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WO1997010188A1 - Materiau composite a base d'aerogel contenant des fibres - Google Patents

Materiau composite a base d'aerogel contenant des fibres Download PDF

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Publication number
WO1997010188A1
WO1997010188A1 PCT/EP1996/003961 EP9603961W WO9710188A1 WO 1997010188 A1 WO1997010188 A1 WO 1997010188A1 EP 9603961 W EP9603961 W EP 9603961W WO 9710188 A1 WO9710188 A1 WO 9710188A1
Authority
WO
WIPO (PCT)
Prior art keywords
composite material
binder
material according
airgel
fibers
Prior art date
Application number
PCT/EP1996/003961
Other languages
German (de)
English (en)
Inventor
Dierk Frank
Andreas Zimmermann
Original Assignee
Hoechst Research & Technology Deutschland Gmbh & Co. Kg
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 Hoechst Research & Technology Deutschland Gmbh & Co. Kg filed Critical Hoechst Research & Technology Deutschland Gmbh & Co. Kg
Priority to EP96931062A priority Critical patent/EP0850207A1/fr
Priority to JP51164697A priority patent/JP4118331B2/ja
Publication of WO1997010188A1 publication Critical patent/WO1997010188A1/fr
Priority to NO980991A priority patent/NO980991D0/no

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B30/00—Compositions for artificial stone, not containing binders
    • C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B26/12—Condensation polymers of aldehydes or ketones
    • C04B26/125—Melamine-formaldehyde condensation polymers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals

