EP1192398B1 - Insulating plate, especially for the low temperature range - Google Patents
Insulating plate, especially for the low temperature range Download PDFInfo
- Publication number
- EP1192398B1 EP1192398B1 EP00938801A EP00938801A EP1192398B1 EP 1192398 B1 EP1192398 B1 EP 1192398B1 EP 00938801 A EP00938801 A EP 00938801A EP 00938801 A EP00938801 A EP 00938801A EP 1192398 B1 EP1192398 B1 EP 1192398B1
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- EP
- European Patent Office
- Prior art keywords
- insulating plate
- desiccant
- insulating
- water vapor
- temperature range
- 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.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/06—Walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2201/00—Insulation
- F25D2201/10—Insulation with respect to heat
- F25D2201/14—Insulation with respect to heat using subatmospheric pressure
Definitions
- the invention relates to an insulating plate, in particular for the low temperature range, which is resistant to existing and / or later occurring water vapor and / or other gases.
- a plate is known from US-A-4 636 416 or DE-A-4 106 727.
- Such insulating plates are used in cooling systems, refrigerators or refrigeration devices.
- Polyurethane or polystyrene foams are often used for this, which have a thermal conductivity of approx. 0.03 W / mK at normal pressure.
- microporous insulation materials have a thermal conductivity of approximately 0.02 W / mK, since the minimum pore size achieved in the nano range considerably reduces the path length of the air molecules and thus the thermal conductivity.
- the microporous powder as packing material is packed in an airtight envelope, so that the water vapor transport rate (WVTR) and the oxygen permeability or - Transport rate (OTR) are as low as possible, since otherwise the thermal conductivity increases considerably due to the absorption of water vapor or oxygen due to the falling degree of evacuation, and the insulation property can thus be lost within a few weeks within a technically useful range.
- WVTR water vapor transport rate
- OTR oxygen permeability or - Transport rate
- the service life of insulating plates depends on the fact that water vapor and gases are prevented from penetrating through the covering into the insulating plate.
- the penetration of water vapor, air humidity or gases into the insulating plate reduces the vacuum and thus the insulating ability.
- plastic films, metal-coated plastic films or metal foils are used as wrapping. From the point of view of barrier against the ingress of water vapor, metal foils, especially aluminum foils, would be preferable to other materials. However, metals have a very high thermal conductivity, so that the insulating effect of the insulating plate is reduced by the covering.
- Aluminum has e.g. B. an approx. 20,000 to 100,000 times higher thermal conductivity than the filling materials commonly used in insulating plates. Compared to plastic materials, aluminum foils are approx. 1,000 times higher.
- plastic foils must be used to maintain the good insulating ability of the insulating plate, but they have the disadvantage of higher permeability to water vapor and gases compared to metal foils. For this reason, metal-coated plastic films are mostly used for the wrapping of insulating panels. However, their thermal conductivity is still significantly higher than that of pure plastic films. Metal-coated plastic films also pose another problem for disposal after their use. In order to dispose of them as single types guarantee, metal and plastic must be separated.
- the desiccant used is in powder form, which is mixed with the microporous filler materials (fine-particle metal oxides, optionally with fibrous materials and opacifiers), pressed and coated. This will not additional manufacturing step is required, as is the case for the introduction of commercially available getters.
- the main advantage of a desiccant for use in insulating panels is its long-term effect.
- the desiccant contained in the insulating plates will have its effect as long as there is still unused material in the filling material. Only then would the natural water vapor absorption capacity of the filler, e.g. B. silicon aerogels claimed.
- the desiccant is finely divided in the insulating plates and is not locally concentrated as is the case with a getter. As a result, a penetration of water vapor which is uniformly carried out over the entire insulating plate is achieved.
- a plastic film can be used with its thermal conductivity, which is about 1000 times higher than that of metal films.
- thermal conductivity is about 1000 times higher than that of metal films.
