Homojen çökeltme ile sentezlenmiş çinko borat ve span 60 içeren iğ yağından üretilen lubrikantlar

Öz

Nano çinko borat tanecikleri, çinko boratın amonyakta çözülmesi ve daha sonra amonyağın yavaşca uçurulması ile nano tanecikler olarak çökelmesine dayanan homojen çökelme metodu ile elde edilmiştir. Örnekler ileri analiz teknikleri ile karakterize edilmiştir. Nano çinko borat tanecikleri Span 60 içeren iğ yağına lubrikant katkısı olarak kullanılmıştır. Optik mikroskopta tanelerin yağ içinde homojen bir şekilde dağıldığı gözlenmiştir. Lubrikantlara uygulanan dört top testleri çinko borat katkısının aşınma izi çapını önemli oranda (%61.8) küçülttüğünü göstemişitr. Test toplarının aşınmış yüzeylerinin sertliğinin 688 HV den 618 HV ye düşmesi ve yüzeyde gömülü çinko borat taneciklerinin varlığı esnek bir kabuk oluştuğunu göstermiştir. Böylece top yüzeyleri arasındaki temas alanı artarak, birim alana uygulanan yük azalmıştır. Yüzeyin pürüzlülüğü 35.63 nm den 26.60 nm ye düşmüştür. Homojen çökeltme ile elde edilen çinko boratın madeni yağa katılması ile birbirine sürtünen yüzeylerdeki aşınmanın azaldığı anlaşılmıştır.

Anahtar Kelimeler

• dört top testleri
• homojen çökelme
• lubrikantlar
• nano tanecikler
• Span 60
• çinko borat

Lubricants having zinc borate by homogeneous precipitation and Span 60 in spindle oil

Öz

Nano particles of zinc borate were obtained by homogeneous precipitation method which is based on dissolving zinc borate in ammonia and precipitating it as nano particles by slow evaporation of ammonia. The synthesized zinc borates were characterized by advanced analytical techniques. Zinc borate nano particles were used as a lubricant additive to spindle oil having Span 60 dispersant. The particles were well dispersed in spindle oil as shown by optical microscopy of the oils. Four ball tests of the lubricants indicated zinc borate lowered (61.8%) the wear scar diameter significantly. The hardness of wear surfaces of test balls was reduced from 688 HV to 618 HV and presence of zinc borate particles embedded on the surface indicated a flexible skin was formed. Therefore the pressure was decreased due to increase of the contact area of the balls. The surface roughness was also decreased from 35.63 nm to 27.60 nm by the addition of zinc borate to spindle oil having Span 60. Zinc borate prepared by homogeneous precipitation technique lowered the wear of the surfaces that rub to each other.

Anahtar Kelimeler

• four ball tests
• homogeneous precipitation
• lubricants
• nano particles
• Span 60
• Zinc borate

Kaynakça

1. Gao, P. Q., Song, W. H, Wang X.(2013). Preparation and Characterization of Nano Zinc Borate/Epoxide Resin Composite. Key Engineering Material, 567, 87–90.
2. Mergen, A., Ipek, Y., Bolek, H. , Oksuz, M.(2012) Production of nano zinc borate (4ZnO ·B2O3· H2O) and its effect on PVC. Journal of Europan Ceramic Society, 32, 2001-2005.
3. Savrık, S.A., Balköse, D. , Ülkü, S. (2011) Synthesis of Zinc Borate by Inverse Emulsion Technique for Lubrication. Journal of Thermal Analysis and Calorimetry,104(201), 605–612.
4. Li, S., Long, B., Wang, Z., Tian, Y., Zheng, Y., Zhang, Q. (2010) Synthesis of hydrophobic zinc borate nanoflakes and its effect on flame retardant properties of polyethylene. Journal of Solid State Chemisty,183, 957-962.
5. Saffari, H.R.M., Soltani, R., Alaei ,M., Soleymani, M.(2018) Tribological properties of water-based drilling fluids with borate nanoparticles as lubricant additives, Journal of Petroleum Science and Engineering, 171, 253-259.
6. Ipek, Y., Effect of surfactant types on particle size and morphology of flame retardant zinc borate powder, Turkish Journal of Chemistry, 44, 214–223, 2020.
7. Baltacı B.(2010) Synthesis and Characterizatıon of Nano Zinc Borate and Its Usage as A Flame Retardant for Polymers [ M. Sc. thesis, Middle East Technical Universitiy]. Council of Higher Education Thesis Center (Thesis Number 286210)
8. Baltaci, B., Cakal, G.O., Bayram,, G., Eroglu, I., Ozkar, S. (2013) .Surfactant modified zinc borate synthesis and its effect on the properties of PET. Powder Technology, 244,38-44.

