Asphalt mixture modifier particles and preparation method thereof

Abstract

The invention discloses asphalt mixture modifier particles and a preparation method thereof. The preparation method includes the steps that a raw material SBS and a scorch retarder are mixed to be uniform at normal temperature, and a first mixture is prepared; then heating melting treatment is carried out; a cross-linking agent and an accelerant are added at the later stage of heating melting treatment, and a second mixture is prepared; then extrusion treatment is carried out to obtain strip-shaped materials; the strip-shaped materials are chopped, and the asphalt mixture modifier particles are obtained. The asphalt mixture modifier particles are prepared from, by weight, 90-97 parts of SBS, 0.3-3 parts of scorch retarder, 0.4-5 parts of cross-linking agent and 1-5 parts of accelerant. According to the granulation process, SBS and the cross-linking agent are not cross-linked at the granulation process stage, when SBS and the cross-linking agent are added into an asphalt mixture, under the effect of shear dispersion of high-temperature stone, a cross-linking reaction is generated while swelling dispersion is carried out, a net-shaped structure is formed, asphalt is evenly wrapped by the net-shaped structure, and the high-low-temperature performance, the aging resistance, mechanical performance and the like of an SBS modified asphalt concrete system can be improved.

Description

Technical field [0001] The invention relates to an asphalt mixture modifier particle and a preparation method thereof, in particular to an asphalt mixture modifier particle which is not crosslinked by SBS and a crosslinking agent and a preparation method thereof, and belongs to the road asphalt mixture modifier field. Background technique [0002] SBS modifier is a kind of thermoplastic elastomer, which uses butadiene and 1,3-styrene as monomers and is a linear or star block copolymer prepared by anionic polymerization. Because ordinary SBS modifiers have high melting points and are not easy to dissolve and disperse, colloidal milling or high-speed shearing methods are often used to prepare SBS modified asphalt in advance. Nevertheless, due to the difference in molecular structure, composition and properties, the SBS and asphalt are thermodynamically incompatible. SBS modified asphalt is actually physically blended and cannot form a homogeneous system. During long-term storage, ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of granulation process that SBS and cross-linking agent do not cross-link for the technical problem of existing SBS modified asphalt technology, the present invention makes SBS and Modifier granules with no cross-linking agent, which solves the problem of difficult granulation caused by premature cross-linking of SBS and cross-linking agent in the existing modifier granulation technology. The modifier granules prepared by the present invention It subverts the previous pre-mixing process, can be directly thrown into the asphalt mixture, and can shorten the crosslinking reaction time of SBS modified asphalt, easy to use, and the performance of the prepared SBS modified asphalt mixture is good

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