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Surface treatment of carbon fiber plasma improves hydrophilicity
As an important fiber material, carbon fiber has high specific strength, high specific modulus, high temperature resistance, corrosion resistance and other excellent properties. It has been widely used in national defense and military industry, aerospace, weapons and equipment, transportation, biomedicine and other high-tech industries. But, as a result of carbon fiber is made of flake graphite crystallite organic fiber, such as along the fiber axial inclination of microcrystalline ink material, its surface is highly crystallization and non-polarity flake graphite layer structure, chemical inertness, lead to their table interface performance is poorer, the serious influence subsequent comprehensive performance of composite materials, is limited under the specific conditions of application, plasma surface treatment technology can improve the problem. At present, surface modification of carbon fiber has become an indispensable part in the process of carbon fiber production. Manufacturers such as Toray of Japan, Mitsubishi Rayon of Japan and Siguri of Germany have used surface modification as an important indicator of carbon fibre quality. Therefore, surface modification of carbon fiber to improve its surface hydrophilic properties is the key to the production and application of carbon fiber. In the past few years, a great deal of research has been done on the surface modification of carbon fiber. Among these factors, improving the surface roughness and increasing the surface chemical functional groups are the keys to improve the surface interface properties of carbon fiber. The common methods of surface modification of carbon fiber include surface oxidation, surface coating, high-energy ray irradiation, supercritical fluid surface grafting and plasma surface modification. The electrochemical oxidation process has the characteristics of strong continuity of production and easy control of process conditions, which has been applied in industry. But it still USES a lot of chemicals, consumes a lot of energy, produces a lot of waste water and liquid, and is difficult to oxidize for high-modulus carbon fiber, requiring extended treatment time. Compared with the traditional plasma surface modification technology, it is the most widely used method with the advantages of clean environment protection, time saving and high efficiency. The working principle of plasma surface treatment mainly includes two aspects: on the one hand, free radicals and polar groups are formed on the fiber surface through active particles, so as to improve the free energy and wettability of the fiber surface; On the other hand, the surface area and surface roughness of the fiber are increased by etching to remove pollutants from the fiber surface. The surface modification of carbon fiber in aqueous solution was carried out by surface treatment of atmospheric plasma cleaning machine, and the hydrophilic modification of carbon fiber surface slurry was carried out at the same time by using the interaction between active particles and water molecules in plasma.
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Lithium battery plasma cleaning machine processing process
At present, lithium batteries are mainly used in electronic and digital products, including tablet computers, laptops, mobile phones, digital cameras and other products. Plasma cleaning machine plays a vital role in the manufacture of lithium batteries. With the rapid development of electric vehicles and the gradual rise of energy storage industry, these two fields will also be the focus of lithium battery development in the future. As for the electronic industry, after years of rapid growth, electronic and digital products are expected to show a steady growth trend in the future. With the development of electronic and digital products towards portability, higher requirements have been put forward for battery products, and the battery industry will correspondingly develop towards high energy density, large capacity and light weight. The reliability of the power battery pack is very high, not only to stable discharge, but also to ensure that all the welding line does not fall down, so the welding line welding position is particularly important. Each welding line should be inspected according to national standards, more importantly, in the welding stage to improve the adhesion, so that the welding wire is firm. Cell processing is an important part in the production and assembly process of vehicle power lithium ion batteries. Cell processing includes edge sealing and pole ear leveling. After leveling the polar ear, use a plasma cleaning machine to clean it, which can remove organic matter and small particles and improve the reliability of subsequent laser welding. The vehicle used in the power of lithium batteries is divided into positive and negative, positive and negative from the metal strip leading out of the cell, colloquially said, the battery positive and negative is the contact point when charging and discharging. Whether the contact surface is clean will affect the reliability and durability of the electrical connection. In the production process, the pole ear of lithium battery cell is often uneven, bent or even twisted, which leads to false welding, false welding, short welding and other phenomena during welding. After leveling the electrode ear, impurities such as organics and particles are removed from the electrode ear surface by plasma cleaning machine, so as to make the weld surface roughened, which can ensure good weld effect of the electrode ear. Introduction to the technological process and advantages of the plasma cleaning machine: I. Lithium battery cell core plasma cleaning machine Processing flow: Core feeding → pole ear leveling → plasma cleaning → front side of the core → reverse side of the core → plasma cleaning → core discharging Two, plasma cleaning machine advantages; Plasma cleaning is to excite compressed air or process gas into plasma through high frequency and high pressure, and then conduct physical or chemical reactions with organic matter and small particles to form a clean and slightly roughened surface with no residue after thorough cleaning. The use of plasma cleaning cost is low, almost no waste gas, green environmental protection; Plasma cleaning machine can be installed on the assembly line, and other automatic equipment seamless docking, easy to operate and monitor. Plasma cleaning is a dry cleaning, relying on the active ion in the plasma "activation" to achieve the purpose of removing stains. This method can effectively remove the dirt, dust and other substances on the end face of the battery pole column, prepare for the battery welding, and reduce the bad welding.
