The appearance of polypropylene (PP) nanocomposites provides an important new way to achieve the enhanced toughening modification of PP. The nano-sized filler is uniformly dispersed into the PP matrix by means of blending, intercalation, etc.; the PP nanocomposite with excellent comprehensive properties can be obtained, and the PP material is strengthened and toughened, barrier property, flame retardancy, heat distortion temperature and Improved aging resistance.
At present, the research on PP nanocomposites at home and abroad is extremely active, and the preparation methods have their own characteristics. There are many kinds of fillers added. PP nanocomposites can be roughly divided into two categories according to the type of fillers added: one is PP/layered silicate nanocomposites, and the fillers include montmorillonite, meteorite, sepiolite, mica. , talc, smectite, kaolin, etc. The preparation of such nanocomposites is carried out by intercalation method, composite method, including unit intercalation polymerization method, polymer solution intercalation polymer melt direct intercalation method and sol-gel method. The direct intercalation method of the polymer melt refers to mixing the polymer and the inorganic filler, and then heating to a temperature above the melting point of PP, and uniformly mixing the two by shearing force in an extruder or a kneader, and dissociating the intercalation layer. A nanocomposite is obtained. Since the method has simple operation, it can be processed by a conventional method, is easy to be industrialized, has no additives such as a solvent, and has no environmental pollution. Therefore, there are many studies at present and there is a great development prospect; the other is PP/inorganic rigid particle nanocomposites, among which the fillers include CaCO3, SiO2, Al2O3, SiC, Si3N4 and so on. At present, the preparation of PP/inorganic rigid particle nanocomposites is basically a method of melt blending. In the twin-screw extruder, the nano-scale inorganic rigid particles are dispersed into the PP matrix by means of shearing force to obtain PP nanocomposites. material.
From the research situation, PP/layered silicate nanocomposites are much more studied than PP/inorganic rigid particle nanocomposites, and their breadth and depth are unmatched by the latter. Theoretical and practical applications The research results on the above are quite significant and are a key method for the development of PP nanocomposites.
In 1991, Toyota Motor Corporation of Japan and Mitsubishi Chemical Corporation jointly developed PP/EPR/talc nanocomposites. The nano composite material overcomes the disadvantages of increasing the toughness of the PP modified material and the elongation at break, and has high fluidity, high rigidity and impact resistance, and is used for manufacturing front and rear bumpers of automobiles, and in 1991. Commercialized in the year, the material is called "Toyota Super Olefin Polymer". The performance of PP/EPR/talc nanocomposites and elastomer modified PP is as follows:
Facing the future development of automobile design and manufacturing to globalization, Toyota Motor Corporation plans to make this PP nanocomposite a standard material for uniform use in automobiles. The company also plans to research and develop seven kinds of exterior decorative resin materials and 13 kinds of interior decorative resin materials used in automobiles to form nanocomposites.
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