Canadian Finishing & Coatings Manufacturing Magazine September/October 2021 - 40

PAINT AND COATINGS MANUFACTURING: SOUND DAMPENERS
Soundproofing Paint
According to SoundProofSilence.com, soundabsorbing
paint can diminish noise transfer by 30
percent.
Hy-Tech Thermal Solutions is a NASA spinoff
whose Acousti-Coat product is a sound dampening
latex ceiling and wall coating. It is described
as a heavy bodied, water-based, flat latex paint
formulated with ceramic microspheres and soundabsorbing
fillers.
" The combination of a high loading of
ThermaCels with their vacuum centers reduces
sound transmission; the soft pigment fillers absorb
sound and prevent it from bouncing off surfaces, "
the company says. " It also provides a highly
effective insulating benefit to the painted surface. "
SoundGuard, which bills itself as " the world's
first soundproofing paint, " says it is working with
more than 100 hotel and apartment groups who are
using its soundproof paint in their properties.
One coat of SoundGuard achieves a two to
four decibel reduction, while four coats results
in an eight to 16 decibel reduction. The standard
application is three coats at 22-23 wet mils per
coat for a total of 68 wet mils. The product dries to
approximately 30 dry mils. Each coat typically dries
within two hours.
" SoundGuard's patent-pending soundproof paint
was specifically developed by our team to reduce
and/or eliminate sound transmission through walls
and ceilings, " the company says.
" Our high-performance architectural coating
has been independently and scientifically proven to
reduce sound transmission through interior walls
by an average of 90 percent making it the closest
thing to soundproof paint that has ever been
created. "
SoundGuard says the proprietary ingredients
in its coating work through isolation, absorption
and deflection. " Essentially we are creating an
impenetrable sound barrier on the wall that is able
to block the majority of decibels at any frequency. "
In terms of cost, SoundGuard rates its price/
square-foot at $3-4 versus $8-15 for acoustic
panels, $5-8 for spray insulation, and $6-10 for
extra drywall.
The solution
can be applied with airless devices,
reciprocating pump devices, or screw conveyors with
atomizing air.
AN2-750/EU has been classified as a non-combustible
product, class A2, in line with DIN EN 13501-1; it has also passed
toxicity and smoke gas density tests, the company says, meeting
the requirement set R1 for HL1, HL2 and HL3 for application in
rail vehicles with regard to smoke development and toxicity. This
sound dampening solution is based on an aqueous synthetic resin
dispersion and is also hydrophobic and solvent-free.
Sound Insulation Through Structure-borne
Noise Absorption
The monotonous noise produced by train wheels on tracks
can make some people sleepy while others struggle to cut out
the noise in order to sleep or work. Sound insulation and the
reduction of structure-borne noise in rail vehicles to create a
relaxing atmosphere for passengers is therefore a big challenge
for engineers.
Although some components can be produced from alternative
materials, it is often not possible to avoid thin-walled sheet
metal constructions, where significant vibration is unavoidable.
This structure-borne noise spreads almost unhindered in metal
vehicle components. These sound waves are then transmitted to
the air so that the sound occurs as an audible noise inside the car.
In order to prevent this irritating noise generation,
homogeneous layers are placed between the individual
elements for internal damping. With a composition of inorganic
components in conjunction with a low proportion of organic
components, a high acoustic dampening effect can be achieved.
When the Griwephon layer penetrates the material to which it
has been applied, the vibrational energy of the material is largely
eliminated because it converts high-frequency vibrations into
low-frequency vibrations. As a result, rail vehicle bodies emit less
noise into the interior space.
" Thanks to the special composition of our sound deadening
[solution], we achieve a very good value in terms of internal
damping, " says Grieshaber. " The loss factor, depending on the
installation situation, application thickness and material in
accordance with DIN EN ISO 6271-3, is between 0.22 and 0.24, so
40
www.cfcm.ca
http://www.SoundProofSilence.com http://www.cfcm.ca
Canadian Finishing & Coatings Manufacturing Magazine September/October 2021

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