Continuous ultrasonic devulcanization of vulcanized elastomers

Details Continuous ultrasonic devulcanization of vulcanized elastomers Continuous ultrasonic devulcanization of vulcanized elastomers

1993-06-16

1994-02-08

Michl, Paul R.

Chemical apparatus and process disinfecting, deodorizing, preser

Shock or sound wave

Including supersonic or ultrasonic energy generation means

521 455, B06B 100, C08F 256

Patent

active

052846253

ABSTRACT:
This invention relates to a continuous ultrasonic method and apparatus for breaking the carbon-sulfur (C--S), sulfur-sulfur (S--S), and if desired, carbon-carbon (C--C) bonds in a vulcanized elastomer. It is well known that vulcanized elastomers having a three-dimensional chemical network, cannot flow under the effect of heat and/or pressure. This creates a huge problem in the recycling of used tires and other elastomeric products. Through the application of certain levels of ultrasonic amplitudes in the presence of pressure and optionally heat, the three-dimensional network of vulcanized elastomer can be broken down. As a most desirable consequence, ultrasonically treated cured rubber becomes soft, thereby enabling this material to be reprocessed and shaped in a manner similar to that employed with uncured elastomers.

REFERENCES:
patent: 4168295 (1979-09-01), Sawyer
patent: 4379724 (1983-04-01), Kashiwagi

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