Polyamide resin composition for sound insulation

Abstract

Disclosed is a polyamide resin composition for sound insulation, which includes a polyamide 66 or polyamide 6 resin, a glass fiber for improving mechanical and heat resistance properties of the composition, and barium sulfate for improving a sound insulation property of the composition. The polyamide resin composition can further include one or more of an antioxidant for preventing deterioration of the composition, a heat resistant stabilizer for improving heat resistance, and a lubricant for reducing friction to improve moldability. The polyamide resin composition thus has excellent mechanical properties, heat resistance, noise and vibration insulation performance, and can further be injection molded to thereby provide weight reduction and allow for the formation of complicated shapes.

1 . A polyamide resin composition for sound insulation comprising:
 about 15 to 20 parts by weight of a glass fiber, based on 100 parts by weight of polyamide 6.6 or polyamide 6,   about 45 to 50 parts by weight of barium sulfate, based on 100 parts by weight of the polyamide 6.6 or polyamide 6 resin, and   one or more of about 0.3 to 0.5 parts by weight of an antioxidant, about 0.3 to 0.5 parts by weight of a heat resistant stabilizer, or about 0.2 to 0.4 parts by weight of a lubricant, based on 100 parts by weight of the polyamide 6.6 or polyamide 6,   wherein an average length of the glass fiber is about 1 mm to 5 mm,   wherein an average diameter of a cross section of the glass fiber is about 10 to 13 μm,   wherein the glass fiber is coated with a silane-based coupling agent,   wherein a weight of the silane-based coupling agent is about 0.1 to 0.3 wt % based on a total weight of the glass fiber,   wherein an average diameter of particles of the barium sulfate is about 20 to 30 μm.   
     
     
         2 - 7 . (canceled) 
     
     
         8 . The polyamide resin composition for sound insulation according to  claim 1 , the antioxidant comprises a mixture of a phenol-based antioxidant and a phosphite-based antioxidant.