Patent DE-102008013847-A1 (DE)
Title: Insulation material for complete/partial absorption of oscillation, comprises a foam material, which is produced from organic/inorganic polymers and is available with open or closed cells distributed over its total mass, and a particle
Inventor: WACKER THOMAS
IPC: G10K11/162
Filed: 2008-03-12
Abstract: The insulation material (1) comprises a foam material (2) and a particle (3) with a specific density of 3.0-6.5 g/cm 3>. The foam material is foamed plastic produced from organic or inorganic polymers. The foam material is available with open or closed cells distributed over its total mass according to DIN7726. The total density is lower than the structural substances, which comprises foam plastic, elastic foam plastic, elastomeric foam material, thermoelastic foam material, softelastic foam material, fiber reinforced foam plastic, polyurethane foam material, and polystyrene foam material. The insulation material (1) comprises a foam material (2) and a particle (3) with a specific density of 3.0-6.5 g/cm 3>. The foam material is foamed plastic produced from organic or inorganic polymers. The foam material is available with open or closed cells distributed over its total mass according to DIN7726. The total density is lower than the structural substances, which comprises foam plastic, elastic foam plastic, elastomeric foam material, thermoelastic foam material, softelastic foam material, fiber reinforced foam plastic, polyurethane foam material, polystyrene foam material, polyvinyl chloride foam material, foam rubber, sponge rubber, vulcanized latex-foam on the basis of natural or synthetic rubber, open-pored, foam with open cellular pore structure, foam with closed cellular pore structure, closed pore-foam, mixed cellular foam material, coarse cellular foam material, fine cellular foam material, high-resilient foam or integral foam, structural foam with strong shell and cellular core or synthetic foam material. The foam material has an energy elasticity and/or entropy elasticity and has no permanent shaping of more than 2% of its exit volume during the pressure deformation according to DIN 53580 up to 50% of its thickness. The foam material has a tensile strength of 50-100 kPa, is producible with or without propellant or gas lining through air or carbon dioxide and is formed in open-celled manner. The foam comprises pores (4) arranged in sequential and interlocking manner and the surface of the insulation material has through-connecting channels (5). The diameter of the open-cellular pore and/or the channels is 0.3-1.1 mm. The volume of the pores and the channels with regard to the total volume of the insulation material is 40-95%. The insulation material is available through mixing the particles with components of non-foamed foam material, mixing the components of the foam material in a mixing low-pressure process or in a forcing high pressure method, introducing the foam material components mixed with one another and the particles contained in the foam material components in a closed or opened foam tool for producing a form part or a plate-shaped or block-shaped ware and demolding the insulation material workpiece after the hardening. The size of the particle is 0.2-70 mm. The particles are in form of powder, granulate, flour or fiber and are fine-grained or coarse-grained and are solid or fluid. The surface of the particle is angular, tetrahedron, prism shaped or polyhedrically shaped. The weight portion of the particle in related to the weight of the components of the unfoamed foam material is 70-150 wt.%. The foam material is selected so that it partially or completely absorbs high sound frequency of 1000-1600 Hertz, during the particles are selected so that it completely or partially absorbs deep frequency of 1-999 Hertz. The thick or wall strength of the insulation material is 0.3-50.0 cm. The insulation material has the form of tube, hose, box, sachet, ventilation duct, air channel, film, foil, coating, coat, adhesive layer, block ware for further processing, a plate or slab and is formed in single- or multilayered manner. The degree of absorption of oscillation in the frequency range of 1-16000 Hertz in frequency dependent or frequency independent manner is 20-80% related to the sound pressure level to be insulated.