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WO2019058185A1 - Fabrication de couches absorbantes acoustiques - Google Patents

Fabrication de couches absorbantes acoustiques Download PDF

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Publication number
WO2019058185A1
WO2019058185A1 PCT/IB2018/053552 IB2018053552W WO2019058185A1 WO 2019058185 A1 WO2019058185 A1 WO 2019058185A1 IB 2018053552 W IB2018053552 W IB 2018053552W WO 2019058185 A1 WO2019058185 A1 WO 2019058185A1
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WO
WIPO (PCT)
Prior art keywords
aerogel
coating paste
drying
filled
synthesized
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.)
Ceased
Application number
PCT/IB2018/053552
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English (en)
Inventor
Zahra MAZROUEI-SEBDANI
Akbar Khoddami
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2019058185A1 publication Critical patent/WO2019058185A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/50—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with organometallic compounds; with organic compounds containing boron, silicon, selenium or tellurium atoms
    • D06M13/51—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond
    • D06M13/513—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond with at least one carbon-silicon bond
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2400/00—Specific information on the treatment or the process itself not provided in D06M23/00-D06M23/18
    • D06M2400/02—Treating compositions in the form of solgel or aerogel

Definitions

  • the present disclosure generally relates to sound insulators, and particularly to a method for fabricating sound absorbing layers.
  • Noise is generally defined as an unpleasant sound that may harm human ears. Noise may be reduced by utilizing sound-absorbing materials. Sound-absorbing materials generally have porous structures and size and number of pores in the porous structures may significantly affect their sound absorption properties.
  • silica aerogels are excellent acoustic insulators. Aerogels are sol-gel materials that are dried in such a way as to avoid pore collapse, leaving an intact solid nanostructure in a material that is 90- 99% air by volume. Aerogels, known as frozen smoke or air-glass, may include nanoparticles with typical dimensions of less than 10 nm and pore sizes of less than 50 nm. The high porosity of the aerogel materials makes them excellent sound insulators. The propagation of an acoustic wave in an aerogel is attenuated in both amplitude and velocity because the wave energy is progressively transferred from the gas to the aerogel solid network.
  • aerogels are brittle and fragile materials.
  • One approach to tackle this drawback is using a continuous nonwoven fiber batting to further reinforce the aerogels. While nonwoven fabrics are known as good sound absorbers at high frequency, they are less effective at low and middle frequencies where human sensitivity to noise is higher.
  • introduction of fiber assemblies to the aerogel structures not only may reinforce fragile aerogel structures but also may improve acoustical behavior of the nonwovens especially at low frequencies.
  • aerogels with blanket-type forms micron and submicron inorganic or organic fibers are added to a silica sol as a reinforcement, and these flexible blanket-type forms are prepared via a direct gelation of silica on the fibers.
  • the present disclosure is directed to a method for fabrication of a sound absorbing layer.
  • the method may include synthesizing an aerogel powder, preparing an aerogel -filled coating paste by mixing the synthesized aerogel with a coating paste, and coating a substrate with the aerogel-filled coating paste.
  • preparing an aerogel-filled coating paste by mixing the synthesized aerogel with a coating paste may include adding the synthesized aerogel to the coating paste in an amount between 0 and 10 wt. % based on a total weight of the aerogel-filled coating paste.
  • the coating paste may further include 0.5 to 3 wt. % of a thickening agent, 2 to 10 wt. % of a binder, and 0.0 to 1 wt. % of a pigment.
  • preparing an aerogel-filled coating paste by mixing the synthesized aerogel with a coating paste may include mixing the synthesized aerogel with a coating paste.
  • the coating paste may include 2 to 10 wt. % of a binder, 1 to 5 wt. % of a viscosity adjustment agent, and 5 to 10 wt. % of a flame retarding agent.
  • the aerogel -filled coating paste may include 1 to 15 wt. % of the synthesized aerogel.
  • the binder may be selected from the group consisting of acrylates, cyanoacrylates, methacrylate epoxide, ethylene vinyl acetate, urea, polyamides, polyesters, polyethylene, polystyrenes, polyurethanes, polyvinyl acetates, polyvinyl alcohols, and silicone.
  • the viscosity adjustment agent may include a filler with a chemical base comprising one of polymeric fibers, calcium carbonate, sodium carbonate, or inorganic like silica, titania, alumina, zinc oxides.
