Application of ultrafine silica in plastics

Using the high strength, high fluidity and small size effect of ultrafine silica, the density, smoothness and smoothness of plastic products can be improved. Wear resistance. Through appropriate surface modification, the purpose of strengthening and toughening plastics can be achieved at the same time.

Adding silica black to polyethylene, through a special method, ultra-fine silica can be evenly dispersed in the matrix to produce highly wear-resistant, High hardness polyethylene composite material. The surface of silica was modified by graft polymerization, and the polymer macromolecular chains were used to effectively block the nanoparticles and reduce their agglomeration, and then filled polypropylene with them, and a blending process was used to prepare nanoparticles with excellent comprehensive properties. Si02/PP composite material. At low addition amounts, the toughness of polypropylene can be increased by about two times.

If an appropriate amount of elastomer is added to the composite system, the notched impact resistance of polypropylene will be improved by 3 while maintaining the rigidity and tensile strength of the polypropylene. About times, analysis suggests that silica and elastomers can work synergistically to achieve the purpose of strengthening and toughening polypropylene.

Using a blending method to add ultrafine silica to PMMA to prepare nano-SiO2/PMMA plastics, which can greatly improve the material’s properties. performance. 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 silica modified with styrene or methylchlorosilane to the Ps and PP blend system can reduce the interfacial tension between the phases, lower the cloud point temperature, and improve the compatibility between the two.

Adding ultrafine silica to epoxy resin can significantly improve its brittleness and overcome the rigidity and stiffness of the material caused by the toughening of elastomers. The defect of reduced strength is achieved to 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 nanosilica is modified by a 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 the product can also be improved.