Heat-conducting composite filler, preparation method thereof, heat-conducting thermoplastic resin composite material thereof and application of heat-conducting thermoplastic resin composite material

Abstract

The invention provides a hydrophobic heat-conducting thermoplastic resin composite material which is easy to clean and easy in injection molding processing, the composite material comprises thermoplastic resin, a composite heat-conducting filler, a flexibilizer, an antioxidant, a surface modifier and the like, and the composite heat-conducting filler is composed of a heat-conducting main material and a heat-conducting auxiliary material. According to the heat-conducting thermoplastic resin composite material provided by the invention, by regulating and controlling the formula and introducing the composite heat-conducting filler, the heat-conducting thermoplastic resin composite material which is hydrophobic, easy to clean and easy to perform injection molding processing is prepared, and meanwhile, due to the synergistic effect of different components of the composite heat-conducting filler, the heat-conducting thermoplastic resin composite material is uniform in dispersion and improved in heat-conducting property; and the prepared heat-conducting thermoplastic resin composite material has excellent comprehensive mechanical properties and can be widely applied to the fields of LED (Light Emitting Diode) illumination, communication equipment and the like.

Description

technical field [0001] The invention relates to the field of polymer composite materials, in particular to a heat-conducting composite filler, a preparation method thereof, and a heat-conducting thermoplastic resin composite material and application thereof. Background technique [0002] With the rapid development of the consumer electronics industry, the integration and performance of electronic components are getting higher and higher, and the heat generation is also increasing, which has given rise to the demand for new functional thermal conductive materials. Thermally conductive polymer composite materials are widely used in circuit packaging, consumer electronics, LED lighting, communication equipment, energy storage, aerospace and other fields. Compared with thermally conductive metal materials and inorganic non-metallic materials, they have low density and are easy to process and shape. , low price, good corrosion resistance, easy recycling and other advantages, so i...

AI Technical Summary

Problems solved by technology

Chinese patent CN104140670A discloses a high thermal conductivity nylon composite material and its preparation method. The composite material is composed of 40-80 parts of nylon, 10-60 parts of thermal conductive filler (expanded graphite) and 0-6 parts of reinforcing filler (mesophase pitch) , but the thermally conductive filler needs to be calcined at a high temperature of 500-950°C, the process is complicated and energy-consuming, and the mechanical properties of the obtained nylon composite material are poor, and the tensile strength is only 49.7-66.3MPa

Chinese patent CN106380838A discloses a flame-retardant polyamide-based heat-conducting material and its preparation method. The material consists of 45-100 parts of polyamide resin, 75-140 parts of heat-conducting filler, 5-25 parts of glass fiber, Toughening agent, 0.2-5 parts of lubricant, 0.75-3 parts of antioxidant and 0.25-1 part of surface treatment agent. The heat-conducting filler is mainly composed of magnesium hydroxide and heat-conducting auxiliary materials. This method has a strong Hygroscopicity, causing the composite material to easily absorb moisture and deteriorate, resulting in a decrease in mechanical properties

Chinese patent CN102993688A discloses a method for preparing a hydrophobic nylon composite membrane. The inorganic filler and nylon are dissolved in a solvent, and then the phase inversion method is used to form a membrane to obtain a hydrophobic nylon composite membrane. Nylon raw material formed into film by conversion method, and not suitable for injection molding process, with many application limitations

Chinese patent CN109989128A discloses a nylon fiber with a low surface friction coefficient and improved hydrophobicity and a preparation method thereof. Nylon, PDMS and POSS with branched chain amino groups are melt-extruded through twin-screws. The nylon fiber produced by this method is the same as The water contact angle is greater than 71°, but the mechanical properties are poor

The hydrophobic nylon materials disclosed above all fail to take into account the thermal conductivity, and are not easy to be processed and produced by injection molding, and there are many shortcomings in practical applications.

[0005] In the above-mentioned prior art, thermally conductive thermoplastic resin composite materials can be obtained by adding thermally conductive fillers, but due to the limitations of the properties of the filler itself, it is difficult to prepare composite materials, and the thermal conductivity, mechanical properties and injection molding performance are not good.

At the same time, the thermoplastic resin composite materials prepared by the existing technology cannot achieve the combination of high thermal conductivity and hydrophobic and easy-to-clean performance. However, in application scenarios such as LED lighting and mobile phone casings, materials are required to take into account hydrophobic, easy-to-clean and high thermal conductivity. Therefore, it is necessary to develop a A new type of thermally conductive thermoplastic resin composite material that is hydrophobic, easy to clean, and easy to process by injection molding, and this composite material needs to have excellent mechanical properties to meet the needs of the market

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