A kind of preparation method of high-performance environment-friendly asphalt

Abstract

The invention relates to a preparation method of high-performance environment-friendly asphalt, which uses one or both of aromatic heavy oil and coal tar pitch as raw materials, and uses coal-based or petroleum-based aromatic oil with a benzo[a]pyrene content of less than 300ppm. Heavy oil is used as a regulator, which specifically includes the following steps: Raw materials are heated to 350-500°C at a rate of 0.1-10°C / min, and thermally polymerized under a pressure of 0.1-10MPa for 0.5-30 hours to obtain polymerized asphalt. Evaporate in an evaporator or a short-range evaporator to obtain high-softening-point environmentally-friendly asphalt, and then add a regulator with a mass of 5-50% of the high-softening-point environmentally-friendly asphalt to obtain low-softening-point environmentally-friendly asphalt. Compared with the prior art, the beneficial effects of the present invention are: the prepared environmentally friendly asphalt has high coking value, high performance of high β resin content, and more importantly, it has low toxicity, low pollution, strong carcinogenic benzo[a ] Pyrene (BaP) content is lower than 300ppm.

Description

technical field [0001] The invention relates to the technical field of deep processing of coal tar pitch, in particular to a preparation method of high-performance and environment-friendly pitch. Background technique [0002] Coal tar pitch is the residue of various fractions extracted from coal tar distillation. Due to its unique functions and characteristics such as strong bonding ability, thermoplasticity, high carbon residue value, and easy graphitization of carbonized products, it is cheap and easy to obtain. Therefore, whether in traditional fields such as carbon material industry, refractory material industry, construction industry, or in emerging fields such as aerospace, new energy, and new materials, coal tar pitch has been proved to be a very valuable product. However, with the development of modern industry, related industries put forward higher requirements for asphalt products. [0003] On the one hand, the application of coal tar pitch products must meet incr...

AI Technical Summary

Problems solved by technology

For example, my country's carbon material industry generally uses medium-temperature pitch (softening point is 75°C to 95°C) as a binder, and its disadvantages are: (1) The coking value is low (generally around 50%), and a large amount of volatile matter escapes , so that the porosity of roasted carbon products is large, and the performance of carbon materials is difficult to improve; (2) there are more light components, and more asphalt fumes escape during the process of asphalt melting, kneading, molding and roasting, which aggravates the impact on the environment. pollution; (3) contains less β resin, poor bonding performance

Ordinary medium-temperature asphalt or even modified asphalt can be used to produce ordinary carbon material products, but it cannot be used to produce high-strength and high-density high-performance carbon material products (such as high-power and ultra-high-power graphite electrodes, large-scale high-quality prebaked anode, microporous carbon brick, etc.), so it cannot meet the large-scale and high-performance requirements of modern carbon materials