Development of a polyurea-based composition with an extended life span
Objectives. Improvement of the technology for obtaining polymer-sprayed coatings based on polycarbodiimides (polyureas) with high chemical, hydrolytic, and abrasive resistance and improved physical and mechanical properties, as well as obtainment of polyurea compositions with a lifetime of at least...
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| Format: | Article |
| Language: | Russian |
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MIREA - Russian Technological University
2021-05-01
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| Series: | Тонкие химические технологии |
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| Online Access: | https://www.finechem-mirea.ru/jour/article/view/1701 |
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| author | S. I. Romanov O. A. Botvinova E. A. Timakov L. A. Chizhova Yu. T. Panov |
| author_facet | S. I. Romanov O. A. Botvinova E. A. Timakov L. A. Chizhova Yu. T. Panov |
| author_sort | S. I. Romanov |
| collection | DOAJ |
| description | Objectives. Improvement of the technology for obtaining polymer-sprayed coatings based on polycarbodiimides (polyureas) with high chemical, hydrolytic, and abrasive resistance and improved physical and mechanical properties, as well as obtainment of polyurea compositions with a lifetime of at least 5 min without loss performance characteristics (i.e., “hand-applied” polyureas) suitable for repair of coatings already in use.Methods. The reaction rate between isocyanate and amino groups is almost a hundred times higher than that between isocyanate and hydroxyl groups, necessitating the use of special highperformance and high-pressure installations equipped with self-cleaning mixing chambers and heating of components. The following are determined from the obtained materials: strength, elongation at break according to the standard method, Taber abrasion, and Shore hardness.Results. Three methods of slowing down the reaction are investigated: 1) the synthesis of prepolymers with the content of NCO groups from 10.5% to 18%; 2) the addition of a plasticizer into the prepolymer in the amount of 1–10 mass parts; and 3) the introduction of polyesters into the composition and radiation of the so-called “hybrid” systems. When using 14% polyesters with a molecular weight of 2000 Da, only “hybrid” systems make it possible to obtain compositions with a lifetime of more than 5 min. At the same time, the tensile strength decreases by 20%, and the abrasion increases by 40%; however, such “hybrid” systems have a higher adhesion force and are cheaper than pure polyureas, allowing them to be used as “repair” systems.Conclusions. The developed composition and technology of applying “hybrid” systems allow for the repair of existing coatings without using specialized devices. “Manual” polyurea is easy to use and does not require special training. |
| format | Article |
| id | doaj-art-64413297675f424cb542e6ccaf693369 |
| institution | Kabale University |
| issn | 2410-6593 2686-7575 |
| language | Russian |
| publishDate | 2021-05-01 |
| publisher | MIREA - Russian Technological University |
| record_format | Article |
| series | Тонкие химические технологии |
| spelling | doaj-art-64413297675f424cb542e6ccaf6933692025-08-20T03:56:32ZrusMIREA - Russian Technological UniversityТонкие химические технологии2410-65932686-75752021-05-0116217618310.32362/2410-6593-2021-16-2-176-1831634Development of a polyurea-based composition with an extended life spanS. I. Romanov0O. A. Botvinova1E. A. Timakov2L. A. Chizhova3Yu. T. Panov4Production Company Elast PUProduction Company Elast PUAlexander and Nikolay Stoletovs Vladimir State UniversityAlexander and Nikolay Stoletovs Vladimir State UniversityAlexander and Nikolay Stoletovs Vladimir State UniversityObjectives. Improvement of the technology for obtaining polymer-sprayed coatings based on polycarbodiimides (polyureas) with high chemical, hydrolytic, and abrasive resistance and improved physical and mechanical properties, as well as obtainment of polyurea compositions with a lifetime of at least 5 min without loss performance characteristics (i.e., “hand-applied” polyureas) suitable for repair of coatings already in use.Methods. The reaction rate between isocyanate and amino groups is almost a hundred times higher than that between isocyanate and hydroxyl groups, necessitating the use of special highperformance and high-pressure installations equipped with self-cleaning mixing chambers and heating of components. The following are determined from the obtained materials: strength, elongation at break according to the standard method, Taber abrasion, and Shore hardness.Results. Three methods of slowing down the reaction are investigated: 1) the synthesis of prepolymers with the content of NCO groups from 10.5% to 18%; 2) the addition of a plasticizer into the prepolymer in the amount of 1–10 mass parts; and 3) the introduction of polyesters into the composition and radiation of the so-called “hybrid” systems. When using 14% polyesters with a molecular weight of 2000 Da, only “hybrid” systems make it possible to obtain compositions with a lifetime of more than 5 min. At the same time, the tensile strength decreases by 20%, and the abrasion increases by 40%; however, such “hybrid” systems have a higher adhesion force and are cheaper than pure polyureas, allowing them to be used as “repair” systems.Conclusions. The developed composition and technology of applying “hybrid” systems allow for the repair of existing coatings without using specialized devices. “Manual” polyurea is easy to use and does not require special training.https://www.finechem-mirea.ru/jour/article/view/1701polyurealifetimepolymer coatingsphysical and mechanical properties |
| spellingShingle | S. I. Romanov O. A. Botvinova E. A. Timakov L. A. Chizhova Yu. T. Panov Development of a polyurea-based composition with an extended life span Тонкие химические технологии polyurea lifetime polymer coatings physical and mechanical properties |
| title | Development of a polyurea-based composition with an extended life span |
| title_full | Development of a polyurea-based composition with an extended life span |
| title_fullStr | Development of a polyurea-based composition with an extended life span |
| title_full_unstemmed | Development of a polyurea-based composition with an extended life span |
| title_short | Development of a polyurea-based composition with an extended life span |
| title_sort | development of a polyurea based composition with an extended life span |
| topic | polyurea lifetime polymer coatings physical and mechanical properties |
| url | https://www.finechem-mirea.ru/jour/article/view/1701 |
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