BD

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MATACID® BD LIQUID Acid Buffer cum dispersant for dyeing of polyester and its blends

Technical Literature

INTRODUCTION It is widely known that pH control is an easy operation to be carried out. However, it is the most difficult feature in any industry. The control of pH in textile coloration processes is ensured by three fundamentally different techniques: - the maintenance of relatively high degree of acidity or alkalinity - the control of pH within fairly narrow tolerances mainly in the neutral region - the gradual shifting of the pH as a coloration process proceeds The dyeing of polyester at temperatures in the region of 120-140°C in beam and package dyeing machines has placed especially great demands on aspects of both initial dispersion quality and on subsequent stability under adverse conditions. Disperse dyes are susceptible to reduction under certain conditions. This instability to reduction is minimized by dyeing at the optimum pH, usually 4-5, in presence of air, and by keeping less dyeing time at high temperature. For this reason, Acid buffer is required to maintain a constant pH of the dye bath in the weakly acid region i.e. 4-5 with its buffering action and thus lead to perfectly reproducible dyeings even when using pH sensitive dyes. Matacid BD liquid is an acid buffer that not only maintains the pH 4-5 during polyester dyeing but also promotes uniform and stable dispersion of relatively small particles in a given matrix.

FEATURES • • • • • • •

Maintains a constant pH during the dyeing process Replaces dispersant ++ ++ ++ Has good sequestering action on heavy metals like Fe Cu Co Does not foam Is easy to handle in the liquid commercial form. Is phosphate free Is stable at high temperatures

PROPERTIES Appearance

Dark Brown liquid

Ionic nature

Anionic

pH

ca.3.0

Compatibility with Anionics Non-ionics

Good Good

General stability at recommended concentrations to hard water Very Good alkalis Good electrolytes Good high temperature Good

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SCOPE OF APPLICATION The additional usage of acid, acid salts or special dispersants is unnecessary. In contrast to volatile acids, such as acetic acid, Matacid BD liquid does not escape from the dye liquor, when dyeing in open bath. Matacid BD liquid forms complexes with heavy metal ions and thus prevents change of shade e.g. of copper sensitive dyes, but does not attack metal complex dyes. Exhaust dyeing of polyester and its blends : Set the dye-bath at 60°C with 1.0 - 1.5 % Matacid BD liquid (according to water condition) 0.5 - 2.0 % Matlevel LPF liquid (pH :4.5-5.5) Treat the material for 5 - 10 minutes. Then add dyestuff dispersion, run for 5-10 minutes. Raise the temperature to 130°C and carry out the dyeing at 130°C for 40-60 minutes.

SAMPLE RECIPE Dyeing of polyester fabrics 0.5 - 1.0 g/l 0.5 - 1.5 g/l 0.5 - 1.5 g/l 0.2 - 0.5 g/l x%

1.0 – 2.0 g/l 1.0 – 2.0 g/l

Matwet DFW liquid Matacid BD liquid Matlevel DLP liquid Matacid AS liquid (if required) Megaperse Dyes Treat at 130°C for 40-60 mins Rinse thoroughly for 20 minutes. Raise the temperature to 80°C Matwash RC liquid Caustic Soda Treat for 10-15 mins. Cold wash for 15-20 mins. Drain

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NOTE Customers are strongly recommended to conduct the lab trials using the product and make their own determination as to the suitability of usage and fitness of dosage of the product in their process.

PRODUCT SAFETY, HANDLING & STORAGE Customers considering the use of this product must read the following instructions before using the product : Prevention Use PPE : Wear hand gloves, protective clothing, safety goggles, face mask. Response IF SWALLOWED : Rinse mouth. Do NOT induce vomiting. IF ON SKIN : Wash with plenty of soap and water. IF INHALED : Remove victim to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES ; Flush eyes with plenty of water for atleast 15 minutes. IF ON CLOTHING : Rinse immediately contaminated clothing and skin with plenty of water before removing clothes. Storage Store in a cool, dry & ventilated area away from the sources of heat or ignition. Disposal Dispose of contents/container in accordance with local regulation.

For detail information on product safety, handling and storage guidelines, customers should review the Material Safety Data Sheet (MSDS).

® Tradem ark registered by Matex Bangladesh Limited. The sign ® appear only at the first mention of the product. _____________________________________________________________________________________________ The information and recommendations presented here were based on our general experience and correspond to the state of our knowledge. They are intended to service as non-binding guidelines and must be adapted to the prevailing conditions. We cannot accept liability for any injury, loss or damage resulting from reliance upon such information.

_________________________________________________________________________________________________ Head Office :

Biman Bhaban, 5th floor, 100, Motijheel C/A, Tel : 880-2-9562383 Dhaka-1000, Bangladesh Fax : 880-2-9562387 _________________________________________________________________________________________________ Factory :

East Chandora, Shafipur, Tel : 088-06822-51166 Kaliakoir, Gazipur, Bangladesh Mob : 01713-425868 _________________________________________________________________________________________________ researchdevelopment@m atexbd.com e-mail : _________________________________________________________________________________________________ web : www.matexbd.com _________________________________________________________________________________________________

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