Effect of Urea on shade of fabric, when everything in recipe is one to one.

SUBJ-8:

Effect of Urea on shade of fabric, when everything in recipe is one to one.

Chemicals:

Dye, Stock paste with varying concentration of  Urea.

Purpose of UREA:

UREA is hygroscopic agent and absorb water from surrounding during fixation and also help in get level shade.

Recipe:

Stock paste:

Mild. Oxidizing agent             10  g/Kg

Urea                                        Xg/Kg

Sodium Bicarbonate               25g/Kg

Alginate Thickener                  25g/Kg

Water                                      Balance

Total                                       1 Kg

Dye Glass:

Dye                                         50  g/Kg

Stock paste                              Balance

Total                                       1 Kg

Options:

Printing three fabrics with  different pastes as per follow.

1. UREA in stock paste 80g/Kg
2. UREA in stock paste 100g/Kg (Recommended as Standard)
3. UREA in stock paste 120g/Kg

Process:

Print and dry at 100-110°C.

Treat with Saturated steam at 102°C for 8 min

Washing:

§     Cold rinse

§     Soap at 60^oC With:

                        1-2 ml/l of Ladipur RSK liq.

§     Hot Rinse

§     Cold Rinse

Result:

Name                                   CMC                    STRENGTH

Urea 80g/Kg                                       STD                             STD

Urea 100g/Kg                                     0.23                             102

Urea 120g/Kg                                     0.42                             98

Remarks by AC:

Alternation of UREA specifically does not play critical role in fixation mode if steaming is done properly. Some shades like turquoise need more as much as twice amount of urea.. Urea is also used in pigment printing for limiting formaldehyde contents present in binder and fixing agents.