Silicone rubber (SR) has excellent properties, such as high and low temperature resistance and weather resistance. However, the flame retardancy of SR is rather poor, which severely limits the range of application of SR. Therefore, it is necessary to make certain modifications in order to improve its flame retardancy. In this study, wollastonite, low-melting glass powder, and phytate-modified carbon nanotubes (CPCC) were added to SR to prepare ceramizable silicone rubber (CSR) composites with good fire safety performance. The effect of CPCC on the flame retardancy and ceramization properties of CSR materials was investigated. The results showed that, with the addition of 3 phr of CPCC, the limiting oxygen index of the CSR composite material reached 33.8%, which was 26.1% higher than that of pure SR, and its UL-94 grade reached V-0 grade. The results of the cone calorimeter test showed that the total heat release of the CSR composite with three parts CPCC was reduced by 26.6%, and the peak heat release rate reduced by 13.1%. In addition, after the CSR6 composite was calcined at 1000 degrees C for 1 h, the ceramic body formed by the composite had good supporting properties, and its bending strength was as high as 6.17 MPa. In order to improve the flame retardancy of silicone rubber (SR) composites, the surface of carbon nanotubes (CNTs) was first modified, and then, phytic acid and modified CNTs were doped with cobalt and copper ions to form complexes to prepare green and environmentally friendly composites. A new flame retardant phytate-modified carbon nanotubes (CPCC) was added to SR to prepare a flame-retardant ceramic silicone rubber composite. The peak heat release rate (pHRR) and total heat release (THR) of SR0 were 321.8 kW/m2 and 61.2 MJ/m2, respectively. After 3 phr, CPCC was added, and the pHRR and THR of CSR6 were 279.9 kW/m2 and 44.9 MJ/m2, 13.1% and 26.6% lower than those of SR0, indicating that the CPCC hybrid had a good flame-retardant effect on ceramized silicone rubber. image

In general, the addition of phosphate ester flame retardants can improve the flame retardancy of polymethyl methacrylate (PMMA), but the flame retardant efficiency is low when phosphate ester is used alone and the tensile strength and hardness of the material are reduced. It is a challenge to improve the flame retardancy of PMMA while maintaining its inherent mechanical properties. In this study, a polyphosphate-coated silica (SZP) was prepared, which was compounded with dimethyl methylphosphonate (DMMP). At the same time, methacrylamide (MAM), which can be copolymerized with PMMA, was introduced to construct a synergistic phosphorus-nitrogen-silicon flame retardant system. The three components can work together in the gas phase and condensed phase. The results showed that when 12.5% DMMP, 5% MAM and 2.5% SZP were added, the composite material had the best comprehensive performance, its limiting oxygen index (LOI) reached 25.1%, and its total heat release was only 70 % of the pure sample. More importantly, the addition of DMMP would significantly reduce the mechanical properties of PMMA. The introduction of SZP and MAM alleviated this problem. Compared with the pure sample, the mechanical properties of PMMA7 did not decrease but increased slightly. The flame retardant mechanism was also analyzed. This study provides a new idea for the industrialization of flame retardant PMMA.

Silicone rubber with its odorless and non-toxic, high and low temperature resistance and other advantages is widely used in many fields, but its shortcomings of flammability and low thermal conductivity limit its application and development. Therefore, the research on flame retardant and thermal conductive silicone rubber is practically valueable. In this study, iron oxyhydroxide (beta-FeOOH) was synthesized on carbon nanotubes (CNTs) by in situ growth and added to silicone rubber after surface modification with gamma-aminopropyltriethoxysilane (KH550). The results showed that the limiting oxygen index (LOI) of methyl vinyl silicone rubber (VMQ) with the addition of one part of KH550@CNTs-beta-FeOOH increased to 29.8%, its peak heat release rate (pHRR) and total heat release (THR) decreased by 40.1% and 30.2%, respectively, and its thermal conductivity increased to 0.3680 W/m & BULL;k. The flame-retardant performance and thermal conductivity of the VMQ composite were significantly improved. The improvement of its flame retardancy was mainly due to the catalytic carbonization of CNTs and beta-FeOOH, which promoted the formation of dense carbon layers. The carbon layer insulates the exchange of oxygen and combustible gases. In addition, the thermal conductive network constructed by KH550@CNTs-beta-FeOOH in the composite effectively improved the thermal conductivity of VMQ.

As one of the three general rubbers, styrene-butadiene rubber (SBR) is widely used in industrial products such as tires and cables. However, SBR has the disadvantages of flammability and low thermal conductivity, which limits its application in industry. In order to improve the flame retardancy and thermal conductivity of SBR, zinc hydroxystannate/boron nitride hybrids (ZHS@BN) were successfully prepared by in-situ growth on BN. ZHS@BN was successfully prepared as determined by Fourier transform infrared spectroscopy, x-ray diffraction, scanning electron microscopy and thermogravimetry. When 3 phr ZHS@BN and 12 phr aluminum diethylphosphinate (ADP) were added, the limiting oxygen index value of SBR composites reached 28.4%. Compared with pure SBR, their peak heat release rate and peak smoke release rate decreased by 59.2% and 50.6%, respectively. Through the analysis of the flame-retardant properties and carbon residue of the SBR composites, it was proved that there was a good synergy between ZHS@BN and ADP to improve the flame-retardant properties of SBR.

As one of the three general rubbers, styrene-butadiene rubber (SBR) is widely used in the manufacturing of tires and cables. However, due to its unsatisfactory performance of flame retardancy and thermal conductivity, its rang of application is limited. In order to improve SBR's flame retardancy and thermal conductivity, flame retardant and thermal conductive additive EG microcapsules (BN-PPEG) were prepared by doping boron nitride (BN) with 2-hydroxyethyl methacrylate phosphate (HEMAP) as shell. The results of Fourier transform infrared spectroscopy, x-ray diffraction, scanning electron microscope energy and TG showed that BN-PPEG was successfully prepared. The thermal conductivity of the SBR composite added with 15 phr BN-PPEG was 58.0% higher than that of pure SBR, and its limiting oxygen index (LOI) value reached 26.6%, which was 38.5% higher than that of pure SBR. The peak heat release rate (pHRR) of the composites was 53.9% lower than that of pure SBR. The main reasons were that the physical barrier of BN and EG, the phosphorous free radicals captured active free radicals generated by the decomposition of HEMAP when heated, and the carbonization of SBR was promoted by generated phosphoric acid, metaphosphoric acid and other substances.