羟基硅油对Mg(OH)_2高填充HDPE力学性能的影响

Effects of Hydroxyl Silicone Oil on the Mechanical Properties of HDPE Highly Filled with Mg(OH)_2

研究了超细Mg(OH) 2 填料用量、填料表面改性、羟基硅油用量等因素对于高填充高密度聚乙烯 (HDPE)力学性能的影响。当超细Mg(OH) 2 填料用量达到 70份时 ,HDPE复合材料表现出明显的脆性拉伸断裂行为。用硅烷偶联剂和钛酸酯对超细Mg(OH) 2 填料进行表面改性 ,能提高高填充HDPE的拉伸强度 ,而对于断裂伸长率的影响较小。羟基硅油能有效改善高填充HDPE的韧性。在 1 40份的高填充量下 ,用羟基硅油处理钛酸酯改性超细Mg(OH) 2 ,HDPE的断裂伸长率和冲击强度提高 ,而拉伸强度略有下降。当羟基硅油用量为 1 0份时 ,经处理的改性Mg(OH) 2 高填充的HDPE的断裂伸长率和冲击强度分别从不经处理的 1 .9%和 2 .5 9kJ/m2 提高到2 80 .8%和 37.30kJ/m2 。

The effects of dosage and surface modification of superfine Mg(OH) 2 and dosage of hydroxyl silicone oil on the mechanical properties of HDPE highly filled with Mg(OH) 2 are investigated. The HDPE composite materials show the behaviors of brittle tensile break when the dosage of filler is over 70 phr. After modifying the surface of superfine Mg(OH) 2 with such coupling agent as silane and titanate ,the tensile strength can be promoted,but the effect on the elongation at break is not significant . The toughness of a highly filled HDPE can be effectively promoted by hydroxyl silicone oil. When the titanate modified superfine Mg(OH) 2 is treated with the hydroxyl silicone oil,the elongation at break and the impact strength of the HDPE are increasedat,but the tensile strength is slightly decreased at 140 phr of filler loadings.When 10 phr of hydroxyl silicone oil are added,the elongation at break and the impact strength of the HDPE filled with treated Mg(OH) 2 increase to 280.8 % and 37.30 kJ/m 2 from 1.9 % and 2.59 kJ/m 2 as no treatment for the fillers respectively.