Abstract
To solve the problem of microcracks caused by CO2 erosion in the cementing ring, an environmental responsive polymer (LJIY) was prepared to repair microcracks. LJIY was synthesized from formaldehyde and urea, and its structure and properties were analyzed by FTIR, SEM, laser particle size analyzer and environmental responsiveness test etc. The results showed that LJIY was microsphere with an average particle size of 5.33 μm. LJIY was responsive to environmental pH, structurally stable in alkaline environments, and crosslinkable in acidic environments. LJIY had obvious repair effect on the microcracks of cement stone. After 28 days of repair in CO2 solution, the compressive strength recovery rate of cement stone mixed with 5% LJIY was 87.2%, the permeability was reduced to 0.001 μm2, and the microcracks were basically healed. The healing mechanism of LJIY on cement microcracks was that when the microcracks in the cement stone were formed, CO2 penetrates into the cement stone, and the pH of the solution environment was reduced to acid. Under acidic conditions, LJIY crosslinked to form a polymer film that adhered or filled the microcracks, thereby healing the microcracks.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
