Choice of UV ink deblisters

UV ink bubble problems often plague ink formula designers, there are three main reasons:
1.There are fewer options for UV-specific desticants on the market than water-based and solvent-based desolorants.
2.Since there is no solvent in the UV ink, the viscosity is relatively high and it is more difficult to deblister.
3.Sometimes UV light oil on transparency and gloss requirements are higher, so the compatibility requirements will be relatively high

. If a formula with a high viscosity requires both excellent deblication and good compatible, then it is more difficult.
Solution 01
Try to select unstable foaming surface control additives
For ink formulations, de-foaming is premised on the elimination of blistering factors in the ink , substances with surf activity, such as surface control additives in the formulation.
, according to the product structure, surface control additives can be divided into better compatible (stable bubble) and slightly less compatible (unstable bubble) two. For example, Created's range of surface control additives is compared by product characteristics as follows. According to this table, we can accurately select those unstable foam UV surface control aids.
from the above grouping, the commonly used TEGO® Glide 410/450 belongs to the category of good compatible, more stable bubble, while TEGO® Glide 432 is slightly less compatible, belonging to the category of unstable bubble. In practical application, the difference brought about by the surface control aid stability bubble or not is not visible from the final UV photoelecturizer printing effect, that is, the impact is very small, but it will affect the transparent UV light oil canning effect. Refer to the figure below (from left to right, the foam is reduced in turn, from steady to unstable).
We added the commonly used surface control additives to an epoxy system light oil, the addition amount is 1%, the test stability obtained the following results, and the conclusions of Figure 2 are basically consistent. (5 for unstable bubbles, 1 for stable bubbles)
Note: Although the compatible between the different resins of the UV system is very different, but the above surface control additive compatible law will not change. The appropriate surface control additives can be selected according to the above information.
Solution 02
Choose the most suitable defoulant according to the application
UV commonly used to choose from a wide range of defossing agents, the following are our recommended products in the UV system:
TEGO® Airex 920/921
good compatible, does not affect the heavy coating of inks, good defocage capacity, is specifically developed for UV non-silicon dioxide polymer defoulant. TEGO ® Airex 920 is Created's best-selling UV-specific desiccant. The TEGO ® Airex 921 is an upgraded version of the TEGO® Airex 920, with a higher level of environmental safety and a formulation that complies with Swiss A regulations.
: TEGO® Airex 920/921 is commonly used in systems with high compatible requirements, such as shiny oils and flexible versions.
the ® Airex 900
has excellent de-foaming results. It is an organic-renamed polyether silica defoulant containing gas-phase silica. Its deblistering effect is second only to the ® TEGO, foamex N, but recouping and compatibility are not very good.
: especially suitable for UV m gloss oil, as well as the need for strong deblistering of UV wire mesh system. Can also be added to the bright oil, only a small amount of addition (0.05%) can play a good effect, before adding can be diluted with solvents.
TEGO ® foamex N
is the most common UV desiccant, de-foaming ability is strong, compatible is also the worst. It is an organic-renamed polyether silica defoulant containing gas-phase silica. Using it at the wrong time can cause shrink holes and cause recoating problems.
: often used in silk mesh and other systems that require strong deblistering.
TEGO ® Rad 2500
not only has a good de-foaming, but also a good smoothness, two at a time. Is a silicone polyether with cross-linked acrylic changed its name to sioxane. Its de-foaming and compatibility are somewhere between tego® Airex 920 and TEGO® And Airex 900.
applications: ideal for light oils and inks that require smooth or scratch-resistant light.
or above are solvent-free and close to 100% effective. Deblistering capabilities from weak to strong (good to poor compatible) are TEGO® Airex 920/921, TEGO® Rad 2500, TEGO® Airex 900, TEGO® Foamex N.
compatibility and deblistering force are two factors that are difficult to balance. If in a high-bright, high-transparent, high-viscosity system, the need for a very compatible and de-foaming strength is also relatively good desiccant, is more difficult, after practice, we found that the following products can meet this demand.
tego ® airex 963
is excellent for deblgability and compatibility. It is a 1% fluorosiloxane solution with a solvent of MOBK. Fluorosilicon gives TEGO ® Airex 963 to defoil well even when the effective serving is very low. Since its use of added amount is 0.3-0.5% like other defysting agents, the actual effective serving addition is only a few hundred thousand, so it has little effect on the transparency and re-coating of the light oil.