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The characteristics of the monomer selective solvent effect of plasma-initiated polymerization of plasma activation machine

The characteristics of the monomer selective solvent effect of plasma-initiated polymerization of plasma activation machine

The characteristics of the monomer selective solvent effect of plasma-initiated polymerization of plasma activation machine: The decaying chain transfer (DT) polymerization of iodine transfer is achieved by adding a chain transfer agent containing iodine to the polymerization system to establish a reversible chain transfer balance between free radicals and iodine, thereby achieving the purpose of controlled/living free radical polymerization. DT polymerization has obvious advantages, including easy access to chain transfer agents, wide adaptation of monomers, low requirements for polymerization conditions, and diversified polymerization methods. Iodoforms such as iodoform, ethyl iodoacetate, and iodoacetonitrile have been used in DT controlled/living polymerization as chain transfer agents. The active species of plasma-initiated polymerization by plasma activation machine can be terminated by conventional free radical polymerization inhibitors, and the sequence structure of random copolymers is also similar to ordinary free radical copolymers, so it is generally believed that they follow the free radical polymerization mechanism. However, plasma-induced polymerization has unique phenomena, such as long-lived active species, solvent effects, monomer selectivity, and monomer concentration dependence of the maximum polymerization rate. These characteristics cannot be explained by traditional free radical polymerization theory. . The structure of plasma-initiated polymerization active species has the viewpoints of ionic radicals, diradicals and cations. The PP film is treated with Ar plasma, the plasma active species generated on the surface can initiate the polymerization of vinyl monomers, and follow the free radical polymerization mechanism. Exposing the PP film treated by the plasma activator to the air, the free radicals on the surface of the film will immediately react with oxygen to generate peroxide, and the peroxide initiates polymerization into a classic free radical polymerization. Introducing alkyl iodide into plasma and peroxide initiation system can realize DT controllable/living polymerization. There are active species on the surface of the PP film of the plasma initiation system of the plasma activation machine and the plasma atmosphere. In the peroxide initiation system, due to the homolysis of the peroxide, the free radicals on the surface of the PP film will also be easily Into the solution, the polymerization system will simultaneously undergo PP surface graft polymerization and solution polymerization. In RAFT graft polymerization, the surface of the carrier has the same activity as free radicals in the solution. Therefore, it can be considered that the molecular weight of PAAc grafted on the surface of the PP film is equivalent to the molecular weight of PAAc in the solution. Because the graft polymerization is a heterogeneous reaction, the graft polymerization rate on the surface of the PP film is much lower than the polymerization rate in the solution. Therefore, it can be speculated that the molecular weight of the PAAc chain grafted on the surface of the PP film will also be much smaller than the PAAC obtained in the solution polymerization. Homopolymer molecular weight. The monomer selectivity and solvent effect of the plasma-initiated polymerization of the plasma activation machine cannot be explained by the classic free radical polymerization mechanism, which indicates that the active species in the plasma-initiated system is an "atypical" free radical. The difference in polymerization behavior indicates that ordinary free radicals are easier to combine with iodoform into the controllable state of DT polymerization than plasma active species. For peroxide and plasma-initiated DT polymerization, the grafting amount is directly proportional to the molecular weight, indicating that the chain length of the grafted chain or the size of the grafting amount can be easily adjusted by controlling the polymerization time. This behavior is for porous The graft modification of the membrane surface is of great significance. The contact angle of the grafted surface of DT polymerization initiated by plasma and peroxides continued to decrease with the increase of the grafting amount. This is due to the increase of hydrophilic carboxyl groups on the surface. The contact angle curve of the former is obviously lower than that of the latter, indicating that the longer PAAc graft chain under the same graft amount is more conducive to the reduction of contact angle. In plasma DT polymerization kinetics treatment, the surface grafting amount of PP film is proportional to the polymer molecular weight. At the same time, as the grafting amount increases, the surface contact angle also gradually decreases.

