Organosilicone-nano compound modified polyurea corrosion-resisting coating for mechanical recovery well environment and preparation method for organosilicone-nano compound modified polyurea corrosion-resisting coating

Abstract

The invention discloses an organosilicone-nano compound modified polyurea corrosion-resisting coating for a mechanical recovery well environment. The coating comprises the following components in percentage by volume: 50 percent of component A and 50 percent of component R, wherein the component A is semi-prepolymer which is synthesized by using 30 to 50 parts of polyisocyanates of which functionality degree is 2 to 2.7, 20 to 40 parts of polyol and 10 to 30 parts of organosilane; free isocyanate accounts for 13 to 18 percent of the semi-prepolymer; and the component R comprises the following components in part by weight: 10 to 30 parts of nano powder, 40 to 60 parts of amino-terminated polyether, and 5 to 30 parts of amine chain extender. The invention also discloses a preparation method for the organosilicone-nano compound modified polyurea corrosion-resisting coating for the mechanical recovery well environment. The coating has the advantages that when sprayed on a pretreated sucker rod by the method, the component A and the component R are cured quickly, and are wear-resistant and high temperature-resistant; and by matching of primer, the coating is strong in adhesion and is suitable for the mechanical recovery well environment of which the well depth is less than 2,500m.

Description

technical field [0001] The invention relates to a composite coating, in particular to a novel composite anticorrosion coating which is resistant to high temperature, high pressure and environmental corrosion in mechanical mining wells. Background technique [0002] Corrosion of steel pipes generally exists in various sectors of the national economy and national defense construction, which not only brings huge losses to the national economy, but also causes great difficulties to production and life. According to statistics, the annual output of steel in my country is 160 million tons, and more than 60 million tons are lost due to corrosion every year. Corrosion of steel pipes is not only a waste of steel resources, but also shortens the service life of pipes and equipment, and the cost of replacing new pipes and equipment far exceeds the price of the metal material itself. At the same time, the scale layer formed by corrosion products will reduce the heat transfer efficiency...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of sucker rod corrosion, the present invention provides an organic silicon-nano-composite modified polyurea coating and its preparation method which are resistant to high temperature, high pressure and machine recovery well environment corrosion. This composite coating has good Mechanical properties such as abrasion resistance, elongation, impact resistance, solvent resistance, dimensional stability at high and low temperatures, etc.