Application of Silica in Modified Materials
When studying nano-silica reinforced and toughened epoxy resin, it is found that nano-SiO can strengthen and toughen epoxy resin within a certain dosage range, and can also improve its heat resistance. E-44/nano-SiO: composite material, under the premise of more uniform dispersion. The optimum dosage ratio of nano-SiO to epoxy resin is 3/100, and the optimum dosage ratio of coupling agent to nano-SiO is 5/100. Wang Ruilan et al. used nano-SiO particles as seeds for in-situ emulsion polymerization of polyacrylates. And use this polyacrylate compound and PVC material blending. It is found that this polymer has better strengthening and toughening effect than the blended material of pure polyacrylate and PVC, and when the content of nano-SiO: 10%, the mechanical properties of the material are the best. The use of nano-scale SiO to fill PVC materials can achieve good results in the modification of materials such as reinforcement and barrier.

The study found that the mechanical properties of TPU/PVC blends have synergistic effects during blending, and the oil resistance and solvent resistance are good. From the perspective of cost and practicality, the blend of TPU and PVC with a mass ratio of 30:70 has the best mechanical properties among the selected fillers. The reinforcing effect of silica is the best. Cao Jiangyong et al. found that silica has a good reinforcing effect on CM/NBR combined glue. The main reason is that the chlorine atom in CM interacts with the silanol group on the surface of silica to form Si-O-C1 chemical bond, which makes Si-O-C1 chemical bond. The crosslink density increases. In the research on silica reinforced PVC wood-plastic materials, it was found that the tensile strength and impact strength of the material were the best when the amount of silica was 10 phr and 15 phr. Increases by 35% and 27%, after adding silica, the elongation at break of the wood-plastic material increases significantly, indicating that silica plays a role in strengthening and toughening. Yang Bo and other studies found that when the amount of CPE is 6 parts. When the amount of SiO was 4 phr, the impact strength of the PVC/CPE/SiO composite system reached the maximum value of 12.2 kJ/m, the tensile strength and flexural strength did not decrease significantly, and the modulus was higher than that of pure PVC, and the toughening contribution rate was And SEM electron microscope pictures show that CPE and white carbon black produce synergistic toughening effect in PVC matrix.