SULPHUR POLYMERIC GREENCRETE™
comparison, property characteristics and applications
Polysulfide material GreenCrete™ is characterized by TU 21 1220 — 001 — 91846079-12 and safety data sheets. Composition GreenCrete™: 99,5% (wt.) Sulfur less than 0.5% (wt.) Of organic and inorganic additives — stabilizers. As stabilizers comprises reacting with sulfur in the formation and processing of the polysulfide polymer chain. In contrast to elemental sulfur, GreenCrete™ less polysulfide chain reaction-capable, and therefore can interact with the bitumen at the temperature at 30-40 °C higher (160 °C) than without elemental sulfur byproduct hydrogen sulphide. This leads to a wider range of different structuring bitumen composition without emission of toxic gases.
GreenCrete™ material available in the form of 2 modifications which differ indicator «degree of polymerization» — polymeric structures fraction insoluble in carbon disulfide. Production of the two species is different technological parameters and reagents used.
GreenCrete™ has a degree of polymerization of 20-25%. The material is cheaper and technologically to manufacture. The inorganic polymeric elastomer (linear) sulfur — has the same characteristic properties as rubbers based on diene — similar elastic moduli and reversible deformation of the order of 600-1000% and is amorphous, crystallizes poorly in normal polymer. Supramolecular GreenCrete ™ structure identical uncured rubber. Therefore GreenCrete™ can successfully replace partially or fully SBS additives in polymer-bitumen binder.
Super GreenCrete™ has a degree of polymerization of 75-80%. A high proportion of cross-linked structures leads to the formation on the surface of the porous building material resistant to water and corrosive environments protective film.
GreenCrete™, is used as the binder component serobitumnogo that compared with bitumen, characterized by increasing the depth of needle penetration at 25°C and 0°C and reduced brittleness temperature. Increasing extensibility at 0°C, with a total cementitious plasticization occurs due to a larger structure ordering bitumen dispersion medium and improve its elasticity. plasticizing mechanism is due to the destruction of the structural frame of the coagulation by adsorption of bitumen and sulfur interaction with the active groups of the structure-forming components. Start fixing sulfur polymer structure additives can improve its strength and deformation characteristics, resistance to aggressive media by stabilizing it in a polymer state. Tests have also shown high efficiency GreenCrete™ polymer-bitumen binder as a component to stabilize the structure of the latter.
Super GreenCrete™ produces waterproofing film on the surface of the building material through active interaction with the silicate and formation of thin (1-2 mm) serokompozitnogo layer with a high resistance to aggressive environments: acids, bases, radiation. In order to form a stable film preheated material — concrete, brick — processed wetting liquid Super GreenCrete™.