9. Cakal, G. O., Baltaci, B. , Bayram, G., Ozkar S., Eroglu, I.(2020) Synthesis of zinc borate using water soluble additives: Kinetics and product characterization. Journal of Crystal Growth, 533, 125461.
10. Cui,Y., Liu, X., Tian, Y., Ding, N.,Wang, Z.(2012) Controllable synthesis of three kinds of zinc borates and flame retardant properties in polyurethane foam. Colloids and Surfaces A: Physicocheical and Engineering Aspects 414, 274– 280.
11. Polat, S., Sayan, P.(2020) Box–Behnken experimental design for zinc borate Zn2B6O11·7H2O. Journal of Boron, 5 (3), 152 – 161.
12. Gao, J., Yin, H., Wang, A., Jiang, T.(2013) Preparation of zinc borates with different structures and morphologies and their effect on thermal and oxidative stability of polyvinyl alcohol. Powder Technology, 237, 537–542.
13. Durrani, H., Sharma, V., Bamboria, D., Shukla, A., Basak, S., Ali, W. (2020) Exploration of flame retardant efficacy of cellulosic fabric using in-situ synthesized zinc borate particles, Cellulose, 27, 9061–9073.
14. Savrik, S. A., Alp, B., Ustun, F., Balköse, D. (2018)Nano zinc Borate as a lubricant additive. Journal of Turkish Chemical Society A, 5 ( 1), 45 – 52.
15. Zhao, C., Jiao, Y., Chen, Y., Ren, G.(2014) The Tribological Properties of Zinc Borate Ultrafine Powder as a Lubricant Additive in Sunflower Oil. Tribology Transactions, 57, 425-434.
16. Zhao, C. , Chen, Y.K., Jiao, Y., Loya, A., Ren, G.G.,(2014) The preparation and tribological properties of surface modified zinc borate ultrafine powder as a lubricant additive in liquid paraffin. Tribology International 70, 155–164.
17. Ting, C., Deng, J. C., Shuo, W. L., Gang, F.(2009) Preparation and Characterization of Nano-Zinc Borate by a New Method. Journal of Materials Processing Technology, 209, 4076-4079.
18. Savrik S. A.(2010) Enhancement of Tribologıcal Properties of Mineral Oil by Addition of Sorbitan Monostearate and Zinc Borate [PhD Thesis, İzmir Institute of Technology). Council of Higher Education Thesis Center (Thesis number 266584)
19. Gao, Y. H., Liu, Z. H.(2009) Synthesis and Thermochemistry of Two Zinc Borates, Zn2B6O11∙7H2O and Zn3B10O18∙14H2O. Thermochimica Acta, 484, 27-31.
20. Alp, B., Gonen, M., Savrık, S. A., Balkose, D., Ulku, S.(2012) Dehydration, Water Vapor Adsorption and Desorption Behavior of Zn[B3O3(OH)5] ·H2O and Zn[B3O4(OH)3]. Drying Technology, 30, 1610–1620.
21. Moezzi, A., Lee, P., McDonagh, A.M., Michael, B., Cortie, M.B.(2020) On the thermal decomposition of zinc hydroxide nitrate, Zn5(OH)8(NO3)2⋅2H2O. Jourmal of Solid State Chemisty, 286, 121311.
22. Schubert, D. M.(2019) Hydrated zinc borates and their industrial use. Molecules, 24, 2419.
23. Briggs, M. (2001) Boron Oxides, Boric Acid, and Borates, in: Kirk-Othmer Encyclopedia of Chemical Technology, Wiley & Sons.
24. Eltepe, H. E., Balkose, D., Ulku, S.(2007)Effect of temperature and time on zinc borate species formed from zinc oxide and boric acid in aqueous medium. Industrial and Engineering Chemistry and Research, 46, 2367-237.
25. Zheng, Y., Tian, Y., Ma, H.,Qu, Y., Wang, Z. et al.(2009) Synthesis and Performance Study of Zinc Borate Nanowhiskers. Colloids and Surfaces A. 339,178-184.
26. Dong, J.X., Hu, Z.S.(1998) A Study of the Anti-Wear and Friction-Reducing Properties of the Lubricant Additive, Nanometer Zinc Borate. Tribology International, 31, 219-223.
27. Erdemir, A., Lubrication from Mixture of Boric Acid with Oils and Greases. U.S. Patent 5,431,830, 1995.
28. Lingtong, K., Hua, H., Tianyou, W., Dinghai, H., Jianjian F.(2011) Synthesis and surface modification of the nanoscale cerium borate as lubricant additive. Journal of Rare Earths, 29, 1095-1099.
29. Yu, H., Xu, Y., Shi, P., Xu, B., Wang, X.(2008) Tribological Properties and Lubricating Mechanisms of Cu Nanoparticles in Lubricant. Transactions of Nonferrous Metals Society of China, 18, 636-641.