Styrene-butadiene rubber modified asphalt mixture and preparation method thereof

Abstract

The invention discloses a styrene-butadiene rubber modified asphalt mixture and a preparation method thereof. Every 100 parts of matrix asphalt comprises the following components in parts by weight: 1) 100 parts of matrix asphalt, 2) 3.0-7.0 parts of butadiene-styrene latex, 3) emulsified asphalt accounting for 1/3-1/4 of the butadiene-styrene latex by mass, and 4) 1.5-3.0 parts of ceryl warm-mixing agent. The preparation method comprises the following steps: proportionally and uniformly mixing the butadiene-styrene latex and emulsified asphalt, heating and stirring the mixed solution, respectively adding the mixed solution and ceryl warm-mixing agent into the matrix asphalt, and carrying out common stirring to prepare the styrene-butadiene rubber modified asphalt. The preparation method does not need any high-shear equipment, and can complete the preparation of the styrene-butadiene rubber modified asphalt only by adopting the common direct-current mixing equipment. The styrene-butadiene rubber modified asphalt mixture has the advantages of favorable high/low-temperature properties and simple production technique, and can be produced and processed only by the heating and common mixing equipment.

Description

technical field [0001] The invention relates to a styrene-butadiene rubber modified asphalt mixture and a preparation method thereof, in particular to a composite modified asphalt mixture containing styrene-butadiene rubber and a wax-based warm-mix modifier and a preparation method thereof. Background technique [0002] Polymer-modified asphalt has excellent road performance and has been widely used in the upper layer and even the middle and lower layers of expressways. Styrene / butadiene / styrene (SBS) copolymer modified asphalt is widely used at present. Compared with SBS-modified asphalt, styrene-butadiene rubber (SBR)-modified asphalt has significantly improved the low-temperature performance of asphalt, and the ductility at 5°C can be increased to more than 150cm, which can effectively prevent low-temperature cracking of asphalt pavement in winter and avoid water damage. The life of the asphalt pavement caused by the damage is greatly shortened, and the maintenance cost ...

AI Technical Summary

Problems solved by technology

The use of SBR modified asphalt is seldom, the main reasons are: first, the modification of asphalt by SBR is basically limited to the low-temperature performance, but there is no obvious improvement in the high-temperature performance of asphalt; second, because SBR is difficult to break and is not easy to dissolve Due to the formation of a stable system of asphalt, it causes problems such as high equipment requirements, complicated processes, and difficulty in large-scale industrial production.

[0003] In order to solve the problems existing in the preparation process of styrene-butadiene rubber, Chinese patent CN200610023104 discloses a method of adding SBR latex. Although it solves the problem of adding SBR latex, it is easy to cause asphalt overflow due to the large amount of water in the emulsion. Accidents, making production difficult to operate

Chinese patent CN01135212 discloses a method of first making SBR into a high-aromatic fraction to make a mother liquor. Although the purpose of compatibility with asphalt is achieved, the swelling time of SBR is long, which increases the production cost and the production cycle.