Evaluation Of Industrial Preparation Of Graphene And Its Application In Pressure Sensitive Adhesive

Graphene is a one-atom-thick two-dimensional (2D) material, which is the basic constituent unit of fullerenes, carbon nanotubes and graphite. At 25?, the electron mobility is very high and reach 200000 cm2/(V·S), the specific surface area is 2600 m2/g, the thermal conductivity is very high and reach 5000 W/(m-K), the resistivity is very small, (about 10-6?·cm). The graphene has a unique mechanical properties, its intensity can reach 130 GPa,which is even harder than steel. Graphene is often used as conductive and thermally conductive fillers to enhance the various properties of the composite because of it's excellent properties. Production methods has been improved continuously for the widely applications. The traditional preparation method promoted the development of graphene, but there are some shortcomings. The shortcomings resulting in the application of graphene is limited, but the microwave stripping method can solve the shortcomings of traditional preparation methods of graphene. Besides, the graphene can be prepared on a large scale by a simple process. The structure of graphene prepared by this method has few defects and can be added to the pressure-sensitive adhesive to prepare the heat-conducting pressure-sensitive adhesive, which can be widely used in various fields. Compared with the the thermal pressure-sensitive adhesive prepared by (Al, Cu, Ag and other metal powder filler), metal oxide filler (Al2O3, MgO, etc.) through metal materials (metal ions), non-metallic materials (graphite, carbon black, carbon nanotubes), non-metallic thermal conductive filler (SiC, AIN, Si3N4, etc.), graphene has the characteristics of uniform dispersion, and the most important is to improve the thermal conductivity of pressure sensitive adhesive effectively.The main research contents of this paper are as follows:1. The graphene prepared by industrialization was evaluated and analyzed.The experimental results show that the number of graphene layers prepared by microwave stripping of expandable graphite is small and the purity is high.2. Preparation of polyacrylate pressure sensitive adhesive by free radical copolymerization. The results show that the molecular weight of the polyacrylate pressure sensitive adhesive is 460,000, the initial viscosity is high and the stickiness is high. The initial viscosity test showed that the initial tack was achieved No.9, and the holding strength test showed that the holding strength was reached 90s. The peel strength test showed that the peel strength was reached 5.25N.3. Preparation of graphene polyacrylate pressure sensitive adhesive by high speed dispersion and high frequency ultrasonic dispersion method. It is found that the graphene has better dispersion in the acrylate resin, and the sedimentation and agglomeration does not occur in one week. Compared with the pure acrylic pressure sensitive adhesive, the addition of graphene can greatly improve the thermal conductivity and mechanical properties of graphene polyacrylate pressure sensitive adhesive.