Fig. 1. ATR-FTIR spectra of B-pMDI (a), and cured B-pMDI/MUF adhesives with different contents of B-pMDI (b).
Fig. 2. Typical ATR-FTIR spectra of B-pMDI/MUF resins at different levels of B-pMDI after hydrolysis (a), and their mass loss (b).
Fig. 3. DSC thermograms of B-pMDI/MUF resins at different contents of B-pMDI and different heating rates: neat MUF resins (a), 1% B-pMDI/MUF adhesives (b), 2% B-pMDI/MUF adhesives (c), typical DSC thermograms of B-pMDI/MUF adhesives at 10°C/min (d).
Fig. 4. Kissinger plot and Ea values of B-pMDI/MUF resins as a function of B-pMDI level.
Fig. 5. TSS and formaldehyde emission (FE) of surface laminate plywood bonded with B-pMDI/MUF resins as a function level of B-pMDI: Dry TSS (a), semi water proof TSS (b), water proof TSS (c), and FE values (d).
Table 1. Basic properties of B-pMDI/MUF hybrid adhesives as a function of B-pMDI content
참고문헌
- Cai, X., Riedl, B., Wan, H., Zhang, S.Y., Wang, X. 2010. A study on the curing and viscoelastic characteristics of melamine-urea-formaldehyde resin in the presence of aluminium silicate nanoclays. Composites Part A 41(5): 604-611. https://doi.org/10.1016/j.compositesa.2010.01.007
- Delebecq, E., Pascault, J.P., Boutevin, B., Ganachaud, F. 2012. On the versatility of urethane/urea bonds: Reversibility, blocked isocyanate, and non-isocyanate polyurethane. Chemical Reviews 113(1): 80-118. https://doi.org/10.1021/cr300195n
-
Despres, A., Pizzi, A., Delmotte, L. 2006.
$^{13}C$ NMR investigation of the reaction in water of UF resins with blocked emulsifiable isocyanates. Journal of Applied Polymer Science 99(2): 589-596. https://doi.org/10.1002/app.22498 - Dunky, M. 1998. Urea-formaldehyde (UF) adhesive resins for wood. International Journal of Adhesion and Adhesives 18(2): 95-107. https://doi.org/10.1016/S0143-7496(97)00054-7
- Dunky, M. 2004. Adhesives based on formaldehyde condensation resins. Macromolecular Symposia 217(1): 417-430. https://doi.org/10.1002/masy.200451338
- Frihart, C. R., 2005. Wood adhesion and adhesives: In Handbook of Wood Chemistry and Wood Composites, Ed. Roger M. Rowell. CRC Press, New York. 216-272.
- Gopal G., Nath, S.K., Sujatha, D. 2014. Blocking of PMDI Resin and Mixed Phenol Blocked PMDI/Phenol Cardanol Formaldehyde Hybrid Resin for Plywood. International Journal of Applied Science-Research and Review 1(3): 117-128.
- Hong, M.K., Park, B.D. 2017. Effect of Urea-Formaldehyde Resin Adhesive Viscosity on Plywood Adhesion, Journal of Korean Wood Science and Technology 45(2): 223-231 https://doi.org/10.5658/WOOD.2017.45.2.223
- Jeong, B., Park, B.D. 2016. Measurement of Molecular Weights of Melamine-Urea-Formaldehyde Resins and Their Influences to Properties of Medium Density Fiberboards, Journal of Korean Wood Science and Technology 44(6): 913-922. https://doi.org/10.5658/WOOD.2016.44.6.913
- Jiang, J., Lu, X. 2017. Improving characteristics of melamine-urea-formaldehyde resin by addition of blocked polyurethane prepolymer. European Journal of Wood and Wood Products 75(2): 185-191. https://doi.org/10.1007/s00107-016-1132-0
- Kamoun, C., Pizzi, A., Zanetti, M. 2003. Upgrading melamine-urea-formaldehyde polycondensation resins with buffering additives. I. The effect of hexamine sulfate and its limits. Journal of Applied Polymer Science 90(1): 203-214. https://doi.org/10.1002/app.12634
- Kandelbauer, A., Despres, A., Pizzi, A., Taudes, I. 2007. Testing by fourier transform infrared species variation during melamine-urea-formaldehyde resin preparation. Journal of Applied Polymer Science 106(4): 2192-2197. https://doi.org/10.1002/app.26757
- Kim, S., Kim, H.J. 2005. Comparison of formaldehyde emission from building finishing materials at various temperatures in under heating system; ONDOL. Indoor Air 15(5): 317-325. https://doi.org/10.1111/j.1600-0668.2005.00368.x
- Kim, S. 2009. Environment-friendly adhesives for surface bonding of wood-based flooring using natural tannin to reduce formaldehyde and TVOC emission. Bioresourse Technology 100(2): 744-748. https://doi.org/10.1016/j.biortech.2008.06.062
- Kissinger, H.E. 1957. Reaction Kinetics in Differential Thermal Analysis. Analytical Chemistry 29(11): 1702-1706. https://doi.org/10.1021/ac60131a045
- KS. 2016. KS F3101: Plywood. Korean Standard Association, Seoul, Republic of Korea.
