国内外玻璃纤维用高岭土的质量差距及提高我国高岭土质量的对策

Differences of Kaolin Quality for Glass Fibers Made in China and Abroad and Improving Measures of Kaolin Quality Made in China

高岭土是E-玻璃纤维的重要原料之一,其用量可占配合料的三分之一,但国内玻纤用高岭土高端市场一直被进口产品所占据。选取了美国ITC进口高岭土、宜昌硬质高岭土和云南水洗高岭土这三种有代表性的玻纤用高岭土,通过荧光光谱分析、X射线衍射分析、扫描电镜分析和激光粒度分析详细对比了它们在化学成分、物相组成、微观形貌和粒度分布四方面的差异。研究发现,美国玻纤用高岭土在产品纯度、粒度控制和质量稳定性方面有明显优势;国内玻纤用高岭土矿源品质并不差,只是由于缺乏专门的质量标准,同时受限于国内非金属矿产加工水平,而无法生产出高质量的产品。未来我国高岭土行业应尽快通过整合做大做强,努力提高高岭土选矿、均化等加工工艺水平,填补国内高档玻纤用高岭土产品空白。

Kaolins are one of important materials for E-glass fibers,which accounts for about 1/3 of blend mass.But the high-end market of kaolin for glass fibers was dominated by imports in China.Three kinds of kaolin samplesproduced by ITC,Yichang and Yunnan for glass fibers were studied in this paper.The differences in chemical composition,phase,microstructure and granulometric composition were compared in detail by XRS,XRD,SEM and LPS.The research found that products of ITC had obvious advantages in product purity,particle size control and quality stability.In fact,the quality of domestic Kaolins is not bad,but because it is lack of specific quality standard and limited by the processing level of domestic non-metallic mineral,high-quality products cannot be obtained.In the future,kaolin industry should become bigger and stronger by integration as soon as possible,and try hard to improve the processing level of kaolin such as ore dressing,homogenization,etc,to fill the gap in the high-grade kaolin products for glass fibers.