Influencing mechanism and interaction of muscovite on thermal decomposition of ammonium polyphosphate

Abstract

The interaction mechanism and phase evolution of ammonium polyphosphate (APP) mixed with muscovite (APP/muscovite) were studied by TG, XRD and SEM, respectively, during heating. When the temperature is not higher than 300 °C, muscovite has no effect on the thermal decomposition of APP, and the initial decomposition temperature of APP/muscovite at 283 °C is basically the same as the APP at 295 °C, and the main thermal decomposition products are polyphosphoric acid and NH₄H₂PO₄ at 300 °C. The polyphosphoric acid, the decomposition products of APP, can enable K and Si out of muscovite and interact with muscovite chemically to generate Al₂O₃·2SiO₂, α-SiO₂ and phosphates (AlPO₄ and K₅P₃O₁₀) compounds during 400 °C-800 °C, which own obvious adhesive phenomenon and porous structure with the apparent porosity of 58.4%. Further reactions between phosphates other than reactions among Al₂O₃·2SiO₂ and α-SiO₂ can generate KAlP₂O₇ at 1 000 °C and the density of residual product is improved by low melting point phosphate filling pore to form relatively dense structure and decrease the apparent porosity to 44.4%. The flame resistant and self-supported ceramic materials are expected to enhance the fire-retarding synergistic effect between APP and muscovite.

Keywords

ammonium polyphosphate (APP) / muscovite / thermal decomposition / influencing mechanism / interaction

References

[1] Chattopadhyay DK, Webster DC. Thermal Stability and Flame Retardancy of Polyurethanes[J]. Progress in Polymer Science, 2009, 34(2): 1068-1133.

[2] Samyn F, Bourbigot S, Jama C, et al. Characterisation of the Dispersion in Polymer Flame Retarded Nanocomposites[J]. European Polymer Journal, 2008, 44(6): 1631-1641.

[3] Xia Y, Jian XG, Li JF, et al. Synergistic Effect of Montmorillonite and Intumescent Flame Retardant on Flame Retardance Enhancement of ABS[J]. Polymer-plastics Technology and Engineering, 2007, 46(3): 227-232.

[4] Levchik SV, Levchik GF, Camino G, et al. Mechanism of Action of Phosphorus Based Flame Retardants in Nylon6 Ammonium Polyphosphate Talc[J]. Journal of Fire Sciences, 1995, 13(1): 43-58.

[5] Wei P, Wu D, Zhong HF, et al. Effect of Flame Retardant Containing Phosphorus and Silicone on Thermal Performance of PC/ABS[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2009, 24(2): 235-240.

[6] Mansouri J, Chris A, Katherine R, et al. Investigation of the Ceramifying Process of Modified Silicone-silicate Compositions[J]. Journal of Materials Science, 2007, 42(15): 6046-6055.

[7] Hanu LG, Simon GP, Cheng YB. Thermal Stability and Flammability of Silicone Polymer Composites[J]. Polymer Degradation and Stability, 2006, 91(3): 1373-1379.

[8] Mansouri J, Burford RP, Cheng YB. Pyrolysis Behaviour of Siliconebased Ceramifying Composites[J]. Materials Science and Engineering A, 2006, 425(1): 7-14.

[9] Hamdani S, Longuet C, Perrin D, et al. Flame Retardancy of Siliconebased Materials[J]. Polymer Degradation and Stability, 2009, 94(2): 465-495.

[10] Alexander G, Cheng YB, Burforda RP, et al. Ceramifying Composition for Fire Protection[P], 2007

[11] Hanu LG, Simon GP, Mansouri J, et al. Development of Polymerceramic Composites for Improved Fire Resistance[J]. Journal of Materials Processing Technology, 2004, 153-154(1): 401-407.

[12] Zynab AH. Ceramifiable Polymer Composites for Fire Protection Application[D], 2007

[13] Zhang LY, Wei TT, Chen HJ, et al. Mechanical and Thermal Properties of Muscovite and Density Polyethylene-reinforced and -toughened Polypropylene Composites[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2009, 24(2): 581-587.

[14] Jiang WZ, Hao JW, Han ZD. Study on the Thermal Degradation of Mixtures of Ammonium Polyphosphate and a Novel Caged Bicyclic Phosphate and Their Flame Retardant Effect in Polypropylene[J]. Polymer Degradation and Stability, 2012, 97(3): 632-637.

[15] Ubirajara AP, Leila YV, Jorge G, et al. Flame Retardancy in Thermoplastic Polyurethane Elastomers (TPU) with Mica and Aluminum Trihydrate (ATH)[J]. Polymer Degradation and Stability, 2000, 69(3): 257-260.

[16] Wang DQ, Wang FY, Wang GX, et al. XRD Characteristics of Muscovites with Different Potassium Contents[J]. Geotectonica et Metallogenia, 2004, 28(1): 69-73.

[17] Castrovinci A, Camino G, Drevelle C, et al. Ammonium Polyphosphate Aluminum Trihydroxide Antagonism in Fire Retarded Butadienestyrene Block Copolymer[J]. European Polymer Journal, 2005, 41(9): 2023-2033.

[18] Cinausero N, Azema N, Cuest L, et al. Synergistic Effect Between Hydrophobic Oxide Nanoparticles and Ammonium Polyphosphate on Fire Properties of Poly (methyl methacrylate) and Polystyrene[J]. Polymer Degradation and Stability, 2011, 96(4): 1445-1454.

[19] Zhou Y, Hao JW, Liu GS, et al. Influencing Mechanism of Transition Metal Oxide on Thermal Decomposition of Ammonium Polyphosphate[J]. Chinese Journal of Inorganic Chemistry, 2013, 29(6): 1115-1122.

[20] Kissinger HE. Reaction Kinetics in Differential Thermal Analysis[J]. Analytical Chemistry, 1957, 29(11): 1702-1706.

[21] Zhou J. Study on the Thermal Decomposition Kinetics Models of Ammonium Polyphosphate[J]. Journal of Chinese People’s Armed Police Force Academy, 2009, 25(10): 12-15.