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Surface modification of bamboo powder/PETG composites by low temperature plasma treatment technology
Surface modification of bamboo powder/PETG composites by low temperature plasma treatment technology: Wood-plastic composite material is a composite material made of thermoplastics and bamboo fibers with a small amount of chemical additives and fillers and other auxiliary agents, through a special composite method, and has the dual characteristics of plastic and bamboo, that is, it has the following Advantages: good acid and alkali resistance, chemical resistance, salt water resistance, can be used at low temperature, UV resistance, no rot, no cracking or warping and other mechanical properties, low price, long service life, easy to shape, easy to process , recyclable, no formaldehyde and other harmful gas release, etc., has been widely used in automobile manufacturing, construction, transportation, packaging and other fields. However, due to the poor wettability and poor adhesion of the surface of the bamboo-plastic composite material, the bonding process on the surface is greatly affected. In order to improve the wettability of the material surface, the ideal modification method is low temperature plasma treatment technology. Plasma is an ionized gas-like substance", containing electrons, positive ions and neutral particles, a high-energy aggregate of various particles. Plasma is divided into high-temperature plasma and low-temperature plasma according to temperature. Usually, low temperature plasma Plasma treatment techniques are used for the modification of material surfaces. The energy of the active particles in the plasma of low temperature plasma treatment technology is generally close to or exceeds the bond energy of C-C or other carbon bonds, which will modify the surface of the composite material and cause complex physical and chemical changes on the surface of the material, such as Etching, cross-linking, etc. to improve the contact angle and surface energy of the polymer surface. The increase of plasma discharge power of low temperature plasma treatment technology increases the number of active particles in the plasma atmosphere, the energy increases, the etching effect of active particles on the surface of the sample is strengthened, the contact angle of the surface of the sample decreases, and the surface of the sample decreases. Wetting is improved. With the increase of the discharge power, the contact angle of the sample surface increases with the increase of the discharge power. As the treatment time increases, the thickness of the oxide layer increases and the polarity of the oxygen-containing functional groups increases. After low-temperature plasma treatment of the sample, the water absorption rate of the sample increases with the increase of the low-temperature plasma discharge power; after the low-temperature plasma treatment of the sample, the water absorption rate of the sample decreases with the increase of the low-temperature plasma discharge power . This is because after the low-temperature plasma treatment technology plasma treats the sample, increasing the low-temperature plasma discharge power will promote the conversion of inactive particles inside the low-temperature plasma into active particles with higher energy that are easy to participate in the reaction, which is beneficial to the low-temperature plasma. The reaction between the body and the surface of the sample increases the oxygen content on the surface of the sample, the number of polar oxygen-containing functional groups increases, and the water absorption rate increases. With the further increase of the power, the energy obtained by the active particles from the electric field increases, and the probability of the particles colliding with each other increases, resulting in the loss of particle energy and the weakening of the molecular interaction between the active particles and the sample surface, resulting in wetting. The relative decline of the property, the water absorption rate decreased. This is because with the increase of treatment time, the number of polar oxygen-containing functional groups introduced on the surface of the sample increases, and the surface polarity increases. Low-temperature plasma treatment technology After plasma treatment, the amount of -COC on the surface of the sample increases, but with the increase of low-temperature plasma treatment time, the amount of -COC on the surface gradually decreases. The oxide layer thickens, and the attractive -COC on the surface of the sample is further oxidized to -C=O.
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Typical applications of material processing technology for thin film plasma surface treatment machines
Typical applications of material processing technology for thin film plasma surface treatment machines: The plastic film is treated with plasma surface treatment machine treatment technology, and part or all of the material surface treatment can be selected. The mechanical properties of the material did not change before and after treatment. The equipment uses gases and nothing else to effectively clean, activate or coat these thin-film materials by selectively controlling process parameters such as temperature, nozzle position, width and speed. The advantages and characteristics of the plasma surface treatment machine technology for pretreatment of thin films: it has complete "on-line" integration capability (without affecting the original process operation), saves energy, reduces costs, protects the environment, does not change the mechanical properties of the thin film, and can achieve Selective, local cleaning, standard nozzle width, processable width: 2.20 meters or more, double-sided processing of films, effective surface activation, and long-lasting surface treatment effects; additives for surface precipitation The cleaning effect, eliminate the static effect. Good surface pretreatment of plasma surface treatment machine is a prerequisite to ensure the quality of subsequent coatings. For many companies, the environmentally friendly water-based coating process is the core link of their production. The application of plasma pretreatment technology makes water coating technology possible. The plasma surface treatment machine can remove oil and dust from the material, and give the material higher surface energy. The cleaning effect of plasma pretreatment technology can remove oil stains on the surface, the antistatic effect of plasma can remove dust particles attached to the surface, and the chemical reaction effect can increase the surface energy. The comprehensive effect of these aspects makes the plasma pretreatment technology. Becoming an efficient tool, in general, plasma pretreatment does not require additional cleaning steps and primer treatments. Typical applications of plasma treatment, reliable coating adhesion, and plasma surface treatment machine pretreatment technology include automotive and aviation industries, electronic appliances and household appliances manufacturing, daily necessities manufacturing and packaging industries. Pre-treatment ensures strong adhesion of surface coatings on metallic materials such as aluminum, plastic materials such as PP or EPDM, or other materials.
