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P- and Si-modified shellac for flame-retardant epoxy-based coatings

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Abstract

This is an attempt to develop thermally stable shellac–epoxy coating blends with flame-retardant properties. The monophosphazene and silicon precursors were synthesized with PCl5 and dichlorodimethylsilane (DCMS) as phosphorus and silicon sources, respectively. The synthesized phosphazene and silicon precursor moieties were then reacted with shellac in various concentrations to prepare the modified shellac. The shellac/modified shellac and epoxy coatings were then mixed to form the blend formulations and coated onto the mild steel panels. The structure confirmation of both the precursors was achieved using physicochemical analysis, FTIR and NMR, while the modified shellac was characterized using FTIR. Furthermore, the thermal, mechanical and flame-retardant properties of the coating blends were analyzed. The Tg values and the degradation curves showed that the coating blends with Si and P modification were more thermally stable than the unmodified shellac blends. The maximum LOI obtained was 27 for the highest concentrations of P and Si in the coating, similarly, the calculations based on the char yields of LOI also showed the similar trend of increasing values although the values were lower than the practical LOI values. The barrier properties were predicted depending on the results of water absorption and gel content values which showed that the crosslinking density was increasedwith increasing concentrations of shellac in the coating.

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References

  1. Farag Y (2010) Characterization of different shellac types and development of shellac-coated dosage forms. Staats-und Universitätsbibliothek Hamburg Carl von Ossietzky

    Google Scholar 

  2. Tamburini D, Dyer J, Bonaduce I (2017) The characterisation of shellac resin by flow injection and liquid chromatography coupled with electrospray ionisation and mass spectrometry. Sci Rep 7:1–5

    Article  Google Scholar 

  3. Limmatvapirat S, Limmatvapirat C, Puttipipatkhachorn S (2007) Enhanced enteric properties and stability of shellac films through composite salts formation. Eur J Pharm Biopharm 67:690–698

    Article  CAS  Google Scholar 

  4. Marareza H (2018) Modification of chemical properties of shellac with glycerol and acrylic acid. Key Eng Mater 789:87–91

    Article  Google Scholar 

  5. Patel HS, Patel SJ (2010) Novel surface coating system based on maleated shellac. E-J Chem 7:55–60

    Article  Google Scholar 

  6. Ansari MF, Sarkhel G (2017) Improving coating properties of shellac-epoxidised- novolac blends with melamine formaldehyde resin. Pigment Resin Technol 46:92–99

    Article  CAS  Google Scholar 

  7. Ansari MF, Sarkhel G, Goswami DN, Baboo B (2014) Coating properties of shellac modified with synthesised epoxidised-novolac resin. Pigment Resin Technol 43:314–322

    Article  CAS  Google Scholar 

  8. Pearnchob N, Siepmann J, Bodmeier R (2003) Pharmaceutical applications of shellac: moisture-protective and taste-masking coatings and extended-release matrix tablets. Drug Dev Ind Pharm 29:925–938

    Article  CAS  Google Scholar 

  9. Limmatvapirat S, Limmatvapirat C, Luangtana-Anan M (2004) Modification of physicochemical and mechanical properties of shellac by partial hydrolysis. Int J Pharm 278:41–49

    Article  CAS  Google Scholar 

  10. Hodgson DM, Gras E (2002) Recent developments in the chemistry of lithiated epoxides. Synthesis 27:1625–1642

    Article  Google Scholar 

  11. Wang GA, Cheng WM, Tu YL (2006) Characterizations of a new flame-retardant polymer. Polym Degrad Stab 91:3344–3353

    Article  CAS  Google Scholar 

  12. Li Q, Jiang P, Su Z (2005) Synergistic effect of phosphorus, nitrogen, and silicon on flame-retardant properties and char yield in polypropylene. J Appl Polym Sci 96:854–860

    Article  CAS  Google Scholar 

  13. Gu J, Dang J, Wu Y (2012) Flame-retardant, thermal, mechanical and dielectric properties of structural non-halogenated epoxy resin composites. Polym Plast Technol Eng 51:1198–1203

    Article  CAS  Google Scholar 

  14. Liu H, Wang X, Wu D (2015) Synthesis of a novel linear polyphosphazene-based epoxy resin and its application in halogen-free flame-resistant thermosetting systems. Polym Degrad Stab 118:45–58

