About the current situation and future development

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Zhang Cheng: about the current situation and future development of graphene

Zhang Cheng: about the current situation and future development of graphene


--- forum platform/coating and protection magazine e Zhongmin

Zhang Cheng

chief scientist and doctoral tutor of Hangzhou cenchuang Technology Co., Ltd., deputy dean of School of chemical engineering, Zhejiang University of technology; Executive director of the national international scientific and technological cooperation base for energy materials and applications; Mainly engaged in the preparation and application of optoelectronic functional materials, nano materials, energy materials, damping materials and microwave absorbing materials; Presided over more than 20 national international cooperation projects, including 973 early-stage projects and national funds; Published 120 SCI papers; Applied for more than 110 international and Chinese invention patents; He won the contribution award of Chinese overseas Chinese (innovative achievements) and the first prize of science and technology of Zhejiang Province

coating and protection: what are the excellent properties of graphene? What are the representations

Zhang Cheng: graphene has excellent optical, electrical, mechanical, thermal, magnetic and chemical properties. It is widely used in the fields of energy storage, electronic devices, anti-corrosion coatings, biomaterials, sensing materials and catalyst carriers. It is considered a revolutionary material. The characterization of graphene is mainly divided into image class and spectrum class. The image class mainly includes optical microscope, transmission electron microscope (TEM), scanning electron microscope (SEM) and atomic force microanalysis (AFM), while the spectrum class mainly includes Raman spectrum (Raman), infrared spectrum (IR), X-ray photoelectron spectroscopy (XPS), ultraviolet spectrum (UV) and X-ray diffraction (XRD). Among them, TEM, SEM, R, especially the use of lithium manganate batteries in logistics vehicles. Aman, AFM and optical microscope are generally used to judge the size and number of layers of graphene

coating and protection: what are the main preparation methods for graphene? What are the limitations

Zhang Cheng: the existing methods for preparing by-product ammonium sulfate from graphene are the lowest among all caprolactam processes, including epitaxial growth method, chemical vapor deposition method, oxidation-reduction method, liquid phase stripping method, mechanical ball milling method, etc., of which the most common is oxidation-reduction method. Its advantage is that it can prepare graphene oxide and reduce graphene oxide on a large scale, and there are many functional groups on the surface of graphene oxide, Chemical grafting method can be used for modification, and its shortcomings are also very obvious. A large number of strong acids and strong oxidants need to be used in the preparation process, which destroys the original structure of graphene, makes the prepared graphene defective and causes serious environmental pollution. In terms of production technology in the current market, the possibility of pollution-free large-scale production of graphene is very low, and the balance between graphene quality and production cost cannot be taken into account

coating and protection: what is the level of Hangzhou centron technology in graphene preparation technology

Zhang Cheng: the development goal of Hangzhou sechuang Technology Co., Ltd. since its establishment is to produce high-quality graphene on a large scale without pollution. In june2017, the company set up a professional team and launched a technical breakthrough project. On the basis of the original physical preparation of graphene, through hard work, the company independently developed the preparation technology of graphene powder v2.0. Hangzhou Ceng graphene powder v2.0 has become one of the best graphene powder in the market. By the end of 2018, Hangzhou centron had completed the construction and testing of a pilot production line for the physical preparation of graphene, with an annual production capacity of more than 6 tons. In the future, we will continue to increase the R & D investment in the preparation technology of improved graphene powder. The R & D goal in 2019 is to realize the controllable layering of graphene and modify graphene powder for different application scenarios

coating and protection: graphene has a wide range of applications, but in view of the current technical factors, what are the main difficulties in its application

Zhang Cheng: if graphene is regarded as an additive, even if the additive quality is very low, the volume of graphene is likely to be larger than the parent material or the additive. In addition, graphene has a very large specific surface area, so it is easy to stack and agglomerate, and it is not easy to disperse uniformly with a lesson learned from the past. Therefore, how to prevent the uneven stacking and agglomeration of graphene sheets to obtain graphene powder with high uniformity and few layers has always been the most difficult technical problem to be solved in the industry

coating and protection: the emergence of an advanced material will certainly affect its related industrial ecology. At the same time, one of the accompanying problems is how to standardize. So, what progress has been made in the standardization of graphene materials

Zhang Cheng: at present, the development direction of graphene industry standardization at home and abroad mainly focuses on the following aspects: first, the basic standards of graphene materials, including terms and definitions of graphene materials, blank experimental specifications, etc; Second, the structure and performance standards of graphene materials, including the detection and performance evaluation methods for the number of layers, specific surface area, electrical properties and chemical properties of the materials; The third is the standardization of graphene material preparation methods, including epitaxial growth method, chemical vapor deposition (CVD) method and graphite oxide reduction method; 4. Relevant standards for graphene products, such as graphene powder material, graphene conductive film, graphene conductive film and graphene cooling film, whose demand in the Indian market is expected to exceed 4million tons; During this period, graphene electrode materials, graphene carrier materials, etc; In addition, in the future, the standardization of graphene application in the fields of composite materials, transparent electrodes, flexible devices, touch screens, detection and sensing, information technology, energy and environmental protection will also be the key development direction of China's material industry

coating and protection: as far as the coating industry is concerned, the research on the action mechanism of graphene in coatings is still basically within the framework of traditional thinking. How do you view the importance of mechanism research

Zhang Cheng: foreign countries have accumulated a lot of technical foundation and development experience in the action mechanism, system design, product preparation and engineering application of graphene anti-corrosion coating for marine corrosive environment. Although domestic related research started early, the performance, law and mechanism of graphene anti-corrosion in marine environment are still unclear. It is urgent to speed up the research on basic theory and application technology to narrow the gap with foreign advanced level

at present, the development trend of graphene coating mainly includes the following aspects: the innovation of graphene dispersion technology in the coating further improves the maximum addition amount, uniform dispersion and heat resistance of graphene in the aqueous resin system; Explore the composite method of graphene and resin and improve the performance evaluation system of graphene coating; In order to provide technical and theoretical support for the application of graphene in the field of anti-corrosion coatings, the anti-corrosion mechanism of graphene in coatings is deeply explored

coating and protection: we know that fluorocarbon coating is a high-performance coating in the anti-corrosion field, and graphene is the "king of new materials". From the perspective of formulation optimization design, how much do you think graphene can play in improving corrosion resistance

Zhang Cheng: graphene has excellent water and gas resistance characteristics. When applied to the field of corrosion protection, it can effectively block the path of corrosion factors penetrating the coating. Compared with traditional anti-corrosion materials, in addition to improving the anti-corrosion performance, the coating is light in weight due to the small proportion of the coating, and does not have any toxicity, providing a cost-effective advantage

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