Graphene is an emerging material discovered in recent years. Due to its unique and stable structure, it has many excellent properties such as electrical conductivity, thermal conductivity and hardness. This is a two-dimensional honeycomb carbon material composed of carbon atoms arranged in a hexagonal shape. In recent years, researchers have been constantly studying how to add graphene as a reinforcement to a matrix material. Ultimately improve the performance of the matrix material. The hydrophobicity and chemical inertness of graphene are relatively low compared to graphene oxide. The phenomenon of agglomeration of graphene in the matrix has also attracted more and more attention from researchers. Various methods have been tried to overcome the problem of graphene agglomeration. The performance of graphene depends largely on its degree of dispersion. Therefore, the quality of graphene dispersion equipment has a great influence on the properties of graphene.
Graphene has a large lateral surface area and tends to be agglomerated together. This not only reduces its own adsorption capacity but also affects the performance of graphene itself. This affects the improvement of the performance of graphene reinforced composites. Moreover, such agglomeration is irreversible unless it is uniformly dispersed by applying an external force such as ultrasonication and vigorous stirring. In order to obtain graphene reinforced composites with excellent performance, researchers have done some research in overcoming graphene agglomeration.
The method for uniformly dispersing graphene in a matrix mainly includes two types of physical dispersion and chemical dispersion.
Here we mainly introduce the in-situ polymerization method
The in-situ polymerization method is to first uniformly disperse the nanoparticles in the monomer, and then initiate polymerization by using an initiator. The nanoparticles or molecules are uniformly dispersed on the polymer matrix and form an in situ molecular polymeric material. In-situ heterogeneous polymerization not only maintains the nano-characteristics of the particles, but also achieves uniform dispersion of the filled particles.This makes it possible to form nano-shaped particles having a core-shell structure with an elastic coating layer. Since the outer layer is an organic polymer, it can increase the affinity of the material to the organic phase. Graphene is relatively uniformly dispersed in the polypropylene matrix, especially when the graphene content is high, the dispersion is more uniform. This in-situ polymerization method is indeed advantageous for achieving uniform dispersion of graphene in a polypropylene matrix.
In situ polymerization also has its limitations. It is the inorganic nanomaterials that must have good compatibility with the materials selected. In order to find a suitable solvent to dissolve both raw materials and inorganic materials, it will inevitably increase research time and cost, and also cause environmental pollution. In addition, the addition of graphene increases the viscosity of the polymer, making the polymerization more complicated. It is understood that researchers try other methods that have complex processes and high costs. Then you need to find a relatively simple way to reduce costs.
Method for preparing graphene slurry
ZJR series high-speed dispersion homogenizer developed by Wuxi Yikai. The equipment uses ultra-high speed dispersion shear designed by German technology. It can be realized that “the particle size of the agglomerate is first opened, the original particle size of the material is reduced, and the material is further refined and peeled off”. The ideal graphene slurry can be obtained efficiently! Welcome to the factory test machine experience!