Study On Ceramics And Flame Retardant Silicone Rubber Composites

The damage to the cable insulation caused by the occurrence of fire,and the secondary disaster caused by the exposure of the wires usually bring about huge economic losses.Wire and cable insulation materials are burned and cause short circuits,which can lead to serious electrical accidents.In this paper,a kind of porcelain fire retardant silicone rubber composite material can be prepared by adding functional fillers to methyl vinyl silicone rubber.The composite material has certain flame-retardant properties,and can be made into porcelain in the event of a fire,forming a hard structure capable of resisting a certain external force,avoiding the secondary short-circuit disaster caused by fire.Due to the simple preparation process,there are good prospects for development in related industries such as wire and cable.The modified reinforcing agent A,kaolin,reinforcing agent B and magnesia,zirconia,decabromodiphenyl ether,and hydroxy silicone oil were used as the porcelain-filled fillers,and were prepared through mechanical mixing and vulcanization with the silicone rubber matrix.Silicone rubber composites.The single-factor experiment was used to determine the optimal amount of each filler.Through orthogonal experiments,the mutual influence among various factors was analyzed,the best formula was obtained,and the performance of the composite material obtained under the optimal formulation conditions was tested.The study also explored the process of preparation of ultra-long nano-hydroxyapatite lines through a single-factor experiment to hydrothermal reaction method,and prepared ultra-long nano-apatite lines with superior performance.On the basis of the best formula,The ultra-long nano-hydroxyapatite line was added to prepare the porcelain-fired flame-retardant silicone rubber,and the performance of the prepared porcelain-fired silicone rubber was tested.The single-factor experiment and orthogonal experiment showed that the best composition of ceramic fillers was 15 parts of reinforcing agent A,18 parts of magnesium oxide,12 parts of wollastonite,20 parts of kaolin,and the amount of decabromodiphenyl ether.16 parts,10 parts of reinforcing agent B,and 10 parts of zirconia.The tensile strength of the specimen obtained under optimal conditions is 6.24MPa,elongation at break is 128%,and Shore A hardness is 54 degrees.After 72hours of hot air aging,the tensile strength was 5.95 MPa,the elongation at break was120%,the hardness was 58 degrees,and the mechanical properties changed little,indicating that the heat aging resistance was good.The vertical burning test showed that the flame retardant level of the composite silicone rubber material reached FV-0level,and it had a good self-extinguishing performance,achieving the flame retardant effect required by the flame retardant material.The compressive strengths of ceramics calcined at 600°C and 800°C were 3.07 MPa and 8.64 MPa,respectively.The volume resistivity of the composite silicon rubber materials and ceramics calcined at 600°C and 800°C were all higher than 10¹³?·cm,and the resistivity of the resistance materials required by the national standard was satisfied.By analyzing the SEM images of the calcined porcelain of the composite silicone rubber material,the melt produced by some of the fillers in the composite silicone rubber material helps the filler particles to adhere to each other,which helps to form the porcelain,and the composite silicone rubber material can be used under experimental conditions.Produce crystal transformation.With the eutectic reaction,the porcelain structure after calcination is compacted,so that the ceramic effect is better.By analyzing the XRD pattern of the composite silicon rubber material calcined into porcelain,the main components of the composite silicon rubber material calcined into porcelain are CaSiO3 and SiO2.At 800°C,the eutectic reaction of the composite silicone rubber material is significant.The weightlessness analysis showed that the main reason for the weight loss of the composite silicone rubber material was due to the high temperature thermal decomposition of the base silicone rubber.The calcined residue of the composite silicone rubber material is approximately 50%larger than the blank sample,which is greatly improved..The basic process conditions for the preparation of ultra-long nano-hydroxyapatite lines were obtained by single-factor experiments:aqueous solution of calcium chloride?0.220 g??20 ml?,aqueous solution of NaOH?1 g??20 ml?,and NaH2PO4·2H2O?0.280 g?of an aqueous solution?10 ml?;stirring was added dropwise to a mixture of solvent?12 g?and ethanol?12 g?,and the reaction was then transferred to a stainless steel hydrothermal reaction vessel.The hydrothermal reaction temperature was 170°C.20h.The ultra long nano-hydroxyapatite line obtained at this time was observed by scanning electron microscopy,and the aspect ratio was greater than 300.The ultra-long nano-hydroxyapatite line 10g is added to 220g of the best formula,the tensile strength of the prepared silicone rubber composite can reach 7.68MPa,the elongation at break 198%,the Shore A hardness 58 degrees,and the flame-retardant level Achieve FV-0 grade,and have better self-extinguishing performance.The compressive strengths of ceramics calcined at 600°C and 800°C were 4.12MPa and9.86MPa,respectively.Compared with silicone rubber composites without long ultralong nanohydroxyapatite lines,the overall performance was improved.The prepared porcelain fire-retardant silicone rubber material has good processing and forming properties without changing the processing and preparation process of the original silicon rubber.