Researchers Tackle Mountains Of Used Tires
Rubatex Msds Two projects underway at the University of Massachusetts (UM) could help reduce the numbers of used tires headed for the nation's landfills.
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Rubatex Neoprene One of team of UM researchers is looking at new methods of recycling old tires into new rubber goods. A second is developing a novel substance that is a combination of asphalt and recycled tires, and could be used in products as varied as roadways, construction materials, and roofing shingles.
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Rubatex Pipe Both research groups are part of the polymer science and engineering department.
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Rubatex Pipe Insulation "Rubber is one the most useful materials of the modern era, and helped spawn the industrial revolution," said professor Richard Farris. "It is prized in industry for its strength, elasticity and wear resistance."
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Rubatex 180 "Unfortunately, rubber also represents one of the most difficult recycling problems ever encountered," added Farris. "One of the biggest pollution problems in this country is scrap tires. Although it's easy to collect, rubber is difficult to recycle. It's chemically cross linked, and those links will not melt and will not dissolve."
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Rubatex 180 Fs Researchers estimate that there are about two billion scrap tires now piled in U.S. landfills, with more than 273 million additional tires reaching the waste stream each year.
Rubatex 1800 "This adds up to approximately 3.6 million tons of waste each year, or 230 pounds of rubber reaching the waste stream per second," noted Drew Williams, a doctoral candidate studying the issue. "Of these 273 million tires, about 170 million are burned for fuel, and 60 million are used in low tech ways, such as for synthetic turf for athletic fields. The remaining 40 million tires end up in landfills."
Rubatex 320 The team led by Farris is revisiting and improving a process introduced in 1853 by Goodyear, in which the reclaimed rubber is ground into a fine powder and mixed with unvulcanized rubber. The mixture is then vulcanized: that is, the material is heated and new cross links are formed, via the additional sulfur or other reactive materials, in order to restore its strength and elasticity.
Rubatex 373 Just five percent of scrap tires are now used this way because of quality concerns, Farris said. His team has developed a method to create a rubber material containing 100 percent reclaimed rubber, without compromising the material's quality.
Rubatex Rubber Williams is developing a material that combines rubber and asphalt into a product that withstands traditional asphalt's tendency to melt or become sticky in hot weather, and remains very flexible even at very low temperatures.
Rubatex Tape "These projects really represent 'green' chemistry at its best," said Farris. "We're generating lower amounts of waste, and reclaiming used materials, and all we're adding is heat and pressure."
ENS - 3/6/2002
Topic: Recycling
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