SBS (styrene-butadiene-styrene)/scrap rubber powder composite modified asphalt and preparation method thereof

Abstract

The invention relates to an SBS (styrene-butadiene-styrene) / scrap rubber powder composite modified asphalt which comprises the following components in parts by weight: 75-96 parts of matrix asphalt, 0.5-12 parts of scrap rubber powder, 0.5-6 parts of SBS, 0.2-8 parts of modified inorganic substance powder, 0.1-8 parts of compatilizer and 0.1-3 parts of crosslinking agent. The preparation method comprises the following steps: preparing the scrap rubber powder; heating the matrix asphalt to 160-180 DEG C, adding the compatilizer while stirring, and evenly mixing; adding the SBS scrap rubber powder and modified inorganic substance powder, stirring at the speed of 1000-5000 rpm for 5-125 minutes while keeping the temperature, and adding the crosslinking agent; and quickly stirring for 20-300 minutes while keeping the temperature. The key technical indexes of the product are higher than those of the SBS modified asphalt; and the invention enhances the high / low-temperature properties and aging resistance, prolongs the high-temperature storage stabilization period, and completely satisfies the property requirements for national high-grade roads.

Description

technical field [0001] The invention belongs to asphalt, in particular to a composite modified asphalt made of SBS and waste rubber powder and a preparation method thereof. Background technique [0002] At present, the use of high molecular polymer materials to modify asphalt as pavement materials has been widely used. As a modifier, the commonly used polymer materials include: 1. Thermoplastic elastomer (SBS) 2. Synthetic rubber (SBR) 3. Synthetic resin (PE) 4. Waste rubber powder and other materials. Among them, thermoplastic elastomer (SBS--styrene-butadiene-styrene) is a more commonly used modifier, and the amount accounts for more than half of the total amount of all modifiers. Since thermoplastic elastomer (SBS) has the two-phase structure characteristics of rubber phase and resin phase, the prepared modified asphalt has good deformation recovery ability, and can improve the high-temperature and low-temperature performance of asphalt at the same time, which is an idea...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this technology is that after the rubber powder is "desulfurized", the network structure of the vulcanized rubber is destroyed, which affects the temperature sensitivity index of the modified asphalt and reduces the high temperature performance of the modified asphalt

However, the disadvantage of this technology is that a large proportion of expensive materials will increase the cost of modified asphalt materials, and it will be difficult to consider practical applications from an economic point of view.

The patented preparation technology process is too complicated, requiring two independent shearing and independent development processes, which is essentially different from the patented continuous preparation technology process

Images