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Low temperature plasma treatment to improve the water resistance of wood bonding strength

Low temperature plasma treatment to improve the water resistance of wood bonding strength

Because of its excellent performance and environmental protection factors, wood-based panel plays an important role in furniture, building materials and other fields. However, the wood-based panels made of urea-formaldehyde resin glue, phenolic resin glue and melamine formaldehyde resin glue are widely used at present, which have problems such as large consumption of petroleum resources and continuous release of formaldehyde. In order to further improve the environmental protection of wood-based panel products, soybean protein adhesive (soybean gum) was modified by physical, chemical or biological methods to make the wood surface have good wettability, which has been widely paid attention in the field of wood adhesive. However, compared with aldehyde adhesives, bean adhesives still have some shortcomings in terms of water resistance, bonding strength and adhesive quantity. In order to improve the quality of wood-based board, plasma surface modification is one of the effective methods to improve the wettability of glue on board surface. A large number of polar oxygen-containing functional groups can be formed on the surface of poplar veneer under oxygen RF plasma treatment, and the surface roughness is improved, which is beneficial to adhesive bonding. Using atmospheric pressure air dielectric barrier discharge plasma technology to treat veneer surface simplifies the process and creates conditions for industrial application. The parameters such as plasma treatment speed and power have obvious effects on the physical and chemical properties of the sheet surface. Wood was modified by atmospheric plasma to improve its surface wettability. Using nanocellulose (NCC) modified soybean glue as binder, the surface of poplar veneer was treated by atmospheric pressure air dielectric barrier discharge plasma to prepare soybean glue plywood. After atmospheric plasma treatment, the wood surface was etched, and a large number of polar functional groups were produced, which improved the wettability of the glue on the wood surface, thus increasing the bonding strength of the wood, and further reducing the amount of adhesive. On the one hand, the surface of poplar veneer is physically etched and micro-nano pores are produced after plasma treatment, which is beneficial to the penetration of modified soybean gum into the veneer surface. On the other hand, the high-energy particles generated by the atmospheric low temperature plasma make the surface of poplar veneer change chemicly, produce more polar functional groups containing oxygen and nitrogen, improve the polar interaction between the glue and wood, and make the glue more easily penetrate into the pores of the veneer surface, forming a deep nail structure. Therefore, the interfacial bond strength of the plywood treated by low temperature plasma can be significantly improved, and the bond strength of the plywood treated by low temperature plasma can reach 0.78MPa, which is increased by 20% and reaches the national standard. This indicates that the normal pressure and low temperature plasma treatment can reduce the amount of glue and reduce the production cost under the condition that the bonding strength reaches the standard. The high energy particles in the plasma impact the wood surface at high speed and degrade the polymer in the wood cell wall. These small irregular scratches on the surface of poplar increased the surface roughness, promoted the penetration of modified bean gum into the surface of poplar veneer, and increased the interfacial bonding strength. The surface of poplar veneer was etched to form a microporous structure, and the surface roughness of veneer was increased, which improved the permeability of nano-cellulose modified soybean gum. After treatment, new free radicals were generated on the surface of poplar veneer, which enhanced the polarity between modified bean gum and veneer surface.

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Plasma cleaning system Plasma metal surface cleaning technology