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Surface modification of the low-temperature plasma generator improves the corrosion resistance and bonding performance of the plastic metal layer

Surface modification of the low-temperature plasma generator improves the corrosion resistance and bonding performance of the plastic metal layer

Surface modification of the low-temperature plasma generator improves the corrosion resistance and bonding performance of the plastic metal layer: The low-temperature plasma generator generates high-pressure and high-frequency kinetic energy during arc discharge, thereby generating plasma. This plasma technology is excited and controlled in the seamless steel tube of the nozzle. Use air compression to spray plasma technology on the surface of the product. When the plasma technology touches the surface layer of the solution, object changes and chemical reactions occur. The surface layer has been cleaned, and oxygen-containing compound stains (such as edible oil, auxiliary additives, etc.) have been etched, uneven, or a high-density chemical cross-linked layer has been formed, or due to the introduction of methyl and carboxyl groups, it has Promote the adhesion of a variety of architectural coatings, and improve the adhesion and painting applications. The surface layer is treated by ion treatment with a low temperature plasma generator, and a very thin ductile coating can also be obtained, so that the surface layer has good adhesion, coating and printing properties. No need for other industrial equipment, analytical chemical solutions and other strong multifunctional components can improve adhesion. Plasma treatment of daily necessities and electronic products. Surface treatment of high-end furniture, no sanding and polishing, immediate spraying, no paint falling, surface treatment before bonding, surface treatment before bonding and smooth coating, surface treatment before printing, the coating is hard, and the paint does not fall after printing. Plasma surface modification materials can improve the corrosion resistance of the metal surface layer. Improve the bonding performance of the metal surface. Improve the strength and wear resistance of metal materials. Surface vulcanization treatment for rubber and plastic industry. Pretreatment of laminated glass makes the bonding more waterproof, and can be used for printing, bonding, sizing and other sound insulation and noise reduction. The glued glass fiber reinforced plastic products have previously undergone plasma technology solutions, display crimping pretreatment, surface treatment of the circuit board on the LCD soft film, and pretreatment of the harder bonded parts to ensure the robustness of mobile phone shells and notebook cases Bonding. The paint is not easy to fall off to the frame of the mobile phone and the notebook computer, the shell is stuck together, the shell is not easy to peel off, the text is not easy to fade, the mobile phone and the notebook keyboard are stuck together, and the computer keyboard text is not easy to peel off. The surface treatment of the low-temperature plasma generator is carried out in the plastic surface treatment tube to improve the adhesion of printing, the surface printing of beverage bottle caps, skin care products, the bonding surface treatment of small toys, the bonding of beneficial substances, and the bonding of shoe uppers. Pretreatment such as connection to ensure that the super glue does not open, low temperature plasma treatment, low temperature plasma application in the printing and dyeing industry. Protein chemical fiber solves to improve water absorption, man-made fiber adsorbent solves, improves water absorption, cellulose fiber solves static electricity, and improves coloring characteristics and dye digestibility. . The use of low-temperature plasma generators in medical equipment as the treatment of biotechnology medical catheters, the combination of surface treatment is more tight. The surface treatment of human prosthesis materials can take into account the hydrophilic problem of compatible medical consumables. The low-temperature plasma surface treatment of ceramic surface coatings has been carried out previously. The pretreatment of solid ceramic varnish to enhance the adhesive force, used for special cable printing, excellent inkjet printer printing effect, fiber optic cable printing, laser engraving, chemical fiber cross printing, full transparent printing, durable cars and Shipbuilding industry automobile sealing strip extreme color fastness bonding surface treatment, more inseparable bonding, sound insulation and noise reduction, anti-fouling car lamp bonding processing technology, strong bonding, anti-staining, waterproof car brake pads, frame sealing, Bumper coating pretreatment, seamless splicing of the inner surface of the car, solved by dipping printing, no fading, no painting, low-temperature plasma generator pre-bonding various raw materials in the shipbuilding industry, printing and packaging industry mineral water bottles and The jam jar is extremely sticky to achieve the purpose of firmness and credibility.

