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The main function of low temperature plasma treatment

The main function of low temperature plasma treatment

Low temperature plasma treatment can effectively purify, activate, coarsene, etch and deposit the surface of the material.   1. Surface cleaning effect of PLASMA treatment: It can effectively remove organic pollutants and oxides from the surface of objects. Main features: wet cleaning method of cleaning, the surface would include residues, and the low temperature plasma surface treatment can achieve high cleanliness of surface, and the low temperature plasma on the surface of nanoscale materials only, will not change the original characteristics of the material, on the surface cleanliness requirements of high technology, is widely used instead of wet process. Treatment mechanism: it mainly relies on the "activation" of the active particles in the plasma to remove the surface stains. The gas is excited into a plasma state. Heavy particles collide with solid surfaces; Electrons react with active groups on the solid surface and break away from the surface as new gaseous substances. Plasma cleaning technology is characterized by both process base material type of object, can be processing, metal, semiconductor, oxides and most of the polymer materials, such as polypropylene, polyester, polyimide, poly (ethyl chloride, epoxy, and even can well with teflon etc, and can realize the overall and partial cleaning and complex structure.   2. Activation effect of PLASMA processing: Three groups -- C=O Carbonyl, -COOH Carboxyl, and −OH Hydroxyl -- are formed on the surface of an object by low temperature plasma treatment. These groups have stable hydrophilic function and have positive effects on bonding and coating. Main features: part can make the polymer surface active atoms, free radicals and unsaturated bond, the reactive group react with active particles in plasma generated new reactive group, thus increasing the surface energy, change the surface chemical properties, enhance the surface adhesion force and cohesive force, tension, including rubber, composite materials, glass, cloth, metal processing, such as involved in all walks of life.   3. Surface roughening and etching effects of PLASMA treatment: Corresponding different materials use the corresponding gas combination to form the gas equivalent ionization body with strong etching property to have chemical reaction and physical impact with the body on the material surface, so that the solid material on the body surface of the material is gasified to form gases such as CO, CO2, H2O, etc., so as to achieve the purpose of micro-etching. Main features: uniform etching, not changing the characteristics of the material matrix; It can effectively roughen the surface of the material and accurately control the amount of micro-corrosion.   4. PLASMA treatment of coating (deposition and grafting) : The plasma treatment process can also be used for micro-coating of materials. Equipped with two corresponding to different gas into plasma reaction chamber at the same time, two kinds of gas in the plasma environment stimulated and aggregation, produces new compounds deposited on the surface of material to form a new coating, using this kind of special effects of plasma treatment, can put the original is not easy to coating materials coated to the surface of the object, such as heart stents, artificial blood vessels to prevent blood clots, coating materials and scratch-resistant surface hydrophobic coating, etc. Main features: It can break the molecular chain on the surface of the material to generate new active groups such as free radicals and double bonds, followed by cross-linking and grafting reactions. The active gas will polymerize on the surface of the material to produce a layer of sediments, so as to achieve the purpose of surface modification. In fact, in the process of low temperature plasma to deal with things, all kinds of positive and negative ions in plasma, high-energy and high speed motion of the electron, the heavy particles can be processed material surface physical and chemical reaction, so the above mentioned four of low temperature plasma surface treatment (or five) are usually produced at the same time.

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Plasma surface modification of polymers

Plasma surface modification of polymers

In the use of solid polymer materials such as plastic film, rubber and fabric, the properties of the material are not only related to its bulk properties, but also the surface properties of the material account for a considerable proportion. For example, involving adhesion, adsorption, friction, surface hardness, etc. Therefore, surface modification of materials is often carried out in order to meet the requirements of multifunctional materials in modern society. A new dry modification method, plasma surface modification, is introduced in this paper. Plasmas are composed of electrons, ions, atoms, molecules and free radicals, as well as photons. They are generally electrically neutral. Plasma is a state of existence of all kinds of materials, it is the same level of material existence form with solid, liquid, gas, some people say that plasma is the fourth state of matter. In fact, most of the matter around the sun and in the universe exists in plasma. We also see plasmas in our daily life. The most common is flame. A flame can be regarded as a plasma state in which combustible materials release energy and excite air and other volatile gases, which is a "primitive" artificial plasma. At present, among the artificial plasma methods, there are more radiation excitation methods, including radiofrequency glow discharge (10~100MHZ, RF) and microwave discharge (more than 1GHZ, MW). In the surface modification treatment of polymer materials, both of them are used. RF discharge plasma is more commonly used, but the low-pressure plasma generated by MW method is more evenly distributed and the surface treatment of the material is more uniform.

