Sol-gel preparation method of aluminum hydroxide

Abstract

The invention discloses a sol-gel preparation method of aluminum hydroxide. The preparation method comprises the following steps: step one, preparing an aluminum chloride solution from aluminum chloride and deionized water, and then dropwise adding hydrochloric acid into the solution to adjust the pH value; step two, adding the prepared solution into a reaction flask provided with a reflux apparatus, a magnet stirrer, and a temperature meter, carrying out reactions in a water bath at a constant temperature, then heating under stirring, and refluxing; step three, after the reactions, cooling to the room temperature, filtering, washing the reaction product by acetone, and then drying the reaction product in a baking oven so as to obtain the aluminum hydroxide powder. In the provided preparation method, the raw materials are dispersed into a solvent to prepare a solution with low viscosity in advance, thus the uniformity in the molecular level can be achieved in a very short time, compared to the reactions performed in a solid, and the chemical reactions can be carried out more easily in a solution, so the synthesis temperature is lower, moreover, the obtained product is finer, and the flame retardant effect is better.

Description

[0001] technical field [0002] The invention relates to a method for preparing aluminum hydroxide, in particular to a method for preparing aluminum hydroxide by a sol-gel method. [0003] Background technique [0004] Flame retardants, also known as flame retardants, fire retardants or fire retardants, are mainly suitable for plastics with flame retardant requirements, delaying or preventing the burning of plastics, especially polymer plastics, so that the ignition time increases, self-extinguishing when ignited, and difficult to ignite . [0005] Aluminum hydroxide (ATH) is one of the earliest inorganic flame retardants, and it is also the most widely used flame retardant in the world. It has the three functions of flame retardant, smoke elimination and filling. It has the advantages of no secondary pollution, synergistic effect with various substances, non-volatile, non-toxic, non-corrosive, and low price. It is an important inorganic Environmentally friendly flame ret...

AI Technical Summary

Problems solved by technology

[0006] At present, the preparation methods of aluminum hydroxide are mainly mechanical pulverization and chemical methods. The aluminum hydroxide powder produced by mechanical pulverization has a relatively coarse particle size and poor flame retardant effect.