Acrylic:
It is a
manufactured synthetic fibre in which the fibre forming substance is a very
long chain synthetic polymer composed of at least 85% acrylonitrile units by
weight.
Mod acrylic fibre:
Modified
polyacrylonitrilefibres are generally referred to as modacrylicfibres.
The
modacrylicfibres must be composed of at least 35% but not more than 85% by
weight of acrylonitrile units. The remaining percentage of their respective
polymer system is a polymer which makes the dyeing and printing of this fibre
easier.
Methylene group
 |
– CH2— CH— CH2— CH— CH2—
CH— CH2— CH— CH2— CH— CH2– CH– |
|||||||||
 |
|
|
|
||||||
CN CN CN CN CN
 |
|||
 |
|||
Nitrile
group Acrylonitrile
Fig:
Part of an acrylic polymer.
Commercial name:
Acrylic: End
use:
1.
Orlon - Spun yarn, high bulk yarn.
2.
Acrilan - High bulk yarn, Solara.
3.
Creslan - Yarn of dresses and blanket.
Modacrylic:
1.
Verel
2.
Dynel
3.
Teklan
4.
Kanekolan
Physical properties:
o
Tenacity : dry – 5 gm. /den, wet
– 4.8 gm. /den.
o
Elongation :
dry - 16%, wet – 17%
o
Moisture
regain : 1-2%.
o
Flammability :
More flammable, burns rapidly with bright, yellow flames, produces no residue.
o
Resiliency :
Good.
o
Abrasion resistance : Good.
o
Dimensional stability : Good.
Chemical properties:
o
Effect of acids :
Damage by strong concentrated acids. Good resistance to mineral acids.
o
Alkali :
Resistance to weak alkali but affected by strong alkali.
o
Solvents :
Resistance to solvents.
o
Bleaches :
Resistance bleaches.
o
Heat : Most heat sensitive.
o
Light : Resistance not for long time.
o
Dye : Acid, basic, cationic.
o
Conductivity :
Fair for electrical.
Features of Acrylic fibre:
- Appearance : The acrylic fibre appear as regulartranslucent slightly wavy
filaments
or staple fibre.
- Diameter : 15 µm to 25 µm.
- Color : Dull.
Uses of Acrylic:
o
All acrylic fibres used in knitted and woven
fabrics.
o
Blends of acrylic fibres with wool, cotton etc.
is prevalent on the market.
o
Bulky, soft and light fabrics are produced from
acrylic.
o
End uses such as blankets, carpets and
upholstery are excellent for acrylic.
o
Acrylic fibres are popular in sports wear, ski
cloths, children snow suits and sports shirts.
o
Used in industrial applications like filter
cloth, protective cloth etc.
o
Especially use of acrylics is wigs.
Uses of Modacrylic:
o
In manufacturing pile fabrics. i.e. blanket,
travel, cloths etc.
o
In manufacturing knitwear. i.e. sports shirts,
underwear, children garments.
o
In making carpets and used in upholstery.
o
Industrially used in filter cloths and
protective cloth.
Comments
Post a Comment