All posts in category Elastomers

Insulating Elastomer-Aerogel Composites

Title: INSULATING MATERIAL COMPRISING AN ELASTOMER IMPREGNATED WITH AEROGEL-BASE

 Number/Link:  US2013022769

Applicant/Assignee: UNIV MEMPHIS

Publication date: 24-01-2013

“Gist”: Elastomeric material containing aerogel ‘bodies’, useful for heat insulation.

Why it is interesting:  The elastomeric matrix material can be any kind of thermoset or thermoplastic rubber, including polyurethanes but RTV silicones are preferred. The aerogels can be organic, inorganic or hybrid, but are preferably polyurea-crosslinked silicas of any geometrical shape,  preferably 1-5mm in size with an aerogel:polymer ratio of 15:100 to 200:100 (w/w). Both insulation and mechanical properties compare favourably to ASPEN aerogel blankets. Useful for insulation of cryogenic fuel tanks a.o.

Space shuttle with PU insulated cryogenic fuel tank.

Space shuttle with PU insulated cryogenic fuel tank. (Wikimedia)

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by Gerhard Bleys on February 1, 2013  •  Permalink
Posted in composites, Elastomers
Tagged , , ,

Posted by Gerhard Bleys on February 1, 2013

https://purpatents.com/2013/02/01/insulating-elastomer-aerogel-composites/

Polyurethane Integral Skin Foam with Improved Acoustic Properties

Title:  INCREASING THE SOUND ABSORPTION IN FOAM INSULATING MATERIALS

 Number/Link: WO2013/007243  (German)

Applicant/Assignee: OTTO BOCK SCHAUMSYSTEME GMBH

Publication date: 17-01-2013

“Gist”: Use of  expandable graphite to improve sound absorption and sound insulation properties of  integral skin foams.

Why it is interesting: Expandable graphite is well known as an intumescent flame retardant in coatings and in e.g. low-density (semi-) rigid PU foams, including acoustic foams. This case claims the use of 5-40% (w/w on polyol) of non pre-expanded expandable graphite in a (preferably) 200-300 kg/m3 integral skin foam, resulting in improved sound absorption coefficients and sound insulation (transmission loss?).  It is contemplated that it is the layered structure of the graphite that absorbs the acoustic energy…

 

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by Gerhard Bleys on January 22, 2013  •  Permalink
Posted in Elastomers
Tagged , ,

Posted by Gerhard Bleys on January 22, 2013

https://purpatents.com/2013/01/22/polyurethane-integral-skin-foam-with-improved-acoustic-properties/

Vulcanized Rubber Containing Isocyanate-Modified Filler

Title: FILLED ELASTOMER COMPRISING POLYURETHANE

 Number/Link: WO2013004714

Applicant/Assignee: BASF  (Chinese priority)

Publication date: 10-01-2013

“Gist”: “Raw” rubber is vulcanized in the presence of  precipitated silica (preferred) which has been modified with an isocyanate prepolymer (pref) containing a hydrophobic and/or rubber-reactive moiety.

Why it is interesting: The rubber can be NR, BR, SBR, IIR, EPDM, etc which is vulcanized in the conventional manner in the presence of a filler, preferably a fumed or precipitated silica.  The filler has been mixed with an isocyanate-ended prepolymer prepared from a 2000 MW polyol and a di-isocyanate.  The polyol preferably contains a hydrophobic group (e.g. from a fatty acid) or a double bond (from a unsaturated diacid).  As a result the filler will be dispersed more finely and will have a strong rubber interachtion potentially greatly improving the rubber properties.  Useful for footwear e.g.

Vulcanized Rubber Boots (Wikipedia)

Vulcanized Rubber Boots (Wikipedia)

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by Gerhard Bleys on January 18, 2013  •  Permalink
Posted in composites, Elastomers, Isocyanates and Prepolymers
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Posted by Gerhard Bleys on January 18, 2013

https://purpatents.com/2013/01/18/vulcanized-rubber-containing-isocyanate-modified-filler/

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