Abstract: To improve the compatibility between inorganic bentonite and organic plastic and intensify their compounding effect, the coupling modification of bentonite by aluminate ester was researched.With the settling volume and system viscosity as assessment indexes, the effect of one-time material dosage, modification temperature, modifier dosage and modification time on the bentonite modification were investigated, and the modification mechanism of bentonite by aluminate ester was discussed by infrared spectrum analysis.The results show that aluminate coupling agent has evident modification effect on bentonite and the better modification conditions include temperature of 110 ℃, modifier dosage of 3.0% and modification time of 30 min.Chemisorption and physisorption coexist in the modification process of bentonite by aluminate coupling agent.

Key words: Bentonite, Aluminate coupling agent, Surface modification