- Jul 11, 2007
Ford's bio-foam and bio-plastics: Plants aren't just for fuel anymore
Modern vehicles contain 30-40 lbs of foam each. For the 2.9 million vehicles that Ford builds annually thats about 90 million pounds of foam and a lot of oil to produce it. Then there is all the plastic trim, panels, polyester carpeting, headliners and more. Henry Ford was one of the pioneers in experimenting with using soy to make various car parts back in the twenties and thirties. For the past seven years, Dr. Deb Mielewski has been leading a team focusing on developing new materials for automotive use using plant based products including soy, corn, hemp and other plants.
Continue reading after the jump.
[Source: Ford] Soy foams were one of the first areas of development but when they initially tried substituting the soy oils for the petroleum based materials, the results were totally unacceptable. The foam had no strength and entirely inappropriate properties for the applications they were looking for and many people thought it would never work.
Then researchers at Ford began experimenting with new formulations and combinations of soy and other materials and eventually came up with a combination that consists of forty percent soy that meets the performance requirements. They've also worked diligently with suppliers on the processes to produce these new foams. Ford first showed soy foam in the Model U concept in 2003 and will probably start rolling out this new material in production in the next couple of years.
Currently cars and trucks contain an average of about 300lbs of plastics per vehicle. A lot of that plastic is fiber glass reinforced and the glass fibers are both heavy and hazardous to work with. Another area Ford is experimenting with is using natural fibers like hemp and kenaf as a reinforcing medium in plastics. The natural fibers are both easy grow requiring no fertilization and they grow well in poor soil, but they also weigh a lot less than glass. Hemp-reinforced plastic parts weigh up to thirty percent less than their fiber glass counterparts. The main technical issue they still need to overcome is reformulating the resins so that they adhere better to the fibers. Current resins have been developed for compatibility with glass fibers. There is also that pesky issue of ridiculous drug laws in the United States that prevent the cultivation of industrial hemp.
The resins themselves are another area of bio development. Since polymers are composed of long chains of hydro-carbon molecules, they are primarily made from petroleum products. Ford is working on developing polylactic acids that can be used to make polymer resins and would be completely biodegradable. One of the goals is to produce a material that will last the lifetime of the vehicle and could then be triggered to decompose. One concept is to have the material compost in the presence of a specific microbe. At that point the material basically goes back to dirt and can be used to grow new crops to produce more of the material.
All of these efforts can help to reduce petroleum dependence before a vehicle ever burns a drop of fuel by reducing the amount of petroleum that goes into production. Lighter-weight materials help make the vehicle more efficient to operate and biodegradable materials ease disposal.
FORD MOTOR COMPANY DEVELOPS THE INDUSTRY'S FIRST 40 PERCENT SOY-BASED POLYURETHANE FOAM
- Ford Motor Company scientists have reached a breakthrough with renewable soy-based polyurethane seat foam – allowing up to 40 percent of the standard petroleum-based polyol to be replaced with a soy-derived material.
- Ford is leading the industry by developing environmentally renewable materials solutions, including seat fabric offered in the 2008 Ford Escape and Ford Escape Hybrid that is made from recycled materials.
- Other environmentally and business friendly technologies are being explored for production, including renewable fiber reinforced plastics.
DEARBORN, Mich., July 10 – Scientists at Ford's Research and Innovation Center are hailing a major breakthrough with soy-based polyurethane foam - the primary substance that makes up a vehicle's seat cushions, seat backs, armrests and head restraints.
While many in the automotive industry are experimenting with a 5 percent soy-based polyol - one of the many ingredients used to create the foam used in vehicles - Ford researchers have formulated the chemistry to replace a staggering 40 percent of the standard petroleum-based polyol with a soy-derived material. And they are doing it without compromising the durability, stiffness or performance of the foam.
"Five percent is relatively easy, a nice walk-before-you-run application, but there really isn't a solid business case to do it," says Matthew Zaluzec, manager of Ford's Materials Research & Advanced Engineering Department.
