The Research On Conductivity Performance Of Leather Flock And Its Application

China has a large leather industry. Leather products are popular among consumers for its unique style and hand-feeling, and the advantages such as heat retention and comfortability. As the consumption level improved constantly, the leather consumption increases year by year. In the process of leather making, a lot of leftover material and scrap leather will be generated. If the leather waste was dumped or burned without any treatment, it will not only waste the resources, but also can bring environmental pollution. So the research on the utilization of leather waste is a big issue. The main constituents of leather are collagen fibers, and leather flock can be obtained from waste leather after mechanical crushing. Using electrostatic flocking technology, the leather flock will be flocking to the artificial leather base fabric, and the plant suede has a closer hand-feeling and style to the leather, a new type of artificial leather products can be produced, so it has great application values and economic benefits.The structure and properties of leather clock were preliminary analyzed, the surface morphology was observed, the FT-IR and XRD were analyzed, charging and soaring of flock in the electrostatic field were also discussed. The surface of leather flock is wrapped by fibrillation fine fiber, and the leather flocks are easily collected together, and the dispersion of the clock is poor. The FT-IR analysis result shows that the leather flock has the same characteristic peak with natural protein fiber. The crystallinity of Leather flock is 27.56%, and the moisture regain is 7.8%, higher than general chemical fiber moisture regain, and should be easier to charge in the electrostatic field.The flock has a poor flocking performance in the electrostatic field without scouring treatment, and cannot meet the requirement of flocking. The scouring treatment was studied in the paper. By the respective changes and orthogonal optimization of the scouring agent, the final scouring agent has been found: silicon dioxide liquid is 4%, aluminum collosol is 3%, sodium chloride is 7% and aluminum potassium sulfate is 4%. Sodium chloride and aluminum potassium sulfate were used as inorganic electrolytes to enhance the flying ability of the flock in the electrostatic filed. Silicon dioxide liquid was used as dispersing agent and aluminum collosol was used as antistatic agent. Aluminum collosol has the largest impact on the effect of flocking, and aluminum potassium sulfate has the least influence. The bath ratio, temperature and time of the scouring treatment were studied, and the optimum technological conditions were obtained, bath ratio is 1:60, temperature is 40℃, and the processing time is 20 min. After the optimal scouring treatment, the flying ability, electrical conductivity and dispersion of the treated flock were improved significantly compared with which of untreated flock, and can satisfy the requirements of flocking.The influence of electrode plate voltage and distance, flocking time, coating dosage of adhesive on flock density and fastness in the process of electrostatic flocking was mainly discussed and the flocking process conditions were optimized. Field intensity between plates can be increased by increasing plate voltage and decreasing plate distance. The experimental results show that the flock density and the fastness enhanced with the decrease of electrode distance and the increase of electrode voltage, fastness enhanced more obviously. With the increase of flocking time, the flock density increased at first and then went to a constant value. The film thickness of adhesive depends on the coating dosage and has a large influence on the depth of flocks in the film and flock fastness. With the increase of coating dosage of adhesive, both the flock density and the fastness enhanced gradually before they reached constant values. The sample after flocking should been preliminary dried and baked, for the water in adhesive can evaporate in the preliminary drying process and the cross-linking reaction could react in the baking process to make flocks fixed on substrate. The optimum technological conditions: electrode voltage is 70 kV, electrode plate distance is 6cm ~8cm, flocking time should more than 9s and the coating dosage of adhesive is 300g/m2~350g/m2. Flocking samples are dried at 80℃for 10 min, baked at 140℃ for 15 min.