- the lower thermal conductivity compared to metal foils and thus the better insulating ability of the plastic film can be exploited without fear that the insulating ability of the insulating plate will decrease over time due to the penetration of gases and / or water vapor.
- Suitable drying agents for an insulating plate according to the invention are all drying agents which are solid and powdery, in particular in the low-temperature range, and which form a permanent chemical connection with water vapor. Desiccants that can not only absorb water vapor but also gases are also suitable.
- Calcium oxide (CaO) is used as a particularly preferred drying agent. Calcium oxide (quicklime or quicklime) forms calcium hydroxide (Ca (OH) 2 ) with water. This is an inert solid, which due to adsorption processes can bind more water than would be expected according to the stoichiometric conditions. Calcium oxide is readily available, not expensive and does not pose any problems when disposing of the insulating plate, just like calcium hydroxide.
- desiccants that can be used in the insulating plate according to the invention are e.g. B. phosphorus pentoxide (P 2 O 5 ), calcium hydride (CaH), aluminum oxide (Al 2 O 3 ) or potassium carbonate (K 2 CO 3 ).
- P 2 O 5 phosphorus pentoxide
- CaH calcium hydride
- Al 2 O 3 aluminum oxide
- K 2 CO 3 potassium carbonate
- Preferably used finely divided metal oxides are pyrogenic silicas, including arcing silicas, low alkali precipitated silicas, silicon oxide aerogels, similarly produced aluminum oxides and mixtures thereof. Silicon oxide aerogels are particularly preferred.
- opacifiers are titanium dioxide, ilmenite, zirconium dioxide and zirconium silicate and mixtures thereof. Prefers titanium dioxide is used.
- fiber materials are ceramic fibers, glass wool and rock wool, glass fibers being preferred.
- finely ground calcium oxide (CaO) is added, since this "burnt lime” known from the building materials industry is available very inexpensively.
Abstract
Description
Die Erfindung bezieht sich auf eine Isolierplatte, insbesondere für den Niedertemperaturbereich, die gegen vorhandenen und/oder später eintretenden Wasserdampf und/oder andere Gase beständig ist. Eine derartige Platte ist aus der US-A-4 636 416 oder der DE-A-4 106 727 bekannt.
Derartige Isolierplatten werden bei Kühlanlagen, Kühlschränken oder kältetechnischen Geräten eingesetzt. Häufig werden hierzu noch Polyurethan- oder Polystyren-Schäume verwendet, die bei Normaldruck eine Wärmeleitfähigkeit von ca. 0,03 W/mK aufweisen. Demgegenüber weisen mikroporöse Dämmstoffe eine Wärmeleitfähigkeit von etwa 0,02 W/mK auf, da die damit erreichte minimale Porengröße im Nanobereich die Weglänge der Luftmoleküle und damit die Wärmeleitung erheblich reduziert. Dieser Effekt kann noch verbessert werden, wenn derartige Dämmstoffe auf beispielsweise 10 mbar oder darunter evakuiert werden. Hierzu wird das mikroporöse Pulver als Füllmaterial in eine möglichst luftdichte Umhüllung gepackt, so daß die Wasserdampf-Transportrate (WVTR) und die Sauerstoffdurchlässigkeit bzw.
- transportrate (OTR) möglichst gering sind, da ansonsten die Wärmeleitfähigkeit durch die Aufnahme von Wasserdampf bzw. Sauerstoff aufgrund des fallenden Evakuierungsgrades erheblich zunimmt und die Isoliereigenschaft somit innerhalb weniger Wochen im technisch brauchbaren Rahmen verlorengehen kann.The invention relates to an insulating plate, in particular for the low temperature range, which is resistant to existing and / or later occurring water vapor and / or other gases. Such a plate is known from US-A-4 636 416 or DE-A-4 106 727.
