PC-PET (Polycarbonate-Polyethylene Terephthalate)-based LED (Light Emitting Diode) heat dissipation material containing modified calcium sulfate whisker-carbon nano tube and preparation method of PC-PET-based LED heat dissipation material

Abstract

The invention discloses a PC-PET (Polycarbonate-Polyethylene Terephthalate)-based LED (Light Emitting Diode) heat dissipation material containing modified calcium sulfate whiskers-carbon nano tubes and a preparation method of the PC-PET-based LED heat dissipation material. Composite plastic is characterized in that high polymer materials such as PC and PET are compounded to be used as thermal conductive plastic base stock, good comprehensive mechanical property is obtained, and insulation and durability are realized; the thermal conductivity of the composite plastic is effectively increased due to added nanocrystalline ceramic powder, calcium sulfate whisker-carbon nano tube composite powder which is doped in the added nanocrystalline ceramic powder and is modified by ionic liquid has low surface free energy and high thermal conductivity, the compatibility of the calcium sulfate whisker-carbon nano tube composite powder with high-polymer plastic is good, and a uniform and efficient thermal conducting network with good thixotropy can be formed in the base stock, so that good heat transfer and heat dissipation effects can be obtained, efficient reinforcing and toughening effects are also obtained, the using performance of the PC-PET-based LED heat dissipation material can be improved, and the PC-PET-based LED heat dissipation material has wide application space in LED packaging.

Description

technical field [0001] The invention relates to the technical field of thermally conductive engineering plastics, in particular to a PC-PET-based LED heat dissipation material containing modified calcium sulfate whiskers-carbon nanotubes and a preparation method thereof. Background technique [0002] As a new generation of light source, LED has the advantages of high efficiency, energy saving, environmental protection, long service life, easy maintenance, etc. It is expected to be the third generation light source that can replace incandescent lamps and fluorescent lamps. There is a direct relationship. The heat dissipation problem is the main problem that limits the improvement of power and luminous efficiency of packaged LED products. The effective way to solve the LED heat dissipation problem is to use materials with high thermal conductivity, high insulation and high transmittance to quickly transfer heat. [0003] At present, the heat dissipation materials commonly used...

AI Technical Summary

Problems solved by technology

[0003] At present, the heat dissipation materials commonly used in LED packaging are mainly metal aluminum or ceramic materials. These materials have some defects in the actual use process. It has problems such as electrical conductivity and single shape. Although ceramic materials are insulating, they have a large specificity and high molding difficulty, which is not conducive to mass production and its application is also limited.

[0004] Composite thermally conductive plastics have gradually attracted the attention of the industry in recent years. First, the plastic itself has the advantages of good insulation, light weight, low price, and diverse shapes. After adding high thermal conductivity fillers, a satisfactory thermal conductivity can be obtained. Compared with The aluminum-based heat dissipation material is lighter in weight and the molding cycle is shorter. Because the unit price of the high thermal conductivity filler is relatively expensive, the existing preparation process makes the utilization rate of the thermal conductivity filler low, which further increases the production cost. Therefore, the existing process should be improved , improving the utilization of raw materials is a matter of waiting for the result