Douglas BLEECHER, et al
Superhydrophobic Spray ( " Neverwet " )
Superhydrophobic spray NeverWet enters
US market in a $20 can
Two step spray coating makes fabrics, wood, metals and
by James Vincent
A spray on treatment that makes any object repel liquid has been
launched into the US market. This is NeverWet, a
superhydrobphobic coating that can be applied to nearly any
Consumers can now buy the two cans (capable of treating 10 to 15
square feet) for $19.97 from Home Depot. Surfaces that the spray
can be applied to include fabrics, wood, metal and plastics. The
treatement consists of two coatings, each of which takes 30
minutes to dry.
NeverWet have not yet given official figures on how long the
superhydrophobia will last in various situations, but claim that
treatments have “remained under seawater for over a year and
reemerged completely dry.”
Unfortunately, when the treatment is applied to glass it causes
the surface to become frosted, though the company behind the
product promise that a clear-drying version is in development.
A demonstration video (below) shows NeverWet in action,
including waterproofing an iPhone (something that instructions
for NeverWet explicitly warns against), a toilet brush, a
t-shirt and a pair of shoes.
Superhydrophobic surfaces works by increasing the contact angle
between water droplets and the coated surface through creating a
low surface chemistry and a smooth surface – essentially this
changes whether each individual droplet remains a ball
when it rests on a surface, or whether it spreads out.
Hydrophilic surfaces (surfaces that soak up water) have a
contact angle of less than 90 degrees. Hydrophobic surfaces have
a contact angle of above 90 degrees, but superhydrophobic
surfaces have a contact angel of above 150 degrees.
NeverWet coatings creating a contact angle of between 160 and
175 degrees (by comparison, the non-stick coating on a Teflon
pan is a 95 degrees contact angle). These are hard concepts to
understand without talking about surface tension and why water
molecules want to minimise their exposure to what is non-water.
For a great video explanation via MIT click here.
Ross Nanotechnology's NeverWet
superhydrophobic spray-on ...
NeverWet: Superhydrophobic Coatings
At NeverWet, we have developed a super hydrophobic coating that
completely repels water and heavy oils. Any object coated with
our NeverWet™ coating literally cannot be touched by liquid. Any
liquid placed on this coating is repelled and simply rolls off
without touching the underlying surface. Not only is this
amazing to see, but it solves a myriad of problems.
Address: P.O. Box 646, Leola, PA 17540
Aug 14, 2011 // Jun 18,
When these guys say NeverWet ... they
For one Lancaster County company, necessity was indeed the
mother of invention.
About three years ago, Ross Technology Corp. needed a better way
to reduce corrosion on the steel products it makes here.
When they couldn't find a suitable one, they worked on creating
something on their own.
And eventually they hit upon a slick product that's led to a
whole new business.
That product is NeverWet, a silicon-based spray-on coating that
repels water and heavy oils.
"When we started getting it to work, we realized it solved a lot
of problems rather than just corrosion," said Andy Jones, who
leads the new effort.
Jones is the president of Ross Nanotechnology, the subsidiary of
Ross Technology Corp. that was formed to develop NeverWet.
The company now employs 12 scientists, chemists and engineers.
They work out of a lab at the Ross Technology headquarters in
the Conestoga Valley Industrial Park.
In addition to fighting corrosion, NeverWet's nano-particle
coating keeps things clean, dry and free of bacteria and ice.
Jones said that once they found a coating that worked on metal,
they created different formulations that adhere better to other
surfaces, including clothing, plastics and cookware.
The cookware formulation also was tweaked so it can better
handle high temperatures.
"Anywhere you don't want corrosion, or ice or things to get wet,
this works well," Jones said.
"When you start thinking about it, there are a lot of places
where that's good."
Jones quickly mentioned a number of additional possibilities.
NeverWet could make ovens, toilet plungers and bed pans a cinch
to clean, packaging resist water and white boards free of
"ghost" images, he said.
Another application is safeguarding electronics.
"I sprayed my iPhone with NeverWet, submerged it in a foot of
water for 30 minutes, took it out and it was good to go," Jones
Ross Nanotechnology isn't the only organization that likes what
it sees in NeverWet.
In June, NeverWet won the top prize at InventHelp's INPEX trade
show in Pittsburgh. NeverWet also won a gold medal in the
The event showcases new products and innovations that are
available for business and industry to manufacture, license or
Jones said Ross Nanotechnology began licensing the NeverWet
technology to other manufacturers about two years ago.
It has sold four licenses to date and has numerous deals under
discussion with potential licensees who'd use it on the products
The decision is a time- and labor-intensive exercise.
"Everybody has their own processes, so it takes a year or more
of testing (before they decide whether to use NeverWet)," Jones
"That's the painful part of this business."
