Abstract
In this paper, a novel modified magnesium hydroxide (MH) was successfully prepared with γ-(2,3-epoxypropoxy)propyl trimethoxysilane (KH-560) via the wet process. The optimum modification conditions were obtained as follows: KH-560 dosage of 1.0 wt% at 80 °C for 2 h. The modified MH encapsulated by melamine cyanurate (MCA) at the mass ratio was 1:3. Using polyamide-6 (PA6) as matrix, MCA-MH as flame retardant, a series of flame-retardant PA6/MCA-MH composites were prepared by melt blending and injection molding. The flame retardancy, thermal property, and mechanical properties of PA6/MCA-MH composites were investigated. The investigation results showed that MCA-MH could effectively suppress the melt-dipping behavior and reinforce flame retardancy of PA6. PA6/MCA-MH composites successfully passed the vertical combustion (UL-94) V-0 rating and limiting oxygen index (LOI) as high as 32.5% with the incorporation of 20 wt% of MCA-MH. The residues of the PA6/MCA-MH composites were increased with the increasing MCA-MH. What’s more, the mechanical properties of the composites were also enhanced because of MCA-MH had better compatibility and dispersion in the PA6 matrix compared with MH. Therefore, PA6/MCA-MH composites with excellent flame retardancy while have maintained optimal mechanical properties can be obtained.
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References
Sinitsin AN, Zuev VV (2016) Dielectric relaxation of fulleroid materials filled PA 6 composites and the study of its mechanical and tribological performance. Mater Chem Phys 176:152–160
Paran SMR, Naderi G, Ghoreishy MHR (2017) Microstructure and mechanical properties of thermoplastic elastomer nanocomposites based on PA6/NBR/HNT. Polym Compos 38:451–461
Butnaru I, Fern谩ndez-Ronco MP, Czech-Polak J, Heneczkowski M, Bruma M, Gaan S (2015) Effect of Meltable Triazine-DOPO additive on rheological, mechanical, and flammability properties of PA6. Polymers 7(8):1541–1563
Monti M, Tsampas SA, Fernberg SP, Blomqvist P, Cuttica F, Fina A, Camino G (2015) Fire reaction of nanoclay-doped PA6 composites reinforced with continuous glass fibers and produced by commingling technique. Polym Degrad Stab 121:1–10
Xiao X, Hu S, Zhai JG, Chen T, Mai Y (2016) Thermal properties and combustion behaviors of flame-retarded glass fiber-reinforced polyamide 6 with piperazine pyrophosphate and aluminum hypophosphite. J Therm Anal Calorim 125:175–185
Tamura K, Ohyama S, Umeyama K, Kitazawa T, Yamagishi A (2016) Preparation and properties of halogen-free flame-retardant layered silicate-polyamide 66 nanocomposites. Appl Clay Sci 126:107–112
Chen L, Wang YZ (2010) A review on flame retardant technology in China. Part I: development of flame retardants. Polym Adv Technol 21(1):1–26
Zhang J, Kong Q, Wang D et al (2018) Simultaneously improving the fire safety and mechanical properties of epoxy resin with Fe-CNTs via large-scale preparation. J Mater Chem 6(15):6376–6386
Zhang J, Kong Q, Yang L, Wang DY (2016) Few layered co(OH)2 ultrathin nanosheets based polyurethane nanocomposites with reduced fire hazard: from eco-friendly flame retardance to sustainable recycling. Green Chem 18(10):3066–3074
Kong Q, Sun Y, Zhang C, Guan H, Zhang J, Wang DY, Zhang F (2019) Ultrathin iron phenyl phosphonate nanosheets with appropriate thermal stability for improving fire safety in epoxy. Compos Sci Technol 182:107748
Kong Q, Wu T, Zhang H, Zhang Y, Zhang M, Si T, Zhang J (2017) Improving flame retardancy of IFR/PP composites through the synergistic effect of organic montmorillonite intercalation cobalt hydroxides modified by acidified chitosan. Appl Clay Sci 146:230–237
Kong Q, Wu H, Zhang H, Zhang X, Zhao W, Zhang J (2016) Effect of Fe-Montmorillonite on flammability behavior in polypropylene/magnesium hydroxide composites. J Nanosci Nanotechnol 16(8):8287–8293
Zhang T, Liu W, Wang M, Liu P, Pan Y, Liu D (2016) Synergistic effect of an aromatic boronic acid derivative and magnesium hydroxide on the flame retardancy of epoxy resin. Polym Degrad Stab 130:257–263
