Hyperbranched structure-containing asphalt pavement joint sealant and preparation method thereof

Abstract

The invention discloses a hyperbranched structure-containing asphalt pavement joint sealant and a preparation method thereof. The joint sealant is prepared from, by weight, 44-52 parts of matrix asphalt, 5-9 parts of a hyperbranched monomer, 10-20 parts of an auxiliary additive, 1-7 parts of a viscosity reducer, 2-10 parts of a composite modifier and 12-18 parts of a filler. The preparation method comprises the following steps: heating the matrix asphalt to 130-150 DEG C, conveying the heated matrix asphalt to a stirring tank, adding the auxiliary additive, stirring the matrix asphalt and the auxiliary additive for 30 min, heating the obtained mixture to 150-170 DEG C, sending the heated mixture to a colloid mill, heating the mixture to 190 DEG C, adding the composite modifier, stirring the mixture and the composite modifier for 1 h, cooling the obtained material to 160-170 DEG C, adding the hyperbranched monomer, stirring the material and the hyperbranched monomer for 1 h, adding the filler and the viscosity reducer, and stirring all above materials for 1 h to obtain the joint sealant. The hyperbranched structure-containing asphalt pavement joint sealant has high elasticity recovery rate and excellent high and low temperature resistance, is suitable for asphalt pavement cracks under different climate conditions; and the preparation method has the advantages of simplicity, simplicity in operation, and suitableness for industrial application.

Description

technical field [0001] The invention relates to a repairing and maintenance material for asphalt pavement crack filling, in particular to an asphalt pavement seam-filling adhesive with a hyperbranched structure and a preparation method thereof. Background technique [0002] As the main form of highway and urban road pavement structure in our country, asphalt pavement has the advantages of mature construction technology, comfortable and safe driving, and convenient maintenance and management. As the most common form of disease in asphalt pavement, cracks have a great impact on the overall quality of the pavement. When cracks appear on the asphalt pavement, if the cracks cannot be repaired in time, rainwater or other sundries will easily enter the structural layer of the asphalt pavement or the roadbed along the cracks, resulting in the decline of the bearing capacity of the asphalt pavement structure and the destruction of the roadbed, thereby speeding up the asphalt pavement...

AI Technical Summary

Problems solved by technology

However, the existing asphalt pavement joint fillers mainly have the following problems: the high and low temperature resistance of the joint sealant is poor. When shrinking, the gap between the caulking agent and the wall of the joint groove is prone to peeling off, and cracks are regenerated, thereby increasing the maintenance cost of the pavement; when the temperature is high in summer, the fluidity of the caulking agent is relatively high, and there will be flowing phenomenon, thereby affecting driving safety

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