UV varnish is a paint, the color is transparent color Oh, do not touch this kind of paint with your fingers and skin easily Oh, otherwise it can be difficult to clean off, many people call uv varnish for uv varnish. This reading, we may be able to learn that it is not only a paint, but also a spray paint. This kind of paint will be hardened after use, to protect what we need to protect oh. The surface of the object coated with uv varnish looks very bright, very beautiful, and very round to the touch. That uv varnish formula is how?
uv varnish formula is introduced:
The main formula of UV varnish is: acrylic resin, monomer, photoinitiator, additives, solvents.
Acrylic resin: spraying more than 6 official PUA, is the main body of the film, mainly to provide adhesion, gloss, abrasion resistance and other characteristics.
Monomer: mainly used to supplement some of the functional defects of the resin, dilution, spraying: HDDA, DPHA, TMPTA.
Photoinitiators: used in UV light irradiation, triggering the polymerization of resins and monomers, spraying: 184, 907.
Auxiliaries: such as leveling agent, defoamer, wetting agent, etc., Diehl, BYK auxiliaries are the most famous, also used more. The most famous, BYK additives are also used more.
Solvent: mainly used for dilution, low unit price, spraying more esters, toluene.
UV varnish use notes:
1, UV varnish normal use temperature of 50-55 ℃, in the winter low-temperature use of UV varnish need to use a constant temperature of the waters of the cycle heating, so that its viscosity to the design of the use of the viscosity, which is conducive to the leveling of UV varnish and rapid curing.
2, UV light oil in the UV lamp irradiation area, the best temperature should be 50-60 ℃, because at this temperature UV light oil curing fast, strong adhesion after curing. That is to say, under the UV lamp is not the lower the temperature the better. Some manufacturers in the winter low-temperature plant varnish, there is bad adhesion, poor leveling, the reason is mainly due to this.
3, varnishing machine should be placed in the sun can not be directly exposed to the location, otherwise UV varnish will be in the sun under the action of ultraviolet light curing in the coating roller. If you can not avoid direct sunlight, you should also use red and black curtains to block the sun's rays.
4, the UV varnish is scraped when varnishing will be printed on the substrate will be printed on the ink to the UV varnish on the varnishing machine, so that the varnish with the color. However, after filtering and precipitation, these varnish can continue to use, do not have to throw away.
5, with the development of science and technology, the current UV varnish irritation has been greatly reduced. But the operation of the light, the skin if the UV varnish, or should be immediately washed off with soap and water, otherwise there may be skin redness, blistering.
6, UV varnish viscosity depending on the type of varnish machine, according to the varnish machine model selection of special varnish. If the viscosity of the UV varnish is not up to the viscosity required by the varnish machine can be used to remove the viscosity of the thinner or thickening agent viscosity. However, after such adjustment, the loss of UV varnish curing speed, brightness and adhesion.
UV varnish common problems and solutions
One, the gloss is not good, the brightness does not work? The main reason:
1. UV light oil viscosity is too small, the coating is too thin.
2. Ethanol and other non-reactive solvents diluted too much.
3. UV oil coating is not uniform.
4.? Paper absorption is too strong.
5.? Anilox rollers are too thin, lack of oil supply.
Solution: according to the different conditions of the paper properly improve the viscosity of the UV varnish and the amount of coating. Absorbent paper, can be coated with a layer of primer first.
Two, drying is not good, light curing incomplete, sticky appearance? The main reason:
1. UV light intensity does not work.
2.? UV lamp aging, strength weakening.
3. UV light oil storage time is too long.
4. Do not participate in the reaction of the diluent to participate in too much.
5.? Machine speed is too fast.
Solution: in the case of curing speed needs to be less than 0.5s, it is necessary to ensure that the power of high-pressure mercury lamps is usually not less than 120w/cm, the lamp should be updated in a timely manner, do not wait for the bad and then change. If necessary, participate in a certain amount of UV light oil curing accelerator to accelerate drying.
Three, the appearance of printed materials UV varnish coating, hair flower? The main reason:
1. UV light oil viscosity is small, the coating is too thin.
2. The ink contains ink blending oil or dry oil is too much.
3. The appearance of the ink has been crystallized.
4. Ink appearance of anti-sticking materials (silicone oil, spray powder) more.
5. Gluing net roller is too fine.
6. Doubts about the construction process (the skills of skilled personnel skills are not good).
Solutions: the demand for UV varnish goods printing it is necessary to adopt appropriate measures to create the conditions for UV varnish on the appropriate coating thicker, if necessary, through the primer or replace the special varnish to solve the problem.
UV varnish use, must be the temperature to fifty degrees to fifty-five degrees, only to return to the solid hardening of the change Oh, after the cycle of heating, can be made successfully Oh. uv varnish is the biggest advantage of its adhesion is very good, and the fluidity is very strong, there will be absolutely no uneven phenomenon, in addition to the uv varnish curing speed, do not worry about the coating of the artifacts! After that, your artifacts can not quickly get trial oh. After drying, you can touch the surface of the uv varnish. The above is about uv varnish formula, hope it can help you!
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