水溶性锆杂化硅树脂浸润剂提高玄武岩纤维的耐热性能

现有玄武岩纤维制成的高温烟气滤袋工作温度为280℃,难以在300℃甚至更高的温度下长期工作。为了提高玄武岩纤维的耐热性能,本文合成了一种水溶性锆杂化硅树脂浸润剂,并用于玄武岩纤维表面改性。用FTIR、TG-DSC、SEM、AFM、DCA及拉伸实验对锆杂化硅树脂及改性纤维进行了微观结构和性能表征。结果表明：锆杂化硅树脂的初始热分解温度为323～360℃;浸润后的玄武岩纤维表面包裹着一层致密、均匀的硅树脂膜,这层膜增大了纤维表面的粗糙度和表面积,提高了纤维的表面能,改变了纤维的表面结构,修复了纤维的表面微缺陷;力学测试表明：浸润后的纤维在300℃热处理2 h后,最优断裂强力值为376.0 N,断裂伸长率为2.647%,优于未被浸润纤维(287.8 N、1.932%)的相关性能。因此,锆杂化硅树脂浸润剂可显著提高玄武岩纤维的耐热性能。

Water-soluble zirconium hybrid silicone resin sizing for improvement heat resistance of basalt fibre

The working temperature of the existing high-temperature basalt fibre filter bag is 280℃, they are difficult to work for a long time when the temperature is above 300℃. In order to improve the heat resistance of basalt fibres, in this paper, a kind of water-soluble zirconium hybrid silicone resin sizing agent was synthesized and used for basalt fibre surface modification. Microstructure and properties of zirconium hybrid silicone resin and modified fibers were characterized by FTIR, TG-DSC, SEM, AFM, DCA and tensile test. The results show the decompose temperature of zirconium hybrid silicone resin is 323-360℃. The surfaces of the sized fibres are coated by dense and uniform silicone resin films. These films increase the surface roughness and surface areas of the fibre surfaces, improve the surface energies, change the surface morphologies, repair the surface micro defects. Themechanical tests show that after heat treatment of 2 h at 300℃, the breaking force of optimum sample is 376.0 N, and the breaking elongation is 2.647%, which are better than the related performance of uncoated fibre (287.8 N, 1.932%). Therefore, the zirconium hybrid silicone sizing agent could significantly improve the heat resistance of basalt fibre.