    Article  CAS  Google Scholar 

  15. Elayan A, Christopher W, Allen ESP (2017) Synthesis of poly(dichlorophosphazene) by the melt phase polymerization of p-trichloro-N-(dichlorophosphoryl)monophosphazene. J Inorg Organomet Polym Mater 27:119–123

    Article  CAS  Google Scholar 

  16. Zhou X, Qiu S, Mu X (2020) Polyphosphazenes-based flame retardants: a review. CompositesPart B 202:108397

    Article  CAS  Google Scholar 

  17. Liu Q, Wang D, Li Z (2020) Recent developments in the flame-retardant system of epoxy resin. Materials 13:2145

    Article  CAS  Google Scholar 

  18. Salmeia KA, Gaan S, Malucelli G (2016) Recent advances for flame retardancy of textiles based on phosphorus chemistry. Polymers 8:319

    Article  Google Scholar 

  19. Scharte B (2010) Phosphorus-based flame retardancy mechanisms-old hat or a starting point for future development? Materials 3:4710–4745

    Article  Google Scholar 

  20. Qian X, Song L, Bihe Y (2014) Organic/inorganic flame retardants containing phosphorus, nitrogen and silicon: preparation and their performance on the flame retardancy of epoxy resins as a novel intumescent flame retardant system. Mater Chem Phys 143:1243–1252

    Article  CAS  Google Scholar 

  21. Law KY (2014) Definitions for hydrophilicity, hydrophobicity, and superhydrophobicity: getting the basics right. J Phys Chem Lett 5:686–688

    Article  CAS  Google Scholar 

  22. Gleria M (1999) Current research and applications of phosphazene materials. Phosphorus Res Bull 10:55–69

    Article  CAS  Google Scholar 

  23. Van Krevelen DW, Nijenhuis KT (2009) Properties of polymers their correlation with chemical structuretheir numerical estimation and prediction from additive group contributions. Elsevier

    Google Scholar 

  24. Gu JW, Zhang GC, Dong SL, Zhang QY, Kong J (2007) Study on preparation and fire-retardant mechanism analysis of intumescent flame-retardant coatings. Surf Coatings Technol 201:7835–7841

    Article  CAS  Google Scholar 

  25. Chen X, Jiao C (2008) Thermal degradation characteristics of a novel flame retardant coating using TG-IR technique. Polym Degrad Stab 93:2222–2225

    Article  CAS  Google Scholar 

  26. Agrawal S, Narula AK (2014) Synthesis and characterization of phosphorus- and silicon-containing flame-retardant curing agents and a study of their effect on thermal properties of epoxy resins. J Coatings Technol Res 11:631–637

    Article  CAS  Google Scholar 

  27. Carja ID, Serbezeanu D, Vlad-Bubulac T (2014) A straightforward, eco-friendly and cost-effective approach towards flame retardant epoxy resins. J Mater Chem A 2:16230–16241

    Article  CAS  Google Scholar 

  28. Vlad-bubulac T, Hamciuc C, Petreus O (2005) Synthesis and properties of some phosphorus-containing polyesters. High Perform Polym 1:255–264

    Google Scholar 

  29. Satdive A, Mestry S, Borse P, Mhaske S (2020) Phosphorus- and silicon-containing amino curing agent for epoxy resin. Iran Polym J 29:433–443

    Article  CAS  Google Scholar 

Download references

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Authors and Affiliations

  1. Department of Chemical Engineering- Plastics and Polymer, Birla Institute of Technology, Mesra, Ranchi, India

    Vinay Jhajharia

  2. Department of Polymer and Surface Engineering, Institute of Chemical Technology, Mumbai, India

    Rahul Patil, Siddhesh Mestry & S. T. Mhaske

Authors
  1. Vinay Jhajharia
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  2. Rahul Patil
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  3. Siddhesh Mestry
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  4. S. T. Mhaske
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Correspondence to S. T. Mhaske.

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Jhajharia, V., Patil, R., Mestry, S. et al. P- and Si-modified shellac for flame-retardant epoxy-based coatings. Iran Polym J 30, 907–916 (2021). https://doi.org/10.1007/s13726-021-00941-w

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  • DOI: https://doi.org/10.1007/s13726-021-00941-w

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