Such insulating plates are used in cooling systems, refrigerators or refrigeration devices. Polyurethane or polystyrene foams are often used for this, which have a thermal conductivity of approx. 0.03 W / mK at normal pressure. In contrast, microporous insulation materials have a thermal conductivity of approximately 0.02 W / mK, since the minimum pore size achieved in the nano range considerably reduces the path length of the air molecules and thus the thermal conductivity. This effect can be further improved if such insulation materials are evacuated to, for example, 10 mbar or below. For this purpose, the microporous powder as packing material is packed in an airtight envelope, so that the water vapor transport rate (WVTR) and the oxygen permeability or
- Transport rate (OTR) are as low as possible, since otherwise the thermal conductivity increases considerably due to the absorption of water vapor or oxygen due to the falling degree of evacuation, and the insulation property can thus be lost within a few weeks within a technically useful range.
Bei der Produktion derartiger mikroporöser Isolierplatten bleibt trotz Verwendung trockenster Materialien jedoch noch eine Restfeuchte bis ca. 3 % erhalten. Diese stammt unter anderem aus der Feuchtigkeit der Umgebungsluft. Für das Evakuieren der Luft zur Erzielung des gewünschten Vakuums wird bei Vorhandensein einer gewissen Feuchtigkeit im mikroporösen Füllmaterial sehr viel Zeit benötigt, um ein ausreichendes Vakuum für Isolierzwecke (ca. 1 - 10 mbar) zu erzielen, da das vorhandene Wasser möglichst vollständig entfernt werden muß.In the production of such microporous insulating plates, a residual moisture of up to approx. 3% remains despite the use of the driest materials. Among other things, this comes from the humidity of the ambient air. For the evacuation of the air to achieve the desired vacuum, a certain amount of time is required in the presence of a certain moisture in the microporous filling material in order to achieve a sufficient vacuum for insulation purposes (approx. 1-10 mbar), since the water present must be removed as completely as possible ,
Ein weiteres Problem stellt sich bei der Lagerung der verfüllten, aber noch nicht evakuierten Isolierplatten. Diese nehmen aus der Umgebungsluft Feuchtigkeit auf, so daß die benötigte Zeit für die Evakuierung nach einer gewissen Lagerzeit stark ansteigt.Another problem arises when storing the filled but not yet evacuated insulating plates. These absorb moisture from the ambient air, so that the time required for evacuation increases sharply after a certain storage period.
Weiterhin ist die Lebensdauer von Isolierplatten abhängig davon, daß Wasserdampf und Gase von dem Eindringen durch die Umhüllung hindurch in die Isolierplatte abgehalten werden. Durch das Eindringen von Wasserdampf, Luftfeuchtigkeit oder Gasen in die Isolierplatte nimmt das Vakuum und damit die Isolierfähigkeit ab.Furthermore, the service life of insulating plates depends on the fact that water vapor and gases are prevented from penetrating through the covering into the insulating plate. The penetration of water vapor, air humidity or gases into the insulating plate reduces the vacuum and thus the insulating ability.