Zhang HY, Wang HQ, Wang HQ (2018) Flame retardant mechanism and surface modification of magnesium hydroxide flame retardant. IOP Conference Series: Earth and Environmental Science. Vol. 170. No. 3
Tang H, Chen K, Li X, Ao M, Guo X, Xue D (2017) Environment-friendly, flame retardant thermoplastic elastomer鈥搈agnesium hydroxide composites. Funct Mater Lett 10(04):1750042
Yang Y, Niu M, Li J, Xue B, Dai J (2016) Preparation of carbon microspheres coated magnesium hydroxide and its application in polyethylene terephthalate as flame retardant. Polym Degrad Stab 134:1–9
Guo J, Liu G, Guo Y, Tian L, Bao X, Zhang X, Yang B, Cui J (2019) Enhanced flame retardancy and smoke suppression of polypropylene by incorporating zinc oxide nanowires. J Polym Res 26(1)
Dian L, Yuan L, Yan S, Qi W (2019) The properties of flame retardant and heat conduction polyamide66 based on melamine cyanurate/aluminum diethylphosphinate/grapheme. J Polym Res 26:216
Huang H, Zhang K, Jiang J, Li J, Liu Y (2017) Highly dispersed melamine cyanurate flame-retardant epoxy resin composites. Polym Int 66(1):85–91
Feng X, Wang X, Cai W, Hong N, Hu Y, Liew KM (2016) Integrated effect of supramolecular self-assembled sandwich-like melamine cyanurate/MoS2 hybrid sheets on reducing fire hazards of polyamide 6 composites. J Hazard Mater 320:252–264
Li Y, Lin Y, Sha K, Xiao R (2017) Preparation and characterizations of flame retardant melamine cyanurate/polyamide 6 composite fibers via in situ polymerization. Text Res J 87(5):561–569
Yang YX, Li YC, Wang P et al (2016) Effect of talc on flame retardant property of PA6/MCA composites. Plastics Science and Technology 1:24
Wang LY, Wei SS, Yiu C et al (2016) Preparation of polyamide 6/silica modified melamine Cyanurate non-halogen flame retardant Nanocomposites by in situ polymerization. J Nanosci Nanotechnol 16(9):9919–9924
Lee IC, Ko JW, Park SH, Shin IS, Moon C, Kim SH, Kim YB, Kim JC (2016) Melamine and cyanuric acid co-exposure causes renal dysfunction and structural damage via MAPKs and mitochondrial signaling. Food Chem Toxicol 96:254–262
Wang NY, Liu ZQ, Li LJ, Zhu LX (2014) Surface modification of magnesium hydroxide by A-174 Silane. Adv Mater Res 881-883:1424–1430
Yang Z, Cai J, Zhou C, Zhou D, Chen B, Yang H, Cheng R (2010) Effects of the content of silane coupling agent KH-560 on the properties of LLDPE/magnesium hydroxide composites. J Appl Polym Sci 118(5):2634–2641
You YS (2007) Surface modification of ultrafine magnesium Hydrozide powder. China Powder Science and Technology
Asmarandei I, Fundueanu G, Cristea M et al (2013) Thermo- and pH-sensitive interpenetrating poly(N-isopropylacrylamide)/carboxymethyl pullulan network for drug delivery. J Polym Res 20(11):1–13
Cai J, Wirasaputra A, Zhu Y, Liu S, Zhou Y, Zhang C, Zhao J (2017) The flame retardancy and rheological properties of PA6/MCA modified by DOPO-based chain extender. RSC Adv 7(32):19593–19603
Bhudolia SK, Joshi SC (2018) Low-velocity impact response of carbon fibre composites with novel liquid Methylmethacrylate thermoplastic matrix. Compos Struct 203:696–708
Ge H, Tang G, Hu WZ, Wang BB, Pan Y, Song L, Hu Y (2015) Aluminum hypophosphite microencapsulated to improve its safety and application to flame retardant polyamide 6. J Hazard Mater 294:186–194
Xu T, Huang XA (2010) TG-FTIR investigation into smoke suppression mechanism of magnesium hydroxide in asphalt combustion process. J Anal Appl Pyrolysis 87(2):217–223
Xie H, Lai X, Li H, Zeng X (2016) Synthesis of a novel macromolecular charring agent with free-radical quenching capability and its synergism in flame retardant polypropylene. Polym Degrad Stab 130:68–77
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Zheng, T., Xia, W., Guo, J. et al. Modified magnesium hydroxide encapsulated by melamine cyanurate in flame-retardant polyamide-6. J Polym Res 27, 258 (2020). https://doi.org/10.1007/s10965-020-02229-8
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DOI: https://doi.org/10.1007/s10965-020-02229-8