Study On Surface Coating Of Energy-containing Materials Based On Microfluidic Technology

As energetic materials are widely used in military and civilian applications,it is more and more important to improve their safety during transportation,storage and use.The surface coating treatment of energetic materials can greatly reduce the sensitivity of energetic materials,increase the plasticity and improve the safety of energetic materials.The traditional surface coating method of energetic materials has some disadvantages,such as uneven particle size and discontinuous coating.However,microfluidic technology can prepare droplets with uniform particle size,which can realize the surface coating of energetic materials and make up for the shortcomings of traditional surface coating methods.Therefore,this paper will study the surface coating of energetic materials based on microfluidic technology.In this study,based on the droplet generation process and curing principle of three different coating methods: photocuring method,solution suspension method and ion exchange method,three kinds of microfluidic chips were designed and fabricated respectively,and the droplet generation,curing process and coating effect in the experimental process were analyzed.The main research contents are as follows:(1)Use the light curing method to coat the surface of energetic material substitute.PEGDA hydrogel material was used as the coating material instead of energetic material,and the curing principle of photocuring method was analyzed.A capillary glass tube microfluidic chip suitable for photocuring method was designed and fabricated.The influencing factors and rules of droplet formation were explored,and the particle size and uniformity of the collected PEGDA microspheres coated with energetic material substitutes were explored,and the surface structure and coating situation of the collected PEGDA microspheres coated with energetic material substitutes were analyzed.(2)The solution suspension method was used to coat the surface of the energetic material substitute.Using polymethyl methacrylate as coating material,the curing theory of solution suspension method was analyzed,and a capillary glass tube microfluidic chip was designed and prepared.The influence of the flow rate of continuous phase and dispersed phase on the size and shape of the droplet was explored.The particle size distribution of the collected polymethyl methacrylate microspheres coated with energetic material substitute was analyzed,and the shrinkage rate before and after curing was explored.The surface structure and coating situation of the collected polymethyl methacrylate microspheres coated with energetic material substitute were analyzed.(3)Ion exchange method was used to coat the surface of the energetic material substitute.Using calcium alginate hydrogel as the shell material and paraffin oil as the coating material,the capillary glass tube microfluidic chip suitable for solution suspension method was designed and prepared according to the curing theory of ion exchange method and the generation theory of double coated droplets.To explore the optimal flow channel surface modification method suitable for ion exchange method,analyze the influencing factors of the wall thickness and droplet morphology of double-coated liquid droplets,and analyze the surface structure of the collected calcium alginate double-coated microspheres coated with energetic material substitutes.