纳米ZnO对膨胀型阻燃涂料阻燃及抑烟性能的影响

Effect of nano-zno on flame retardancy and smoke suppression of expansive flame retardant coatings

为提高膨胀型阻燃涂料的阻燃抑烟性能,以硅烷偶联剂KH550对纳米Zn O进行改性处理,通过锥形量热仪、扫描电子显微镜、红外光谱仪、同步热分析仪及热解动力学定量分析,探讨了不同掺量改性纳米Zn O对硅丙乳液基膨胀型阻燃涂料性能的影响。结果表明,掺入2%的改性纳米Zn O涂层的阻燃抑烟性能最佳;纳米Zn O能够促进膨胀阻燃体系在燃烧过程中的交联和炭化反应,提高涂层的热稳定性和成炭率,但是掺入过量会破坏有效的炭层结构,影响其阻燃性;通过改进的Coats-Redfern积分方法,阐明了3D Jander模型(n=2)主要控制涂层的整个热解过程,掺杂2%的纳米ZnO使涂层在370~430℃的E从159.09 kJ/mol提高到182.05 kJ/mol。

In order to improve the expansion type flame retardant coatings of flame retardant and smoke suppression performance with silane coupling agent KH550 as modification of nanometer ZnO by cone calorimeter(dexa),scanning electron microscope,infrared spectrometer,synchronous thermal analyzer and pyrolysis kinetics of quantitative analysis,discusses the different dosage of modified nano ZnO on the silicone acrylic emulsion base expansion type flame retardant coating performance impact.The results show that the coating has the best flame retardancy and smoke suppression performance when 2%modified nano-zno is added.Nano-zno can promote the crosslinking and carbonization reaction of the inflatable flame retardant system in the combustion process,and improve the thermal stability and carbon formation rate of the coating,but the excessive addition of ZnO will destroy the effective structure of the carbon layer,affecting the flame retardant;Using the improved Coats-Redfern integral method,the 3D Jander model(n=2)mainly controls the entire pyrolysis process of the coating.The E of the coating increases from 159.09 kJ/mol to 182.05 kJ/mol at 370-430℃by doping 2%ZnO nanoparticles.