Plasma cleaning system Plasma metal surface cleaning technology

Using low temperature plasma cleaning system, will not cause any damage to the product, and low temperature plasma metal surface cleaning technology is widely used in the change of the surface mechanical properties of metal materials, such as material wear, hardness, friction, fatigue, corrosion resistance, etc. 1, enhance the adhesion of the metal surface: After the special metal low temperature plasma surface treatment machine, the surface morphology of the material has a microscopic change, the low temperature plasma surface treatment machine to the metal material, can make the adhesion of the material surface to reach more than 70 daines value, can meet a variety of bonding, coating, printing and other processes, at the same time to achieve the effect of eliminating static electricity. 2, enhance the corrosion resistance of the metal surface: Existing plasma ferroalloy cleaning machines can improve the friction and corrosion properties of ferroalloys. Because the plasma is injected into the product from all directions at the same time, there is no size limit, so it can handle the more complex shape of the sample. Low-temperature plasma surface treatment technology is used to coat the metal surface with polyphenylene, aluminum coating and other technologies are mostly used to protect the metal surface of spacecraft. 3, improve metal hardness and wear resistance: The early research on the application of plasma immersion ion implantation mainly focuses on the surface treatment of metal materials by nitrogen plasma. The results show that the surface wear resistance of the product is improved due to the formation of TiN and CrN superhard layers. In addition to plasma dry cleaning, there are chemical cleaning. 1. Passivation processing: After being soaked by special agents, a dense passivation film is formed on the surface of stainless steel, iron and copper materials to isolate the product from space and prevent the oxidation of the workpiece surface. Characteristics: the color of the passivation film will not change the size and color of the workpiece. And the original solution is impregnated at room temperature (in addition to stainless iron, stainless iron needs to be heated). 2. Pickling passivation: What is the effect of pickling passivation? It is composed of pickling and passivation of two in one potion, also for the original liquid normal temperature soaking treatment, but not suitable for stainless steel use. After pickling and passivation, the surface of the workpiece is matte silver white. Can effectively remove weld spot.

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Air plasma surface treatment machine to improve the quality of spraying printing or bonding

Air plasma surface treatment machine to improve the quality of spraying printing or bonding

In order to make products, including all kinds of plastic products, have better spray, printing or bonding quality, product surface treatment is required. Traditional surface treatment techniques include mechanical polishing, chemical solvents, flame, corona and other different treatment methods. These processes have their own technical advantages and characteristics, but they also have their limitations in technology and application. Atmospheric pressure plasma treatment technology is a new technology for plasma surface treatment. Compared with the traditional treatment technology, the treatment effect, operation safety, treatment cost, application adaptability and environmental protection have been significantly improved. So let's talk about what plasma is. Solid, liquid and gas are three common aggregation states of matter, the process of substance changing from solid to liquid and then to gas. If we continue to apply energy to the gas, the velocity of molecules in the gas will be further accelerated, forming a new aggregate state of matter, including ions, free electrons, excited state molecules and energetic molecular fragments, known as the fourth state of matter -- "plasma state". Atmospheric plasma surface treatment machine is in the atmospheric pressure to produce plasma, product surface treatment. With the aid of the plasma spray gun, atmospheric plasma introduces air or other process gases into the spray gun, and at the same time introduces a high frequency and high voltage current to apply energy to the gas. The plasma needed comes out of a nozzle at the front of the gun, and the resulting plasma is electrically neutral, so it can be used not only to treat plastics, but also metals, glass and other materials. The influence of plasma treatment on the material surface is mainly manifested in three aspects: 1. clean the surface, remove organic and inorganic pollutants. 2. Surface activation improves the surface energy of the material. 3. Eliminate static electricity. Plasma cleaning surface can not only remove inorganic pollutants such as dust on the surface of materials, but also decompose organic pollutants such as oil on the surface. Surface activation of plastic materials can greatly improve the surface energy by forming new active functional groups on the surface of the materials. It can improve the inert surface below 30mN/m to 72mN/m hydrophilicity Atmospheric pressure plasma treatment technology is widely used for surface treatment of plastic, metal or glass materials in various adhesive treatment, spraying treatment and printing treatment processes. The resulting clean, highly active surface makes it easier to bond, spray and print, thus improving processing quality, reducing processing costs and improving processing efficiency.

