A kind of anti-ultraviolet aging SBR modified asphalt and preparation method thereof

Abstract

The invention relates to a UV aging-resistant SBR modified asphalt and a preparation method thereof, characterized in that, the UV aging-resistant SBR modified asphalt is composed of 7-30% of ultraviolet blocking modifier particles mixed with a mass fraction of 70% ~93% base asphalt; the UV barrier modifier particles are made of SBR modifier, magnesium-aluminum layered double hydroxide UV barrier material, compatibilizer and reclaimed rubber through banbury mixing equipment kneading and mixing 20% to 60% of magnesium-aluminum layered double hydroxide UV blocking material; 25% to 35% of reclaimed rubber; 12% to 18% of compatibilizer; 25% of SBR modifier %~45%. The modified asphalt prepared by the present invention can not only withstand high temperature in summer and low temperature and severe cold in winter, but also play a good role in physical reflection, shielding and chemical absorption of ultraviolet rays in plateau areas, which can reduce early-stage diseases of the road surface and greatly prolong the use of asphalt pavement It can be used in the construction of high-grade highways in plateau areas.

Description

technical field [0001] The invention relates to the technical field of modified asphalt for road engineering, in particular to modified asphalt suitable for areas with strong ultraviolet rays in the Tibetan Plateau region and a preparation method thereof. Background technique [0002] With an average altitude of more than 4,000 meters, the Tibet Autonomous Region is the main part of the Qinghai-Tibet Plateau and is known as the "roof of the world". The annual average sunshine hours in Lhasa are about 3005 hours. The atmosphere here is weak, with less water vapor and dust content, and good transparency. When sunlight passes through the atmosphere, energy is lost, so it is the area with the most solar radiation in the country. Tibet is one of the areas with the strongest ultraviolet light in the world. Asphalt is an organic macromolecular material, which is highly susceptible to photo-oxidative aging due to the influence of ultraviolet radiation, which further deteriorates ...

AI Technical Summary

Problems solved by technology

The aging and damage of the asphalt pavement is serious. There are many broken roads on the national and provincial roads. The traffic capacity of the existing roads is poor. Except for the Qinghai-Tibet Highway, other trunk roads are seriously blocked due to various diseases

[0003] Ultraviolet light causes high energy density and strong destructiveness, which has a great impact on the structure and performance of SBS modified asphalt. Conventional modified asphalt cannot adapt to the current climate characteristics of strong ultraviolet rays in plateau areas such as Tibet and Qinghai. Patent CN102190957A proposes the use of magnesium-aluminum substrates Shaped dihydroxyl conforms to the excellent UV reflective properties of metal hydroxides to improve the UV aging resistance of SBS modified asphalt coating materials. Patent CN200810204209.4 proposes to compound UV absorbers in asphalt to improve the UV aging resistance of asphalt

However, this compound is prone to chemical changes such as volatilization and decomposition after the modified asphalt temperature reaches 180°C-190°C, and the desired effect cannot be achieved.

In addition, the above-mentioned technologies are all theoretical discussions. In practical applications, when the material is used as an additive in the production and processing of UV aging-resistant modified asphalt, it is difficult to miscible with the polymer compound of modified asphalt, and segregation is easy to occur. Caused transport tanker and asphalt mixing system to be paralyzed due to blockage

Therefore, the application of this material in UV aging-resistant modified asphalt has great technical difficulties.

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