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Examples of processing metal aluminum by Chengfeng Zhizhi plasma cleaning machine manufacturers

Examples of processing metal aluminum by Chengfeng Zhizhi plasma cleaning machine manufacturers

Examples of processing metal aluminum by Chengfeng Zhizhi plasma cleaning machine manufacturers: The plasma cleaner mainly relies on the activation of active ions such as electrons, ions, excited atoms and free radicals in the plasma to gradually decompose large molecules and organic pollutants on the metal surface to produce stable volatile organic compounds. Small molecules sticking to the surface are Break away completely to be cleared. At the same time, plasma cleaning can greatly improve the adhesion performance and surface wettability of the metal surface, and the improvement of these properties will further promote the development of metal materials. At the same time, surface treatment is also very beneficial. With the rapid development of the high-tech industry, the plasma cleaning technology of Chengfeng Zhizhi plasma cleaning machine manufacturers is becoming more and more widely used, and it has been widely used in high-tech fields such as electronics, semiconductors, and optoelectronics. Applications. The following is an example of the processing of metal aluminum by the manufacturer of the plasma cleaning machine manufactured by Chengfeng Zhizhi: After the surface treatment of the plasma cleaner, the contact angle dropped from the initial 87.7° to 19.1°, which greatly improved the surface wettability of metal aluminum.

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Low-temperature plasma surface treatment technology improves crop seeds and increases insect resistance and germination rate

Low-temperature plasma surface treatment technology improves crop seeds and increases insect resistance and germination rate

Low-temperature plasma surface treatment technology improves crop seeds and increases insect resistance and germination rate: In recent years, with the increasing maturity of low-temperature plasma surface treatment technology, plasma seed technology has begun to be applied to agricultural breeding, which is still a new research field at home and abroad. The low-temperature plasma surface treatment technology uses plasma to clean the surface of the seeds to improve the vigor of the seeds, so that the treated crops have a strong growth advantage throughout the growth period from germination to maturity, and achieve the purpose of increasing yield and resistance. This shows that plasma surface treatment has the following main functions in breeding: 1. Significantly improve germination potential and germination rate: Plasma surface treatment can promote seed germination and make seeds germinate 1 to 2 days ago. Germination vigor and germination rate have also been significantly improved, and the germination rate of stale seeds and varieties with low germination rate can be increased by 10%~15%; 2. Prevention and control of diseases and insect pests: The surface treatment of seed plasma can effectively kill the germs on the surface of the seeds, thereby improving the disease resistance of the seeds during germination and significantly reducing the occurrence of diseases at the seedling stage; 3. Improve stress resistance: Plasma surface treatment can activate the activities of various enzymes in seeds, thereby improving the tolerance of crops to drought, salinity and low temperature. 4. Obvious advantages in growth: After seed plasma surface treatment, seed vigor and various enzyme activities are significantly improved, which significantly promotes the growth of plant roots, and the root coefficient and dry matter weight are significantly increased. Mainly manifested as thick and knotty rhizomes, rapid growth and development, vigorous crop growth, and generally strong plants; 5. Promote early maturity to increase yield: low-temperature plasma surface treatment technology is used to improve the processed crop seeds to make their fruits mature early and increase grain yield by 8% to 12% on average.

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Plasma surface treatment machine solves the problem of surface cladding coating cracks and makes the coating widely used

Plasma surface treatment machine solves the problem of surface cladding coating cracks and makes the coating widely used