Definitions

  • the invention relates to a composite material which contains 5 to 97% by volume of airgel particles, at least one binder and at least one fiber material, the particle diameter of the airgel particles being ⁇ 0.5 mm, a process for its production and its use.
  • Aerogieie especially those with porosities above 60% and densities below 0.4 g / cm 3 , have an extremely low thermal conductivity due to their very low density, high porosity and small pore diameter and are therefore used as heat insulation materials, such as. B. describe in EP-AO 171 722.
  • the high porosity also leads to a low mechanical stability of both the gel from which the airgel is dried and the dried airgel itself.
  • Aerogy in the broader sense i.e. in the sense of "gel with air as a dispersing agent" are produced by drying a suitable gel.
  • airgel includes aerogeies in the narrower sense, xerogels and cryogels.
  • a dried gel is referred to as an airgel in the narrower sense if the liquid of the gel is largely removed at temperatures above the critical temperature and starting from pressures above the critical pressure. If, on the other hand, the liquid of the gel is removed subcritically, for example with the formation of a liquid-vapor boundary phase, the resulting gel is also referred to as a xerogel.
  • aerogeie in the present application is aerogeie in the broader sense, i.e. in the sense of "gel with air as a dispersant".
  • the molding process of the airgel is completed during the sol-gel transition.
  • the outer shape can only still be changed by crushing, for example grinding.
  • the material is too fragile for another form of stress.
  • DE-A 33 46 180 describes rigid plates made of pressed bodies on the basis of silica airgel obtained from flame pyrolysis in connection with reinforcement by mineral long fibers.
  • this silica airgel obtained from flame pyrolysis is not an airgel in the above sense, since it is not produced by drying a gel and thus has a completely different pore structure. It is mechanically more stable and can therefore be pressed without destroying the microstructure, but has a higher thermal conductivity than typical aerogeies in the above sense.
  • the surface of such compacts is very sensitive and must therefore be hardened by using a binder on the surface or protected by lamination with a film.
  • EP-A-0 340 707 describes an insulating material with a density of 0.1 to 0.4 g / cm 3 , which consists of at least 50% by volume silica airgel particles with a diameter between 0.5 and 5 mm, which are connected by means of at least one organic and / or inorganic binder. If the airgel particles are only connected at the contact surfaces via the binder, the resulting insulation material is not very stable mechanically, since the mechanical part of the airgel particle covered by the binder tears off, the particle is then no longer bound and the insulation material cracks receives. Therefore, if possible, all gussets between the airgel particles should be filled with the binder.
  • the resulting material is more stable than pure aeroge, but cracks can easily occur if not all of the granules are adequately enclosed by the binder.
  • a high volume fraction of airgel which is favorable for a low thermal conductivity, only small volume fractions of binder remain in the gusset areas, which has a low mechanical stability, in particular in the case of porous binders such as foams with low thermal conductivity. Filling all gusset areas with binder also leads to a greatly reduced sound absorption in the material due to the reduced macroscopic porosity (between the particles).
  • EP-A-489 319 discloses a composite foam with low thermal conductivity which comprises 20 to 80% by volume of silica airgel particles, 20 to 80% by volume of a styrene polymer foam of density 0 which envelops and connects the airgel particles , 01 to 0.15 g / cm 3 and optionally Contains usual additives in effective amounts.
  • the composite foam produced in this way is pressure-resistant, but not very resistant to bending at high concentrations of airgel particles.
  • German patent applications DE-A-44 30 669 and DE-A-44 30 642 plates or mats made of a fiber-reinforced airgel are described. Although these plates or mats have a very low thermal conductivity due to the very high proportion of airgel, their manufacture requires relatively long production times due to the diffusion problems described above.
  • a nonwoven airgel composite material which has at least one layer of nonwoven fabric and airgel particles, which is characterized in that the nonwoven fabric contains at least one bicomponent fiber material, the fibers of which are mutually and are connected to the airgel particles by the low-melting shell material.
  • This composite material has a relatively low thermal conductivity as well as a high macroscopic porosity and associated good sound insulation, but the use of bicomponent fibers limits the temperature range in which the material can be used and the fire protection class. Furthermore, the corresponding composites, in particular more complicated moldings, are not easy to manufacture.
  • One of the objects of the present invention was therefore to provide a composite material based on airgel granules which has a low thermal conductivity, is mechanically stable and is easy to produce.
  • Another object of the present invention was to provide a composite material based on airgel granules which additionally has good sound absorption.