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Plasma cleaning instrument PDMS
Polydimethylsiloxane, or PDMS for short, is an organosilicon polymer, plasma cleaning device cleaning PDMS is widely used at home and abroad. All organosilicon have a common siloxane unit, which is composed of one siloxane group. Many side groups can bind to silicon atoms, and PDMS of these side groups are CH3 methyl groups. Si-sh3 is the most common polymer, and its content is also high. A short molecule consisting of only two terminal groups (without dimethylsiloxane monomer units) is hexamethyldisiloxane, which is very important as a process gas for hydrophobic plasma coating plasma cleaning apparatus. PDMS is a linear polymer with a very large molecular weight and is liquid. But it binds to each other and thus has elastic properties. PDMS is a nearly inert polymer with high oxidation resistance that can also be used as an electrical insulating material (microelectronics or polymer electrons) in organic electronics, as well as in biological microanalysis. One of the most common applications for PDMS is in the field of microfluidic systems, where specified polydimethylsiloxane (e.g. Sylgard184) is structured upon request, plasmacytreated, and PDMS chips are permanently coated on glass panels, silicon surfaces, or other substrates. Advantages of pretreatment of plasma cleaning instrument for microflow system: Shorten processing time; PDMS is permanently attached to the substrate surface to form a non-permeable channel of the microfluidic element. The substrate surface of PDMS and hydrophilicity, and thereby completely wetting the channel; Form hydrophilic and hydrophobic waters.
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Nitrogen plasma cleaning machine Manufacturer
According to the nature of gases, plasmas can be divided into the following two types: Gas and the gas plasma: gaseous plasma according to their chemical properties of the gas used when different can be divided into two categories, lively and inert gas gas, inert plasma such as argon (Ar), nitrogen (N2), nitrogen fluoride (NF3) is used, carbon tetrafluoride (CF4), air, gas plasma such as oxygen (O2), hydrogen (H2), etc., the reaction mechanism of different kinds of gas in the process of cleaning, lively plasma have bigger influence on the chemical reaction. Because of the different nature of gases, the pollutants used for cleaning them must also have different choices. If one gas permeates into another or more gases, the mixture of these elements will produce the etching and cleaning effects we want. By using the ions or highly active atoms in plasma, the surface pollutants are smashed apart or formed into volatile gases, which are sent out through the vacuum system to achieve the purpose of surface cleaning. At low pressure in a high-frequency electric field, gas molecules, such as oxygen, nitrogen, methane, water vapor, in a glow discharge, will break down the accelerating atoms and molecules. When the generated electrons are accelerated in the electric field, they can obtain high energy and collide with the surrounding molecules or atoms, so that the molecules and atoms are reexcited by the electrons, but they are in the excited state or ionic state. At this time, the existence state of the matter is the plasma state. In addition to gas molecules, ions and electrons, there are electrically neutral atoms or groups of atoms in a plasma, which are excited by the state of energy (also known as free radicals) and the light emitted by the plasma. Among them, the length and energy of the wave play an important role in the interaction between the plasma and the material surface. In the plasma cleaning process, nitrogen as an inactive gas, mainly as a non-reactive gas, nitrogen plasma treatment can improve the hardness and wear resistance of materials. Sometimes, nitrogen also ACTS as an active gas, forming ammonia compounds. In many cases, plasma cleaner manufacturers use nitrogen or use it as an inactive gas.
