Bücher von Mahdieh Asgari Bajgirani

The purpose of this book is the correction of polyurethane by Vinyl tri methoxy silane. In this method, polyurethane was synthesized by the pre-polymer method, and polypropylene glycol, hex methylene disocyanate, and di-methyl propionic acid were used in the vicinity of the catalyst for this purpose. Then synthesized polyurethane is dispersed by double-distilled water and finally, vinyl monomers and versatic acid and vinyl acetate and vinyl trimethoxysilane along with polyurethane and with the emulsion polymerization method are converted to one vinyl-urethane hybrid co polymer modified with silane. The necessary tests among its thermal properties and stability were investigated. The obtained results indicate an increase and improvement of said properties.

The corrosion of pipelines' coatings is one of the main problems in oil and gas industries for which a large amount of money is spent each year. Coating is the first defense line in front of a corrosive environment in which pipes have been buried. Good function of coating depends on its adhesiveness rate to the metal surface. Initial adhesiveness and its durability in the contact conditions are among those factors that enhance coating efficiency in long term. The rate of Initial adhesiveness has a high relationship with coating movement and surface wetness by this movement in the course of applying the coating and also with cleanliness and preparedness of pipe surface. Corrosion in oil and gas wells has the electrochemical mechanism, When the system reaches a temperature below the dew point, moisture is converted to liquid and many droplets occurs on the pipe's wall. In the electrochemical reaction, water plays role of the electrolyte. In this book we propose and teach some way to decrease corrosion in oil and gas industries.