植酸具有优异的耐火性和亲水性,通过在水溶液中合成植酸锡并将其沉积在氢氧化镁(MH)表面,制备出植酸锡包覆氢氧化镁阻燃剂,引入植酸锡生物质类阻燃剂能够提高MH的阻燃性。将MH、植酸锡和氢氧化镁混合物(PA-Sn/MH)及植酸锡包覆氢氧化镁(PA-Sn@MH)这3种阻燃剂通过原位聚合法添加到聚脲(PUA)基体中,制备聚脲复合材料。结果表明:PA-Sn@MH阻燃剂对聚脲复合材料的阻燃性能有明显改善,纯PUA的极限氧指数(LOI)为19.7%,PUA/10% PA-Sn@MH的LOI可提高至26.9%。纯PUA峰值放热率为680.73MJ/m2,PUA/10% PA-Sn@MH峰值放热率可降至640.52MJ/m2。此外,植酸锡的引入明显地改善了MH在聚脲基体中的相容性。
Phytic acid has excellent fire resistance and hydrophilicity.By synthesizing tin phytate(PA-Sn) in aqueous solution and depositing it on the surface of magnesium hydroxide(MH),tin phytate coated magnesium hydroxide(PA-Sn@MH) flame retardant was prepared.Introduced tin phytate biomass class flame retardants can improve the flame retardancy of magnesium hydroxide.Three flame retardants,magnesium hydroxide (MH),tin phytate and magnesium hydroxide mixture (PA-Sn/MH),and tin phytate coated magnesium hydroxide (PA-Sn@MH) were added by in-situ polymerization into a polyurea (PUA) matrix,a polyurea composite was prepared.The results shown that PA-Sn@MH can significantly improve the flame retardant properties of PUA composites.The limiting oxygen index (LOI) of pure PUA was 19.7%,and the LOI of PUA/10% PA-Sn@MH can be improved to reach 26.9%.The peak heat release rate of pure PUA was 680.73MJ/m2,and the peak heat release rate of PUA/10% PA-Sn@MH can be reduced to 640.52MJ/m2.In addition,the introduction of tin phytate significantly improved the compatibility of MH in the PUA matrix.
[1] Zhang T,Cai W,Chu F K,et al.Hydroxyapatite/polyurea nanocomposite:preparation and multiple performance enhancements[J].Composites Part A:Applied Ence and Manufacturing,2020,128:105681.
[2] Iqbal N,Tripathi M,Parthasarathy S,et al.Polyurea coatings for enhanced blast-mitigation:a review[J].RSC Advances,2016,6(111):109706-109717.
[3] Iqbal N,Kumar D,Roy P K.Emergence of time-dependent material properties in chain extended polyureas[J].Journal of Applied Polymer Science,2018,135(40):46730.
[4] Zhang N,Liu X,Huang Y,et al.Novel nanocomposites of cobalt ferrite covalently-grafted on graphene by amide bond as superior electromagnetic wave absorber[J].Journal of Colloid and Interface Science,2019,540:218-227.
[5] Romanov S V,Panov Y T,TimakovaI K A.Polyureas-a new promising class of binders for adhesives,sealants,and coatings[J].Polymer Ence,2013,6(3):175-180.
[6] Li T,Xie Z N,Jun X,et al.Design of a self-healing cross-linked polyurea with dynamic cross-links based on disulfide bonds and hydrogen bonding[J].European Polymer Journal,2018,107:249-257.
[7] Qian X D.Functionalized graphene with DOPO based organic/inorganic flame retardants:preparation and its reinforcements on the flame retardancy of polyurea composites[J].Polymer Composites,2018,39(12):4637-4645.
[8] Qian X D,Song L,Wang B B,et al.Synthesis of organophosphorus modified nanoparticles and their reinforcements on the fire safety and mechanical properties of polyurea[J].Materials Chemistry & Physics,2013,139(2-3):443-449.
[9] Meng W H,Dong Y L,Li J H,et al.Bio-based phytic acid and tannic acid chelate-mediated interfacial assembly of Mg(OH)2 for simultaneously improved flame retardancy,smoke suppression and mechanical properties of PVC[J].Composites Part B:Engineering,2020,188:105681.
