The Determination of the Zinc Sulfate, Sodium Hydroxide and Boric Acid Molar Ratio on the Production of Zinc Borates

Zinc borate is an important boron compound that can be used as multi-functional flame retardant additive due to its high dehydration temperature property. In this study, theraw materials of ZnSO₄.7H₂O, NaOH and H₃BO₃werecharacterized by X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR) and used in the synthesis of zinc borates.The synthesis parameters were set to 100°C reaction temperature and 120 minutes of reaction time, with different molar ratio of starting materials (ZnSO₄.7H₂O:NaOH:H₃BO₃). After the zinc borate synthesis, the identifications of the products were conducted by XRD and FT-IR. As a result,Zinc Oxide Borate Hydrate [Zn₃B₆O₁₂.3.5H₂O], were synthesized at the molar ratios of 1:1:3, 1:1:4, 1:2:5 and 1:2:6. Among these ratios 1:2:6 had the best results.

• N. Tugrul
• A. S. Kipcak
• E. MoroydorDerun
• S. Piskin

• Zinc borate
• ZnSO4.7H2O
• NaOH
• H3BO3
• XRD
• FT-IR.

[1] M. Gonen, D. Balkose, R. B. Gupta,and S. Ulku, "Supercritical carbondioxide drying of methanol zinc borate mixtures”, Ind. Eng. Chem. Res.,vol. 48, pp. 6869–6876, 2009.
[2] C. Ting, D. Jian-Cheng, W. Long-Shuo, and F. Gang, "Preparation and characterization of nano-zinc borate by a new method”, J. Mater. Process. Tech.,vol. 209, pp. 4076–4079, 2009.
[3] D. Gürhan, G. Ö. Çakal, İ. Eroğlu, and S. Özkar, Kesikli reaktörde çinko borat üretimini etkileyen parametrelerin incelenmesi, 1. National Boron Workshop Symposium Book, April 28-29, Ankara, 2005.
[4] D. Schubert, F. Alam, M. Visi and C. Knobler, "Structural characterization and chemistry of the industrially important zinc borate Zn[B3O4(OH)3]”, Chem. Mater.,vol. 15, pp. 866-871, 2002.
[5] H. E. Eltepe, D. Balköse, and S. Ülkü,"Effect of temperature and time on zinc borate species formed from zinc oxide and boric acid in aqueous medium”, Ind. Eng. Chem. Res., vol. 46, pp. 2367-2371, 2007.
[6] A. V. Shete, S. B. Sawant, and V. G. Pangarkar, "Kinetics of fluid–solid reaction with an insoluble product: zinc borate by the reaction of boric acid and zinc oxide”, J. Chem. Technol.Biot., vol. 79, pp. 526–532, 2004.
[7] X. Shi, Y. Xiao, M. Li, L. Yuan, and J. Sun,"Synthesis of an industrially important zinc borate, 2ZnO•3B2O3•3H2O, by a rheological phase reaction method”PowderTechnol.,vol. 186,pp. 263-266, 2008.
[8] H. Igarashi, H. Sawada, A. Tatebe, and K.Sakao, Patent No: 6780913,U.S.A., 2002.
[9] N. Tugrul, A.S. Kipcak, N. BaranAcarali, E. MoroydorDerun, S. Piskin, "Combined Hydrothermal Synthesis of Zinc and Magnesium Borates at 100°C using ZnO, MgO and H3BO3”, ICEBESE 2013: International Conference on Environmental, Biological and Ecological Sciences and Engineering, 26-27 September 2013, Rome, Italy.