Self-repairing reprocessable polyurea material as well as preparation method and application

Abstract

The invention relates to the field of new materials, in particular to a self-repairing reprocessable polyurea material as well as a preparation method and application. The self-repairing reprocessablepolyurea material comprises the following raw materials in parts by weight: 3 to 13 parts of a cross-linking agent, 79 parts of amino-terminated polyetheramine, 8 to 18 parts of diisocyanate, and 1 to 5 parts of a catalyst. The polyurea material is obtained by reacting an amino group with isocyanate, and is a novel heat-responsive dynamic bond under the action of high temperature or the catalyst,so that the material can be self-repaired at 80 DEG C, and the interaction of hydrogen bonds between urea bonds can improve the mechanical strength of the material; and the polyurea material is excellent in mechanical properties, endowed with certain transparency, good in reworking properties, high in self-repairing efficiency, relatively low in repair temperature, simple in preparation technology, and low in relative cost.

Description

Technical field [0001] The invention relates to the field of new materials, in particular to a self-repairing and repeatable polyurea material and its preparation method and application. Background technique [0002] Polyurea is an elastomer substance formed by the reaction of isocyanate component and amino compound component. Divided into pure polyurea and semi-polyurea, their performance is different, the most basic characteristics of polyurea are anti-corrosion, waterproof, wear resistance and so on. Polyurea technology will provide China's future large-scale infrastructure construction, such as chemical protection, pipeline anti-corrosion, marine anti-corrosion, tunnel waterproofing, dam maintenance, bridge protection, foundation reinforcement, roof planting, prop production, fender manufacturing, etc. The most advanced overweight anti-corrosion, waterproof, wear-resistant and decorative materials, and the most convenient and quick construction. [0003] At present, there are...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: In order to solve the problems of poor stability and difficult storage of the existing polyurea, the present invention provides a self-repairing and reprocessable polyurea material and its preparation method and application. It is obtained that under the action of high temperature or catalyst, it is a new type of thermoresponsive dynamic bond, which can make the material self-repair at 80°C, and the hydrogen bond interaction between urea bonds can improve the mechanical strength of the material. The polyurea The material has excellent mechanical properties, certain transparency, good reprocessing performance, high self-repair efficiency, low repair temperature, simple preparation process, and relatively low cost

Images