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Factors influencing the cleaning effect of copper support treated by copper surface plasma

Factors influencing the cleaning effect of copper support treated by copper surface plasma

To make sure that the copper wire frame or metallic stents in the lineup and seal model is reliable, increase yield, usually adopts the plasma cleaning machine to plasma cleaning of copper wire bracket, the plasma cleaning effect is affected by many factors, in the past the spotlight focused on copper wire stents themselves, as well as the selection of plasma cleaning equipment and parameters. But in fact, several factors of the material box itself will also have a large impact on the plasma treatment effect. 1. Specification and size: Copper wire frame in different sizes of the corresponding use of the box size is not the same, and the box size and plasma cleaning effect has a certain relationship, in general, the larger the box size, the longer the plasma into the box, the better the homogeneity and effect of plasma cleaning treatment. 2. Size of spacing: The distance mainly refers to the distance between each layer of copper lead frame. The smaller the distance, the worse the effect and uniformity of plasma cleaning copper lead frame will be. 3. slot characteristics: Put copper wire skeleton inside material box to undertake plasma cleaning processing, if all around did not open groove, can form block, plasma enters hard, affect processing effect, what need at the same time is shield action, the position of slot, slot size. In addition, whether the cover of the material box should be covered, as well as the time of the cover, these will affect the cleaning effect of surface plasma treatment.

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Whether the plasma processing system equipment needs regular inspection

Whether the plasma processing system equipment needs regular inspection

Once, a customer who had bought our plasma system equipment called me out of the box and asked if it needed regular maintenance. Generally speaking, when the new machine is just bought back, the first few years are relatively stable, as long as the operation process is normal, basically the machine will not have any problems, but also depends on the size of the workload, how to use frequency. As now more popular family car, according to the driving time and miles to determine whether the need for maintenance, but also to look at the road conditions and load. CRF is very professional in plasma treatment system equipment, and has strict control over the procurement of raw materials and accessories, as well as the assembly and manufacturing process in each process. In addition to the perfect sales and after-sales team, you can rest assured to buy. And our specifications are complete, including: plasma processing equipment, atmospheric pressure plasma surface treatment equipment, wide plasma cleaning equipment, vacuum plasma cleaning equipment, whether domestic, can meet your requirements or imported, independent research and development a complete set of plasma processing system equipment. With the development of the society and the improvement of the industry, as well as the market demand, the software and hardware facilities should also keep pace with The Times, looking forward to more high-quality good machines to serve new and old customers.

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Influence of plasma surface treatment on sensing performance of flexible conductive fiber

Influence of plasma surface treatment on sensing performance of flexible conductive fiber

PPY (polypyrrole) is a kind of polymer material, with high conductivity, good environmental stability and less toxicity, due to its brittleness, so it is difficult to be processed and directly applied. PPY-coated XLA fibers, due to their strain sensitivity, can be used as a flexible sensor under large strain conditions. But because XLA fibers have a very smooth surface, they require special treatment before they can be coated with conventional chemical vapor deposition. Influence of plasma surface treatment on sensing performance of flexible conductive fiber Plasma treatment can change the surface roughness of fiber. It makes PPY more easily attached to the fiber surface and increases its contact strength with the fiber. The mechanical and strain sensing properties of the conductive XLA fibers treated with different plasma treatment times (5 and 15 min) were compared. Plasma treatment has little effect on the mechanical properties of the fibers, but has great effect on the strain sensing properties of the conductive fibers. Conductive fibers include fibers that conduct electricity themselves or insulating fibers with conductive coatings. Because the conductive fiber itself is flexible and conductive properties. As a kind of sensing material, more and more attention has been paid. Micro/nano scale of PPy apply high elastic fabric surface, because the coating and the body's two materials elastic modulus of the larger differences, PPy under the condition of large strain can produce many micro/nano scales on the fiber surface of small crack, resulting in obvious changes in resistance of the conductive fiber, thus can be applied to flexible perception of large strain sensor. Plasma ionization of "gas", it presents a highly stimulating the unstable state, gas internal charged particles accelerated motion, collision, energy transmission, ionization, discharge to produce ultraviolet, visible light, such as, excitation of the particles, can and the surrounding material produces chemical reaction, some reaction is almost cannot occur under normal conditions, Therefore, plasma has special processing effect. The treatment process is to produce plasma from inert gas or oxygen-containing gas by means of discharge, high-frequency electromagnetic oscillation, shock and high-energy radiation. After plasma treatment, the originally smooth fiber surface was etched uneven, increasing the roughness of the fiber surface, so that the originally smooth XLA fiber is easier to combine with the PPy coating.

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