LOW-TEMPERATURE METHOD OF PRODUCING MODIFIED RUBBER CRUMBS Russian patent published in 2020 - IPC C08L17/00 C08J11/04 C08L95/00 

FIELD: construction materials.

SUBSTANCE: invention relates to road construction materials and is intended to improve the quality of road surfaces, roofing and insulation materials based on bitumen, achieved by improving bitumen quality by using modified rubber crumbs – recycling waste motor vehicle industry, tires, in particular, the invention relates to a low-temperature method of producing modified rubber crumbs. Method involves production of a mixture of the following components: rubber crumb from spent motor vehicle tires with particles of up to 1 mm – 50–65 wt%, CaO and/or MgO, and/or Ca(OH)₂ – 10–20 wt%, oil of selective viscosity purification at 60 °C from 0.05 to 1.5 Pa*s – 20–30 wt%, amine type antiageing agent – heterocyclic nitrogen-containing compound – 0.1–2.0 wt%. Then, components of obtained mixture are mixed with impact-shear load on material in mixer activator at temperature 80–120 °C and further cooling of the resulting mixture to room temperature.

EFFECT: technical result consists in obtaining improved quality of modified crumbs, not susceptible to destruction in long-term storage, as well as having no unpleasant toxic smell.

4 cl, 3 dwg, 8 tbl, 6 ex