Aluminum hydroxide micropowder has three functions of flame retardant, smoke elimination and filling, it has no secondary pollution during combustion, good heat stability, no toxicity, no corrosive gas, less smoke generation, good flame retardant effect, etc. Flame retardants and fillers are widely used in wire and cable.

The effect of mixing uniformity on the performance of aluminum hydroxide wire and cable materials:

In order to meet the standard flame retardant requirements of halogen-free low-smoke wire and cable, it is necessary to add about 50% of aluminum hydroxide. The aluminum hydroxide fine powder is powdery particles with a particle diameter d50 of less than 2um, and the polymer is generally 2-3mm. Granules, the difference in particle size between the two, and inorganic and organic matter, respectively, so whether the uniformity of material mixing during the mixing process will directly affect the mechanical and flame retardant properties of wire and cable 。

With the increase of aluminum hydroxide content, the mixing torque is increasing, making the mixing uniform more difficult, the break elongation of  wire and cable is gradually reduced, and the melt flow rate is decreased. For example, when the mixing time is short or the material viscosity is high and it is difficult to mix during the raw material mixing process, the change of each component in the wire and cable pellets may result in unsatisfactory product mechanics or flame retardant performance, and unqualified products may appear. Therefore, whether the uniformity of material mixing during the mixing process will affect the performance of the wire and cable pellets.

The effect of the fusion of aluminum hydroxide and organic materials in the mixing process affects its mechanical properties. In order to determine the influence of the mixing time on the performance of the wire and cable masterbatch, it is concluded through experiments that the mixing time is less than 120 seconds. The tensile strength and elongation at break were significantly lower and were substantially normal after 180 seconds. Therefore, the mixing of the materials must be completed after the torque reaches the maximum value, that is, the materials are uniformly mixed and the plasticizing process is completed. This ensures the mutual integration of the materials and the stability of the product performance.

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