The thermal conductivity is uniformly filled with thermal matrix material using the thermal conductivity to improve its thermal conductivity. The heat conduction performance is mainly measured by the thermal conductivity (unit: W/m.k). Thermal conductivity is divided into heat conductive conductive plastic and thermal insulation plastic. The main components of thermal conductivity include the substrate materials and fillers, and the substrate materials include PPS, PA6/PA66, LCP, TPE, PC, PPA, PEEK, etc.; High -heat carbon powder, etc.
Thermal conductive plastic has the following characteristics:
(1) Uniform heat dissipation, avoid burning spots, reduce local deformation caused by high temperature due to high temperature;
(2) Light weight, 40-50% lighter than aluminum;
(3) It is convenient for molding and processing, no secondary processing;
(4) High degree of product design;
Because the molding method is mainly molding molding, the rubber is flowing into the mold after heating, and then cooled. The characteristics of the processing process make the heating coefficient of the material showing the characteristics of the opposite sex, that is the direction of the glue flow during injection and the direction of the vertical glue flow. Generally, the thermal conductivity in the direction of the glue flow is 3-6 times than that of the thermal conductivity in the flowing direction of vertical rubber. This difference is caused by the injecting molding of the rubber when it is easily formed in the flow direction.
High -purity of magnesium oxide, good whiteness, small granularity and uniformity, and good decentralization, can be used for thermal conductivity of thermal silicon film, thermal conductivity (PA6, PP, PPS, ABS), etc. The amount can reach 70-80 parts, and the maximum heating rate can reach 5W/m.k. The results show that when the amount of magnesium oxide is less than 200 parts, the thermal guidance and tensile strength of the small particle size magnesium oxide filling silicon rubber is greater than the large particle size of magnesium oxide, while the stretching rate is the opposite; the large particle size is the opposite; the large particle size; Magnesium oxide/small particle size magnesium oxide and the use ratio of silicon rubber at 100/100 is the largest; adding an appropriate amount of silane coupling agent is conducive to increasing the thermal guidance of silicon rubber. The amount of magnesium is 0.5%. In PA, PP, PES, add 40-50% magnesium oxide, which can greatly improve the thermal conductivity of plastic.
Post time: Nov-29-2022