Normal temperature two-component liquid crack pouring sealant for pavements and preparation method thereof

Abstract

The invention provides a normal temperature two-component liquid crack pouring adhesive, which is a polyurethane two-component A-B type liquid crack pouring sealant. Specifically, the component A is aprepolymer prepared by chemical synthesis of a variety of materials including methylenediphenyl diisocyanate (MDI), polyether polyol, chlorinated paraffin, dioctyl phthalate, etc; the component B isa mixture of asphalt, polyether polyol, chlorinated paraffin, polyisobutylene, a crosslinking agent, a coupling agent, a catalyst, a drier, light calcium powder and other materials. During use, the component A and component B are fully mixed in certain proportion and then directly poured into pavement cracks, thus obtaining the pavement crack pouring and sealing material with the advantages of high cohesive force, high adhesion, high wear resistance, high weatherability and rapid curing. And the two-component liquid crack pouring sealant can be used for various cracks on asphalt and cement pavements.

Description

technical field [0001] The invention belongs to the technical field of highway engineering, and in particular relates to a two-component liquid joint glue for normal-temperature pavement and a preparation method thereof. Background technique [0002] Cracks are one of the most common and most prone early diseases of pavement. Although the initial cracks basically have no effect on the service performance, the cracks destroy the integrity and continuity of the pavement structure and lead to a weakening of the structural strength to a certain extent. Make the base layer soft, and under the action of traffic load, it will lead to increased damage to the road surface, forming cracks and even slurry, which will greatly reduce the service life of the road. Therefore, early prevention and treatment of pavement cracks must be strengthened. [0003] At present, the joint filling materials used in pavement crack repair mainly include hot asphalt, emulsified asphalt, normal temperatu...

AI Technical Summary

Problems solved by technology

Among them, ordinary petroleum asphalt is difficult to meet the requirements of road surface filling in terms of high temperature stability, resistance to hard object embedding, and low temperature performance; and modified asphalt, which is usually used as a cement, is insufficient due to its resistance to hard object embedding and low temperature performance. It is generally considered to be suitable for middle and low-grade roads with low winter temperature, small crack expansion and displacement, and small traffic volume; while emulsified asphalt has poor bonding performance, low initial strength, and slow open traffic, so it is more used. It is suitable for filling joints with no or small displacement cracks; the special joint filling adhesive for pavement has the properties of strong adhesion to the joint wall, no flow at high temperature, no brittle cracking at low temperature, and the price is moderate. However, due to the heating required for construction, the road surface needs to be grooved , strong smell, unfriendly to the environment, poor aging resistance and wear resistance, some areas have begun to restrict the use

The normal temperature type sealant has excellent comprehensive performance, but the curing rate is slow, the sealing traffic time is long, and basically all of them are imported products from abroad, which are expensive

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