Das Problem des Eindringens von Wasserdampf, Feuchtigkeit und/oder Gasen in Isolierplatten wird bis jetzt zumeist über die Wahl der Umhüllung gelöst. In der Regel werden Kunststoffolien, metallbeschichtete Kunststoffolien oder Metallfolien als Umhüllung verwendet. Von dem Gesichtspunkt der Barrierefähigkeit gegen das Eindringen von Wasserdampf aus betrachtet, wären Metallfolien, insbesondere Aluminiumfolien, anderen Materialien vorzuziehen. Metalle weisen jedoch eine sehr hohe Wärmeleitfähigkeit auf, so daß der Isoliereffekt der Isolierplatte durch die Umhüllung reduziert wird. Aluminium hat z. B. eine ca. 20.000 bis 100.000 mal höhere Wärmeleitfähigkeit als die in Isolierplatten üblichen verwendeten Füllmaterialien. Gegenüber Kunststoffmaterialien liegen Aluminiumfolien um ca. den Faktor 1.000 darüber. Dies bedeutet, daß zur Erhaltung der guten Isolierfähigkeit der Isolierplatte Kunststoffolien verwendet werden müssen, die aber gegenüber Metallfolien den Nachteil der höheren Durchlässigkeit von Wasserdampf und Gasen aufweisen. Zumeist werden deshalb metallbeschichtete Kunststoffolien für die Umhüllung von Isolierplatten verwendet. Deren Wärmeleitfähigkeit liegt jedoch immer noch erheblich über der von reinen Kunststoffolien. Ein weiteres Problem bieten metallbeschichtete Kunststoffolien auch für die Entsorgung nach ihrer Verwendung. Um eine sortenreine Entsorgung zu gewährleisten, müssen Metall und Kunststoff voneinander getrennt werden.The problem of the penetration of water vapor, moisture and / or gases in insulating plates has so far mostly been solved by the choice of the covering. As a rule, plastic films, metal-coated plastic films or metal foils are used as wrapping. From the point of view of barrier against the ingress of water vapor, metal foils, especially aluminum foils, would be preferable to other materials. However, metals have a very high thermal conductivity, so that the insulating effect of the insulating plate is reduced by the covering. Aluminum has e.g. B. an approx. 20,000 to 100,000 times higher thermal conductivity than the filling materials commonly used in insulating plates. Compared to plastic materials, aluminum foils are approx. 1,000 times higher. This means that plastic foils must be used to maintain the good insulating ability of the insulating plate, but they have the disadvantage of higher permeability to water vapor and gases compared to metal foils. For this reason, metal-coated plastic films are mostly used for the wrapping of insulating panels. However, their thermal conductivity is still significantly higher than that of pure plastic films. Metal-coated plastic films also pose another problem for disposal after their use. In order to dispose of them as single types guarantee, metal and plastic must be separated.
Ein anderer Ansatz zur Lösung des Problems des Eindringens von Wasserdampf und Gasen wird über das Einbringen eines Getters gesucht. Nachteil dieser Lösung ist jedoch, daß die handelsüblichen Getter sehr teuer sind, da als Gettermaterialien in der Regel Zirkonium-Vanadium-Eisen-Legierungen oder Zirkonium-Aluminium-Legierungen dienen. Außerdem bringen diese Getter den Nachteil mit sich, daß sich diese in einem extra Behältnis befinden, das in die Isolierplatte integriert werden muß. Um eine flächendeckende Wirkung zu erzielen, müssen zumindest mehrere dieser Getter in die Isolierplatte eingebracht werden. Neben dem Kostenfaktor bringt das Einbringen von Gettern noch Herstellungsprobleme mit sich, da nicht nur die Füllmaterialien miteinander vermischt, verpreßt und umhüllt werden müssen, sondern auch noch die tabletten- oder kapselförmigen Getter in gesonderten Schritten eingebracht werden müssen. Insbesondere bei sehr dünnen Isolierplatten kommt noch zusätzlich das Problem hinzu, daß die Dimensionen sehr gering sind und die Integration der Getter in diese dünnen Isolierplatten schwierig ist.Another approach to solving the ingress of water vapor and gases is sought through the introduction of a getter. However, the disadvantage of this solution is that the commercially available getters are very expensive, since zirconium-vanadium-iron alloys or zirconium-aluminum alloys are generally used as getter materials. In addition, these getters have the disadvantage that they are located in an extra container that has to be integrated into the insulating plate. In order to achieve a nationwide effect, at least several of these getters must be introduced into the insulating plate. In addition to the cost factor, the introduction of getters also involves manufacturing problems, since not only do the filling materials have to be mixed, pressed and coated, but also the tablet-shaped or capsule-shaped getters have to be introduced in separate steps. In the case of very thin insulating plates in particular, there is also the additional problem that the dimensions are very small and the integration of the getters into these thin insulating plates is difficult.
