Study On Non-Halogen Flame-Retardant Polyethylene Composites

The research on the use of magnesium hydroxide(MH) as a main flame retardant in high density polyethylene (HDPE) was performed. The flame retardant property and mechanical property of HDPE/MH were studied. It has been found that more than 60% by weight of MH is required to obtain an adequate level of flame retardant property of HDPE, and such high loading levels of MH damage the mechanical properties of the filled materials seriously. What I do to make the composites of HDPE/MH used in our lives is:One is to enhance efficiency of flame retardant. Firstly, the study of the great synergistic effect between MH and some other halogen-free flame retardant, such as ATH, zinc borate(ZB), red phosphorous(RP), ammonium polyphosphate (APP)was conducted; secondly, the typical system of intumescent fire retardant-APP-PER (pentaerythritol) was used to hold back the combustion of HDPE. The optimum proportion of APP/PER/ZEO (zeolite), which is 21.4:7.4:1.5, was obtained.Secondly, it is to reinforce mechanical properties of composites by surface modifiers, e.g. stearate acid or stearate salts, silane coupling agents, titanate coupling agents and reinforcing agents e.g. montmorillonite. A great increase of the elongation at break(EB) of the HDPE/MH composites with surface modifiers used was found compared with the composites without the modifiers. On the other hand, the use of stearate series and titanate coupling agents resulted in decreases in the tensile strenth(TS) of the composites. For the composites containing the silane coupling...