A kind of SBR styrene-butadiene latex for modified emulsified asphalt and preparation method thereof

Abstract

The invention discloses SBR styrene-butadiene latex for modifying emulsified asphalt and a preparation method thereof, belonging to the technical field of asphalt modification. It is characterized in that the composition of raw materials by weight is: 100 parts of cross-linked grafted styrene-butadiene rubber emulsion with a solid content of 40%~60%, 2~6 parts of nonionic emulsifier, 3~6 parts of cationic emulsifier, system pH regulator 0.5~1.5 parts; The preparation steps are: Concentrate cross-linked grafted styrene-butadiene latex and stop when the latex concentration reaches 40%~60%; add nonionic emulsifier, stir for 10 min~15min; add cationic emulsifier according to the ratio of raw materials , stir for 10 min~15min; add system pH regulator according to the ratio of raw materials, and adjust the pH to 2~5. The SBR styrene-butadiene latex of the invention is easy to use, has high stability after being mixed with emulsified asphalt, and can significantly improve the high-temperature resistance performance, viscosity toughness, toughness and anti-aging performance of the asphalt.

Description

technical field [0001] The invention discloses SBR styrene-butadiene latex for modifying emulsified asphalt and a preparation method thereof, belonging to the technical field of asphalt modification. Background technique [0002] Modified emulsified asphalt can be used in construction by spraying, pouring and mixing and paving. It is widely used in asphalt pavement adhesive layer oil and penetrating layer oil, slurry seal layer, micro-surfacing and structural pavement in highway engineering. Base and top coats. When the modified emulsified asphalt is used to pave the road, it can be constructed at room temperature without heating the asphalt and mineral materials, which not only simplifies the operation process, but also saves energy. At the same time, it plays an important role in the timely maintenance and repair of the damaged asphalt pavement. [0003] SBR styrene-butadiene latex modified emulsified asphalt is divided into anionic, cationic and non-ionic, among which th...

AI Technical Summary

Problems solved by technology

Although ordinary low-temperature latex-modified emulsified asphalt has higher softening point, viscous toughness, and toughness than high-temperature latex-modified emulsified asphalt, within a certain range of addition, the softening point of ordinary low-temperature styrene-butadiene latex-modified emulsified asphalt is still It is difficult to achieve the softening point ≥ 53°C required by the Ministry of Communications JTG F40-2004 "Technical Specifications for Construction of Highway Asphalt Pavement"

In order to prepare high-performance modified emulsified asphalt, most of them use SBS modified asphalt for emulsification, and then add styrene-butadiene latex for compound modification to produce modified emulsified asphalt. This method has a good modification effect, but the emulsified modified asphalt is harmful to equipment. , technology, and material requirements are relatively high, and the stability of the emulsified SBS modified asphalt prepared is relatively low

[0005] Chinese patent CN201610273186.7 discloses a method, which uses butadiene, styrene, glycidyl methacrylate, and silane coupling agent as raw materials to obtain latex by high-temperature (50°C~55°C) emulsion polymerization. Agglomeration, ion conversion, and centrifugal concentration are used to produce high-content styrene-butadiene latex, and then the latex is compounded with a 40% aqueous solution of silane coupling agent for emulsified asphalt modification; The mechanical properties are low, and the high-temperature performance margin of the modified emulsified asphalt is not large. The silane coupling agent is hydrolyzed too quickly under acidic conditions, and silane gel has been formed, resulting in uneven dispersion and affecting performance.