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Why is plasma power also used for surface treatment of powder
Why is plasma power also used for surface treatment of powder: The surface treatment of the powder material using plasma power can enable the surface of the powder to achieve the effects of etching, activation, impurity removal, grafting, crosslinking, and coating, thereby changing its structure and chemical composition. There are mainly two types of powder materials: organic powder and inorganic powder. Now Chengfeng Zhizao will introduce the role of plasma power in the surface treatment of organic powder. The surface treatment of organic powder materials is usually based on inhibition to make the organic powder more dispersed and more compatible in the polymer. Therefore, the composite material formed by it and polymer has good performance in terms of force, light, electricity and so on. When the plasma power source performs surface treatment on organic powders, polymer monomers and initiating gas mixed discharge are generally used. In this method, the discharge initiates the gas to generate active particles, and can initiate the grafting of polymerized monomers to the powder surface to form a modified coating layer. In addition to processing ordinary oxide organic powders, it can also process certain materials such as carbon fiber, activated carbon, and carbon nanotubes. Oxygen plasma is used to process the nano-carbon fiber material, and the mechanical properties of the treated carbon fiber and polypropylene are much better than that of the untreated one. In addition, under normal circumstances, after the carbon nanotubes are treated with a plasma power source, the dispersion and compatibility of the composite material can be significantly improved. Chengfeng Zhizao focuses on the research and development of plasma cleaners. If you want to know more product details or have questions about the use of the equipment, please click "Online Customer Service", and look forward to your call!
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How does the alternating electric field of the plasma cleaner affect the discharge and surface treatment effects
How does the alternating electric field of the plasma cleaner affect the discharge and surface treatment effects: In the process of changing the electric field generated by the plasma cleaning machine, the frequency of the electric field and the electrode spacing have an important influence on the plasma discharge phenomenon and affect the effect of plasma surface treatment. What is the relationship between the two, in order to avoid the electric field The effect of frequency on the discharge of the plasma cleaning machine, within a quarter of a cycle, the charged particles between the electrodes can reach the electrodes completely, thereby avoiding the generation of charges in the gap; therefore, when the gap is given, the The frequency of the alternating electric field at the fixed gap should be limited, otherwise the discharge process will be affected by the charge in the gap. First, consider the movement of positive ions between the plates, and then the corresponding distance and frequency between the electrodes can be calculated. Based on the influence of space charge, it can be divided into three situations: when there is no space charge accumulation, the breakdown conditions are similar to static charge; when part of the space charge exists, the breakdown voltage is slightly lower than the static charge; when the space charge increases, the ion space charge It will oscillate between the poles, and the breakdown voltage is lower than the static charge. For an atmospheric piezoelectric field with a distance between electrodes of 1 cm, the relationship between the alternating electric field breakdown voltage of the plasma cleaner and the electrostatic breakdown electric field frequency is very complicated. Under the condition of an alternating magnetic field, the relationship between the breakdown voltage and the air pressure of the plasma cleaner is also different from that of static electricity. Now, the method of generating plasma by alternating electric field has been widely used in industrial applications and research fields. For example, intermediate frequency power supply, low-pressure radio frequency power supply and microwave source for low-temperature plasma discharge. Chengfeng Zhizao has focused on the research and development of plasma cleaning machine technology for 20 years. If you want to know more product details or have questions about the use of the equipment, Chengfeng Zhizao is looking forward to your call!
