Study On Ultrfine Gangue Mineral Power Used As Natrral Rubber Reinforcing Filling

Coal gangue is a rock exist inside coal-layer and the circumference of coal-layer, is an industrial solid waste produced during the processing of coal mining and mineral processing, the mineral components of which is kaoline and organic component part. The coal gangue not only take up the land of large quantity, but pollute the soil, plants, water and air resulted in endanger the health of human body. Using coal gangue as raw material, we made a kind of new type polymer reinforcing filler for rubber by ultra-fine grinding and surface treatment. Coal gangue partial replacement of carbon black, which not only make use of waste material but also reduce the price of rubber product, and which have economic and social benefits.The coal gangue come from main coal-layer in QinShui coalfield of china, The main composition and the property parameters of coal gangue are SiO2,34.16% ; Ai2O3,29.48%; Fe2O3,0.78%; ignition lose,35.02%; oil factor DBF, 0.45 -0.50ml/g; DTA indicate that the mineral ingredients of coal gangue are kaolin and organic component.We can take three gangue products after grinding by Ultrasonic jet mill, the results of particle size indicate the most of particle is below 1 u m ,the result of infared analysis demonstrated ,after grinding, the activity of surface groups of coal gangue become stronger.The coal gangue were modified with titanate alkoxide coupling agent NDZ-13(K NDZ-201 and silane coupling agent KH-550 in this paper. The modification effects were assessed with activation index and infrared absorption spectroscopy, the result showed the surface of coal gangue is covered with a layer organic molecular, the surface has changed from hydrophilic to hydrophobic .The coal gangue was filled into rubber after ultra-fine grinding and modification. The measurement of properties of vulcanized rubber showed the properties correlated to the particle size, structure and surface properties of rubber filler. As particle size becomes smaller, and the surface area increases, providing more available contact between the rubber matrix and the filler particle and the properties of vulcanized rubber are better. The lots of organic groups and defects of coal gangue surface lead to difference between coal gangue and comment inorganic fillers and different coupling agent have different influence on the properties of rubber, the choose of coupling agent is the key of surface treatment.The quantity of coal gangue has more effect on the properties of rubber. When the quantity of rubber is 300g,the quantity of the coarse coal gangue is 75g,the ultra-fine coal gangue is 75-105g ,the modified coal gangue is 105g ,the properties of vulcanized rubber is the best.In addition, the paper discussed the difference between the calcinated coal gangue and coal gangue, which indicated the modified mechanism and the action mechanism with rubber between the calcinated coal gangue and coal gangue is different, the coal gangue depend on-OH, and the calcinated coal gangue depend on Si-O and Al-O.