Macromolecule heat conduction and dissipation blended composite material and automatic preparation method

Abstract

The invention discloses a macromolecule heat conduction and dissipation blended composite material. The macromolecule heat conduction and dissipation blended composite material is prepared from, by mass, 35-75 parts of matrix resin, 0-10 parts of flexibilizer, 20-50 parts of heat conduction filler, 0.2-1.0 part of antioxidant 1010, 0.2-1.0 part of phosphite ester antioxidant 168, 0.5-1.5 parts of powder surface activation treating agents and 0.5-1.5 parts of lubricant. An automatic preparation method of the macromolecule heat conduction and dissipation blended composite material includes the steps of firstly, conducting surface treating on heat conduction filler for 20 min through powder surface activation treating agents in a high-speed stirring machine; secondly, making the heat conduction filler enter another high-speed stirring machine through an automatic conveying device to be evenly mixed with other materials; thirdly, automatically conveying the mixture obtained in the second step to an internal mixer to be mixed and kneaded for 15 min; fourthly, making the obtained mixture directly enter a double-screw extruder to be extruded and granulated. The prepared heat conduction and dissipation material has the high mechanical property and heat conduction performance, automatic and continuous production is achieved, a large amount of labor is saved, the production period is greatly shortened, the production cost is greatly reduced, and the macromolecule heat conduction and dissipation blended composite material can be widely applied to the fields of LED illumination, electronic electrical appliances, automobiles and the like where good heat conduction and dissipation performance is required.

Description

technical field [0001] The invention relates to a high-molecular conduction and heat-dissipating blended composite material and an automatic preparation method. Background technique [0002] In recent years, due to a series of excellent properties such as lower density than metals and ceramics, high degree of freedom in product design, and easy processing and molding, polymer thermally conductive composite materials have become increasingly widely used in LED lighting, electronic heat sinks and other fields. This kind of material is mainly made by blending heat-conducting powder such as alumina with a polymer resin matrix, and using the heat-conducting powder to form a heat-conducting network in the polymer resin matrix to achieve the effect of heat dissipation. Its preparation method mainly has two kinds of one-step method and two-step method: one is to mix the heat-conducting powder with resin raw materials and other components, and then directly extrude and granulate thro...

AI Technical Summary

Problems solved by technology

For the first method, due to the high filling amount of thermally conductive powder, it is very easy to cause difficulty in cutting the material during extrusion and granulation, which seriously affects the continuity of production, and easily causes the thermally conductive filler to disperse in the matrix resin Uneven, unable to form an effective heat conduction network, so that the heat conduction performance of the material cannot be effectively improved

In the second method, taking into account the defects of the first method, the heat-conducting powder is mixed with some resin first, which is equivalent to pre-dispersing the heat-conducting powder once, and then extruding and granulating through a twin-screw extruder The secondary dispersion effect of the thermal conductivity powder in the resin matrix is ​​effectively improved, and the thermal conductivity is better. However, due to the addition of banburying and cooling and crushing processes in the middle, it belongs to intermittent production, which not only greatly increases manpower. cost, and prolong the production cycle, leading to a substantial increase in processing costs