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Pipe and wire plasma cleaning machine surface treatment to improve the surface tension of non-polar plastics
Pipe and wire plasma cleaning machine surface treatment to improve the surface tension of non-polar plastics: The tube wire has a low surface tension, which can adhere well to the paint surface. Surface tension can be maximized in many cases (in fact all cases) to achieve the desired adhesion by using plasma cleaning machine surface treatments. Scenarios for plasma surface activation and cleaning of pipes and wires: The surface of the material is activated by plasma cleaning using an oxygen plasma cleaner and then the plastic wires are etched. This can increase their surface energy. When cleaning the pipe, it is important to increase the surface area, which promotes good bonding. Plasma surface cleaning and activation process: The effect of oxygen plasma on the surface tension of non-polar plastics is obvious. The reason is that, due to the high reactivity of oxygen radicals, polar bonds are formed, which constitute the adhesion points of the coating liquid. In this way, the surface tension is increased, wetting is accelerated and the adhesion is improved.
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Glass plasma spraying plasma cleaning machine surface activation cleaning treatment
Glass plasma spraying plasma cleaning machine surface activation cleaning treatment: Nowadays, when people buy perfume, they not only pay attention to the fragrance, but also pay attention to the packaging. The packaging is as important as the fragrance. At present, plasma cleaning machine technology is used before printing on perfume bottles of big brands. Traditionally, there are only three basic colors for glass production: white, green or brown. In order to produce more delicate glass packaging, many products, such as cosmetic packaging, go through a dyeing process, and metal beverage containers also need to be painted to attract end consumers. Advantages of cleaning and activation treatment before glass plasma spraying: Can be easily integrated into glass plasma spraying production line; reduce reject rate; use innovative glass spraying technology for plasma treatment; fine plasma cleaning machine to improve glass surface microstructure; plasma cleaning activation treatment before glass spraying. The advantages of plasma cleaning machine surface activation cleaning compared to traditional cleaning methods: It can handle samples of various shapes: for samples with complex shapes, plasma cleaning can find the right solution. No additional auxiliary items and conditions are required for the treatment process: the atmospheric plasma cleaner only needs 220 volts AC and CDA compressed air and no additional items and conditions are required. Low operating cost: fully automatic operation, 24-hour continuous operation, no need for manual supervision, operating power can be as low as 600W. Stable treatment effect: The treatment effect of plasma cleaning is very uniform and stable, and it maintains a good effect for a long time after conventional sample treatment. There is no pollution in the whole processing process: the plasma cleaning machine itself is a very environmentally friendly equipment, which does not produce any pollution, nor does it produce any pollution during the processing. The plasma cleaning machine has high processing efficiency and can realize fully automatic online production: as long as the surface of the sample is treated in a short time, the plasma cleaning in the atmosphere can achieve the effect within 2 seconds. It can be matched with the original production line to realize fully automatic online production and save labor costs. Low processing temperature: The processing temperature can be as low as 80 °C and below 50 °C, and the low processing temperature can ensure that there is no thermal shock to the surface of the sample.
