High-flowability polyamide based halogen-free flame-retardant heat-conducting composite material and preparation method thereof

Abstract

The invention discloses a high-flowability polyamide halogen-free flame-retardant heat-conducting composite material and a preparation method thereof. A novel halogen-free flame-retardant heat-conducting composite material is prepared by using high-flowability nylon 6 resin with a branch chain structure as a base body, adding additives such as heat-conducting fillers, a halogen-free flame retardant, an antioxidant and a coupler, and preparing the material through a double-screw melt blending technology. The halogen-free flame-retardant heat-conducting composite material has the characteristics of good heat conductivity, high melt flowability, good environment-friendly and flame-retardant performances, excellent insulation and mechanical comprehensive performances and the like; an obtained product is high in heat-radiating speed, high in strength, low in warping degree and resistant to high temperature and ageing; the composite material can be widely applied to the field of electric plastic parts with higher heat-radiating requirements such as locomotive compartment illumination lamp covers, auto and civil LED heat radiators, household appliance motor shells, notebook power, micro-projector shells, transformer coil frameworks and the like.

Description

technical field [0001] The invention relates to a high-fluidity polyamide-based halogen-free flame-retardant and heat-conducting composite material and a preparation method thereof. Background technique [0002] Polyamide composite materials are widely used in electronic appliances, mechanical equipment and other fields due to their excellent comprehensive performance. Such parts play the role of structural parts and functional parts at the same time. With the development trend of light weight and miniaturization of electronic equipment, the density of electronic assembly is increasing rapidly, which requires that the heat generated by components in the working process must be dissipated and conducted in time, otherwise it will affect the energy efficiency of the system and the service life of the product, so it is important for The thermal conductivity of the material puts forward higher requirements. However, the thermal conductivity of polyamide is only 0.23W / (m.K), whic...

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Problems solved by technology

Metal oxide thermally conductive fillers are the first choice for preparing filled composite materials because of their good insulation performance and low cost. However, the preparation method has the following difficulties and defects: on the one hand, the metal oxide thermally When the content is low, the thermal conductivity of the composite material cannot meet the requirements, and when the filler content is too high (greater than 70 wt %), the melt fluidity of the composite material is too poor to be processed; on the other hand, because the thermally conductive filler is an inorganic Material, the compatibility with the polymer material matrix is ​​not good, resulting in a significant decline in the mechanical properties of the composite material, and the thermal resistance of the interface hinders the improvement of the thermal conductivity

[0004] The patent "Flame Retardant Thermally Conductive Nylon 66 Composite Material and Its Preparation Method" Publication (Announcement) No. -: CN102399442A is based on conventional PA66, and its thermally conductive filler is metal nitride and thermally conductive powder. It is granulated by twin-screw extrusion. The limited fluidity of PA66 melt severely limits the filling amount of fillers in the composite material and the distribution of fillers in the matrix, which affects the formation of heat-conducting network chains, resulting in limited thermal conductivity of the composite material; the fluidity of the composite material is poor, Affect the processing performance of the material and the appearance of the product

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