The principle of plasma surface treatment

Plasma, the fourth state of matter, is an ionized gaseous matter consisting of atoms deprived of part of their electrons and positive and negative electrons generated after atoms are ionized. Its energy range is higher than that of gaseous, liquid and solid substances. There are electrons, ions and neutral particles with a certain energy distribution. When they collide with the surface of the material, they will transfer their energy to the molecules and atoms on the surface of the material, resulting in A series of physical and chemical processes. Its function on the surface of the object can realize the ultra-clean cleaning of the object, the activation of the object surface, the etching, the finishing and the plasma surface coating.

(1) Etching on the surface of the material

Physical action A large number of ions, excited molecules, free radicals and other active particles in the plasma act on the surface of the solid sample to remove the original contaminants and impurities on the surface, and will cause etching to remove the sample. The surface becomes rough and many fine pits are formed, which increases the specific surface area of the sample. Improves wetting properties of solid surfaces.

(2) Activation bond energy, cross-linking effect

The particle energy in the plasma particle is 0~20eV, and most of the bond energy in the polymer is 0~10eV, so after the plasma acts on the solid surface, the original chemical bond on the solid surface can be broken, and the plasma These bonds in the free radicals form a network-like cross-linked structure, which greatly activates the surface activity.

(3) Formation of new functional groups

Chemical action If a reactive gas is introduced into the discharge gas, a complex chemical reaction will occur on the surface of the activated material, and new functional groups, such as hydrocarbon groups, amino groups, carboxyl groups, etc., are introduced. These functional groups are active groups, which can significantly improve the answer. Material surface activity.

Technology and Application of Plasma Surface Treatment

For the surface cleaning of the plasma surface treatment technology, the release agent and additives on the surface can be removed, and the activation process can ensure the quality of the subsequent bonding process and coating process. For coating treatment, The surface properties of the composite can then be further improved. Using this plasma technology, materials can be efficiently surface pretreated according to specific process requirements.

Plasma surface treatment technology can be applied to various industries, such as rubber and plastics industry, automotive electronics industry, defense industry, medical industry, aviation industry and so on.

Plasma surface treatment technology also has the following advantages:

1. Environmental protection technology: The process of plasma surface treatment is a gas-solid phase dry reaction, which does not consume water resources and does not need to add chemicals.

2. High efficiency: the whole process can be completed in a short time

3. Low cost: the device is simple, easy to operate and maintain, a small amount of gas replaces the expensive cleaning liquid, and there is no cost for treating waste liquid

4. Finer processing: able to penetrate into the interior of microscopic holes and depressions and complete cleaning tasks

5. Wide applicability: Plasma surface treatment technology can realize the treatment of most solid substances, so the application field is very wide

Variations in Plasma Surface Treatment

The surface treated by plasma technology, whether it is plastic, metal or glass, can improve the surface energy. Through such a treatment process, the surface state of the product can fully meet the requirements of subsequent coating, bonding and other processes. Plasma surface treatment in the printing and packaging industry can greatly improve the bonding strength, reduce costs, stable bonding quality, good product consistency, no dust, and clean environment.

How long does plasma surface treatment take to fail?

For the plasma treatment time, the cross-linking, chemical modification and etching of the plasma-treated polymer surface are mainly due to the fact that the plasma makes the polymer surface molecules break bonds and generate a large number of free radicals. The experiment shows that with the prolongation of the plasma treatment time and the increase of the discharge power, the strength of the free radicals generated increases, and it enters a dynamic equilibrium after reaching the maximum point; The low temperature plasma reacts to the deepest extent on the polymer surface under certain conditions.

After plasma surface treatment, it may be due to the properties of the material itself, secondary pollution after treatment, and chemical reactions, etc., and the time that the surface can be retained after treatment is not easy to determine. After the plasma surface treatment reaches a higher surface, the next process is immediately carried out to avoid the influence of surface energy attenuation.