AVCO-LON REK

LEVELLING AGENT FOR POLYAMIDE
AVCOLON REK is a levelling agent with weakly cationic nature with affinity to acid dyestuffs.It enables better control of exhaustion of acid dyestuffs onto polyamide dye sites and improves acid dyestuffs migration properties.

SPECIFICATION:

Appearance Yellowish clear liquid.
Chemical nature Polyethoxylated surfactant.
Compatibility Stable to acids, alkalis, water hardness and electrolytes. Compatibility with anionic products should be evaluated.
Ionicity Weakly cationic
pH (10% sol.) 8.5 ± 1
Solubility Miscible in water at any ratio.
Storage Below 0°C becomes viscous. Can be reused after thawing.

PROPERTIES & USES:

  1. AVCOLON REK has affinity to acid dyestuffs, and is slowing down the exhaustion rate
    onto the polyamide fibres. The result is much better migration properties of the
    dyestuffs, which yields better levelling of the dyeing process.
  2. AVCOLON REK can be used in combination with anionic levelling agent such as AVCOLON
    NAL in order to overcome barriness.
  3. AVCOLON REK is a liquid product which can be metered by automatic dosing equipment.
  4. AVCOLON REK is low foaming.
  5. Improves staining of elasten component in PA/Elasten blends.

APPLICATION:

  1. AVCOLON REK should be added to the dyebath before the dyestuffs.
    Recommended dosages are:
    Type of dyes

    % on weight

    Pale Shades

    Med. Shades

    Dark Shades
    Acid dyes (good migration)

    1.5

    1

    0.5
    Acid dyes (low migration)

    3

    2

    1
    Metal Complex dyes

    2

    1

    0.5

    REMARKS:

    • When there is a need to retard the rate of dyeing, and to improve compatibility between dyes, increase quantities for dark shades.
    • When there is a need to improve migration and levelling, increase dosage when dyeing pale shades.
  2. Typical dyeing procedures:
    A.Dyeing polyamide fibres
    1. 1.Add the following products to the dye bath:

      AVCOLON NAL 3.0 – 0.5g/l
      AVCOLON REK 3.0 – 0.5g/l
      AVCOCID HTA-200 1.0 – 3.0g/l
    2. Adjust pH according to the type of dyestuffs used.
    3. Add pre-dissolved dyestuffs and circulate for 5-10 min.
    4. Raise to the boil.
    5. Run for 30-45 min.
    6. Cool down and drop bath.
    B.Dyeing PA fabrics with severe “barre” problems:

    Good “barre” coverage can be obtained by pre-treating the fabrics at the boil with
    AVCOLON NAL, and by using a slightly cationic co-leveller AVCOLON REK in the dyeing bath.

    1. Pre-treat the fabric with 2-5% AVCOLON NAL for 20-30 minutes at the boil .
    2. Cool down to 60C , adjust pH to 5-5.5
    3. Add 0.5-3% AVCOLON REK run for 10 min.
    4. Add pre-dissolved dyestuffs by linear dosing over 15 min.
    5. Raise temperature to the boil.
    6. Dye for 45-90 minutes. Coverage of barriness can be improved when dyeing under HT conditions.
    7. Cool down and drop bath.
    8. Rinse well.
  3. Dyeing PA / EL blends
    Special selection of dyes is required to get tone to tone dyeing of polyamide and spandex.
    However the two step process is mostly recommended.
    step 1:
    AVCOLON NAL 2 – 3 g/l
    AVCOCID HTA 200 1 – 3 g/l
    Acid DyesX%
    Dye at 98°C for 30 min
    Cool down to 80°C
    step 2:
    AVCOLON REK 1 – 2 g/l
    Heat to 98÷C
    Run for additional 30 min. at 98°C.
    Cool down.
    Drop bath.
  4. Levelling of unlevel dyeing:
    1. Treat at the boil with 3-4 gr/l AVCOLON REK for 30 minutes.
    2. Cool down.
    3. Add acetic acid to the desired pH according to type dyestuffs used. The acid should be added slowly by dosing method.
    4. Raise temperature to the boil and treat at the boil for 30 minutes.
    5. Cool down, drop bath and rinse.