EP4302292B1 - Akustisches dämmmaterial - Google Patents

Akustisches dämmmaterial Download PDF

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Publication number
EP4302292B1
EP4302292B1 EP22713732.0A EP22713732A EP4302292B1 EP 4302292 B1 EP4302292 B1 EP 4302292B1 EP 22713732 A EP22713732 A EP 22713732A EP 4302292 B1 EP4302292 B1 EP 4302292B1
Authority
EP
European Patent Office
Prior art keywords
acoustic
acoustic damper
powder
comprised
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22713732.0A
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English (en)
French (fr)
Other versions
EP4302292A1 (de
EP4302292C0 (de
Inventor
Giovanni BERTOLAJA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Becchis Osiride Srl
Original Assignee
Becchis Osiride Srl
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Publication date
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Publication of EP4302292A1 publication Critical patent/EP4302292A1/de
Application granted granted Critical
Publication of EP4302292B1 publication Critical patent/EP4302292B1/de
Publication of EP4302292C0 publication Critical patent/EP4302292C0/de
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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/165—Particles in a matrix

Definitions

  • the present invention relates to a highly effective acoustic damper comprising Poaceae powder (Bambusoideae), in particular, to an acoustic damper of the type in sheets.
  • Poaceae powder Bambusoideae
  • damping indicates the ability of a material to attenuate the vibrational motion to which it is subjected.
  • the glass transition temperature of the viscoelastic materials is, for example, lowered.
  • the ones comprising bitumen as a viscoelastic material are known.
  • various resins can be added to such dampers as additives.
  • lamellar fillers such as mica or graphite to the dampers.
  • the object of the present invention is to provide an acoustic damper with improved damping properties.
  • an acoustic damper according to independent claim 1.
  • the present invention provides a process for manufacturing an acoustic damper as defined in independent claim 6, and uses of acoustic dampers as defined in independent claims 8 and 10, respectively.
  • Bituminous material or distilled bitumen is understood to be a viscoelastic material consisting of distillation residues of crude oil.
  • Fillers are understood to be substances of various nature which can optionally be added to the viscoelastic materials in order to improve the chemical and physical characteristics of the acoustic dampers.
  • the acoustic damper can also comprise fillers such as, for example, at least one mineral filler selected from the group consisting of talc, calcium carbonate, coal ash or biomass ash, in a variable quantity from 10% to 60%.
  • fillers such as, for example, at least one mineral filler selected from the group consisting of talc, calcium carbonate, coal ash or biomass ash, in a variable quantity from 10% to 60%.
  • the acoustic damper can also comprise lamellar fillers such as for example graphite or mica.
  • the acoustic damper can also further comprise plasticizers or oils of natural origin or other polymers such as, for example, SBR or PP, preferably in a quantity comprised between 1 and 10%, more preferably in a quantity comprised between 1% and 3% by weight.
  • plasticizers or oils of natural origin or other polymers such as, for example, SBR or PP, preferably in a quantity comprised between 1 and 10%, more preferably in a quantity comprised between 1% and 3% by weight.
  • the provided acoustic damper further comprises Poaceae powder, preferably the Poaceae are Bambusoideae. More preferably, the Bambusoideae are bamboo or giant bamboo.
  • the powder is made up of particles having a size comprised between 120 and 325 mesh (0.044 mm and 0.125 mm).
  • the powder is added directly to the viscoelastic material.
  • the natural bamboo powder does not undergo the carbonization process.
  • It has a water content comprised between 1 and 10% by weight, more preferably 5% and 7%.
  • the powder derives from grinding and is added in percentages comprised between 5% and 60% by weight, more preferably between 10% and 50% by weight with respect to the weight of the acoustic damper.
  • the powder When added in such proportions, the powder allows obtaining an increase in the damping as shown in the examples presented in the following.
  • the acoustic dampers of the present invention can advantageously be used in the form of calendered sheets or as template die-cut calendered sheets.
