Preparation method of shape memory polyurethane modified asphalt-based joint compound

Abstract

The invention is a preparation method of a shape-memory polyurethane modified asphalt-based caulking material, which belongs to the technical field of road cement pavement caulking, and solves the problem that the current asphalt-based caulking material lacks shape memory function, is difficult to adapt to joint width expansion and contraction changes, ultraviolet aging, Elastic recovery and poor mechanical properties. In the present invention, first, an appropriate amount of shape memory polyurethane is added to the asphalt-based caulk for modification; then, the effect of the polyurethane on the performance of the asphalt-based caulk is analyzed through microscopic characterization methods such as differential scanning calorimetry and Fourier transform infrared analysis; The road performance test of memory polyurethane modified asphalt-based joint compound was carried out to determine the optimal doping amount of shape memory polyurethane modifier and various admixtures. The shape-memory polyurethane modified asphalt-based caulk prepared by the invention can better adapt to the road performance and use requirements of the cement pavement, reduce the durability problems of the caulk such as cracking, falling off, water seepage, and extrusion, and improve the durability of the caulk. Stress state, prolong the service life of caulk.

Description

technical field [0001] The invention relates to a preparation method of a shape-memory polyurethane modified asphalt-based caulking material, which belongs to the technical field of cement pavement caulking. Background technique [0002] As a pavement form of high-grade pavement structure, cement pavement has developed rapidly in my country because of its advantages of good stability, high strength and good durability. It is one of the most important structures in the existing pavement structure. [0003] Although the cement pavement has many advantages, it also has its fatal shortcomings, one of which is the joint problem. The joint has always been an essential and important part of the cement pavement. It is also one of the weakest and most vulnerable links in the pavement structure. It is prone to diseases such as mud pumping, wrong platform, and broken boards, which will seriously affect the overall cement pavement. Sex and driving comfort, and even affect people's live...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a preparation method of shape-memory polyurethane modified asphalt-based caulk, which adds an appropriate amount of shape-memory polyurethane modifier to the asphalt-based caulk for optimal modification, and solves the problem of current asphalt-based caulk Lack of shape memory function, difficult to adapt to seam width expansion and contraction, ultraviolet aging, elastic recovery and poor mechanical properties, resulting in durability problems such as stretch cracking, falling off, water seepage, extrusion, etc. Sealing waterproof effect and durability of the material, prolonging the service life of the caulk