비할로겐 M-P 난연제 제조 및 복합재료 응용 연구

In order to improve flame retardancy, the halogen free organic melamine phosphate(M-P) flame retardant was synthesized from melamine and phosphoric acid by the reaction of precipitation. The ignition test was carried out preparing hybrid flame retardant compound(HbFRC) consisting of organic M-P and inorganic Mg(OH)2 as a flame retardant in the polyolefin resins. The flame retardancy and mechanical properties of flame retardant aluminum composite panel(HbFRC-ACP) were performed to investigate the possibility of the composite material, which was contained M-P, as a inner core for HbFRC-ACP. For this study, the results of ignition test indicate that a char formation and drip suppressing effect, and combustion time reduced as the content of M-P increased. The limited oxygen index(LOI) values were measured 17.4vol% and 31.5vol% for LDPE only and HbFRC-3(M-P content: 15wt%), respectively. And it was verified that the HbFRC-3 was needed more oxygen quantity with the increase of M-P content when it combustion. Also, the results from thermogravimetric analysis were observed endothermic peak at 350℃ and 550℃, it was confirmed predominant thermal stability though the wide temperature range by the mixture of M-P and Mg(OH)2. The LDPE-ACP (using only LDPE as a inner core), 35.13kW/㎡ of heat release rate(HRR) and 13.43MJ/㎡ of total heat release(THR) were measured while the HbFRC-ACP, 10.44kW/㎡ of HRR and 1.84MJ/㎡ of THR were measured by results of cone calorimeter test. In case of HbFRC-ACP, the average gas emission amount of CO and CO2 could be decreased down to 25% and 20%, respectively, in comparison with LDPE-ACP. The mechanical properties such as tensile strength, bending strength and adhesion strength of HbFRC-ACP were revealed slightly high values 54N/㎟, 152N/㎟ and 120N/25mm, respectively, compared with LDPE-ACP. It was confirmed that flame retardancy was improved with the synergy effect because of char formation by M-P and hydrolysis by Mg(OH)2. The result of this study suggest that HbFRC can be applied for an adequate halogen free flame retardant composite material as a inner core for ACP.