UV LED curing technology and resin introduction

In recent years, UV LED curing technology has received great attention from all over the world, and UV LED light sources have been gradually replaced by traditional mercury light sources in many applications. UV LEDs are electroluminescent diodes that are more environmentally friendly, efficient and low-energy than conventional UV mercury lamps and are truly sustainable green industrial technologies.
UV LED features
single wavelength, high luminous efficiency, low energy consumption
UV LED can directly convert electrical energy into UV light, and emits a single-band ultraviolet light, light energy is highly concentrated in a specific ultraviolet band, now there are mature applications in the market is 365nm, 385nm, 405nm these bands

. The emission spectrum of traditional UV mercury lamps is very wide, and the ultraviolet spectral segment, which really cures effectively, is only a part of it, while the photoelectrulation conversion efficiency is low and the energy consumption is large.
does not produce infrared and ozone
traditional mercury lamps produce infrared light and emit a lot of heat, which can easily cause damage to thermally sensitive substrates. The UV LED is a cold light source, which can effectively avoid the shrinkage deformation of the substrate due to overheating, and is more adaptable to the material. UV LEDs used for UV curing at the same time are usually UV light with longer wavelengths, so ozone is not produced during the curing process, maintaining a good working environment and making them safer and more environmentally friendly than conventional mercury lamps.
is lit, electronic control is
.UV LEDs do not need to be warmed up like mercury lamps, nor do they need to be kept on in order to maintain lamp life and productivity. UV LEDs can instantly turn on (off) lights, the output energy can also be set freely, and can be random speed and automatic adjustment, very energy-saving, easy to control.
long service life and low maintenance
.LED UV lamp service life of more than 10,000-50,000 hours, more than 10 times the traditional mercury lamp, and light attenuation is very slow, service life is not affected by the number of switches. At the same time, LED light sources have no mercury, no accessories such as lampshades, so there is little maintenance required, reducing maintenance costs.
use flexibility, the system size is
.LED light source can be divided into point light source, line light source, surface light source, can be customized effective irradiation area. Light source equipment size is small, the irradiation device and related supporting devices are very compact, no need for the previous kind of large mechanical installation space and pipe construction. This feature enables it to adapt to a wide range of production processes, which are also more efficient.
sales of UV LEDs compared to traditional UV mercury lamp equipment in 2011-2016
. UV LED Market and Prospects
According to TechNavio, the UV LED market has been growing at a very high rate for the last seven or eight years, from $20 million in 2008 to $90 million in 2014, with a compound annual growth rate of 28.5%. In 2016, due to the active introduction of ultraviolet LED products to the light curing, sterilization and purification market and other applications, the estimated output value will reach 166 million U.S. dollars, of which LED used in the light curing market value will reach 81 million U.S. dollars. By 2020, the global UV LED technology market will grow at a compound annual rate of 39%.
2015, the UV curing market accounted for 48.14% of the UV LED technology market. Increased demand for UV LED curing equipment in the printing industry, and significant improvements in fluve density for UV LED chips have led to UV CURing taking up a large part of the UV LED technology market. At the same time, printing has developed into a major user of LED curing equipment. UV LED technology has been a great success in the field of inkjet, driving the application of UV LED technology throughout the printing industry.
UV LED technology in the Asian
.TechNavio predicts that the UV LED technology market in the Asia-Pacific region will grow the fastest in the future, with UV LED technology growing at a compound annual rate of 39.31% in the Asia-Pacific region. This is mainly due to the high demand for UV curing equipment and technology in the region. China and India are emerging markets, and these policies encourage UV LED manufacturers to increase production of UV LEDs as governments advocate for energy-efficient light sources and support controls in the industrial, medical and scientific sectors. LED light curing applications are currently mainly concentrated in wood, ink and UV glue three areas, in the next few years there will be a larger increase.
UV LED technology for the European market
UV LED technology for Europe will grow from $36.28 million in 2015 to $190.2 million in 2020. Environmental regulation of hazardous substances and a ban on mercury lamps in Europe have made the European market a major enabler of revenues in the global UV LED market. Due to the environmentally friendly UV LEDs and low power consumption, there are a large number of applications in the medical, adhesive, print curing market in Europe, which have also become a major factor in the growth of the European market.
UV LED technology in the North American
.UV LED technology accounts for 26.8% of the North American market share. TechNavio predicts that the North American UV LED technology market will grow from $34.33 million in 2015 to $179.06 million in 2020. Due to rapid market growth, the graphic arts industry in North America is increasingly using UV curing equipment and technology. Other UV LED photo-curing applications involve the healthcare industry, communications equipment industry, automotive industry, building materials industry and so on.
