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Study the working environment of plasma to improve the hydrophilicity of PITFE material surface

Study the working environment of plasma to improve the hydrophilicity of PITFE material surface

Study the working environment of plasma to improve the hydrophilicity of PITFE material surface: Polytetrafluoroethylene (PIFE) has been widely used in industrial applications because of its unique properties such as excellent chemical stability, dielectric properties, extremely low coefficient of kinetic friction, good machinability and flame retardancy. Separator paper is also called polyethylene (PE) film. Its function in lithium-ion batteries is to isolate the positive and negative materials. The quality of the separator paper directly affects the safety performance and capacity of the battery. Therefore, the selection of high-quality separator paper has been It is the only way for battery manufacturers. Biocompatible silicone rubber and polyester as a new thermoplastic engineering plastic have a wide range of uses, but due to the poor surface wettability of such polymer materials, their application in some special industrial technology fields such as medical treatment and hygiene is limited. application. Most of the surfaces of new polymer materials are hydrophobic, which limits their applications in bonding and other aspects. Plasma surface modification is to optimize the structure and properties of the material surface by plasma, and it is a very forward-looking material surface modification method. The methods of surface activation mainly include chemical etching method, optical radiation method, plasma treatment method, ion implantation method, surface graft polymerization method, etc. Plasma surface modification is to optimize the structure of the material surface by discharging plasma. Because of its specific environment, cost and other advantages, it has become a commonly used material surface modification method in the industry. PIFE, PE, silicone rubber polyester, banner samples, all can be processed by continuous drive plasma. When the power is the same, the modification effect of plasma is Ar+H, N2, O2 in descending order. The increase of power is not conducive to the improvement of the hydrophilicity of the PIFE sample surface. This is because the high-energy particles in the plasma increase significantly under high power, which strengthens the impact on the surface of the material and makes some active groups on the surface inactive. , thereby reducing the introduction of reactive groups. When the discharge voltage is greater than 10Pa and less than 50Pa, the pressure has no obvious effect on the contact angle. However, when the air pressure is greater than 50Pa, the contact angle increases instead, which may be due to the high air pressure that makes it difficult for the gas to be completely ionized, thus affecting the modification of the PTFE surface. Plasma endows the material with new surface properties, but the effect of plasma surface treatment has a problem of timeliness. It shows a certain change with the placement time. With the extension of time, the surface contact angle will gradually increase. The reasons for the aging wettability decay of plasma treated but not grafted may be multi-faceted, which may be caused by the newly introduced hydrophilic groups sneaking into the surface of the material after being placed for a period of time; it may also be caused by surface generation. The cross-linking chemical reaction reduces the hydrophilicity of the material surface. Therefore, in order to prevent the failure of the plasma-treated surface, grafting, bonding and other treatments must be carried out within a specified time to maintain and make full use of its modification effect. Plasma contains a large number of active particles such as electrons, ions, excited atoms, molecules and free radicals. These active particles interact with polymer materials to cause various physical phenomena such as oxidation, reduction, cracking, cross-linking and polymerization on the surface of the material. And chemical reaction, so as to optimize the surface properties of the material, increase the surface hygroscopicity (or hydrophobicity), dyeability, adhesion, antistatic and biocompatibility. Plasma realizes the surface modification of polymer materials PTFE, PE battery separator, silicone rubber and polyester. Plasma working conditions have a significant effect on improving the hydrophilicity of PITFE material surfaces. After plasma treatment, a large number of polar groups are introduced on the surface of the material, which is the reason for improving its hydrophilicity.

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The principle of using the major functional characteristics of plasma in different industries

The principle of using the major functional characteristics of plasma in different industries

The principle of using the major functional characteristics of plasma in different industries Low-temperature plasma + photocatalysis technology refers to filling the plasma reactor with TiO2 catalyst. When the high-energy particles generated by the reactor decompose organic pollutants into small molecules, these substances are further oxidized and decomposed into inorganic molecules under the action of the catalyst. Small molecules to achieve the purpose of purifying and separating waste gas. The photocatalyst and the plasma discharge are interrelated. The catalyst can change the properties of the plasma discharge, so that the discharge can produce new active substances with stronger oxidizing power; while the plasma discharge will affect the chemical composition, specific surface area and catalytic performance of the catalyst. structure, improve its catalytic activity, and greatly improve the efficiency of low-temperature plasma + photocatalytic technology to purify VOCs. The combined technology is more suitable for treating organic waste gas with large air volume and low concentration, and has the advantages of low operating cost, fast reaction rate, and no secondary pollution. Plasma surface modification uses the high-energy active particles in the plasma to bombard the surface of the material, giving the surface new properties. Since it only acts on the surface, the original bulk properties of the material remain unchanged. It should be pointed out that plasma has no requirements on the base material, and can be used for surface modification of metal materials as well as insulating materials. Plasma cleaning is the process of cleaning a product to improve its ability to print or bond. The purpose of plasma cleaning is to remove organic surface contaminants. Plasma treats the surface of your product to accept printed adhesives or inks. Usually on Teflon or plastic, plasma surface modification actually changes the surface of the material, leaving free radicals and making it stick to the glue or ink When the plasma interacts with the surface of the object to be cleaned, on the one hand, the plasma or plasma-activated chemically active substances are used to chemically react with the contaminants on the surface of the material, such as the oxidation reaction between the active oxygen in the plasma and the organic matter on the surface of the material. . The plasma interacts with the organic dirt on the surface of the material, and decomposes the organic dirt into carbon dioxide, water, etc. for discharge. When using plasma to modify or clean materials, low-temperature plasma is usually used, and the gas temperature does not exceed 100°, which is macroscopically speaking; but microscopically speaking, when the plasma and the material surface occur, During chemical or physical reactions, if the energy is concentrated in a local area, once the material is processed for too long, it may cause damage to the surface of some materials. Plasma etching technology for fiber structure analysis is the earliest application of plasma treatment in the textile industry and has become a mature technology. Another application is the modification of textile materials, using plasma to modify the surface of textile materials. , graft polymerization and plasma polymerization deposition, etc., to change the surface hydrophilic (hydrophobic) of textile materials, increase adhesion, and improve printing and dyeing properties.

