Plasma surface activation/cleaning; plasma etching/activation; plasma de-gumming; plasma coating (hydrophilic, hydrophobic); enhancement of bonding; plasma ashing and surface modification of large-scale production occasions, through its treatment, can improve the material surface wetting ability, so that a wide range of materials to be able to Coating, plating and other operations to enhance adhesion, bonding, while removing organic pollutants, oil or grease.
The reason why the plasma cleaner can produce the above effects, all rely on the magic of plasma in which plays a vital role.
Plasma and workpiece surface chemical reaction and conventional chemical reaction is very different, due to high-speed electron bombardment, a lot of gas or vapor at room temperature is very stable can be in the form of plasma and the workpiece surface reaction, resulting in a number of strange, useful effects;
Cleaning and etching:
For example, in the cleaning, the gas is often used to work with the Oxygen, which is accelerated by the bombardment of electrons into oxygen ions, free radicals, oxidizing extremely strong. Contaminants on the surface of the workpiece, such as grease, flux, photographic film, mold release agent, punch oil, etc., will soon be oxidized into carbon dioxide and water, while being pumped away by the vacuum pump, so as to achieve the purpose of cleaning the surface and improving the wettability and adhesion. Low-temperature plasma treatment involves only the surface of the material and does not affect the nature of the main body of the material. Since plasma cleaning is carried out in a high vacuum, the free range of the various active ions in the plasma is very long, and their penetration and permeability are so strong that treatment of complex structures, including fine tubes and blind holes, can be carried out.
Introduction of functional groups:
Polymer materials treated by plasma with gases such as N2, NH3, O2, SO2, etc., can change the chemical composition of the surface and introduce corresponding new functional groups: -NH2, -OH, -COOH, -SO3H and so on. These functional groups can make polyethylene, polypropylene, polystyrene, polytetrafluoroethylene, etc. These completely inert substrates become functional materials, which can improve the surface polarity, wettability, bondability, reactivity, and greatly improve their use value. Contrary to oxygen plasma, low-temperature plasma treatment with fluorine-containing gas introduces fluorine atoms to the surface of the substrate, making the substrate hydrophobic.
Polymerization:
Many vinyl monomers, such as ethylene, styrene, can be polymerized on the surface of the workpiece under plasma conditions without any other catalysts or initiators, and even methane, ethane, benzene, which can not be polymerized under the conventional polymerization conditions, can be crosslinked and polymerized on the surface of the workpiece under plasma conditions. The polymerized layer can be very dense, and the combination with the substrate is very strong. In foreign countries, plastic beer bottles and automobile fuel tanks on the use of plasma polymerization on such a layer of dense layer, to prevent trace leakage. The surface of polymer biomedical materials can also be through this dense layer to prevent the plastic plasticizer and other toxic substances to human tissue diffusion. Optical components can often be added to the surface by plasma polymerization.