Study on the synergistic flame retardant effect of arylboronic acid derivatives and magnesium hydroxide

Exploring efficient flame retardant systems is essential for improving material safety. The synergistic flame retardant properties of aryl boronic acid derivatives and magnesium hydroxide (Mg(OH)₂) provide new ideas for the development of new flame retardant materials.

Characteristics of aryl boronic acid derivatives

Thermal stability: Stable at high temperatures, which helps capture free radicals in flames.

Release of active groups: Release free radicals such as B-O to inhibit combustion.

Formation of protective layer: Form a protective film on the surface of the material to isolate oxygen and fuel.

Characteristics of magnesium hydroxide

High thermal stability: Decomposition begins above 340°C to maintain flame retardant effect.

Endothermic reaction: Absorb heat during decomposition to reduce temperature.

Water vapor generation: Dilute oxygen and combustible gases to inhibit combustion.

Neutralization of acidic gases: Reduce harmful gas emissions.

Synergistic flame retardant mechanism

Physical barrier: Water vapor and protective layer jointly enhance the physical barrier.

Chemical synergy: Active groups interact with magnesium hydroxide decomposition substances.

Catalytic effect: Magnesium hydroxide may catalyze the decomposition of aryl boronic acid derivatives.

Multi-stage flame retardant: Combining endothermic decomposition and free radical capture ability.

Example

**Tris(4,4',4″-triboric acid-phenyl)amine (3BzN-3B)** and Mg(OH)₂ are compounded in epoxy resin (EP) to significantly improve flame retardancy.

**2,4,6-Tris-(4-boric acid-2-thiophene)-1,3,5-triazine (3TT-3BA)** and Mg(OH)₂ show good synergistic effect.

The compounding of aryl boronic acid derivatives and magnesium hydroxide not only enhances the overall performance of flame retardants, but also helps to reduce dosage and reduce material