HC Plastics News: ● Graphene has excellent electrical conductivity and long diameter.

● When graphene is added to plastic, it can increase the thermal conductivity of plastic by more than 10 times.

●The mechanical strength of graphene is 100 times that of steel, which can greatly improve the mechanical properties of plastics.

● Graphene surface modification can be added with different groups to make smart materials.

The pace of the CPRJ&SPE New Materials Summit is getting closer and closer, and preparations are in the intensive preparation phase. This is an annual event that brings together elites in the field of additives and modified plastics at home and abroad. Many industry giants have confirmed their participation in the forum.

Dr. Hou Shifeng, the national special expert of the “Thousand Talents Program” and the chairman of Jining Lite Nanotechnology Co., Ltd., will present the keynote report on “Application Prospects of Graphene in Polymer Composites and Automotive”. Before the meeting, CPRJ specially interviewed Dr. Hou Shifeng, Dr. Hou shared his insights on the development opportunities brought by graphene for the plastics industry and the current direction of industrialization research. Let us take a quick look.

Hou Shifeng said that graphene itself has excellent thermal, electrical and mechanical properties. Adding to plastic can improve the performance of plastics and give plastics new functions.

"The plastics industry can make full use of the functional characteristics of graphene, develop functional plastics with special properties, expand the application and utilization of plastics, and further enhance the performance of the traditional five general-purpose resins and five engineering plastics, achieving high-grade plastic engineering and engineering plastics. The goal of performance, and further increase the added value of plastics, bring new profit growth points to the plastics industry, promote the transformation and upgrading of the traditional plastics industry, and promote the conversion of old and new kinetic energy." Hou Shifeng said.

For the industrialization and research direction of graphene, Hou Shifeng believes that graphene will be widely used in five aspects: antistatic functional plastics, thermal conductive functional plastics, high-strength plastics, high-gas barrier plastics, and high-ion selective transmission of plastic films.

Antistatic plastic

The plastic itself is an insulating material with a surface resistance of up to 1013 Ω, which limits its large-scale application in the fields of anti-static and conductive. Graphene has excellent electrical conductivity and long diameter, and is filled into a plastic matrix to obtain a plastic having a high electrical conductivity and a low permeation concentration. At present, the surface resistance of conductive PVC masterbatch of Shandong Lutai Holding Group is adjusted from 101 to 1010 Ω, which utilizes the high electrical conductivity of graphene, while improving electrical properties, mechanical properties and thermal stability. Great improvement.

Thermally conductive plastic

The thermal conductivity of plastics is very low, thus limiting its wide application in the field of heat conduction. The interfacial coupling between graphene and plastic and the thermal conductivity of graphene itself determine the thermal conductivity of graphene modified plastics. When graphene is added to the plastic, the thermal conductivity of the plastic can be increased from 0.1 to 0.5 W/m·K to 5 to 10 W/m·K, which is more than 10 times, so that the plastic can be applied to the heat sink of the LED lamp. The field of automotive heat sinks, electronic and electrical heat sinks, etc., replaces some of the common heat-dissipating materials such as metal aluminum, promotes the weight reduction of devices, and expands the application fields of plastics.

High strength plastic

The mechanical strength of graphene is 100 times that of steel, which can greatly improve the mechanical properties of plastics. Ordinary foam EPS has low mechanical strength and limits some of its applications. Graphene is added as an additive to EPS, and its mechanical strength is increased by more than 2 times. At present, there are already applications of graphene in the field of foamed plastics, and it is applied to packaging, military and other fields. There are also high-strength properties of graphene, the development of new graphene cars, the use of graphene composite plastics as the skeleton and structural parts of automobiles, which greatly reduces the weight of automobiles and saves energy.

High gas barrier plastic

Graphene is a two-dimensional sheet structure material with an ultra-large specific surface area and excellent barrier properties to gas molecules. After being added to plastics, the network structure provides a curved channel for gas diffusion and prolongs the gas diffusion path. It can greatly improve the gas barrier properties of plastics. In the field of plastic sealing, the addition of graphene can develop plastic sealing rings and seals that are resistant to certain pressures.

Ion selective through plastic film

After surface modification of graphene, different groups can be added, and smart materials can be made through the selection and arrangement of specific groups. For example, a membrane that is permeable to water but impervious to oil can achieve oil-water separation and is used in oil pollution treatment and other fields. It is used in industrial wastewater treatment, seawater desalination, salt chemical and other fields through water-permeable but metal-impermeable membranes.

Editor in charge: Wang Ning 12

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