All posts tagged heat insulation

Reactive Cellopener for Polyurethane Rigid Foams

Title: REACTIVE CELL OPENER COMPOSITION, POLYOL COMPOSITION, AND OPEN-CELLED POLYURETHANE FOAM

 Number/Link: US2014/0231708

Applicant/Assignee: LG Electronics

Publication date: 21-08-2014

“Gist”:  A silicon oil together with the lithium-salt of 12-hydroxystearic acid is used as cellopener for rigid VIP foams.

Why it is interesting: While coventional rigid insulation foams are closed-celled, rigid foams for use in vacuum insulation panels (VIPs) need to have a very high open cell content together with a cell size which is as small as possible. The current invention relates to reactive cellopeners comprising a silicone ‘base’ oil and the metal salt of a fatty acid having a (isocyanate-reactive) hydroxy group.  In an example the Li-salt of of 12-hydroxystearic acid is produced from LiOH and the fatty acid using a silicone oil as reaction medium. The composition, having a 30% solids content, is then used as a cellopener in a rigid foam formulation resulting in a cell size of about 90μm and 98% open cell content at a density of about 50 kg/m³. A perfluoroalkane nucleating agent was used as well.

12-hydroxystearic acid

12-hydroxystearic acid

 

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by Gerhard Bleys on August 25, 2014  •  Permalink
Posted in dispersions, Rigid Foams
Tagged , , , , , , ,

Posted by Gerhard Bleys on August 25, 2014

https://purpatents.com/2014/08/25/reactive-cellopener-for-polyurethane-rigid-foams/

Improved “Black” Insulation Foams

Title: ISOCYANATE-BASED POLYMER FOAM COMPOSITE WITH IMPROVED THERMAL INSULATION PROPERTIES

 Number/Link: US20140151593

Applicant/Assignee: Dow

Publication date: 5-06-2014 (Priority PCT/US)

“Gist”: Use of fluorinated carbon black to improve insulation value of rigid polyurethane foams

Why it is interesting: It is known that carbon black can be used to improve the insulation value of rigid foams by reducing the radiation component of the thermal conductivity. The carbon black however needs to have a very small particle size and needs to be extremely well dispersed into the reacting medium. According to the invention using a fluorinated carbon black improves the dispersion into the raw materials which, in turn, improves the final insulation value of the foam.
A small but valuable innovation.

Different grades of carbon black

Different grades of carbon black

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by Gerhard Bleys on June 18, 2014  •  Permalink
Posted in dispersions, Rigid Foams
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on June 18, 2014

https://purpatents.com/2014/06/18/improved-black-insulation-foams/

Monolithic Polyurethane Aerogels

Title: POROUS POLYURETHANE NETWORKS AND METHODS OF PREPARATION

 Number/Link: US2014/147607

Applicant/Assignee: Aerogel Technologies

Publication date: 29-05-2014

“Gist”: Monomeric tri-isocyanate and aromatic di- and triols dissolved in acetone and catalyzed by DBTDL form a gel which is supercritically dried into an aerogel.

Why it is interesting: Isocyanate-based aerogels have been reported before but because these are usually based on ‘industrial’ oligomeric raw materials like polymeric MDI and oligomeric polyols they have low mechanical properties. In the current invention, PU aerogels are prepared from monomeric tri-isocyanates (e.g. tris(isocyanatophenyl)methane) which is reacted with an aromatic triol (e.g. tris(hydroxyphenyl)ethane) and an aromatic diol (e.g.  bisphenol-A) and catalyzed by DBTDL.  The reaction takes place in anhydrous acetone which after gelation gets replaced by supercritical CO2.  The resulting nanoporous materials are high in density (200-700 kg/m3) with a compressive modulus of more than 50MPa and a thermal conductivity below 50mW/m.K .

A (silica) aerogel.

A (silica) aerogel.

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by Gerhard Bleys on June 4, 2014  •  Permalink
Posted in Rigid Foams
Tagged , , , , , ,

Posted by Gerhard Bleys on June 4, 2014

https://purpatents.com/2014/06/04/monolithic-polyurethane-aerogels/

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