PROTECTING%20COLOURS

1
PROTECTING COLOURS

• Why protect colours
• because bright colours need to keep bright?
• because dark colours will last longer?
• because it gives confidence to the consumer?

2
What affects colours during washing?

• Loss of loose dye on fibre (reactive dyes, vat
  dyes,etc)
• loss of dye of low affinity (direct dyes, acid
  dyes, disperse dyes)
• deterioration of dye by use of chlorine bleaches
• deterioration of dye by use of peroxide bleaches,
  making the colours duller or weaker

3
Peroxide attack

• During washing
• by perborates, percarbonates, peracids
• at 60ºC with detergents containing sodium
  perborate
• at 40ºC and below with detergents containing
  perborate activators, such as T.A.E.D.

4
Dyes sensitive to peroxide attack

• most sulphur dyes (5-10 dyes on cotton)
• most reactive dyes (70-80 of dyes on cotton)
• Some acid dyes on Nylon

5
AVOID PEROXIDE ATTACK

• Use peroxide free detergents
• use dyes that are not sensitive
• use colour protector

6
Peroxide free detergents

• Do not bleach textiles as efficiently
• Do not clean as effectively
• Do not kill bacteria as efficiently

7
Separate sensitive dyes

• Not practical to separate sensitive colours from
  safe colours
• dont know which colours are sensitive
• reactive and sulphur dyes are the most used dyes
  in cotton and acid dyes the only dyes used on
  Nylon

8
Colour protector-1

• Works at all temperatures (with or without TAED)
• Concentrations
• based on the perborate concentration because it
  is a free radical quencher, so it is dependent on
  the peroxide concentration and not on the dye
  concentration
• tested successfully at concentrations of 25 of
  perborate concentration(without
  microencapsulation)

9
Colour protector-2

• Works at all temperatures (with or without TAED)
• Effective at lower concentrations
• Based on the concentration of perborate as it is
  a singlet oxygen quencher
• Tested successfully at concentrations as low as
  20 the perborate concentration
  (microencapsulated)

10
Suggestions for its application

• Mixed with the detergent
• Mixed with the bleach
• As a separate detergent additive

11
Wash fastness tests

• 1,0 g/l sodium carbonate 2,0 g/l sodium
  perborate 4,0 g/l detergent ECE quencher 1 at
  0,5 g/l concentration
• washing test reagents added and dissolved at
  40ºC, wash liquor heated to 60ºC, kept at 60ºC
  for 30 minutes

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RESULTS

• Above 0,5 g/l the protection effect to perborates
  is maximum
• Dyes tested successfully
• Reactive Dyes
• Levafix Orange E3GA
• Levafix Golden Yellow EG
• Remazol Red RB
• Procion Yellow HE6G
• Cibacrone Blue FGF
• Sulphur dyes
• Hydrosol Black B