Magnesium
hydroxide is a green and environmentally friendly inorganic additive
flame retardant. It has the advantages of good thermal stability,
non-toxicity, easy availability of raw materials, low price, and no
toxic and harmful gases during combustion. It can be widely added to
such as Plastics, rubber, coatings and other polymer materials to
improve their flame retardant properties.
Hebei Messi Biology Co., Ltd. has prepared a highly dispersed hexagonal flake flame-retardant magnesium hydroxide with small particle size and low surface polarity, and at the same time researched its flame-retardant application. The main content includes the following two aspects: First, in order to reduce the agglomeration of magnesium hydroxide particles and improve its compatibility with polymer materials, the hydrothermal method is used to prepare magnesium hydroxide with low surface polarity, good dispersion, and an average particle size of 1 μm. Left and right hexagonal flakes of magnesium hydroxide.
Hebei Messi Biology Co., Ltd. studied the effect of hydrothermal conditions on its crystal growth, especially on the growth of the less polar (001) crystal plane. It is found that reducing the initial particle size of the raw material and the solid content of the feed, increasing the OH- concentration in the hydrothermal medium and the hydrothermal temperature, and prolonging the hydrothermal time are all beneficial to crystal growth, but when the OH- concentration in the medium is greater than 8mol/L or the hydrothermal time When it exceeds 10h, the growth direction of the crystal will be changed, and the growth of (001) crystal plane will be shielded at the same time. The growth process of the crystal is explained by the theory of negative ion coordination polyhedron growth unit.
On the basis of optimizing the experimental conditions, a scale-up experiment was carried out on the preparation of hexagonal flake-shaped magnesium hydroxide, and the…
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