Aufgabe der vorliegenden Erfindung ist daher, eine Isolierplatte für den Niedertemperaturbereich bereitzustellen, die eine dauerhafte Beständigkeit gegen eindringenden Wasserdampf und/oder Gase aufweist.It is therefore an object of the present invention to provide an insulating plate for the low-temperature range which has permanent resistance to the ingress of water vapor and / or gases.
Diese Aufgabe wird gelöst durch eine Isolierplatte nach Anspruch 1. Vorteilhafte Ausbildungen sind Gegenstand der Unteransprüche.This object is achieved by an insulating plate according to claim 1. Advantageous developments are the subject of the dependent claims.
Der Vorteil einer derart ausgebildeten Isolierplatte liegt darin, daß das verwendete Trockenmittel in Pulverform vorliegt, welches mit den mikroporösen Füllmaterialien (feinteilige Metalloxide, ggf. mit Faserstoffen und Trübungsmitteln) vermischt, verpreßt und umhüllt wird. Dadurch wird kein zusätzlicher Herstellungsschritt benötigt, wie dies für das Einbringen der handelsüblichen Getter der Fall ist.The advantage of an insulating plate designed in this way is that the desiccant used is in powder form, which is mixed with the microporous filler materials (fine-particle metal oxides, optionally with fibrous materials and opacifiers), pressed and coated. This will not additional manufacturing step is required, as is the case for the introduction of commercially available getters.
Der Hauptvorteil eines Trockenmittels für die Verwendung in Isolierplatten ist dessen Langzeitwirkung. Das in den Isolierplatten enthaltene Trockenmittel wird so lange seine Wirkung entfalten, wie noch unverbrauchtes Material in dem Füllmaterial vorhanden ist. Erst danach würde die natürliche Wasserdampf-Aufnahmekapazität des Füllmaterials, z. B. Siliciumaerogele, beansprucht.The main advantage of a desiccant for use in insulating panels is its long-term effect. The desiccant contained in the insulating plates will have its effect as long as there is still unused material in the filling material. Only then would the natural water vapor absorption capacity of the filler, e.g. B. silicon aerogels claimed.
Vorteilhaft ist die Verwendung eines derartigen Trockenmittels auch für eine Lagerhaltung der noch nicht evakuierten Isolierplatten. Dadurch, daß eindringender Wasserdampf und/oder Gase abgefangen werden, sind die Isolierplatten auch nach längerer Lagerzeit noch genauso schnell und effizient evakuierbar wie unmittelbar nach der Herstellung.The use of such a desiccant is also advantageous for storing the insulating plates which have not yet been evacuated. The fact that penetrating water vapor and / or gases are trapped means that the insulating plates can be evacuated just as quickly and efficiently even after a long storage period as immediately after manufacture.
Ein weiterer wichtiger Aspekt der vorliegenden Erfindung ist, daß das Trockenmittel fein verteilt in den Isolierplatten vorliegt und nicht lokal konzentriert ist, wie dies bei einem Getter der Fall ist. Dadurch wird eine gleichmäßig über die ganze Isolierplatte erfolgende Aufnahme eindringenden Wasserdampfes erreicht.Another important aspect of the present invention is that the desiccant is finely divided in the insulating plates and is not locally concentrated as is the case with a getter. As a result, a penetration of water vapor which is uniformly carried out over the entire insulating plate is achieved.
