Enhanced flame retardancy of natural rubber composite with addition of microencapsulated ammonium polyphosphate and MCM-41 fillers

• Published in: Fire safety journal Vol. 62; pp. 281 - 288
• Main Authors: Wang, Na, Mi, Long, Wu, Yuxian, Wang, Xiangzhou, Fang, Qinghong
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2013; Elsevier
• Subjects: Applied sciences; Building technical equipments; Buildings; Buildings. Public works; DMTA; Exact sciences and technology; Fire behavior of materials and structures; Fire protection; Intumescent flame retardant; Materials; Miscellaneous (including polymer concrete, repair and maintenance products, etc.); Paints and renderings. Protection products; Physico-mechanical properties; Strength of materials (elasticity, plasticity, buckling, etc.); Structural analysis. Stresses; Synergism; Thermal stability; Physico-mechanical properties; Intumescent flame retardant; Synergism; DMTA; Thermal stability; Scanning electron microscopy; Ammonium phosphate; Mechanical properties; Flame retardant; Polymer; Natural rubber; Experimental study; Composite material; Characterization; Microencapsulation; Intumescent material; Filler
• ISSN: 0379-7112
• DOI: 10.1016/j.firesaf.2013.09.008

Microencapsulated ammonium polyphosphate with melamine-formaldehyde resin (MCMF-APP) prepared by in situ polymerization and characterized by FTIR showed decreased water solubility and particle size in comparison to bare ammonium polyphosphate. APP was used as additive to natural rubber (NR) together with mesoporous silica MCM-41 as a synergistic agent to form intumescent flame retardant composite in this study. The flame retardancies of NR/APP, NR/MCMF-APP and NR/MCMF-APP/MCM-41 composites were studied using limiting oxygen index (LOI) and UL-94 test, and their thermal stability was evaluated by thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis (DMTA) as well as physico-mechanical properties. The results indicated that the LOI value of NR/MCMF-APP composite was higher than those of NR/APP composite and NR. Addition of MCM-41 into NR/MCMF-APP composite further increased the LOI values and also increased the UL-94 ratings of most ternary composites to V-0 due to a synergistic effect between MCM-41 and MCMF-APP in NR composites. As the results showed, the thermal stability and flame retardancy of NR were enhanced. ●Few paper has mentioned the FR property with microencapsulated IFR and MCM-41 in NR.●Synergistic effect was obtained with adding microencapsulated IFR and MCM-41.●NR/IFR/MCM-41 enhanced the property of mechanical, flame retardant and thermal.