【作者】 张平；

【导师】 钟明强；

【作者基本信息】 浙江工业大学 ， 材料工程， 2012， 硕士

【摘要】 现代非开挖管线工程技术是对传统开挖施工的一次技术革命，它可在不破坏道路、植被及不影响环境、交通条件下进行地下管线施工，有效地解决了铁路、河流和在现有建筑物下铺设管道的难题，对电力、通信及建筑给排水等行业的发展与升级改造具有重要的应用价值，其经济和社会意义显著。聚丙烯因其优良的物理机械性能、成型加工性能及生产成本较低等特点，在工业和民用制品领域已得到广泛应用。目前高性能改性聚丙烯电力电缆护套管已被广泛应用于电力、通信、排水等领域的新管道建设和旧管道修复中。本课题以2500目碳酸钙（CaCO3）和2500目高岭土为填充增强剂，采用钛酸酯（NDZ-105）偶联剂对碳酸钙和高岭土进行表面偶联改性，通过双螺杆挤出机制备得到PP/碳酸钙和PP/高岭土两种改性复合材料，并且系统研究了材料的力学性能、流变性能的变化规律，采用扫描电子显微镜(SEM)、差示扫描量热仪(DSC)对改性复合材料的形态结构和结晶行为进行了研究。主要取得以下结果：（1）通过对碳酸钙和高岭土的表面改性改善其表面性能，提高与聚丙烯的结合力，确定了合适的改性剂用量及改性工艺。（2）通过熔融共混法制备了PP/碳酸钙、PP/高岭土复合材料，研究了碳酸钙和高岭土的用量对PP的各项性能的影响规律。结果表明，随着碳酸钙和高岭土含量的增加，复合材料的拉伸强度和拉伸模量先上升后下降，在添加量为30%时达到最高值，缺口冲击强度和断裂伸长率逐渐下降，弯曲强度则随着填充物含量的增加略有提高。（3）熔体流动速率（MFR）分析结果表明，随着碳酸钙和高岭土含量的增加，PP/碳酸钙、PP/高岭土复合材料的MFR逐渐下降，且高岭土对复合材料的影响更大。维卡热变形温度分析发现，碳酸钙和高岭土的加入可提高复合材料的耐热性，但是碳酸钙和高岭土的添加并没有影响复合材料的加工性能。研究得到了具有应用价值的复合材料配方和生产工艺，产品已应用于市政建设工程。更多还原

【Abstract】 Compared with the traditional excavation construction, moderntrenchless technology is a technical revolution. It can be constructed withoutdestroying the road, vegetation, and affecting the environment, trafficconditions. It effectively solves the difficult problem of laying pipes underthe railways, rivers and existing buildings. It has great application value onthe development and upgrading transformation of power, communicationand building drainage industries. There is a remarkable significance ineconomics and society.Polypropylene (PP) is widely used in industry and civilian areasbecause of its good mechanical and processing properties as well as low costof production. Modified polypropylene (MPP) cable pipe is widely used inelectricity, telecommunications, drainage and other fields.In this paper,2500mesh calcium carbonate and2500mesh kaolin wereused as the fillers for reinforcing agents. Titanate（NDZ-105） was used ascoupling agent for the modifications of the calcium carbonate and kaolinsurfaces. PP/calcium carbonate and PP/kaolin composites were preparedthrough the double-screw extrusion mechanism, followed by being injectedinto the spline. The mechanical properties, rheological properties, and thechange law of crystallization properties of the composites materials weresystematically studied via universal testing machine, scanning electronmicroscope (SEM), differential scanning calorimeter (DSC) and other methods.The surface properties of calcium carbonate kaolin were amelioratedfor better cohering to PP matrix and the dosage of modification agent andthe technology were confirmed. With the increase of the content of calciumcarbonate and kaolin, tensile strength and tensile modulus of the compositesincreased to drop, reaching the peak values at30%, the notched impactstrength and elongation decreased gradually, flexural strength increasedslightly. The melt flow rate (MFR) test results show that the MFR of thecomposites descended with the increase of additives, especially obviousfilling with kaolin. Vicat softening temperature (VST) rising indicated thatthe thermal stability was improved. But the processability of the compositeswas not influenced by adding calcium carbonate or kaolin.The valuable composition and the production technology have beenused in industry, and the trenchless pipeline products also been applied incivil construction.更多还原