Rubber powder modified asphalt with low harmful flue gas emission and preparation method thereof

By chemically modifying DOPO and loading it into a porous carrier, a composite modified system of confined storage, slow release, and synergistic reaction was constructed, which solved the problem of large emissions of harmful fumes during high-temperature construction of rubber-modified asphalt and achieved continuous suppression of harmful fumes and performance improvement.

CN122405014APending Publication Date: 2026-07-17SHANXI CONSTR ENG GROUP CORP +1
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Patent Information

Application Number
CN202610879904.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing rubber-modified asphalt emits large amounts of harmful fumes and has insufficient anti-aging properties during high-temperature construction. Furthermore, existing technologies have failed to establish an effective slow-release regulation mechanism, making it difficult to achieve a continuous and stable inhibition effect.

Method used

By chemically modifying DOPO and loading it into a porous support, a composite modified system of confined storage, sustained release, and synergistic reaction is constructed. The pore structure of the porous support and the long-chain alkyl modification reduce the reactivity of DOPO, thereby achieving a sustained release effect.

Benefits of technology

It significantly reduces the emission concentrations of H2S and VOCs, while improving the high-temperature stability and anti-aging properties of asphalt, achieving continuous suppression of harmful smoke emissions and synergistic optimization of performance.

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Abstract

The invention belongs to the technical field of road engineering materials, and particularly relates to rubber powder modified asphalt with low harmful flue gas emission and a preparation method thereof. The preparation method comprises the following steps: loading 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) modified by long-chain alkyl on a porous carrier to form a composite modifier, and modifying rubber powder modified asphalt. The porous carrier is used for limited storage of DOPO, and the chemically modified DOPO is released in a slow release manner in a heating process and participates in a free radical reaction and a sulfur-containing volatile matter capture reaction in an asphalt system, so that emission of H2S and volatile organic compounds (VOCs) is reduced. The composite system can improve the high-temperature stability and the anti-aging performance of the asphalt at the same time. According to the invention, cooperative regulation and control of emission reduction of harmful flue gas and improvement of pavement performance are realized.
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