- Li, X., Luo, J., Li, J., Gao, Q. 2016. Effects of diatomite inorganic fillers on the properties of a melamine-urea-formaldehyde resin. Journal of Applied Polymer Science 133: 1-8.
- Lubis, M.A.R., Park, B.D., Lee, S.M. 2017. Modification of urea-formaldehyde resin adhesives with blocked isocyanates using sodium bisulfite. International Journal of Adhesion and Adhesives 73: 118-124. https://doi.org/10.1016/j.ijadhadh.2016.12.001
- Lubis, M.A.R., Park, B.D. 2018. Analysis of the hydrolysates from cured and uncured ureaformaldehyde (UF) resins with two F/U mole ratios. Holzforschung 72: 759-768. https://doi.org/10.1515/hf-2018-0010
- Maminski, M.L., Pawlicki, J., Zado, A., Parzuchowski, P. 2007. Glutaraldehyde-modified MUF adhesive system - Improved hot water resistance. Holz als Roh-und Werkstoff 65(3): 251-253. https://doi.org/10.1007/s00107-006-0149-1
- Mansouri, H. R., Pizzi, A., Leban, J.M. 2006. Improved water resistance of UF adhesives for plywood by small pMDI additions. Holz als Roh-und Werkstoff 64(3): 218-220. https://doi.org/10.1007/s00107-005-0046-z
- Merline, D.J., Vukusic, S., Abdala, A.A. 2013. Melamine formaldehyde: Curing studies and reaction mechanism. Polymer Journal 45(4): 413-419. https://doi.org/10.1038/pj.2012.162
- Park, B.D., Lee, S.M., Roh, J.K. 2009. Effects of formaldehyde/urea mole ratio and melamine content on the hydrolytic stability of cured urea-melamineformaldehyde resin. European Journal of Wood and Wood Products 67: 121-123. https://doi.org/10.1007/s00107-008-0277-x
- Park, B.D., Kang, E.C., Lee, S.M., Park, J.Y. 2016. Formaldehyde emission of wood-based composite panels with different surface lamination materials using desiccator method, Journal of Korean Wood Science and Technology 44(4): 600-606. https://doi.org/10.5658/WOOD.2016.44.4.600
- Park, J.Y. 1998, Manufacturing of high water-resistant particleboard by combining use of urea resin and EMDI resin Journal of Korean Wood Science and Technology 26(1): 97-105.
- Pizzi, A., 2003. Melamine-formaldehyde adhesives. Handbook of Adhesive Technology. Second edition. Marcel Dekker, New York, 653-679.
- Siimer, K., Christjanson, P., Kaljuvee, T., Pehk, T., Lasn, I., Saks, I. 2008. TG-DTA study of melamine-ureaformaldehyde resins. Journal of Thermal Analysis and Calorimetry 92(1): 19-27. https://doi.org/10.1007/s10973-007-8721-4
- Simon, C., George, B., Pizzi, A. 2002. UF/pMDI wood adhesives: Networks blend versus copolymerization. Holzforschung 56(3): 327-334. https://doi.org/10.1515/HF.2002.052
- Stockel, F., Konnerth, J., Kantner, W., Moser, J., Gindl, W. 2010. Tensile shear strength of UF-and MUFbonded veneer related to data of adhesives and cell walls measured by nanoindentation. Holzforschung 64(3): 337-342. https://doi.org/10.1515/HF.2010.046
- Tohmura, S. I., Inoue, A., Sahari, S. H. 2001. Influence of the melamine content in melamine-ureaformaldehyde resins on formaldehyde emission and cured resin structure. Journal of Wood Science 47(6): 451-457. https://doi.org/10.1007/BF00767897
- Wicks, D. A., Wicks Jr, Z. W. 1999. Blocked isocyanates III: Part A. Mechanisms and chemistry. Progress in Organic Coatings 36(3): 148-172. https://doi.org/10.1016/S0300-9440(99)00042-9
- Wicks, D. A., & Wicks Jr, Z. W. 2001. Blocked isocyanates III: Part B: Uses and applications of blocked isocyanates. Progress in Organic Coatings 41(1-3): 1-83. https://doi.org/10.1016/S0300-9440(00)00164-8
- Zhou, X., Pizzi, A., Du, G. 2012. The effect of nanoclay on melamine-urea-formaldehyde wood adhesives. Journal of Adhesion Science and Technology 26: 1341-1348. https://doi.org/10.1163/156856111X618498