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Producing and Mechanical Testing of Urea-Formaldehyde Resin Foams Reinforced by Waste Phosphogypsum

Authors: Krasimira Georgieva, Yordan Denev


Many of thermosetting resins have application only in filled state, reinforced with different mineral fillers. The co-filling of polymers with mineral filler and gases creates a possibility for production of polymer composites materials with low density. This processing leads to forming of new materials – gas-filled plastics (polymer foams). The properties of these materials are determined mainly by the shape and size of internal structural elements (pores). The interactions on the phase boundaries have influence on the materials properties too. In the present work, the gas-filled urea-formaldehyde resins were reinforced by waste phosphogypsum. The waste phosphogypsum (CaSO4.2H2O) is a solid by-product in wet phosphoric acid production processes. The values of the interactions polymer-filler were increased by using two modifying agents: polyvinyl acetate for polymer matrix and sodium metasilicate for filler. Technological methods for gas-filling and recipes of urea-formaldehyde based materials with apparent density 20-120 kg/m3 were developed. The heat conductivity of the samples is between 0.024 and 0.029 W/moK. Tensile analyses were carried out at 10 and 50% deformation and show values 0.01-0.14 MPa and 0.01-0.09 MPa, respectively. The apparent density of obtained materials is between 20 and 92 kg/m3. The changes in the tensile properties and density of these materials according to sodium metasilicate content were studied too. The mechanism of phosphogypsum adsorption modification was studied using methods of FT-IR spectroscopy. The structure of the gas-filled urea-formaldehyde resins was described by results of electron scanning microscopy at three different magnification ratios – x50, x150 and x 500. The aim of present work is to study the possibility of the usage of phosphogypsum as mineral filler for urea-formaldehyde resins and development of a technology for the production of gas-filled reinforced polymer composite materials. The structure and the properties of obtained composite materials are suitable for thermal and sound insulation applications.

Keywords: Mechanical Properties, phosphogypsum, Gas-filled thermosets, urea-formaldehyde resins

