Nestol - PYP | Anti-Phenolic Yellowing Agent

• Product Information

  Nestol - PYP is a high performance composition designed for treating fabrics & garments from yellowing due to storage conditions.

• Key Features & Benefits

  • It is used as stabilizers in fiber production, textile processing and packing materials (e.g. polyethylene wrapping films, packing material in general).
  • It is low in cost and highly effective.

   

• Application

  Background:

  Normally, white polyamide (PA) turns yellow under slightly acidic conditions due to the cationic character of the free amino end-groups of PA interacting with the antioxidant derivative. Nestol-PYP prevents such yellowing by blocking the free amino end-groups of the PA. For general application, it is recommended to use slightly acidic conditions. Ensure the optical brightener is acid-stable if non-volatile acids are used.

  PAD Process:

  • Softener: 20 - 30 g/l
  • Nestol - PYP: 5 - 10 g/l
  • pH of bath: 5.5 - 6.0
  • Drying: As usual
  • Curing: @160ºC for 1 min

• Advantage

  Causes of Yellowing:

  • 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.

  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 (NO_X 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 improper burning conditions.

• Properties

  • Appearance: Yellow to brownish transparent viscous liquid
  • Composition: Sulfonic acid salt
  • Ionic Nature: Anionic
  • pH (2% in distilled water): 7.0 ± 1.0
  • Miscibility in water: Miscible
  • Stability: Stable
  • Compatibility: Compatible with nonionic & anionic products