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Anti phenolic yellowing

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Presentation Transcript
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Quench - APY

(2009-2010)

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Quench-APY

Anti Phenolic Yellowing

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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)
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Quench-APY

Mechanism Of Yellowing

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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.
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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).
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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.

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L. N. CHEMICAL INDUSTRIES

OFFICE ADDRESS :-

150 Adarsh Industrial Estate,

Sahar Road, Chakala,

Andheri (E), Mumbai – 400 099

Tel.- 91- 22- 4221 6789 (30 Lines)

91- 22- 2834 7513

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@lnchem.in

lnchem@vsnl.com