Studies On Surface Organic Modification Of Tourmaline Powder And Characterization

Tourmaline is widely used in many fields such as environmental protection, functional textile and building materials etc, because of its emitting far infrared rays, releasing anoin and yielding bactericidal, deodorant. However, ultrafine tourmaline powder has large surface energy, so it is easily to reunite mutually. And it is hard to disperse and steady in polymer, owing to the polarity difference of ultrafine tourmaline powder. The comprehensive performance of the tourmaline/polymer composites has been seriously influenced. Surface organic modification of tourmaline powder is an effective way to solve these problems. In this work, through organic modification, the surface of modified tourmaline is hydrophobic, so it improves compatibility and dispersivity with polymer. The conclusions of this dissertation are as follows:The optimum modified conditions that Span60 modified tourmaline powder are obtained. The contact angle and the activation index of modified tourmaline powder reaches to 124.8°and 100%, respectively. Span60 reacts with tourmaline by transesterification, and doesn't change the crystal structure of tourmaline, while surface polarity of modified tourmaline is reduced. Its dispersivity in dry conditions and the number of releasing negative ions are improved. Results of the tourmaline/PP composite's performace show that the dispensability of modified tourmaline in PP is obviously improved, so does the number of releasing negative ions.With titanate coupling agent JN-646 as modifier, the optimum conditions of wet modification of tourmaline are obtained. The settling time of modified tourmaline in liquid paraffin enhances from 14min unmodified tourmaline to 467min. Titanate coupling agent JN-646 reacts with the hydroxy group on the surface of the tourmaline, and it has no effect on the crystal configuration of tourmaline powder. Modified tourmaline's dispersivity in dry conditions and the number of releasing negative ions are improved clearly.The optimum modified conditions of the tourmaline powder with stearic acid are obtained. There is a esterification of the stearic acid and tourmaline powder, so long-chain alkyl is attached to its surface, and no effect on the crystal configuration of tourmaline powder. Surface polarity of modified tourmaline is reduced, and its dispersivity in dry conditions and the number of releasing negative ions are improved. The tourmaline/PP composite materials's performace show that the number of releasing negative ions of modified tourmaline in PP is obviously improved.The optimum modified conditions that PVA modified tourmaline powder are obtained. The modification process doesn't change the crystal configuration of tourmaline, while surface polarity of modified tourmaline is reduced. In dry conditions, modified tourmaline dispersivity and the number of releasing negative ions are improved.The optimum modified conditions of the tourmaline powder with AGE are obtained. AGE reacts with tourmaline powder, but doesn't change the crystal suructure of tourmaline. In dry conditions, the dispersivity and the number of releasing negative ions of modified tourmaline are improved obviously.