  • the object is achieved by a composite material which contains 5 to 97% by volume of airgel particles, at least one binder and at least one fiber material, the particle diameter of the airgel particles being> 0.5 mm.
  • the binder either binds the fibers or aerogeies to one another or to one another, or else the binder serves as a matrix material in which the fibers and the airgel particles are embedded.
  • the connection of the fibers and the airgel particles to one another and to one another by means of the binder and, if appropriate, the embedding in a binder matrix leads to a mechanically stable material with low thermal conductivity.
  • the fibers can be natural or artificial, inorganic or organic fibers, e.g. Cellulose, cotton or flax fibers, glass or mineral fibers, polyester, polyamide or polyaramid fibers.
  • the fibers can be new or from waste such as e.g. shredded glass fiber waste or rags. The use of bicomponent fibers is also possible.
  • the fibers can be smooth or crimped as individual fibers, as a bulk or as a non-woven or woven fabric.
  • Nonwovens and / or fabrics can be a coherent whole and / or in the form of several small pieces in the Composite may be included.
  • the fibers can have round, trilobal, pentalobal, octalobal, ribbon, fir tree, barbell or other star-shaped profiles. Hollow fibers can also be used.
  • the diameter of the fibers used in the composite should preferably be smaller than the average diameter of the airgel particles in order to be able to bind a high proportion of airgel in the composite.
  • the choice of very thin fibers makes the composite more flexible.
  • Fibers with a diameter between 1 ⁇ m and 1 mm are preferably used. With a fixed volume fraction of fibers, the use of narrow diameters typically leads to more break-resistant composite materials.
  • the length of the fibers is in no way limited. Preferably, however, the length of the fibers should be greater than the average diameter of the airgel particles, i.e. at least 0.5 mm.
  • the stability as well as the thermal conductivity of the composite material increases with increasing fiber content.
  • the volume fraction of the fibers should preferably be between 0.1 and 40% by volume, particularly preferably in the range between 0.1 and 15% by volume.
  • the fibers can also be coated with sizes or contact agents (coupling agents), e.g. usual for glass fibers.
  • Suitable aerogies for the composite materials according to the invention are those based on metal oxides which are suitable for the sol-gel technique (see, for example, CJ. Brinker, GW Scherer, Sol-Gel-Science, 1990, chap. 2 and 3), such as Si or Al compounds or those based on organic substances which are suitable for sol-gel technology, such as, for example, melamine formaldehyde condensates (US Pat. No. 5,086,085) or resorcinol formaldehyde condensates (US Pat. 4, 873.218). However, they can also be based on mixtures of the above materials. Aerogies containing Si compounds are preferably used, particularly preferably aerogies containing SiO 2 , in particular SiO 2 aerogels, which are optionally organically modified.
  • the airgel IR opacifier e.g. Contain carbon black, titanium dioxide, iron oxide, zirconium dioxide or mixtures thereof.
  • the thermal conductivity of the aerogeie decreases with increasing porosity and decreasing density, to a density in the range of 0.1 g / cm 3 .
  • aerogels with porosities above 60% and densities between 0.1 and 0.4 g / cm 3 are preferred.
  • the thermal conductivity of the airgel granules should preferably be less than 40 mW / mK, particularly preferably less than 25 mW / mK.
  • hydrophobic airgel particles are used, which can be obtained by introducing hydrophobic surface groups on the pore surfaces of the aerogie during or after the production of the aerogeie.
  • airgel particles is intended to refer to particles which are either monolithic, ie consist of one piece, or which essentially contain airgel particles with a diameter smaller than that of the particle, which can be replaced by a suitable Binders are connected and / or are pressed together to form a larger particle.
  • the size of the grains depends on the application of the material. In order to achieve high stability, the granules should not be too coarse-grained, preferably the diameter of the grains should be less than 1 cm and particularly preferably less than 5 mm.
  • the diameter of the airgel particles should be larger than 0.5 mm, in order to avoid the very difficult handling of a very fine, low-density powder during manufacture. Furthermore, during processing, liquid binder usually penetrates into the upper layers of the airgel, which loses its high insulating effect in this area. Therefore, the ratio of macroscopic particle surface to particle volume should be as small as possible, which would not be the case with too small particles.
  • the volume fraction of the airgel should preferably be between 20 and 97% by volume, particularly preferably between 40 and 95% by volume, high volume proportions resulting in lower thermal conductivity and Lead strength.
  • air pores should also be present in the material, for which purpose the volume fraction of the airgel should preferably be below 85% by volume.
  • Granules with a favorable bimodal grain size distribution can preferably be used to achieve high airgel volume fractions. Depending on the application, e.g. in the field of sound insulation, other distributions can also be used.
