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Introduction to the preparation of aluminum hydroxide fillers and their surface variability
2024/02/23
Alumina filler is a typical polar inorganic material, resulting in its flame retardant composite processing technology and physical and mechanical properties of the decline, ultrafine particle size of ATH, due to enhanced interface interaction, the following talk about its kind of preparation and surface variability.
1. The finer particle size of aluminum hydroxide powder has been increasingly used in different systems of fillers, has a good prospect for development, and the seed decomposition of sodium aluminate solution is the Bayer process to directly produce aluminum hydroxide products, so the combination of the two, with a kind of sub-process to produce qualified particle size and particle size distribution of aluminum hydroxide filler must have good economic benefits.
In various particle size control methods, adding organic additives to control the particle size of the product has the advantages of simple, convenient operation and low cost. The effect of organic additives on the particle size and decomposition rate of the product, and on this basis, further discusses the effect of organic additives on secondary nucleation, agglomeration and crystal growth,
3. Relevant research shows that the addition of additives affects the surface properties of aluminum hydroxide crystals, thus inhibiting the secondary nucleation, making the newly formed secondary nuclei flaky crystals; strengthening the agglomeration of fine particles while hindering the agglomeration of larger particles; in addition, it also has a strong inhibitory effect on the growth of crystals, making the crystals not grow while wearing, this results in the reduction or even absence of large particles.
4. Additives can well control the particle size of seed products, prevent the polarization of its particle size distribution, and obtain seed products closer to the particle size distribution of seed crystals. For the particles in the range of the grain fraction constituting the seed and the bulk of the product volume, the additive has little effect on it, and it is remarkable that the additive system product does not contain large particles above 74 μm, making it possible to produce aluminum hydroxide for fillers with a fairly satisfactory particle size distribution in the case of seed.
Aluminum hydroxide uses a silane or titanate coupling agent with an amphoteric structure to treat aluminum hydroxide to make its surface organic. As long as the method is appropriate, it can improve the affinity between the flame retardant filler ATH and the matrix polymer, and improve the processing performance and mechanical properties of the material.
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