Hexagonal flake brucite powder: The key to enhancing the impact strength of aluminum-plastic panels



Among building decoration materials, aluminum-plastic panels are widely used in curtain walls, interior decoration, and advertising signs due to their light weight, good appearance, and easy processing. However, with the complication of usage environments and the improvement of construction requirements, traditional aluminum-plastic panels have gradually revealed certain shortcomings in terms of impact resistance. Especially in the exterior wall systems of high-rise buildings, the panels need to withstand various external impact forces such as wind pressure, hail, and mechanical collisions, which puts forward higher demands on the structural stability of the materials.


In recent years, a hexagonal flake-shaped brucite powder with a special morphology has been introduced into the modification system of aluminum-plastic panel core materials, becoming a key material for enhancing its impact resistance. This unique inorganic filler not only has excellent mechanical reinforcement effects but also possesses multiple advantages such as flame retardancy and environmental friendliness, providing a new technical path for the functional upgrade of aluminum-plastic panels.


I. Structural Characteristics and Reinforcement Mechanism of Hexagonal Flake Magnesium Hydroxide Powder

Brucite is a natural mineral with a chemical composition of magnesium hydroxide (Mg(OH)₂). The general form of brucite powder is mostly irregular granular, while hexagonal flaky brucite has a regular layered structure, presenting a two-dimensional planar feature similar to mica. This special morphology makes it easier to form an oriented distribution in composite materials, thereby playing a role of "bridging" and "stress dispersion".


After adding hexagonal flaky brucite powder to the core material of aluminum-plastic panels, its lamellar structure can form an interlaced network in the polymer matrix, effectively preventing crack propagation and enhancing the material's toughness and impact resistance. Additionally, due to its low surface activity and resistance to agglomeration, it is easier to be uniformly dispersed during the blending process, avoiding performance defects caused by local stress concentration.