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By taking advantage of the high strength, high fluidity and small size effect of silica, the high density, smoothness and wear resistance of plastic products can be enhanced. If appropriate surface modification is carried out, the purpose of reinforcing and toughening plastics can be achieved simultaneously.
By adding silica to high-pressure polyethylene in a unique way, silicon dioxide can be evenly dispersed in the matrix, resulting in polyethylene composites with high wear resistance and hardness. The surface of silica was modified by grafting and convergence. The macromolecular chains of polymers were used to effectively isolate gold nanoparticles and alleviate their agglomeration levels. Thus, they were used to fill polypropylene, and a nano-sio2 / PP polymer material with excellent comprehensive performance was produced by the blending process. When the addition amount is low, the ductility of polypropylene can be increased by about twice.
If an appropriate amount of polyurethane elastomer is added to the composite management system, it can maintain the stiffness and tensile strength of polypropylene while increasing its resistance to void impact by about three times. It is analyzed that the silica manufacturer and the polyurethane elastomer can have a synergistic effect to achieve the goal of toughening polypropylene.
The nano-technology sio2 / PMMA plastic prepared by adding silica to PMMA through blending can significantly improve the performance of raw materials. When the addition amount is 4%, the void impact compressive strength of PMMA can be increased by more than 80%, and the produced polymer material has excellent optical light transmittance. In the blend management system of plastics and other polymers. Silica can be added to improve the compatibility of the two phases. If silica modified by butadiene or hydroxychlorosilane is added to the Ps and PP blend management system, it can reduce the surface tension of the two colors, lower the cloud point temperature, and improve the compatibility of the two.
Adding silica to epoxy resin adhesive can significantly enhance its ductility, overcome the drawback of reduced stiffness and compressive strength of raw materials caused by the toughening of polyurethane elastomers, and achieve the goal of improving toughening. When the addition amount is 3wt %, the impact compressive strength of the composite management system can be increased by 40%, and the tensile strength, etc. can be increased by 21%. If the nano-technology silica is modified by silane coupling agent, its fracture toughness can be increased by 124%, tensile performance can be improved by 30%, and in addition, the strength, wear resistance, high-temperature resistance and insulation layer properties of the product can also be enhanced.
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