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DESCRIPTION JP2017028743

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DESCRIPTION JP2017028743
Abstract: A three-dimensional air adsorption structure for use in a volume with a time-varying
sound field is provided. The structure is a three-dimensional, integral, skeletal, porous opening
with scaffolding openings disposed within its volume, constituting at least about 50% of the
volume of the scaffolding. A porous scaffold, an air adsorbing material particle, and one or more
hydrophobic binders which bind the air adsorbing material particle to one another to form an
aggregate and attach the particle and the aggregate to the scaffold. The structure has structural
openings in the aggregates and in the structural openings between the aggregates, such
structural openings are open to the external environment and are measured by mercury
porosimetry, about 0.01 micro. The cumulative volume of structural openings having an
apparent diameter greater than meters is at least 40% of the volume of the air-adsorbed
structure, and structural openings having an apparent diameter greater than about 5
micrometers, as measured by mercury porosimetry. The cumulative volume of is at least 15% of
the volume of the air adsorbing structure. [Selected figure] Figure 8
[0009] Embodiments can include one of the following features, or any combination thereof. The
cumulative volume of structural openings having an apparent diameter greater than about 5
micrometers, as measured by mercury porosimetry, may be greater than 0.2 ml per gram of airadsorbed structure. The cumulative volume of structural openings having an apparent diameter
greater than about 0.01 micrometers, as measured by mercury porosimetry, may be greater than
0.6 ml per gram of air-adsorbed structure. The structure may further include a closed volume
that is not open to the external environment, wherein the volume of the structure opening is
larger than the volume of the closed volume. The volume of the structural opening may be at
least nine times the volume of the closed volume.
[0011] Embodiments can include one of the following features, or any combination thereof. The
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openings in the structure are also open to the periphery and may include one or more channels
in the structure having a diameter greater than 250 micrometers. The binder is such that the
surface tension of the film cast with the binder is less than about 55 dynes / cm or even less than
about 45 dynes / cm, as measured in deionized water as the test solution. , May be sufficiently
hydrophobic. The air adsorbing material may comprise a silicon-based zeolitic material or
powdered activated carbon. The structure may further include a closed volume that is not open
to the external environment, the surface area of the structure opening plus the surface area of
the closed volume, measured with a CT scan having a resolution of at least 5 micrometers, 1 mm
of the air adsorption structure. It is at least about 3 mm <2> per <3>. The acidity of the air
adsorbing structure, as determined by mixing 1 part by weight of structure 1 with 5 parts by
weight of water and measuring the resulting pH, is preferably such that the pH is greater than 4.
[0018] The structure has structural openings in the aggregates and structural openings between
the aggregates. The structural opening is open to the periphery so that the air adsorbing material
being exposed to the structural opening can adsorb and desorb air when the structure is exposed
to a time-varying acoustic field. The structure may also have a closed volume that is a pocket or
chamber that is not open at the periphery, which does not contribute to the air adsorption
capacity of the structure. In a non-limiting example, the cumulative volume of structural
openings having an apparent diameter greater than about 0.01 micrometers, as measured by
mercury porosimetry, is greater than 0.6 ml / g of air adsorbing structure, and The cumulative
volume of structural openings having an apparent diameter greater than about 5 micrometers, as
measured by mercury intrusion, is greater than 0.2 ml per gram of air-adsorbed structure.
Similarly, in a non-limiting example, the cumulative volume of structural openings having an
apparent diameter greater than about 5 micrometers as measured by mercury porosimetry is at
least about 15% of the volume of the air adsorbing structure. In another non-limiting example,
the cumulative volume of structural openings having an apparent diameter greater than about
0.01 micrometers, as measured by mercury porosimetry, is at least 40% of the volume of the air
adsorbing structure. The air adsorbing material is generally a zeolitic material (generally a
silicon-based zeolite) and / or powdered or granular activated carbon.
[0026] Figures 3A and 3B are CT scans of a portion of a three dimensional air adsorption
structure. The structure is comprised of a zeolite air adsorbing material, an acrylic binder, and a
melamine foam. It was made by mixing 12 grams of zeolite, 0.5 grams of binder, and 15 grams of
water to form a slurry. The slurry is then impregnated with foam and dried at a temperature
below 0 ° C. under low steam pressure until liquid removal of more than 60%, followed by a
heat treatment of 150 ° C. The bright areas are aggregates of the zeolitic material bound to the
scaffold. Dark areas are openings between aggregates. The elongated nature of the aggregates
and the openings between the aggregates is postulated to be due to lyophilisation. The surface
area of the structural aperture plus the surface area of the closed volume in the air adsorbing
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structure is preferably at least about 3 mm <2> per mm <3> of the air adsorbing structure, as
measured by a CT scan having a resolution of at least 5 micrometers. It is.
[0027] The following measurements were carried out using a mercury intrusion test according to
ASTM D4404-10, with samples dried at 150 ° C. for 4 hours before testing. Mercury intrusion
testing measures the cumulative volume of the structural opening as a function of the apparent
diameter of the structural opening. Reference is made to FIG. 4 for mercury intrusion data for
one embodiment of an air adsorption structure according to the present invention. In this case,
the volume of the structural openings in the air adsorbing structure having an apparent diameter
greater than about 5 micrometers is greater than 0.4 ml / g of three dimensional air adsorbing
structure. More generally, the volume of the structural openings in the air-adsorbing structure
having an "apparent diameter" as determined in ASTM D4404-10 greater than about 0.01
micrometers as measured by mercury intrusion is preferably It is larger than 0.6 ml per 1 g of
three-dimensional air adsorption structure. The volume of the structural openings of the air
adsorption structure having an apparent diameter greater than about 5 micrometers, as
measured by mercury porosimetry, is preferably greater than 0.2 ml per gram of the three
dimensional air adsorption structure. The cumulative total volume of all structural openings of
the air adsorption structure, as measured by mercury porosimetry, is preferably at least about
40% of the volume of the structure. The cumulative volume of structural openings having an
apparent diameter greater than 5 micrometers, as measured by mercury porosimetry, is
preferably greater than 15% of the volume of the structure.
[0039] When the second element in the silicate zeolite is of a different valence than silicon, the
zeolite is not neutrally charged and acts to balance the charge of the zeolite, alkali metals,
ammonium, hydrogen ions, metal ions or Including charged counterions such as mixtures
thereof. The counter ion affects the acidity of the zeolite. The acidity of the zeolite was
determined by mixing 1 part by weight of zeolite or three-dimensional air adsorbing structure
into 5 parts by weight of water and measuring the resulting pH. Using a zeolite with a pH greater
than 4 measured in this way and a three-dimensional air adsorption structure to reduce any
tendency of the zeolite or three-dimensional air adsorption structure to corrode metal inside the
speaker enclosure desirable. For example, zeolite 6 (Tables 1 and 2) contains an ammonium
counter cation and its pH is 7. When the material is heat treated in air at 600 ° C., the counter
cation in this same zeolite becomes hydrogen ions and the pH of this zeolite likewise decreases to
3.2. The potential corrosion caused by such acidic zeolite has been shown to decrease when the
pH exceeds 4 as measured by the above procedure.
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