  • the fibers or airgel particles with one another and fibers and airgel particles with one another are connected by at least one binder.
  • the binder can either only connect the fibers and airgel particles to one another and to one another or serve as a matrix material.
  • all known binders are suitable for producing the composite materials according to the invention.
  • Inorganic binders such as water glass glue, or organic binders or mixtures thereof can be used.
  • the binder can additionally contain further inorganic and / or organic constituents.
  • Suitable organic binders are e.g. thermoplastics, e.g. Polyolefins or polyolefin waxes, styrene polymers, polyamides, ethylene-vinyl acetate copolymers or blends thereof, or thermosetting plastics such as phenol, resorcinol, urea or melamine resins.
  • Adhesives such as hot melt adhesives, dispersion adhesives (in aqueous form, e.g. styrene-butadiene and styrene-acrylic ester copolymers), solvent-based adhesives or plastisols can also be used; reaction adhesives are also suitable, e.g.
  • thermosetting epoxy resins such as thermosetting epoxy resins, formaldehyde condensates, polyimides, polybenzimidazoles, cyanoacrylates, polyvinyl butyrals, polyvinyl alcohols, anaerobic adhesives, polyurethane adhesives and moisture-curing silicones
  • two-component systems such as methacrylic and epoxy resins, cold curing, cold curing.
  • Polyvinyl butyrals and / or polyvinyl alcohols are preferably used.
  • the binder should preferably be chosen so that, if it is in liquid form in certain phases of processing, it cannot penetrate into this very porous airgel, or can penetrate it only insignificantly.
  • the penetration of the binder into the interior of the airgel particles can also be influenced by regulating the process conditions, such as pressure, temperature and mixing time.
  • porous materials are advantageously used because of their low thermal conductivity Densities less than 0.75 g / cm 3, such as foams, preferably polymer foams (eg polystyrene or polyurethane foams), are used.
  • the binder In order to achieve a good distribution of the binder in the gusset cavities with a high proportion of airgel and as good a bonding as possible, the binder should preferably be smaller than that of the airgel granules in the case that the binder is in solid form. Processing at elevated pressure may also be necessary.
  • the binder must be chosen so that its melting temperature does not exceed the melting temperature of the fibers.
  • the binder is generally used in an amount of 1 to 50% by volume of the composite material, preferably in an amount of 1 to 30% by volume.
  • the choice of binder depends on the mechanical and thermal requirements for the composite and the requirements with regard to fire protection.
  • the composite can contain other additives such as e.g. Contain dyes, pigments, fillers, flame retardants, synergists for flame retardants, antistatic agents, stabilizers, plasticizers and IR opacifiers.
  • additives such as e.g. Contain dyes, pigments, fillers, flame retardants, synergists for flame retardants, antistatic agents, stabilizers, plasticizers and IR opacifiers.
  • the composite material can contain additives which are used for its production or are produced during the production, e.g. Lubricants for pressing, such as zinc stearate, or the reaction products of acidic or acid-releasing hardening accelerators when using resins.
  • Lubricants for pressing such as zinc stearate
  • reaction products of acidic or acid-releasing hardening accelerators when using resins e.g.
  • the fire class of the composite material is determined by the fire class of the airgel, the fibers and the binder, as well as other substances which may be present.
  • non-flammable fiber types such as glass or mineral fibers, or flame-retardant fiber types such as TREVIRA CS® or melamine resin fibers
  • aerogels on an inorganic basis, particularly preferably on the basis of SiO 2 and flame-retardant binders should preferably be used such as inorganic binders or urea and melamine formaldehyde resins, silicone resin adhesives, polyimide and polybenzimidazole resins can be used.
  • the material is in the form of flat structures, e.g. Sheets or mats used, it can be laminated on at least one side with at least one cover layer to improve the properties of the surface, e.g. to increase the robustness, to design it as a vapor barrier or to protect it against easy contamination.
  • the cover layers can also improve the mechanical stability of the composite molding. If cover layers are used on both surfaces, they can be the same or different.
  • cover layers All materials known to the person skilled in the art are suitable as cover layers. They can be non-porous and thus act as a vapor barrier, e.g. Plastic foils, preferably metal foils or metallized plastic foils, which reflect thermal radiation. However, porous cover layers can also be used, which allow air to penetrate the material and thus lead to better sound absorption, e.g. porous foils, papers, fabrics or fleeces.
  • the cover layers themselves can also consist of several layers.
  • the cover layers can be fastened with the binder, by means of which the fibers and the airgel particles are connected to one another and to one another, but another adhesive can also be used.
  • the surface of the composite material can also be closed and solidified by introducing at least one suitable material into a surface layer.
