Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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The Effect of Zirconate Addition on the Joint Properties of Epoxy Adhesive for Car Body Assembly

차체 구조용 에폭시 접착제의 접합부 특성에 미치는 Zirconate 첨가효과

  • Jeung, Eun-Taek (Advanced Welding & Joining Technology Center, Micro-Joining Center, KITECH) ;
  • Lee, Hye-Rim (Advanced Welding & Joining Technology Center, Micro-Joining Center, KITECH) ;
  • Lee, So-Jeong (Advanced Welding & Joining Technology Center, Micro-Joining Center, KITECH) ;
  • Lim, Chang-Young (Technical Research Laboratories, Shinyoung Co., Ltd.) ;
  • Seo, Jong-Dock (Technical Research Laboratories, Shinyoung Co., Ltd.) ;
  • Kim, Mok-Soon (School of Materials Science & Engineering, Inha University) ;
  • Kim, Jun-Ki (Advanced Welding & Joining Technology Center, Micro-Joining Center, KITECH)
  • 정은택 (한국생산기술연구원 용접접합기술센터, 마이크로조이닝센터) ;
  • 이혜림 (한국생산기술연구원 용접접합기술센터, 마이크로조이닝센터) ;
  • 이소정 (한국생산기술연구원 용접접합기술센터, 마이크로조이닝센터) ;
  • 임창용 ((주)신영 기술연구소) ;
  • 서종덕 ((주)신영 기술연구소) ;
  • 김목순 (인하대학교 신소재공학과) ;
  • 김준기 (한국생산기술연구원 용접접합기술센터, 마이크로조이닝센터)
  • Received : 2013.10.14
  • Accepted : 2013.10.30
  • Published : 2013.10.31
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Abstract

The effect of zirconate having - NH functional group on the T-peel and lap shear strength of $CaCO_3$ containing structural epoxy adhesive for car body assembly was investigated. Curing behavior of epoxy adhesive samples were investigated by differential scanning calorimeter (DSC) techniques. The addition of zirconate up to 7.5 phr did not affect the curing mechanism of epoxy adhesive. While the small amount of zirconate addition less than 1.1 phr increased the cross-linking density, the excess addition of zirconate resulted in the increase of uncross-linked impurity. From the increase of T-peel and lap shear strength and the change of fracture mode from the adhesive failure to the mixed one, it was considered that the small addition of zirconate was effective in improving the adhesion strength of epoxy adhesive to the adherend and inorganic filler surfaces. The formation of uncross-linked impurity with the excess addition of zirconate was considered to decrease the joint strength by decreasing the cohesive strength of the cured epoxy.

Keywords

References

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