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Composite materials comprising a polymer matrix and granules embedded therein

a polymer matrix and granule technology, applied in the field of composite materials, can solve the problems of affecting the use of vips, affecting the insulating effect, and deteriorating the insulating effect more or less rapidly with age,

Inactive Publication Date: 2013-03-21
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about a new type of insulation made from a composite material that can be shaped and sized in almost any way. It can also be cut to any size without losing its insulation properties. This makes it much more versatile than traditional insulation materials. Compared to pure PU foam insulation, the composite material provides better insulation.

Problems solved by technology

These panels permit excellent thermal insulation (thermal conductivities−3 W*m−1*K−1, determined in accordance with DIN 52 612, at 10° C., are realisable), but the insulating effect suffers markedly if the gas-tight sheet is damaged.
Moreover, the gas-tight sheets generally have a finite barrier sealing quality, and so there is also a more or less rapid age-related deterioration in the insulating effect.
In the context of the thermal insulation of buildings, the use of VIPs is substantially more problematic, since VIPs cannot be cut to size and when the gas-tight outer skin is damaged they loose their effect, yet the insulating boards are required in different sizes and shapes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Production of Granules

[0055]80% by weight of AEROSIL200 (fumed silica from Evonik Industries AG, BET surface area 200 m2 / g), 15% by weight of AROSPERSE 15 (thermal carbon black from Orion Engineered Carbons) and 5% by weight of glass fibres (glass fibre slithers, approximately 12 mm fibre length) were intimately mixed. This mixture was transferred in 0.6 g portions into a cylindrical compression mold with a diameter of 2 cm and compressed by means of a hydraulic press to form tablets each with a height of 1 cm. The density of the tablets was approximately 200 kg / m3.

example 2

Encapsulation of Evacuated Granules

[0056]The tablets produced in Example 1 were enveloped with a metallized sheet (multi-layer laminate from TOYO with PET outer layer, aluminium barrier layer and PE internal layer) by being placed between two plies of this sheet, followed by the two plies being welded thermally to one another in an annular fashion around the tablets. Within the annular weld seam, a small gap remained open, to which an oil-sealed rotary slide vacuum pump was attached via a tube. With the aid of the vacuum pump, the tablet was evacuated for 10 minutes and then under vacuum the opening in the film was welded, thus closing off the tablet in a gas-tight fashion. The protruding margin of the film was cut off up to the weld seam.

example 3

Production of a Composite Material From Encapsulated Granules and Foamed Polyurethane Matrix

[0057]The polymer matrix used was a rigid polyurethane foam formulation in accordance with Table 1.

TABLE 1PUR formulationComponentWeight fractionDaltolac R 471*  100 partsN,N-Dimethylcyclohexylamine 1.5 partsWater 2.6 partsCyclopentane 13.1 partsTEGOSTAB ® B 8462** 1.5 partsDesmodur 44V20L***198.5 Parts*Polyether polyol from Huntsman**Foam stabilizer from Evonik Industries AG***Polymeric MDI from Bayer, 200 mPa * s, 31.5% by weight NCO, functionality 2.7

[0058]The polyurethane foaming operations were conducted in a manual mixing procedure. Polyol, amine catalyst, water, foam stabilizer and blowing agent were weighed out into a beaker and mixed with a plate stirrer (6 cm diameter) at 1000 rpm for 30 seconds. Re-weighing was used to determine the amount of blowing agent evaporated during the mixing operation, and this amount was added again. Then the MDI was added and the reaction mixture was st...

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Abstract

The present invention provides composite materials comprising a polymer matrix comprising one or more polymers and, embedded into the polymer matrix, granules which preferably after embedding have at least one cavity which is closed off relative to the ambient environment and in which there is an underpressure relative to the standard pressure of 1 bar (100 kPa), a method for producing such composite materials, and use as insulating material.

Description

FIELD OF THE INVENTION[0001]The present invention is directed to composite materials comprising a polymer matrix comprising one or more polymers and, embedded into the polymer matrix, granules or shapes which preferably after embedding have at least one cavity which is closed off relative to the ambient environment and in which there is an underpressure relative to the standard pressure of 1 bar (100 kPa). The present intention also relates to a method for producing such composite materials, and to use of such composite materials as an insulating material.BACKGROUND OF THE INVENTION[0002]In the field of thermal insulation, vacuum insulation panels (VIPs) manufactured by enveloping a porous core material—for example, compacted fumed silica (Aerosil), fibre mats or open-cell foams—with a gas-tight sheet material and then carrying out evacuation are known. These panels permit excellent thermal insulation (thermal conductivities<3.5* 10−3 W*m−1*K−1, determined in accordance with DIN ...

Claims

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Application Information

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IPC IPC(8): E04B1/78
CPCB29C44/12C08K7/22C08K7/26C08K9/10F16L59/065C08J2205/05E04B2001/742C08J2375/04Y02B80/12C08J9/0066E04B1/803Y02B80/10Y02A30/242C08J9/00C08K3/08C08K3/36C08L75/04
Inventor EILBRACHT, CHRISTIANSCHILLER, CARSTENGLOS, MARTINMARKOWZ, GEORGSCHULTZ, THORSTEN
Owner EVONIK DEGUSSA GMBH
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