LyzerKlin RCA

(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' gives more colour value when fixed at 135 centigrade than compared to when fixed at 130 centigrade (for same steaming period in HTHP steamer). But being in combination with other low energy colours, steaming is usually carried out at 130 C. Washing liquor of printed goods, therefore, is loaded more with these type of ‘high energy’ Aq class of colours. LyzerKlin 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 LyzerKlin 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 LyzerKlin RCA.

While for goods to be carbonised, 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 & neutralisation 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 neutralisation.

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 LyzerKlin RCA is used as a soaping agent. Process box for soaping is high lighted to indicate the only differentiating process between conventional process & Process of washing with LyzerKlin 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 +
2 nd wash on winch NaOH 2 g/l at 80 C.
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 LyzerKlin DD 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.

THE ROLE OF LYZERKLIN RCA
LyzerKlin RCA removes Aq class of dyes in particular and other unfixed disperse colours, gums etc., in general. LyzerKlin RCA has excellent dispersing and wetting property to remove gums and unfixed disperse colours. It has a powerful complexing tendencies 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. LyzerKlin RCA produces tint free and bright prints.

LYZERKLIN RCA IN WASHING OF DYEINGS
After the dyeing is over, in a cooling dyeing bath itself add 1g/l of LyzerKlin RCA may be done. The product can be added at 130 C. in beam dyeing and at below 100 C. in jet 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 enblamed with dop 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.

Note:
According to our best knowledge and technical experiments, the above data is true and accurate. Regarding to variety of consumption procedures, it is recommended to evaluate the information before use.

 

 

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