Plastic vacuum coating technology
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definition Plating of vacuum
A process by which metals, metallic compounds, or other sickle materials are deposited on the surface of a substrate under vacuum to form a thin film. The adornment method of this kind of surface can make plastic surface forms the plating film layer of a brightness, be helpful for again make its undertake the spraying of all sorts of coating, and have match colors convenient, adornment the characteristic with good effect, get plastic to decorate the general attention of the industry.
Type Plating of vacuum on Plastics
The main types of plastic vacuum coating
1. evaporation coating method
2. Magnetron sputtering coating method:
3. Ion coating method.
Evaporation coating process
Here referred to as evaporation coating
It is heated in the vacuum of 1.3 10-2~ 1.3 10-3pa to make the coating material evaporate in a very short time, and the evaporated coating material molecules are deposited on the plastic surface to form the coating layer.
Also called high speed low temperature sputtering method
It is about 1. 3x 10-1pa in the vacuum filled with emotional gas, and in the plastic substrate (anode) and metal target (cathode) between the high voltage direct current, due to glow discharge generated by electronic excitation inert gas, plasma. The plasma knocks out the atoms of the metal target and deposits them on the plastic substrate.
Comparison between magnetron splash and evaporation coating methods
Magnetron sputtering has the advantages of strong adhesion between coating and substrate, uniform and compact coating. At present, magnetron sputtering has been widely used in the fields of electrical film and plastic metallization. In general, magnetron sputtering coating has higher adhesion than vacuum coating, but evaporation coating has higher production efficiency and lower production cost than sputtering coating. In general, according to the use of different methods to choose coating. The general magnetic decoration coating machine can be plated brass film, red copper film and stainless steel film, and by the magnetic decoration coating machine structure restrictions, generally can only be plated small crafts or decorative pieces. For large size or large area of plastic parts of the decoration, the general use of box evaporation coating machine.
Ion coating process
The technique is very similar to evaporation coating except that in the vacuum of 3x 10-2"1. 3x 10-4pa the ion coating is used to make the accelerating ions collide with the metal and the released metal atoms adhere to the plastic surface under the action of reaction force. Because the energy of metal atom is lower than that of evaporation, even the plastic with poor heat resistance can generate metal film with good stability on its surface. In addition, the metal film with high melting point of alloy can be formed. But because large intermediate electrodes are needed, examples of high-value metals such as gold plated with ions and silver are rare. If you want to economically get the same look as gold.
Can use the method of surface besmear, besmear on plating aluminous film namely yellow and transparent coating, can get the appearance like gold, price is low, still can protect coating film, prevent damage or peel.
Principle of vacuum coating of plastics
Vacuum coating is to use the principle of vapor deposition, in a vacuum environment, through a variety of evaporation, sputtering, ion bombardment and other methods to make the film material on the surface of the workpiece deposition and get the required film, belongs to dry film forming technology.
Vacuum coating of plastics is compared with electroplating
The main advantages are that there are many kinds of materials and colors that can be plated into the film layer, the deposition process is easy to operate, the composition of the film layer is easy to control, the film thickness is uniform, the pretreatment of the substrate is simple, the production efficiency is high, and the production cost is low, and the pollution of waste water, waste gas and waste residue is low, which is easy to industrial production. In addition, because the coating material is basically reached in the atomic state and deposited on the surface of the plating part, a continuous bright metal film layer is formed, which can be sealed and protected to ensure that it is always bright as new and endow it with certain functions, such as the currently popular gold TiN superhard film and light gold ZrN superhard film.Black superhard film, chromium superhard film, insulating film, conductive film, electrothermal film, color film, etc.
Vacuum coating material for plastics and its selection method
Coating material selection:
Different coating materials, their properties are different, according to the use of different choice of suitable coating materials. Different coating materials, the plating process is different,0 even if the same coating material, in different plastic substrate on its performance, there are differences. Therefore, in the vacuum coating, should be based on the use of plastic and specific coating methods to choose coating materials. Nickel-chromium alloy film. Ni-cr alloy film is white and blue, the color is like stainless steel, the texture is steady and dignified, the decoration effect is unique, suitable for the decoration of people or animals. As the evaporation temperature of the ni-cr alloy wire is obviously higher than that of aluminum, it is recommended to select a larger operating current of 50A and a working vacuum degree (3~4) 10-2pa, and the operation process is the same as above. Membrane layer thickness
Degree directly by how much to adjust the plating, that is, when the film is thicker, evaporation by plating.