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Research on enhancing the hydrophobicity of epoxy surface by plasma treatment with jet low temperature plasma power supply
Research on enhancing the hydrophobicity of epoxy surface by plasma treatment with jet low temperature plasma power supply: The surface condition of insulating materials is one of the important factors that determine the size, performance and stability of power equipment. Insulating materials in a high-voltage electric field are prone to flashover discharge along the surface, and the flashover voltage is much lower than the breakdown voltage. How to increase the surface flashover voltage of insulating materials and effectively suppress the occurrence of flashover is a problem that has been working hard to solve. Improving the surface hydrophobicity of insulating materials is an effective way to increase wet flashover and pollution flashover voltage. At present, measures such as silicone oil, silicone grease (RTV), silicone rubber coating and nano-material filling are mainly used to improve the hydrophobicity of the insulating material surface, but these measures have poor coating adhesion, poor uniformity, poor timeliness, and high maintenance costs. shortcoming. Therefore, on the basis of not affecting the insulation performance of the substrate, forming a uniform, dense and long-lasting hydrophobic layer on the surface by new means can effectively overcome these shortcomings and better improve the surface performance of the insulating material. Plasma treatment with jet low-temperature plasma power supply is one of the new methods to change the surface properties of materials, and it has received extensive attention in recent years. The plasma surface modification of the low-temperature plasma power supply is a dry process, which is highly energy-efficient and pollution-free. The modification only involves the surface nanometer range, and the performance of the matrix is ​​not affected. Among the many discharge forms that generate atmospheric pressure low-temperature plasma, the plasma jet developed in recent years is an ideal plasma source for surface treatment of materials. This discharge form separates the discharge generation from the treatment area through the airflow, and has greater processing flexibility. And controllability, it is very suitable for processing large-size and complex-shaped insulating material surfaces. However, the current research on using jet low-temperature plasma power to improve the water repellency is mainly for typical polymer and metal surfaces, and less involved on the surface of insulating materials. The reason for the increase in water repellency caused by the jet low-temperature plasma power source is that with the increase of processing time, the surface energy dispersion component increases slightly, while the polar component decreases sharply with the increase of processing time. Caused by the reduction of the polarity component. The surface of the untreated epoxy has no obvious features, and the surface is relatively rough. The treated epoxy surface showed a specific morphology, and a uniformly distributed dense network structure was formed on the surface, indicating that the jet low-temperature plasma power plasma treatment formed a new material with a fixed morphology structure on the surface. The jet low-temperature plasma power plasma treatment can effectively improve the hydrophobicity of the epoxy surface. As the treatment time increases, the water contact angle of the epoxy surface increases and the surface energy decreases after treatment. The particles of Ar, OH, O and Si contained in the jet interact with the epoxy surface to form a dense network structure on the surface. At the same time, silicon-containing groups are introduced on the surface to effectively reduce the surface polarity and make the epoxy The hydrophobicity of the surface is improved.
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What is the impedance matching principle of the online plasma cleaning machine, and what are the knowledge points
What is the impedance matching principle of the online plasma cleaning machine, and what are the knowledge points: The impedance adapter seems to be a bridge connecting the reaction chamber, electrode and plasma generator of the online plasma cleaner. Therefore, how does the impedance matching of the online plasma cleaner work? How does it work? Impedance matching is usually used in vacuum online plasma cleaning equipment. The reaction chamber, electrode, plasma generator, etc. are called loads. In a DC circuit with a load, the load resistance is equal to the internal resistance of the power supply as a necessary condition for load matching. This Z high-power DC loop theorem also exists in the corresponding AC loop. Let me explain to you what the next high-frequency circuit with load impedance z looks like. Set the internal impedance of the power supply, that is, the output impedance to (a+jb)Ω. In order to meet the output requirements of the Z high-power load, the load impedance needs to be "matched" with the output impedance of the high-frequency generator. Conjugate matching can make the total impedance become a pure resistance, that is, the load impedance Z must be (a-jb)Ω at this time. In the design of the online plasma cleaner, in order to control the high-frequency current in the loop within a reasonable value range, the output impedance of the high-frequency generator is usually designed as a pure resistance, generally 50Ω. In general, the high-frequency discharge impedance is the capacitive impedance. Due to the changes in the discharge conditions of the reaction chamber in the online plasma cleaner, the high-frequency discharge impedance will change in value. Therefore, it is necessary to adjust the impedance of the matching network and the discharge impedance to achieve Simulate the addition of load impedance to make it consistent with the output impedance of the high-frequency generator to achieve matching. In other words, the matching network must be adjusted through various discharge conditions so that the analog load is also equal to 50Ω. In addition, in order to avoid unnecessary power loss in the matching network due to heat, the location of the matching network is also carefully set. This is one of the factors that affect the matching effect of the online plasma cleaning machine. In future articles, Chengfeng Zhizao will again Talk to everyone. If you have any questions, please click on the online customer service for consultation, Chengfeng Zhizao is waiting for your call!
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The market for light-emitting diode LED production equipment is shrinking, and how does plasma equipment develop
The market for light-emitting diode LED production equipment is shrinking, and how does plasma equipment develop: I accidentally saw a piece of news on Baidu before. The general content is that it is expected that by 2018 (now 2021), 50% of the lamp holders will support LED, and the market More than 80% of the lamps will be light-emitting diode LED lights. And the LED production equipment used in all LED manufacturers is far from what it was two years ago. At present, the investment in the LED industry is already a very large-scale investment. From this point of view, the prospects of the LED market need to be considered by the industry. Under such great pressure, how to develop LED auxiliary processing equipment such as plasma equipment? Leading the LED industry? Let’s take a look at the problems encountered in the LED production process. In the production process, LED packaging often encounters problems such as gold wire and die bonding. When this kind of problem occurs, many methods may not have any effect, so at this time, products such as our plasma equipment can be used for auxiliary treatment. Its advantage lies in the characteristics of surface cleaning, surface modification, and product performance improvement. Then, after products such as LED use plasma equipment, many problems encountered in packaging will be improved. Therefore, Shenzhen Chengfeng Zhizhi plasma equipment professional manufacturer fully recommends the application of light-emitting diodes to the production of LEDs. , I believe it will bring good news to the LED industry. Now, with the influence of domestic plasma equipment in China and the world, it is believed that these problems encountered in the packaging process can be solved. In addition to the promising development of the light-emitting diode LED industry, plasma equipment is also very much needed in other industries, such as: rubber and plastics industry, automotive industry, electronics industry, defense industry, defense industry such as aerospace electrical connectors and cave Pull processing, in addition to the medical industry and textile fiber industry and so on. Plasma technology is now very common in domestic applications, and its related output value is increasing year by year. The output value of the foreign market is higher than that of the domestic market, but the domestic development space is large and the prospects are attractive.
