Low-temperature-resistant tackifying and toughening asphalt modifier preparation method

Abstract

The invention discloses a low-temperature-resistant tackifying and toughening asphalt modifier preparation method, which comprises: preparing a fluorosilicone acrylic acid copolymerization emulsion; preparing an ethylene-vinyl acetate (EVA) emulsion; preparing a styrene-butadiene-styrene thermoplastic elastomer water latex; adding the styrene-butadiene-styrene thermoplastic elastomer water latex,a dispersant, the ethylene-vinyl acetate (EVA) emulsion and a stabilizer to the fluorosilicone acrylic acid copolymerization emulsion, and compounding; adding the low-temperature-resistant tackifyingand toughening asphalt modifier to an emulsified asphalt soap liquid; mixing the hot asphalt and an odorless sulfur-containing cross-linking agent according to a certain mass ratio; and adding the obtained mixture to an emulsifier to finally obtain the high-viscosity and high-toughness modifier. According to the present invention, more than three polymer emulsions are compounded under the actionsof the stabilizer and the dispersant to obtain the efficient and stable polymer emulsion so as to form the stable modified emulsified asphalt, such that the adhesion and bonding performance of the asphalt is significantly improved, and the low-temperature resistance of the asphalt is improved.

Description

technical field [0001] The invention specifically relates to a preparation method of an anti-low temperature thickening and toughening asphalt modifier. Background technique [0002] The emulsification process of modified emulsified asphalt is complicated. The complex polymer and asphalt in the soap liquid usually form an emulsion with a short stable period by physical adsorption. After a certain period of time, due to the difference in physical and chemical properties such as material density and surface tension, it is easy to Physical delamination occurs, resulting in "heterogeneity" of the composite polymer-modified asphalt. In polymer-modified bitumen, crosslinking agents are usually added to solve this problem. However, in emulsified asphalt, this research has not been reported. [0003] The preparation of modified emulsified asphalt is mainly to modify and emulsify asphalt. According to the sequence of modification and emulsification, it can be divided into emulsific...

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Problems solved by technology

[0009] The emulsification of modified asphalt has the following technical problems: when modifying asphalt, it is necessary to use equipment with strong shear force, but when the shear force is too strong, the shear effect will destroy the formed network structure, The modification effect is reduced; modified asphalt is extremely difficult to emulsify, and an emulsifier with excellent performance is required to emulsify: the temperature difference between modified asphalt and soap liquid is large during emulsification, and boiling is prone to occur, making emulsification difficult; the finished product after emulsification has a higher temperature , it is easy to cause the newly produced emulsion to break; the density of the modified asphalt is high, the particle size of the emulsified asphalt is large, and the storage stability is poor

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