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The foreword
photo-curing coating mainly refers to a new type of coating that is rapidly cross-linked cured into film under ultraviolet light exposure, because of its high-efficiency coating curing and environment-friendly characteristics, has been recognized by the world paint industry and the vast majority of regulatory agencies. UV coatings have the advantages of non-volatile organic compounds, fast curing speed, small environmental pollution and good curing product performance.
introduction to UV coatings
UV curing principle:
adds a light trigger (or photosensitive) to a specially formulated resin, which, after absorbing high-intensity ultraviolet light from ultraviolet (UV) photo-curing equipment, produces active freelance, which triggers polymerization, crosslinking and thing reactions that convert the resin from liquid to solid
China
in seconds.the composition of
UV coatings
light trigger
is a key component of the photo-curing system, its role is to transmit the energy of ultraviolet photons, quickly trigger the cross-linking polymerization of monomers and polymers, and promote the system's liquid-solid conversion process. According to the triggering agent, the light trigger can be divided into free-based and cation two types.
oligomers
also known as oligopolymers, also known as prepolymers. It is a base resin of light curing formula, which constitutes the basic skeleton of curing products and gives the basic properties of the cured products. For example: hardness, flexibility, adhesion, optical properties, aging resistance, etc.
main function of
of the active thinner is to dissolve the solid parts in the UV coating and regulate the viscosity of the system. Thinners in UV coatings are not volatile organic solvents used in general coatings, but non-volatile solvents that are directly involved in the curing film process. Active thinner in terms of chemical structure, is generally a molecular weight is not large and the molecule contains a class of polymerable energy groups of monosomes, into a film to become part of the paint film.
Other raw materials (additives)
to meet specific use requirements, improve the performance of the paint film to add certain auxiliary components, such as leveling agents, desiccants, substrate lubricants, anti-lighting agents, wetting dispersants, stabilizers, surface smoothing agents.
UV coating performance
characteristics
fast curing speed
UV coating under the action of ultraviolet light only about a second to cure, can continue to fast operation, greatly improve the efficiency of production.
energy savings
no need to heat and dry during construction, saving 75% to 90% of energy compared to conventional thermal drying coatings.
environmental protection
its essence is basically no solvent addition, in the process of film-forming, there is no VOC volatile into the air, so there will be no pollution to the environment.
low investment cost of equipment
simple, easy to repair, small footprint, low investment in equipment ...
Performance
adhesion
are the most basic and important requirements for any UV coating application. For plastic substrates, the difference in surface properties directly affects the adhesion of UV coatings. It is generally necessary to take into account the properties of these plastic substrates: polar size, crystallization, thermoplastic or thermosolytic properties, and surface pressure. From the UV coating formulation considerations, there are generally three factors can improve the adhesion to the plastic substrate. First, to reduce the surface pressure of liquid coatings, improve the wetting effect of liquid coatings on substrates;
the properties of the car (e.g. softness/hardness/wear resistance/scratch resistance, etc.)
The nature of UV coating film affects the final properties of UV coatings and the protection of substrates. By understanding the basic properties of UV resins and UV monosomes, preparations can be made.
chemical properties (e.g. water resistance/acid/alkali resistance/chemical resistance) are
UV resin and monosome, as the main film-forming substances of UV coatings, have an important influence on the chemical properties of UV coatings.
weather-resistant nature
The weather-resistant properties of UV coatings generally refer to the use of UV coatings in the process of resistance to nature's ultraviolet rays, heat, water, oxygen and chemical damage. Common test indicators include changes in the gloss of the paint film, changes in the color of the paint film, and changes in the performance of the paint film.
end of the
UV curing coating is a kind of energy-efficient and environmental protection coating, coating film has excellent performance, is further expanding to the traditional coating application areas, with the in-depth research in the industry has great potential for development.