The invention discloses a chitosan fiber and a preparation method thereof. The method comprises the following steps: stirring chitosan at low temperature or dissolving the chitosan in a solvent composition containing KOH, urea and water by means of freezing-unfreezing circulation to prepare a high-concentration chitosan solution; filtering the high-concentration chitosan solution, defoaming the filtered high-concentration chitosan solution, and spraying the defoamed high-concentration chitosan solution into a coagulating bath for spinning; and further washing with water, drafting, oiling and drying to obtain the chitosan fiber. The method is simple, and mild and easily controllable in operation condition; and the chitosan solution has good stability, is convenient to store and deliver, has proper viscosity and has excellent spinnability. Components of adopted solvent and coagulating bath can be recycled, and a recycling technology is developed and reliable and is suitable for industrial production. The chitosan fiber has a wide application prospect in textile, bio-medical materials and other fields.

Chitosan fiber and preparation method thereof

Cellulose composite solvent system and application thereof

The invention relates to a preparation method of amorphous cellulose particles. Natural cellulose is dissolved through a cellulose aqueous solvent system, then a prepared cellulose solution is dispersed into dispersions, and then purification and drying are performed, so as to obtain the amorphous cellulose particles. According to the preparation method, the cellulose aqueous solvent system is used, the cellulose is dissolved by using a low-temperature dissolution method, and then a phase separation precipitation method is used for preparing the amorphous cellulose particles. The cellulose particles prepared by using the method are amorphous (i.e. no crystal structural characteristics of cellulose I and cellulose II), have the advantages of low crystallinity, controllability in particle size, uniformity in distribution, stability in dispersion in an aqueous phase, no pollution of organic solvents or other heavy metals and low energy consumption and have wide application prospects in the fields of medicine, food, chemical engineering and the like.

Method for preparing amorphous cellulose particles in aqueous solvent system

The invention discloses a method for preparing a cellulose solution.According to the basic technical principle of the method, the wetting property of a solvent on natural cellulose crystals is improved with the amphipathicity of the cellulose solvent so that dissolution of cellulose can be promoted.Based on the principle, the invention provides a room-temperature mild dissolution technical method for cellulose.The method has the advantages that the technology is simple, room-temperature dissolution is achieved, and the method is environmentally friendly and not sensitive to the moisture content of a system.The cellulose solvent is prepared from, by weight, 5-70% of organic base, 2-90% of an assistant and 1-65% of water.Cellulose and the cellulose solvent are blended to form a blend, stirring is carried out until complete dissolution, and the target cellulose solution is obtained.The cellulose solution prepared with the method is used for manufacturing regenerated cellulose membranes or regenerated cellulose fibers or cellulose-base composites.

Method for preparing cellulose solution

The invention relates to coagulating bath for cellulose solution spinning forming and a method for preparing cellulose fibers by the coagulating bath. The coagulating bath, which is particularly used for cellulose solution spinning forming on the basis of alkali/urea/water system solvent methods, can be of used in one stage or multiple stages; the coagulating bath used in each stage is aqueous solution containing phosphoric acid and/phosphate. The coagulating bath is economic, environmentally friendly and recoverable; the cellulose fibers prepared by the coagulating bath are thorough in coagulation without doubling, and are soft and glossy, the fiber interfaces of the cellulose fibers prepared by the coagulating bath are circular and have smooth surfaces, and the intensity of the cellulose fibers is higher than 2.7cN/dtex; the used coagulating bath solution can be used as liquid phosphate fertilizer or recovered and prepared into solid phosphate fertilizer; the coagulating bath is suitable to popularize and apply in scale for industrialized production.

Coagulating bath for cellulose solution spinning forming and method for preparing fibers by coagulating bath

The invention relates to a method for dissolving cellulose, comprising the following steps of: under the condition with the temperature being 0-25 DEG C, firstly mixing the cellulose and a solvent with the weight accounting for 30-70wt% of the total weight of the solvent for dissolving the cellulose uniformly by kneading and shearing; then adding the remaining solvent for dissolving the celluloseat the temperature of 15 below zero to 5 DEG C; and putting the mixture at the temperature of 8 below zero to 25 DEG C, kneading, shearing, mixing uniformly and obtaining cellulose solution The solvent is water solution containing alkali, urea/thiourea and polyethylene glycol The method can prevent colloidal particles, micelles and white cores from forming when the cellulose is dissolved, thus leading the cellulose to be well dissolved and obtaining uniform solution; and after the cellulose solution is defoamed, spinning solution is treated by secondary coagulating bath with the coagulatingliquid being salt solution to obtain the cellulose fiber, the recovery and utilization cost of the solvent and a coagulating agent is reduced greatly, the rapid coagulation is avoided, the drawing and orientation degree is improved and the regenerated cellulose fiber with better strength is prepared

Method for dissolving cellulose and method for preparing regenerated fiber

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Method for dissolving cellulose and method for preparing regenerated fiber