  • the coupling to the surface to be treated can be made by means of heating in an oven or by means of self-adhesive glues.
  • the acoustic dampers are applied, for example, inside vehicles.
  • the acoustic dampers of the present invention have a reduced thermal conductivity with respect to other known fillers and preferably comprised between 0.258 and 0.384 W/mK, which is an advantage in particular when the acoustic dampers of the present invention are used in household appliances, for example for the thermoacoustic treatment of dishwashers.
  • the addition of the Poaceae powder (Bambusoideae) is very advantageous from the environmental point of view, since it is a plant species that grows back quickly, thus the indefinite reforestation is ensured.
  • the Poaceae (Bambusoideae) are a grass, not a wood species, and thanks to this characteristic thereof, they have a lighter impact on the environment. It is known that they capture five times more Co2 than the young forests, producing an extra 35% of oxygen.
  • Examples of fillers usable for improving the damping characteristics of a viscoelastic material and providing an acoustic damper according to the known art and according to the present invention are listed in Table 1, where it can be observed that, while the average size of the Poaceae powder particles is similar to that of the particles of the known fillers, the density instead is much lower, thus allowing obtaining acoustic dampers on the whole lighter.
  • Table 1 Material Form Density g/ml Granulometry mesh Calcium carbonate Powder 2.6 140:400 Talc Powder 2.6 230:400 Lamellar graphite Powder 2.5 35:297 Lamellar mica Powder 2.6 35:297 Giant bamboo powder Powder 1.3 120:325
  • the density is calculated from the hydrostatic thrust.
  • the hydrostatic thrust method prevents the problem of determining the volume because it requires for the sample to be weighed twice in two different media (air and a liquid). The volume can thus be considered constant in both situations.
  • the volume of a solid sample is determined by observing the increase in the level of the liquid in which the sample is immersed.
  • the pycnometer is first weighed empty and then filled with the reference liquid of known density. The sample is inserted in the clean and dry pycnometer. The weight of the sample is determined in this way.
  • the pycnometer is then filled with the same liquid and weighed again. In this way, it is possible to determine the weight of the shifted liquid and thus calculate the density of the sample.
  • the thermal conductivity test is conducted for each value on three samples according to the standard UNI EN 12664:2002, Thermal performance of building materials and products, through the determination of the thermal resistance with the guard ring hot plate method and with the heat flow meter method and ASTM E1530:2019, Standard test method for evaluating the resistance to the thermal transmission by means of a flow meter.
  • the standards establish the methods for determining the thermal values of the design and of the ASTM standard, on which the operating principle of the used measurement apparatus is based. The latter implements the method with a heat flow meter and guard ring, which allows the determination, indirectly and subject to calibration procedure of the instrument, of the thermal conductivity.
  • the penetration test is conducted on three samples of bitumen, according to the standard ASTM D5/D5M - 20.
  • the baking cup After 24 hours, the baking cup is completely immersed in a thermostatic bath at 25°C for 2 hours.
  • the penetrometer consists of a metal arm connected to a support bar that allows it to vertically slide in order to adjust its height.
  • a cavity in which, by means of a screw, it is possible to fix a removable needle.
  • the dial which allows reading the penetration of the needle in the sample expressed in dmm.
  • the range of the instrument is 360 dmm and the sensitivity is 1 dmm.
  • the electronic device consisting of the rest plane of the sample and which is connected to the movable arm, which is released for the time required to carry out the measurement (5 ⁇ 1 s) when the measurement is initiated. Mount one of the needles, cleaned with acetone, at the base of the arm. Set the needle of the dial to zero.
  • the height of the arm will have decreased by a certain amount depending on the depth of penetration.
  • the needle of the dial will have shifted giving a measurement in dmm of how much the needle penetrated inside the sample.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Vibration Prevention Devices (AREA)
  • Headphones And Earphones (AREA)

Claims (10)

