Vacuum coating technology advantage in where?

                Vacuum coating technology advantage in where?

Vacuum coating technology advantage in where? Vacuum coating technology of the most widely used in plastic products, vacuum coating factory said the plastic is easy molding, low cost, light weight, no corrosion and other characteristics, widely used plastic products, but because of its disadvantages restricted the expanded application. Through the application of vacuum coating technology, plastic surface metallization, combine organic materials and inorganic materials, greatly improved its physical and chemical properties. Vacuum coating technology advantage is mainly embodied in the following aspects:
1, make plastic surface conductivity;
2, easy to clean, no dust.
3, improve beautiful, smooth surface, the metallic color, adornment sex is greatly improved;
4, reduce water absorption, the larger the number of coating, the less pinhole, bibulous rate is lower, the product is not easy to deformation, improve the heat resistance;
5, improve surface hardness, the original plastic surface than metal soft and vulnerable, through vacuum coating technology, hardness and wear resistance increase greatly;
6, can improve the weatherability, general plastic outside can aging fast, the main reason is caused by ultraviolet irradiation, and after plating aluminum, aluminum with ultraviolet the strongest reflection, so the weather is greatly increased.

Progress in Surface Modification Technology

   

 With the development of scientific and technological progress and the edge of science and technology areas covered surface modification technology "vacuum c​oating" continues to extend and expand. Traditional carburizing, nitriding and other chemical treatment technology has become a fundamental part of surface modification technologies; ion implantation technology, laser and electron beam technology in surface modification of materials, for parts of the surface hardening and surface alloying offers new technology and methods.

(1) Salt Nitrocarburizing technology (TUFFTRIDE QPQ). TUFFTRIDE QPQ process is the part after a simple pre-washed and pre-heated to the air after 350 ~ 400 ℃, the alkali cyanate tank for Nitrocarburizing usually treatment temperature is 580 ℃, maintain 60 ~ 120min, special when the case can be reduced or elevated temperatures. Cold treatment using an oxidation at the cooling tank, at a temperature range of 350 ~ 400 ℃ cooling, followed by hot water jet cleaning of the workpiece. In addition to cooling slowly cooling oxidation, good for dimensionally stable parts, but also has the following advantages:

① significantly improved the corrosion resistance of parts;

② parts of the surface in the base product to produce cyanate tank oxide film;

③ better sliding properties.

(2) ion nitriding "multi-arc ion vacuum coating"gas phase analysis and application. In the plasma nitriding process, in addition to temperature and time, furnace gas composition is an important factor in determining the quality of the nitrided layer. Element N, H ratio changes significantly affect the structure of the compound, and the influence of hardness of the diffusion layer to some extent. In addition, the ion nitrocarburizing process, the compound layer is a dense, e single-phase layer can form, furnace gas composition is a decisive factor. Typically by controlling the furnace atmosphere into the nitriding furnace gas flow rate is set, but the actual flow rates at different points of the same partial pressure of the gas is often quite different, resulting in factors such differences are: from gas means a chemical reaction to occur at gas path characteristic nitriding furnace, the speed of change and the like inflatable gas ions between different conditions and the like.

Technical requirements UV lamp vacuum coating paint

Vacuum coating due to radiation-curable coatings green and high efficiency, makes the technology in the world gained widespread attention and rapid growth, its applications more widely. UV coating layer having excellent surface smoothness, is suitable as a primer for the vacuum metal coating technology, available very bright metal appearance on the plastic substrate.

With the development of the automobile industry, many metal replacement technology has been applied, the current car headlight reflector applications, has been fully adopted in the PC, BMC and other plastic surface by vacuum metallized to increase the reflection effect for this area the UV coating requires a good leveling, high temperature resistance (for PC substrates require more than 120 ℃, BMC substrates up to 180 ℃)....

In the design of PC reflector headlights when using UV primer, pay attention to increase the crosslink density coating the coating to ensure a good closure, by adjusting the ratio of reactive diluent formulations to the coating and the substrate, adhesion between the coating and the coating to achieve the best, the complex structure of the workpiece, pay special attention to ensure that the site is not sufficient UV radiation can be completely cured. The main reason for the vacuum coating UV primer requirements before vacuum coating to a plastic substrate surface UV coating has the following two points:

First, when the base is closed by UV coating, vacuum coating, or prevent the use of the escape of volatile impurities in the substrate workpiece, affect coating quality. Like when the lamp reflector applications, due to the use of the process temperature rises above 100 ℃, if volatile impurities in the substrate will release the aluminum layer hair color, color, affect the reflection effect. Figure 1 (omitted) for the DSC curve PC plastic, this figure shows the PC when the substrate has a temperature of about 90 ℃ significant heat flux, may be considered material to release a glass transition temperature Tg of about 140 ℃, the material use temperature should be below this temperature.

Second, to improve the flatness of the substrate surface, ensure the coating mirror effect. Generally plastic surface roughness 0.51nn around itself, vacuum coating thickness does not exceed 0.2μm, was unable to fill the uneven surface of the substrate, are not ideal mirror effect, UV coating thickness of 10-20μm, surface flatness 0.1μm or less, you can fill the substrate coating defects and get the desired effect. For PC material headlight reflector of UV coating must have the following basic characteristics:

(1) leveling state is good, bright paint film, so you can make sure that there is a complete vacuum coating of reflective film.

(2) coating with seal action, ensures the escape of PC substrate does not affect the coating composition at 120 ℃ time.

(3) the coating itself has a certain heat resistance, 120 ℃ will not have material effect on the decomposition release coating.