Vacuum freeze-drying method for chitin fiber or chitosan fiber

Abstract

The invention discloses a vacuum freeze-drying method for chitin fiber or chitosan fiber. The vacuum freeze-drying method includes the pre-freezing step and the freeze-drying step; in the pre-freezing step, the freezing temperature is lower than or equal to -20 DEG C, the freezing time is larger than or equal to 1 h, and moisture contained in the chitin fiber or the chitosan fiber is all condensed into the solid state; and in the freeze-drying step, freeze-drying is conducted in a vacuum freeze-drying machine, the cold trap temperature ranges from -85 DEG C to -50 DEG C, the vacuum degree ranges from 1 pa to 70 pa, the freeze-drying time ranges from 2 h to 8 h, and the chitin fiber or the chitosan fiber is obtained when the moisture content of the chitin fiber or the chitosan fiber ranges from 0 to 14.82%. Compared with the prior art, the vacuum freeze-drying method has the technical characteristics and the beneficial effects that the process is simple and is easy to control, the production process is safe, efficient, good in quality, stable and reliable, and the processing cost is low; and the production process is green and environment-friendly.

Description

technical field [0001] The invention relates to a drying treatment method of chitin fiber or chitosan fiber, in particular to a vacuum freeze-drying method of chitin fiber or chitosan fiber. Background technique [0002] The moisture content and hygroscopicity of textile materials are very important performance indicators that affect the production and processing technology of textiles, as well as the wearability of the final finished product. [0003] Among the natural organic compounds existing on the earth, the largest amount is cellulose, followed by chitin, the former is mainly produced by plants, and the latter is mainly produced by animals. Chitin exists in the cells of lower plant fungi and algae in nature, the shells of crustaceans such as shrimp, crab, and insects, and the cell walls of higher plants. [0004] The animal polymer cellulose chitin extracted from crab and shrimp shells by genetic engineering is an extremely abundant natural resource on the earth. Ch...

AI Technical Summary

Problems solved by technology

However, the ensuing problem is that the organic solvents used are generally volatile, flammable, explosive, and highly toxic. Ventilation equipment must be used to strengthen airtightness and ventilation to reduce the escape and evaporation of organic solvents.

This will further lead to a series of problems such as increased investment in production equipment, increased production costs, and unavoidable environmental pollution.