Studying effect of bicarbonate concentration on reactive printing.

SUBJ-9:

Studying effect of bicarbonate concentration on reactive printing.

Chemicals:

Dye, Stock paste with varying concentration of Bicarbonate.

Purpose of Bicarbonate:

Sodium bicarbonate is mild alkali which provide fixation condition to the dye and substrate when fabric undergoes steaming mode.

Recipe:

Stock paste:

Mild. Oxidizing agent                10  g/Kg

Urea                                        100g/Kg

Sodium Bicarbonate                 X  g/Kg

Alginate Thickener                   25 g/Kg

Water                                      Balance

Total                                       1 Kg

Dye Glass:

Dye                                         50  g/Kg

Stock paste                              Balance

Total                                       1 Kg

Options:

Printing two fabrics with two different pastes one containing 20g/Kg Bicarbonate and Other containing 25g/Kg(Recommended as Standard).

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

Sodium Bicarbonate(std)                    STD                             STD

25g/Kg

Sodium Bicarbonate                           0.87(WARN)              93.41

20g/Kg

Remarks by AC:

With decrease of fixing agent like bicarbonate, can decrease overall strength which is like 7 to 8%, as CMC data color report is clearly showing.