Highly filled and thermally conductive PA6/PP composites with good glue adhesion and their applications

Abstract

This application discloses a highly filled and thermally conductive PA6 / PP composite material with good glue adhesion, which includes the following components in parts by weight: PA6 20~40, PP 1~15, thermally conductive filler 35~50, reinforcing filler 5~25, compatibilizer 1~5, toughening agent 1~5, other additives 0.1~5, polyol stearate lubricant 0.1~1. This application uses the alloy of PA6 and PP to solve the problems of poor material fluidity, poor low-temperature toughness and thin-walled multi-cavity processing defects caused by high filling of PA6. This application can make full use of the lubricant performance of the polyol stearate lubricant in the resin processing process, and when the product is bonded to the glue, it can enhance the adhesion with the glue, increase the bulb torque, and meet the performance requirements of the product .

Description

technical field [0001] The invention belongs to the field of polymer compound compositions, and in particular relates to a highly filled and thermally conductive polymer compound composite material. Background technique [0002] Thermally conductive materials are often used in heat dissipation devices in the LED lighting industry. With the development of the industry, the requirements for material cost reduction, heat conduction and flame retardancy are getting higher and higher. The high filling of fillers can improve the thermal conductivity and flame retardancy of materials, therefore, more and more formulations of thermal conductive materials have been extensively studied. Usually, the proportion of thermally conductive materials and reinforcing fillers is more than 40% to meet the demand, but the fluidity and toughness of highly filled materials are very poor, and thin-walled products are difficult to process and brittle, especially in white thermally conductive materia...

AI Technical Summary

Problems solved by technology

[0004] 1) Due to the requirement of heat conduction, the proportion of thermally conductive filler and reinforcing filler in thermally conductive PA6 material is relatively high, usually above 50%, which will lead to poor fluidity of the material;

[0005] 2) PA6 heat conduction material has poor low-temperature toughness in winter, which is mainly manifested as assembly cracking. In the case of high filling, the material toughness is further reduced, and casting problems will occur during hot runner processing;

[0006] 3) When the PA6 thermal conductive material adopts the thin-walled multi-cavity processing mode, there will be processing defects such as difficulty in filling, lack of glue, etc.

For example, consider adding a polar lubricant to solve the problem, such as choosing the commonly used lubricant EBS with strong polarity; although the coupling agent has a certain polarity, it can also improve the surface polarity of the material to a certain extent, but it will be more It greatly affects the fluidity of the material, and the coupling agent is usually a liquid raw material, the production cost is high, and the production equipment is difficult to clean

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