AVCO-CID HTA – 200

ACID DONOR AND pH REGULATOR FOR DYEING POLYAMIDE AND WOOL
AVCOCID HTA-200 is an acid donor that creates acidity when solutions of the product are heated up. The pH of 0.1% AVCOCID HTA-200 is 6.5-7.5, and when heated to the boil the pH decreases to 4.5- 5.5. The rate of dissociation is slow in cold solutions, and increases while heating up.This slow dissociation process is useful for dyeing wool and polyamide fibers, as the dyes are exhausted very evenly and produce level dyed yarns and fabrics.

SPECIFICATION:

Appearance Yellowish clear liquid
Chemical nature Blend of organic esters.
Compatibility Is not comopatible with strong alkalis.
Ionicity Nonionic
pH (10%) 7 + 0.5 (fresh solution)
Solubility Miscible with water. Solutions are not stable and start to hydrolize.
Storage Stored in a closed container in a cool place. Do not store in direct sun.

PROPERTIES & USES:

  1. AVCOCID HTA is an acid donor which evenly and slowly hydrolizes in hot aqueous
    solution to produce an organic acid.
  2. During the hydrolizing process the organic acid produced is lowering the pH of
    the solution down to 4.5-5.5 according to the concentration in the liquor.
  3. The rate of the dissociation is slow in cold solutions and increases when the
    temperature is raised.
  4. This manner of pH control makes it useful for dyeing acid and metal complex
    dyes. As the exhaution rate of acid dyes is pH dependent, the slow lowering of
    the pH in a dyeing solution containing AVCOCID HTA-200, ensures more level
    dyeing, due to slower exhaution rate of the dyestuffs onto the fibres.
  5. AVCOCID HTA-200 is recommended for even dying of polyamide, wool and blends of
    these fibres.
  6. When using AVCOCID HTA-200, the initial temperature of the dyeing can be
    increased, and the rate of heating up may be faster, thus reducing dyeing time.
  7. AVCOCID HTA-200 does not influence any of the fastness properties of the dyed
    fibres.

APPLICATION:

Following are some recommended dyeing procedures. The dosages, temperatures and procedures are suggestions which may be varried according to the type of dyestuffs used and properties of fibres to be dyed.
  1. Dyeing wool

    Use the following recipe:
    AVCOLON PAN 0.5 – 2.0 %
    Ammonium Sulphate 1.0 – 3.0 g/l
    AVCOCID HTA-200 0.5 – 1.5 g/l
    DYESTUFFS X%
    Start dyeing at 30°C, raise temperature to the boil at app. 45 min.
    Dye at the boil for 60 – 90 min. depending on the depth of the shade.
  2. Dyeing wool with an anti-shrink treatment:
    Use the following recipe:
    AVCOLON PAN 0.5 – 2.0 %
    ammonia sol. (25%) 1.0 – 2.0 g/l (adjust to pH 8-9).
    AVCOCID HTA-200 1.0- 2.0 g/l
    DYESTUFFSX %
    Start dyeing at 30°C, raise temperature to 60°C at 1.5° C/min. Hold at 60°C for
    10 min. Continue heating at 1° C/min. to the boil. Dye at the boil for 60-90 min.
  3. Dyeing polyamide/wool blends :
    Use the following recipe:
    AVCOLON PAN 0.5 – 2.0%
    AVCOCID HTA-200 0.5 – 2.0g/l
    DYESTUFFS X%
    Start dyeing at 30°C, raise temperature to 60°C at 1.5° C/min. Hold for 15 min.
    Continue heating at 1°C/min. to the boil. Dye at the boil for 60 min.
  4. Dyeing polyamide
    Use the following recipe:
    AVCOLON PAN 0.5 – 2.0 %
    Ammonium sol. (25%)1.0- 2.0 g/l (adjust to pH 7-8)
    AVCOCID HTA-200 0.5–1.5 g/l
    DYSTUFFS X
    Start dyeing at 40-50°c, raise temperature to the boil at 0.5-1.5°c/min. Dye at the boil for 60 min. Cool down to 70°c and drop bath. Rinse with cold water.
    Dosage of AVCOCID HTA-200
    LIGHT SHADES0.5-0.75 g/l
    MEDIUM SHADES1.0-1.5 g/l
    DARK SHADES 1.5-2.0 g/l