Direct-feeding type waste plastic asphalt modifier and preparation method thereof

Abstract

The invention discloses a direct-feeding type waste plastic asphalt modifier which comprises the following raw materials, by mass: 49-69 parts of LDPE, 30-50 parts of high-fluidity low-density polyethylene, and 1 part of antioxidant. The preparation method comprises the following steps: (1), mixing the LDPE reclaimed material, the high-fluidity low-density polyethylene and the antioxidant in partsby mass at the temperature of below 60 DEG C, and performing stirring to obtain a blended material; and (2), extruding and granulating the blended material until the particle size is less than or equal to 3mm, thereby obtaining the direct-feeding type waste plastic asphalt modifier. The modifier disclosed by the invention can be directly put into an asphalt mixture to participate in mixing of themixture, and is quickly melted in matrix asphalt under the action of high-temperature shearing dispersion of the mixture to achieve micron-scale dispersion, so that a problem of storage stability ofwet-process waste plastic modified asphalt taking LDPE as a main component is solved, and the high-temperature rutting resistance of the asphalt mixture is improved.

Description

technical field

[0001] The invention belongs to the technical field of asphalt modifier preparation, in particular to a direct-throwing waste plastic asphalt modifier and a preparation method thereof. Background technique

[0002] With the wide application of plastics, a large amount of waste plastics are also produced thereupon. The problem of waste plastics disposal and environmental pollution has gradually become the focus of attention. Due to the large output of LDPE-based waste plastics and most of them are packaging sheets, less additives and fillers are added, and the components after recycling and granulation are relatively single. Therefore, it has attracted wide attention in the field of waste plastic recycling. In addition, due to the high degree of branching of LDPE, there are both long-chain branches and short-chain branches inside it, and some long-chain branches are even longer than the main chain, and its long- and short-chain branches are irregular. This ...

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