EP1192398B1 - Plaque isolante, notamment adaptee au domaine des basses temperatures - Google Patents

Plaque isolante, notamment adaptee au domaine des basses temperatures Download PDF

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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
Authority
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
Application number
EP00938801A
Other languages
German (de)
English (en)
Other versions
EP1192398A1 (fr
Inventor
Hannes Porextherm-Dämmstoffe GmbH REISACHER
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.)
Porextherm-Dammstoffe GmbH
Porextherm Daemmstoffe GmbH
Original Assignee
Porextherm-Dammstoffe GmbH
Porextherm Daemmstoffe GmbH
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 Porextherm-Dammstoffe GmbH, Porextherm Daemmstoffe GmbH filed Critical Porextherm-Dammstoffe GmbH
Publication of EP1192398A1 publication Critical patent/EP1192398A1/fr
Application granted granted Critical
Publication of EP1192398B1 publication Critical patent/EP1192398B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Drying Of Gases (AREA)
  • Insulating Bodies (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)

Claims (10)

  1. Plaque isolante, en particulier pour les basses, comportant un composant principal de 30 à 80 % en masse d'oxyde métallique fin, caractérisée en ce que celle-ci comporte un agent asséchant à base d'oxyde de calcium.
  2. Plaque isolante selon la revendication 1, caractérisée en ce que celle-ci comprend 0 à 50 % en masse d'un agent opacifiant, 0 à 50 % en masse de matériau fibreux et 0,1 à 15 % en masse d'agent asséchant.
  3. Plaque isolante selon la revendication 1 ou 2, caractérisée en ce que la proportion en agent asséchant représente 2 à 5 %.
  4. Plaque isolante selon l'une des revendications précédentes, caractérisée en ce que l'agent asséchant se présente sous la forme d'une poudre.
  5. Plaque isolante selon l'une des revendications précédentes, caractérisée en ce que l'agent asséchant est de l'ilménite, du dioxyde de zirconium et du silicate de zirconium, ou est un mélange de deux de ces composants ou de tous ces composants.
  6. Plaque isolante selon la revendication 1 ou 2, caractérisée en ce que l'oxyde métallique, finement divisé est un aérogel d'oxyde de silicium.
  7. Plaque isolante selon la revendication 1 ou 2, caractérisée en ce que l'agent opacifiant est du dioxyde de titane.
  8. Plaque isolante selon la revendication 1 ou 2, caractérisée en ce que le matériau fibreux est constitué par des fibres de verre.
  9. Plaque isolante selon l'une des revendications précédentes, caractérisée en ce que celle-ci est enveloppée d'une feuille de matière plastique.
  10. Plaque isolante selon l'une des revendications précédentes, caractérisée en ce qu'un liant ou un durcisseur est contenu dans le matériau de charge.
EP00938801A 1999-06-19 2000-06-19 Plaque isolante, notamment adaptee au domaine des basses temperatures Expired - Lifetime EP1192398B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19928011 1999-06-19
DE19928011A DE19928011A1 (de) 1999-06-19 1999-06-19 Isolierplatte, insbesondere für den Niedertemperaturbereich
PCT/EP2000/005637 WO2000079194A1 (fr) 1999-06-19 2000-06-19 Plaque isolante, notamment adaptee au domaine des basses temperatures

Publications (2)

Publication Number Publication Date
EP1192398A1 EP1192398A1 (fr) 2002-04-03
EP1192398B1 true EP1192398B1 (fr) 2004-03-31

Family

ID=7911769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00938801A Expired - Lifetime EP1192398B1 (fr) 1999-06-19 2000-06-19 Plaque isolante, notamment adaptee au domaine des basses temperatures

Country Status (4)

Country Link
EP (1) EP1192398B1 (fr)
AT (1) ATE263348T1 (fr)
DE (2) DE19928011A1 (fr)
WO (1) WO2000079194A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101836067B (zh) * 2007-10-22 2014-03-12 Bsh博世和西门子家用器具有限公司 冰箱

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10308581A1 (de) * 2003-02-27 2004-09-16 Wacker-Chemie Gmbh Wärmedämmung für Unterwasser-Bauteile für die Öl- und Gasförderung
DE102011121090A1 (de) * 2011-12-14 2013-06-20 Saint-Gobain Isover G+H Ag Wärmedämmelement aus Mineralwolle, insbesondere Stein-oder Glaswolle
CN111326297B (zh) * 2020-03-05 2021-07-20 捷而科电材（上海）有限公司 一种电气绝缘板及其加工工艺

Family Cites Families (11)

* Cited by examiner, † Cited by third party
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 (de) * 1984-05-18 1985-11-21 Wacker-Chemie GmbH, 8000 München Waermedaemmformkoerper mit umhuellung
DE4019870A1 (de) * 1990-06-22 1992-01-09 Degussa Vakuumisolationspanel mit asymmetrischem aufbau
US5500305A (en) * 1990-09-24 1996-03-19 Aladdin Industries, Inc. Vacuum insulated panel and method of making a vacuum insulated panel
DE4106727C2 (de) * 1991-03-02 1995-11-16 Porotherm Daemmstoffe Gmbh Verfahren zur Herstellung von umhüllten mikroporösen Wärmedämmformkörpern
DE4310613A1 (de) * 1993-03-31 1994-10-06 Wacker Chemie Gmbh Mikroporöser Wärmedämmformkörper
US5466504A (en) * 1994-05-02 1995-11-14 Owens-Corning Fiberglas Technology, Inc. Fibrous glass insulation assembly
DE69629636T2 (de) * 1995-03-07 2004-06-17 Matsushita Refrigeration Co., Kusatsu Vakuumwärmeisolierung und wärmeisolierender behälter unter verwendung dieser isolierung
DE19635971C2 (de) * 1996-09-05 2003-08-21 Porextherm Daemmstoffe Gmbh Wärmedämmformkörper und Verfahren zu dessen Herstellung
DE19801324A1 (de) * 1998-01-16 1999-07-22 Basf Ag Sorptionsmittel für Vakuumisolationseinheiten
DE19859084C1 (de) * 1998-12-19 2000-05-11 Redco Nv Mikroporöser Wärmedämmkörper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101836067B (zh) * 2007-10-22 2014-03-12 Bsh博世和西门子家用器具有限公司 冰箱

Also Published As

Publication number Publication date
WO2000079194A1 (fr) 2000-12-28
DE19928011A1 (de) 2000-12-21
ATE263348T1 (de) 2004-04-15
EP1192398A1 (fr) 2002-04-03
DE50005917D1 (de) 2004-05-06

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