Cellulose acetate (CA) is a thermoplastic biobased polymer material obtained by chemical modification of natural cellulose as raw material. It is renewable, easy to process, and has good properties, and has a wide range of applications.

1、 Basic Definition and Source

Essence: Cellulose esters formed by replacing hydroxyl groups (- OH) on cellulose molecules with acetyl groups (- COOH3) belong to semi synthetic polymers.

Raw materials: Natural cellulose such as cotton short fibers and wood pulp, sourced from renewable sources.

CAS number: 9004-35-7.

2、 Core classification (by degree of acetylation/degree of substitution)

The performance is determined by the degree of substitution (DS) and is mainly divided into three categories:

Cellulose Acetate (CMA) 1.7~1.95

Cellulose Diacetate (CDA) 2.2~2.76

Cellulose triacetate (CTA) 2.76-3.0

3、 Key physical and chemical properties

Appearance: White/transparent, odorless, tasteless, non-toxic granular, powder or fibrous solid.

Density: Approximately 1.3 g/cm ³.

Melting point: 230~300 ℃, good thermoplasticity and melt flowability.

Solubility: Diacetic acid is soluble in acetone; Triacetic acid is only soluble in dichloromethane, chloroform, etc., and insoluble in acetone.

Other: tough, transparent, glossy, mold resistant, easy to dye, biodegradable.

4、 Mainstream application areas

Tobacco industry (maximum application): Diacetate fiber is used to make tobacco filter rods, which adsorb tar and improve taste.

Optics and Electronics: Cellulose triacetate (TAC) is the core protective film for LCD polarizers; Used for movies/photographic films.

Textile and clothing: Acetate fiber (acetate fiber), feels like real silk, breathable, easy to care for, used for high-end fabrics and linings.

Daily use and engineering plastics: eyeglass frames, tool handles, pen holders, toys, automotive interior parts, etc.

Membrane separation: seawater desalination, water purification, dialysis, drug controlled release membrane, etc.

Medicine: drug sustained-release coating, transdermal drug delivery carrier.

Other: Coatings, inks, adhesives, packaging materials, etc.

5、 Production and Environmental Protection

Process: Cellulose+acetic acid/acetic anhydride → esterification → hydrolysis → precipitation → washing → drying, adjusting the degree of substitution to obtain different products.

Environmental Protection: The raw materials are renewable and the products are biodegradable, belonging to the category of green materials.