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What causes the smell of plasma cleaning machines
The answer is that ozone is at work. The basic principle of ozone generation during plasma discharge is that oxygen molecules are decomposed into oxygen atoms in the low-temperature plasma gas formed in the discharge reactor, and then ozone molecules are formed through the three-body collision reaction, which also takes place in the ozone decomposition reaction. Ozone, chemical molecular formula for O3, also known as triatomic oxygen and superoxygen, because of its fishy taste and named, room temperature can be reduced to oxygen. Compared with oxygen, it is soluble in water and easily decomposed. Ozone consists of an oxygen atom carried by an oxygen molecule, which determines that it is only temporarily stored. The oxygen atoms that carry them are used up by oxidation, and the rest combine to form oxygen into a stable state, so there is no secondary pollution of ozone. If the gas we introduce contains oxygen, a small amount of ozone will be produced during the reaction. It is because of the production of ozone, we can sometimes smell a bad smell when using the plasma cleaning machine, which is also the reason that the plasma cleaning will produce a bad smell. Plasma cleaning machine, also known as plasma surface treatment instrument, is a new high-tech technology, the use of plasma to achieve conventional cleaning methods can not achieve the effect. Plasma is a state of matter, also known as the fourth state of matter, does not belong to the common solid liquid gas three states. By applying enough energy to a gas, it can be ionized into a plasma state. The "active" components of plasma include ions, electrons, atoms, active groups, excited nuclides and photons, etc. The plasma cleaning machine USES the properties of these active components to treat the sample surface, so as to achieve the purpose of cleaning. Conditions for plasma production: sufficient reaction gas and pressure, reaction products must be able to hit the surface of the cleaning object at high speed, and sufficient energy supply. The resulting substances must be volatile micromixtures so that they can be pumped away by vacuum pumps. The capacity and speed of the pump must be large enough to rapidly remove the by-products of the reaction and to replenish the gas required for the reaction.
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Plasma cleaning machine principle and cleaning advantages
Plasma cleaning machine cleaning principle: The plasma cleaning machine USES gas as the cleaning medium, which can effectively avoid the secondary pollution caused by liquid cleaning. A vacuum pump is attached to the plasma cleaning machine, and the plasma in the plasma cleaning chamber constantly washes the material surface during the operation. After a short time of cleaning, the organic pollutants can be effectively cleaned off, and then the pollutants can be removed by the vacuum pump, and the cleaning degree can reach the molecular level. In addition to the super cleaning function, the plasma cleaning machine can also change the surface performance of some materials according to the needs under certain conditions. The plasma ACTS on the surface of the material and changes the chemical bonds of the molecules on the surface of the material so that new surface properties can be formed. For some materials with special purpose, the glow discharge of the plasma cleaning machine not only enhances the adhesion, compatibility and infiltration of these materials, but also can achieve disinfection and sterilization. Plasma cleaning machine is widely used in the fields of optics, optoelectronics, electronics, material science, life science, polymer science, biomedicine, microfluidics and so on. Advantages of plasma Cleaning Machine (compared with traditional process): 1. Able to adopt precise numerical control technology with high degree of cleaning automation; With high precision control device, high precision of time control; Correct plasma cleaning will not produce damage layer on the surface of the product surface quality can be guaranteed; The cleaning process is carried out in a vacuum environment, which is an environmentally friendly cleaning process that does not pollute the environment, and effectively avoids the influence of human factors. The cleaning surface will not be contaminated by secondary pollution. 2. Many materials should be cleaned to change their surface tension and improve their adhesion before they need to be bonded. Plasma material and surface organic pollutants have chemical reaction, the waste gas is extracted by the vacuum pump, so as to achieve the purpose of cleaning the surface of the material. The test results show that the surface tension changes significantly before and after cleaning, which is helpful for the next bonding process. Surface modification of the material before surface spraying can improve the spraying effect of the material. Some chemical materials, such as PP or other chemical materials, are hydrophobic or hydrophilic, but they can also be cleaned by plasma through the above process, modify the surface of the material, so that its hydrophilic or hydrophobic to improve, facilitate the next spraying process. 3, the plasma cleaning machine has online production capacity, and can achieve full automation. Plasma cleaning is a very environmentally friendly process. It is not limited by geometric shape, and can be used for surface treatment of powder, small parts, sheet, non-woven cloth, textiles, hoses, hollow bodies, printed circuit boards, etc. It is a nondestructive process without any mechanical changes to the parts. Besides, it meets the harsh conditions such as clean room, easy to use, flexible and simple to operate, and has remarkable treatment effect for various parts and components. The process conditions are controllable, and the cost is low, the effect is good, and the time is short. The appearance of the treated products will not be affected by the high and low temperature of plasma treatment, and the parts will be less heated. The plasma cleaning machine has the advantages of low operation cost, high process safety and operation safety, and is also a cleaning process with remarkable effect after treatment.
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