DE102009000093A1 - Damping composite structure for isolating of e.g. building part, has infrared-reflective layer arranged between two foam plastic plates, and air gap present between infrared-reflective layer and foam plastic plates - Google Patents

Abstract

The structure has an infrared-reflective layer arranged between two foam plastic plates. An air gap is present between the infrared-reflective layer and the foam plastic plates. The infrared-reflective layer includes an aluminum foil with a thickness of 1 to 30 micro meters, and the foam plastic plates include a thickness in the range of 5 to 100 milli meters. The foam plastic plates include extrusion foam plastic or particle foam plastic on the basis of styrol polymers or polyolefins. The air gap includes a thickness in the range of 1 to 10 milli meters.

Description

The The invention relates to an insulation composite structure of at least two foam plates and an infrared reflecting layer, the infrared reflecting layer between the foam plates is arranged.

In order to reduce the thermal conductivity of polystyrene foams, they have been treated in various ways with athermanous materials such as carbon black (US Pat. EP-A 372 343 . EP-A 620 246 ), Graphite ( EP-A 981 574 and EP-A 981 575 ) or aluminum flakes ( WO 00/043442 ) was added. Here, depending on the type and incorporation high amounts of athermanous materials are needed, which can lead to problems in the homogeneous incorporation due to the nucleating effect. Furthermore, the mechanical properties of the foams produced therefrom and its fire behavior can be negatively influenced.

Extruded polystyrene (XPS) foams are used extensively to insulate buildings and parts of buildings. For this purpose, the foam plates must have the lowest possible thermal conductivity. Recently, for environmental reasons, to produce XPS plates halogen-free propellants, preferably CO ₂ -containing propellant mixtures used. However, CO ₂ diffuses out of the foam cells much faster than fluorine-containing gases and is replaced by air. For this reason, the thermal conductivity of XPS panels made with CO ₂ -containing propellants is slightly higher than that of XPS panels made with fluorocarbons.

Out EP-A 863 175 . EP-A 1 031 600 . WO 02/081555 and WO 01/04191 It is known that the thermal conductivity can be reduced by adding graphite particles during XPS production.

The WO 98/10216 describes a highly reflective insulating mat of an aluminum film coated polyester layer and an intermediate insulating layer of a plastic film with trapped air bubbles.

The EP 1 321 594 B1 and EP 1 626 133 B1 describe multilayer insulating materials with two aluminum foils on the outsides of a three-layer insulating layer. For the insulating layers, an air bubble film and a plastic foam are used.

task It was the object of the present invention to provide an insulation composite structure to find with reduced thermal conductivity, easy to manufacture and for any foam plates can be used.

Accordingly, became found the Dämmverbundstruktur described above.

Prefers is located between the infrared reflective layer and at least one foam plate an air gap, which is preferred has a thickness in the range of 1 to 10 mm. The air gap is used in essential for decoupling the.

Of the Air gap can be realized, for example, that the Infrared reflecting layer and the at least one foam plate over Webs or O-rings are separated as spacers. Another Possibility is using a foam board with a structured, for example, waffled surface use. Preferably, the layer with the air gap from 80 to 90 vol .-% air and 10 to 20 vol .-% spacers.

When Foam boards can be particle foams or extrusion foams be used from thermoplastic polymers. particle foams are by sintering foam particles, for example, from expanded Polyolefins, such as expandable polypropylene (EPP) or prefoamed particles made of expandable polystyrene (EPS). Prefers Foam boards are used which have a closed foam skin have, for. B. an extrusion foam based on a styrene polymer (XPS).

The foam boards generally have a density in the range of 10 to 100 kg / m ³ . They are usually closed cell, ie they preferably have cells which are at least 90%, in particular 95 to 100% closed-cell. To improve the adhesion to mortar, concrete and plaster systems and to form an air gap when placing the infrared-reflective layer they can after production z. B. embossed with a waffle pattern and punched.

The foam sheets generally have a thickness in the range of 5 to 100 mm, preferably 10 to 50 mm, particularly preferably 15 to 30 mm. In particular, for thermal insulation in construction applications cuboid foam boards are used with a cross section of at least 50 cm ² .

Foam boards with a thermal conductivity of 0.035 W / mK (measured after DIN 52612 at 10 ° C) or below. These may be 0.01 to 10 wt .-%, based on the polymer, of a particulate IR absorber, such as carbon black, metal powder, for. As aluminum powder and titanium dioxide, preferably contain graphite having an average particle size of 1 to 100 microns.