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How to maintain plasma TV products

How to maintain plasma TV products

With the current plasma TV technology update, more friends bought plasma TV, especially like watching big movies and playing games friends are more keen on plasma TV, this is because of the technical advantages of plasma TV. Below I discuss with everybody when maintaining plasma TV, must pay attention to item. 1. Avoid heat, moisture and dust Plasma TV is well-known for its high power, so it must ensure its heat dissipation effect, otherwise it will cause fatal damage to the plasma screen, or even burn out. Do not cover the machine when the TV is on, and pay attention to ventilation. Every period of time to pay attention to clean the dust, to prevent the dust with static electricity this "invisible killer", and pay attention to moisture. 2. Avoid long-term image freeze The early plasma products are prone to local screen burns after long-time use, which makes the screen stay in one picture for a long time, just like people can't get rest from their hard work. In the case that the emission state of each plasma gas chamber remains unchanged for a long time, the picture will linger on the screen like a shadow. Therefore must not let the plasma TV fixed in the same picture for a long time, to avoid this irreparable damage. 3. Wipe the screen carefully Screen dust attracted by static electricity is inevitable, and we often have to clean the screen. But did you know that if you don't clean it properly, you can damage the screen and regret the quality of the picture? First, wipe the screen not too often, using a dedicated screen to wipe the material or soft cotton cloth. Also, do not wipe the screen with chemicals that can damage the oxide coating used to enhance the screen. Water is also not a very good cleaner because it leaves water marks on the screen. You can choose a dedicated plasma screen cleaner. 4.Ask a technician to disassemble the TV If you need to disassemble a plasma TV, don't do it yourself. Because you don't know which parts are critical, if you break a key part of the TV, it won't pay to replace it. And the plasma screen is with high voltage, private disassembly is very easy to shock, which is closely related to life.

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Application of low temperature plasma cleaning machine in the field of conductive polymer material preparation

Application of low temperature plasma cleaning machine in the field of conductive polymer material preparation

