Production process of SBS modified asphalt

Abstract

The invention discloses a production process of SBS modified asphalt and belongs to the field of modified asphalt. The process comprises the steps of heating 100 parts of matrix asphalt to be from 125 DEG C to 145 DER C, serving 4-20 parts of SBS latex as a modifying agent, adding the modifying agent into the heated matrix asphalt, stirring until bubbles are vanished, namely after the moisture in the SBS latex is evaporated, heating the mixture to be from 160 DEG C to 170 DEG C, adding 1-8 parts of cosolvent and 0.1-0.8 parts of stabilizing agents, stirring for 1-2 hours for development, and obtaining the SBS modified asphalt. The particle size in the SBS latex is less than 5 micrometers, by adding the SBS latex into the hot matrix asphalt directly for stirring, the SBS latex can be dispersed into the hot matrix asphalt uniformly, and swelling and crosslink are achieved between the SBS latex and the matrix asphalt for forming the modified asphalt. According to the production process of the SBS modified asphalt, the process is simple, the equipment investment is low, the energy is saved, the energy consumption is achieved, and the SBS modified asphalt which is prepared through the method is better than the SBS modified asphalt which is prepared with the solid SBS as modifying agents in performance.

Description

technical field [0001] The invention relates to the technical field of modified asphalt, in particular to a production process of SBS modified asphalt. Background technique [0002] At present, the production of SBS modified asphalt in my country's highway industry is mostly made by adding solid thermoplastic elastomer SBS to base asphalt at 170-185°C for mixing and premixing, and then grinding through a colloid mill to develop for a long time. The process depends on the colloid mill. To shear and grind SBS to a certain size and improve its miscibility with the base asphalt, a large-power motor is required, and the power consumption is large; if the colloid mill is not used for direct stirring and development, for Ensuring the complete dissolution of SBS will greatly prolong the production time, and it will consume more energy to maintain the temperature. At the same time, long-term high temperature will also accelerate the aging of asphalt and affect the performance. Cont...

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Problems solved by technology

The process depends on the colloid mill. To shear and grind SBS to a certain size and improve its miscibility with the base asphalt, a large-power motor is required, and the power consumption is large; if the colloid mill is not used for direct stirring and development, for Ensuring the complete dissolution of SBS will greatly prolong the production time, and it will consume more energy to maintain the temperature. At the same time, long-term high temperature will also accelerate the aging of asphalt and affect the performance of the asphalt.

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