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The coupling agent is an organosilicon compound with a special structure. In its molecule, there are both reactive groups that can be combined with inorganic materials (such as glass, cement, metals, etc.) and reactive groups that can be combined with organic materials (such as synthetic resins, etc.). Commonly used theories include chemical bond theory, surface wettability theory, deformation layer theory, restraint layer theory and so on. Coupling agents are used as surface modifiers to improve the dispersibility and adhesion of inorganic fillers when filling plastics.