Simply put, the cellulose content of Cellulose diacetate flake (referred to as diacetate flake) is usually above 98%. The essence of "cellulose content" refers to the purity of cellulose acetate, a chemical, rather than the content of raw natural cellulose.

key metrics

1. Acetyl content: The acetyl content of Cellulose diacetate flake is usually between 54% and 56%.

2. Aggregation degree: determines the viscosity of the solution and the mechanical properties of the final product, typically ranging from 180 to 300.

3. Moisture: usually controlled at ≤ 5%.

A more detailed explanation is as follows:

Cellulose diacetate itself is a chemical derivative. Its production process is as follows:

Starting from high-purity cotton short fibers or wood pulp (whose core component is cellulose).

Acetylation of hydroxyl groups on cellulose molecular chains is carried out through esterification reaction of acetic acid and acetic anhydride under the action of catalyst.

After a series of refining processes such as hydrolysis, precipitation, washing, and drying, cellulose acetate products are finally obtained.

In this process, impurities such as lignin, hemicellulose, ash, etc. in the raw material cellulose have been basically removed, and the cellulose molecular chains themselves are transformed into cellulose acetate through chemical reactions.

Therefore, when it comes to the cellulose content of Cellulose diacetate flake, a more accurate understanding is:

Product purity: In the final product, the content of cellulose acetate is extremely high, usually not less than 98%. The remaining minimal portion may contain trace amounts of moisture, residual catalysts (such as sulfates), and trace inorganic salts (ash) that have not been completely removed.

Degree of polymerization: In addition to purity, another key indicator is degree of polymerization, which represents the average length of cellulose molecular chains. The polymerization degree range of Cellulose diacetate flake is very wide, usually between 180 and 300 depending on the application (sometimes the range is wider, such as 150-550). The degree of polymerization of diacetate sheets in fiber bundles is usually low (such as 180-220), while the degree of polymerization of diacetate sheets in plastics (such as eyeglass frames and tool handles) is higher (such as 260-300).