Rapid curing coating applicable to UV-LED (Ultraviolet-Light-Emitting Diode) light source and preparation method thereof

Abstract

The invention discloses a rapid curing coating applicable to a UV-LED (Ultraviolet-Light-Emitting Diode) light source. The coating comprises the following components in percentage by weight: 4-10 percent of a photoinitiator, 20-60 percent of a special oligopolymer, 10-50 percent of an active diluent, 6-12 percent of a promoter, 0.1-2 percent of an aid and 0-30 percent of a pigment. The rapid curing coating applicable to the UV-LED light source can be prepared by slowly stirring and mixing the components uniformly in sequence under the condition that sunlight or ultraviolet light irradiation is avoided and the relative air humidity is less than 70 percent, and keeping the temperature of a mixture below 50 DEG C in a stirring process. The rapid curing coating can be cured rapidly under low UV light intensity and energy, and has the characteristics of high luster, high adhesion and high wear resistance; the production efficiency of UV-LED photo-curing is increased to a great degree; and a highly-environmentally-friendly and highly-energy-saving UV-LED photo-curing technology is applied widely.

Description

technical field [0001] The invention relates to a coating that can be used for fast curing of UV-LED light sources, in particular to a photocurable coating that can be used for printing. Background technique [0002] At present, the UV light curing process used in the printing industry mainly uses high-pressure mercury lamps and metal halide lamps as light sources and then mixes curable coatings. Its disadvantages are large power consumption and high heat generation, which will cause damage to printing presses and substrates, and ozone will be generated during use. Emphasizing environmental protection is a common trend of social development. In the United States, Germany, Japan, Italy and many other countries, legislation has been passed to restrict the use of traditional coatings with high VOC (volatile organic compound) emissions, and gradually replace traditional coatings with environmentally friendly new materials such as UV coatings. product. On the other hand, due to...

AI Technical Summary

Problems solved by technology

[0003] Although photocuring has so many advantages, since the current photocuring coatings use high-pressure mercury lamps or metal halide lamps, these traditional UV lamps also have many shortcomings and deficiencies.

The energy efficiency of the high-pressure mercury lamp is low. Due to the short curing time, the input power of the ultraviolet bulb is large, and the output power of the ultraviolet light is small, so a large amount of heat energy is lost.

Generally, in the power of ultraviolet light bulbs, only 20% of the power is converted into ultraviolet rays, visible light accounts for 10%, and infrared rays and heat energy account for 70%. The temperature of the tube wall of a general mercury lamp can reach about 600°C; The printing of printing materials with poor heat resistance and the thermal influence of the printing machine will often cause deformation and damage to the substrate; the high-pressure mercury lamp has a short service time, generally 2000-3000 hours at most, and the amount of ultraviolet rays will increase when it is close to the later stage. Reduced by 15-20%, so the reflector needs to be cleaned regularly, and the equipment needs to be replaced and maintained frequently, which increases the cost of use; the ozone generated by the high-pressure mercury lamp will corrode the surrounding equipment, and the ozone will also have a negative impact on the human respiratory system , and the high-pressure mercury lamp contains mercury, which will pollute the environment