LAMINATED ACOUSTIC MATERIAL Russian patent published in 2007 - IPC B32B5/24 B32B7/02 G10K11/168 B32B27/38 B32B27/42 B60R13/08 B64C1/38 D04H3/12 E04B1/82 

FIELD: manufacture of laminated acoustic materials used in aeronautical engineering and automobile industry; manufacture of safety and sound-absorbing shields for automobile roads.

SUBSTANCE: proposed material includes layer made from non-woven needle-piercing material manufactured from polyoxadiazole or polyimidic fibers impregnated with binder of the following composition, mass-%: phenylmethyl polysiloxane, 87.6-95.0; polyorganoelemnto silazane, 3.6-3.9; tetrabromodiphenyl propane, 8.8-9.6 and layer of cellular structure which is made in form of honeycomb panel on base of glass or aramide fabric impregnated with phenolformaldehyde or polyimidic resin. Non-woven material and binder are used at the following ratio, mass-%: non-woven material, 25-52; binder, 48-75. Ratio of thickness of acoustic material layers is equal to 1: (1-2). Material possesses high and stable magnitudes of sound-absorbing coefficients of about 0.8-0.99 in wide frequency range (1.25-6 kHz).

EFFECT: enhanced efficiency.

3 cl, 1 tbl, 4 ex