Water-like UV plastic paint development difficulties and solutions.

The emerging technology of plastic paint - water-based UV development difficulties
water-based UV system is a very good combination of UV curing and water-based technology combined with the comprehensive efficiency of the traditional solvent-based UV system has more environmental protection and safety advantages, is becoming a plastic paint formula in the emerging technology. The water-based UV system is used in plastic paint there are some difficulties, for example: due to the surface pressure of water (72 dynes/cm), resulting in water-based coatings in the general surface pressure of low plastic substrate (35-45 dynes/cm) is difficult to fully wet the spread, easy to produce shrink holes, orange peel and other ills, when it is urgent to add a suitable substrate wetting agent to reduce the surface strength of the system to achieve the purpose of wetting.
based on our many years of application experience, the wetting agents TEGO® Twin 4200 and TEGO® Wet KL 245 are well suited to the needs of the

. The following is the performance evaluation and results of the above substrate moisturizer and two common competitive products in a system with water-based UV-cured adipose polyurethane dispersion as the main resin. Considering the formulation and application needs of plastic paint, we studied the stability of the wetting agent, the wetting on the plastic substrate, and the effect of film coating gloss and shadow value on the film as the key performance.
participating in the evaluation of wetting agent products:
1, experimental evaluation: stability
because wetting agent as a common source of stability in the formulation, is not conducive to late deblistering and easy to bring a variety of paint film defects. We generally recommend evaluating the stability of the moisturizer as a key item when screening it. In other cases of close performance, try to choose unstable foam or even anti-foam moisturizer is usually the preferred solution.
we can assess the stability of the additive by foam height method. Specific test method: the use of transparent glass bottle filled liquid coating, divided into blank groups and the addition of 4 different wetting agent groups, wetting agent additions are: 0.5%. The use of high-speed oscillator oscillation to create foam, oscillation after setting aside at different times, observe and measure the paint liquid height, the higher the height, indicating that the moisturizer more stable bubble.
placed for 5 minutes, foam height:
for 30 minutes, foam height:
TEGO® Twin 4200 relative to other substrate moisturizer initial foam minimum, placed for 30 minutes also basically no foam, the overall formula will be more helpful to deblister.
2, experimental evaluation: wetting capacity and dry film surface effect
For wetting agents, its greatest role is to help the coating on the substrate wetting, so wetting performance is a key performance must be evaluated. Here's how we evaluate it. Specifically: the liquid coating diluted to a certain viscosity sprayed on the ABS substrate, 60 degrees baking 5 minutes after the UV exposure machine, dry after visual appearance, dry film thickness of 15-20 microns.
results, dry film surface status:
effect map (lamps reflected on the paint film surface):
relative reference competition 1 and 2, TEGO® Twin 4200, TEGO® Wet KL 245 have excellent wetting capacity and leveling effect.
3, experimental evaluation: after the film paint film gloss and fog shadow value
water-based plastic paint applications, especially high-gloss system, for the paint film gloss and transparency requirements are higher. The effect of additives in the formulation on post-film gloss and transparency is also a key assessment. Test method: The dry film thickness is 15-20 microns using the glossy mist imager.
results are as follows: TEGO® Twin 4200, TEGO® Wet KL 245 have little effect on the gloss and shadow of the paint film, and do not affect the transparency of the paint film.
In summary, the
1, TEGO® Twin 4200 can be used as the preferred product of the water-based UV plastic paint system, not only has a strong substrate wetting capacity and surface leveling effect, but also unstable foaming, greatly reducing the difficulty of late-stage coating deblistering, can reduce or even completely do not use deblistering agent, correspondingly due to deblistering caused by paint film problems will be greatly improved. Therefore, whether from the formulation performance or cost considerations, the choice of this wetting agent is a more preferred solution. TeGO® Twin 4200 is relatively blister-suppressing mainly because of its special twin structure, known as gemons, whose surfactants are connected by two hydrophobic chains and two polar chains through an interval base. Compared with conventional surfactants, this structure has a particularly high surf activity and different aggregation characteristics.
2, TEGO® Wet KL 245 has excellent substrate wetting capacity and surface effect, can be used as a second option for water-based UV plastic paint system, but TEGO® Wet KL245 is a traditional substrate moisturizer, relative to the 4200 will be relatively stable foaming, so the application in the formulation needs to consider with the appropriate de-foaming agent.
3, the above is for the water-like UV system of plastic paint wetting agent recommended. In the case of water-powered 2K-PU and other systems, Ewing also has suitable additive recommendations. For example: TEGO with ultra-fine atomization® Wet 240; TEGO and Wet 280 ® heavy coating requirements.
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