  1. Akustikdämpfer, umfassend destilliertes Bitumen mit Penetrationsgraden im Bereich zwischen 20/30 und 50/70, wobei der akustische Dämpfer ferner ein Poaceae-Pulver mit einer Größe zwischen 120 und 325 mesh (0,044 mm und 0,125 mm) umfasst.
  2. Akustikdämpfer nach Anspruch 1, wobei die Poaceae Bambusoideae sind.
  3. Akustikdämpfer nach Anspruch 2, wobei die Bambusoideae Bambus oder Riesenbambus sind.
  4. Akustikdämpfer nach einem der vorhergehenden Ansprüche, wobei der Akustikdämpfer ferner einen Füllstoff umfasst, ausgewählt aus der Gruppe bestehend aus Talk, Schiefer, Kalziumkarbonat, Graphit oder Glimmer, oder eine Substanz, ausgewählt aus der Gruppe bestehend aus Weichmachern, Ölen natürlichen Ursprungs, SBR und PP.
  5. Akustikdämpfer nach einem der vorhergehenden Ansprüche, wobei das Pulver in einem Prozentsatz im Bereich zwischen 10 Gew.-% und 50 Gew.-%, bezogen auf das Gesamtgewicht des Akustikdämpfers, zugegeben wird.
  6. Verfahren zur Herstellung eines Akustikdämpfers nach einem der Ansprüche 2 bis 5, wobei das Verfahren einen Schritt zum Zugeben eines Bambusoideae-Pulvers mit einem Wassergehalt im Bereich zwischen 1 und 10 Gew.-% zu einem viskoelastischen Material umfasst, das destilliertes Bitumen mit einem Penetrationsgrad im Bereich zwischen 20/30 und 50/70 umfasst.
  7. Verfahren zur Herstellung eines Akustikdämpfers nach Anspruch 6, das ferner einen Schritt zum Kalandrieren von Platten umfasst.
  8. Verwendung von Akustikdämpfern nach einem der Ansprüche 1 bis 5 in Form von kalandrierten Platten.
  9. Verwendung von Akustikdämpfern nach Anspruch 8 in Form von schablonengestanzten Platten.
  10. Verwendung von Akustikdämpfern nach einem der Ansprüche 1 bis 5 in Haushaltsgeräten oder in einer Form, die an die Innenkarosserie von Fahrzeugen geklebt wird.
EP22713732.0A 2021-03-05 2022-03-04 Akustisches dämmmaterial Active EP4302292B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102021000005210A IT202100005210A1 (it) 2021-03-05 2021-03-05 Smorzante acustico ad alta efficacia
PCT/IB2022/051938 WO2022185275A1 (en) 2021-03-05 2022-03-04 Acoustic damper material

Publications (3)

Publication Number Publication Date
EP4302292A1 EP4302292A1 (de) 2024-01-10
EP4302292B1 true EP4302292B1 (de) 2024-07-10
EP4302292C0 EP4302292C0 (de) 2024-07-10

Family

ID=76375413

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22713732.0A Active EP4302292B1 (de) 2021-03-05 2022-03-04 Akustisches dämmmaterial

Country Status (5)

Country Link
EP (1) EP4302292B1 (de)
ES (1) ES2987555T3 (de)
IT (1) IT202100005210A1 (de)
PL (1) PL4302292T3 (de)
WO (1) WO2022185275A1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2302620B1 (de) * 2008-07-17 2021-03-03 Nagoya Oilchemical Co., Ltd. Stoss- und schallabsorbierendes material sowie schallabsorbierende struktur
CN102618050A (zh) * 2012-03-29 2012-08-01 江苏田娘农业科技有限公司 一种改性复合材料的制备方法
CN102618049A (zh) * 2012-03-29 2012-08-01 常熟市常福有机复合肥有限公司 一种防静电竹纤维模具复合材料
CN103936352B (zh) * 2014-03-27 2016-02-24 滁州市三和纤维制造有限公司 一种含有石棉纤维的高强度保温砂浆
CN109666218A (zh) * 2018-12-27 2019-04-23 上海瀚氏科技集团有限公司 用于汽车内饰件的pp/poe塑料及其制备方法

Also Published As

Publication number Publication date
ES2987555T3 (es) 2024-11-15
PL4302292T3 (pl) 2024-10-14
EP4302292A1 (de) 2024-01-10
WO2022185275A1 (en) 2022-09-09
IT202100005210A1 (it) 2022-09-05
EP4302292C0 (de) 2024-07-10

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