Ferner kann als Umhüllung eine Kunststoffolie mit ihrer gegenüber Metallfolien ca. 1000fach höheren Wärmeleitfähigkeit verwendet werden. Trotz einer gegenüber Metallfolien höheren Wasserdampf- und Gasdurchlässigkeit droht nicht die Gefahr, daß das Vakuum im Laufe der Zeit abnimmt, da eindringende Gase und/oder Wasser abgefangen werden. So kann die geringere Wärmeleitfähigkeit gegenüber Metallfolien und damit die bessere Isolierfähigkeit der Kunststoffolie ausgenutzt werden, ohne befürchten zu müssen, daß die Isolierfähigkeit der Isolierplatte wegen eindringender Gase und/oder Wasserdampf im Laufe der Zeit abnimmt.Furthermore, a plastic film can be used with its thermal conductivity, which is about 1000 times higher than that of metal films. Despite a higher water vapor and gas permeability compared to metal foils, there is no danger that the vacuum will decrease over time, since penetrating gases and / or water are intercepted. Thus, the lower thermal conductivity compared to metal foils and thus the better insulating ability of the plastic film can be exploited without fear that the insulating ability of the insulating plate will decrease over time due to the penetration of gases and / or water vapor.
Als Trockenmittel für eine erfindungsgemäße Isolierplatte eignen sich alle insbesondere im Niedertemperaturbereich festen und pulverförmigen Trockenmittel, die mit Wasserdampf eine dauerhafte chemische Verbindung eingehen. Ebenfalls geeignet sind Trockenmittel, die nicht nur Wasserdampf, sondern auch Gase aufnehmen können.Suitable drying agents for an insulating plate according to the invention are all drying agents which are solid and powdery, in particular in the low-temperature range, and which form a permanent chemical connection with water vapor. Desiccants that can not only absorb water vapor but also gases are also suitable.
Als besonders bevorzugtes Trockenmittel wird Calciumoxid (CaO) verwendet. Calciumoxid (gebrannter Kalk oder Ätzkalk) bildet mit Wasser Calciumhydroxid (Ca(OH)2). Dieses ist ein inerter Feststoff, der aufgrund von Adsorptionsvorgängen mehr Wasser binden kann, als nach den stöchiometrischen Verhältnissen zu erwarten wäre. Calciumoxid ist leicht erhältlich, nicht teuer und bietet auch bei der Entsorgung der Isolierplatte keine Probleme, ebenso wie dies für Calciumhydroxid der Fall ist.Calcium oxide (CaO) is used as a particularly preferred drying agent. Calcium oxide (quicklime or quicklime) forms calcium hydroxide (Ca (OH) 2 ) with water. This is an inert solid, which due to adsorption processes can bind more water than would be expected according to the stoichiometric conditions. Calcium oxide is readily available, not expensive and does not pose any problems when disposing of the insulating plate, just like calcium hydroxide.
Weitere in der erfindungsgemäßen Isolierplatte verwendbare Trockenmittel sind z. B. Phosphorpentoxid (P2O5), Calciumhydrid (CaH), Aluminiumoxid (Al2O3) oder Kaliumcarbonat (K2CO3).Other desiccants that can be used in the insulating plate according to the invention are e.g. B. phosphorus pentoxide (P 2 O 5 ), calcium hydride (CaH), aluminum oxide (Al 2 O 3 ) or potassium carbonate (K 2 CO 3 ).
Die Zusammensetzung der Isolierplatte kann in Abhängigkeit von der gewünschten Anwendung variieren. Der Trockenmittelanteil beträgt bevorzugt 2 - 5 Gew-%. Nachfolgend sei eine besonders bevorzugte Zusammensetzung beispielhaft beschrieben:
- 63 Gew.-% feinteiliges Metalloxid;
- 27 Gew.-% Trübungsmittel;
- 7 Gew.-% Fasermaterial;
- 3 Gew.-% Trockenmittel in Form von CaO-Pulver.
- 63% by weight of finely divided metal oxide;
- 27% by weight opacifier;
- 7% by weight fiber material;
- 3% by weight of desiccant in the form of CaO powder.
