Copper ammonia fiber is also a regenerated cellulose fiber. It is to dissolve natural cellulose raw materials such as cotton linter in concentrated ammonia solution of copper hydroxide or alkaline copper salt, prepare spinning solution, spin in coagulation bath of water or dilute alkaline solution, and then decompose molecular chemicals of cuprammonium cellulose to regenerate cellulose in two baths containing 2%~3% sulfuric acid solution. The generated hydrated cellulose is processed to obtain cuprammonia fiber.
1. Morphological structure
The cross section of cuprammonia fiber is circular, without skin core structure. The fiber can withstand high tension, and the monofilament produced is thin, generally below 1.33tx, up to 044tex. So it is made of copper ammonia fiber Backpack webbing Soft hand feel, soft luster and silk feeling.
2. Moisture absorption and dyeing
The moisture absorption of cuprammonia fiber is similar to that of viscose fiber, and the moisture regain can also reach 12% - 13% under general atmospheric conditions. Under the same dyeing conditions, the dyeing affinity of cuprammonia fiber is greater than that of viscose fiber, and the color is darker.
3. Mechanical properties
The dry strength of cuprammonia fiber is similar to that of viscose fiber, but the wet strength is higher than that of viscose fiber. Wear resistance is also better than viscose fiber.
4. Chemical stability
Concentrated sulfuric acid and hot dilute acid can dissolve cuprammonia fiber, dilute alkali can slightly damage it, and strong alkali can expand cuprammonia fiber until it is dissolved. Copper ammonia fiber is insoluble in general organic solvent, but soluble in copper ammonia solution. Because the cuprammonia fiber is thin and soft, and the luster is appropriate, the backpack ribbon is usually made of silk or knitted fabric. However, due to the limitation of raw materials, the process is complex and the output is low.
