Acid Dyes

Acid Dyes – Manufacturer & Exporter

Mehul Dye Chem Industries is one of the leading manufacturers & exporters of Acid Dyes.

Products

• Acid Scarlet MOO

  CI Name : Acid Red 73
  CI No: 27290
  CAS No : 5413-75-2
  

• Acid Metanil Yellow

  CI Name : Acid Yellow 36
  CI No: 13065
  CAS No : 587-98-4
  

• ACID ORANGE II

  CI Name : ACID ORANGE 7
  CI No: 15510
  CAS No : 633-96-5
  

• ACID SCARLET 3R

  CI Name : ACID RED 18
  CI No: 16255
  CAS No : 2611-82-7
  

Acid Dyes

Acid dyes are anionic organic dyes (containing sulfonate groups) that are used with organic cations such as alum to fix them to the surface of fibres.Acid dyes are highly water soluble and have better light fastness than basic dyes.The textile acid dyes are effective for protein fibres such as silk, wool, nylon and modified acrylics.Acid dyes, named for their application under acid conditions, are reasonably easy to apply, have a wide range of colours anddepending on dye selection, can have good colour fastness properties. The dyes are divided into three categories according to their levelling and fastness properties, namely levelling, milling and super milling dyes.

Molecular weights of acid dyes range from 200 to 900.

Chemical structure of acid dyes

These dyes are normally very complex in structure but have large aromatic molecules, having a sulphonyl or amino group which makes them soluble in water. Most of the acid dyes belongs to following three main structural molecules,

• Anthraquinone type
• Azo dye type
• Triphenylmethane type

Molecular Chemistry of Acid Dyes

They contain sulphonic acid groups, which are usually present as sodium sulphonate salts. These increase solubility in water and give the dye molecules a negative charge. In an acidic solution, the -NH2 functionalities of the fibres are protonated to give a positive charge: -NH3+. This charge interacts with the negative dye charge, allowing the formation of ionic interactions. As well as this, Van-der-Waals bonds, dipolar bonds and hydrogen bonds are formed between dye and fibre. As a group, acid dyes can be divided into two sub-groups: acid-leveling or acid-milling.

Properties of Acid Dyes

• Acid dyes combine with the fiber by hydrogen bonds, vanderwaals forces or through ionic linkages.
• Acid dyes have no affinity for cotton cellulose’s, hence not suitable for cellulosics.
• Acid dyes are anionic in nature.
• Acid dyes are suitable for wool, silk, polyamide and modified acrylics.
• Acid dyes applied from a strongly acidic to neutral pH bath.

Procedure of Acid Dyes

Dye bath set with

• 5-10% Anhydrous Glauber's Salt 2- 4% Sulphuric Acid (96%)
• 5-10% Anhydrous Glauber's Salt 2-4% Formic Acid (85%)
• 5-10% Anhydrous Glauber's Salt 2-4% Glacial Acetic Acid (40%)

Well dissolved dyestuff is added to one of the above-mentionedbaths (Depending on the chemical nature of the dye) while stirring.

The material is entered at about 50°C after running for five minutes temperature is raised gradually to boil and dyeing continued for 45- 60 minutes. If required 1-3% Sulphuric Acid is added after 45 minutes to complete the exhaustion.

Procedures

1:1
Metal complex dyes: These dyes exhibit good migration properties and have good light fastness and wet fastness properties.
Dye bath: 5 -10% Glauber's Salt, 4-5% Sulphuric Acid
Enter the goods at 60°C and raise temperature of the dye bath to boil dye for 90 minutes. Rinse and dry.

1:2
Metal complex dye: These dyes have excellent levelling properties, highlight fastness properties and used widely for combination shade because of excellent dyeing behaviour.
Dye bath : 1-3% Ammonium Sulphate (pH 6-6.5), 5-10% Glauber's Salt
Enter the goods at 50°C and rise the temperature of the dye bath to boile dye for 45- 60 minutes. Rinse and dry.

Mehul Dye Chem Industries – Manufacturer & Exporter of Acid Dyes

Since 1992 Mehul Dye Chem Industries is manufacturing Acid Dyes in its facility located in Ankleshwar. We manufacture acid dyes such as Acid Scarlet MOO & Acid Metanil Yellow. With limited product portfolio in Acid Dyes we have expertise for quality manufacturing with large facility of in Ankleshwar (Gujarat) India. Mehul Dye Chem Industries has already developed Acid dyes for application on leather, wool, nylon, silk etc.

Packing of Acid Dyes

Acid Dyes are available in the packing of 25 kg / 50 kg Brand New Plastic Drums / Carton Boxes / Iron Drums like Acid Red, Acid Yellow.