Polymer modified asphalt and preparation method thereof

Abstract

The invention relates to polymer modified asphalt and a preparation method thereof. The modified asphalt consists of base asphalt, maleic anhydride grafted ethylene-vinyl acetate copolymer (M-EVA), styrene-butadiene rubber (SBR) and a tackifier. The preparation method comprises the following steps: heating the base asphalt to completely smelt; and then, slowly adding the maleic anhydride grafted ethylene-vinyl acetate copolymer (M-EVA) modifying agent into the base asphalt by stirring; and cutting and blending the mixture at high speed to prepared the polymer modified asphalt. When the maleicanhydride grafted ethylene-vinyl acetate copolymer (M-EVA) is used for the modified asphalt, a maleic anhydride group reacts with functional groups in the asphalt, so that the polymer and the asphaltperform crosslink to a certain extent, compatibility of the ethylene-vinyl acetate copolymer (EVA) and the asphalt can be improved, the high and low temperature performance of the asphalt is improved, and the polymer modified asphalt is a perfect material for road.

Description

Polymer modified asphalt and preparation method thereof technical field The invention relates to modified asphalt and its production method, in particular to polymer modified asphalt and its preparation method. Background technique At present, there are three main types of modified asphalt produced in China: one is rubber, including natural rubber (NR), styrene-butadiene rubber (SBR), polybutadiene (CR) and so on. Represented by styrene-butadiene rubber (SBR), it mainly improves the low-temperature performance of asphalt. Generally, the modified asphalt material can be applied in colder regions. The second is thermoplastic rubber, including styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), SBS hydrogenated copolymer (SEPS), etc. Highway polymerization The polymer used in modified asphalt is mostly SBS. SBS modified asphalt has good high and low temperature performance, and is widely used in the middle and upper layers of expressway surfaces, but its price ...

AI Technical Summary

Problems solved by technology

The second is thermoplastic rubber, including styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), SBS hydrogenated copolymer (SEPS), etc. Highway polymerization The polymer used in modified asphalt is mostly SBS. SBS modified asphalt has good high and low temperature performance, and is widely used in the middle and upper layers of expressway surfaces, but its price is high, which limits its application

But its comprehensive properties, such as high resistance, low temperature performance, anti-aging performance, etc. are not ideal.