Polymer composite material containing micro-nano hybrid structure filler, and preparation method thereof

Abstract

The invention discloses a polymer composite material containing a micro-nano hybrid structure filler, and a preparation method thereof, wherein the composite material is composed of graphene nanosheets, magnesium salt whiskers and a polymer matrix. According to the invention, a stable, perfect and efficient heat-conducting network chain is constructed in a polymer matrix by adopting an organic-inorganic hybrid composed of multi-scale and multi-dimensional graphene nanosheets and magnesium salt whiskers, so that the heat-conducting property of the composite material is greatly improved under the condition of low filler addition amount while good melt processability is ensured; the hybrid structure filler also has good reinforcing and toughening effects on the composite material, and significantly improves the comprehensive mechanical properties of the composite material; and the method is simple in production process, easy to implement, rich in raw material source, safe, environment-friendly and low in production cost.

Description

technical field [0001] The invention relates to a polymer composite material containing a micro-nano hybrid structure filler and a preparation method thereof, in particular to a polymer composite material with high melt strength, high thermal conductivity, and high mechanical properties and a preparation method thereof. The invention belongs to the field of functional polymer composite materials. Background technique [0002] In recent years, with the rapid development of microelectronic packaging technology and integration technology, the output power of electronic components has become larger and smaller, and the high heat environment generated by heat accumulation will make the device's working stability poor and its life shortened. Therefore, the electronics industry puts forward higher requirements for the heat management system, and the heat conduction parts must be able to quickly dissipate the heat to avoid damage to the service life of the equipment. Although polym...

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Problems solved by technology

There are some obvious deficiencies in this method: the preparation process of the star-shaped carbon black-carbon nanotube thermally conductive filler with multiple conductive spots is extremely complicated and time-consuming, and a large amount of organic solvents such as strong acid, tetrahydrofuran and DCC are needed; processing in high-concentration strong acid, It is very likely to destroy the structure of carbon nanotubes and reduce the aspect ratio (CrystEngComm 2012, 14, 4976-4979.), resulting in an increase in the thermal resistance of the carbon nanotube-matrix interface, which is not conducive to the formation of thermal network chains and the improvement of thermal conductivity of composite materials (Composites Part A: Applied Science and Manufacturing 2016,82,208-213.); the addition of thermally conductive filler is too large (the addition of the best embodiment and the matrix mass ratio are 111:100), which will affect the processing performance of the polymer matrix Damage, especially not suitable for the production of fibers, pipes, films and other products that require high melt strength

In addition to the need to use high-cost graphene oxide, this method also has some obvious shortcomings: in a preferred embodiment, in order to obtain a high thermal conductivity of the composite material (> 5W / mW), the inorganic thermal conductivity filler that needs to be added More than 65 parts, while the mass parts of the polyamide matrix is ​​less than 25, it is likely to cause great difficulties in the molding processing of composite materials and the shaping of complex products

However, there are some obvious defects in the preparation method of magnesium salt whiskers reported at present, for example, Du Juan et al. of Tsinghua University disclose a method for preparing magnesium oxide whiskers by an alcohol-hydrothermal method (Chinese Invention Patent Publication No. CN103088400A), but need to use a large amount of alcohol additives (accounting for 20-80% of total solution volume), the diameter distribution of gained whisker is uneven (0.62-1.49 μ m), length is on the low side (14.8-25.1 μ m), surface activity Not sure; people such as Jiang Yuzhi of Shenyang University of Technology disclosed a method for preparing nano-magnesium hydroxide whiskers by using basic magnesium sulfate whiskers (Chinese Invention Patent Publication No. CN103849924A), but sulfuric acid and sodium hydroxide need to be used. It is easy to cause the danger of production and the pollution of strong acid and strong alkali, and the surface activity of whisker products is also uncertain

In the prior art literature, the outstanding contribution of these whisker products in improving thermal conductivity in polymer composites is rarely reported.

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