Preparation and sound absorption properties of nylon 66 fiber-Q235 steel composite plate based on electrostatic flocking technology

The nylon 66 fiber-Q235 steel composite plate was made by electrostatic flocking technology, and the effect of different amount of adhesive coating on flocking fastness was studied. The morphology of villi layer was observed and analyzed by SEM, and the sound absorption properties of composite plate were measured by transfer function method in the frequency range of 200-6 300 Hz. The influences of flocking voltage, flocking time, plate spacing and fiber morphology structure on the sound absorption properties were analyzed. The results show that, flocking fastness increases with the increasing amount of adhesive coating, on the premise of no air bubbles, 100 g/m² is the best coating amount. As flocking voltage increasing, sound absorption properties improve, change rate decreases and finally tends to be stable. As plate spacing increasing, sound absorption properties decreases, begins to decline slowly, then gradually speeds up. The best flocking parameters are flocking voltage of 90 kV, flocking time of 40 s, plate spacing of 10 cm. Fiber morphology structure also has obviously influence on the sound absorption properties of nylon 66 fiber-Q235 steel composite plate. Reduce the fiber length and fiber diameter both can improve the sound absorption coefficient of composite plate, the best fiber morphology structure parameters are length of 0.9 mm, diameter of 20 μm.