Polyolefin composition, sound insulation material and preparation method thereof

The invention provides a polyolefin composition which comprises a polyolefin component and an elastomer component, optionally a filler and an additive. The invention also provides a composite material in a multi-layer structure, wherein the multi-layer structure is formed by alternating layers which are respectively formed by A and B materials, at least one of the A and B materials is the polyolefin composition, and the compositions of the A and B materials are the same or different. A preparation method of the composite sound insulation material is also provided, and two different layers are made of the A and B materials and furthermore form the alternating multi-layer structure. The invention also provides a use of the composite material in sound insulation in the range of 100-2500 Hz.