The Magnesium hydroxide has many advantages, such as flame retardant, smoke suppression, environmental protection and low price. At the same time, the strong polarity of the Magnesium hydroxide surface, which makes it difficult to disperse evenly in the polymer, and the low flame retardancy and high resin-filling result in serious deterioration of the mechanical properties of the composite.
The hard segment of thermoplastic polyethylene elastomer (Pee) is PE resin, and the soft segment is the synthetic rubber of polyolefin such as EPR and EPDM. The purpose of surface modification of Magnesium hydroxide powder is to optimize the dispersion of Magnesium hydroxide in polyolefin resin, to improve the compatibility with resin, and to prepare composites with excellent mechanical properties and flame retardancy.
The unmodified Magnesium hydroxide have higher surface energy and smaller particle size, which can lead to serious agglomeration among the particles. The modified Magnesium hydroxide, though also small in size, are coated with organic matter, which reduces surface energy and thus stabilizes the particles, making them more dispersed.
In addition, appropriate amount of hyperdispersant can achieve uniform dispersion of Magnesium hydroxide in the composite, thus improving the flame retardancy of the composite.