Solvent composite and preparation method and use thereof

Abstract

The solvent composition consists of sodium hydroxide 5-12 wt% and urea 8-20 wt% except water. The preparation process of the solvent composition is also provided. Water solution of sodium hydroxideand water solution of urea are mixed to compound the solvent composition; or sodium hydroxide is first compounded into water solution and urea is then added to compound the solvent composition. The solvent composition may be used in directly dissolving natural cellulose and regenerated cellulose to obtain transparent cellulose solution with high dissolubility and high concentration.

Description

technical field

[0001] The present invention relates to a solvent composition and its preparation method and use. Background technique

[0002] Due to the increasing environmental pollution caused by non-degradable plastic waste and the gradual depletion of petroleum resources in 50 years, the research and development of renewable resources has become increasingly attractive. Plant cellulose is the most abundant renewable organic resource on earth, and it is an environmentally friendly polymer material. Cellulose has attracted more and more attention due to its outstanding regeneration rate (100 billion tons / year), and is expected to become a functional material in the 21st century. However, in the chemical industry, cellulose is far from being fully utilized, mainly because the cellulose dissolution process in the existing technology is complicated, costly and polluting (J.Macromol.Sci.-Rev.Macromol.Chem., 1980, C18 (1), 1). At present, more than 90% of cellulose product...