Preparation of Flame Retardant Containing Phosphorus-nitrogen-boron and Its Application in Polyethylene

Abstract

MPHPB was prepared from melamine, phenylphosphonic acid and boric acid, and its flame retardant effect in PE was investigated. Compared to the intermediate product (melamine phenyl hypophosphite (MPHP)), the residual char increased from 17.9% of MPHP to 41.2% of MPHPB at 800 °C. The limiting oxygen index (LOI) of PE/20% MPHPB is 23.6%, which reaches V-0 rating. After the addition of 20% MPHPB, the total heat release (THR), peak heat release rate (pK–HRR), and average effective thermal combustion rates (av–EHC) of PE decreased. Additionally, characterizations including the pyrolysis gas chromatography-mass spectrometry (Py-GC-MS), scanning electron microscopy (SEM), raman spectroscopy test (LRS) and fourier transform infrared (FT–IR) were taken to investigate the flame retardant mechanism, and the results show that MPHPB plays roles in both gas and condensed phases.

Keywords

polythene / phosphorus-nitrogen-boron compound / flame retardant / flame retardant mechanism / gas and condensed phases flame retardant

References

[1] Zhang CB, Jiang YF, Li SH, et al.. Recent Trends of Phosphorus-Containing Flame Retardants Modified Polypropylene Composites Processing[J]. Heliyon, 2022, 8(11): 11 225-11 241

[2] Stürzel M, Mihan S, Mülhaupt R. From Multisite Polymerization Catalysis to Sustainable Materials and All-Polyolefin Composites[J]. Chemical Review, 2016, 116(3): 1 398-1 433

[3] Seidi F, Movahedifar E, Naderi G, et al.. Flame Retardant Polypropylenes: A Review[J]. Polymers, 2020, 12(8): 1 701-1 749

[4] Rezvani Ghomi E, Khosravi F, Mossayebi Z, et al.. The Flame Retardancy of Polyethylene Composites: From Fundamental Concepts to Nanocomposites[J]. Molecules, 2020, 25(21): 5 157

[5] Hohenwarter D, Mattausch H, Fischer C, et al.. Analysis of the Fire Behavior of Polymers (PP, PA 6 and PE-LD) and Their Improvement Using Various Flame Retardants[J]. Materials, 2020, 13(241-22

[6] Zhao WJ, Kundu CK, Li ZW, et al.. Flame Retardant Treatments for Polypropylene: Strategies and Recent Advances[J]. Composites Part A: Applied Science and Manufacturing, 2021, 145: 1-26

[7] Seidi F, Movahedifar E, Naderi G, et al.. Flame Retardant Polypropylenes: A Review[J]. Polymers, 2020, 12(8): 1 701-1 749

[8] Klincic D, Lovakovic BT, Jagic K, et al.. Polybrominated Diphenyl Ethers and the Multi-element Profile of House Dust in Croatia: Indoor Sources, Influencing Factors of Their Accumulation and Health Risk Assessment for Humans[J]. Science of the Total Environment, 2021, 800: 1-12

[9] Akortia E, Olukunle OI, Daso AP, et al.. Soil Concentrations of Polybrominated Diphenyl Ethers and Trace Metals from an Electronic Waste Dump Site in the Greater Accra Region, Ghana: Implications for Human Exposure[J]. Ecotoxicology and Environmental Safety, 2017, 137: 247-255

[10] Altarawneh M, Saeed A, Al-Harahsheh M, et al.. Thermal Decomposition of Brominated Flame Retardants (BFRs): Products and Mechanisms[J]. Progress in Energy and Combustion Science, 2019, 70: 212-259

[11] Xia YR, Chai WH, Liu YH, et al.. Facile Fabrication of Starch-Based, Synergistic Intumescent and Halogen-Free Flame Retardant Strategy with Expandable Graphite in Enhancing the Fire Safety of Polypropylene[J]. Industrial Crops and Products, 2022, 184: 1-11

[12] Zhang DH, Shang XY, Luo JY, et al.. Flame Retardancy Properties and Rheological Behavior of PP/DiDOPO Conjugated Flame Retardant Composites[J]. Frontiers in Chemistry, 2022, 10: 1-6

