CaCO_(3)形貌对LLDPE/HDPE/CaCO_(3)复合材料性能的影响  

Effect of CaCO_(3) Morphology on Properties of LLDPE/HDPE/CaCO_(3) Composites

作　　者：孙岭 罗文倩 何丽秋 王吉林[1,2] 莫淑一 李世令[3] 龙飞 SUN Ling;LUO Wen-qian;HE Li-qiu;WANG Ji-lin;MO Shu-yi;LI Shi-ling;LONG Fei(College of Materials Science and Engineering,Guilin University of Technology,Guangxi Research Center of Inorganic Nano Powder and Application Engineering,Guilin 541004,China;Guangxi Key Laboratory of Optical and Electronic Materials and Devices,Guilin 541004,China;Guilin Jinshan New Material Co.,Ltd.,Guilin 541299,China)

机构地区：[1]桂林理工大学材料科学与工程学院广西无机纳米粉体及应用工程研究中心,广西桂林541004 [2]广西光电材料与器件重点实验室,广西桂林541004 [3]桂林金山新材料有限公司,广西桂林541299

出　　处：《塑料科技》2023年第4期1-5,共5页Plastics Science and Technology

基　　金：广西重大科技专项(桂科AA18242041)。

摘　　要：以不同形貌碳酸钙(CaCO_(3))为填料,以低密度线型聚乙烯(LLDPE)和高密度聚乙烯(HDPE)为基体,采用双螺杆辅助二次混合注塑工艺制备LLDPE/HDPE/CaCO_(3)复合材料。对不同形貌CaCO_(3)填料的吸油值、白度、活化度等进行表征,对LLDPE/HDPE/CaCO_(3)复合材料的断面形貌和热力学性能进行分析。结果表明:多次混合使CaCO_(3)在LLDPE/HDPE/CaCO_(3)复合材料中分散更均匀,复合材料力学性能更稳定。添加CaCO_(3)的复合材料热稳定性明显增强。CaCO_(3)形貌对LLDPE/HDPE/CaCO_(3)复合材料的力学性能影响显著。超细活性重钙加入后,LLDPE/HDPE/CaCO_(3)复合材料的拉伸强度、冲击强度分别是纯相LLDPE/HDPE复合材料的1.33倍和4.15倍。棒状活性轻钙加入后,LLDPE/HDPE/CaCO_(3)复合材料的冲击强度、弯曲强度是纯相LLDPE/HDPE复合材料的3.1倍和2倍。LLDPE/HDPE/CaCO_(3) composites were prepared by twin-screw assisted secondary mixing injection molding process with different morphologies of calcium carbonate(CaCO_(3))as filler,low density linear polyethylene(LLDPE)and high density polyethylene(HDPE)as matrix.The oil absorption value,whiteness and activation degree of CaCO_(3) fillers with different morphologies were characterized.The fracture morphology and thermodynamic properties of LLDPE/HDPE/CaCO_(3) composites were analyzed.The results show that multiple mixing makes CaCO_(3) disperse more uniformly in LLDPE/HDPE/CaCO_(3) composites,and the mechanical properties of composites are more stable.The thermal stability of the composites with CaCO_(3) is significantly enhanced.The morphology of CaCO_(3) has a significant effect on the mechanical properties of LLDPE/HDPE/CaCO_(3) composites.The tensile strength and impact strength of LLDPE/HDPE/CaCO_(3) composite are 1.33 times and 4.15 times that of pure LLDPE/HDPE composite,respectively with the addition of ultrafine active heavy calcium.The impact strength and flexural strength of LLDPE/HDPE/CaCO_(3) composite are 3.1 times and 2 times that of pure LLDPE/HDPE composite with the addition of rod-like active light calcium.

关 键 词：碳酸钙 聚乙烯 热稳定性 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ325.12[化学工程—合成树脂塑料工业]