نوع مقاله : تالیفی
نویسندگان
1 گروه علوم و مهندسی کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
2 گروه علوم و مهندسی کاغذ، دانشکده مهندسی چوب و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Lignin is a natural, non-toxic, and aromatic polymer rich in various functional groups that is obtained from wood and stems of lignocellulosic trees and plants. Currently, the pulp industry produces a large amount of industrial lignin annually, which is usually burned only for energy recovery without creating appropriate added value. One of the ways
to create value for lignin is to use it in the production of polyurethanes. Polyurethanes (PUs) have wide applications and are one of the most important materials currently obtained from petroleum and fossil sources. For this reason, researchers and industries have paid attention to lignin-based polyurethanes as a sustainable alternative to petroleum-based polyurethanes in the development of polymer materials. In this article, some types of industrial lignins are being produced in pulping processes, the main methods of producing liquid polyol from solid lignin for the production of bio-based polyurethanes, the difference between lignin-based and petroleum-based polyurethane, and technology evaluation are examined. Polyurethanes produced from biological polyols such as lignin contribute to the economic
cycle. The use of common isocyanates (synthesized with highly toxic phosgene gas) in the production of polyurethane is considered an important environmental problem. Also, the production of non-isocyanate polyurethanes (NIPU) based on lignin is discussed.
کلیدواژهها [English]