Excellent toughness antioxidant polymer resin - LuCure5186.

Mercury lamps are most commonly used in photocuring systems, but with the advance of the Minamata Convention, many UV applications are now using new UV LED curing. However, the most important problem with the use of LED light source is that the match between the absorption peak and the wavelength of the light source is not high, the resulting free-form is less, and the surface of the paint film is easily affected by oxygen impedance, which leads to the problem of poor table dryness.
generally for paint film in low-energy curing or LED light source under the table dry problem, will use nitrogen protection, increase the amount of trigger added, the use of active amine or thiol products and other methods

. The above method has certain limitations and disadvantages, such as nitrogen protection on the production line has certain requirements, while increasing construction costs, and the addition of additional triggers will also lead to an increase in formulation costs, ordinary active amine products have a clear amine taste, yellowing, flexibility in general, thiol products smell large, easy to directly and resin or monomer addition reaction, resulting in storage stability problems.
, the company introduced two amine-modified resins, LuCure5366 and FSP5610, which solved the problem of oxygen impedance, both of which received good market response. In order to better solve the problem of table drying, Runo Chemical Technology Center optimized the synthesis process, recently launched a two-performance polyether amine modified acrylic-LuCure5186. The formula takes resin with a small amount of monomer, the appropriate amount of trigger agent, respectively, under the mercury lamp and LED light source to test, mainly to investigate the resin curing speed, adhesion, flexibility, odor, yellowing resistance and stability.
excellent antioxidant impedance effect is
. LuCure5186 with a small number of high-level energy monomer, in the traditional mercury light source, only about 70mJ/cm2 energy can be dried. Conventional low-function resin in 395nm wavelength LED light source curing, due to the role of oxygen impedance (base oxygen molecules in the three-line state, the photocuring process of active free radicals have a strong addition activity, the formation of non-active peroxy free radicals), it is generally difficult to thoroughly dry, paint film surface is not smooth, sticky hands, and LuCure5186 only need 500 mJ/cm2 can be completely dry. LuCure5186 as a amine-modified resin, is a lively hydrogen supply, can react quickly with non-reactive peroxygen free radicals, the active free radical regeneration, peroxy free radical hydrogen production of alkyl hydrogen peroxide, can be further decomposed into alkygen free radicals and hydroxyl free radicals, so as to achieve antioxidant impedance effect. In practical use, can be paired with high-level resin or hydrogen-grabbing trigger, further improve the drying speed.
Good toughness
many applications in the market have requirements for toughness, conventional amine modified products molecular weight is relatively small, short chain segment, poor toughness, can not meet some bending requirements of higher applications. LuCure5186 is a polyether amine modified resin, containing a relatively long polyether chain segment, has excellent flexibility, in pet film 180 degrees fold many times, paint film does not crack.
the biggest problem
anti-yellow degeneration, active amine products are prone to yellowing, and long-term storage stability is not good. LuCure5186 optimizes the synthesis process so that it is free of small molecular amine residues. In the test, its initial yellowing b is about 1.9, and within a few hours of placement will significantly further yellowing, while the conventional amine-modified resin initial yellowing b will generally exceed 4.0, and the yellowing range is not large. Due to the low yellowing value of The LuCure5186 itself, when used as an auxiliary resin in the formulation, the effect on the overall yellow resistance of the formula is very small and can be used in light color or varnish systems.
low odor
in many applications and construction processes have high requirements for the odor of raw materials, and odor problem is also a common amine products, thus limiting its use. LuCure5186 has a large molecular weight, while strictly controlling the residual problem of small molecules, so that the odor and irritation is significantly reduced, the resin itself has no special odor, cured completely after the paint film is completely odorless, fully meet the needs of different applications such as clean taste coatings, inks and so on.
flow is smooth and moisturizing
. LuCure5186 because of the long polyether chain segment, so whether it is the substrate or pigment has a good wetting effect, can avoid the paint film surface formation of micro-orange skin or Benaud vortex and other defects, has excellent leveling. At the same time, the resin is compatible, with other resins will not appear fogging, shrink holes, hemp points and other oscopic defects.
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