Views: 1006 Author: Site Editor Publish Time: 2022-01-15 Origin: Site
1. Alkali resistance
The weak basic alkali agent basically did not cause damage to the acetate fiber, and the fiber weight loss rate was very small. After encountering strong alkali, especially diacetate fiber, it is prone to deacetylation, resulting in weight loss, strength and modulus decrease. Therefore, the pH value of the solution for treating cellulose acetate should not exceed 7.0. It is highly resistant to chlorine bleach under standard washing conditions and can also be dry cleaned with perchloroethylene.
2. Resistance to organic solvents
Cellulose acetate is completely soluble in acetone, DMF, and glacial acetic acid, but insoluble in ethanol and tetrachloroethylene. According to these characteristics, acetone can be used as a spinning solvent for acetate fibers, and tetrachloroethylene can be used to dry-clean acetate fabrics.
3. Acid resistance
Acetate fiber has good acid resistance and stability. Common sulfuric acid, hydrochloric acid and nitric acid will not affect the strength, luster and elongation of 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 glucose ring of cellulose are replaced by acetyl groups to form esters. Therefore, the dyes commonly used for cellulose fiber dyeing have almost no affinity for acetate fibers. , difficult to dye. The most suitable dyes for acetate fibers are disperse dyes with low molecular weight and similar dye uptake rates.
Acetate fibers or fabrics dyed with disperse dyes have bright and bright colors, good leveling effect, high dye exhaustion rate, high color fastness, and complete chromatogram.