Ross Nanotechnology is focusing on a handful of niche markets,
Though declining to disclose Ross Nanotechnology's sales
figures, Jones said the company is "small now but growing
And, Jones said he expects to see some significant product
launches in early 2012.
These would include the first retail version of NeverWet for use
During a recent visit to the company's headquarters, Jones
showed off NeverWet's capabilities in what seemed like a series
of magic tricks.
On hard surfaces such as glass and ceramic that were treated
with NeverWet, water turned into nearly spherical balls that
shot in all directions.
A cotton shirt shed water. A canvas shoe repelled chocolate
syrup and was left perfectly white.
"Shoe people are all over us," eager to buy a NeverWet license.
"If you pay $200 for a pair of shoes, you want them to stay
clean," he said.
Ross Nanotechnology has yet to license NeverWet to a shoe
manufacturer, though, Jones said.
What's the secret behind NeverWet?
NeverWet — which has 13 patents pending — works much as
Scotchgard does in protecting furniture, carpets and other
surfaces. That is, it creates a very high contact angle for
water on a surface, Jones explained.
A drop of water that lies flat on a surface has a contact angle
of zero percent, but if the droplet forms into a perfect circle,
it has an angle of 180 degrees.
Human skin provides a surface angle of 75 to 90 degrees, Jones
said. Car wax provides a surface angle of about 95 degrees.
Scotchgard has an angle as high as 116 degrees.
In contrast, NeverWet has a contact angle as high as 165
degrees, which means water forms an almost perfect sphere.
Because of that shape, the water is repelled.
Materials scientist Vinod Sikka, Ross Nanotechnology's director
of research and development, played a key role in inventing
NeverWet, Jones said.
Sikka previously spent 34 years at Oak Ridge National
Laboratory, where he became manager of research and technology
But having a superior product alone isn't enough to guarantee
commercial success, Jones points out.
"It's challenging to break into the coatings market. People have
been using the same stuff from the same suppliers for a long
time," he said.
Jones sees lots of potential for NeverWet, though.
"It is very novel, and when you start thinking about it, you can
think about how transformative the technology can be," Jones
said. "You can use it everywhere."
This superhydrophobic coating is truly
After reading this article, prepare to say
to yourself, "I'm living in the future."
A superhydrophobic spray-on coating set to launch next year
could dramatically change our perception of the phrase "water
NeverWet is a patent-pending silicon-based covering that
deflects nearly all liquids and heavy oils by creating a very
high contact angle upon application. The angle is much higher
than traditional substrates, such as car wax (90 degrees),
Teflon (95 degrees), or Rain-X (110 degrees). Liquid literally
glides off NeverWet's 160 degree to 175 degree angle in a way
that almost seems like computer animation, as seen in the video
Left: Contact angles of various surfaces. Right: A droplet
sitting on a the superhydrophobic surface of a lotus leaf, which
is extremely difficult to get wet.
(Credit: Ross Nanotechnologies)
At first glance, the mind-bending NeverWet comes across as a
liquid repellent, but it is much more than that. Surfaces that
are sprayed with NeverWet repel ice, corrosion, and even
bacteria. The company behind the product, Ross Nanotechnologies,
says on its Web site that the material does not fade in strength
from blasts of high pressure. In fact, it even states that
NeverWet-infused materials "have remained under seawater for
over a year and reemerged completely dry."
A dramatic video by the company also demonstrates something
unbelievable: a waterproof iPhone. A video shows an iPhone
covered in NeverWet, sitting in a bowl of water for 30 minutes,
remaining fully functional the entire time it is submerged.
Other potential applications include a variety of objects and
places, such as shoes, electrical equipment, clothing,
hospitals, bathroom products, and much more.
Lancaster Online has an informative interview with several of
the people behind NeverWet, including co-inventor Vinod Sikka.
He admits to the Pennsylvania newspaper, "It's challenging to
break into the coatings market. People have been using the same
stuff from the same suppliers for a long time. It is very novel,
and when you start thinking about it, you can think about how
transformative the technology can be," Jones said. "You can use
COMPOSITION AND COATING FOR SUPERHYDROPHOBIC PERFORMANCE
Inventor: SIKKA VINOD // HURLEY MICHAEL
Applicant: ROSS TECHNOLOGY CORP
The present disclosure describes compositions comprising an
acrylic polymer binder and nano-particles less than about 100nm
that provide a hydrophobic or superhydrophobic coating that may
also display oleophobicity. The coating composition may
advantageously be prepared using VOC exempt compounds that are
compatible with a variety of surface materials including many
electronic components. In addition, the coating composition may
also be rapidly dried rendering it useful for the rapid
preparation of coated objects and surfaces in
manufacturing/assembly line environments.
