High-performance rubber asphalt and preparation method thereof

Abstract

The invention discloses high-performance rubber asphalt and a preparation method thereof. The high-performance rubber asphalt comprises the following components in parts by weight: 80 parts of asphalt, 18 parts of tire rubber powder, 1 part of gutta-percha, 0.5 part of butadiene, 0.4 part of sulfur, 0.05 part of an initiator and 0.05 part of an antioxidant. In the preparation process, firstly, a high-temperature mixing process is adopted, the tire rubber powder is placed in an internal mixer for independent internal mixing, and then a small amount of auxiliaries are added into the internal mixer. Through the high-temperature action and mechanical shearing action of an internal mixer, tire rubber powder is subjected to a physical and chemical reaction to become cured rubber powder, and then the cured rubber powder is mixed with asphalt for development, so that the high-performance rubber asphalt material is obtained. The formula of the rubber modifier is improved, and a high-temperature mixing process is combined, so that the pavement and durability of the modified asphalt are greatly improved, meanwhile, the problem of construction difficulty caused by over-high viscosity of the rubber asphalt is solved, and the preparation process is simple, economical, environment-friendly and suitable for various road engineering environmental conditions.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a high-performance rubber asphalt and a preparation method thereof. Background technique [0002] Rubber asphalt is a new type of high-quality composite material. It is a modified asphalt cementitious material obtained by reacting tire rubber powder with a content of more than 15% with asphalt under high temperature and fully mixed conditions. Because recycled tires are used as the main material for modification, it not only has a cost advantage compared with ordinary modified asphalt, but also can solve the environmental problems caused by waste tires, which has important social and economic value and strategic significance. Therefore, the current The application of rubber asphalt in road engineering is more and more extensive. Compared with other modified asphalt materials, rubber asphalt has obvious advantages in road performance, specifically: it can significantly...

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Problems solved by technology

[0003] However, in the prior art, since the rubber powder particles in the rubber asphalt are difficult to completely dissolve, the rubber powder is suspended in the matrix asphalt in the form of particles, and certain segregation will occur during transportation and use after the mixing is completed, making the upper part of the rubber asphalt and The performance of the lower part varies greatly, making it difficult to maintain stability

Chinese patent CN105348828A describes a preparation process of rubber asphalt, its blending ratio is: waste tire rubber powder 82-92%, activator 2-4%, binder 2-5%, activator 2-4% , vulcanizing agent 1-3%, antioxidant 1-2%, this modification plan proposes to improve rubber asphalt with additives such as vulcanizing agent and activator, but its storage stability is still difficult to maintain a good state

[0004] In addition, the rubber-modified asphalt in the prior art is generally developed by directly mixing tire rubber powder with asphalt or high-speed shearing and then heat preservation, which results in poor dispersion performance among various materials in the production process of rubber asphalt. As a result, the viscosity of the modified asphalt increases significantly, and the workability of the construction becomes poor, which seriously affects the road use, performance and construction quality of the rubber asphalt

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