1. Alkaline metal hydroxide
Alkaline metal hydroxide mainly refers to Mg(OH)2.
The decomposition temperature of ATH is 200°C, and the decomposition temperature of Mg(OH)2 is 430°C. Combining the two can make up for ATH’s lower decomposition temperature, which leads to the deterioration of the material’s flame retardancy.
It can also make composite flame retardants. It has always had a good flame retardant effect during the oxidation and decomposition of materials. It is reported that the low addition amount (<30%) of Mg(OH)2 can promote the flame retardancy of ATH, especially it can improve the carbonization effect of the material; when the amount of Mg(OH)2 and ATH are the same, in polypropylene Have the best synergy effect.
2. Synergistic effect with organosilicon compounds
Organosilicon compounds are not widely used in flame retardant polymer materials, but they are also effective synergists for inorganic flame retardants such as ATH.
For example, it has good compatibility with resins. Its addition can greatly reduce the amount of ATH added, thus improving the mechanical properties, thermal stability, and surface finish of the system, even under the condition of high ATH filling.
The rheological properties are still very good. Another report: A silicone composite flame retardant synergist, added in a small amount of EVA/ATH system, its oxygen index is increased, and there is no dripping phenomenon during combustion while maintaining good mechanical properties.