This coupling agent is a novel titanate coupling agent independently developed and produced by our company (Opt Chemical Technology Co., Ltd.), which differs from common titanate coupling agents on the market. It is suitable for fillers such as light and heavy calcium carbonate, kaolin, wollastonite, aluminum hydroxide, and pigments like iron red. It is applicable in polyolefin systems (PP, PE, PVC, PS, etc.), natural and synthetic rubber systems, alkyd, and acrylic systems.