Preparation method of nano kaolin for rubber filler

Abstract

The invention discloses a preparation method of nano kaolin for a rubber filler. The method is simple and environment-friendly in process and capable of fully stripping a kaolin lamellar structure, so that the particle size reaches 300-500 nanometers, the lamellar thickness reaches 20-50 nanometers, the nano effect of kaolin can be fully exerted in a rubber system, and the effects of high reinforcement and high filling are achieved.

Description

technical field [0001] The invention belongs to the technical field of kaolin processing technology, in particular to nano kaolin used for rubber filler. Background technique [0002] The interlayers of kaolin are connected by hydroxyl groups on the inner surface, resulting in thicker kaolin particles, difficult peeling and dispersion, and it is not easy to show the nano-size effect of two-dimensional lamellar structure materials, which limits the application effect of kaolin. However, after the particle size of kaolin is processed to the nanometer level, because of its unique lamellar crystal structure, large specific surface area, and small size effect, it can be used in various rubber products, significantly improving its mechanical and physical properties, and can partially replace white carbon black and Carbon black, while reducing its production cost, has advantages especially in terms of elasticity, flex resistance, air tightness and elongation at break. [0003] How...

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Problems solved by technology

[0003] However, domestic research on nano-kaolin technology is less, and most of the methods currently used are mixing methanol and kaolin in a certain ratio to prepare kaolin intercalation precursors, and then performing secondary intercalation with different intercalation agents. The particle size of nano-kaolin processed by the multi-layer process can reach 300-500nm, and the thickness of the sheet layer can reach between 20-50nm, but this method produces volatilization and emission of harmful chemical substances during the production process, which is very unfriendly to the environment. Methanol is flammable and explosive, the production process is complicated, there are great safety hazards, the production continuity is poor, and the production cost is high; there are many domestic studies on the surface modification of calcined kaolin. After high-temperature calcination, the fineness is generally at the micron level and cannot reach the nanometer level. The surface modification process is mostly high-speed friction heat generation modification by high-speed mixers. Modified calcined kaolin is mostly used in insulating rubber and plastics, such as cable insulation. Play the role of increasing the resistance, but the reinforcing effect is not prominent