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Application of plasma technology of low temperature plasma surface treatment machine in textile printing and dyeing
Application of plasma technology of low temperature plasma surface treatment machine in textile printing and dyeing: The principle of low-temperature plasma surface treatment machine plasma treatment of fabrics is to perform low-pressure glow discharge in a high-frequency oscillating power magnetic field inductive coupling mode, ionization generates low-temperature plasma, and the fabric is sealed in the electric field. A large amount of plasma generated in the electric field and High-energy free electrons can promote corrosion, exchange, grafting and copolymerization of the thin layer on the fiber surface. This process can achieve chemical and physical modification effects that cannot be achieved by chemical reactions without plasma participation. The low-temperature plasma surface treatment mechanism can break the macromolecular chains of the fiber surface layer and present a microscopic rough and uneven state, creating conditions for further modification, or generating ions or free radical groups on the surface to change the performance of the fiber. The mode of action of the low-temperature plasma surface treatment machine on textile materials: gas-discharge→plasma→act on polymer materials 1. Free radicals are generated on the surface of the material 2. Introduce specific groups on the surface of the material 3. A cross-linked structure is formed on the surface of the material 4. The surface of the material is etched 5. Polymer deposits on the surface of the material 6. Grafting the surface of the material The use of low-temperature plasma surface treatment machine low-temperature plasma technology for pretreatment is a dry process of oxidative decomposition, that is, oxygen plasma is used to act on organic molecules such as slurry, grease, wax, etc., to decompose the organic matter into CO2, H2O and run away. Water, energy saving and pollution-free. The use of oxygen low-temperature plasma treatment of cotton grey cloth makes it possible to change the pre-treatment from three steps to one step. After the grey fabric is treated with oxygen low-temperature plasma, the slurry on the surface of the warp yarns, the wax and pectin in the corneal layer on the surface of the cotton fiber are oxidized by the action of the low-temperature oxygen plasma, and oxygen-containing hydrophilic groups and macromolecules are introduced. The chain is cut, thereby increasing the water solubility. After the cotton grey fabric is treated with oxygen low-temperature plasma, it can be directly bleached with hydrogen peroxide without desizing and refining, and its effect is no less than that of cotton fabrics treated by conventional processes. In addition, after oxygen low-temperature plasma treatment, the cotton grey fabric eliminates the need for concentrated alkali and high-temperature desizing and refining processes, so that protein fibers and polyester fibers blended or interwoven with cotton are protected from damage. It shows that the low-temperature plasma treatment of the low-temperature plasma surface treatment machine can greatly promote the pretreatment of ramie fabric. Greatly improve the desizing and capillary effect. The ramie fabric treated with oxygen low-temperature plasma is not only etched on the surface, and the moisture absorption is improved, but also the electronegativity of the fiber surface and the crystallinity of the fiber also change, which will initiate the graft polymerization of acrylamide to improve the dyeing performance of the ramie fabric, thereby increasing The dye uptake rate and deep dyeing property are increased, and at the same time, it is beneficial to improve the level dyeing property and balance the dye uptake rate. Plasma treatment after dyeing has a greater impact on the deep dyeability of ramie fabrics than plasma treatment before dyeing, and plasma treatment after resin or softener finishing will improve the deep dyeability more significantly. Low-temperature plasma surface treatment machine plasma treatment is beneficial to improve the color fastness of direct dye-dyed ramie fabrics, especially the combined treatment of resin finishing and oxygen low-temperature plasma, the dyeing fastness is improved even more, and it can replace the fixing agent Y fixing treatment. Plasma initiates cross-linking, oxidation, degradation and other reactions on the surface of the fiber to change the molecular chain structure of the surface layer. Some groups that bind to the dye can also be generated to form a dye seat, thereby increasing the dye uptake rate. The improvement of fiber dyeing performance by low-temperature plasma is often the combined result of these effects.
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