Vinyl silane coupling agents can improve the interface properties of two completely different substances when dealing with glass fibers and granular fillers in inorganic/resin-based composite materials, and greatly improve the strength of the composite materials. The vinyl or ethylene group in this type of coupling agent has the reactivity of polymerization or copolymerization, which can easily crosslink the polymer, thereby improving the mechanical properties, electrical properties and surface properties of the modified polymer. It is commonly used in polyethylene. Modification of thermoplastics or rubbers.