  • the flame retarding agent includes a flame- retardant material with a chemical base may include one of ammonium salts, boric acid and/or borax, phosphorous- and nitrogen-containing chemicals, halogen-containing chemicals, zirconate and titanate salts, and mixtures thereof.
  • preparing an aerogel-filled coating paste by mixing the synthesized aerogel with a coating paste may include vigorous stirring of the mixture at 600 rpm to 1100 rpm for 5 to 45 minutes.
  • coating a substrate with the aerogel-filled coating paste may include submerging the substrate in the aerogel-filled coating paste.
  • coating the substrate with the aerogel-filled coating paste may further include drying the coated substrate at ambient pressure, and curing the dried coated substrate at an elevated temperature.
  • drying the coated substrate at ambient pressure may include drying the coated substrate at ambient temperature for 2 to 24 hours. According to other implementations, drying the coated substrate at ambient pressure may further include drying the coated substrate at ambient pressure and at a temperature of approximately 50 °C to 120 °C for 2 to 15 minutes.
  • curing the dried coated substrate at an elevated temperature may include curing the substrate at an elevated temperature of approximately 150 °C to 200 °C.
  • preparing a silicic acid solution may include passing a sodium silicate solution with a concentration between 10 wt. % and 30 wt.% through an ion-exchange resin.
  • subjecting the silicic acid solution to a gelation process to obtain a hydrogel may include mixing an ammonia solution with a concentration between 1 wt. % and 10 wt. % with the collected silicic acid.
  • exchanging water content of the hydrogel with an alcohol may include washing the hydrogel with an alcohol including one of propan-2-ol, methanol, ethanol, propanol, butanol, hexanol, and mixtures thereof.
  • exchanging the alcohol of the alcogel with an organic solvent may include washing the alcogel with an organic solvent including one of n- hexane, cyclohexane, heptane, octane, benzene, toluene, xylene, and mixtures thereof.
  • drying the modified organogel at ambient pressure may include air drying the modified aerogel at room temperature for a duration of at least 2 hours and then drying the modified gel at an elevated temperature between 50 °C and 230 °C for approximately 1 hour.
  • an aerogel-filled coating paste may include 1 to 15 wt. % of an aerogel 2 to 10 wt. % of a binder, 1 to 5 wt. % of a viscosity adjustment agent, and 5 to 10 wt. % of a flame retarding agent.
  • FIG. 1A illustrates a method for fabrication of a sound absorbing layer, according to one or more implementations of the present disclosure
  • FIG. IB illustrates an implementation of synthesizing an aerogel powder, according to one or more implementations of the present disclosure
  • FIG. 1C illustrates an implementation of coating a substrate with an aerogel-filled coating paste, according to an implementation of the present disclosure
  • FIG. 2 shows a logarithmic graph of sound absorption coefficient of a coated nonwoven fabric for different sound frequencies, as described in connection with EXAMPLE 1;
  • FIG. 3A illustrates a scanning electron microscope (SEM) image of a nonwoven fabric before being coated
  • FIG. 3B illustrates an SEM image of the nonwoven fabric of FIG. 3A now coated with an aerogel -filled paste as described in detail in connection with EXAMPLE 1;
  • FIG. 4 shows contact angle of a water droplet on a surface of a coated nonwoven fabric, according to an implementation of the present disclosure as described in connection with EXAMPLE 1;
  • FIG. 5 shows a logarithmic graph of sound absorption coefficient of a coated nonwoven fabric for different sound frequencies, as described in connection with EXAMPLE 2;
  • FIG. 6 shows contact angle of a water droplet on a surface of a coated nonwoven fabric, according to an implementation of the present disclosure as described in connection with EXAMPLE 2.
  • the following disclosure describes techniques and methods for fabrication of sound absorbing layers by applying or otherwise coating aerogels over substrates, such as woven or nonwoven fabrics and thereby imparting the sound-absorbing properties of the aerogels to the substrate.
  • the disclosed methods may include synthesizing an aerogel powder from non- expensive and available precursors such as sodium silicate via simple sol-gel methods where the drying step is carried out at ambient pressure.
  • the disclosed methods may further include, coating the synthesized aerogel over the substrate to fabricate a sound absorbing layer.