UV LED resin
because UV LED is a single band of UV light source, trigger absorption spectrum needs to match the LED emission spectrum, the current market for LED light source development of the trigger is not much, mass production is even less. Therefore, the problem of trigger matching has always been the difficulty of LED light curing, the current use of light triggers are TPO, TPO-L, ITX, DETX, BAPO and so on. These triggers in the 365nm, 385nm, 395nm, 405nm band does not have a very strong absorption peak, so the trigger efficiency is not high. At the same time, compared with the traditional mercury lamp, its power is low, irradiated energy is not high, especially ink-type colored system, if the printing speed is too fast, easy to lead to ink curing is not complete
At present, there are very few UV LED curing resins available in the market, which are mainly subject to the two major problems of reaction activity and stability.the balance ofcuring speed, anti-surface oxygen impedance and storage stability
curing speed, anti-surface oxygen impedance and storage stability are three important aspects of UV photo-curing technology, which is relatively easy to achieve alone, but it is very difficult to take into account all three. Through a lot of experimental work, the researchers of Runao Chemical have changed the resin structure by innovative method, and adopted auxiliary means, and developed three UV LED curing resins with different application systems, which perfectly achieve the balance of curing speed, anti-surface oxygen impedance and storage stability, thus solving the practical application problem well.
the direction of wood and plastic
.FSP8370 is a four-function special modified polyester acrylic, specially developed and applied to LED wood and plastic coatings. The resin has high low energy curing speed, high conversion rate, high hardness, excellent wear resistance and water cooking resistance. In the experiment, the 395nm point light source with light strength of only 200mw/cm2 was irradiated for 10 seconds to dry out. The FSP8370 not only has outstanding reaction activity, but also excellent storage stability. In the formula with the trigger, put in the oven at 60 degrees C for 2 weeks, the viscosity is basically unchanged, the thermal stability is excellent.
UV glue direction
.FSP8672 is a two-function polyurethane acrylic, specially developed for UV-LED adhesive system. The resin has a high reaction activity under the LED light source, good cohesion, tension strength up to 32MPa, has excellent deep curing performance, suitable for drip glue, black glue, such as curing, high strength requirements of the UV glue system.direction
FSP5708 is a two-function adipose family polyurethane acrylic, specially developed and applied to UV-LED flexo printing, gravate ink system. The resin has low viscosity, fast curing speed, good toughness, excellent pigment wetting, good adhesion to most plastic substrates, suitable for a variety of substrates.
application of UV LEDs in light curing
. UV inkjet
currently, the market attention to UV LED curing technology is very high, of which the field of inkjet innovation is the most, and UV LED curing advantages just meet the needs of this field.
advantages of UV LED inkjet: energy saving, high efficiency, high resolution, adapt to a variety of substrates. Applications: industrial or decorative printing, large-face inkjet printing, labeling and packaging printing.
UV offset
.LED UV offset printing compared with ordinary UV printing, in the entire printing production process, more energy-saving and environmental protection, long life, can reduce energy consumption of up to 70 to 80%, and the printing material has outstanding adaptability.
PCB industry
components (capacitors, inductances, various plug-ins, screws, chips, etc.) fixed.
moisture-proof potted and core circuits, chip protection, antioxidant coating protection.
board-protected (angle) coating.
ground, flyline, coil fixed.
wave wave weld through hole mask.
Wood industry
compared with traditional coating methods, UV LEDs will not affect the moisture content of substrates, and from the closed base, primer, finish, paint to achieve a comprehensive UV LED rapid curing construction process, eliminating the traditional wood bottom, paint long drying and curing time and low solidity multi-channel spraying construction of the complex process, can achieve the whole line of mechanization, assembly line operation, for the factory production capacity has a great role in promoting.
UV Adhesive
uses UV LED curing glue with many advantages, such as low heat release, lower energy demand, saving curing time and position, increasing productivity and making automation easier. Therefore, it is widely used in the microelectronics industry and medical device field, play a bonding, fixing, protection and other roles.
UV meth adhesive
using low-power LED lamp curing, low heating process, UV meth adhesive curing effect is good, can be kept as bright as new for a long time.
UV paint
. LED advantages: cold light source, less pollution, fast curing, low energy consumption, film-forming performance is superior.
applications: mobile phones, automotive coatings, optical lenses, plastic coatings, fiber optic coatings.
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