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Quench APY

Anti phenolic yellowing

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Quench APY

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  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 :- 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

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