Ultraviolet curing process of Shenzhen Blue Spectrum Rick Technology Co., Ltd. has been used in the UV metal coating industry for more than 25 years. It has a large number of R&D teams, carefully designed customized products, and has achieved various fields such as metal coating and curing. Ultraviolet UV LED curing technology is used to make the production faster, more convenient, more environmentally friendly and efficient.
UV vacuum plating coating is mainly composed of UV curing resin, monomer, photoinitiator, color, leveling agent and adhesion promoter. According to the division of application, it is mainly composed of UV vacuum plating primer and UV vacuum plating top coat. In order to match the new modern plating technology, some coatings are added in vacuum plating.
The role of primer UV vacuum coating primer is coated on the surface of plastic substrates, its role is to seal the plastic substrates, to prevent the volatile substances in the substrates from affecting the quality of the coating. Plastic surface is rough, smooth and smooth mirror effect can be obtained by primer coating, which is conducive to obtaining thicker and uniform vacuum metal coating, showing higher metal luster and reflective effect. For some substrates with lower polarity, better adhesion of vacuum plated metal coatings can be obtained by primer transition. Primer also plays a certain role of thermal buffer for some plastic substrates with poor heat resistance.
The requirement of primer for UV vacuum plating coatings requires that primer must have good adhesion to plastic substrates and vacuum coated metal layers, that is to say, coatings should not only adhere well to weak polar plastic substrates, but also have good adhesion to polar metals, which is more than the requirement of pure plastic coatings. Higher, also indirectly proves that most of the UV vacuum plating resins are equally applicable or higher than the simple UV plastic coatings.
At the same time, in order to ensure the high gloss and mirror effect of metal coating, primer must have excellent leveling performance. In addition, there should be no volatile small molecule after primer solidification, otherwise the quality and performance of metal coating will be destroyed, so the high molecular weight of primer formulation is also an important consideration. For some heat-resistant base materials, UV primer with its heat resistance is also very important, such as BMC heat resistance requirements to 180 degrees.
In addition, in order to prevent the cracking or bursting of the coating, the flexibility of the primer system is particularly important.
According to the performance requirements of UV vacuum coating primer, the formulation of primer should fully consider flexibility, leveling, adhesion and molecular weight when choosing oligomers. Therefore, considering these needs, polyurethane acrylic resins with two or three functions are generally chosen as the main resins, such as 615, which is popular in the market. 8 and UA202. Considering the cost and performance factors, epoxy resin or polyester are usually selected to be used together. The monomer usually takes TP as the priority, the initiator is the first choice for non-long wavelength, and the appropriate amount of phosphate ester and adhesion promoter can be added as appropriate.
The function and requirement of topcoat is that UV vacuum electroplating topcoat is coated on vacuum coated metal, which plays a protective role and a certain decorative role in the coating. Therefore, topcoat requires good adhesion to the metal coating, and has enough performance to resist external friction, scratch, scratch and other external forces, and to provide a certain degree of resistance and barrier. In addition, most topcoats or mid-coatings need color modification, and the wettability requirements of pigments and fillers in the whole paint system are very high.
The formulation design of the top coat is different from that of the primer. In order to ensure the mechanical properties of the coatings, the resin with higher functionality is usually used to match the top coat. In addition, taking full account of the additivity, some ultra-high functionality resins are allowed to be added to improve the wear resistance. In addition, in order to ensure the addition of the pigments in the system, some super-high functionality resins are allowed to be added. Convenient, good moisturizing properties of resin is also preferred, such as imported Changxing Chemistry 6071 and domestic 1000chen material UA378, Europe and the United States also have a good choice of materials. As for additives, on the premise of guaranteeing performance, a small amount of HEMA auxiliary performance can be selected.