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Application filed by Universitatea Tehnică Din Cluj-NapocafiledCriticalUniversitatea Tehnică Din Cluj-Napoca
Priority to ROA201300336ApriorityCriticalpatent/RO129228A8/en
Publication of RO129228A0publicationCriticalpatent/RO129228A0/en
Publication of RO129228B1publicationCriticalpatent/RO129228B1/en
Publication of RO129228A8publicationCriticalpatent/RO129228A8/en
The invention relates to a soundproofing composite material and a process for preparing the same. The claimed material comprises 70...80% fir sawdust grains having a humidity of 9.3...10.4% and a density of 0.035...0.039 g/cmand 20...30% polyurethane foam, the percentage being expressed by weight. The claimed process consists in vigorously mixing the polyol and isocyanate components in a ratio of 100:70 for 5...8 s, at the room temperature, afterwards adding fir or beech sawdust grains, the resulting mixture is poured into a mould and it is maintained for 30...45 min for the reaction completion, to result in a material having a density of 0.14...0.17 g/cm, a compressive strength of 0.03...0.07 N/mm, a thermal conductivity of 0.039...0.083 W/m.K and an acoustical absorption coefficient α within the range 0.55...0.95 in the frequency range of 1000...6300 Hz.
ROA201300336A2013-04-302013-04-30Process for preparing a soundproofing composite material
RO129228A8
(en)
Expandable granular composite material, composite foam for thermal insulation and the methods for production of expandable granular composite materials
Foam expansion agent compositions containing z-1,1,1,4,4,4-hexafluoro-2-butene and their uses in the preparation of polyurethane and polyisocyanurate polymer foams
Foam-forming compositions containing mixtures of cis-1,1,1,4,4,4-hexafluoro-2-butene and 1,1,1,3,3-pentafluoropro pane and their uses in the preparation of polyisocyanate-based foams.