The Preparation Of Aluminium Hydroxide Nanoparticles And Its Technology Optimization

In this dissertation, the preparation of the aluminium hydroxide nanoparticles and its research at home and abroad are reviewed. At the same time, the corresponding elementary theory for the preparation of the aluminium hydroxide nanoparticles has been found by studying and exploring the difficulties in the preparation such as agglomeration problem.In order to find a practical, easily-operating and economical technique to prepare the aluminium hydroxide nanoparticles, many novel methods such as sublimation, heterogeneous azeotropic distillation and so on have been carried out. Meanwhile, the influence of different kinds of reaction mediums was discussed. And during the preparing process, a series of modifications like those of cetyl trimethyl ammonium bromide and silane coupling agent KH-550 were made. The results showed that the best way to prepare aluminium hydroxide nanoparticles is as below: in the organic reaction system—n-butanol system, silane coupling agent KH-550 was used to modify the surfaces of the nanoparticles , which was combined with the heterogeneous azeotropic distillation.As for the best method for the preparation that was determined above, various kinds of operating parameters and factors were examined so as to optimize its technology. After a series of research, the optimaltechnology conditions was found as follows: n-butanol water solution of AlCl3?6H2O(0.5mol-L/1) : ammonia water(6.7mol-L"1)=100 : 27;The amount of silane coupling agent KH-550 is 10% of that of the theoretical product;The precipitator is poured into the reaction system;The reaction temperature is 20~25°C;The reaction time is 25 ~ 30min;The heterogeneous azeotropic distillation solvent is n-butanol and the time for its distillation is 3h;The drying method is under 120°C at normol pressure and the starting drying temperature is also 120°C.