The Effect Of Melamine Cyanurate/ Magnesium Hydroxide On Thermal Degradation Behaviour And Flame-retardant Properties Of Polyamide 6

The Nitrogen flame retardant is a kind of widely applied flame retardant. It is popular with such advantages: high effectively ability to dilute the combustible gas concentration, slow burn rate, low volatility, non-toxic, good compatibility with the polymer, high decomposition temperature and so on, Melamine cyanurate (MCA) is an important nitrogen flame retardant. But the nitrogen flame retardants and can not do any help to the formation of polyolefin materials, the protection of dense carbon layer, so effects of alone nitrogen flame retardant polyolefin is not satisfactory.In response to this problem adopted in this paper Melamine cyanurate (MCA) / magnesium hydroxide (MH) binary system instead of pure Melamine cyanurate (MCA) as a flame retardant, used for polyamide 6 (PA6) flame-retardant research, was successfully prepared an excellent flame resistance, thermal stability, high mechanical properties of a good non-halogen flame retardant polyolefin materialMCA / MH binary system of its good compatibility in the matrix uniformly dispersed in the polymer processing temperature did not decompose, as well as non-occurrence of chemical reactions between components, reducing the thermal stability of PA6 to achieve a more satisfactory flame-retardant effect. By TG, FTIR, SEM studies have shown that the MCA is easy to decompose to join reduces the thermal stability of the system, changing the system and the decomposition temperature, changing the path of the degradation of polyamide 6, generating triazine substances conducive to the improvement of flame-retardant system.MH was added to make a further decline in system thermal stability and early formation of heat-stable high-cyano-containing material and triazine substances. Such thermal stability of substances in the combustion process as the role of binder will be a close packing MH bonding together, MAC as well as the interaction between the MH and the MCA to improve the quality of the carbon layer increased the carbon into the effect of increasing the rate of carbon into the combustion system is conducive to the improvement of fire retardant, so that condensed carbon layerflame-retardant barrier structure is possible. MCA experiments show that MCA/PA6 system is less than 30% of the content can not be flame-retardant UL-94 test system.MCA/MH/PA6 ternary system MCA for a fixed 15%, MH content of more than 20% of ternary blends of up to a vertical combustion properties of UL-94 V-0. MCA/MH synergistic mixture of carbon into the system to achieve a more satisfactory flame-retardant effect. In addition, because MCA can self-assemble into a network structure,and PA6 has a good compatibility, material strength and toughness can be improved.