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The modification of fiber surface by plasma technology has also received extensive attention

The modification of fiber surface by plasma technology has also received extensive attention

The modification of fiber surface by plasma technology has also received extensive attention Since the 21st century, with the rapid development of science and technology and modern industry, in order to meet the development needs of various industries, new materials with various functions have emerged one after another. At the same time, this has also prompted the development and progress of various surface modification technologies. Plasma surface modification refers to exposing the material to non-polymer gas plasma, and bombarding the surface of the material with the plasma to change the surface structure of the material, thereby realizing activation modification. In general, the surface modification of the functional layer is very thin (several nanometers to hundreds of nanometers), which will not affect the overall performance of the material; after modification, the surface of the material can be hydrophilic, anti-wear, decorative, coloring properties, printing, adhesion, antistatic and other functions. The modification of fiber surface by plasma technology has also received extensive attention. Plasma treatment of the carbon fiber surface can not only improve the adhesion, but also ensure that the tensile strength of the fiber does not decrease. In addition, plasma treatment can also eliminate surface microcracks of carbon fibers, reduce stress concentration, and improve the tensile strength of the fibers themselves. Plasma treatment of Kevlar fiber and aramid fiber has the same effect. PET fiber is widely used, but its dyeing, hygroscopic and antifouling properties are poor. After plasma treatment, polar groups are introduced on the surface to generate free radicals and cross-linked layers, which effectively improve various properties. During the production process of industrial components such as electronic components and auto parts, various contaminants will form on the surface due to cross-contamination, natural oxidation, flux, etc. quality, reducing the reliability and yield of finished products. Plasma treatment processes the surface of the workpiece through chemical or physical action, and the reactive gas is ionized to generate highly reactive reactive ions, which chemically react with surface contaminants for cleaning. The reaction gas needs to be selected according to the chemical composition of the contaminant. The plasma cleaning based on chemical reaction is fast, has good selectivity, and has better cleaning effect on organic pollutants. Argon gas is commonly used for plasma cleaning in which the surface reaction is mainly based on physical action, which does not produce oxidation by-products, and the etching effect is anisotropic. In general, in the process of plasma surface modification, chemical reaction and physical action coexist, so as to obtain better selectivity, uniformity and directionality. Due to the development direction of precision and miniaturization in the industrial field, plasma surface modification technology will have more and more important applications in the semiconductor industry, chip industry, aerospace and other high-tech industries due to its advantages of fine cleaning and non-destructive modification. value.

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Low temperature plasma technology solves environmental engineering sewage using three method

Low temperature plasma technology solves environmental engineering sewage using three method

The use of low-temperature plasma technology to treat environmental engineering sewage can achieve better treatment results under the combined action of high-energy electron radiation, ozone oxidation, ultraviolet light decomposition and other methods. The role of high-energy electrons: Low-temperature plasma technology generates a large number of high-energy electrons in the process of sewage treatment. Through collision with atoms and molecules in the wastewater, the energy is converted into the internal energy of the matrix molecules, and the wastewater is activated through multiple processes such as excitation, decomposition, and ionization. The new compounds are formed by breaking down molecular bonds in wastewater and reacting with reactive factors such as free oxygen and ozone. Finally, Z finally converts toxic substances into non-toxic substances and degrades pollutants in raw sewage. Ozone oxidation: In the process of sewage treatment, ozone acts as a strong oxidant to combine harmful substances to form some intermediate products, which reduces the toxicity of the raw sewage and the content of harmful substances. After several reflections, the organic substances of the polluted substances are finally decomposed into carbon dioxide. and water. For inorganic substances, certain oxides can be formed for removal; UV light decomposition: Using low-temperature plasma technology, UV irradiation can decompose harmful substances alone or in combination with ozone. The separation and decomposition is mainly that harmful molecular substances enter the excited state by absorbing photons, break the molecular bonds of molecules by absorbing energy, and then react with free substances in water to generate new compounds and release. The oxidation of ultraviolet rays and ozone can treat refractory substances at the same time, and the effect is better. Refractory organics and pesticides are quickly decomposed.

