All posts tagged composites

Polyurethane-Epoxy IPN Composites

Patent Title: POLYMER COMPOSITE THERMAL INTERFACE MATERIAL WITH HIGH THERMAL CONDUCTIVITY

 Number/Link: WO2016/079627

Applicant/Assignee: IBM

Publication date: 26-05-2016

“Gist”: PU-Epoxy IPN particle composites show improved thermal conductivity

Why it is interesting: The application is about thermally conductive adhesives for use with electronic components. Commonly these materials consist of polymers filled with thermally- (but not electrically-) conductive particles such as AlN, BN and ZnO. According to the invention the thermal conductivity of these composites can be improved by using a polyurethane-epoxy true interpenetrating polymer network (IPN) as the matrix. In the examples a MDI-polycaprolactone prepolymer is mixed with a BPA diglycidylether prepolymer and boron nitride (BN) particles and crosslinked using trimethylolpropane and imidazole.  The thermal conductivity of the composite shows a synergy, meaning that it is clearly higher than the conductivities of both the PU or EP composites. The synergy is said to be due to an enhanced distribution of the BN particles and (because this is IBM and they are very clever) due to enhanced phonon scattering.

Bisphenol-A diglycidylether

Bisphenol-A diglycidylether

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by Gerhard Bleys on May 30, 2016  •  Permalink
Posted in Adhesives-Coatings
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on May 30, 2016

https://purpatents.com/2016/05/30/polyurethane-epoxy-ipn-composites/

Carbon-Black Reinforced Polyurethane Tires

Patent Title: TIRE WITH CARBON BLACK REINFORCED POLYURETHANE 

 Number/Link: US20160060420

Applicant/Assignee: Goodyear

Publication date: 3-03-2016

“Gist”: Dried, pulverized C-black is used in cast elastomer

Why it is interesting: According to this invention cast polyurethanes with properties useful for tire production can be made by incorporating 2-4% (w/w) of carbon black, pulverized to an average particle size of 5-10 μm. The carbon black is dispersed in the polyol component together with molecular sieves to absorb the water inherently present in carbon black.  It is said that removing the water allows the carbon black to react with an excess of isocyanate present, thereby greatly improving its reinforcing characteristics. Although not mentioned in the text I assume that the tires are intended for low-speed vehicles only.

GoodYear Tire

GoodYear Tire

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by Gerhard Bleys on March 4, 2016  •  Permalink
Posted in composites, dispersions, Elastomers
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on March 4, 2016

https://purpatents.com/2016/03/04/carbon-black-reinforced-polyurethane-tires/

Insulating Wood-Aerogel Composites

Title: REINFORCED ORGANIC NATURAL FIBER COMPOSITES

 Number/Link: WO2015/144267

Applicant/Assignee: Huntsman

Publication date: 1-10-2015

“Gist”: Aerogel particles are incorporated in composite wood boards

Why it is interesting: Composite wood products (OSB, MDF..) are  well known and popular construction materials which are produced by compressing wood fibers (or flakes and the like) together with a binder like e.g. a polymeric MDI. Typically these materials show thermal conductivity values of about 50 mW/m.K at densities of around 200 kg/m³.  According to this invention these insulation values can be significantly improved by incorporating (a large amount of) hydrophobic nanoporous particles and binding the composite with an in-water emulsified isocyanate. In the examples silica aerogel particles and wood fibers are mixed an bonded with an emulsifiable MDI. The amount of particles ranges from about 25 to 50% (w/w) resulting in composites with densities below 200 kg/m³ and insulation values of about 20 to 30 mW/mK.

Medium density fibreboard (MDF).

Medium density fibreboard (MDF).

3 Comments
by Gerhard Bleys on October 2, 2015  •  Permalink
Posted in Adhesives-Coatings, composites
Tagged , , , , , , , , , , , , ,

Posted by Gerhard Bleys on October 2, 2015

https://purpatents.com/2015/10/02/insulating-wood-aerogel-composites/

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