Water Shedding

Gentoo’s hydrophobic coating leaves no water trail.

Transparent

The Gentoo coating retains 100% transparency.

Durability

Gentoo is UV resistant, abrasion resistant and flexible.

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GENTOO HYDROPHOBIC COATING

Gentoo is a new, innovative technology that creates a completely transparent, extremely durable hydrophobic coating that repels water and prevents corrosion. While there are many hydrophobic coatings on the market, none possess the transparency and extreme durability of Gentoo.

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Gentoo hydrophobic coating is unlike traditional hydrophobic and superhydrophobic coatings with its unique ability to not only repel water, most oils and solvents but also with its significant abrasion resistance, durability and flexibility.

Gentoo succeeds where other coatings fall  short and is truly the next generation of hydrophobic coatings.

Gentoo is for Commercial sale only.

Gentoo Hydrophobic Coating Video

Gentoo Application Process

While current superhydrophobic coatings are marketed to have extremely high contact angles (> 150°) and low watershed angles, they are fragile and exhibit less than desirable durability, as the surface patterning is capable of being damaged by even the mildest abrasion, impact or contact with water and other fluids. In addition, the superhydrophobic coatings do not exhibit good adhesion to many types of surfaces, as the nanoparticles used to produce the surface texture do not form a covalent bond with the substrate. Therefore, the use of commercially available super-hydrophobic coatings for applications where abrasion resistance and durability are critical is severely limited.

Gentoo Hydrophobic Coating Water DropletAs a viable alternative to superhydrophobic coatings, UltraTech/Luna have developed a hydrophobic coating that, while having a lower contact angle, still provides excellent water-shedding capabilities, but is based on a highly durable, mechanically stable, abrasion resistant, and clear matrix. The interaction of water with the surface of the Gentoo hydrophobic surface treatment is shown at right.

The ultra-thin (<5 µm), rapid-cure, single coat system is easily applied to previously-painted, bare metallic or polymeric surfaces using common application techniques such as flow coat, brush or spray. The coating is so thin and conformal in fact that it may also be considered a surface treatment technology. The high optical transparency of the hydrophobic coating will not alter the appearance of a coated object but will shed water, improve corrosion resistance, resist mechanical abrasion and impact damage, reduce salt accumulation, dirt retention, and weathering degradation of the object. The functionalities of this hybrid coating provide a mechanism for covalent bond formation between the coating and the substrate, resulting in superior adhesion to metallic, plated and painted surfaces. The formulation of the Gentoo coating produces a highly durable coating with excellent water-shedding capability and abrasion resistance.

The hydrophobicity and light transmission properties of the Gentoo hydrophobic surface treatment are shown in Table 1. The hydrophobic surface treatment exhibits contact angles of >110° and an average watershed angle of ~3–11°, depending on water drop size and the coating formulation. The hydrophobic coating does not affect the transparency of the substrate, exhibiting negligible haze and retention of 100% clarity.

Table 1: Hydrophobicity and light transparency of coatings; WS denotes water-shedding

Contact Angle WS Angle
(50 μL)
WS Angle
(120 μL)
Transparency (%) Haze (%) Clarity (%)
Glass Substrate 50 40 30 93.9 0.8 100
Gentoo Coating 112 6 3 94.1 0.3 100

 

Gentoo Transparent Coating

 

 

 

Bare acrylic and Gentoo coated coupons were evaluated for optical quality post 500 cycles of Taber abrasion testing using CS10 wheels and a 500 g load. Note a haze of 30% was measured for the uncoated control sample. This haze is visibly apparent after the abrasion test compared with the coated sample, which is still pristine with no loss of transparency and minimal loss in haze (Table 1).

Gentoo Abrasion Results Table 1

Likewise, panels of Nitronic 50 stainless steel were coated with the durable hydrophobic coating and compared with a commercial superhydrophobic coating for abrasion resistance. Initially, the as-prepared Gentoo coating had a water contact angle of 110° compared to >150° for the commercial superhydrophobic coating. After reciprocal abrasion (Figure 1) with ScotchBriteTM abrasive pads, the superhydrophobic sample was degraded significantly and the Gentoo durable hydrophobic was unchanged under the same conditions. More importantly, the watershed angle of the commercial coating increased drastically after a small amount of abrasion, but the Gentoo coating watershed angle did not change significantly even after extensive harsh abrasion. This same result was observed when the test was performed pre and post an immersion soak in seawater.

Gentoo Abrasion Results Figure 1


Gentoo is virtually unaltered by abrasion, whereas Commercial coatings flake off and turn opaque.
Gentoo Abrasion Resistant Coating

Gentoo Abrasion Resistant Coating

The UV resistance of the Gentoo hydrophobic coating was determined in accordance with ASTM 4329. During the testing, a UVB-313 lamp with 0.63W/m2 irradiance was used. The QUV test cycle was comprised of a 7 hour period of UV exposure at 50°C followed by a 5 hour period at 50°C with a 100% relative humidity condensation cycle. The QUV test cycle was repeated for 4 weeks. Figure 1 and Table 1 show the results of the QUV testing. From the coupons shown in the figure, it is evident that QUV exposure did not have a significant effect on the properties of the coating, as no evidence of degradation, delamination, discoloration, etc. was observed. In general, the contact angle of Gentoo hydrophobic coating decreased by 7% after 4 weeks QUV exposure. The transparency and clarity of the control and of the coatings remained relatively constant throughout the test. Haze increased for all of the coatings throughout the test, though the haze remained under 1.65%, which is well under the visual limit where coatings no longer appear transparent.

Gentoo UV Exposure Resistant Coating


 

Gentoo UV Exposure Resistant Coating

 

 

The influence of chemical exposure on the contact angle was determined for various industrial chemicals commonly found in military depot settings. The chemicals investigated spanned a range of hydrocarbon, alcohol, polyalphaolefins, hydraulic fluid, deicing fluid, oils, salt water, cleaners, plastic polish and conversion coatings. As shown in Table 3, the majority of the chemicals did not have a significant influence on the contact angles of the hydrophobic coating, with < 2.1% reduction in contact angle after 48 hours of chemical exposure.

Chemical Type Change (%)
Naptha Hydrocarbon 0.0
Heptane Hydrocarbon 0.0
Jet Fuel JP-8 Fuel 0.0
Mil-H-83282 Hydraulic fluid 0.0
Mil-H-5606 Hydraulic fluid 0.0
DOD-L-85734 Oil lubricant 0.0
Mil-PRF-87252C Polyalphaolefin 0.0
90% Isopropanol Alcohol -0.5
Propylene glycol Deicing fluid -0.5
Mil-L-23699 Oil lubricant -0.8
Mil-L-7808 Oil lubricant -0.8
Mil-C-8514 Airplane wash cleaner fluid -0.8
P-P-560-Type 1 Navy plastic polish -1.4
5% Salt water Salt water -2.1