The invention relates to a method for preparing chitosan and chitin functional materials by taking ionic liquids as solvents. In the invention, the ionic liquids or the water solutions of the ionic liquids are adopted for dissolving chitosan and chitin so as to prepare chitosan functional fibers, chitin functional fibers, chitosan/chitin blended fibers, chitosan functional films, chitin functional films, and chitosan/chitin films respectively. Imidazole-category ionic liquid, pyridine-category ionic liquid, pyrrole-category ionic liquid, morpholine-category ionic liquid and thiazole-category ionic liquid or water solutions of the ionic liquids are used as solvents, and the solvent selection of chitosan and chitin are broadened. The method utilizes the ionic liquids to prepare chitosan and chitin functional fibers and films, and the method is high in efficient and environment-friendly; in addition, the prepared functional materials have high mechanical strength and stable chemical properties. The functional materials improve the application of the fibers and the films in the fields of medical, health care and textiles.

Method for preparing chitosan and chitin functional materials by taking ionic liquid as solvent

The invention discloses a method for continuously preparing a cellulose spinning stock solution by using a double-screw extruder together with a film-scraping film evaporator. The method comprises the following steps of: feeding cellulose and a solvent into a cellulose feeding hole and a solvent feeding hole of the double-screw extruder respectively; and dissolving the cellulose, and defoaming to obtain the cellulose spinning stock solution. In the invention, high shearing action provided by the double-screw extruder and the film-scraping evaporator has contribution to relief of macromolecular chain entanglement and flow orientation, so that the rheological property and spinning property of the spinning stock solution are enhanced, and the stretching and macromolecular orientation in the spinning process are facilitated. Due to the adoption of the method, continuous stable preparation of the spinning stock solution is well realized, and industrialization of regenerated cellulose fiber in a solvent system is facilitated.

Method for preparing cellulose spinning stock solution

The invention discloses a preparation method of wood fiber bio-based plastic. The preparation method comprises the steps: firstly, carrying out drying and crushing pretreatment on a wood fiber biomass; then, carrying out ball milling pretreatment; next, mixing the ball milled wood fiber raw material and an ionic liquid/dimethyl sulfoxide or quaternary ammonium salt/dimethyl sulfoxide solution; then, placing the mixture into a kneading machine for kneading; recovering dimethyl sulfoxide in the kneading process, and obtaining the wood fiber bio-based plastic after the kneading is ended. The method is wide in raw material source, low in raw material cost and high in resource utilization ratio; a three-dimensional meshy structure of lignin is damaged through ball milling in advance, so that the attainability of a reagent is greatly increased, and a great number of highly-corrosive reagents and solvents are avoided; the quaternary ammonium salt or ionic liquid can be penetrated among molecular chains of cellulose by means of the powerful shearing force of the kneading machine, little ionic liquid is used, and the wood fiber bio-based plastic can be extruded to be granulated and also be subjected to injection molding; the preparation method is environment-friendly, simple in process and easy to operate.

Preparation method of wood fiber bio-based plastic

The invention provides a high-water-content ionic liquid/cellulose spinning solution preparation method. The preparation method comprises that ionic liquid the water content of which is smaller than or equal to 20% and cellulose the water content of which is smaller than or equal to 20% are put in a reaction vessel and are stirred and mixed to be uniform, the reaction temperature is controlled to be in a range from 60 DEG C to 110 DEG C, water-containing ionic liquid and water-containing cellulose which are mixed uniformly are sent to a film evaporator, under the heating and vacuum condition, water in the mixture is extracted through the film evaporator, the cellulose is completely dissolved in the ionic liquid, and a high-water-content Ionic liquid/cellulose spinning solution is prepared. The high-water-content Ionic liquid/cellulose spinning solution preparation method is advantaged in that the water content demands for the ionic liquid and the cellulose are reduced, and the ionic liquid recovery cost is reduced.

High-water-content ionic liquid/cellulose spinning solution preparation method

Method for extruding in-situ grafting modified cellulose through twin screws with ionic liquid serving as solvent

Method for continuous preparation of polymer solution with ion liquid as solvent

Method for preparing cellulose spin dope

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Method for continuous preparation of polymer solution with ion liquid as solvent

Method for preparing cellulose spin dope