  • suitable materials are, for example, thermoplastic polymers such as polyethylene and polypropylene, or resins such as melamine formaldehyde resins.
  • the composite materials according to the invention preferably have thermal conductivities between 10 and 100 mW / mK, particularly preferably in the range from 10 to 50 mW / mK, in particular in the range from 15 to 40 mW / mK.
  • Another object of the present invention was to provide a method for producing the composite material according to the invention.
  • the composite material can be obtained, for example, as follows: airgel particles, fiber material and binder are mixed with conventional mixing devices. This mixture is then shaped. Depending on the type of binder, the mixture is cured in the mold, if necessary under pressure by heating, for example in the case of reactive adhesives, or in the case of hotmelt adhesives by heating above the melting point of the binder.
  • a material that is porous on a macroscale can be obtained in particular by the following method: If the fibers are not already in a bulked form (for example small balls of cut fibers or small pieces of a fleece), they are processed into small balls using methods known to those skilled in the art. In this step, the airgel granulate can be placed between the fibers if necessary. These balls are then mixed together with the binder and, if appropriate, the airgel particles, for example in a mixer, until the binder and, if appropriate, airgel particles have distributed as evenly as possible between the fibers.
  • a bulked form for example small balls of cut fibers or small pieces of a fleece
  • the mass is then placed in a mold and optionally heated under pressure to a temperature which is above the melting temperature of the adhesive in the case of hot melt adhesives and above the temperature required for the reaction in the case of reactive adhesives. After the binder has melted is or has reacted, the material is cooled. Polyvinyl butyrals are preferably used here. The density of the composite material can be increased by using higher pressures.
  • the mixture is pressed. It is possible for the person skilled in the art to select the suitable press and the suitable pressing tool for the respective application. If necessary, lubricants known to the person skilled in the art, such as e.g. Zinc stearate in melamine formaldehyde resins can be added.
  • the use of vacuum presses is advantageous due to the high air content of the airgel-containing molding compounds.
  • the airgel-containing molding compounds are pressed into sheets.
  • the airgel-containing mixture to be compressed can be mixed with a separating aid, e.g. Release paper against which the ram is cut.
  • the mechanical strength of the airgel-containing plates can be improved by laminating screen fabrics, nonwovens or papers onto the plate surface.
  • the screen fabrics, nonwovens or papers can be applied subsequently to the airgel-containing plates, whereby the screen fabrics, nonwovens or papers can be impregnated beforehand, for example with a suitable binder or adhesive, and then bonded to the plate surfaces in a heatable press under pressure , as well as, in a preferred embodiment, in one working step by inserting the sieve cloth, nonwovens or papers, which can optionally be impregnated beforehand with a suitable binder or adhesive, into the mold and placing on the airgel-containing molding compound to be pressed and then pressing under pressure and temperature to an airgel-containing composite panel.
  • the pressing generally takes place in any form at pressures from 1 to 1000 bar and temperatures from 0 to 300 ° C.
  • the pressing preferably takes place at pressures from 5 to 50 bar, particularly preferably 10 to 20 bar and temperatures preferably from 100 to 200 ° C., particularly preferably 130 to 190 ° C. and in particular between 150 and 175 ° C in any shape.
  • the composite can be obtained, for example, as follows: the airgel particles and the fiber material are mixed with conventional mixing devices. The mixture thus obtained is then coated with the binder, e.g. by spraying, placed in a mold and cured in the mold. Depending on the type of binder, the mixture is cured, if appropriate under pressure, by heating and / or evaporating the solvent or dispersion medium used. The airgel particles are preferably swirled with the fibers in a gas stream. A mold is filled with the mixture, the binder being sprayed on during the filling process. A material that is porous on a macroscale can be obtained in particular by the following process: If the fibers are not already in bulk (e.g.
  • small balls of cut fibers or small pieces of a fleece they are processed into small balls using methods known to those skilled in the art.
  • the airgel granulate can be placed between the fibers if necessary. Otherwise, these balls are then together with the airgel granules e.g. mixed in a mixer until the airgel particles have spread as evenly as possible between the fibers.
  • the binder is sprayed as finely as possible onto the mixture, which is then brought in a mold, if necessary under pressure, to the temperature necessary for the binding.
  • the composite is then dried using conventional methods.