Vorzugsweise verwendete feinteilige Metalloxide sind pyrogen erzeugte Kieselsäuren, einschließlich Lichtbogenkieselsäuren, alkaliarme Fällungskieselsäuren, Siliciumoxidaerogele, analog hergestellte Aluminiumoxide sowie deren Mischungen. Besonders bevorzugt werden Siliciumoxidaerogele.Preferably used finely divided metal oxides are pyrogenic silicas, including arcing silicas, low alkali precipitated silicas, silicon oxide aerogels, similarly produced aluminum oxides and mixtures thereof. Silicon oxide aerogels are particularly preferred.
Beispiele für Trübungsmittel sind Titandioxid, Ilmenit, Zirkondioxid und Zirkonsilikat sowie deren Mischungen. Bevorzugt wird Titandioxid verwendet. Beispiele für Fasermaterialien sind keramische Fasern, Glaswolle und Steinwolle, wobei bevorzugt Glasfasern eingesetzt werden. Als besonders bevorzugtes Trockenmittel wird fein gemahlenes Calciumoxid (CaO) beigemischt, da dieser aus der Baustoffindustrie bekannte "gebrannte Kalk" sehr preiswert erhältlich ist.Examples of opacifiers are titanium dioxide, ilmenite, zirconium dioxide and zirconium silicate and mixtures thereof. Prefers titanium dioxide is used. Examples of fiber materials are ceramic fibers, glass wool and rock wool, glass fibers being preferred. As a particularly preferred drying agent, finely ground calcium oxide (CaO) is added, since this "burnt lime" known from the building materials industry is available very inexpensively.
Variationen in der Zusammensetzung sind in folgenden Bereichen gewünscht und möglich:
- 30 - 80 Gew.-% feinteiliges Metalloxid;
- 0 - 50 Gew.-% Trübungsmittel;
- 0 - 50 Gew.-% Fasermaterial;
- 0,1-15 Gew.-% Trockenmittel.
- 30-80% by weight of finely divided metal oxide;
- 0 - 50% by weight opacifier;
- 0 - 50% by weight fiber material;
- 0.1-15 wt% desiccant.
Ebenso ist es möglich, einen Teil des Fasermaterials oder des Trübungsmittels durch ein Bindemittel oder einen Härter zu ersetzen.It is also possible to replace part of the fiber material or opacifier with a binder or a hardener.
Claims (10)
- An insulating plate, especially for the low temperature range, with a main component consisting of 30-80 wt% fine-particled metallic oxide,
characterized in that
said plate contains a desiccant based on calcium oxide. - The insulating plate of claim 1, characterized in that it contains 0-50 wt% of an opacifier, 0-50 wt% of fibrous material and 0.1-15 wt% of desiccant.
- The insulating plate of claim 1 or 2, characterized in that the desiccant proportion is 2-5 %.
- An insulating plate according to any of the preceding claims, characterized in that the desiccant is powdery.
- An insulating plate according to any of the preceding claims, characterized in that the desiccant is ilmenite, zirconium dioxide and zirconium silicate or a mixture of two or all of the components.
- The insulating plate of claim 1 or 2, characterized in that the fine-particled metallic oxide is a silica aerogel.
- The insulating plate of claim 1 or 2, characterized in that the opacifier is titanium dioxide.
- The insulating plate of claim 1 or 2, characterized in that the fibrous material is glass fibres.
- An insulating plate according to any of the preceding claims, characterized in that it is enveloped with a plastic foil.
