Process for preparing a rubber scrap composition

Details Process for preparing a rubber scrap composition Process for preparing a rubber scrap composition

1988-05-16

1989-07-25

Lieberman, Allan M.

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

Synthetic resins

Treating polymer containing material or treating a solid...

264109, 525197, 525198, 525212, 528502, 521 41, 521 43, 521 455, C08L 1700

Patent

active

048515000

ABSTRACT:
A process and apparatus is provided for making a rubber-like product from rubber scrap, such as recycled tire scrap. The process includes mixing the rubber scrap with from 1 percent to 15 percent, with respect to the weight of the rubber scrap, of added sulphur, and applying a pressure thereto of about 1000 to 3000 pounds per square inch for 1 to 10 minutes at a temperature of from about 250 degrees F. to about 450 degrees F. In addition, 1 to 8 percent, with respect to the weight of the rubber scrap, of antioxidants and antiozonants are added to the mixture of rubber scrap and sulphur. The sulphur is free sulphur. Derivative sulphur compounds, or like vulcanizing agents, can be added in place of the free sulphur of about 1 to 45 percent of the weight of the rubber scrap. The rubber scrap is buffing of recycled tire rubber, or powder made from recycled tire rubber. An apparatus for carrying out the process is also provided. The apparatus includes a heavy duty mixer for making the mixture of the rubber scrap and sulphur and antioxidants and antiozonants. The apparatus also includes a compression molding and heating apparatus for applying the pressure and temperature to the mixture. The process is particularly suitable for making roofing products.

REFERENCES:
patent: 2809944 (1957-10-01), Sverdrup
patent: 3027599 (1962-04-01), Pluhacek et al.
patent: 4101463 (1978-07-01), Morgan et al.

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