtain foamed articles with low density, having high insulating capacity with minimum thickness of the panel and with cost comparable to commercially available products. The foamed articles satisfy self-extinction technical requirements of the B2 test according to specification DIN 4102 part 2, with reduced use of self-extinguishing filler materials.
EFFECT: improved heat-insulation properties.
33 cl, 11 dwg, 6 tbl, 39 ex
