Acetate fiber is a semi synthetic fiber material that is formed by the reaction between cellulose and acetic anhydride to produce cellulose acetate, which is spun. It is pided into two types according to the degree of acetate esterification: diacetate and triacetate. Diacetate fibers have a low degree of esterification and can be dissolved in acetone. Triacetate fibers have a high degree of esterification and are insoluble in acetone, but can be soluble in chloroform or dichloromethane. Unlike viscose fibers, in acetate fibers, most or all of the hydroxyl groups on the cellulose ring are acetylated. The longitudinal direction of acetate fiber is a smooth cylindrical shape with stripes, and the transverse direction is elliptical. Due to its low crystallinity and side order, the breaking strength of acetate fibers is poor, even worse in the wet state, but the elongation at break is high, and the elastic recovery is significantly stronger than that of viscose fibers. The moisture absorption of acetate fiber is 6%~7% under standard conditions, and its expansion in water is relatively low. The finished product is easy to wash, and even when washed with hot water, it hardly shrinks. Acetate fiber has good sun resistance, surpassing nylon, viscose fiber, and cotton fiber. When heated, it first softens and deforms, then slowly burns, and has combustion support properties

Characteristics and Manufacturing

Generally, refined cotton wool is used as raw material to produce cellulose triacetate ester, which is partially hydrolyzed into lower acetate (such as diacetate), and then dissolved in acetone to form a spinning solution and formed by dry spinning.

. Can be made into long or short fibers. Having the excellent properties of silk. The strength in the dry state ranges from 0.13 to 0.15 N/t (1.3 to 1.5 grams/dan), with an elongation of 25%. The strength in the wet state is 0.08~0.1 N/t (0.8~1 gram/dan), and the elongation is 35%. It can also be directly dissolved in dichloromethane without partial hydrolysis to form a spinning solution and formed by dry spinning, known as triethyl acetate fiber. Generally made into short fibers, it can be used as artificial wool. It can also be made into strong ethyl ester fibers, with a strength of up to 0.7 N/t (7 grams/denier), but with a very low elongation

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