  • the composite material can also be produced as follows, depending on the type of foam. If the foam is produced by expanding expandable granules in a form as in the case of expanded polystyrene, all components are intimately mixed and then typically heated, advantageously by means of hot air or steam. The resulting expansion of the particles increases the pressure in the mold, as a result of which the gusset volume is filled by the foam and the airgel particles are fixed in the composite. After cooling, the composite molded part is removed from the mold and optionally dried.
  • the fibers can be mixed into the liquid.
  • the airgel particles are mixed with the resulting liquid, which then foams.
  • the material is to be provided with a cover layer, this can be inserted into the mold, for example, before or after filling, so that the lamination and shaping can take place in one work step, the composite binder preferably being the binding agent for the lamination is used. However, it is also possible to provide the composite with a cover layer afterwards.
  • the shape of the molded part, which consists of the composite material according to the invention, is in no way limited; in particular, the composite can be brought into sheet form.
  • the composites are very suitable for thermal insulation.
  • the composite can be used, for example in the form of plates, as sound absorption material directly or in the form of resonance absorbers for sound insulation.
  • macroscopic pores cause additional damping Air friction on these macroscopic pores in the composite material.
  • the macroscopic porosity can be influenced by changing the fiber proportion and diameter, grain size and proportion of the airgel particles and type of binder. The frequency dependence and size of the sound attenuation can be changed in a manner known to the person skilled in the art via the choice of the cover layer, the thickness of the plate and the macroscopic porosity.
  • the composite materials according to the invention are also suitable as adsorption materials for liquids, vapors and gases.
  • Moldings made of airgel, polyvinyl butyral and fibers
  • the hydrophobic airgel granulate has an average grain size in the range of 1 to 2 mm, a density of 120 kg / m 3 , a BET surface area of 620 m 2 / g and a thermal conductivity of 11 mW / mK.
  • the bottom of the mold with a base area of 30 cm x 30 cm is lined with release paper.
  • the airgel-containing molding compound is then evenly distributed and the whole thing is covered with a release paper. It is pressed at 220 ° C for 30 minutes to a thickness of 18 mm.
  • the molded body obtained has a density of 269 kg / m 3 and a thermal conductivity of 20 mW / mK.
  • Moldings made from airgel, polyvinyl butyral and recycled fibers
  • the bottom of the mold with a base area of 30 cm x 30 cm is lined with release paper.
  • the airgel-containing molding compound is then evenly distributed and the whole thing is covered with a release paper. It is pressed at 220 ° C for 30 minutes to a thickness of 18 mm.
  • the molded body obtained has a density of 282 kg / m 3 and a thermal conductivity of 25 mW / mK.
  • Moldings made from airgel, polyvinyl butyral and recycled fibers
  • the bottom of the mold with a base area of 30 cm x 30 cm is lined with release paper.
  • the airgel-containing molding compound is then evenly distributed and the whole thing is covered with a release paper. It is pressed at 220 ° C for 30 minutes to a thickness of 18 mm.
  • the molded body obtained has a density of 420 kg / m 3 and a thermal conductivity of 55 mW / mK.
  • Molded body made of airgel, polyethylene wax and fibers
  • the bottom of the mold with a base area of 12 cm x 12 cm is lined with release paper.
  • the airgel-containing molding compound is then evenly distributed and the whole thing is covered with a release paper. It is pressed at 170 C C with a pressure of 70 bar for 30 minutes.
  • the molded body obtained has a thermal conductivity of 25 mW / mK.
  • Shaped body made of airgel, polyethylene wax and fibers
  • hydrophobic airgel granules from Example 1 50% by weight of hydrophobic airgel granules from Example 1, 48% by weight of polyethylene wax powder from Hoechst wax PE 520 and 2% by volume of ®Trevira high-strength fibers are intimately mixed.
  • the bottom of the mold with a base area of 12 cm x 12 cm is lined with release paper.
  • the airgel-containing molding compound is then evenly distributed and the whole thing is covered with a release paper. It is pressed at 180 ° C with a pressure of 70 bar for 30 minutes.
  • the molded body obtained has a thermal conductivity of 28 mW / mK.
  • Molded body made of airgel, polyvinyl alcohol and fibers
  • the polyvinyl alcohol solution consists of 10% by weight ®Mowiol type 40-88, 45% by weight water and 45% by weight ethanol.
  • the bottom of the mold with a base area of 12 cm x 12 cm is lined with release paper.
  • the airgel-containing molding compound is then evenly distributed and the whole is pressed at 70 bar for 2 minutes and then dried.
  • the molded body obtained has a thermal conductivity of 24 mW / mK.
  • the thermal conductivity of the airgel granules was measured using a heating wire method (see, for example, O. Nielsson, G. Haischenpöhler, J. subject, J. Fricke, High Temperatures - High Pressures, Vol. 21, 274-274 (1989)).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)
  • Porous Artificial Stone Or Porous Ceramic Products (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Silicon Compounds (AREA)
  • Paper (AREA)
  • Thermal Insulation (AREA)

