Thermal conductive polymer composites attract lots of research due to the continuous miniaturization and multi-function of electronic equipment. As a common ceramic, Al2O3 owns relatively high thermal conductivity, high electrical resistivity and satisfactory cost performance, which is considered as the high-quality filler to prepare thermal conductive and electrical insulated composites. This paper reviews current progress in the development of Al2O3 reinforced polymer composites. We firstly summarize the preparation methods of spherical Al2O3, then heat conduction mechanisms and main factors affecting thermal conductivity are introduced. Next, we focus on the common research of Al2O3 in improving the thermal conductivity of polymers, including surface modification, filler hybridization and construction of Al2O3 network by various processing methods, and some emerging applications of thermal conductive polymer composites are introduced subsequently. After a critique of recent studies, we identify several outstanding issues must be addressed if higher thermal conductivity is fully realized.

Recent progress of thermal conductive ploymer composites: Al2O3 fillers, properties and applications

Electrically insulating, layer structured SiR/GNPs/BN thermal management materials with enhanced thermal conductivity and breakdown voltage

Preparation of highly thermally conductive but electrically insulating composites by constructing a segregated double network in polymer composites

MgO nanoparticles-decorated carbon fibers hybrid for improving thermal conductive and electrical insulating properties of Nylon 6 composite

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High thermal conductivity and low electrical conductivity tailored in carbon nanotube (carbon black)/polypropylene (alumina) composites

The invention relates to a thermal conductive insulation plastic with low viscosity and high thermal conductivity and a preparation method thereof, and belongs to the technical field of thermal conductive insulation plastic preparation. The thermal conductive insulation plastic is composed of the following components in parts by weight: 100 parts of polymer resin, 60 to 180 parts of inorganic powder, 15 to 30 parts of chemically bonded graphene/carbon nanotube multi-arm thermal conductive filling material, 1 to 3 parts of coupling agent, 0.2 to 10 parts of lubricant, and 0.1 to 0.2 part of antioxidant. The preparation method comprises the following steps: pre-drying polymer resin, inorganic powder, and chemically bonded graphene/carbon nanotube multi-arm thermal conductive filling material, stirring all raw materials in a high speed stirring machine for 1 to 1.5 hours so as to evenly mix all raw material; transferring the mixture to a double screw granulator, extruding and granulating the mixture, and after granulating, drying the granules to obtain finished product of thermal conductive insulation plastic. The provided preparation method can obtain an insulation material with high thermal conductivity, at the same time, the original mechanical properties can be maintained, moreover, the preparation technology is simple, the equipment requirement is low, the conditions can be easily controlled, the cost is low, and the method is suitable for industrial production.

Thermal conductive insulation plastic with low viscosity and high thermal conductivity and preparation method thereof

The invention relates to a preparation method for a high-crystallinity bidirectional high-mechanical strength polylactic acid film, which belongs to the technical field of resin films. The preparation method comprises the following steps: extruding polylactic acid through a single-screw extruder; after extrusion of polylactic acid from a mouth mold, applying polylactic acid onto a tape-casting roller rotating at a high speed and having a temperature of 50 to 100 DEG C by using air-cooling technology; then allowing polylactic acid to pass through a cooling roller with a temperature of -20 to 60 DEG C; and then carrying out reeling and film formation. The method employs melt drawing and solid phase secondary drawing technology and can prepare the high-crystallinity bidirectional high-mechanical strength polylactic acid film with a mutually-perpendicular crystal structure.

Preparation method for high-crystallinity bidirectional high-mechanical strength polylactic acid film

The invention discloses a water-borne sizing agent for carbon fiber. The water-borne sizing agent is prepared from 5-10% of epoxy resin modifier, 10-25% of epoxy resin, 65-80% of deionized water and 1-5% of auxiliary. The invention further provides a preparation method of the water-borne sizing agent for the carbon fiber. According to the preparation method, a certain amount of epoxy resin and modifier are taken and subjected to reaction for 1-3 hours to prepare anionic modified epoxy resin, and then a certain amount of deionized water is dripped and other auxiliaries are added to prepare the anionic water-borne epoxy sizing agent for the carbon fiber. The invention further provides a sizing method of the water-borne sizing agent for the carbon fiber. According to the epoxy carbon fiber sizing agent, the emulsion particle diameter is small, particle diameter distribution is narrow, and stability is high; through strict control over reaction conditions, when the carbon fiber subjected to sizing is used for preparing a PA6 (nylon 6) composite material, the adhesion force at the interface between the carbon fiber and resin is enhanced, wear resistance is improved, and tensile strength, bending strength and other properties are greatly improved.

Water-borne sizing agent for carbon fiber and preparation method and sizing method thereof

The invention discloses a microcapsule flame retardant with high heat resistance and a preparation method of the microcapsule flame retardant. A core material adopts a flame retardant, a capsule material is a polyphosphazene cross-linked polymer obtained through a reaction of phosphonitrile with one or more of biphenyl polyamine, condensed aromatic polyamine and heterocyclic aromatic polyamine, and the mass ratio of the capsule material to the core material is (0.1:1)-(5:1). According to the preparation method, the flame retardant is dispersed in a solvent, phosphonitrile and one or more of biphenyl polyamine, condensed aromatic polyamine and heterocyclic aromatic polyamine are added, an acid-binding agent is added, the mixture reacts, and the microcapsule flame retardant is obtained. The capsule material contains a large quantity of aromatic structures, chemical weak bonds can be avoided, and the microcapsule flame retardant has higher heat resistance and good char forming performance; the capsule material contains a polyphosphazene cross-linked structure body with more nitrogen and phosphorus and imino groups, has the synergic nitrogen and phosphorus flame retarding characteristic and has a better time-sharing flame retarding effect with the core material; the aromatic structures contained in the capsule mateiral have good compatibility with a polymer matrix containing an aromatic ring on a main chain, the mechanical performance of the composite is excellent, and no remarkable dyeing effect is caused to the polymer matrix.

Microcapsule flame retardant with high heat resistance and preparation method of microcapsule flame retardant

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