Modification And Application Of Mineral Fibers

Mineral fibers are fabricated by melt and centrifugal method using industrial waste or natural rock as raw materials. Mineral fibers were used to manufacture fiberboards due to their good chemical stability, low thermal conductivity and good heat-resistance. However, the problems of moderate hydrophilicity of mineral fibers and poor compatibility of mineral fibers with organic adhesives should be settled, otherwise they would affect the performance of fiberboards, such as moisture ratio, impact resistance and so on. In order to decrease the moisture ratio of mineral fibers and improve the compatibility of mineral fibers with organic adhesives, the mineral fibers were treated with cationic surfactant-dodecy trimethylammonium chloride and characterized by X-ray fluorescence spectrometry (XRF), infrared spectrophotometry (IR), scanning electron microscope (SEM), X-ray diffractometer (XRD) and so on. Moreover, fiberboards were made from mineral fibers as substrate together with adhesive solvent by wet production process and half-wet production process. Some factors influencing the mechanical properties and moisture ratio of fiberboards such as the types and dosages of adhesives were investigated comprehensively. The results were as follows:(1) Under optimized conditions, the activation index of modified fly ash fibers and rock wool fibers were65%and80%, respectively; and the moisture ratio of modified fibers were3.5%and0.94%, respectively.(2) Compared with the fiberboards made from unmodified mineral fibers, it was showed that the fiberboards made from the modified mineral fibers were of the higher impact strength and lower moisture ratio.(3) The compressive strength of fiberboards prepared by half-wet production process were lower than that of wet production process, thus the impact strength of fiberboards prepared by half-wet production process was higher than that of wet production process.