Sunshine Factory, Co., Ltd. > Applications > ZrP for PolymerZrP for Polymer
A new technoloy for effectively enhancing the flame retardancy of silicone rubber
Functionalized zirconium phosphate(F-ZrP) was prepared by intercalating1,2,2,6,6-pentamethyl-4-(vi-nyldiethoxysiloxy) piperidine(PMVP) into α-zirconium phosphate(α-ZrP), and was used to to flame retardancy of addition-cure liquid silicone rubber(ALSR).
Experimental
1.Schematic illustration for preparation of the ALSR/F-ZrP nanocomposite: (a) synthesis reaction of PMVP, (b) intercalation process for F-ZrP, (c) hydrosilylation reaction for ALSR/F-ZrP nanocomposite.
2.Flame retardancy of ALSR and its composites.
3.The video snapshots of ALSR (a) and ALSR/F-ZrP composite (b) during the UL-94 test.
Conclusion
Functionalized zirconium phosphate was successfully prepared by intercalating PMVP into α-ZrP.The flame retardancy of ALSR was improved significantly after incorporating F-ZrP.When only 4.0 phr of F-ZrP was added,the flame retardant ALSR could pass the UL-94V-0 rating,and the LOI value was increased from 28.0% to 31.0%.Moreover, compared to ALSR, the peak heat release rate (PHRR) and the total heat release (THR) of ALSR/F-ZrP decreased by 54.2% and 47.5%, respectively. the tensile strength of ALSR increased from 7.62 MPa to 8.35 MPa, and the tear strength of ALSR increased from 20.6 kN m1 to 26.0 kN m1. The reason might be attributed to the improved interfacial interactions and dispersion of ZrP nanoplatelets in ALSR.
(Contents lists available at ScienceDirect)
Experimental
1.Schematic illustration for preparation of the ALSR/F-ZrP nanocomposite: (a) synthesis reaction of PMVP, (b) intercalation process for F-ZrP, (c) hydrosilylation reaction for ALSR/F-ZrP nanocomposite.
2.Flame retardancy of ALSR and its composites.
3.The video snapshots of ALSR (a) and ALSR/F-ZrP composite (b) during the UL-94 test.
Conclusion
Functionalized zirconium phosphate was successfully prepared by intercalating PMVP into α-ZrP.The flame retardancy of ALSR was improved significantly after incorporating F-ZrP.When only 4.0 phr of F-ZrP was added,the flame retardant ALSR could pass the UL-94V-0 rating,and the LOI value was increased from 28.0% to 31.0%.Moreover, compared to ALSR, the peak heat release rate (PHRR) and the total heat release (THR) of ALSR/F-ZrP decreased by 54.2% and 47.5%, respectively. the tensile strength of ALSR increased from 7.62 MPa to 8.35 MPa, and the tear strength of ALSR increased from 20.6 kN m1 to 26.0 kN m1. The reason might be attributed to the improved interfacial interactions and dispersion of ZrP nanoplatelets in ALSR.
Flame retardant mechanism :
F-ZrP was mainly attributed to the synergism of the catalyzing carbonization and free-radical quenching effects. On the one hand, PMVP suppressed the thermal degradation of silicone chains in the condensed phase and quenched the active free-radicals in the gas phase by generating nitroxyl radicals. On the other hand, F-ZrP promoted silicone chain self-crosslinking and the formation of the graphitized carbons, resulting in the formation of the compact and thermostable ceramic layer, which was good barrier to protect the underlying matrix and inhibit the exchange of degradation products and oxygen.
(Contents lists available at ScienceDirect)
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