Polypropylene PP-DVU and polypropylene homopolymer: durability of geosynthetic and construction materials in high-temperature sulfuric and hydrofluoric acid solutions

Abstract


The study's object was polypropylene PP-DVU and polypropylene homopolymer. These construction materials are used as components of geosynthetic materials and as a part of pipeline systems and the reactor, which are integrated into a newly built industrial complex designed for the processing of columbite concentrate. During service, the studied materials interact with chemically aggressive environments. The specimens were exposed to a liquid solution of hydrofluoric and sulfuric acids at elevated temperatures. Material degradation was assessed through tensile strength tests, mass changes, microhardness, visual appearance, and moisture absorption. The depth of aging and relative elongation were the most indicative criteria for predicting the lifespan of the polymer material. The aging of the material was determined through water absorption tests and mechanical testing. Aging was also visually evident through a noticeable color change. The water absorption of the aged layer was higher compared to the material that had not come into contact with the medium. The aging depth helped determine the diffusion rate of the medium into the material, which aids in recommending the optimal wall thickness for the product. The material's tensile strength remained the same after the tests, thus making this criterion less valuable. A combination of insitu and laboratory tests showed a positive effect by reducing the overall testing time. Criteria for predicting the lifespan of polypropylene materials used in the reactor for columbite concentrate processing were proposed and substantiated

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About the authors

M. A Kovalev

Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russian Federation

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