Rapidly cured rigid polyurea with high adhesion and preparation method of rapidly cured rigid polyurea

Abstract

The invention belongs to a rigid spray polyurea protective material for steel structure anticorrosion and discloses rapidly cured rigid polyurea with high adhesion. The rapidly cured polyurea comprises double components, wherein the component A comprises raw materials in percentage by mass as follows: 50%-70% of isocyanate, 30%-40% of polyether polyol and 6%-10% of auxiliaries; the component B comprises raw materials in percentage by mass as follows: 20%-40% of a chain extender, 30%-60% of polyether polyol, 0-0.5% of a catalyst, 0-1% of color paste, 0-10% of pigments and filler and 0-10% of auxiliaries. The rigid polyurea improves the defects of cracks and high brittleness of a polyurea coating with high NCO content, has higher impact resistance and belongs to rapidly cured and quick-drying type polyurea materials, the construction period can be shortened, and the construction efficiency can be improved effectively. The crosslinking density and the rigidity of polyurea are improved, the adhesion of polyurea on a steel stature reaches 15 MPa, the cathodic disbanding diameter is smaller than 3 mm, the polyurea is applicable to various working condition environments due to high performance, and the application field is broadened.

Description

technical field [0001] The invention belongs to the anti-corrosion rigid spray polyurea protective material for steel structure, and relates to the rigid polyurea material. Background technique [0002] In petroleum, chemical industry, pipeline, ocean engineering and other anti-corrosion fields, most equipment, pipelines and platforms are in contact with chemical media, atmosphere, sea water, soil and other corrosive media to cause chemical or electrochemical damage. The concentration of corrosive medium and the ambient temperature are erratic, so steel structure equipment, pipelines, platforms, etc. will be corroded to varying degrees. Separate materials from corrosive media, such as non-metallic coatings, linings, temporary protective materials, etc., to prevent wear and corrosion of equipment and prolong service life. [0003] Traditional non-metallic coatings such as epoxy, polyurethane, chlorinated rubber, engineering plastics, and polyolefin compounds have good protec...

AI Technical Summary

Problems solved by technology

However, its adhesion is uneven and its cost is high, so it is not widely used in some fields

The gel time of polyurea used in steel structures is as long as 20s, the adhesion is only 10MPa, and the cathodic disbondment radius is only 10mm. It is difficult to adapt to the increasingly complex working environment. Urea