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http://dx.doi.org/10.14190/JRCR.2020.8.1.129

A Study on Remaining Formaldehyde Concentration in the Synthesis of Self-Healing Microcapsules  

Kim, Dong-Min (Department of Chemistry, Yonsei University)
Lee, Jun-Seo (Department of Chemistry, Yonsei University)
Ryu, Byung-Cheol (Korea Conformity Laboratories)
Chung, Chan-Moon (Department of Chemistry, Yonsei University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.8, no.1, 2020 , pp. 129-133 More about this Journal
Abstract
The concentration of remaining formaldehyde contained in waste liquid emitted from the process of urea-formaldehyde microcapsule synthesis was analyzed by gas chromatography-mass spectrometry (GC-MS). Three factors that can affect on the reaction of formaldehyde were selected including pH, ammonium chloride input and temperature. The effect of these factors on the concentration of remaining formaldehyde was studied. When ammonium chloride input was 0.025g, microcapsules could not be obtained or core substance leaked out because of weak shell, and therefore this reaction condition would be inadequate. It was confirmed that the concentration of remaining formaldehyde could be minimized when the microencapsulation was conducted at 70℃ and pH 2.5 by using a ammonium chloride input of 0.050g. This study can make contribution to UF microencapsulation in safer working environment.
Keywords
Microcapsule synthesis; Remaining formaldehyde; Self-healing; Gas chromatography-mass spectrometry;
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