PRINTOGEN-RCA

PRINTOGEN-RCA

Reduction clearing agent for printed polyester fabrics and its blends.

(REDUCTION CLEARING AGENT)

Best and Eco-friendly 'Reduction Clearing Agent' for washing of 'Disperse colour Dyed and Printed Polyester materials.'

PHYSICAL & CHEMICAL PROPERTIES

1. Straw yellow to brown colored viscous, transparent liquid.
2. Typical but harmless odour.
3. Dilutes with water to any extent.
4. Non ionic and anionic blend working over wide range of temperature.
5. PH of 1 % solution about 7.0

MECHANISM OF WASHING

After printing and steaming, according to the chemical nature of the disperse dye and fixation conditions (steaming time, humidity and temperature), 70 to 90 % of disperse dye gets fixed on polyester. Some dyes of anthraquinonoid class (Aq class) require ‘higher energy’ for fixation. For example 'Disperse Violet IFBL' centigrade thangives more colour value when fixed at 135 centigrade (for same steamingcompared to when fixed at 130 period in HTHP steamer). But being in combination with other low C.energy colours, steaming is usually carried out at 130 Washing liquor of printed goods, therefore, is loaded more with these type of ‘high energy’ Aq class of colours. PRINTOGEN-RCA takes care of this parameter.
Disperse dyes of Azoic class (Az class) reduce with hydro - caustic and get discoloured. Hence their washing is comparatively easier when compared to Aq class of dyes. Aq dyes get reduced with hydrous caustic treatment to HAq form, thereby become water soluble, get spread all over the prints and in subsequent process when aired, get reoxidised to original form (Aq), without loss of tinctorial value. Subsequently on getting heat treatment, these colours develop on polyester, giving
Soiling of unprinted area and dulling of printed colours. This tendency has been taken care of while formulating PRINTOGEN-RCA. Many of Aq class of dyes (like 'Disperse Reds') soil viscous heavily compared to other dyes (Ref. BASF Manual). This tendency has also been taken care of when washed with PRINTOGEN-RCA.

While for goods to be carbonized, unfixed colour gets sulphuric acid treatment. It is well known that 70% Sulphuric Acid is a solvent to Aq Class of dyes. Water being non solvent, on dilution & neutralization the dye precipitates out in original form. In comparison, Az class of dyes get destroyed in 70% sulphuric acid. Hence tinting and soiling tendency of Aq type of dyes persists even after carbonizing. This poses a problem during carbonising & washing of prints. When subjected to carbonizing Aq class of dyes dissolve in 70% sulphuric acid, thereby get spread all over the prints and reappear as original on dilution during subsequent washing and neutralization.
Aq class of dyes are resistant to oxidation and their colouring power persists even after oxidation, i.e., even after peroxide / hypochlorite/ permanganate bleach. Hydro - caustic treatment if properly done, completely removes unfixed Az type of dyes washing off seems to be simple and complete for these dyes. However; all these conventional treatments do not seem to remove unfixed Aq class type of colours.
Washing of disperse printed fabric conventionally involves reduction clearing, bleaching (optional) & soaping processes. Our recommended process differs from conventional process only in soaping process where PRINTOGEN-RCA is used as a soaping agent. Process box for soaping is highlighted to indicate the only differentiating process between conventional process & Process of washing with PRINTOGEN-RCA.

CONVENTIONAL & RECOMMENDED WASHING PROCESS

FIRST PROCESS: COLD WASH

1 st & 2 nd end on jig or Cold running water treatment
1 st wash on winch or This removes excess of free
1 st kundi treatment colour, allows the printing gum to swell.

SECOND PROCESS: REDUCTION CLEARING & WASHING

3 rd & 4 th end on jigger Hydrous 3 - 5 g/l +
C.2 nd wash on winch NaOH 2 g/l at 80
2 nd kundi treatment At the end Hydrose to test
Positive to Vat Yellow GCN Paper.
5 th & 6 th end on jig or Cold running water treatment
3 rd wash on winch or This removes reduced azoic
3 rd kundi treatment or colors.

