Continuous ultrasonic devulcanization of valcanized elastomers

Details Continuous ultrasonic devulcanization of valcanized elastomers Continuous ultrasonic devulcanization of valcanized elastomers

1992-06-22

1993-11-02

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

521 40, 521 405, 521 41, 521 415, 521 445, C08F 246, C08F 4724

Patent

active

052584135

ABSTRACT:
This invention relates to a continuous ultrasonic method 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: 3725314 (1973-04-01), Pelofsky

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