  • the synthesized aerogel may be coated by first preparing a coating paste containing the aerogel and then coating the substrate with the coating paste.
  • FIG. 1A illustrates a method 100 for fabrication of a sound absorbing layer, according to one or more implementations of the present disclosure.
  • the method 100 may include a step 101 of synthesizing an aerogel powder; a step 102 of preparing an aerogel- filled coating paste by mixing the synthesized aerogel with a coating paste, such as a textile printing paste; and a step 103 of coating a substrate with the aerogel-filled coating paste.
  • FIG. IB illustrates an implementation of the step 101 of synthesizing an aerogel powder.
  • the step 101 may include a step 111 of preparing a silicic acid solution by passing a sodium silicate solution through an ion-exchange resin to remove sodium ions; a step 112 of subjecting the silicic acid solution to a gelation process to obtain a hydrogel; a step 113 of exchanging water content of the hydrogel with an alcohol to obtain an alcogel; a step 114 of exchanging the alcohol of the alcogel with an organic solvent such as n-hexane, cyclohexane, or heptane to obtain an organogel; a step 115 of modifying the organogel by incubating the organogel with one of trimethylsilyl chloride (TMCS)-n-hexane, TMCS-cyclohexane, TMCS -heptane, hexamethyldisiloxane (HMDS)
  • TMCS trimethyls
  • the step 111 of preparing a silicic acid solution may include passing a sodium silicate solution with a concentration between 10 wt. % and 30 wt.% through an ion-exchange resin, such as Amberlite IR 120 H resin, or Purolite to remove sodium ions.
  • passing the sodium silicate solution through the ion-exchange resin may include passing the sodium silicate solution through a resin-filled column and then collecting the prepared silicic acid solution from the column.
  • the step 112 of subjecting the silicic acid solution to a gelation process to obtain a hydrogel may include mixing a pH adjusting solution, such as an ammonia solution with a concentration between 1 wt.% and 10 wt.% with the collected silicic acid to adjust the pH of the mixture at a value between 4.5 and 5.5.
  • the step 112 may further include aging the obtained hydrogel for 1 to 5 hours.
  • the step 113 of exchanging water content of the hydrogel with an alcohol to obtain an alcogel may include washing the hydrogel with an alcohol, such as propan-2-ol, methanol, ethanol, propanol, butanol, or hexanol.
  • an alcohol such as propan-2-ol, methanol, ethanol, propanol, butanol, or hexanol.
  • the step 114 of exchanging the alcohol of the alcogel with an organic solvent such as n-hexane, cyclohexane, heptane, octane, benzene, toluene, or xylene to obtain an organogel may include washing the alcogel with the organic solvent solution.
  • the step 115 of modifying the organogel may include incubating the organogel with a modifying mixture, such as a TMCS-n-hexane mixture.
  • a modifying mixture such as a TMCS-n-hexane mixture.
  • the modifying mixture may be one of TMCS-cyclohexane, TMCS -heptane, HMDS-n-hexane, HMDS- cyclohexane, or HMDS -heptane.
  • the step 116 of drying the modified organogel to obtain a dried aerogel may include drying the modified organogel at ambient pressure.
  • drying the modified organogel at ambient pressure may include air drying the modified aerogel at room temperature for a duration of at least 2 hours and then drying the modified gel at an elevated temperature between 50 °C and 230 °C for approximately 1 hour.
  • the step 117 of grinding the dried aerogel to obtain the aerogel powder may include subjecting the dried aerogel to a ball milling process.
  • the dried aerogel may be gently grinded in a ball mill with for example two zirconia balls at 150 rpm for 120 minutes.
  • the step 102 of preparing an aerogel-filled coating paste may include mixing the prepared aerogel with a coating paste with a concentration of at most 10 wt.% based on the total weight pf the aerogel -filled coating paste.
  • the coating paste may include 0.5 to 3 wt.
  • mixing the prepared aerogel with the coating paste may include vigorous stirring of the mixture at 600 rpm to 1100 rpm for 5 to 45 minutes to obtain a homogeneous aerogel-filled paste.
  • the homogeneous aerogel-filled paste may include 1 to 15 wt. % of the aerogel, 2 to 10 wt. % of a binder, 1 to 5 wt. % of a viscosity adjustment agent, and 5 to 10 wt. % of a flame retarding agent.