Conductive plastic, as a kind of polymer material, is a very active research and development field in the world at present. It has developed from pure laboratory research to applied research stage and become a new generation of electronic materials. Conductive polymer materials can be divided into two categories according to their conductive mechanism: structural type and composite type. At present, the synthesis of structural conductive polymer materials is more complex and costly. But the composite conductive polymer material processing is simple, low cost, so it is widely used in electronics, automobile, civil and other fields. Structural conductive plastic is a functional polymer material that mixes resin and conductive material and processes it in a plastic way. Mainly used in electronics, integrated circuit packaging, electromagnetic shielding fields. Conductive plastics are generally classified in the following two ways: (1) Photoelectricity performance classification, can be divided into: insulator, antistatic body, conductive body, high conductor. Resistance in 1010 Ω cm more often called insulators; Resistance in 104 ~ 109 Ω cm range called semiconductor or anti-static body; Resistance under 104 Ω cm are called conductive body; Even lower resistance under 100 Ω cm are called high conductor. (2) Manufacturing methods of electric plastics can be classified into structural conductive plastics and composite conductive plastics. Structural conductive plastic, also known as intrinsic conductive plastic, refers to the conductive plastic itself or the conductive plastic after chemical modification. Structural conductive polymer materials mainly include: (1) conjugated polymers: such as polyethylene, (Sr) N, linear polybenzene, layered polymers, etc.   (2) Metal chelates, such as polyketone phthalocyanine;   (3) Charge mobile polymer complex: such as polycation, CQ complex. The production cost of structural polymer materials is high, the process is difficult, so far there is no mass production, now widely used conductive polymer materials are generally composite polymer materials, the main filling materials are: a. Metal dispersion system; B. Carbon black system; C. Organic complex dispersion system; D. Carbon fiber. Low temperature plasma cleaning machine can be divided into: Antistatic materials, conductive materials and electromagnetic shielding materials. The effect of conductive packing on conductivity can be described by tunneling theory. Conductive plastics also conduct electricity because electrons can pass through the gaps between conductive fillers. At a certain critical concentration, the electrons can conduct electricity through the pores between the conductive fillers as long as the spacing between the conductive fillers is reduced by a very small part, and then the resistivity will change suddenly and the conductive plastic will change from the original insulator to conductor, which will produce the percolation effect. The percolation concentration of carbon black filled LDPE compound is related to the structure of carbon black. The percolation concentration of the specially conductive carbon black filling compound is lower than that of the acetylene carbon black filling compound. It is difficult to achieve the critical concentration in the production process, but it is easy to achieve the critical concentration by low temperature plasma treatment. Characteristics of atmospheric plasma cleaning machine in spraying process: (1) There are many optional coating materials, including metals, alloys, ceramics, cermets, carbides and others. (2) Coating equipment can use layers of different materials. (3) Produce surfaces suitable for a variety of applications, including a variety of different wear and corrosion resistance mechanisms, required thermal or electrical properties, surface repair and dimensional control. (4) Precise control of coating thickness and surface characteristics, such as voidage and hardness. (5) There is no distortion of heat-affected area or parts. (6) High deposition rate (7) Strong adhesion between coating and substrate (8) Coating with complex geometric shapes (9) Easy to cover areas that should not be sprayed (10) The process can be fully automated

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Plasma cleaning machine several frequency differences and applications

Plasma cleaning machine several frequency differences and applications

There are three commonly used plasma excitation frequencies. The plasma with excitation frequency of 40kHz is ultrasonic plasma, the plasma with 13.56MHz is rf plasma, and the plasma with 2.45GHz is microwave plasma. The self-bias voltage of the ultrasonic plasma is about 1000V, and that of the rf plasma is about 250V. The self-bias voltage of the microwave plasma is very low, only a few tens of volts. Moreover, the mechanisms of the three plasmas are different. The reaction in ultrasonic plasma is physical reaction, the reaction in rf plasma is both physical reaction and chemical reaction, while the reaction in microwave plasma is chemical reaction. Ultrasonic plasma cleaning has a great influence on the surface to be cleaned, so rf plasma cleaning and microwave plasma cleaning are mostly used in semiconductor manufacturing applications. Ultrasonic plasma is used in surface degluing, burring and polishing, etc. The typical plasma physical cleaning process is plasma cleaning with argon added in the reaction chamber as the auxiliary treatment. Argon itself is an inert gas. The plasma does not react with the surface, but it is cleaned by ion bombardment. The typical plasma chemical cleaning process is oxygen plasma cleaning. Oxygen radicals produced by plasma are very reactive and easily react with hydrocarbons, producing volatile substances such as carbon dioxide, carbon monoxide and water, thus removing pollutants from the surface. Plasma cleaning is given priority to with physical reaction, also known as sputtering etching (SPE) or ion milling (IM), its advantage lies in itself does not produce chemical reaction, will not leave any clean surface oxide, can keep the cleaning chemical pure sex, there is a kind of surface reaction mechanism of plasma cleaning is plays a significant role in physical and chemical reaction, the reactive ion etching or reactive ion beam etching, two kinds of cleaning can promote each other, by ion bombardment cleaning surface damage weaken its chemical bonds or atomic state formation, easy absorption of reactant, ion collision that is cleaning heat, making them more likely to respond; Selecting 40KHZ ultrasonic plasma and adding appropriate reaction gas can effectively remove gum residue, metal burrs and so on. Microwave plasma of 2.45ghz is often used in scientific research and laboratory.