Plasma surface treatment machine solves the problem of surface cladding coating cracks and makes the coating widely used: Compared with laser cladding technology, plasma technology of plasma surface treatment machine has the characteristics of high energy conversion efficiency, small equipment investment and simple operation and maintenance. It has achieved unprecedented development in recent years. The use of plasma technology has achieved similar laser cladding coating. The flame spraying composite powder and plasma are prepared by the carbonization composite technology of the drive body. Carbon is not only a reactive component, but also a binder in the composite powder. Each plasma forms an agglomerated structure in which fine raw powder particles are coated and bonded by carbon. . The carbon formed after the carbonization of organic matter has a strong adsorption effect, which can bind the raw material powder together so that the plasma has a high bonding strength during powder feeding. The density of the carbonized composite powder particles is almost the same, and the particle size and fluidity are also basically the same. It is expected to solve the key problem of consistent powder fluidity in plasma technology. The problem of surface cladding coating cracks has always been a bottleneck restricting the wide application of coatings. At present, a reasonable design of coating composition is an effective coating diameter to solve the problem of coating cracks. The characteristics of precursor carbonization composite technology and plasma technology. Through the design and research of plasma cladding coating reaction alloy components, high-quality anti-crack plasma coatings are prepared. The microstructure of TiC-reinforced high-chromium iron-based (Fe- -Cr-C-Ti) coating is a large number of gray-black granular and dendritic phases distributed on the substrate. The coating is composed of austenite (A) and a total of Crystal phase (Cr, Fe), C3 (B) and in-situ; synthesized TiC phase (C) composition. The volume fraction of TiC particles near the fusion zone of the coating is small, and the volume fraction of TiC particles in the middle of the coating is slightly larger. The volume fraction of TiC particles on the coating surface is larger. The shape of TiC particles in the fusion zone and the middle area of ​​the coating is mostly equiaxed particles, while some of the particles in the surface area of ​​the coating are dendrites. This is due to the heat transfer in the molten pool and the local unevenness of Ti and C concentrations, which are easy to grow on TiC. The front forming component is too cold and the exothermic effect of the TiC in-situ synthesis reaction makes Ti and C atoms rapidly diffuse and nucleate to the front end, forming more dendritic TiC particles. In addition, because the density of TiC particles is smaller than that of Fe-Cr melt, they tend to float and aggregate under the stirring of the molten pool. Therefore, if they are close, there are more TiC particles on the surface area of ​​the coating; and there are fewer TiC particles in the bottom area of ​​the coating. . The rapid heating and rapid cooling in the plasma treatment process of the plasma surface treatment machine lead to large thermal stress in the coating, which leads to cracking of the coating. The surface of the Fe-Cr-C-Ti coating is somewhat rough, but there are no cracks. This is because Ti is added to the carbonized composite component of the Fe-Cr-C coating, and Ti+C<→TiC reaction occurs to synthesize TiC particles in situ. The formation temperature of TiC is higher than the precipitation temperature of primary carbides. Then, these dispersed TiC particles may be used as a heterogeneous nucleation substrate of primary carbides to refine or eliminate chromium primary carbides. C3 primary carbides are improved (Cr, Fe), C3 eutectic structure increases a lot of austenite structure, austenite has excellent strength and toughness at high temperature and normal temperature, which can provide a strong wear-resistant reinforcing phase of the coating Support to reduce the cracking and peeling tendency of coated parts during service. Therefore, the synthesis of a large number of TiC particles and the formation of austenite structure, the reduction or elimination of (Cr Fe) and C3 primary carbides, the improvement of (Cr, Fe) and C3 eutectic structure, effectively improve the toughness of the coating. The generation of coating cracks. Generally speaking, the amount of wear when a part is rubbed is related to the contact stress, relative speed, lubrication condition and the material of the friction pair; and the wear resistance of the material is related to the hardness and microstructure of the material. Therefore, plasma surface treatment machine to improve the surface hardness of the coating is an important way to improve the performance of materials.

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Tips for distinguishing between radio frequency plasma cleaner and intermediate frequency plasma cleaner

Tips for distinguishing between radio frequency plasma cleaner and intermediate frequency plasma cleaner

Tips for distinguishing between radio frequency plasma cleaner and intermediate frequency plasma cleaner: The intermediate frequency plasma cleaner is an intermediate frequency. The 40KHz intermediate frequency power supply uses 16-bit microprocessor as the core, power electronic devices as the power output unit, and adopts new technologies such as digital frequency division, phase lock, waveform instantaneous feedback, SPWM pulse width modulation, IGBT output, etc. , And adopts a modular structure, with strong load adaptability, high efficiency, good stability, good output waveform quality, simple operation, small size, light weight, intelligent control, abnormal protection function, adjustable output frequency, fast output response , Strong overload capacity, fully isolated output, long life, good damage resistance. This kind of power controller is used on intermediate frequency ion equipment. RF plasma cleaners use RF power, that is to say, the difference between our intermediate frequency plasma cleaner and RF plasma cleaner lies in the matching power they use. RadioFrequency, or RF for short. RF is RF current, which is an abbreviation for alternating high-frequency electromagnetic waves. The alternating current is called low-frequency current when it is below 1000 per second, and it is called high-frequency current when it is above 10000. The radio frequency current is this kind of high-frequency current. Therefore, we will easily distinguish between these two types of equipment.

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