● Graphene has excellent electrical conductivity and a large aspect ratio.
● When graphene is added to plastic, the thermal conductivity of plastic can be increased 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 attached to different groups to make intelligent materials.
CPRJ & SPE new material summit is getting closer and closer, preparation has entered a busy preparation phase.This is an annual gathering of domestic and foreign additives and modified plastics industry elite, many industries have confirmed to participate in the forum coffee.
CPPCC special report will be presented by Dr. Hou Shifeng, Chairman of Jining Litvin Technology Co., Ltd., and a forerunner of "Application Prospect of Graphene in Polymer Composites and Vehicles" Interview with Dr. Hou Shifeng, Dr. Hou on the graphene for the plastics industry brought the opportunity for development and the current direction of industrial research share insights, let us first take a quick look.
Hou Shifeng said that graphene itself has excellent thermal, electrical and mechanical properties, added to the plastic can fully improve the performance of plastics, plastic and give new functions.
'The plastic industry can make full use of the functional characteristics of graphene to develop functional plastics with special properties and expand the application and utilization of plastic so as to further improve the performance of the five general-purpose resins and the five engineering plastics and achieve common plastic engineering and high engineering plastics Performance goals, and to further increase the added value of plastic, plastic industry to bring new profit growth point, 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 exert its utmost in five aspects: anti-static functional plastic, thermal plastic, high-strength plastic, high gas barrier plastic and high ion-selective plastic film.
Anti-static function of plastic
Plastic itself is an insulating material, the surface resistance of up to 1013Ω above, limiting its anti-static, conductive fields such as large-scale application of graphene has excellent conductivity, and the larger diameter ratio, filled into the plastic matrix can be high The conductivity of low percolation concentration of plastic currently Shandong Lutheran Holding Group's conductive PVC masterbatch surface resistance can be adjusted from 101 to 1010Ω range is the use of graphene's high conductivity properties, At the same time, mechanical properties, thermal stability is also greatly improved.
Thermal plastic
The low thermal conductivity of plastics limits its widespread use in the field of heat transfer.The interfacial coupling between graphene and plastic and the thermal conductivity of graphene itself determines the thermal conductivity of graphene-modified plastics.Graphite Add to the plastic, the plastic can make the thermal conductivity of 0.1 ~ 0.5W / m · K, to 5 ~ 10W / m · K, increased by 10 times more, so that the plastic can be applied to the LED lamp heat sink, car cooling Parts, electrical and electronic cooling shell and other fields, replacing part of the metal aluminum and other commonly used thermal materials, lightweight devices to promote the expansion of plastic applications.
High-strength plastic
The mechanical strength of graphene is 100 times that of steel, which can greatly improve the mechanical properties of plastics.Excellent mechanical strength of ordinary EPS foams is limited, which limits its application areas.Glygraphene is added to EPS as an additive and its mechanical strength is increased More than 2 times, there are already graphene in the field of foam plastics applications, and used in packaging, military and other fields.Also have the use of graphene's high-strength properties, the development of new graphene cars, the use of graphene composite plastic as a car The skeleton and structural parts, significantly reducing the weight of the car, saving energy.
High gas barrier plastic
Graphene is a two-dimensional sheet structure material with an extremely large specific surface area and excellent barrier properties to gas molecules. After being added to the plastic, the network structure provided provides a tortuous path for gas diffusion and prolongs the gas diffusion path , Can greatly improve the gas barrier properties of plastics in the field of plastic seals, add graphene can develop a certain pressure resistant plastic seals, seals.
Ion-selective through the plastic film
Graphene surface modification can be attached to different groups, through the selection and arrangement of specific groups to make intelligent materials, such as: can be permeable to water but not through the oil film, oil-water separation can be applied to the oil treatment , Etc. Water-permeable but not permeable metal ion-based membranes are used in industrial wastewater treatment, seawater desalination, salt chemical and other fields.