Method for manufacturing soundproofing material using polyurethane foam from car seat foam and composition thereof prepared thereby

A method for preparing a soundproofing material, comprising:

• crushing a discarded car seat comprised of polyurethane (PU) foam finely into a size of about 2-3 mm;
• mixing the resulting crushed polyurethane (PU) foam with polyester fiber, low-melting temperature polyester fiber as a binder, polypropylene (PP) fiber, thermoplastic fiber and hemp;
• carding the resulting mixture;
• needle punching the carded material;
• thermoforming and cooling the needle punched material into a felt;
• and
• hot rolling and cutting the felt,
• wherein the low-melting temperature polyester fiber as a binder has a melting temperature of 130-180° C. and is included in an amount of 2-50 wt %, the polypropylene (PP) fiber is included in an amount of 20-25 wt%, and the hemp is included in an amount of 10-15 wt %.