Niu® White Blue Liquid

Niu® White Blue Liquid

Niu® White Blue Liquid (newly developed) is Fluorescence Brightening Agent for polyester fibers. It gives brilliant Whitening effect, which has high fastness to sublimation, light and wet processing. It can be applied by Low or High Temperature Exhaust or Pad-Thermosol Method and suitable for whitening effect on texturised polyester and polyester/cotton. It is available as nonionic fluid dispersion Grayish Blue in colour. The dispersion is miscible with water and can be diluted to any desired concentration by adding water to it. All characteristics are similar to those applicable for low temperature fixation. In exhaust process even at 100ºC it gives excellent whiteness on Texturised Fabric and Yarn, It is stable to acids and alkalies, gives excellent fluorescent whitening effect at a wide range of pH value. It gives slightly blue to violet tint on fabric.


Exhaust Method:-

Preparation of Dispersion.

The required amount of Niu® White Blue Liquid is weighed out and stirred with 20 times of its weight of soft water at room temperature. The required volumes are made up adding more soft water.

  • High-Temperature Method
  • The bath is prepared with
  • 0.1-0.5% Niu® White Blue Liquid
  • 1.0 g/l Suitable dispersing agent
  • PH 4.5-5.5 with acetic acid
  • Material to liquor ratio 1:10

The material is entered at about 50º C and the temperature is slowly raised to 115ºC - 130ºC within 30 minutes. The treatment is continued at this temperature for about 30 minutes. The material is then washed in cold water and soaped at 60º C - 70º C for 10 - 15 minutes in 2 g/l. neutral detergents.

Pad - Thermosol Method :-


The fabric is padded through a pad-liquor containing 2-7.5 g/l Niu® White Blue Liquid at room temperature keeping 60-70% expression. The padded fabric is dried at approximately 120ºC.


The fixation condition depends on fabric construction. Heavy or densely woven fabric requires higher fixation temperature or longer fixation time than lighter fabric with open weave. However, following fixation condition may be taken as general recommendation:

  • For normal polyester & polyester/cotton: 175º - 190º C. for 30 seconds.
  • For Texturised Polyester: 170º - 180ºC. for 30 seconds.
  • The thermo fixed material may be given rinsing and light soaping treatment with 2 g/l neutral detergent at 60ºC - 70ºC. for 10 - 15 minutes.