THIRD PROCESS: BLEACHING & WASHING (OPTIONAL)

7 th & 8 th end on jigger Either Bleaching with NaOCl
4 th wash on winch 3 g/l available Cl at R.T.
4 th kundi wash Or KMnO4* 2 gm/l + H2SO4
1/2 g /l at R.T.
Removes Gum, Hydrolysed Cols
9 th & 10 th end on jig or For HYPO BLEACH, Cold
3 rd wash on winch or running water treatment
3 rd kundi treatment or For KMnO4* BLEACH, Oxalic
Acid 2 g/l at R.T followed
by cold wash.

FOURTH PROCESS: SOAPING, WASHING & NEUTRALISING

11 th & 12 th end on jigger Soap with PRINTOGEN-RCA 2 g/l
4 th wash on winch + NaOH 1/2 g/l, Removes Aq
4 th kundi wash class of colours, gum, &
broken Az of Colours.
13 th end on jigger Cold running water, no
5 th wash on winch chemicals required.
5 th kundi wash
14 th end on jigger Acetic Acid 1 - 2 g/l
6 th wash on winch Goods at the end should
6 th kundi wash test acidic positively.

APPLICATION:
FOR PRINTED GOODS

1. Washing with cold water allows swelling of gums, removal of swollen gum and excess of unfixed colour. Repeat twice or trice this cycle till free from excess bleeding of colour.
2. Wash with hydrose 2 to 5g/l and caustic 2g/l and 60°C to 70°C for 20 to 30 minutes. The amount depends on M/L ratio, coverage of prints, depth of prints ( Printogen-RC can be added to this stage eliminating stage-5)
3. Repeat the caustic hydro treatment with half the concentration.
4. Cold wash
5. Soap at boil with 2 to 3g/l printogen-rc & 1g/l of acetic acid. colour can be seen in the bath after proper hydro caustic treatment & even after any additional oxidative treatment (if introduced)

REDUCTION CLEARING FOR DYED GOODS

PRINTOGEN-RCA can be used in washing off dyed goods after beam or jet dyeing process. After the dyeing is over, in cooling dyeing bath itself add 1gm/lit. of PRINTOGEN-RCA. The product can be added at 1300C in beam dyeing & at 1000C in jet dyeing, in acidic condition only. Allow cooling and circulation for
10 to 15 minutes or till required temperature is reached. Drain the dye bath and work as usual. The reduction clearing & cleaning of machine is also achieved simultaneously.
For dark shades drain the bath. Add oxalic acid 0.5g/l, PRINTOGEN-RCA 1gm/lit. and raise the temperature to 90 C for 10 minutes & then work as usual.
PRINTOGEN-RCA produces tint free and bright prints.

THE ROLE OF PRINTOGEN-RCA

PRINTOGEN-RCA removes Aq class of dyes in particular and other unfixed disperse colours, gums etc., in general. PRINTOGEN-RCA has excellent dispersing and wetting property to remove gums and unfixed disperse colours. It has a powerful complexing tendency with Aq type of dyes for their effective removal in
aqueous medium.Washed off Colours can be seen in the soap bath even after proper hydro caustic treatment and bleaching treatment has been carried out. PRINTOGEN-RCA produces tint free and bright prints.

PRINTOGEN-RCA IN WASHING OF DYEINGS

After the dyeing is over, in a cooling dyeing bath itself add 1g/l of PRINTOGEN-RCA may be done. The product can be C. in jet C. in beam dyeing and at below 100added at 130 dyeing. Allow further cooling and circulation for 10 to 15 min. or till required temperature is reached. The bath is drained & cooling cold wash with a short circulation is carried out to complete the process. The reduction clearing of cloth and cleaning of machine is achieved simultaneously. This is a short treatment & is good enough for majority of goods going further for cellulosic dyeing. However; if the cloth is embalmed with top dyed yarn at the salvages for brand name etc., the true colour of the label is shown only after Hydro- caustic treatment. If the full fastness properties are desirable then hydrous - caustic treatment is required to be carried out. In such cases the procedure for printed goods should be followed.

STORAGE: The product enjoys very good shelf life and warrants no particular storage conditions. However it is always advisable to have moderate conditions with the container being recapped tightly after use. 9 to 12 months if stored below 30°c.

Packing:
30 & 50 & Kgs in Plastic Container.