水镁石基复合阻燃剂的制备及在EVA材料中的应用

Preparation and Application of Brucite Matrix Composite Flame-Retardant

采用化学复合方法制备出水镁石基复合阻燃剂,SEM、XRD和EDS测试表明复合阻燃剂颗粒表面粗糙,水镁石表面包覆着许多超细氧化锌粒子,通过BET测定,比表面积由包覆前的10.1499 m2/g提高到13.6762 m2/g。由复合阻燃剂填充的EVA材料,氧指数可达41.8,拉伸强度达13.4 MPa,断裂伸长率达193%,较水镁石原料及水镁石和氧化锌机械混合样的阻燃性能和力学性能有显著提高。TG和DTA热分析表明,复合阻燃剂可提高复合材料的分解温度和燃烧残留率,能有效抑制聚乙烯主链裂解,增强复合材料的热稳定性。

The new brucite matrix composite flame-retardant was prepared with chemical compound technics. SEM, X-ray energy dispersion spectroscopy （X-EDS）, XRD were used and the results show the fine brucite powder is coated with zinc oxide particles in the composite flame-retardant. The specific surface area of particles increases from 10. 1499 m^2/g to 13. 6762 m^2/g by coating. The EVA products filled with the composite retardant have superior flame retardancy （oxygen index 41.8） and mechanical properties（tensile strength 13.4 MPa, elongation at break 193% ） than that with uncoated hrucite and that with the physical mixture of brucite and Zinc Oxide. The thermo analysis （TG, DTA） demonstrates that the composite flame-retardant can increase the decomposition temperature and burning residue rate of the EVA products, and effectively hate thermal cracking of polyethylene＇ s main chain, and promote the development of charting.