Hebei Messi Biology Co., Ltd. stated that adding 40-50% high-purity spherical magnesium oxide to thermally conductive plastics such as PA, PP, and PES can greatly improve the thermal conductivity of the plastic. Thermal conductive fillers are used to evenly fill the polymer matrix material to improve its thermal conductivity. The quality of thermal conductivity is mainly measured by thermal conductivity coefficient (unit: W/m.k). Thermal conductive plastics are divided into two major categories: thermally conductive and electrically conductive plastics and thermally conductive insulating plastics. The main components of thermally conductive plastics include matrix materials and fillers. Base materials include PPS, PA6/PA66, LCP, TPE, PC, PP, PPA, PEEK, etc.; materials include AlN, SiC, Al2O3, graphite, fibrous high thermal conductivity carbon powder, scaly high thermal conductivity carbon powder, etc.
Application characteristics of high-purity spherical magnesium oxide in thermal conductive materials: (1) Uniform heat dissipation, avoiding hot spots, and reducing local deformation of parts caused by high temperatures; (2) Light weight, 40-50% lighter than aluminum; (3) The molding process is convenient and no secondary processing is required; (4) The product design has a high degree of freedom; (5) Since the molding method is mainly mold injection molding, the rubber material flows into the mold under pressure after heating, and then is cooled and formed. The characteristics of the processing technology make the thermal conductivity of the material after molding show anisotropic characteristics, that is, the direction of the rubber flow during injection molding (in-plane) and the vertical direction of the rubber flow (through-plane). Generally, the thermal conductivity in the direction of rubber flow is 3 to 6 times that in the direction perpendicular to the flow of rubber. This difference is caused by the tendency of rubber to form continuous molecular chains in the direction of flow during injection molding.
Hebei Messi Biology Co., Ltd. stated that when developing and producing the shape of magnesium oxide products, the orientation of the fillers should be consistent as much as possible to improve the thermal conductivity efficiency of the composite materials. In contrast, due to the isotropy of the spherical structure, spherical magnesium oxide has more advantages in improving the thermal conductivity of composite materials than rod-shaped or sheet-shaped structures. At the same time, the particle size of spherical magnesium oxide particles is small and evenly distributed. The surface morphology is regular and the packing density of the powder is significantly increased. It can greatly improve the fluidity and dispersion of the powder and eliminate the influence of agglomeration to the greatest extent. Improve the defects inside the powder.