Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
권호 표지
DOI QR코드

DOI QR Code

Preparation and Thermal Insulation Property of UV Curable Hybrid Coating Materials Based on Silica Aerogel

실리카 에어로겔을 이용한 자외선 경화형 복합 코팅 물질의 제조 및 단열 특성

  • Kim, Nam-Yi (Department of Chemical Engineering, Kyonggi University) ;
  • Kim, Seong-Woo (Department of Chemical Engineering, Kyonggi University)
  • Received : 2012.02.29
  • Accepted : 2012.03.21
  • Published : 2012.03.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the composite coating materials with improved thermal insulation property were prepared by incorporating the hydrophobic silica aerogel. The surface modification of silica aerogel was performed to obtain UV curable urethane acrylate hybrid coating sols with good compatibility by using surfactant(Brij 56). The polycarbonate substrates were coated by the prepared composites and cured under UV radiation. The incorporation of aerogel with only 10 vol% of content resulted in remarkable improvement by about 28% in the thermal insulation property of the coated film, as compared with substrate. In addition, increasing aerogel content was found to give minor effect on the variation of optical transparency, adhesion, and surface hardness of the coated film.

본 연구에서는 초소수성 실리카 에어로겔을 이용하여 단열 성능을 갖는 투명 필름용 유/무기 복합 코팅물질을 제조하였다. 바인더 물질로 사용된 자외선 경화형 우레탄 아크릴레이트 수지와 에어로겔과의 상용성을 위해 계면활성제(Brij 56)를 이용하여 에어로겔의 표면을 개질하였다. 개질된 에어로겔을 고분자 수지와 복합화한 코팅 용액을 폴리카보네이트 기지재에 코팅한 후 자외선경화를 통해 코팅필름을 제조하였다. 에어로겔이 10 vol% 함량으로 첨가되었을 때, 코팅필름의 단열성능은 측정된 열전도도 기준으로 순수 기지재 대비 28% 정도로 향상되었다. 또한, 코팅필름의 광투과율은 에어로겔이 50 vol%로 과량 첨가된 경우에도 80% 이상 높은 수준을 유지하였으며, 우수한 접착성(5B) 및 연필 경도(4H)를 보여주었다.

Keywords

References

  1. H. S. Kim, S. K. Jeong, and S. H. Jeong, Experimental Research about Thermal insulation Performance of Various Powder Insulation Methods, J. Kor. Inst. Appl. Supercond. Cryog., 12, 49 (2010).
  2. G. S. Kim and S. H. Hyun, Synthesis of Window Glazing Coated with Silica Aerogel Films via Ambient Drying, J. Non-Cryst. Solids, 320, 125 (2003).
  3. K. I. Jensen, J. M. Schultz, and F. H. Kristiansen, Development of Windows based on Highly Insulating Aerogel Glazings, J. Non-Cryst. Solids, 350, 351 (2004).
  4. J. E. Fesmire and S. D. Augustynowicz, Thermal Performance Testing of Glass Microspheres under Cryogenic Vacuum Conditions, Transactions of the Crygenic Engineering Conference, 49, 612, (2004).
  5. R. G. Baumgartner, E. A. Myers, J. E. Fesmire, D. L. Morries, and E. R. Sokalski, Demonstration of Microsphere Insulation in Cryogenic Vessels, Transactions of the Crygenic Engineering Conference, 51, 1351, (2006).
  6. S. S. Kistler, Coherent Expanded Aerogels and Jellies, Nature, 127, 741 (1931).
  7. M. Schmidt and F. Schwertfeger, Application for Silica Aerogel Products, J. Non-Cryst. Solids, 225, 364 (1998).
  8. I. S. Han, J. C. Park, S. Y. Kim, K. S. Hong, and H. J. Hwang, Fabrication and Network Strengthening of Monolithic Silica Aerogels Using Water Glass, J. Kor. Ceram. Soc., 44, 162 (2007).
  9. P. H. Tewart, A. J. Hunt, and K. D. Loffus, Mater. Lett., 3, 363 (1985).
  10. N. Husing and U. Schubert, Aerogel-Airy Materials: Chemistry, Structure, and Properties, Angew. Chem. Int. Ed., 37, 22 (1998).
  11. L. W. Hrubesh, Aerogel applications, J. Non-Cryst. Solids, 225, 335 (1998).
  12. G. M. Pajonk, Some Applications of Silica Aerogels, Colloid Polym. Sci., 281, 637 (2003).
  13. A. P. Rao, A. V. Rao, and J. L. Gurav, Effect of Protic Solvents on the Physical Properties of the Ambient Pressure Dried Hydrophobic Silica Aerogels using Sodium Silicate Precursor, J. Porous. Mater, 15, 507 (2008).
  14. Y. C. Cha, J. S. Yoon, J. Lee, H. J. Hwang, and J. W. Moon, Ambient Pressure Dried Silica Aerogel Thin Film from Water Glass, J. of the Kor. Ceram. Soc., 45, 87 (2008).
  15. J. L. Gurav, A. V. Rao, A. P. Rao, D. Y. Nadargi, and S. D. Bhagat, Physical Properties of Sodium Silicate based Silica Aerogels Prepared by Single Step Sol-Gel Process Dried at Ambient Pressure, J. of Alloys and Compounds, 476, 397 (2009).
  16. S. D. Bhagat, Y. H. Kim, Y. S. Ahn, and J. G. Yeo, Rapid Synthesis of Water-glass based Aerogels by In situ Surface Modification of the Hydrogels, Appl. Surf. Sci., 253, 3231 (2007).
  17. N. Y. Kim, and S. W. Kim, Surface Modification of Silica Aerogel by Surfactant adsorption and heat treatment methods, J. Kor. Oil. Chem. Soc., 27, 282 (2010).