Method for recycling waste glassine

Abstract

The invention discloses a method for recycling waste glassine. The method comprises the following steps: firstly, respectively drying the waste glassine and solvent LiCl, then immersing the waste glassine into a solution comprising activating agent KMnO4 and solvent DMAc to heat and activate, adding the activated waste glassine into a prepared solvent system DMAc / LiCl to mix according to the compounding ratio, and standing the mixture at the room temperature for more than 15 hours to obtain a waste glassine solution after the activated waste glassine is heated and agitated to dissolve for three or more hours at the temperature equal to or more than 88 DEG C, and preparing the glassine or recovered fiber finally by the obtained waste glassine solution according to the subsequent conventional glassine or recovered fiber manufacturing process. In the invention, the LiCl / DMAc mixed solvent is utilized to dissolve the waste glassine, thus the good dissolving effect is obtained, the preparedglassine solution system is uniform and steady, the rheological performance is good, the production requirements on spinning and film manufacturing can be met, and the prepared recovered film and therecovered fiber both have good mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of recycling waste cellophane, in particular to a method for recycling waste cellophane. Background technique [0002] Cellophane is a kind of regenerated cellulose film with dense structure produced by viscose method, which uses natural fibers such as cotton pulp and wood pulp as raw materials. It has non-toxic, tasteless and antistatic properties, and is widely used in the fields of medicine and hygiene. . [0003] The annual output of cellophane in the world is about 3 million tons, of which China accounts for half. Not only that, the manufacturers of cellophane in my country are still increasing year by year. Cellophane will produce a lot of trimming waste in the production process. For a cellophane company with an annual output of 6,000 tons, it produces more than 1 ton of cellophane waste per day. Then for an annual output of 3 million tons, the trimming waste is It will produce 18,300 tons, which is...

AI Technical Summary

Problems solved by technology

Compared with the above four dissolution methods, the viscose method is the most mature process. At present, most enterprises use this method to dissolve cellulose, but the process is complicated and the process is long. Chemical substances such as carbon disulfide and carbon disulfide make it difficult to treat a large amount of waste water and waste gas, and bring pollution to the production environment and the surrounding living environment; N-methylmorpholine-N-oxide solvent system is considered to be the most promising because of its green environmental protection cellulose solvent (Zhang Lina, progress in cellulose solvent research, Acta Polymer Sinica, 2007, (10): 937-944), but the solvent is difficult to synthesize and expensive, with many reaction by-products and harsh reaction conditions, it is difficult to realize large-scale Industrial production; although the ionic liquid system can effectively dissolve cellulose and has molecular designability for cellulose, the solvency of the system in the dissolution process is not very good, the production cycle is long and the synthesis is difficult, and the production process will Pollution to the environment, and has biological toxicity (Liu Baoyou, He Wenjie, Chen Jin, Research Progress in Biotoxicity of Ionic Liquids and Design of Biodegradable Ionic Liquids, Hebei Industrial Science and Technology, 2008, 25(2): 112~115); Chinese Patent CN101037479 discloses a solvent system using alkali / urea or thiourea / water system as cellulose. Although the solvent system can dissolve waste cellophane, it has a poor dissolving effect on waste cellophane and requires strict temperature control

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