Furthermore, the silane coupling agent undergoes a hydrolysis reaction in the water phase, and the by-products are low molecular alcohols such as methanol and ethanol, which are flammable and toxic components. For water-based coatings, they are VOCs, and VOCs are strictly controlled by water-based coatings. Index, so water-based coatings modified with silane coupling agents cannot fundamentally solve the problem of low VOC and zero VOC, and will eventually limit their application.