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Halogen-free flame retardant aluminum hydroxide and magnesium hydroxide

 The amount of aluminum hydroxide AL(OH)3 is more than 40% of the total amount of the flame retardant used. Aluminum hydroxide itself has three functions of flame retardant, smoke elimination and filling. Because it is non-volatile, non-toxic, and can produce synergistic flame retardant effect with various substances, it is known as pollution-free inorganic flame retardant. However, aluminum hydroxide has the disadvantage of increasing the amount of addition, and usually needs to be added more than 50% in order to have a good flame retardant effect. In order to overcome this shortcoming, the granulation technique can be used to develop in the direction of ultra-fineness, which is to narrow the particle size distribution; to improve the encapsulation technology to improve the dispersibility in the polymer; and to use macromolecular bonding treatment .

Magnesium hydroxide Mg(OH)2 is an additive flame retardant that is currently developing rapidly. It is low-smoke, non-toxic, and can neutralize acidic and corrosive gases during combustion. It is an environmentally friendly green flame retardant. Agent. Its flame retardant mechanism is similar to that of AL(OH)3. Compared with AL(OH)3, the decomposition temperature of Mg(OH)2 is 100-150C higher than that of AL(OH)3, which can be used for the flame retardancy of engineering plastics with processing temperatures higher than 250C, and also promotes the formation of carbon into polymers. The role, but to achieve a certain flame retardant effect, the amount of addition needs to be more than 50%, which has a great impact on the performance of the material. In order to reduce the amount of Mg(OH)2 added in the polymer, one method is to refine the Mg(OH)2 particles, and the other method is to modify the surface of Mg(OH)2 by coating technology to improve Its compatibility with polymers.

 

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