Preparation And Properties Of Low-smoke Poly (Vinyl Chloride) & Fire-retardant Silicone Rubber Based Cable Covering Materials

In order to protecting the natural environment from destruction or pollution, especially to sastify the requirements on fire safety, low-smoke, low-toxicity and flame retardant cable covering materials are one of the focus researches in recent years. Based on the recent literatures, the latest progresses were reviewed in this dissertation in the fields of smoke suppressant and flame retardant of Poly (vinyl chloride) (PVC) cable materials; non-halogen flame retardant of silicone rubber cable materials. In this thesis, the preparation and characterization of zinc hydroxystannate (ZnSn(OH)₆, ZHS), ZHS coated magnesium hydroxide (MH) and calcium carbonate(CaCO₃) were described. Fire retardant (FR) properties have been measured and compared for unfilled and filled polyvinyl-chloride (PVC) based cable formulations containing various amounts of fillers mentioned above compared with antimony trioxide (AO)-traditional flame retardant for PVC. Halogen free flame retardant silicone rubber or silicone rubber/clay nanocomposites based cable composites using MH and aluminium hydroxide (ATH) as a flame retardant, combined with zinc borate (ZB) and microencapsulated red phosphorous (MRP) as a synergist were prepared. Their mechanical properties and fire properties were studied using tensile test and LOI, UL 94 V, TGA. All the results were fed back to cable material design to promote development of superior fire safe cable materials.There are mainly containing four parts included in this paper.1. Study on flame retardant and smoke suppressant effect of ZHS for PVC based cable covering materials. ZHS has been obtained through a simple method by hydrolyzation of Sn⁴⁺ reacting with Zn²⁺ in aqueous and solid sodium hydroxide (NaOH) act as precipitator. The products were characterized by X-ray diffraction (XRD) patterns, Fourier transfer infrared (FTIR) spectra and thermogravimetric analysis (TGA), the influence factors of the experimental conditions for reaction temperature and pH value were investigate systematically and the optimum experimental conditions were presented. The transmission electron microscopy (TEM) images testified that the phase obtained has an cubic-type structure and grow into...