A kind of environment-friendly asphalt and preparation method thereof

Abstract

The invention relates to an environmentally friendly asphalt, which comprises the following components: 100 parts by weight of raw materials, 1-20 parts by weight of modifier, and 1-20 parts by weight of accelerator. The raw materials are selected from aromatic heavy oil, coal tar pitch and modified One or two or more of asphalt. The preparation method is as follows: add modifier and accelerator to the raw material, mix and stir evenly, heat up to 120-350°C under the protection of nitrogen or argon, and polymerize at constant temperature for 1-20 hours; stop nitrogen or argon, at 0 ~30kPa pressure distillation, that is, the production of environmentally friendly asphalt. Compared with the prior art, the beneficial effect of the present invention is that the content of carcinogenic polycyclic aromatic hydrocarbons in raw materials is greatly reduced, there is no modifier and accelerator residue, and the accelerator can be recycled, and the produced environmentally friendly asphalt The benzo[a]pyrene (BaP) content is lower than 500ppm, which is of great significance to human health and environmental pollution control; the preparation method has simple and easy process, mild reaction conditions, favorable energy saving and consumption reduction, low cost and effective quick.

Description

technical field [0001] The invention relates to the technical field of coal tar pitch deep processing, in particular to an environment-friendly pitch and a preparation method thereof. Background technique [0002] Coal tar pitch is the residue of coal tar distillation and extraction fractions (light oil, phenol oil, naphthalene oil, washing oil and anthracene oil, etc.), and is a thermoplastic material with unique strong bonding ability, rich carbon and low ash, and Solid carbonaceous materials have excellent compatibility and affinity, high coking residual carbon value, easy graphitization of carbonized products, good penetration and wettability, cheap and easy to obtain, and are widely used in aluminum smelting, steel smelting, carbon Industry, refractory materials, building materials and road construction and other industries. Coal tar pitch contains many carcinogenic polycyclic aromatic hydrocarbons, especially the strong carcinogen benzo[a]pyrene, which seriously endan...

AI Technical Summary

Problems solved by technology

The process includes adding alkali substances to the reaction kettle to adjust the pH value, which undoubtedly increases the salt and alkali substances in the prepared asphalt, which is difficult to remove, increases the ash content of the asphalt, and affects its performance.