Quench APY

1
Quench - APY
(2009-2010)
2
Quench-APY
Anti Phenolic Yellowing
3
Quench-APY

• Causes of yellowing during storage
•  
• The intensive yellowing of white or pastel
  colored textile good is very often a result of
  the presence of phenol-based antioxidants
  (butylated hydroxyl toluene derivates).
•  
• This chemistry is low in cost and highly
  effective. Due to its low vapor pressure it is
  volatile and can be transferred to textile goods
  easily.
•  
• Products of this type are commonly used as
  stabilizers in Fibre production, Further textile
  processing.Packing materials (e.g. polyethylene
  wrapping films, packing material in general)
•  

4
Quench-APY
Mechanism Of Yellowing
5
Quench-APY

• Factors influencing the yellowing
•  
• Various factors influence the yellowing of white
  textile goods in presence of antioxidants
•  
• Storage conditions
• Atmosphere composition in store, shop and home
• (NOX beside other pollutants)
• Humidity and temperature
• Heating and ventilation
• Storage time
• Illumination
•  
• Composition of hot air, particularly on drying /
  curing/ heat-setting equipment with direct gas
  heating when nitrogen oxides are produced due to
  unproper burning conditions.

6
Quench-APY

• Precautions lowering the risk of yellowing
•  
• As long as such antioxidants are used it is
  virtually very difficult to prevent such
  yellowing. To reduce this yellowing we recommend
  
•  
• Warn customers to ensure that fibres and
  auxiliaries are free of phenolic antioxidants.
  Especially packing or wrapping materials should
  be free of antioxidants (phenol free low density
  polyethylene bags)
•  
•  Adjust the final finish with some non volatile
  organic acid (shade and optical brightener should
  be acid stable).
•  
• To avoid the presence of nitrogen oxides (NOX)
  during production and storage (no direct gas
  heat, all transportation systems such as
  fork-lift trucks with electric motors, good
  ventilation in warehouse to avoid air pollution).

7
Quench-APY
Normally white PA turn yellow even under slightly
acid conditions. This is due to the cationic
character of the free amino end-groups of PA
which interact with the antioxidant
derivates.   Quench APY is preventing such
yellowing while blocking the free amino
end-groups of the PA.   For the application in
general we recommend to use slight acid
conditions. Please check also whether the
optical brightener is acid stable if non-volatile
acids are used.            
8
L. N. CHEMICAL INDUSTRIES
OFFICE ADDRESS - 403, Antariksh,
Makwana Road, Marol Naka, Andheri (E), Mumbai
400 059 Tel.- 91- 22- 4221 6789 (30 Lines)
91- 22- 6692 4112 Fax -91-22- 2836 6434
FACTORY ADDRESS - D- 14 /10, T.T.C. M.I.D.C
Industrial area, Turbhe , P.O.K.U.Bazar, Navi
Mumbai 400 705 Tel.-91- 22- 4141 9899 (30
Lines) Fax -91- 22- 4141 9888
Email ID ketan_at_lnchem.in
lnchem_at_vsnl.com