Synthesis of Polyurethane/Epoxy Hybrid Resin used for Damper of Loudspeaker

스피커용 댐퍼에 사용되는 폴리우레탄/에폭시 하이브리드 수지의 합성

  • Received : 2016.02.15
  • Accepted : 2016.03.24
  • Published : 2016.03.27


As a coating material for loudspeaker dampers, resilient polyurethane/epoxy hybrid resins were synthesized to replace conventional phenol resin and examined the physical properties, which are not only environmentally friendly but also not harmful to human. Five types of polyurethane resins were synthesized in the step-shot method using methylene diisocyanate, three polyols such as poly tetramethylene ether glycol(PTMEG, MW:2000), poly(1,4-buthylene adipate(PBAP, MW:2000), and poly carbonatediol(PCD, MW:2000), and three chain extenders such as ethylene glycol(EG), neopentyl glycol(NPG), and 1,4-buthandiol(1,4-BD). The five types of synthesized polyurethane resins and commercially available bisphenol A type epoxy resin were blended in weight ratios of 90:10, 70:30, and 50:50 to synthesize 15 types of polyurethane/epoxy hybrid resins. Among the polyurethane resins, the one that was synthesized using PCD and 1,4-BD showed excellent tensile strength, 100% modulus, low extension, and relatively high viscosity. Polyurethane/epoxy hybrid resins with higher epoxy resin contents showed better thermal properties and water resistance while those with higher polyurethane contents showed higher flexibility. The polyurethane/epoxy hybrid resin made by blending the polyurethane based on PCD and 1,4-BD with a bisphenol A type epoxy resin in a weight ratio of 70:30 was identified to be the most suitable to be used in speaker dampers.


Supported by : 산업통상자원부


  1. D. S. Choi and S. S. Lee, Experimental Analysis of the Damper of Loudspeaker, The Acoustical Society of Korea, 23(3), 192(2004).
  2. H. R. Yi, S. J. Oh, and S. W. Yoon, Radiation of the Damper of Loudspeaker, The Acoustical Society of Korea, 23(1), 127(2004).
  3. S. G. Choi andK. S. Yoo, AStudy on the Synthesis and Properties of Polyurethane Resin Based on PPG as a Glycol, Elastomer, 35(3), 205(2000).
  4. S. G. Kim, M. J. Li, M. T. Ramesan, and D. S. Lee, Effects of Polyol Types andHard SegmentContents on the Crystallization of Thermoplastic Polyurethanes, Polymer(Korea), 29(2), 140(2005).
  5. S. Y. Yang, H. A. Kim, and S. J. Kim, The Synthesis of One-step Type Hydrophilic Non-porous Polyurethane Resin and the Physical Property of its Coated Fabric for the Garment, Textile Coloration and Finishing, 23(2), 131(2011).
  6. J. Y. Kim, J. Y. Woo, M. H. Min, S. H. Yoon, and J. H. Yeum, Study of Dye EncapsulatedMicrocapsule Polymerization Using Polyurethane Prepolymer Synthesis and Textile Finishing, TextileColoration and Finishing, 27(3), 184(2015).
  7. D. K. Seo, N. H. Ha, J. H. Lee, H. G. Park, and J. S. Bae, Property Evaluation of Epoxy Resin based Aramid and Carbon Fiber Composite Materials, Textile Coloration and Finishing, 27(1), 11(2015).
  8. H. C. Kim, Study on the Compatibility of Brominated Epoxy Resin with Nylon 6 and the Characterization of the Blends, Textile Coloration and Finishing, 22(2), 155(2010).
  9. M. J. M. Abdrhman, L. Zhang, B. Zhou, andH. Li, Thermal Behavior of Nylon 6 and Bisphenol-A Polycarbonate Blends Compatibilized with an Epoxy Resin, Polymer(Korea), 32(6), 523(2008).
  10. S. J. Park, J. S. Jin, J. R. Lee, and P. K. Pak, Effect of Surface Free Energies on Mechanical Properties of Epoxy/Polyurethane Blend System, Polymer(Korea), 24(2), 245(2000).
  11. J. S. Kimand S. P. Hong, TheToughness of Polyurethane and Epoxy Resins IPNs, J. of Korean Ind. and Eng. Chemistry, 9(3), 445(1998).