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Analyze the reasons why the plasma cleaning machine technology is so popular in the mobile phone LED industry:

Analyze the reasons why the plasma cleaning machine technology is so popular in the mobile phone LED industry:

As a new method for surface modification of materials, plasma scrubbers have attracted much attention due to their advantages of low energy consumption, low pollution, short treatment time, and remarkable effects. Among many modification methods, low temperature plasma cleaning is a method that has developed rapidly in recent years. Compared with other methods, plasma cleaning has many advantages: First, plasma cleaning is a drying process, which is different from the elimination of wet chemical treatment, wastewater treatment, etc. Compared with other drying processes such as radiation, electron beam, corona, etc., which are indispensable drying processes, the uniqueness of plasma cleaning machines is that the effect on the material only occurs in the range of tens of thousands of angstroms on its surface, and at the same time The surface properties of a material can be changed without changing its bulk properties. Ultra-low temperature plasma scrubbers are widely used in mobile phones, automobiles, electronic circuit boards and other production fields. Due to the ionization, recombination, excitation and migration of atoms in the plasma, ultraviolet rays are generated, and the photon energy is also in the range of 2~4eV. Obviously, in plasma, the energy provided by particles and photons is very high. In fact, the main function of the plasma scrubber is not to clean, but to modify the surface of the material. By treating the surface of the material, the bonding ability of the material can be improved, and the problems of bonding, painting, printing and dyeing can be solved. The actual cleaning is to use ultrasonic washing and drying. The plasmaization process is usually followed by ultrasonic cleaning, where the surface of the material is ultrasonically cleaned, then modified by plasma surface treatment, and then bonded or coated. There are many industries in which plasma cleaning machines are used, and customers often take all kinds of wonderful samples to deal with, such as various small toy accessories, cloth

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plasma cleaning machine-surface treatment equipment-CRF plasma machine-Sing Fung Intelligent Manufacturing

plasma cleaning machine-surface treatment equipment-CRF plasma machine-Sing Fung Intelligent Manufacturing

According to the temperature of heavy particles in plasma, plasma can be divided into two categories, hot plasma and cold plasma. At 3×103K-3×104K, the thermodynamic equilibrium is basically reached, with a uniform thermodynamic equilibrium temperature, and the plasma state and the plasma state can be determined by Maxwell's thermodynamic equilibrium velocity distribution, Boltzmann particle energy distribution, Shaha equation and other methods. parameter. Thermal plasma has high energy density and is mainly used for material synthesis, spheroidization, densification and coating protection. In low temperature plasma, the temperature of heavy particles is only room temperature, while the temperature of electrons can reach thousands of degrees, so it is far away from the thermodynamic equilibrium state, such as glow discharge belongs to low temperature plasma. Cold plasma is mainly used for plasma etching, deposition and plasma surface decoration. The temperature of electric washing is a concern of many users. During electric washing, the flame of electric washing looks similar to the general flame. However, if the electric washing equipment adopts an intermediate frequency power supply, it has high power and strong energy, and the temperature without water cooling is also very high. If the washing material is not temperature resistant, pay attention to the temperature. The power supply of the plasma cleaning machine is commonly used 13.56KHz radio frequency power supply, which produces high plasma density, soft energy, and low temperature. , the intermediate frequency power is 40KHz, contrary to the radio frequency power supply, the plasma density is not high, but the power is large, the energy is high, and the high power is tens of KW. The temperature of the vacuum plasma cleaner discharge RF cleaner is similar to the usual indoor temperature. Of course, if the vacuum plasma cleaner is used all day, it still needs to add water to the cooling system. The average temperature of the plasma jet is between 200 and 250 degrees Celsius. If the distance and speed can be set correctly, the surface temperature can reach 70-80℃. This process is suitable for cleaning various standard products (metals, ceramics, glass, plastics, elastomers, etc.). Generally, a jet plasma cleaning device is used, and it can also be applied to a plasma cleaning device on an assembly line. Due to the continuous operation of the assembly line , the material stays under the nozzle for a long time. Nitrogen can also be used for some jet plasma cleaning due to its ability to lower the plasma temperature. It should be noted that there is another product in the plasma cleaning machine called corona. In fact, corona is also a classification of plasma cleaning machines. The washing temperature of the corona machine is generally higher, and the washing temperature of the corona machine is similar to that of the jet plasma. Sometimes materials that are not resistant to high temperature are also cleaned with nitrogen. In fact, there is no need to worry too much about temperature. The current plasma cleaning machine can adjust the temperature well, so that the material cleaning can achieve the desired effect

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