Cellulose solution and preparation thereof thereof

Abstract

A cellulose solution containing components as follow: cellulose, which is 7.0%-30.0% of weight of cellulose solution, other components of are imidazolium ionic liquid which can dissolve cellulose and organic solvent mutual soluble with the imidazolium ionic liquid, with a weight ratio ranging from 1:9 to 24:1. The aforementioned cellulose solution is prepared by: mixing cellulose pulp with other components, preparing uniform cellulose solution by steps of heating, stirring, kneading, and vacuumizing. The cellulose solution prepared by aforementioned method can reduce hardness in process, relieving abrasion of apparatus, and the prepared solution is high in concentration, stable and hard to degrade. And cost can be reduced, suitable for industrialization.

Description

technical field [0001] The invention relates to a cellulose solution and a preparation method thereof. Background technique [0002] With the prominent problem of environmental pollution and the depletion of oil and other resources, the rational, effective and environmentally friendly utilization of natural resources has become the focus of attention. [0003] Cellulose is one of the most widely distributed and largest reserves of natural resources in nature, and its renewable and degradable properties meet the requirements of contemporary circular economy and green environmental protection. However, in the link from nature to human society, it is not very environmentally friendly and meets the requirements of today's green technology from the very beginning, especially the chemical reaction process and pollution in the production process of paper, viscose fiber and so on. concerns, these gave birth to the birth of solvents that directly dissolve cellulose. Lyocell is prep...

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Problems solved by technology

[0004] Lyocell also has some disadvantages in the production process: 1) The solvent NMMO contains nitrogen-oxygen bonds, which is easy to cause oxidative degradation of cellulose, and at the same time, the solvent is prone to explosion when the heating temperature exceeds 130°C; 2) It is difficult to recover the solvent, and with the shortage of oil, The price of raw materials has risen, and the current solvent price has risen a lot compared to when Lyocell started to be industrialized; 3) High vacuum dehydration is required during the dissolution process, which consumes a lot of energy; 4) High viscosity and high elasticity will appear during the dissolution process, and the production equipment requires high requirements; 5) The concentration that can achieve a uniform solution is limited, and the types of fibers obtained and production costs and efficiency are limited

[0008] The inventor finds through many tests: 1) a high-viscosity and high-elastic state will occur in the pure imidazole type ionic liquid dissolving cellulose process, which causes great difficulties to processing, especially when the concentration exceeds 12%, the usual equipment It is difficult to prepare a uniform solution; 2) using pure imidazole-type ionic liquid to dissolve cellulose, when the dissolution temperature or solution temperature reaches or exceeds 140 ° C, it is easy to cause the degradation of cellulose