[10] He J N,Zeng W,Shi M M,et al.Influence of expandable graphite on flame retardancy and thermal stability property of unsaturated polyester resins/organic magnesium hydroxide composites[J].Journal of Applied Polymer Ence,2020,137(1):47881.
[11] Zhou R,Ming Z,He J P,et al.Effect of magnesium hydroxide and aluminum hydroxide on the thermal stability,latent heat and flammability properties of paraffin/HDPE phase change blends[J].Polymers,2020,12(1):180.
[12] Chen X L,Wu H,Luo Z,et al.Synergistic effects of expandable graphite with magnesium hydroxide on the flame retardancy and thermal properties of polypropylene[J].Polymer Engineering & Ence,2010,47(11):1756-1760.
[13] Gul R,Islam A,Yasin T,et al.Flame-retardant synergism of sepiolite and magnesium hydroxide in a linear low-density polyethylene composite[J].Journal of Applied Polymer nEce,2011,121(5):2772-2777.
[14] Ye L,Miao Y Y,Yan H,et al.The synergistic effects of boroxo siloxanes with magnesium hydroxide in halogen-free flame retardant EVA/MH blends[J].Polymer Degradation & Stability,2013,98(4):868-874.
[15] Li Z Z,Qu B J.Flammability characterization and synergistic effects of expandable graphite with magnesium hydroxide in halogen-free flame-retardant EVA blends[J].Polymer Degradation & Stability,2003,81(3):401-408.
[16] Wang X,Romero M Q,Zhang X Q,et al.Intumescent multilayer hybrid coating for flame retardant cotton fabrics based on layer-by-layer assembly and sol-gel process[J].RSC Advances,2015,5(14):10647-13655.
[17] Chen X W,Guan J P,Chen G Q,et al.Adsorption and flame retardant properties of bio-based phytic acid on wool fabric[J].Polymers,2016,8(4):122.
[18] Bebot-Brigaud A,Dange C,Fauconnier N,et al.31P-NMR,potentiometric and spectrophotometric studies of phytic acid ionization and complexation properties toward Co2+,Ni2+,Cu2+,Zn2+ and Cd2+[J].Journal of Inorganic Biochemistry,1999,75(1):71-78.
[19] Kalali E N,Wang X,Wang D Y.Synthesis of Fe3O4 nano-sphere@MgAl layered double hydroxide hybrid and application in fabricating multifunctional epoxy nanocomposites[J].Industrial & Engineering Chemistry Research,2016,55(23):6634-6642.
[20] Cheng L Y,Wu W H,Meng W H,et al.Application of metallic phytates to poly(vinyl chloride) as efficient biobased phosphorous flame retardants[J].Journal of Applied Polymer Science,2018,135(33):46601.
[21] Rosely C V S,Joseph A M,Leuteritz A,et al.Phytic acid modified boron nitride nanosheets as sustainable multifunctional nanofillers for enhanced properties of poly(L-lactide)[J].ACS Sustainable Chemistry & Engineering,2020,8(4):1868-1878.
[22] Zhu W J,Yang M Y,Huang H,et al.A phytic acid-based chelating coordination embedding structure of phosphorus-boron-nitride synergistic flame retardant to enhance durability and flame retardancy of cotton[J].Cellulose,2020,27(8):4817-4829.
[23] Chin D C H,Palaniandy K,Hia I L,et al.High performance aliphatic polyurea films reinforced using nonfunctionalized multiwalled carbon nanotubes[J].Polymer Composites,2020,41(3):1036-1044.
[24] Iqbal N,Tripathi M,Parthasarathy S,et al.Polyurea spray coatings:tailoring material properties through chemical crosslinking[J].Progress in Organic Coatings,2018,123:201-208.
[25] Tang X,Zhang X,Chen Y Q,et al.Ultraviolet irradiation assisted liquid phase deposited titanium dioxide (TiO2)-incorporated into phytic acid coating on magnesium for slowing-down biodegradation and improving osteo-compatibility[J].Materials Ence and Engineering:C,2020,108:110487.
[26] Wang Z Z,Qu B J,Fan W C,et al.Combustion characteristics of halogen-free flame-retarded polyethylene containing magnesium hydroxide and some synergists[J].Journal of Applied Polymer Ence,2010,81(1):206-214.
[27] Rothon R N,Hornsby P R.Flame retardant effects of magnesium hydroxide[J].Polymer Degradation and Stability,1996,54(2-3):383-385.