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The performance of the modified catalyst by low temperature plasma treatment on Ni/Al2O3 catalyst for CO2 reforming methane
The performance of the modified catalyst by low temperature plasma treatment on Ni/Al2O3 catalyst for CO2 reforming methane: Low-temperature plasma is a system in a thermodynamically non-equilibrium state and has important applications in the field of catalysts. Plasma treatment has the performance of Ni/Al2O3 catalyst for catalyzing CO2 reforming methane. The catalyst surface after plasma treatment and then roasting has high low-temperature catalytic activity and strong anti-carbon deposition ability. Compared with conventional catalysts, the catalyst is prepared by plasma technology, and the dispersion of metal active species of the catalyst is obviously improved, and the catalyst activity is increased. Low-temperature plasma can be effectively used to directly synthesize ultrafine particle catalysts, improve the dispersion of catalyst active components, catalyst surface treatment, precipitation of active components into the matrix, and synergistic effect of catalysts, etc. The catalyst prepared or treated by low temperature plasma has the advantages of large specific surface area and fast reduction rate, thereby improving the catalytic activity of the catalyst. After the low temperature plasma modification, the structure of the solid base catalyst was changed in a friendly manner, the catalytic activity of the catalyst was effectively improved, and the thiol conversion rate was significantly improved. The morphology and particle size of the modified catalysts changed significantly. Compared with the unmodified catalyst, the treated catalyst has obvious particles, but part of it is still amorphous. Plasma-treated catalyst particles are distinct but non-uniform in particle size. The plasma-treated catalyst particles are elliptical and spherical, with uniform size and good dispersion, large porosity and no agglomeration. After the low temperature plasma modification, the average particle size of the catalyst components was reduced, and the particle dispersion of the catalyst was significantly improved. Activated carbon has the advantages of large adsorption capacity, good chemical stability, large specific surface area and large pores, etc. It can be used to adsorb mercaptans in air and liquid phase, and is a suitable catalyst carrier for desulfanization. The use of low-temperature plasma technology can destroy the original crystal structure of the catalyst and generate more holes to improve the activity of the catalyst. The specific surface area of ​​the low-temperature plasma-modified catalyst increases, and the number of micropores increases. Since it is the micropores that determine the adsorption of thiols, and the adsorption capacity also depends on the micropores, the modification of the low-temperature plasma can make the catalyst more active and the conversion rate of thiols higher. Under the action of plasma, a small amount of H2O and CO2 covered by the basic center of the catalyst are further removed, thereby reducing the possibility of reacting with MgO, and the basic center of the catalyst is exposed and enriched on the surface of the catalyst, which is beneficial to improve the reduction performance of the catalyst and adsorption performance, thereby improving catalyst activity.
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Introduction of plasma surface activation cleaning treatment of glass cover plate
Introduction of plasma surface activation cleaning treatment of glass cover plate: According to the requirements of the glass cover plate production line, plasma surface treatment equipment can be used to treat the products. The optional equipment includes: atmospheric plasma cleaning machine, wide-width linear plasma equipment, etc. The energy of the ions and electrons of the plasma can reach 6 eV or even higher. Its major feature is that the ejected plasma is neutral and has no charge. The surface of the treated material can be activated, cleaned and etched in-line. At atmospheric pressure, the plasma size of each nozzle is: diameter ranging from 15 to 90 mm, and nozzle length ranging from 20 to 30 mm. According to the product size and processing width requirements, the online processing glass cover plate plasma cleaning machine equipment can be flexibly selected. The principle of surface activation and cleaning treatment of glass cover plasma cleaning machine: Plasma is composed of a large number of free electrons and ions, and is an ionized gas that is close to neutrality on a macroscopic scale. It is another aggregation state of matter, that is, plasma state, that is, the fourth state of matter. The electrons in the plasma get energy from the electric field, transform into free high-energy electrons, collide with atoms and molecules in the gas, produce excitation and ionization, and generate excited molecules, while atoms, ions and free radicals are extremely unstable, chemical reactions It has strong properties and is prone to reactions that generally cannot occur, resulting in new compounds or weightlessness of the treated material. During processing, the surface layer is etched, resulting in new properties (eg, weight loss, moisture absorption, deepening, adhesion, etc.); or leading to cross-linking, grafting, and polymerization. Plasmas are very different from ordinary gases in their properties. The temperature of electrons in plasma can reach several thousand to tens of thousands of K, while the temperature of gas is very low, about hundreds of degrees Celsius at room temperature, and the energy of electrons is about a few to a dozen electron volts. This energy is greater than the bond energy of polymer materials (several to dozens of electron volts), and can completely break the chemical bonds of organic molecules, thereby generating new bond energy; however, it is much lower than high-energy rays, only with It is related to the surface of the material, so it does not affect the matrix properties. If you have any questions or want to know more, please feel free to consult Chengfeng Zhizao plasma technology manufacturer.
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