水泥行业用覆膜滤料的制备及其性能研究

水泥行业排放要求越发严苛,对覆膜滤料的要求越来越高。该文针对覆膜滤料阻力高、精度低、使用寿命短等问题,采用聚四氟乙烯(PTFE)和聚全氟乙丙烯乙烯(FEP)为原料,通过双向拉伸法制备PTFE/FEP复合膜,提高膜透气和力学性能,控制孔径,经过和玻纤布覆合后,形成覆膜滤料,提高了覆膜滤料的透气和使用寿命。对比了PTFE/FEP复合膜和同工艺下PTFE微孔膜的透气率、厚度、力学和微孔性能的变化,对覆膜后滤料的基本性能也进行了对比分析,研究表明,PTFE/FEP复合膜的透气率和力学性能优于同工艺下PTFE微孔膜,且经过热压覆合后滤料的透气率、耐磨性优于同工艺下PTFE微孔膜覆膜滤料,可有效降低阻力、保证精度、提升寿命。

智能卡制备中PETG预涂膜的性能研究

以六亚甲基二异氰酸酯(HDI)、聚碳酸酯二醇(PCDL)、聚四氢呋喃二醇(PTMG)、甲基丙烯酸β羟乙酯(HEMA)、二羟甲基丙酸(DMPA,2,2二羟甲基丙酸)等为基本原料,制备出聚对苯二甲酸乙二醇酯1,4环己烷二甲醇酯(PETG)预涂膜用涂层。利用红外光谱仪和扫描电子显微镜等测试设备对预涂膜进行表征,并研究了涂层中不同原料对PETG预涂膜热覆合性能的影响。结果表明,使用水合肼后扩链,增加聚醚二醇和丙烯酸酯的量,PETG预涂膜活化温度更低,剥离强度最优。

Preparation and properties of nano-composite ceramic coating by thermo chemical reaction method

Nano-composite ceramic coating was fabricated on Q235 steel through thermo chemical reaction method. Structure of the coating was analyzed and the properties were tested. The results show that a few of new ceramic phases, such as MgAI2O4, ZnAI2O4, AI2SiO5, Ni3Fe and Fe3AI, are formed on the coating during the process of solidifying at 600 ℃. The ceramic coating is dense and the high bonding strength is obtained. The average bonding strength between the coating and matrix could be 14.22 MPa. The acid resistance of the coating increase by 8.8 times, the alkali resistance by 4.1 times, the salt resistance bv 10.3 times, and the wear resistance bv 2.39 times.