Polyurethane flexible foam material for railway curing ballast bed and preparation method thereof

Abstract

The invention relates to a polyurethane flexible foam material for a railway curing ballast bed, and belongs to the technical field of curing ballast bed materials. The polyurethane flexible foam material comprises the following components in parts by mass: 100 parts of a material A and 86-91 parts of a material B, wherein the material A is prepared from the following materials in parts by mass: 100 parts of polyether polyol, 30-40 parts of bio-based polyol, 20-30 parts of a flame retardant, 4-8 parts of a small molecule chain extender, 1.75-2.75 parts of a foaming agent and 0.6-1.2 parts of a catalyst; the material B is prepared from the following materials in parts by mass: 57 to 63 parts of isocyanate and 37 to 43 parts of polyether polyol.

Description

technical field [0001] The invention relates to the technical field of solidified ballast bed materials, in particular to a polyurethane flexible foam material for railway solidified ballast bed and a preparation method thereof. Background technique [0002] The ballast track is a traditional railway track, usually composed of two parallel steel rails, the rails are fixed on the sleepers, and the ballast is paved with small gravel. Ballast and sleepers play the role of increasing the force bearing surface, dispersing the pressure of the train, and helping the rail to bear the weight. The purpose is to prevent the rail from sinking into the soil due to too much pressure. The traditional ballasted track has the characteristics of easy laying and low overall cost, but it is easy to deform, frequent maintenance, and high maintenance cost. In addition, the graded ballast of the existing railways has already deteriorated, which is more obvious under the current conditions of freq...

AI Technical Summary

Problems solved by technology

However, at this stage, my country's polyurethane solidified ballast bed still has problems such as high cost, relatively strict pouring conditions and process requirements, which restrict the further promotion and application of polyurethane solidified ballast bed

[0004] However, in the preparation and use of the existing polyurethane solidified ballast bed, the actual outdoor use environment of the polyurethane solidified ballast bed, the waste caused by the flow of raw materials to the ballast area that does not need to be cemented during pouring construction, and the fatigue resistance during use have not been fully considered. , and there are still deficiencies in energy absorption performance and damping performance of polyurethane rubber

[0005] First of all, polyurethane ballast adhesive and foam materials will encounter changes in high and low temperature, dryness and humidity due to seasonal climate changes, as well as erosion by rainy weather and sunlight ultraviolet rays; secondly, on-site pouring construction will affect state indicators such as cleanliness and moisture content High requirements lead to high overall cost of polyurethane cured track bed, and there are still problems of difficult maintenance for problems such as arches on the foundation

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