Uniform, closed-cell and dimensionally stable extruded polystyrene foam bodies (XPS) made from a polystyrene thermoplastic matrix having an average molecular weight M _w between 175,000 and 500,000 g / mol and a nonuniformity M _w / M _n greater than are produced using halogen-free blowing agents are particularly preferred than 1.5, as in the EP-A-0 802 220 are used. They usually have a compressive strength measured after DIN EN 826 in the range of 0.2 to 1.0 N / mm ² , preferably in the range of 0.3 to 0.7 N / mm ² . Preferably, the density is in the range of 25 to 50 g / l and the thickness in the range of 20 to 200 mm. The cross section is usually at least 50 cm ² , preferably 100 to 2000 cm ² .

to Elimination of the radiation component is inventively a Infrared reflective layer disposed between the foam sheets. As an infrared reflecting layer, an aluminum foil or a Plastic film, which infrared-reflecting pigments, such as titanium dioxide, Aluminum, carbon black or graphite particles used become. The thickness of the infrared-reflective layer is preferred in the range of 1 to 30 microns, more preferably in the range from 4 to 10 μm. Particularly preferred is a 1 to 30 microns thick Aluminum foil used.

The Dämmverbundstruktur invention, regardless of the plate thickness, a thermal conductivity (λ value) at 10 ° C after DIN EN 13164 and DIN EN 12667 of 0.030 W / mK or less.

Examples

The following materials were used for the examples:
Extruded polystyrene foam sheets (XPS), styrodur ^® at a density of 40 kg / m ³ and with a size of 1250 mm x 600 mm x 50 mm.

Polystyrene particle foam boards (600 × 1000 × 100 mm) made of prefoamed, expandable polystyrene (EPS) with a foam density of 10 to 25 kg / m ³ .

Aluminum foil 20 μm

For the examples Dämmverbundstrukturen were assembled with a structure according to Table 1. For comparison, two foam plates without aluminum foil and air gap were measured. The in accordance with DIN 52612 (Poensgen method) after 24 h storage at 23 ° C determined thermal conductivities (WLF) are also summarized in Table 1. Table 1: example foam layers construction WLF [mW / mK] V1 XPS 40 kg / m ³ 20 mm XPS 20 mm XPS 32.0 V2 XPS 40 kg / m ³ 20 mm XPS 3 mm air gap 20 mm XPS 31.9 B1 XPS 40 kg / m ³ 20 mm XPS 20 μm aluminum foil 20 mm XPS 29.3 B2 XPS 40 kg / m ³ 20 mm XPS 3 mm air gap 20 μm aluminum foil 20 mm XPS 27.0 V3 EPS 10 kg / m ³ 20 mm EPS 20 mm EPS 43.3 V3 EPS 15 kg / m ³ 20 mm EPS 20 mm EPS 39.0 V5 EPS 25 kg / m ³ 20 mm EPS 20 mm EPS 28.3 B3 EPS 10 kg / m ³ 20 mm EPS 20 μm aluminum foil 20 mm EPS 38.4 B4 EPS 15 kg / m ³ 20 mm EPS 20 μm aluminum foil 20 mm EPS 31.4 B5 EPS 25 kg / m ³ 20 mm EPS 20 μm aluminum foil 20 mm EPS 27.4

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 372343 A [0002]
• - EP 620246 A [0002]
• - EP 981574 A [0002]
• - EP 981575 A [0002]
• WO 00/043442 [0002]
• - EP 863175 A [0004]
• - EP 1031600 A [0004]
• WO 02/081555 [0004]
• WO 01/04191 [0004]
• WO 98/10216 [0005]
• - EP 1321594 B1 [0006]
• - EP 1626133 B1 [0006]
• EP 0802220 A [0015]

Cited non-patent literature

• - DIN 52612 [0014]
• - DIN EN 826 [0015]
• - DIN EN 13164 [0017]
• - DIN EN 12667 [0017]
• - DIN 52612 [0020]

Claims (8)

Dämmverbundstruktur of at least two foam plates and an infrared-reflective layer, characterized in that the infrared-reflecting layer is disposed between the foam plates. Dämmverbundstruktur according to claim 1, characterized characterized in that between the infrared-reflective Layer and at least one foam plate is an air gap. Insulating composite structure according to claim 1 or 2, characterized in that the foam sheets of a Extruded foam based on styrene polymers or polyolefins consist. Insulating composite structure according to claim 1 or 2, characterized in that the foam sheets of a Particle foam based on styrene polymers or polyolefins consist. Insulating composite structure according to one of the claims 1 to 4, characterized in that the infrared reflecting Layer consists of a 1 to 30 microns thick aluminum foil. Insulating composite structure according to one of the claims 1 to 5, characterized in that the foam plates a Have thickness in the range of 5 to 100 mm. Insulating composite structure according to one of the claims 1 to 6, characterized in that the air gap has a thickness in the Range of 1 to 10 mm. Insulating composite structure according to one of claims 1 to 7, characterized in that the foam plates have a density in the range of 10 to 100 kg / m ³ .