All posts in category composites

Aqueous Polyurethane Dispersion with Integrated Nanoparticles

Title: AQUEOUS DISPERSIONS OF POLYURETHANE AND NANOPARTICLES

 Number/Link: WO2013/059106

Applicant/Assignee: Bayer

Publication date: 25-04-2013

“Gist”: Amino-functional inorganic nanoparticles are reacted with residual isocyanate groups of a PUD-forming polyurethane prepolymer and subsequently dispersed in water.

Why it is interesting: A water-dispersible polyurethane prepolymer is made from isocyanate, polyol and chain extender in which polyol and/or chain extender comprise ionic or potentially ionic groups.  The prepolymer is produced with a surplus of isocyanate which is subsequently reacted with amino-functional inorganic nanoparticles.  The nanoparticles consist of e.g. metal oxides which were reacted with a “bridging compound” comprising an isocyanate-reactive group (NH2 or OH) and a particle-reactive group e.g. a halogen or silane group. The polyurethane with covalently integrated nanoparticles can then be dispersed in water using a known process.  The resulting PUD has a high shelf-life and can be used in coatings, adhesives, films etc. with improved properties.

Polyurethane dispersion and film made from it. (Wikimedia)

Polyurethane dispersion and film made from it. (Wikimedia)

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by Gerhard Bleys on April 30, 2013  •  Permalink
Posted in Adhesives-Coatings, composites, dispersions, Elastomers
Tagged , ,

Posted by Gerhard Bleys on April 30, 2013

https://purpatents.com/2013/04/30/aqueous-polyurethane-dispersion-with-integrated-nanoparticles/

Nanoporous Insulation

Title: INORGANIC NANOPOROUS PARTICLES WITH WATER DISPERSIBLE POLYURETHANE BINDER

 Number/Link: US2013091682

Applicant/Assignee: Dow

Publication date: 18-04-2013  (priority 2012- PCT/CN)

“Gist”:  Flexible nanoporous insulation article made by binding aerogel particles with water-based polyurethane binder.

Why it is interesting: Nanoporous  materials are a big trend in insulation technology. Because monolithic aerogel parts are difficult to make and difficult to use, much research focuses on the use of nanoporous (aerogel, xerogel…) particles instead. This invention uses uncoated silica aerogel particles together with an aqueous PU binder.  The particles are sufficiently hydrophobic to prevent water ingress in the pores. The PU binder is based on aliphatic isocyanate and contains dimethylolpropionic acid to make it water-dispersible. The resulting material contains about 95% aerogel particles and has a density of about 100 kg/m3.

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by Gerhard Bleys on April 23, 2013  •  Permalink
Posted in Adhesives-Coatings, composites
Tagged , ,

Posted by Gerhard Bleys on April 23, 2013

https://purpatents.com/2013/04/23/nanoporous-insulation/

Rigid Polyurethane Foam With Very High Amount of Fillers

Title: MEDIUM DENSITY FOAMS HAVING GOOD IMPACT RESISTANCE AND A PROCESS FOR THEIR PRODUCTION

 Number/Link: US2013072588

Applicant/Assignee: Bayer

Publication date: 21-03-2013

“Gist”: Up to 80% of a mixture of glass fibers and other fillers is incorporated into rigid foam to improve impact resistance.

Why it is interesting: Use of fillers in PU foams is well known but the amounts are usually limited to about 20% w/w. In this case 10-30% of glass fibers with a fiber length of about 25mm is used together with 30-60% of particulate fillers.  In the examples ammonium polyphosphate is used together with calcium carbonate and glass fibers.  Foam density ranges from 150 to about 350 kg/m3.  Bayer claims an improved impact resistance.  Other mechanical properties are not given.

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by Gerhard Bleys on March 27, 2013  •  Permalink
Posted in composites, Rigid Foams
Tagged

Posted by Gerhard Bleys on March 27, 2013

https://purpatents.com/2013/03/27/rigid-polyurethane-foam-with-very-high-amount-of-fillers/

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