Effect of Temperature on the Particle Size of Aluminum Hydroxide Flame Retardant

As a chemical substance, aluminum hydroxide flame retardant is subject to certain influencing factors during use. For instance, environmental temperature can induce chemical changes in its particle size. Therefore, proper temperature control is essential during both usage and storage. Below, we will explain how temperature affects particle size.

Aluminum hydroxide flame retardant prepared by neutralizing sodium aluminate with dilute nitric acid. The particle size of the flame retardant slurry obtained at different neutralization temperatures varies depending on the aging duration.

When neutralized at 40°C, particle size decreased regardless of aging temperature, indicating low-temperature aging is suitable. However, after neutralization at 75°C, aging at different temperatures had negligible effects on particle size, with minimal variation observed, thus low-temperature aging remains viable.

Under high-temperature neutralization at 70°C, the median particle size of aluminum hydroxide flame retardant is 28-30 μm. Neutralization at 50°C yields a median particle size of 17-20 μm. At this point, the influence of aging temperature on particle size is significantly less pronounced than that of neutralization temperature.

To obtain aluminum hydroxide flame retardant with larger particles, neutralization can be conducted at lower temperatures while minimizing aging time. Typically, 0.5 hours suffices. At higher temperatures, aging duration has minimal impact on particle size, allowing 0.5-1 hour as needed.

Thus, we observe that different temperatures yield varying particle sizes for aluminum hydroxide flame retardants, and products with distinct particle sizes deliver differing performance outcomes. When selecting products, prioritize choosing chemical formulations with appropriate particle sizes based on specific application requirements to ensure optimal results.