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Plasma surface treatment equipment for a variety of industry applications

Plasma surface treatment equipment for a variety of industry applications

Plasma surface processor is widely used in printing and packaging, silicone rubber products, glass precision, wire and cable, digital electronics, automobile manufacturing, medical biology, textile industry, composite materials and new energy, almost all the industrial fields of mechanical equipment. Generally, the particle energy in the low-temperature plasma is about several to a dozen electron volts, which is larger than the bonding energy of polymer materials (several to a dozen electron volts). It can break the chemical bonds of organic macromolecules and form new bonds, but it is far lower than high-energy radioactive rays. It only involves the material surface and does not affect the performance of the matrix. The thermodynamic equilibrium conditions of low temperature plasma, electron has high energy, can fracture of material surface molecular bonds, improve particle chemical reactivity (more than hot plasma), and neutral particles temperature close to room temperature, these advantages for heat-sensitive polymer surface modification provides appropriate conditions. Through low temperature plasma surface treatment, a variety of physical and chemical changes take place on the surface of the material, or etching and rough, or forming a dense crosslinking layer, or introducing polar groups containing oxygen, so that hydrophilicity, adhesion, coldability, biocompatibility and electrical properties can be improved. Plasma-treated paste box material: with OPP, PP, PE coated cardboard; Cardboard with PET coated film; Plasma processor: ★ Board with metal coating; ★ Cardboard with UV coating (UV oil curing itself can not be delaminated); ★ Impregnated cardboard; ★PET, PP transparent plastic sheet, etc.   Plasma equipment in the printing industry: Application of plasma surface processor in printing and packaging industry: using plasma surface processor to treat cementing surface process can improve bonding strength, reduce cost, stable bonding quality, good product consistency, no dust generation, clean environment. It is the solution to improve the product quality of pasting box machine. The material types of processing include: with OPP, PP, PE coated board, with PET coated board, with metal coating board, with UV coated board (UV oil curing itself can not be delaminated), impregnated board, PET,PP and other transparent plastic sheet. Its processing effect has been recognized and recognized by famous printing companies at home and abroad.   Plasma equipment in the digital industry: Plasma surface processors in the digital industry: Plastic as a new material to replace metal, the surface paint is not easy, consumers often bought mobile phones, laptops or digital cameras less than a month after the surface paint or keyboard fade problems. If treated by other chemical methods, the price is high and the pollution is high. While the use of digital dedicated plasma processor processing surface color slightly lighter, the reverse luminosity reduced, touch can feel the surface slightly rough; The adhesion property of spray paint is greatly enhanced. Plasma surface processors are already widely used in nokia, Apple, Konka and other mobile phone cases and keyboards.   Plasma surface processors in the automotive industry: Application of plasma surface processor in automobile industry: at present, it has been widely used in car lights, various rubber seals, interior decoration, brake block, wiper, oil seal, instrument panel, airbag, bumper, antenna, engine seal, GPS, DVD, instrument, sensor. Car door seals: if you want to paint or flocking on its surface, because its material is mostly rubber products, it is not easy to stick. An on-line plasma processor is the ideal solution if chemical cleaning is not only off-line but also polluting the environment. In the treatment of automobile lamps, the cementation is used to meet the leakproof requirements between the mirror and the shell. The surface of the cementation is pretreated with the plasma surface processor, and the result of the cementation is cheap and high quality, which is closely combined with the production line to achieve continuous production. At present, it has passed the treatment of byd, Chrysler, GENERAL Motors, Audi and other vehicles, with remarkable results. To be the first choice of most well-known auto manufacturers or auto parts suppliers in China.   Plasma-bonded cell phone case: In order to make the appearance of mobile phones more sophisticated, mobile phone cases are usually glued together or printed with brand logos or decorative strips. The previous mobile phone shell is composed of ABS, its surface tension is high, generally do not need to deal with. But with the wide use of PC, nylon + fiberglass and other materials, no treatment can no longer increase the surface tension of the substrate to the required value of glue. The efficient processing capab

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