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[1] K. C. Frisch, “History of Science and Technology of Polymeric Foams,” J. Macromol. Sci. A, vol. 15, no. 6, pp. 1089-1112, 1981.
[2] S.-T. Lee, Polymeric foams: innovations in processes, technologies, and products. Taylor & Francis CRC Press, 2017.
[3] M. O. Okoroafor, K. C. Frisch, "1 - Introduction to Foams and Foam Formation," in Handbook of Plastic Foams, A. H. Landrock, Ed. William Andrew Publishing, 1995, pp. 1-10.
[4] Plastics Foams: US Industry Study with Forecasts for 2017 & 2022. Freedonia Report #3114, pub. December 2013.
[5] H. Dodiuk, S. H. Goodman, Handbook of Thermoset Plastics. William Andrew, 2013.
[6] L. Aditya, T. M. Indra, B. Rismanchi, H. M. Ng, M. H. Muhammad, H. S. C. Metselaar, H. B. Aditiya, “A review on insulation materials for energy conservation in buildings,” Renew. Sust. Energ. Rev., vol. 73, pp. 1352-1365, 2017.
[7] D. V. Rosato, D. V. Rosato, M. V. Rosato, "8 - Foaming," in Plastic Product Material and Process Selection Handbook, D. V. Rosato, D. V. Rosato, M. V. Rosato, Ed. Elsevier, 2004, pp. 333-368.
[8] D. W. Wang et al., "Study of Preparation and Properties of Fire-Retardant Melamine Formaldehyde Resin Foam", Adv. Mater. Res., vol. 510, pp. 634-638, 2012.
[9] M. S. Al-Homoud, “Performance characteristics and practical applications of common building thermal insulation materials,” Build. Environ., vol. 40, no. 3, pp. 353-366, 2005.
[10] A. M. Papadopoulos, "State of the art in thermal insulation materials and aims for future developments,” Energ. Buildings, vol. 37, no. 1, pp. 77-86, 2005.
[11] S.-T. Lee, N. S. Ramesh, Polymeric foams: mechanisms and materials. CRC Press, 2004.
[12] S.-T. Lee, C. B. Park, N. S. Ramesh, Polymeric foams: science and technology. CRC/Taylor & Francis, 2006.
[13] S.-T. Lee, Dieter Peter Klaus Scholz, Polymeric Foams Technology and Developments in Regulation Process and Products. CRC Press, 2008.
[14] S.-T. Lee, Polymeric foams: innovations in processes, technologies, and products. Taylor & Francis CRC Press, 2017.
[15] P. S. Liu, G. F. Chen, Porous Materials Processing and Applications. Tsinghua University Press Ltd, Elsevier, 2014.
[16] NIIR Board, Handbook on Soaps, Detergents & Acid Slurry (3rd Rev. Ed.). SIA Pacific Business Press Inc., 2013.
[17] G. Wypych, Handbook of Foaming and Blowing Agents. Elsevier, 2017.
[18] US2559891A, Production of urea-formaldehyde hardened foam, US, 1951.
[19] US3979341A, Urea formaldehyde foam, US, 1976.
[20] US6602924B1, Foamed gypsum compositions, US, 2002.
[21] CA2654483A1, Urea-formaldehyde resin reinforced gypsum composites and building materials made therefrom, Canada, 2008.
[22] Y. S. Lipatov, Polymer Reinforcement. ChemTec Publishing, 1995.
[23] N. Sharma, S. Sharma, S. P. Guleria, N.K. Batra, “Mechanical Properties of Urea Formaldehyde Resin Composites Reinforced with Bamboo, Coconut and Glass Fibers,” IJSCE, vol. 5, no. 2, May 2015.
[24] X. Hu, W. Cheng, C. Li, G. Wang, X. Lin, Z. Liu, “Effects of surfactants on the mechanical properties, microstructure, and flame resistance of phenol–urea–formaldehyde foam,” Polym Bull., vol. 73, no. 1, July 2015.
[25] J. B. Zhong, J. Lv, C. Wei, “Mechanical properties of sisal fibre reinforced ureaformaldehyde resin composites,” Express Polym. Lett., vol. 1, no. 10, pp. 681–687, 2007.
[26] A. Nuryawan, I. Risnasari, T. Sucipto, A. Heri Iswanto, R. Rosmala Dewi, “Urea-formaldehyde resins: production, application and testing,” IOP Conf. Series: Mater. Sci. Eng., vol. 223, 2017.
[27] M. A. Ahmedov, T. A. Aganuziev, Phosphogypsum. Fan, Tashkent, 1980.
[28] S. D. Evenglika, A. A. Novikova, Phosphogypsum and its use. Ch. Moscow, 1990.
[29] R. Brown, Handbook of Polymer Testing: Physical Methods. CRC Press, 1999.
[30] Y. G. Denev, G. D. Denev, A. N. Popov, “Surface modification of phosphogypsum used as reinforcing material in polyethylene composites,” J. Elastom. Plast., vol. 41, no. 2, pp. 119-132, 2009.
[31] Y. Denev, K. Georgieva, G. Denev, “Morphology and surface modification of waste phosphogypsum utilized as mineral filler for polymer composite materials,” in Proc. 16th European Conference on Composite Materials, Sevilla, 2014.
[32] U. Zoller, ‎P. Sosis, Handbook of Detergents, Part F: Production. CRC Press, 2008.
[33] Masschelein, Unit Processes in Drinking Water Treatment. CRC Press, 1992.
[34] Y. Zhang, B. Pang, S. Yang, W. Fang, S. Yang, T.-Q. Yuan, “Improvement in Wood Bonding Strength of Poly(Vinyl Acetate-Butyl Acrylate) Emulsion by Controlling the Amount of Redox Initiator,” Materials, vol. 11, p. 89, 2018.
[35] E. Allen, J. Iano, Fundamentals of Building Constructions Materials and Methods. Wiley, 2013.
[36] M. J. Schick, F. M. Fowkes, “Foam Stabilizing Additives for Synthetic Detergents. Interaction of Additives and Detergents in Mixed Micelles,” J. Am. Chem. Soc., vol. 61, no. 8, pp. 62-68, 1957.
[37] A. F. M. Barton, Handbook of Polymer-Liquid Interaction Parameters and Solubility Parameters. CRC Press, 1990.
[38] J. Jancar, Mineral Fillers in Thermoplastics I: Raw Materials and Processing. Springer, 2003.
[39] T. Hasegawa, Quantitative Infrared Spectroscopy for Understanding of a Condensed Matter. Springer, 2017.
[40] G. Chen. “Treatment of Wood with Polysilicic Acid Derived From Sodium Silicate For Fungal Decay Protection,” Wood Fiber Sci., vol. 41, no 3, pp. 220-228, 2009.
[41] A. N. Lazarev, Vibrational spectra and structure of silicates. Consultants Bureau, 1972.
[42] K. Nakamoto, Infrared and Raman Spectra of Inorganic and Coordination Compounds. Wiley, New York, 1997.
[43] Z. Wang, Y. Sun, S. Zhang, Y. Wang. “Effect of sodium silicate on Portland cement/alcium aluminate cement/gypsum rich-water system: strength and microstructure,” RSC Adv., vol. 9, pp. 9993-10003, 2019.
[44] P. S. Liu, X. M. Ma, Testing methods of porous materials. Beijing: Metallurgical Industry Press, 2005.