Polypropylene (PP) Nano-Plastic Technology Progress

The emergence of polypropylene (PP) nanocomposites provides an important new way for the enhancement and toughening of PP. Nano-scale fillers are uniformly dispersed into the PP matrix by means of blending, intercalation, etc.; PP nano-composites with excellent comprehensive properties can be obtained, so that the PP material is reinforced and toughened, barrier property, flame retardancy, heat distortion temperature and The aging resistance improves.

Nowadays, research on PP nanocomposites at home and abroad is extremely active. The preparation methods have their own characteristics and many types of fillers are added. According to the types of fillers added, PP nanocomposites can be roughly divided into two categories: one is PP/layered silicate nanocomposites, and the fillers include montmorillonite, attapulgite, sepiolite, mica. Talc, smectite, kaolin, etc. Preparation of such nanocomposites is by intercalation method, composite method, including the unit intercalation polymerization method, polymer solution intercalation polymer melt direct intercalation method and sol-gel method and other four kinds. The direct intercalation method of the polymer melt refers to mixing the polymer with inorganic fillers, and then heating to above the melting point of the PP. The shearing force in the extruder or the mixer causes the two to be mixed uniformly and intercalated and dissociated. Get nanocomposites. This method has the advantages of simple operation, processing by conventional methods, ease of industrialization, absence of additives such as solvents, absence of environmental pollution, and the like. Therefore, there are many researches at present, and there is a great future for development; the other is PP/inorganic rigid particle nanocomposites, in which the fillers include CaCO3, SiO2, Al2O3, SiC, and Si3N4. At present, the preparation of PP/inorganic rigid particle nanocomposites is basically a melt blending method. In a twin screw extruder, nanometer-sized inorganic rigid particles are dispersed in a PP matrix by a shear force to obtain a PP nanocomposite. material.

From the perspective of research, PP/layered silicate nanocomposites have much more research than PP/inorganic rigid particle nanocomposites, and their breadth and depth are unmatched by the latter, both theoretically and practically. The research results on the above are all 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 a successful PP/EPR/talc nanocomposite. The nanocomposite material overcomes the drawbacks of the conventional PP modified material having increased toughness and reduced elongation at break, and has high flowability, high rigidity, and impact resistance, and is used for manufacturing front and rear bumpers of automobiles, and in 1991. In the year of commercial production, the material was called "Toyota Super Olefin Polymer." The performance comparison of PP/EPR/talc nanocomposite and elastomer modified PP is shown in the following table:

Facing the trend of global automotive design and manufacturing in the future, Toyota Motor Corp. plans to make this PP nanocomposite a standard material for automotive use. The company also plans to research and develop seven types of exterior decorative resin materials and 13 kinds of interior decorative resin materials used in automobiles into nanocomposites.

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