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将少量Zn(MAA)2和Mg(MAA)2分别添加到EPDM/NBR橡胶中制成柔性绝热层材料,分别研究了其各自用量对绝热层材料交联密度、拉伸强度、断裂伸长率、硬度、密度和烧蚀速率等的影响。结果显示:随着Zn(MAA)2或Mg(MAA)2用量增加,绝热层材料的交联密度、拉伸强度、密度等均呈现增大趋势,而材料的硬度基本不变;沿纤维方向上绝热层的断裂伸长率先增加后降低,均在用量为3phr时出现最大值,而垂直于纤维方向上Zn(MAA)2增强的绝热层其断裂伸长率急剧下降,Mg(MAA)2增强的绝热层则缓慢下降;与Zn(MAA)2增强体系相比,Mg(MAA)2增强体系的交联密度、断裂伸长率均明显高于前者,材料密度、线烧蚀速率和质量烧蚀速率则低于前者,是柔性绝热层材料获得高伸长率、低烧蚀速率的理想添加剂;综合考虑绝热层材料的各项性能,Mg(MAA)的最佳用量以2～4phr为宜。
A small amount of Zn (MAA) 2 and Mg (MAA) 2 were added to the EPDM / NBR rubber to make the flexible insulation material. The effects of their respective dosage on the crosslinking density, tensile strength, elongation at break , Hardness, density and ablation rate and so on. The results show that with the increase of the amount of Zn (MAA) 2 or Mg (MAA) 2, the cross-linking density, tensile strength and density of the insulation materials all show an increasing trend, while the hardness of the material does not change basically; The elongation at break of the upper insulation increases first and then decreases, and the maximum value appears at the dosage of 3 phr. The elongation at break of the insulation strengthened with Zn (MAA) 2 perpendicular to the fiber decreases sharply. The elongation at break of Mg (MAA) 2 Compared with Zn (MAA) 2 reinforced system, the crosslinked density and elongation at break of Mg (MAA) 2 reinforced system were significantly higher than the former, and the density of materials, the rate of line ablation and the mass Ablation rate is lower than the former, which is an ideal additive for obtaining high elongation and low ablation rate of flexible insulation materials. Considering all the properties of the insulation material, the optimum dosage of Mg (MAA) is 2 to 4 phr .