Research Of Key Technology For Surface Modification Of Textile Material By Atmospheric Pressure Glow Discharge Liquid Deposition

With social progress and development of science and technology, the gas discharge plasma technology is playing an increasingly important role in material, microelectronics, chemical, mechanical, environmental protection and many other fields. However, the operating system contains many problems such as process complexity, difficult to achieve continuous production, equipment of higher cost etc. in practical use of discharge plasma under vacuum. Therefore, atmospheric pressure glow discharge plasma technology has gradually become the research hotspot. Although atmospheric pressure glow discharge possesses high electron energy levels, no vacuum system, some key issues still need to be further studied in practice. For example, atmospheric pressure glow discharge liquid deposition (APGDLD) process system, microscopic mechanism of thin film deposition process, plasma discharge power parameters association with the modified material and so on. On the basis of the investigation of relevant research at home and abroad, this dissertation presented the subject "key technology research on surface modification of textile material by atmospheric pressure glow discharge liquid deposition".The dissertation is divided into seven chapters, specific contents are as follows:Chapter 1, Introduction. This chapter has presented and discussed the subject source, research purpose and significance, research at home and abroad, key technologies and the main study in this dissertation.Chapter 2, Research on process of atmospheric pressure glow discharge liquid deposition. Aimed at how to improve the efficiency of liquid deposition process, atmospheric pressure glow discharge liquid deposition system was developed, through its mechanism research, the micro- kinetic model of thin film deposition process of the surface modification of materials was built.Chapter 3, Research on voltage type PWM rectifier of plasma liquid deposition. Aimed at the problems such as the low power factor of atmospheric pressure glow discharge in the power grid side, serious harmonic pollution, instable DC side voltage and poor dynamic response capacity, for setting the given system power and curbing the current fluctuations, through the research on three-phase VSR control system involved in the PWM rectifier topology and principle, control strategy of PWM rectifier, model conversion from three-phase static coordinate system to two-phase rotating coordinate system, based on the analysis of flow converter approach of input voltage and current of space vector three-phase VSR, modulation of three-phase VSR, a new three-phase VSR was designed.Chapter 4, Research on voltage type PWM inverter of plasma liquid deposition. From the equivalent circuit of dielectric barrier discharge, series resonant power topology was chosen for high-frequency discharge power supply of atmospheric pressure glow discharge, through analysis of its work modal, a voltage-type series resonant inverter ZVS control was designed; a dynamic soft-switching dead-time control method was adopted to solve the problem of delay time of power tube. Wear and tear of power switching tube and the higher surge voltage/current decreased; through research on the PS-PWM circuit, Through detection of DC voltage of the mid-point in the inverter bridge arm and amplitude of transformer primary current, one-way voltage will be converted. Anti-bias attained by means of superposition synthesis of amplitude and PWM phase-shifted angle fine-tuning.Chapter 5, Experimental study on plasma power. In order to verify the theoretical study, a prototype of digital control of plasma power was designed. Through experiments the relevant parameters were optimized, the optimized plasma power can control the trigger pulse change dynamically and automatically with the change of the load current, DC voltage and the resonant frequency at ZVS control, so that the converter of switching components can maintain conversion at zero-voltage. That is, it proves that the control method is feasible and efficient.Chapter 6, Research of APGDLD on surface modification of textile material. In order to verify the simulation study, through experiment study on process system parameters of APGDLD on surface modification of textile material, the effect of discharge power, frequency, treatment time, monomer flow rate, He flow rate on the film deposition rate and the contact angle etc. were explored. Coating of different monomer film was deposited successfully on PE fibers, silk fabrics, cotton fabrics respectively. Application of this technology can acquire adhesion and washable and high-performance deposition coating on the substrate surface. Through the experimental research, APGDLD system shows simple device, low power consumption and fast film-forming characteristics.Chapter 7, Conclusion. The main research and innovation were concluded, the topic for surface modification technology of atmospheric pressure glow discharge liquid deposition treatment of textile material, the theoretical and experimental research laid the theoretical and experimental foundation for the practical application of technology. The future research work also has a prospect.