SUPERHYDROPHOBIC AND OLEOPHOBIC COATINGS WITH LOW VOC BINDER
Inventor: GESFORD JOSH // HURLEY PHILIP
Coating compositions for the preparation of superhydrophobic
(SH) and/or oleophobic (OP) surfaces that employ low amounts of
volatile organic compounds are described. Also described are the
resulting coatings/coated surfaces and methods of their
preparation. Such coatings/surfaces have a variety of uses,
including their ability to prevent or resist water, dirt and/or
ice from attaching to a surface.
The superhydrophobic (SH) and superoleophobic surfaces are
defined as those where water or oil droplet contact angles
exceed 150[deg.]. Such surfaces have a variety of uses,
including their ability to prevent or resist water, dirt and/or
ice from attaching to a surface. A variety of hydrophobic and
oleophobic surface coating compositions have been described that
employ high amounts of volatile organic compounds (VOCs)
including those that participate in atmospheric photochemical
reactions. Those contrast with the coating compositions
described herein that utilize water and/or VOC- exempt organic
solvents that have been found to undergo limited amounts of
atmospheric photochemical reactions and lower amounts of
photochemically active VOCs.
This disclosure sets forth coating compositions that employ
water-based binder systems that have a low VOC content and/or
low non-exempt VOC content, thereby providing a variety of
environmental benefits in their application. The coating
compositions described herein remain substantially
hydrophobic/oleophobic even when abraded, and have increased
durability and/or life span when subjected to normal wear and
tear compared to coatings where hydrophobic and/or oleophobic
components are restricted to the coating's surfaces.
LOW VOC COATINGS
Compositions for forming hydrophobic and/or oleophobic coatings
described in this disclosure include one-step compositions that
employ water-based polyurethanes (or combinations of water based
polyurethanes) as a binder in combination with one or more types
of second particles. The compositions set forth in this
disclosure may optionally include one or more types of first
particles in addition to third particles.
The low VOC coating compositions described herein provide
coatings that do not lose hydrophobicity and/or oleophobicity
when their surface is abraded. As the coatings do not lose
hydrophobicity and/or oleophobicity when abraded, the coatings
permit thickness to be used as the basis to increase the
abrasion resistance and durability.
To reduce the amount of VOC's, particularly non-exempt VOC's,
that are released from coating compositions used to prepare
hydrophobic and/or oleophobic coatings, water-based (also
denoted as waterborne) binders may be used to prepare coating
compositions that result in SH and/or OP coatings, including
water-based polyurethanes (e.g., water-based polyurethane
dispersions (PUDs), emulsions, and/or suspension).
In addition to low volatile organic compound content,
water-based polyurethanes permit the formation of hydrophobic
and/or oleophobic coatings that remain substantially hydrophobic
and/or oleophobic even after substantial surface abrasion.
Moreover, water-based polyurethanes offer mechanical
flexibility, size/dimensional stability of the dried and cured
coating, and they can resist embrittlement due to heat and/or
light exposure. UV curable versions of water-based polyurethanes
(e.g., PUDs) are also available that avoid the need to heat cure
coatings, which is economically and environmentally desirable
due to reduced energy expenditure associated with light cureable
coating applications relative to those requiring or whose curing
is enhanced by heating.
1.1 Water-Based Polyurethanes As Binders
A wide variety of water-based polyurethanes (polyurethane
coating compositions comprising more than insubstantial amounts
of water as a solvent and/or diluent) may be used to prepare
hydrophobic and/or oleophobic coatings described herein.
Polyurethanes are polymers consisting of a chain of organic
units joined by urethane (carbamate) linkages. Polyurethane
polymers are typically formed through polymerization of at least
one type of monomer containing at least two isocyanate
functional groups with at least one other monomer containing at
least two hydroxyl (alcohol) groups. A catalyst may be employed
to speed the polymerization reaction. Other components may be
present in the polyurethane coating compositions to impart
desirable properties including, but not limited to, surfactants
and other additives that bring about the carbamate forming
reaction(s) yielding a coating of the desired properties in a
desired cure time.
In some embodiments, the polyurethane employed in the durable
coatings may be formed from a polyisocyanate and a mixture of
-OH (hydroxyl) and NH (amine) terminated monomers. In such
systems the polyisocyanate can be a trimer or homopolymer of
hexamethylene diisocyanate (HDI).
HDI Trimer Polyalcohol Polyurethane
Some solvents compatible with such systems include water,
n-butyl acetate, toluene, xylene, ethyl benzene, cyclohexanone,
isopropyl acetate, N-methyl pyrrolidone, and methyl isobutyl
ketone and mixtures thereof; although not all of these solvents
A variety of water-based (waterborne) polyurethane compositions
may be employed for the preparation of hydrophobic, SH and/or
oleophobic surfaces may be employed. Among the commercial
water-based polyurethanes that may be employed in the
preparation of SH and OP surfaces are those that comprise
polycarbonate, polyester, polyethers and/or polyacrylic
urethanes, and their aliphatic counterparts (aliphatic polyester
urethane resins, aliphatic polycarbonate urethane resins, and/or
aliphatic acrylic urethanes. The structures of some examples of
polyacrylic urethanes, polyester urethanes, and polycarbonate
urethanes are provided below...
