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SYNTHESIS CELLULOSE
ACETATE FIBER
BY DRY SPINNING
by
Nguyễn Thị Cẩm Nhung
MSE- K56
OUTLINE
 Definition of dry spinning
 Reaction
 Raw materials
 Process
 Characteristics
 Applications
 References
Dry spinning
 The polymer is dissolved in
a volatile solvent and the
solution is pumped through
a spinneret (die) with
numerous holes (one to
thousands).
 As the fibers exit the
spinneret, air is used to
evaporate the solvent so
that the fibers solidify
Reaction of cellulose axetate (CE)
 Molecular: [C6H7O2(OH)3-m(OOCCH3)m], m = 0~3

Reaction of cellulose axetate (CE)
 Molecular: [C6H7O2(OH)3-m(OOCCH3)m], m = 0~3
Raw materials
 CELLULOSE: [C6 H7O2(OH)3]n from pulp
 ACETIC ACID: CH3COOH and ACETIC
ANHYDRIDE: CH3CHO
 SULFURIC ACID: H2SO4
Process: Fiber formation
 Purified cellulose from wood pulp or cotton linters.
 Mixed with glacial acetic acid, acetic anhydride and
a catalyst (sulfuric acid).
 Put through a controlled 20 hour partial hydrolysis to
remove the sulfate and the required amount of
acetate molecules to obtain the product’s desired
properties.
Process: Fiber formation
Process: Fiber formation
 Precipitated as acid-resin flakes
 Flakes is dissolved into acetone
 Solution is filtered
Process: Fiber formation
 The liquid substance of
cellulose is forced
through a metal cap
called a spinneret
 The filaments extruded
from the holes in the
spinneret, the liquid
polymer becomes
rubbery and then
solidifies by hot air
 Solvent recovered
Process
Process: Fiber formation
Process: Stretching & Orientation
 While extruded fibers are solidifying, or in some
cases even after they have hardened, the filaments
may be drawn to impart strength
 The filaments are stretched while till plastic to
increase strength
 The filaments are then spun into fiber
Characteristics
 Classify: diacetate fiber and triacetate fiber
 Diacetate (acetate): 74% - 92% hydroxyl has been
acetylated
 Triacatate: > 92% hydroxyl has been acetylated
Characteristics
 Feels natural and is gentle on the skin
 Elegant gloss and chromogenic quality
 Drapes lightly and flexibly
 Ideal water absorption and quick-drying qualities
 Does not shrink easily, so provides stability for
dimensions and measurements
 Strong pleating durability (triacetate)
Applications
 Fabrics: used for linings in suits or coats, for formal
wear including wedding gowns, ribbon
Applications
 Filter cigarette tow :good
filtration properties with
good acceptance of the
taste signature, good
biodegradability profile
 Separation technology
Drinking water
purification, waste water
treatment
References
 Synthesis of Material: An approach from Chemistry
Dr: Le Minh Thang, HUST, 2008
 www.kpatents.com
 Mitsubishi Rayon Textile Co. LTD
 Wikipedia. Org and other sourses

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Synthesis cellulose acetate fiber

  • 1. SYNTHESIS CELLULOSE ACETATE FIBER BY DRY SPINNING by Nguyễn Thị Cẩm Nhung MSE- K56
  • 2. OUTLINE  Definition of dry spinning  Reaction  Raw materials  Process  Characteristics  Applications  References
  • 3. Dry spinning  The polymer is dissolved in a volatile solvent and the solution is pumped through a spinneret (die) with numerous holes (one to thousands).  As the fibers exit the spinneret, air is used to evaporate the solvent so that the fibers solidify
  • 4. Reaction of cellulose axetate (CE)  Molecular: [C6H7O2(OH)3-m(OOCCH3)m], m = 0~3 
  • 5. Reaction of cellulose axetate (CE)  Molecular: [C6H7O2(OH)3-m(OOCCH3)m], m = 0~3
  • 6. Raw materials  CELLULOSE: [C6 H7O2(OH)3]n from pulp  ACETIC ACID: CH3COOH and ACETIC ANHYDRIDE: CH3CHO  SULFURIC ACID: H2SO4
  • 7. Process: Fiber formation  Purified cellulose from wood pulp or cotton linters.  Mixed with glacial acetic acid, acetic anhydride and a catalyst (sulfuric acid).  Put through a controlled 20 hour partial hydrolysis to remove the sulfate and the required amount of acetate molecules to obtain the product’s desired properties.
  • 9. Process: Fiber formation  Precipitated as acid-resin flakes  Flakes is dissolved into acetone  Solution is filtered
  • 10. Process: Fiber formation  The liquid substance of cellulose is forced through a metal cap called a spinneret  The filaments extruded from the holes in the spinneret, the liquid polymer becomes rubbery and then solidifies by hot air  Solvent recovered
  • 13. Process: Stretching & Orientation  While extruded fibers are solidifying, or in some cases even after they have hardened, the filaments may be drawn to impart strength  The filaments are stretched while till plastic to increase strength  The filaments are then spun into fiber
  • 14. Characteristics  Classify: diacetate fiber and triacetate fiber  Diacetate (acetate): 74% - 92% hydroxyl has been acetylated  Triacatate: > 92% hydroxyl has been acetylated
  • 15. Characteristics  Feels natural and is gentle on the skin  Elegant gloss and chromogenic quality  Drapes lightly and flexibly  Ideal water absorption and quick-drying qualities  Does not shrink easily, so provides stability for dimensions and measurements  Strong pleating durability (triacetate)
  • 16. Applications  Fabrics: used for linings in suits or coats, for formal wear including wedding gowns, ribbon
  • 17. Applications  Filter cigarette tow :good filtration properties with good acceptance of the taste signature, good biodegradability profile  Separation technology Drinking water purification, waste water treatment
  • 18. References  Synthesis of Material: An approach from Chemistry Dr: Le Minh Thang, HUST, 2008  www.kpatents.com  Mitsubishi Rayon Textile Co. LTD  Wikipedia. Org and other sourses