Mixing And Dispersion Of Epoxy Resin/alumina Thermal Conductivity Composites
Epoxy resin has the advantages of excellent adhesion, mechanical properties, electrical insulation, chemical stability, easy molding, good stress transfer and low cost. It has been widely used in aerospace, electronics and other fields. With the gradual development of electronic components in the direction of miniaturization, integration and multi-function, higher requirements are put forward for the thermal conductivity of electronic components materials.
Alumina (Al2O3), silicon nitride (Si3N4), aluminum nitride (AlN), silicon carbide (SiC) and other fillers have high thermal conductivity, which can be used to fill and modify epoxy resin to obtain epoxy resin composites with good insulation. The surface modification of thermal conductive filler Al2O3 is carried out with titanate coupling agent NDZ-201 and silane coupling agent KH-560, and EP/Al2O3 thermal conductive composite is prepared by pouring method. The effects of Al2O3 dosage and coupling agent treatment on mechanical properties and thermal conductivity of composites are investigated. The calculation model of the thermal conductivity of EP/Al2O3 composites is discussed, which provides a basic theoretical basis for improving the thermal conductivity of EP/Al2O3 composites.
Experiment:
1. Main materials
Epoxy resin E-51, ethyl-4-methylimidazole, dimethylbenzylamine, alumina thermal conductivity 32W/(m·K) titanate coupling agent (NDZ-201), silane coupling agent (KH-560); Acetone.
2, EP/Al2O3 thermal composite preparation
Put a certain amount into the cup according to the ratio, and mix and defoam through ZYE planetary mixer;
The fineness is below 5 microns after grinding by ZYE three roller mill ZYTR-80E
3. Conclusion:
The thermal conductivity of EP/Al2O3 composite increases with the increase of the amount of Al2O3. When the mass fraction of Al2O3 is 50%, the thermal conductivity of the composite is 0.68W/(m·K). The bending strength and impact strength of the composite increase first and then decrease with the increase of the amount of Al2O3. When the mass fraction of Al2O3 is 5%, the mechanical properties of the composite are the best. The thermal conductivity and mechanical properties of the material were further improved by surface modification.
Because the viscosity is too high, the traditional mixing is difficult to mix it evenly, and the bubbles are not easy to remove. At the same time, due to the high hardness of alumina, the traditional grinding method will rub the metal into debris and cause pollution to the material. Non-intervention-type planetary mixer can solve the above problems very well, and the material is mixed evenly and vacuum defoamed; After grinding and dispersing by three roller mill, the thermal conductivity will be improved, and its stability will be greatly improved.
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