Study On Intercalation And Exfoliation Of Kaolinite And Its Application In The Rubber Composite

The kaolin from Zhangjiakou in Hebei provinice was analysed by the theoretical knowledge of mineralogy, material sciences and geological background. The properties and orgin of this kaolin sample were discussed. Five chemicals were intercalated into the interlayer of kaolinite by immersion method. The d (001) spacing of kaolinite was expanded to 1.42 nm by potassium acetate, which is larger than intercalated by the other four chemicals. Based upon the interclation results, the factors that influence the intercalation were investigated, and the thermal behavior of kaolinite/potassium acetate intercalation complex were discussed. The molecular structure of kaolinite/potassium intercalation complex was simulated with the software Materials Studio and calculated by the length of band. The intercalation caused the destruction of the hydrogen bonding between the kaolinite layers. Therefore, delamination of kaolinite was achieved through intercalation and ball-milling. This method did not change the structural order, and the kaolinite particulates have high aspect ratio and good particle size. The influence fators of the delamination of intercalated kaolinite were discussed. The kaolinite intercalated with potassium acetate and delamination is applied to reinforced the rubber composites. In order to improve the gas permeability and mechanical property of rubber composites, the intercalation and delamination experiments of kaolinite filled the rubber are researched.The reinforcing and barrier mechanism of delaminated and intercalated kaolinite in rubber composites were analysed elaborately based on the combination of experimental results.