Coal tar pitch for high-grade roads

Abstract

The invention discloses a coal tar pitch for high-grade roads, which consists of the following materials in part by weight: 85 to 90 parts of coal tar pitch, 6 to 10 parts of modifier and 4 to 5 parts of cosolvent, wherein the modifier consists of styrenic block copolymer SBS, waste plastics and star-shaped oligofluorene polymer; and the cosolvent is polyphosphoric acid. The coal tar pitch for the high-grade roads has strong tensile property, good temperature resistance, low manufacturing cost and convenient processing, improves the service value of the coal tar pitch, and relieves the condition that petroleum base pitch is short in supply.

Description

technical field [0001] The invention relates to a coal tar pitch, in particular to a coal tar pitch used for high-grade roads. Background technique [0002] my country started relatively late in the research and production of high-grade road asphalt, but has developed rapidly in the past ten years. From 1991 to 1998, the annual output of heavy-duty road asphalt increased from 50,000 tons to 1.29 million tons, with an annual growth rate of 59.1%, and increased to 6.53 million tons in 2002. Petroleum-based road asphalt is far from meeting the rapid development of national construction. need. At the same time, my country is a country with large coal resources. By 2002, my country's coke output will reach 150 million tons, ranking first in the world, and the corresponding coal tar pitch output will reach 6 million tons per year. Using coal tar pitch as the main raw material to produce high-grade road asphalt makes full use of my country's coal resources on the one hand and imp...

AI Technical Summary

Problems solved by technology

At present, most of the modifiers on the market are used as a single addition, and the mixed use has not yet received widespread attention

[0004] Coal tar pitch (referred to as coal tar pitch) is an industrial by-product with a wide range of sources and cheap prices. It is a complex mixture of various high molecular weight hydrocarbons. Its technical properties are basically similar to petroleum pitch, but it contains more Volatile oil and chemical components with poor stability, so its aging resistance time is short, its tensile strength and elongation are low, and its temperature resistance is poor. Cracking, short service life, hot construction is required, troublesome construction of complex structures, and pollution of the site, etc., its application has been restricted

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