HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
View Comments: Newest First|Oldest First|Threaded View
Page 1/2  >  >>
Rob Spiegel
User Rank
Blogger
Re: Legacy materials fight back
Rob Spiegel   6/18/2012 3:22:39 PM
NO RATINGS
The steel industry is trying to make the most of the difficulties in recycling composites. They keep saying, "Hey, you have to look at the green value from cradle to grave."

Dave Palmer
User Rank
Platinum
Re: How Strong?
Dave Palmer   6/11/2012 12:57:32 PM
NO RATINGS
@sjmonte: A joule is a unit of energy, not tensile strength.  Tensile strengths are customarily given in units of pascals; one joule per cubic meter is equal to one pascal.  However, since one pascal is very small, it's common to use the megapascal, i.e. million pascals, as the base unit.

Could you please give us the tensile strength in either megapascals or pounds per square inch?

In any case, the strength increases you report (more than 2x dry and more than 5x wet) are very impressive.  If you have been producing these coupling agents since the 1970s, why haven't they been more widely adopted? I'd expect the composites industry to be extremely enthusiastic about something like this.

sjmonte@4kenrich.com
User Rank
Iron
Re: How Strong?
sjmonte@4kenrich.com   6/8/2012 9:03:29 PM
NO RATINGS
Ann:  We have exhibited in the past few months at the following conferences and trade shows: ACMA 2012; SAMPE 2012; American Coatings Show 2012; ACS Rubber Division Energy Rubber Group Winter Conference; SPI NPE 2012; and SPE International Polyolefins 2012. So, it's just not fiberglass reinforced polyester.  I am talking about all manner of inorganic and organic reinforcements used in thermosets and thermoplastics  We manufacture since 1973 organometallic coupling agents based on titanium, zirconim, and aluminum chemistry - rather than silane chemistry.  I have 29-U.S. Patents and 1 pending on their composition of matter and their application, and 375-ACS CAS abstracted works on the subject of the interface and their application in polymer compositions. 

A class of neoalkoxy and coordinate titanates and zirconates can coordinate couple to any surface via its protons ever present on the inorganic/organic reinforcement - from carbon and aramid fiber to CaCO3 to PTFE - thus forming an impervious 1.5-nanometer chemical bridge between say the carbon fiber and epoxy.  The fiber does not have to be pretreated, but can be coupled in-situ becase water of condensation is not needed as with silanes, which react with surface hydroxyls to form a silanol oligomer, which in turn condenses with the surface hydroxyl group to condense 3-moles of water, which must be removed.

The titanate or zirconate uses the resin phase to bring it to the interface and deposit 1.5-nanometer atomic monolayers thus bonding the resin to the reinforcement surface that subsequently resists aged deterioration under high pressure, high temperature, and severe environmental conditions such as 240-hr. water boil in 10% salt water.  This mechanism works on all manner of carbonaceous substrates: carbon fiber; carbon black; carbon nano tubes; graphene; etc.

For example, carbon fiber reinforced methyl nadic anhydride cured epoxy composites produced by General Dynamics without zirconate will have a long-fiber tensile strength of 62 Joules, which will deteriorate to 21 Joules 240-hr. water boil in 10% salt water, while 4-parts per thousand of a zirconate [Ken-React(r) NZ(r) 97] added to the epoxy will yield 119 Joules Tensile initial and 113 Joules when similarly water boiled aged.

Sal Monte

http://www.4kenrich.com/Pagesetter/viewpub/tid/1/pid/1

 

Ann R. Thryft
User Rank
Blogger
Re: Legacy materials fight back
Ann R. Thryft   6/8/2012 2:12:45 PM
NO RATINGS
Rob, I agree about the recycling difference. Recycling composites is not an easy thing to do, and will not be a simple solution.

Rob Spiegel
User Rank
Blogger
Re: Legacy materials fight back
Rob Spiegel   6/7/2012 2:17:15 PM
NO RATINGS
You're right about the end of life of steel and aluminum. Steel's big argument in the face of new materials is the ease of recycling.

Ann R. Thryft
User Rank
Blogger
Re: Legacy materials fight back
Ann R. Thryft   6/7/2012 12:57:30 PM
NO RATINGS
Actually, fabrication difficulty is mentioned several times in the article, both directly and indirectly, as moldability, disruptive technology vs non-disruptive technology, as "3D components involve a more complicated, expensive molding technology" and "CFRPs are not only more expensive, but using them is also a step change difference, which is much greater than transitioning from using one metal to another metal." Regarding recyclability, it's interesting to note that Boeing has invested in composite recycling: http://www.designnews.com/document.asp?doc_id=235280