EXAMPLE 3: VARIATION ON SECOND PARTICLE CONTENT IN A ONE-STEP
COATINGS PREPARED WITH BAYHYDROL(R) 140AQ/CLEAR 700T BINDER
AND CAB-O-SIL(R) TS720 RANGING FROM 11-20%
A 60:40 mixture of BAYHYDROL(R) 1.40AQ and clear POLANE(R) 700T
(F63V521) by volume was prepared using those products as
distributed by their ma ufacturers. TO 40 g amounts of each
mixture was added 4.4, 6.0, and 8.0 g (i.e., 11%, 15%, and 20%)
of CAB-O- SIL TS720. Also added to each mixture was 20-g (50%)
water. All percentages are calculated and based on 100 g of
60:40 mixture. The compositions were each mixed using steel
balls or a low impact mixer.
Each mixture was sprayed (using an air gun) on 4x 4-in square
steel plates at five different thicknesses. All of the plates
were air-dried for 30 niin prior to drying in an oven at
200[deg.]F for 30-40 min. Each plate was subjected to thickness
measurement, surface roughness measurement (Ra and Rz values),
and wear resistance using a Taber abrader (Taber abrasion). All
Taber abrasion measurements were obtained using 250-g load and
CS10 wheels. Data are summarized in Table 5 and plotted in Figs.
6-8. Figures 6 and shows the plot of surface roughness, Ra and
Rz values respectively. Figure 8 shows Taber data as a function
of coating thickness.
EXAMPLE 9: A ONE-STEP COATING COMPOSITION YIELDING
SUPERHYDROPHOBIC AND OLEOPHOBIC COATINGS
A coating composition comprising:
BAYHYDROL(R) 124 - 24.0 grams
POLANE(R) 700T (white) - 16.0 grams
M5T = 9.0 grams (Cab-o-Sil M5 silica treated with
Nonafluorohexyl)trichlorosilane (SIN 6597.6) as described below)
Corvel Black - 2.8 grams and
H20 - 20.0 grams
was prepared by blending the components as follows:
BAYHYDROL(R) 124 (24.0 grams) and POLANE(R) 700T (16.0 grams)
were blended together for 20 minutes. The addition of M5T (9.0
grams, M5 silica treated with
(3, 3,4,4,5,5,6,6, 6-Nonafluorohexyl)trichlorosilane (SIN
6597.6)) to the solution was followed by mixing in a ball mill
for 30 minutes. Addition of Corvel Black (2.8 grams) and H20
(20.0 grams) to the solution was followed by an additional 30
minutes of mixing in a ball mill.
The coating was applied using a Central Pneumatic spray gun with
the nozzle size of 0.020-0.025 inches. A coating thickness of
1.2-1.4 mils was applied to a 4 x 4 inch Al-plate. The plate was
cured at room temperature for 30 minutes followed by curing at
200F for 1-2 hours. After curing, the plates were tested for
superhydrophobicity, oleophobicity, Taber abrasion resistance,
and shower resistance to loss of superhydrophobicity. The
results of the tests show the coating displays
superhydrophobicity (contact angle = 167.33, after Taber
abrasion testing = (155.23). The coatings also display
oleophobic/superoleophobic behavior (contact angle = 153.67).
The coating lost its superhydrophobicity after 500 Taber
abrasion cycles with a 250gram load. Superhydrophobicity is lost
after 55-60 minutes in shower testing (described above);
however, superhydrophobicity returns after drying.
HIGHLY DURABLE SUPERHYDROPHOBIC, OLEOPHOBIC AND ANTI-ICING
COATINGS AND METHODS AND COMPOSITIONS FOR THEIR PREPARATION
Inventor: BLEECHER DOUGLAS // HARSH PHILIP
ANTI-ICING SUPERHYDROPHOBIC COATINGS
Inventor: GAO DI // JONES ANDREW
SUPERHYDROPHOBIC COATING OF A POLYMER
NONWOVEN, IN PARTICULAR A POLYPROPYLENE NONWOVEN
Inventor(s): BROCH-NIELSEN THOMAS [DK];
BONDERGAARD JENS [DK]; BESENBACHER FLEMMING [DK]; KINGSHOTT
PETER [DK]; MOELGAARD SOEREN [DK] +
Also published as: DE102005051550
(A1) US2009227164 (A1) DE112006002245 (A5)
The invention relates to a superhydrophic coating of a
nonwoven. According to the invention, the nonwoven material is
coated with a sponge-type net structure in the micro and nano
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