Studies On Surface Organic Modification Of Tourmaline Powder

As an environment-friendly mineral, tourmaline has been paid much attentionby domestic and international scholars. Because of its function in releasing anion,emitting far infrared rays, antibacterial, mouldproof, insecticidal and deodorization,tourmaline is widely used in many fields such as environmental protection, medicalcare, building materials, functional textile, etc.Tourmaline powder is easy to reunite mutually for its large surface energy andhard to disperse in polymer steadily, which has a major influence in thecomprehensive performance of tourmaline/polymer composites. In order to solvethese problems, tourmaline powder surface needs to be modified organically. Thiswork makes the surface of modified tourmaline hydrophobic to improve compatibilityand dispersivity with polymer. The main methods of surface modification includedry-technology and wet-technology.In this work, the research on the improvement ofmodified tourmaline hydrophobic property have been studied, showing theoreticalsignificance and practical value.This paper researched methods and conditions of the tourmaline in organicsurface modification, and prepared varies of modified tourmalines, discusses theeffect of organic surface modification to the tourmaline performance and structure,and makes the characterization of modified tourmaline by XRD, IR, SEM, DTA andso on. Main conclusions are shown as follows:With the modifying agent of lauroyl chloride, the optimal process condition isobtained through the discussion of modified tourmaline powder. The contact angleand the activation index of modified tourmaline powder are above120°and96%respectively. Lauroyl chloride reacts with tourmaline by transesterification, and hasno effect to the crystal structure of tourmaline. The dispensability of modifiedtourmaline in PE is improved obviously.With Span80as modifier, the optimal conditions are obtained. The contact angle reaches to107.3°, showing the hydrophobic property. The result shows that thereaction has no influence in the crystal structure of tourmaline. The dispensability ofmodified tourmaline is improved obviously.With sodium stearate as modifying agent, the modified tourmaline powder isobtained. This work doesn’t change the crystal structure of tourmaline. Thedispensability of modified tourmaline is obviously improved.Composite materials are made with modified tourmaline powder and PE andcharacterized by the scanning electron microscopy, the results show that the modifiedtourmaline powder shows a very good dispersion in PE.