Ann R. Thryft
User Rank
Blogger
Re: How Strong?
Ann R. Thryft   6/7/2012 12:51:12 PM
NO RATINGS
I'm not sure what composites you're researching, but they sound like glass fiber. Carbon fiber is another story and answers your strength questions: the strength-to-weight ratio is higher for carbon fiber than steel and even higher than aluminum. Also, I'd bet that any carbon fiber materials you're likely to be able to purchase as a home user are not the ones you can get for building military or commercial aircraft.

sjmonte@4kenrich.com
User Rank
Iron
The interface - where true nano-molecular adhesion occurs in fiber reinforced thermosets. Zirconates and Titanates are different than Silanes
sjmonte@4kenrich.com   6/7/2012 10:26:35 AM
NO RATINGS
The limitation of Carbon and Aramid and Glass reinforced materials - as well as nano-materials - is a lack of awareness of the ability to use zirconate and titanate and aluminate coupling agents to bond the interface of the fiber reinforcement to the polymer resin.  Silanes - the material that made the Corvette possible (fiberglass reinforced peroxide cured unsaturated polyester) - have severe interfacial reaction and environmental aging issues due to the nature of their molecular bond formation.

Sal Monte

 

Key Words:

 

Silanes

Titanates

Zirconates

Aluminates

Fiber Reinforcement

Interface

Composites

naperlou
User Rank
Blogger
Re: Legacy materials fight back
naperlou   6/7/2012 10:07:24 AM
NO RATINGS
Rob, good point.  One of the "features" missing from the article is the fabrication difficulty.  In aerospace and some high end applications, where the systems will last a long time, it is worth paying up front for more difficult fabrication.  I think it was on this site that a new technique for welding titanium was discussed.  This is just one example.  Aluminum is also more difficult to weld than steel.  Recall that most aircraft, which have used aluminum for a long time, are riveted.  Jaguar started making the bodies of their high end XJs of aluminum.  When they did that they save 500 pounds (on a 4,000+ pound vehicle).  Many wondered if they would ever recover the cost of the production line changes that had to be made.  As you mention, steel may end up getting better before price or process technology catches up for the other materials.  In addition, steel and aluminum are eaisly recyclable.

kf2qd
User Rank
Platinum
How Strong?
kf2qd   6/7/2012 10:05:11 AM
NO RATINGS
The question still comes down to HOW STRONG IS IT? Researching a homebuilt car and the material requirements for structural strength and the weight savings aren't always there for lighter materials as you need more of the lighter material for the same strength. Cars and trucks need the strength to protect the passenger and deal with environmental factors (salt on the roads in the winter, accidents with other vehicles) while aircraft have used aluminum (and tubing ans cloth) and much more sophisticatd design to save weight ans still be strong. Imagine the cost of a Semi-Monoque car body built by riveting the layers together, but that is the approach aircraft use because weight is a controlling factor. In Automobiles weight is less of a concern, and durability and passenger protection as cars are more likely to be involved in an accident.

And how well would carbon fiber stand up to something trying to pierce it in an acceident? Steel, on the other hand, can deform and contain an object trying to piece the passenger compartment.

Smaller aircraft have used some of the composites, but a small savings on a 2000lb aircraft doesn't make much of a difference as compared to a 200,000lb aircraft so the savings does not always scale very well.

Another question is the repair of the vehicle - Stell is easy to cut and weld and repaint. Aluminum to cut and rivet ans paint. Would composites require a whole new section, and would it be available in 2 or 4 years?

And some of the chemicals rused in composites require special handling and present a whole new set of hazards to those handling them.

Page 1/2  >  >>


Partner Zone
Latest Analysis
Enabling the Future is designing prosthetic appendages modeled more like superhero arms and hands than your average static artificial limbs. And they’re doing it through a website and grassroots movement inspired by two men’s design and creation in 2012 of a metal prosthetic for a child in South Africa.
In order to keep an enterprise truly safe from hackers, cyber security has to go all the way down to the device level. Icon Labs is making the point that security has to be built into device components.
Senior Technical Editor Chuck Murray gets the skinny on Harting Inc.'s 3D MID technology, which allows users to create a three-dimensional circuit board out of molded plastic.
Three days after NASA's MAVEN probe reached Mars, India's Mangalyaan probe went into orbit around the red planet. India's first interplanetary mission, and the first successful Mars probe launched by an Asian nation, has a total project cost of nearly $600 million less than MAVEN's.
Siemens PLM Software has made an in-kind donation of software to Central Piedmont Community College in North Carolina for its science, technology, engineering, and mathematics (STEM) Division.
More:Blogs|News
Design News Webinar Series
9/25/2014 11:00 a.m. California / 2:00 p.m. New York
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Oct 20 - 24, How to Design & Build an Embedded Web Server: An Embedded TCP/IP Tutorial
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


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 Class: September 30 - October 16
Sponsored by Littelfuse
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service