"At 40 percent, which was formulated in our lab by our researchers, we have the ability to make a significant impact on the environment while reducing our dependency on imported petroleum."
Initial projections estimate that using a soy-based foam at high volumes could represent an annual material cost savings of as much as $26 million. As for the potential environmental benefit, according to the National Institute of Standards and Technology, soy polyols have only one-quarter the level of total environmental impact of petroleum-based ingredients.
Friend to the Environment
Ford first showcased its industry-leading work with soy foams in 2003 on the Model U concept, which featured soy-based seat cushions as well as a soy-based resin composite tailgate. Ford's research of possible applications for soybean products, however, actually dates back to the company's early years. The Model T, for example, once contained 60 pounds of soybeans in its paint and molded plastic parts.
"Soy is a very green, renewable resource," says Debbie Mielewski, technical leader for Ford's Materials Research & Advanced Engineering Department. "Using a soy-based foam gives us the opportunity to conserve natural resources and reduce our environmental footprint."
Most automotive manufacturers today use a 100 percent petroleum-based polyol foam. Per year, the U.S. market for this material is 3 billion pounds - 9 billion pounds worldwide. Mielewski says an average of 30 pounds of petroleum-based foam is used in each vehicle produced, making a strong case for auto manufacturers to consider and research other renewable, more environmentally friendly materials to produce the foam.
To protect its scientific advancements with soy-based foams, Ford has applied for two patents, one for high-content soy foam formulations and the other for a novel, low-odor process to synthesize polyols.
For some time, Ford researchers had been hitting a roadblock with the 40 percent soy-based foam because of its odd odor, reminiscent of vegetable oil. Ford formulation chemist Christine Perry says that issue is now resolved, thanks to a new synthesis method for soy polyol, developed and tested at Ford's Research and Innovation Center. The new process uses room-temperature ultraviolet light instead of high heat and catalysts to make the soy polyol.
"Using high temperatures for the chemical reaction can cause numerous side products, which produce the rancid odor," says Perry. "It also requires a metal catalyst and more energy. With our breakthrough UV process, we have a simple reaction that is readily controlled by time of exposure. Plus, it is inexpensive and reduces the odor."
The actual foam is created by combining the 40-60 blend of soy- and petro-based polyol with an isocyanate cross-linking agent and nine other additives in precise combinations.
"We have done a lot of work on the formulation," says Cynthia Flanigan, a technical specialist with Ford's Materials Research & Advanced Engineering. "Because none of the additives is independent of one another, when you make a change to one, it affects all the others."
Extensive testing of high and low soy percentages revealed that a 40- to 50-percent soy substitution produced a product with properties most similar to the 100 percent petroleum-based polyol foam.
For Ford, the end product is a soy-based foam that exhibits the desired automotive properties for seating applications such as seat cushions, seat backs, armrests and head restraints. The foam's chemistry can be altered as needed, depending on factors such as the geometry of a part or required hardness of the foam.
Ford is working in conjunction with other organizations and suppliers to bring these innovative technologies to the mainstream as quickly as possible. Several companies have already expressed interest in licensing them.
Auto parts supplier Lear Corp. has conducted head restraint trials with the 40 percent soy foam, measuring how it performs with a variety of production head restraint tools used for Ford vehicles. Bayer MaterialScience LLC has made significant contributions to the foam's formulation development.
For the past three years, the project has received funding from the United Soybean Board, a group of farmers and leaders that oversees investments in soy-based technologies. To date, Ford is the only auto manufacturer financially supported by the United Soybean Board.
"We are certain that many of Ford's competitors are watching the company's efforts very closely with the idea of emulating any success Ford has with soy-based cushioning," says Todd Allen, chairman of the USB's New Uses Committee. "We believe that when the first soy foams are introduced on Ford vehicles, that will have a snowball effect on the usage of soy polyols by other industries such as agriculture equipment, recreational vehicles, office furniture cushioning and other automotive components."