High-modulus composite modified asphalt material based on natural asphalt and preparation method of high-modulus composite modified asphalt material

By dispersing and separating natural asphalt, combining alkaline treatment and dynamic crosslinking polymers, high-modulus composite modified asphalt materials are prepared, which solves the problem of easy softening and weak UV aging resistance in high-temperature seasons, and achieves the improvement of high modulus and weather resistance.

CN120424512AActive Publication Date: 2025-08-05LIAONING RENTAI TRANSPORTATION TECH CO LTD +1
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Patent Information

Application Number
CN202510947586.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-10
Publication Date
2025-08-05
Estimated Expiration
2045-07-10

AI Technical Summary

Technical Problem

Existing asphalt materials are prone to softening and deformation during high temperature seasons, and have weak UV aging resistance, making it difficult to meet the high modulus and weather resistance requirements of heavy-duty traffic roads and high altitude areas. The existing modifiers have problems such as poor compatibility, high cost and poor UV resistance.

Method used

By dispersing and fractionating natural asphalt into polymer asphaltene sections and medium and low molecular colloid sections, combined with alkaline treatment, dynamic crosslinking polymers and organic modified clay and phenylated chitosan, high-modulus composite modified asphalt materials are prepared to enhance interfacial compatibility and UV resistance.

Benefits of technology

It realizes composite modified asphalt materials with high modulus and excellent weather resistance, improves the high temperature stability and UV aging resistance of asphalt pavement, and meets the needs of wide temperature range applications.

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Abstract

The invention belongs to the technical field of asphalt preparation, and provides a high-modulus composite modified asphalt material based on natural asphalt and a preparation method thereof. The method comprises the following steps: separating natural asphalt into a high-molecular asphaltene section and a medium-low-molecular colloid section, and preparing activated asphaltene and colloid sections through alkali treatment and spray drying; a styrene-butadiene-styrene block copolymer and a polyurethane prepolymer are taken as the basis, and a dynamic cross-linked polymer is synthesized through the steps of hydrazide treatment, boric acid group introduction, glutaraldehyde cross-linking and the like; organic modified clay and phenylated chitosan are prepared, a polyaniline composite material is prepared through in-situ polymerization of aniline, a PANI-clay-biomass compound is obtained, the ultraviolet absorption characteristic of polyaniline and the shielding effect of montmorillonite cooperate, the ultraviolet aging resistance of the material is improved, through multi-stage temperature control dispersion, the anti-aging performance of the material is improved, and the anti-aging performance of the material is improved. The various modified materials are compounded with a natural asphalt substrate to obtain the high-modulus composite modified asphalt material based on the natural asphalt.
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