CAJ | 학술논문

通过锥形量热器试验、热重分析、拉曼光谱分析、氧指数、垂直燃烧试验及流变性能测试,研究了氰尿酸三聚氰胺(MCA)和氢氧化镁在无卤阻燃乙烯-醋酸乙烯共聚(EVA)混合物中的协效阻燃作用.锥形量热器试验结果表明,一定量的MCA可明显延缓材料的点燃时间,降低热释放速率;垂直燃烧和氧指数试验结果显示,MCA可有效改善材料的熔体滴落性能,增强火焰的自熄能力,但会降低材料的氧指数;流变性能测试结果表明,MCA的加入可明显降低材料的熔体粘度,改善材料的可加工性;热重分析结果显示,MCA可延缓EVA树脂的热氧降解并能促进炭层的生成;拉曼光谱证明了阻燃材料形成的炭层具有类石墨结构.MCA与氢氧化镁的协效阻燃效果归因于惰性气体保护层和炭层的形成.
통과추형량열기시험、열중분석、랍만광보분석、양지수、수직연소시험급류변성능측시,연구료청뇨산삼취청알(MCA)화경양화미재무서조연을희-작산을희공취(EVA)혼합물중적협효조연작용.추형량열기시험결과표명,일정량적MCA가명현연완재료적점연시간,강저열석방속솔;수직연소화양지수시험결과현시,MCA가유효개선재료적용체적락성능,증강화염적자식능력,단회강저재료적양지수;류변성능측시결과표명,MCA적가입가명현강저재료적용체점도,개선재료적가가공성;열중분석결과현시,MCA가연완EVA수지적열양강해병능촉진탄층적생성;랍만광보증명료조연재료형성적탄층구유류석묵결구.MCA여경양화미적협효조연효과귀인우타성기체보호층화탄층적형성.
The synergistic effects and flame-retardant properties of melamine cyanurate (MCA) with magnesium hydroxide (MH) in halogen-free flame-retardant (HFFR) ethylene vinyl acetate copolymer (EVA) blends have been studied using the cone calorimeter test (CCT), thermogravimetric analysis (TGA), laser Raman spectroscopy (LRS), limiting oxygen index (LOI), UL-94 test, and measurements of rheological properties. The data obtained from CCT show that a suitable amount of MCA can prolong the ignition time and reduce the heat release rate. The UL-94 test proves that MCA can efficiently prevent the EVA/MH blends from dripping in a flame and improve the ability of extinguishing itself after ignition. However, the addition of MCA apparently reduces the LOI values of EVA/MH blends, but a suitable amount of MCA can apparently decrease the melt viscosity and thus improve the processability of EVA/MH blends. The TGA data indicate that MCA can retard the thermo-oxidative degradation of EVA by increasing the pyrolysis temperature and promote the formation of char layers. The LRS gives the evidence that the charred layers have the graphite-like structure. The enhanced flame-retardant properties of MCA in the EVA/MH blends can be described as the formation of inert gaseous protection layers around the EVA blends and its interaction with EVA to promote the formation of charred layers.