HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Page 1/2  >  >>
Beth Stackpole
User Rank
Blogger
Removing the burdens around sustainable design
Beth Stackpole   7/30/2012 8:06:25 AM
NO RATINGS
Love to see these efforts around creating renewable versions of proven materials and carrying over many of the same characteristics so they have high utility for materials engineers. Makes it very easy to go the sustainability route when the choices are just part of good, everyday design practices.

Dave Palmer
User Rank
Platinum
Soy-based polyurethanes
Dave Palmer   7/30/2012 12:15:31 PM
NO RATINGS
@Ann: Are you sure that the density is 1.45 g/cm³? This is equivalent to 90 pounds per cubic foot.  At this density, the  foam would sink in water.  The density of a typical polyurethane sound-absorbing foam is around 2 pounds per cubic foot (about 0.03 g/cm³).  Are you sure the density wasn't given in U.S. units, rather than metric units?

Generally, the sound absorption of foams depends on the frequency of the sound.  Any indication of what frequency range this foam is best suited for?

Also, any word on whether Dow has any plans to market this material in sheet form? Or will it be sold only as an injectable cavity foam?

Finally, how does the cost of the soy-based polyurethane compare to petroleum-based polyurethanes? This will definitely be a big factor in its acceptance.

Thanks for an article on an interesting topic.

Ann R. Thryft
User Rank
Blogger
Re: Removing the burdens around sustainable design
Ann R. Thryft   7/30/2012 12:35:51 PM
NO RATINGS
I also think it's cool that this cavity foam using a non-food renewable material that's a byproduct of food production. Many materials companies are getting on the bandwagon to ensure that their feedstocks are really green: both renewable and non-competitive with the human food supply.

Dave Palmer
User Rank
Platinum
Re: Removing the burdens around sustainable design
Dave Palmer   7/30/2012 1:06:37 PM
NO RATINGS
@Ann: Calling soybean oil a "byproduct of food production" rather than a food product is a little disingenuous.  Soybean oil is one of the most widely-consumed cooking oils.

It's true that the soy flakes, which remain after the oil is extracted, are used as animal feed (and for soy protein for human consumption).  Using the oil as an industrial feedstock wouldn't affect this use.

Of course, soybean oil is already widely used in industry -- for instance, it's used to make ink -- and it seems unlikely that the (relatively) small amount of additional soybean oil which would be used to make these foams would have any impact on the price or supply of cooking oil.

But, yes, soybean oil is a food product.

Ann R. Thryft
User Rank
Blogger
Re: Removing the burdens around sustainable design
Ann R. Thryft   7/30/2012 1:08:22 PM
NO RATINGS
Dave, the spec Dow provided was 1.45 gm/cc. Note that that's 25 percent less dense than the previous product at 2.0 gm/cc. James did not provide price details, or mention sheet forms of this product or any other future plans regarding it.

Dave Palmer
User Rank
Platinum
Re: Removing the burdens around sustainable design
Dave Palmer   7/30/2012 1:36:41 PM
NO RATINGS
@Ann: I wonder if your contact at Dow misspoke.  According to the datasheet for the previous product, its density is 2 pcf, not 2 g/cm³.

If so, it wouldn't be the first time somebody mixed up metric and U.S. customary units.

Ann R. Thryft
User Rank
Blogger
Re: Removing the burdens around sustainable design
Ann R. Thryft   7/30/2012 1:50:04 PM
NO RATINGS
Dave, at least one of the specs were on their presentations and they were also given in the interview. I find it tough to believe that anyone at Dow would mistake units of measurement. I've sent an email asking them to verify the spec.

greg
User Rank
Iron
Re: Removing the burdens around sustainable design
greg   7/30/2012 10:46:13 PM
NO RATINGS
at that density, and considering that as a foam it consists of mainly air, the material of the foam itself would have to be denser than lead!
must be a typo.


edit- from the dow chemicals betafoam brochure (not the new one):

BETAFOAM classic and low-MDI acoustic
foam products range in density from 2 pcf to
5 pcf.

Dave
User Rank
Gold
conversion
Dave   7/31/2012 12:15:36 PM
NO RATINGS
2 pcf = .03 grams per cc

Ann R. Thryft
User Rank
Blogger
Re: Removing the burdens around sustainable design
Ann R. Thryft   7/31/2012 12:36:50 PM
NO RATINGS
We've just heard back from Allan James, the person I interviewed at Dow. The spec he gave me was, in fact, wrong--thanks to Dave Palmer for pointing that out. James says the correct measurements are 1.45 pcf for BETAFOAM Renue and 2.0 pcf for the product being replaced.

Page 1/2  >  >>


Partner Zone
Latest Analysis
Former DARPA official and Google executive Dr. Kaigham Gabriel believes sensor companies think too much like suppliers and need to bring their products closer to the consumer.
One way to keep a Formula One racing team moving at breakneck speed in the pit and at the test facility is to bring CAD drawings of the racing vehicleís parts down to the test facility and even out to the track.
Most of us would just as soon step on a cockroach rather than study it, but thatís just what researchers at UC Berkeley did in the pursuit of building small, nimble robots suitable for disaster-recovery and search-and-rescue missions.
Engineers at Festo were inspired by how a caterpillar builds its cocoon when designing its new 3D Cocooner printer.
Design engineers need to prepare for a future in which their electronic products will use not just one or two, but possibly many user interfaces that involve touch, vision, gestures, and even eye movements.
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Course June 28-30:
Sponsored by Proto Labs
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service