AVCO-BINDER SPC

BINDER FOR TEXTILE PRINTING
AVCO-BINDER SPC is a universal, very soft binder for printing all kinds of textiles
with aqueous pigment dispersions. It has a little effect on the viscosity of
synthetic thickeners.

SPECIFICATION:

Appearance White, free flowing liquid
Chemical nature Acrylic copolymer dispersion in water.
Compatibility Can be mixed with nonionic and anionic auxiliaries and pigments normally used in textile printing.
Density 1.01 – 1.02 g/cc (25°C)
Ionic nature Nonionic / anionic
Mechanical stability Good
pH 5.5 – 7.5
Re-dispersibility Good
Resistance to Electrolytes Good
Solubility Can be diluted in water at any propportion.
Storage Product should be stored in closed containers and protected against frost. After freezing product can not be re- used. When properly stored Storage stability is 12 months at least.
Viscosity Low viscosity

FILM PROPERTIES:

  1. Appearance – colourless, transparent.
  2. Handle – very soft, very flexible.
  3. Cross linkability – can be cross linked at temperature range of 140°C – 180°
    C. The
    reaction is accelerated with acid catalysts. Additional cross linkage is obtained
    by
    use of cross linking agent such as AVCO-PRINTFIX L.
  4. Wash and rubbing fastness – properly cured binder stands repeated laundry cycles,
    dry cleaning, dry and wet- crocking as occurred in normal handling of printed
    textiles. Fastness properties depend on type of substrate, binder/pigments ratio,
    curing conditions, other ingredients of printing paste, processes and auxiliaries
    used in fabric finishing. Fastness properties should be checked on each material
    before printing in bulk.
  5. Light fastness – very good.

PROPERTIES & USES:

  1. AVCO-BINDER SPC can be used as a binder for organic and inorganic pigments
    dispersions on all kinds of textile fabrics.
  2. AVCO-BINDER SPC is suitable for pigment resist printing under reactive dyestuffs.
  3. AVCO-BINDER SPC is suitable for discharge printing with pigments onto reactive
    dyestuff grounds.
  4. Product does not clog printing screens even at high printing speeds, high
    squeegee pressure and very fine screens.
  5. Prints produced with AVCO-BINDER SPC have a very soft handle and there is no need
    to mix it with butadiene binders.
  6. AVCO-BINDER SPC produces prints with very good fastness properties.
  7. Excellent stability to mechanical stress and shear produced while preparing and
    pumping the printing paste.
  8. Can be used in all aqueous or oil in water printing pastes with all types of
    anionic or nonionic thickeners (polyacrylic acids, guar derivatives).
  9. When added to ready made paste, the influence of AVCO-BINDER SPC on the viscosity
    is very low.
  10. Does not contain any solvents and other hazardous ingredients.

APPLICATION:

A. Printing paste preparation:
The following is a typical formulation:
gr/kg Remarks
WATER adjust to 1000 Use soft water
AVCO-ANTIFOAM PR 0-3 Important when printing large area
AVCO-CLEAR NP 18-24 Adjust to the needed viscosity
AVCOPRINT JN 0-10 Co-thickener to avoid bleeding problems
AVCO-BINDER SPC 60-180 Usage depends on quantity of pigment
AVCO-PRINTOSIL EM 0-10 Softener
AVCO-PRINTFIX L 0-6 Cross-linking agent
AVCOLOR PIGMENTS X Depends on required shade
The thickener and antifoam (if needed) are added to the water and homogenized with a high speed (1500-3000 r.p.m) homogenizer mixer for 5-10 minutes.
It is preferable to add the binder in portions and lower the mixer speed.
Preparation order should be as is shown in the recipe above. Continue mixing for a further 10-15 min.
Once a container of binder has been opened, the contents should be used as soon as possible. After product has been taken out, the container must be properly resealed to avoid skin formation when exposed to air.
REMARKS:
  1. The recipes are intended to serve as a guide and should adapted as necessary to local condition.
  2. The pH of the printing paste should be 7-8. If pH is lower, adjust with ammonia solution.
  3. Viscosity of the paste can be adjusted by increasing amount of AVCO-CLEAR NP. If viscosity is too high it can be corrected by adding small amount of electrolyte (di-ammonium-phosphate or ammonium sulphate).
  4. Use of AVCO-PRINTOSIL EM in printing formulation improves handle and increases dry-crocking fastness. It also has a positive effect on the brilliance of the prints.
  5. Use of AVCO-PRINTFIX L improves wash fastness and wet crocking fastness.
  6. Use of 4-6 gr/kg of AVCO-PRINT JN can overcome bleeding problems in printing. It improves the uniformity and appearance of a large printed areas and enhances production of brighter and deeper colors.
  7. Use of 1-3 gr/kg AVCO-ANTIFOAM PR can solve problems of foam while printing paste preparation and processing.
  8. If printing paste has to be stored for prolonged time add 1-2 gr/l preservative such as AVCOGARD-PR.
  9. While using hard water it is advisable to add sequestering agent such as AVCO-POLYQUEST KAL (do not use E.D.T.A types). Amount of thickener should be increased if necessary.
  10. If there is a problem of screen clogging, add 5-10 gr/kg AVCOPAL LUB.
  11. Printing paste produced with AVCO-BINDER SPC can be printed on fabric pre-treated with suitable softeners, which are not affecting the fastness properties of the prints. Such softeners are AVCOMIN LUB, AVCOSOFT UN and AVCOSOFT NIC.
After fixation there is no need for any further treatment. If customer demands additional finish check influence on fastness properties.
B.FIXATION
After printing and drying the printed fabric should be cured at elevated temperature with hot air for the proper time as shown in the following table:
Temperature (°C) Fixation Time (minutes)
140 4 – 6
150 3 – 5
160 2 – 3
170 1.5 – 2
180 1 – 1.5
Fixation can also be done with high temperature steam. Fix for 5-7 minutes at 160°C. Results are not as good as fixation in hot air.