[13] Ghanadpour M, Carosio F, Ruda MC, et al.. Tuning the Nanoscale Properties of Phosphorylated Cellulose Nanofibril-Based Thin Films to Achieve Highly Fire-Protecting Coatings for Flammable Solid Materials[J]. ACS Applied Materials & Interfaces, 2018, 10(38): 32 543-32 555

[14] Jiang L, Gao M, Xiao L, et al.. Improving the Flame Retardancy Efficiency and Mechanical Properties of the Intumescent Flame Retarded Low-Density Polyethylene by the Dual Actions of Polyurea Microencapsulation and Aluminum Hypophosphite[J]. Journal of Applied Polymer Science, 2023, 140(10): 1-13

[15] Liu Z, Wu W, Wu W, et al.. Synthesis of a Triazine-Based Macromolecular Hybrid Charring Agent Containing Zinc Borate and Its Flame Retardancy and Thermal Properties in Polypropylene[J]. International Journal of Polymer Analysis and Characterization, 2020, 25(5): 334-342

[16] Xu Y, Zhou R, Mu J, et al.. Synergistic Flame Retardancy of Linear Low-Density Polyethylene with Surface Modified Intumescent Flame Retardant and Zinc Borate[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2022, 640: 128 400

[17] Ai LH, Liu JB, Chen SS, et al.. Synthesis of Melamine Phenyl Hypophosphite and Its Synergistic Flame Retardance with SiO₂ on Polypropylene[J]. Journal of Thermal Analysis and Calorimetry, 2022, 147(11): 6 207-6 217

[18] Liu JB, Zeng LJ, Ai LH, et al.. Preparation of Melamine Borate Coated Red Phosphorus Microcapsules and Use of Zinc Borate as Synergistic Flame Retardant in Polyethylene[J]. Journal of Vinyl and Additive Technology, 2022, 28(3591-603

[19] Lu SK, Liu JB, Zeng LJ, et al.. Preparation and Characterization of Cyclodextrin Coated Red Phosphorus Double-Shell Microcapsules and Its Application in Flame Retardant Polyamide6[J]. Polymers, 2022, 14(19): 1-13

[20] Zeng LJ, Yang L, Ai LH, et al.. Synergistic Flame Retardant Effect of Ammonium Polyphosphate and Aluminum Hydroxide on Polyurethane [J]. Journal of Wuhan University of Technology-Materials Science Edition, 2022, 37(3): 533-539

[21] Zhang T, Liu WS, Wang MX, et al.. Synthesis of a Boron/Nitrogen-Containing Compound Based on Triazine and Boronic Acid and Its Flame Retardant Effect on Epoxy Resin[J]. High Performance Polymers, 2017, 29(5): 513-523

[22] Chen SS, Ai LH, Zhang T, et al.. Synthesis and Application of a Triazine Derivative Containing Boron as Flame Retardant in Epoxy Resins[J]. Arabian Journal of Chemistry, 2020, 13(1): 2 982-2 994

[23] Li MH, Bai Y, Hao EQ, et al.. Optimization of Intumescent Flame Retardant System Based on Ammonium Polyphosphate, Double Pentaerythritol, and Zinc Borate for Thermoplastic Polyurethane Composite [J]. Journal of Applied Polymer Science, 2024, 141(16): 1-12

[24] Ai LH, Liu JB, Chen SS, et al.. Synthesis of Melamine Phenyl Hypophosphite and Its Synergistic Flame Retardance with SiO₂ on Polypropylene[J]. Journal of Thermal Analysis and Calorimetry, 2022, 147(11): 6 207-6 217

[25] Hu L, Wang Z, Zhao Q. Flame Retardant and Mechanical Properties of Toughened Phenolic Foams Containing a Melamine Phosphate Borate[J]. Polymer-Plastics Technology and Engineering, 2017, 56(6): 678-686

[26] Chen SS, Ai LH, Zeng JM, et al.. Synergistic Flame-Retardant Effect of an Aryl Boronic Acid Compound and Ammonium Polyphosphate on Epoxy Resins[J]. Chemistryselect, 2019, 4(33): 9 677-9 682

[27] Ai LH, Chen SS, Yang L, et al.. Synergistic Flame Retardant Effect of Organic Boron Flame Retardant and Aluminum Hydroxide on Polyethylene[J]. Fibers and Polymers, 2021, 22(2): 354-365

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Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature