Preparation And Properties Of Intumescent Flame Retardant Styrene-butadiene Rubber And EPDM/Polypropylene Composites

Intumescent flame retardant(IFR) is a new type of halogen-free flame retardant and has played an important role in improving the flame retardancy. IFR are generally used in polymers because of their high efficiency, low dose levels, low smoke and non-toxic and so on. In this paper, the development of flame retardant styrene butadiene rubber(SBR) and EPDM/PP as well as the research progress of flame retardant were explored based on the related work in our laboratory and literatures. SBR and EPDM/PP were used as matrix and the typical IFR system which APP/PER were chosen as flame retardant to prepare intumescent flame retardant materials. The thermal stability and flame retardant properties of the materials were investigated. The study focused on the effect of some compounds used as the synergists and the synergistic mechanism as well as its thermal stability were discussed.With the development of the application of rare earth elements, it has been widely used in the fields of electronics, energy, light industry, petrochemicals, machinery, environmental friendly, agriculture and other fields. Especially with the study and application of the modern functional materials, the rare earth elements have become essential raw materials. In this paper, the effect of cerium phosphate on combustion and mechnical properties of SBR and EPDM/PP composites was studied. The experimental results showed that the rare earth phosphate promoted the vertical flame rating improvement on SBR and EPDM/PP, lowered the heat release rate and improved the mechanical properties. The rare earth phosphate is a excellent synergistic agent.The main research work in this paper as followed:1. In order to solve the poor water resistance of IFR, the microencapsulated technology was used, which is wrapped APP in PU resin. In this paper, the mixture of APP (or PUMAPP) and PER was used to flame retard SBR. The SBR composites were prepared. And the flame retardant properties were measured by the LOI and UL94. From the result of TGA, it found that the addition of IFR improved the thermal stability of SBR at high temperature and greatly increase the amount of char residue. From FTIR results, it found that there is a stable carbon layer formed which contained mostly phosphorus at the high temperature. The combustion properties, mechanical properties and water-soluble were studied. It found that adding the same amount of APP and PUMAPP, the performance of SBR with PUMAPP is better than that with APP. The main reason may be related with the interface and dispersion of APP after microcapsuled.2. The IFR system composed with APP and PER, which consisted of CeP(IV) were added into the SBR. The flame retardant propertis of SBR were investigated under different amounts of CeP(IV) using LOI and UL94. At the same time, the TGA was used to investigate the effect of synergistic agent to thermal decomposition of SBR under air atmosphere. The thermal degradation behavior of SBR composites is investigated using FTIR. To further analyze how the structure of intumescent charred layer determines flame retardancy of SBR, the morphologies of the charred layers were examined by SEM.3. In the preparation of EPDM/PP system, the CeP and Fe-MMT were used. And their synergist effect was studied. The flame retardant properties and thermal stability of EPDM/PP was observed using the LOI, UL-94 and TGA. SEM was used to investigate the morphological structure of the char layer. It had been found that the addition of synergistic agent into the EPDM/PP/APP/PER composites has better flame retardancy. In this paper, the effect between synergistic agent and intumenscent flame retardant system was studied.