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Evaluation of Physical Properties according to Mixing Ratio and the Survey of the Current Situation for Epoxy Resin used in Conservation
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  • Journal title : Journal of Conservation Science
  • Volume 32, Issue 2,  2016, pp.223-234
  • Publisher : The Korean Society Of Conservation Science For Cultural Properties
  • DOI : 10.12654/JCS.2016.32.2.11
 Title & Authors
Evaluation of Physical Properties according to Mixing Ratio and the Survey of the Current Situation for Epoxy Resin used in Conservation
Lee, Eun Ji; Jang, Sung Yoon;
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Two-component epoxy resin is widely used in the cultural heritage restoration field. However according to mixing ratio of resin and hardener, curing property, mechanical strength and chemical structure differ which have possibility to effect the stability of cultural heritage. Result of questionnaire survey shows hands-on workers in the conservation field tend to mix the epoxy resin with his or her eye measurement when the using amount is small or mix additional hardener to shorten the pot life of epoxy resin. This research aims to analyze the curing property, mechanical strength and chemical structure of rapid curing type epoxy resin and medium curing type one depending on relative ratio of 0.25~4 of hardener to resin. When the amount of hardener was 0.5~2 times more than the resin, exothermic heat and curing speed were both increased. In case of included hardener to resin was lower than official ratio, mechanical strength (tensile shear strength, tensile strength and compressive strength) became higher along with active cross-linking bonding of the epoxy resin. Medium curing type epoxy relatively had lower exothermic heat and slower reaction during curing process. It was observed to be put to definite point of mechanical strength under lower content of hardener than official ratio. While, hardener ratio more than twice the resin slowed down the curing greatly and lowered the adhesion strength also. In conclusion, under the lower mixing rate of hardener than official ratio would show relatively fast reaction with similar mechanical strength. Over the official ratio on the other hand, material property drops rapidly. Accordingly, mixing ratio of epoxy resin is expected to be influential to the stability of cultural heritage.
Two component epoxy resin;Rapid curing;Mix ratio;Tensile strength;Tensile shear strength;
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