Abstract:
An impact mill including a base portion on which is disposed a rotor rotatably mounted in a bearing housing, the rotor having an upwardly aligned cylindrical surface portion coaxial with the rotational axis. The impact mill is provided with a mill casing within which is located a conical track assembly which surrounds the rotor to form a conical grinding path. The mill casing is provided with a downwardly aligned cylindrical collar which may be axially adjusted to set a grinding gap between the rotor and the mill casing. The rotor is provided with a plurality of impact knives complementary with a plurality of impact knives disposed on the inside top surface of the mill casing. In addition, the impact mill can be formed of separated conical sections. Finally, power is transmitted to the rotor of the impact mill by a synchronous sprocketed belt, accommodated by a sprocketed drive sheave.
Abstract:
Un procedimiento de fabricación de caucho granular y en polvo mediante el enfriamiento de partículas cribadas de caucho granulado con una corriente de una pulverización líquida criogénica y una corriente de gas de enfriamiento que comprende (a) granular una carga inicial de partículas de caucho usado tras la eliminación de cualquier fragmento extraño de metal; (b) eliminar el metal ferroso de dichas partículas de caucho granulado producidas en la etapa (a); (c) cribar y eliminar de forma concurrente la fibra de dichas partículas de caucho granulado producidas en la etapa (b); (d) enfriar dichas partículas cribadas de caucho granulado que tienen un intervalo predeterminado de tamaño de partícula producidas en la etapa (c) con la corriente de una pulverización líquida criogénica y la corriente de gas nitrógeno frío vaporizado reciclado que fluye de modo concurrente en la misma dirección que las partículas cribadas de caucho granulado estando controlada la temperatura enfriada final de las partículas y eliminándose el metal ferroso y la fibra de las partículas cribadas de caucho granulado de forma subsiguiente a la etapa (c), pero con anterioridad a la etapa (d); (e) triturar dicha corriente de partículas de caucho enfriadas variando la velocidad de la superficie de impacto, estando controlada dicha distribución del tamaño de partícula de dichas partículas de caucho triturado; y (f) cribar dichas partículas de caucho triturado a los intervalos deseados de tamaño de partícula de caucho granular y/o en polvo.
Abstract:
Un molino de impacto (100) incluye una porción base sobre la cual se coloca un rotor (3) instalado de manera giratoria en un alojamiento de soporte, teniendo el rotor una porción de superficie cilíndrica alineada ascendentemente, coaxial con el eje rotacional. El molino de impacto incluye un armazón de molino dentro de la cual se localiza una instalación de curso cónico (5) que rodea el rotor para formar una trayectoria cónica de trituración. El armazón de molino incluye un collar cilíndrico (11) alineado descendentemente que puede ajustarse axialmente para establecer un espació de trituración (S) entre el rotor y el armazón de molino. El rotor incluye una pluralidad de cuchillas de impacto complementarias con una pluralidad de cuchillas de impacto colocadas en la superficie superior interna del armazón de molino. La instalación de curso cónico (5) puede ser una serie de secciones cónicas ensambladas o una unidad con un número variado de serraciones en ya sea una configuración vertical o inclinada. Esta flexibilidad permite mayor compatibilidad con la materia prima que se tritura.
Abstract:
Curable elastomer compositions are described which include particles of reclaimed elastomeric material having a particle size of 60 mesh or smaller, sulfur and one or more accelerators, wherein the ratio by weight of the one or more accelerators to sulfur in the composition is at least 1:1. Curable styrene butadiene rubber (SBR) elastomer compositions are also described which include reclaimed elastomeric material, sulfur and one or more accelerators, wherein the ratio by weight of the one or more accelerators to sulfur in the composition is at least 1:1. The cured elastomeric compositions exhibit improved physical properties compared to elastomer compositions containing reclaim material which employ conventional high sulfur cure systems.
Abstract:
A process of producing powder rubber having a particle size in the range of between about 50 microns and 180 microns is described. The process removes metal, fiber and other foreign materials from ground used tire rubber particles. The processed used tire rubber particles are embrittled by contact with a cryogenic liquid. The embrittled rubber particles are milled in a conical mill. The comminuted rubber particles exit the conical mill at a temperature in the range of between -15 degrees C and -30 degrees C. The powder rubber produced can vulcanize as easily or even more easily than virgin rubber.