Abstract

L'invention concerne un matériau composite contenant entre 5 et 97 % en volume de particules d'aérogel, au moins un liant et au moins un matériau fibreux. Le diamètre des particules d'aérogel est ≥ 0,5 mm. L'invention concerne par ailleurs un procédé permettant de produire ledit matériau composite, ainsi que son utilisation.
PCT/EP1996/003961 1995-09-11 1996-09-10 Materiau composite a base d'aerogel contenant des fibres WO1997010188A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP96931062A EP0850207A1 (fr) 1995-09-11 1996-09-10 Materiau composite a base d'aerogel contenant des fibres
JP51164697A JP4118331B2 (ja) 1995-09-11 1996-09-10 繊維を含有するエーロゲル複合材料
NO980991A NO980991D0 (no) 1995-09-11 1998-03-06 Fiberholdige aerogel-komposittmaterialer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19533564A DE19533564A1 (de) 1995-09-11 1995-09-11 Faserhaltiges Aerogel-Verbundmaterial
DE19533564.3 1995-09-11

Publications (1)

Publication Number Publication Date
WO1997010188A1 true WO1997010188A1 (fr) 1997-03-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/003961 WO1997010188A1 (fr) 1995-09-11 1996-09-10 Materiau composite a base d'aerogel contenant des fibres

Country Status (8)

Country Link
EP (1) EP0850207A1 (fr)
JP (1) JP4118331B2 (fr)
KR (1) KR19990044531A (fr)
CN (1) CN1104393C (fr)
CA (1) CA2231428A1 (fr)
DE (1) DE19533564A1 (fr)
NO (1) NO980991D0 (fr)
WO (1) WO1997010188A1 (fr)

Cited By (17)

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WO1998050144A1 (fr) * 1997-05-02 1998-11-12 Cabot Corporation Procede de granulation d'aerogels
WO1998050145A1 (fr) * 1997-05-02 1998-11-12 Cabot Corporation Procede de compactage d'aerogels
JP2001517004A (ja) * 1997-09-05 2001-10-02 １… アイピーアール リミテッド 多泡凝集体、圧電気装置、及びその用途
US6378229B1 (en) 1997-12-19 2002-04-30 Cabot Corporation Method for the sub-critical drying of lyogels to produce aerogels
US7297718B2 (en) 1998-01-14 2007-11-20 Cabot Corporation Method of producing substantially spherical lyogels in water insoluble silylating agents
WO2007012618A3 (fr) * 2005-07-27 2007-03-22 Basf Ag Film non-tisse en resine aminoplaste utilise pour revetir des substrats
EP2281962B1 (fr) 2009-06-25 2017-04-05 Knauf Insulation Aérogel contenant des matériaux composites
US8937106B2 (en) 2010-12-07 2015-01-20 Basf Se Melamine resin foams with nanoporous fillers
WO2012076489A1 (fr) 2010-12-07 2012-06-14 Basf Se Matériau composite contenant des particules nanoporeuses
WO2012076492A1 (fr) 2010-12-07 2012-06-14 Basf Se Mousses de résine de mélamine contenant des matières de charge nanoporeuses
WO2012076506A1 (fr) 2010-12-07 2012-06-14 Basf Se Matériau composite de polyuréthane
WO2013182506A1 (fr) 2012-06-04 2013-12-12 Basf Se Matériau composite polyuréthane contenant de l'aérogel
US9944793B2 (en) 2012-06-04 2018-04-17 Basf Se Aerogel-containing polyurethane composite material
US11333288B2 (en) 2015-01-27 2022-05-17 Showa Denko Materials Co., Ltd. Aerogel laminate and thermal insulation material
WO2019058185A1 (fr) * 2017-09-19 2019-03-28 Mazrouei Sebdani Zahra Fabrication de couches absorbantes acoustiques
US11787957B2 (en) 2017-10-04 2023-10-17 Resonac Corporation Coating solution, method for producing coating film, and coating film
US11547977B2 (en) 2018-05-31 2023-01-10 Aspen Aerogels, Inc. Fire-class reinforced aerogel compositions
US12005413B2 (en) 2018-05-31 2024-06-11 Aspen Aerogels, Inc. Fire-class reinforced aerogel compositions
US12409428B2 (en) 2018-05-31 2025-09-09 Aspen Aerogels, Inc. Fire-class reinforced aerogel compositions
US20220347967A1 (en) * 2019-11-07 2022-11-03 Ha Sangsun Heat insulation material comprising aerogel granules and manufacturing method therefor
US11897246B2 (en) * 2019-11-07 2024-02-13 Ha Sangsun Heat insulation material comprising aerogel granules and manufacturing method therefor

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DE19533564A1 (de) 1997-03-13
CN1196036A (zh) 1998-10-14
CN1104393C (zh) 2003-04-02
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KR19990044531A (ko) 1999-06-25
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EP0850207A1 (fr) 1998-07-01
NO980991D0 (no) 1998-03-06

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