A method for manufacturing rigid low-density polyisocyanurate bio-based foams filled with carbon fibers

摘要

The invention relates to a method for manufacturing rigid low-density polyisocyanurate bio-based foams (density ≤ 100 kg/m³) applicable in structural, machine building and domestic appliances industries and may be used in sandwich panels, for the thermal insulation (both heat and cold) of roofs, as well as surfaces, especially horizontal ones, in cryogenic fuel tankers, refrigerated vans, cold-storage warehouses, etc.;Technical problem to be solved by the invention is increasing of stiffness, i.e. elasticity moduli (both in tension and compression) of the obtained rigid low-density polyisocyanurate bio-based foams.;The proposed method for manufacturing rigid low-density polyisocyanurate bio-based foams filled with carbon fibers comprises the steps of: a) mixing a polyols' blend comprising biopolyols with catalysts, a surfactant and a flame retardant, b) adding organically modified nanoclays by means of ultrasonication, c) cooling down the polyols' blend, d) mixing carbon fibers, e) adding a blowing agent, f) mixing the obtained final polyols' composition and an isocyanate component and g) pouring the obtained liquid composition into a mould for a free rise.