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Plastic material titanate coupling agentcan be used in composite materials to improve thermal stability, surface smoothness and loading level of fillers to reduce the dosage of resin and reduce the cost. It can be applied to polymers including PP, PE and rubber.Titanate coupling agent is a surface treatment agent for inorganic fillers such as calcium carbonate, kaoline etc, to improve hydrophobic property and dispersion of the filler. As a result, the products treated by this product will obtain improved mechanical strength, reduced moisture absorption. .When rubber is filled by the filler of kaolin treated by titanate coupling agent, the rubber can obtain improved tearing strength and tensile strength. So silica can be partly replaced.