  • the binder may have a chemical base comprising one of acrylates, cyanoacrylates, methacrylate epoxide, ethylene vinyl acetate, urea, polyamides, polyesters, polyethylene, polystyrenes, polyurethanes, polyvinyl acetates, polyvinyl alcohols, and silicone.
  • the viscosity adjustment agent may be a filler with a chemical base comprising one of polymeric fibers, calcium carbonate, sodium carbonate, or inorganic like silica, titania, alumina, zinc oxides.
  • the flame retarding agent may be a flame-retardant material with a chemical base comprising one of ammonium salts, boric acid and/or borax, phosphorous- and nitrogen-containing chemicals, halogen-containing chemicals, zirconate and titanate salts, and mixtures thereof.
  • the flame retarding agent may be added to the aerogel-filled coating paste and in another example, the flame retarding agent may be added as a flame retarding finishing on the coated substrate.
  • the step 103 of coating the substrate with the aerogel-filled coating paste may include a coating method comprising one of pad-dry, pad-cure, pad-dry-cure, knife over roll coating-dry, knife over roll coating-cure, knife over roll coating-dry-cure, knife over screen coating-dry, knife over screen coating-cure, knife over screen coating-dry-cure, foam coating-dry, foam coating-cure, foam coating-dry-cure, screen printing-dry, screen printing-cure, screen printing-dry-cure, rotary printing-dry, rotary printing-cure, rotary printing-dry-cure.
  • the substrate may be a nonwoven or a woven fabric that may be made of organic or inorganic polymers.
  • the substrate may be a polymer fabric made of a polymer such as polyester, polypropylene, polyamides, cotton, wool, and mixtures thereof.
  • FIG. 1C illustrates an implementation of the step 103 of coating the substrate with the aerogel-filled coating paste.
  • the step 103 may include a step 131 of submerging the substrate in the aerogel -filled coating paste; a step 132 of squeezing excess aerogel-filled coating paste out of the substrate; a step 133 of drying the coated substrate at ambient pressure; and a further step 134 of curing the dried coated substrate at an elevated temperature.
  • the step 131 of submerging the substrate in the aerogel -filled coating paste may include passing the substrate through a bath of the hydrogel-filled coating paste with a speed of 1 to 5 m/min.
  • the step 132 of squeezing excess aerogel-filled coating paste out of the substrate may include utilizing a padding process with an average pressure between 1 and 5 bar.
  • the step 133 of drying the coated substrate at ambient pressure may include drying the coated substrate at ambient temperature for 2 to 24 hours.
  • drying the coated substrate at ambient pressure may include drying the coated substrate at ambient pressure and at a temperature of approximately 50 °C to 120 °C for 2 to 15 minutes.
  • the step 134 of curing the dried coated substrate at an elevated temperature may include curing the substrate at an elevated temperature of approximately 150 °C to 200 °C.
  • a sound absorbing layer is synthesized pursuant to the teachings of the present disclosure.
  • Approximately 2 g of a silica aerogel synthesized from water-glass is added into 100 g of a foam-derived paste that contains 10 g of a urethane binding agent.
  • the silica aerogel and the foam-derived paste are mixed in a mechanical stirrer under vigorous stirring for several minutes to form a homogenous aerogel filled-paste.
  • pad- dry-cure method is used for coating the aerogel-filled paste on a polyester nonwoven fabric with 1 mm thickness.
  • the polyester nonwoven fabric was immersed in the homogenous aerogel filled-paste and subsequently, two-roll padder with the speed of 1 m/min.
  • the fabric is then dried at ambient temperature and cured for 5 min at 150 °C.
  • the pressure of the padding process is 2 bar.
  • FIG. 2 shows sound absorption coefficient of the coated nonwoven fabric of EXAMPLE 1 for different sound frequencies.
  • the sound absorption coefficient of the coated nonwoven fabric increases with an increase in the frequency.
  • the highest sound absorption coefficient of 0.35 is obtained in a frequency of approximately 5000 Hz.
  • FIG. 3A illustrates a scanning electron microscope (SEM) image of the nonwoven fabric before being coated and
  • FIG. 3B illustrates an SEM image of the same nonwoven fabric coated with the aerogel -filled paste as was described in detail in connection with EXAMPLE 1.
  • SEM scanning electron microscope
  • FIG. 4 shows contact angle of a water droplet 401 on a surface 402 of the coated nonwoven fabric.