Abstract:
An impact mill (100) including a base portion on which is disposed a rotor (3) rotatably mounted in a bearing housing, the rotor having an upwardly aligned cylindrical surface portion coaxial with the rotational axis. The impact mill includes a mill casing within which is located a conical track assembly (5) surrounding the rotor to form a conical grinding path. The mill casing includes a downwardly aligned cylindrical collar (11) which may be axially adjusted to set a grinding gap (S) between the rotor and the mill casing. The rotor includes a plurality of impact knives complementary with a plurality of impact knives disposed on the inside top surface of the mill casing. The conical track assembly (5) can be a series of assembled conical sections or one unit with varied number of serrations in either a vertical or sloped configuration. This flexibility allows for greater compatibility with the feedstock being milled.
Abstract:
A process of producing powder rubber having a particle size in the range of between about 50 microns and 180 microns is described. The process removes metal, fiber and other foreign materials from ground used tire rubber particles. The processed used tire rubber particles are embrittled by contact with a cryogenic liquid. The embrittled rubber particles are milled in a conical mill. The comminuted rubber particles exit the conical mill at a temperature in the range of between -15 degrees C and -30 degrees C. The powder rubber produced can vulcanize as easily or even more easily than virgin rubber.
Abstract:
Thermoplastic elastomers comprising micronized or pulverized rubber powders are disclosed having physical properties equivalent to those of virgin thermoplastic elastomers. For example, the use of finer mesh MRP (e.g., particles of size that would pass through 40 mesh or smaller) to manufacture thermoplastic elastomers results in thermoplastic elastomers that have physical properties equivalent to those of virgin thermoplastic elastomers. Similarly, the use of an glycidyl functional terpolymer (optionally in combination with trimellitic anhydride or "TMA") to manufacture thermoplastic elastomers comprising MRP results in thermoplastic elastomers that have physical properties equivalent to those of virgin thermoplastic elastomers. Moreover, the use of styrene-ethylene/butylene-styrene thermoplastic (e.g., "SEBS") in place of the base polypropylene thermoplastic elastomer to manufacture thermoplastic elastomers comprising MRP also results in thermoplastic elastomers that have physical properties equivalent to those of virgin thermoplastic elastomers.
Abstract:
Asphalt modifier packages and rubber-modified asphalts including the packages are described. Asphalt modifier packages can include an amine functionalized wax and an elastomeric polymer in conjunction with ground tire rubber. Asphalt modifiers can include a ground tire rubber compounded with a reactive elastomeric terpolymer. Rubber-modified asphalts can exhibit an excellent stability of the ground tire rubber additive. Rubber-modified asphalts can exhibit a storage stability separation factor of about 6° F. or less, an MSCR Jnr value of from about 0.05 to about 2 at 3.2 kPa and 67° C., and an MSCR percent recovery of from about 20% to about 75% at 3.2 kPa and 67° C.
Abstract:
Thermoplastic elastomers comprising micronized or pulverized rubber powders are disclosed having physical properties equivalent to those of virgin thermoplastic elastomers. For example, the use of finer mesh MRP (e.g., particles of size that would pass through 40 mesh or smaller) to manufacture thermoplastic elastomers results in thermoplastic elastomers that have physical properties equivalent to those of virgin thermoplastic elastomers. Similarly, the use of a glycidyl functional terpolymer (optionally in combination with trimellitic anhydride or “TMA”) to manufacture thermoplastic elastomers comprising MRP results in thermoplastic elastomers that have physical properties equivalent to those of virgin thermoplastic elastomers. Moreover, the use of styrene-ethylene/butylene-styrene thermoplastic (e.g., “SEBS”) in place of the base polypropylene thermoplastic elastomer to manufacture thermoplastic elastomers comprising MRP also results in thermoplastic elastomers that have physical properties equivalent to those of virgin thermoplastic elastomers.