Study On Halogen - Free Flame Retardant POE / LLDPE - Based Cable Material And Effect Of Electron Beam Radiation On Its Performance

With the continuously expand of the material processing field, high demand of the material performances were in great need. There are many ways such as radiation crosslinking, silane crosslinking modification of water, peroxide crosslinking to improve the properties. With which method, various properties can be changed, for example, mechanical properties, corrosion resistance, ozone resistance, resistance to environmental stress cracking and creep properties. Because of its unique advantages, the electron beam radiation modification gradually get more extensive popularization and application. In addition, due to the increase awareness of environmental protection, making an advancement of non-halogenated flame retardant becomes more and more important.Halogen-free flame retardant in combination with electron beam irradiation has been a lot of exploration. Firstly, we choose copolymer (POE)/linear low density polyethylene (LLDPE)as matrix resin, Aluminum hydroxide (ATH) and novel N-P macromolecular material (NPS) as flame retardants, maleic anhydride graft copolymer as phase compatibilizer, and coupling agents as a surface modifying agent. Then, the EB radiation of POE/LLDPE based flame retardant material was studied, the impacts of increased radiation were discussed in detail, which provided a theoretical basis for further application of EB irradiation in fire-retardant materials industry.(1) Select POE/LLDPE binary blend as matrix material to analyze mechanical properties, processing flow properties and compatibility of the two phases. The results show that the blend has a good comprehensive performance; ATH can be flame retardant blends, but flame retardant efficiency is low, when added ATH 200phr, LOI was 29.5%, UL-94 flame rating for FV-1; MAH can significantly improve mechanical properties of blends and the dispersion of ATH. However, the blends will increase work ability with increasing amounts;(2) Compared ATH, NPS and the complex effects for flame retardant POE/LLDPE composites modified, when NPS and ATH were added 120phr, LOI reached 38% and 24%; The part of ATH doping in NPS (NPS/ATH was 100/20), ATH and NPS will produce a synergistic flame retardant, making the initial decomposition temperature of blends increased, carbon layer structure become more dense and high-temperature thermal stability would be enhanced; Storage modulus and loss modulus increases with increasing frequency, the attendant reduction in viscosity. All samples showed a clear tendency to shear thinning; Because of the uneven inorganic particles made between the addition of ATH material Tg is lower than the addition of NPS material Tg;(3) POE/LLDPE-based flame retardant material after EB irradiation, when the irradiation lose is low, intermolecular crosslinking chains produced, the segment transition slack becomes difficult, thereby exhibiting Tg increases, E’ decreases, TS increases and the thermal stability improves at high temperature; when the irradiation lose is too high, the opposite phenomenon to the previous; This is consistent with the test result by Low-field NMR crosslinking density gauge, relaxation time (T2) can be reduced and then increased, anisotropy parameters (q) can be increased and then reduced, when radiation dose is close to 150KGy, T2 and q have a minimum and maximum value, indicating crosslinking density of flame material at optimum.