Acetate fiber, referred to as CA.
Acetate fiber is divided into diacetate fiber and triacetate fiber, which is a kind of man-made fiber. Using cellulose as a raw material, it is converted into a chemical fiber made of cellulose acetate through a chemical process.
The function of acetate fiber
1. Alkali resistance
The weak alkaline alkali agent basically did not cause damage to the acetate fiber, and the fiber weight loss rate was very small. After encountering strong alkalis, especially cellulose diacetate, it is prone to deacetylation, causing weight loss, and the strength and modulus also decrease.
Therefore, the pH value of the solution for treating cellulose acetate should not exceed 7.0. Under standard washing conditions, it has strong resistance to chlorine bleaching, and can also be used for dry cleaning with tetrachloroethylene.
2. Resistance to organic solvents
Cellulose acetate is completely dissolved in acetone, DMF, and glacial acetic acid, but insoluble in ethanol and perchloroethylene.
According to these characteristics, acetone can be used as the spinning solvent of acetate fiber, and tetrachloroethylene can be used for dry cleaning of acetate fabric.
3. Acid resistance
Acetate fiber has good acid resistance and stability. The common sulfuric acid, hydrochloric acid, and nitric acid will not affect the strength, gloss and elongation of the fiber within a certain concentration range; but it can be dissolved in concentrated sulfuric acid, concentrated hydrochloric acid, and concentrated nitric acid.
Although cellulose acetate is derived from cellulose, during the esterification process, a large part of the polar hydroxyl groups on the cellulose glucose ring are replaced by acetyl groups to form esters; therefore, the dyes commonly used in dyeing cellulose fibers have almost no affinity for cellulose acetate , It is difficult to get dyed. The most suitable dyes for acetate fibers are disperse dyes with low molecular weight and similar dyeing rate.
Acetate fiber or fabric dyed with disperse dyes has bright color, good leveling effect, high dye exhaustion rate, high color fastness, and complete color spectrum.