- An insulating plate according to any of the preceding claims, characterized in that a binder or a hardener is contained in the packing.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19928011 | 1999-06-19 | ||
| DE19928011A DE19928011A1 (en) | 1999-06-19 | 1999-06-19 | Insulating board, especially for the low temperature range, e.g. in refrigeration plant, refrigerators and refrigerated technical equipment, preferably based on metal oxide powder, contains desiccant |
| PCT/EP2000/005637 WO2000079194A1 (en) | 1999-06-19 | 2000-06-19 | Insulating plate, especially for the low temperature range |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1192398A1 EP1192398A1 (en) | 2002-04-03 |
| EP1192398B1 true EP1192398B1 (en) | 2004-03-31 |
Family
ID=7911769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00938801A Expired - Lifetime EP1192398B1 (en) | 1999-06-19 | 2000-06-19 | Insulating plate, especially for the low temperature range |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1192398B1 (en) |
| AT (1) | ATE263348T1 (en) |
| DE (2) | DE19928011A1 (en) |
| WO (1) | WO2000079194A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101836067B (en) * | 2007-10-22 | 2014-03-12 | Bsh博世和西门子家用器具有限公司 | Refrigerator |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10308581A1 (en) * | 2003-02-27 | 2004-09-16 | Wacker-Chemie Gmbh | Thermal insulation for underwater components for oil and gas production |
| DE102011121090A1 (en) * | 2011-12-14 | 2013-06-20 | Saint-Gobain Isover G+H Ag | Thermal insulation element made of mineral wool, especially stone or glass wool |
| CN111326297B (en) * | 2020-03-05 | 2021-07-20 | 捷而科电材（上海）有限公司 | Electric insulating plate and processing technology thereof |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3993811A (en) * | 1974-08-15 | 1976-11-23 | The Dow Chemical Company | Thermal insulating panel for use in an insulative container and method of making said panel |
| DE3418637A1 (en) * | 1984-05-18 | 1985-11-21 | Wacker-Chemie GmbH, 8000 München | THERMAL INSULATION BODY WITH COVER |
| DE4019870A1 (en) * | 1990-06-22 | 1992-01-09 | Degussa | VACUUM INSULATION PANEL WITH ASYMMETRIC CONSTRUCTION |
| US5500305A (en) * | 1990-09-24 | 1996-03-19 | Aladdin Industries, Inc. | Vacuum insulated panel and method of making a vacuum insulated panel |
| DE4106727C2 (en) * | 1991-03-02 | 1995-11-16 | Porotherm Daemmstoffe Gmbh | Process for the production of encased microporous molded thermal bodies |
| DE4310613A1 (en) * | 1993-03-31 | 1994-10-06 | Wacker Chemie Gmbh | Microporous thermal insulation molded body |
| US5466504A (en) * | 1994-05-02 | 1995-11-14 | Owens-Corning Fiberglas Technology, Inc. | Fibrous glass insulation assembly |
| EP0762043B1 (en) * | 1995-03-07 | 2003-08-27 | Matsushita Refrigeration Company | Vacuum heat-insulator and heat-insulating box using the insulator |
| DE19635971C2 (en) * | 1996-09-05 | 2003-08-21 | Porextherm Daemmstoffe Gmbh | Thermal insulation molded body and method for its production |
| DE19801324A1 (en) * | 1998-01-16 | 1999-07-22 | Basf Ag | Sorbents for vacuum isolation units |
| DE19859084C1 (en) * | 1998-12-19 | 2000-05-11 | Redco Nv | Microporous heat insulating body, e.g. an insulating panel, comprises a pressed finely divided metal oxide, opacifier, inorganic fibers and inorganic binder material containing xonotlite |
-
1999
- 1999-06-19 DE DE19928011A patent/DE19928011A1/en not_active Withdrawn
-
2000
- 2000-06-19 DE DE50005917T patent/DE50005917D1/en not_active Expired - Fee Related
- 2000-06-19 WO PCT/EP2000/005637 patent/WO2000079194A1/en active IP Right Grant
- 2000-06-19 AT AT00938801T patent/ATE263348T1/en not_active IP Right Cessation
- 2000-06-19 EP EP00938801A patent/EP1192398B1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101836067B (en) * | 2007-10-22 | 2014-03-12 | Bsh博世和西门子家用器具有限公司 | Refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50005917D1 (en) | 2004-05-06 |
| DE19928011A1 (en) | 2000-12-21 |
| EP1192398A1 (en) | 2002-04-03 |
| ATE263348T1 (en) | 2004-04-15 |
| WO2000079194A1 (en) | 2000-12-28 |
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