The application in plastics utilizes the high strength, high fluidity and small size effect of silica, which can improve the compactness, smoothness and wear resistance of plastic products. Through appropriate surface modification, the purpose of strengthening and toughening plastics can be achieved at the same time.

By adding fumed silica into polyethylene, through a special method, the silica can be uniformly dispersed in the matrix, and a polyethylene composite material with high wear resistance and high hardness can be obtained. The surface of fumed silica is modified by grafting polymerization, and the polymer macromolecular chain is used to effectively block nanoparticles and reduce the degree of agglomeration. Then, polypropylene is filled with it. Gas phase nano SiO2/PP composites. At low addition levels, the toughness of polypropylene can be increased by about two times. If an appropriate amount of elastomer is added to the composite system, while maintaining the rigidity and tensile strength of polypropylene, the notched impact resistance of polypropylene is increased by about 3 times. The purpose of strengthening and toughening polypropylene. The nano-SiO2/PMMA plastic prepared by adding silica into PMMA by blending method can greatly improve the properties of the material. When the addition amount is 4%, the notched impact strength of PMMA can be increased by more than 80%, and the prepared composite material has good optical transparency.

In plastic and other polymer blend systems. Silica can be added to improve the compatibility of the two phases. For example, adding fumed silica modified with or methyl chloride into the blend system of Ps and PP can reduce the interphase interfacial tension, lower the cloud point temperature, and improve the compatibility of the two.

Adding fumed silica to epoxy resin can significantly improve its brittleness, overcome the defects of material rigidity and strength reduction caused by elastomer toughening, and achieve the purpose of strengthening and toughening. When the addition amount is 3wt%, the impact strength of the composite system can be increased by 40%, and the tensile strength can be increased by 21%. If nano-silica is modified by coupling agent, its impact toughness can be increased by 124%, and its tensile properties can be increased by 30%. In addition, the hardness, wear resistance, temperature resistance and insulation properties of products can also be improved.

The application of thixotropic polyester and gel coat resin In the thixotropic polyester resin, almost all of them are silica. On the one hand, it can make the thickness of the product more uniform and less shrinkage, which is more in line with the design requirements; On the one hand, due to the thixotropy of the resin, the flow and dripping of the resin is reduced, and the waste of the resin is reduced. The production environment is protected. In the phthalic acid-type unsaturated polyester with a content of 43.5%, adding 2% silica can achieve a thixotropic index of 4.8, which has met the construction technology of domestic gel coat resins .

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