  • contact angle 403 is approximately 110.1° and contact angle 404 is approximately 111.4°.
  • An average contact angle of approximately 110.8° is obtained for the surface 402 of the coated nonwoven fabric of EXAMPLE 1, which indicates the hydrophobicity of the surface 402 of the coated nonwoven fabric.
  • a sound absorbing layer is synthesized pursuant to the teachings of the present disclosure.
  • Approximately 4 g of a silica aerogel synthesized from water-glass is added into 100 g of a foam-derived paste that contains 5 g of a urethane binding agent and 10 g of a fluorocarbon water repellent material.
  • the silica aerogel and the foam-derived paste are mixed in a mechanical stirrer under vigorous stirring for several minutes to form a homogenous aerogel filled-paste.
  • knife-over-screen method is used for coating the aerogel-filled paste on a polyester nonwoven fabric with 3 mm thickness. The fabric is then cured for 5 min at 170 °C.
  • FIG. 5 shows sound absorption coefficient of the coated nonwoven fabric of EXAMPLE 2 for different sound frequencies. Referring to FIG. 5, the sound absorption coefficient of the coated nonwoven fabric increases with an increase in the frequency. The highest sound absorption coefficients of 0.6-0.7 is obtained in a frequency range of approximately 2500-5000 Hz.
  • FIG. 6 shows contact angle of a water droplet 601 on a surface 602 of the coated nonwoven fabric. Referring to FIG. 6, contact angle 603 is approximately 110.1° and contact angle 604 is approximately 111.4°.
  • An average contact angle of approximately 110.8° is obtained for the surface 402 of the coated nonwoven fabric of EXAMPLE 2, which indicates a higher hydrophobicity of the surface 602 of the coated nonwoven fabric of EXAMPLE 2 in comparison to the hydrophobicity of the surface 402 of the coated nonwoven fabric of EXAMPLE 1 (labeled in FIG. 4).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Inorganic Chemistry (AREA)
  • Textile Engineering (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une couche absorbante acoustique. Le procédé peut comprendre la synthèse d'une poudre d'aérogel, la préparation d'une pâte de revêtement remplie d'un aérogel par mélange de l'aérogel synthétisé avec une pâte de revêtement, et l'application de la pâte de revêtement remplie d'un aérogel sur un substrat. La pâte de revêtement remplie d'un aérogel peut comprendre en outre un liant, un agent régulateur de la viscosité, et/ou un agent retardateur de flamme.
PCT/IB2018/053552 2017-09-19 2018-05-21 Fabrication de couches absorbantes acoustiques Ceased WO2019058185A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762560213P 2017-09-19 2017-09-19
US62/560,213 2017-09-19

Publications (1)

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WO2019058185A1 true WO2019058185A1 (fr) 2019-03-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200231826A1 (en) * 2017-10-04 2020-07-23 Hitachi Chemical Company, Ltd. Coating solution, method for producing coating film, and coating film
CN112550183A (zh) * 2020-12-16 2021-03-26 重庆千能实业有限公司 一种轻量化的降噪汽车前壁板

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997010188A1 (fr) * 1995-09-11 1997-03-20 Hoechst Research & Technology Deutschland Gmbh & Co. Kg Materiau composite a base d'aerogel contenant des fibres
CA2232628A1 (fr) * 1995-10-11 1997-04-17 Hoechst Research & Technology Deutschland Gmbh & Co. Kg Feuille revetue d'aerogel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997010188A1 (fr) * 1995-09-11 1997-03-20 Hoechst Research & Technology Deutschland Gmbh & Co. Kg Materiau composite a base d'aerogel contenant des fibres
CA2232628A1 (fr) * 1995-10-11 1997-04-17 Hoechst Research & Technology Deutschland Gmbh & Co. Kg Feuille revetue d'aerogel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200231826A1 (en) * 2017-10-04 2020-07-23 Hitachi Chemical Company, Ltd. Coating solution, method for producing coating film, and coating film
US11787957B2 (en) * 2017-10-04 2023-10-17 Resonac Corporation Coating solution, method for producing coating film, and coating film
CN112550183A (zh) * 2020-12-16 2021-03-26 重庆千能实业有限公司 一种轻量化的降噪汽车前壁板

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