| 纳米碳酸钙包覆重质碳酸钙增强聚丙烯复合材料力学性能的研究 |
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| 引用本文：梁津昊,燕溪溪,张素娜,孔令学,吴益华,王利军.纳米碳酸钙包覆重质碳酸钙增强聚丙烯复合材料力学性能的研究[J].上海第二工业大学(中文版),2025,42(1):10-16 |
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| 基金项目:宁波市3315 资本引才计划(2020C-04-T) 资助 |
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| 中文摘要:重质碳酸钙(ground calcium carbonate, GCC) 表面平整且棱角尖锐, 比表面积较小, 作为聚合物的填充材料,通常会影响复合材料的拉伸性能以及抗冲击性。但由于该材料储量丰富、价格低廉且分散性优异, 其在工业中得到了广泛应用。纳米碳酸钙由于具有较大的比表面积, 可以显著提高复合材料的力学性能, 但纳米碳酸钙容易团聚, 且价格高昂, 作为聚合物填料未能得到广泛应用。为此, 通过高压碳化法在GCC 表面原位生成纳米碳酸钙, 制备表面包覆纳米碳酸钙的GCC, 并对包覆前后的颗粒进行结构形貌表征。结果表明: 包覆后的GCC 表面粗糙、边缘钝化、比表面积增大, 一定程度上达到了表面改性的目的。将改性后的GCC 填充到聚丙烯(PP) 中, 并对其力学性能进行测试。相较于纯PP 材料, 其拉伸强度和弯曲强度分别提升了17.10% 和53.92%; 相较于未改性的GCC 填充至PP(PP-GCC) 的拉伸强度、弯曲强度、冲击强度, 分别提升了10.43%、23.75%、28.86%。相较于未改性的重质碳酸钙填充PP 材料的拉伸强度、弯曲强度、冲击强度, 分别提升了10.43% 、23.75%、28.85%。因此, 通过此方法获得的纳米包覆碳酸钙可以改善碳酸钙填充PP 复合材料的力学性能, 具有较好的应用前景。 |
| 中文关键词:纳米碳酸钙 重质碳酸钙 表面包覆修饰 高压碳化法 力学性能 |
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| Study on Mechanical Properties of Nano Calcium Carbonate Coated Ground Calcium Carbonate Reinforced Polypropylene Composites |
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| Abstract:Ground calcium carbonate (GCC), which features smooth surfaces, sharp edges, and low specific surface area, tends to adversely affect the tensile and impact properties of polymer composites when used as a filler. However, due to its abundant reserves, low cost, and superior dispersibility, GCC has been widely utilized in industry. Nano calcium carbonate, with high specific surface area, can significantly enhance the mechanical properties of composites. Nevertheless, the agglomeration tendency and economy imparactically have hindered its extensive utilization in polymer fillers. To address this, a high-pressure carbonization method was used to in-situ generate nano calcium carbonate on the surface of GCC, preparing GCC coated with nano calcium carbonate. The structural and morphological characteristics of the particles before and after coating were analyzed. The results show that the coated GCC exhibits rough surfaces, blunt edges, and increases specific surface area, which achieves the objective of surface modification to some extent. The modified GCC is then filled into polypropylene (PP), and the mechanical properties of the composites are tested. Compared to pure PP, the tensile strength and flexural strength of the modified GCC filled into PP increase by 17.10% and 53.92%, respectively. Furthermore, compared to unmodified GCC filled into PP (PP-GCC), the tensile strength, flexural strength, impact strength of the modified GCC filled into PP improve by 10.43%, 23.75%, 28.86%, respectively. |
| keywords:nano calcium carbonate ground calcium carbonate surface coating modification high-pressure carbonization method mechanical properties |
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