Helo, reders today i m going to explain about exllent information of sulphur dyeing.
If you want to know in details about Sulphur dyeing process. then this article for you.
You injoy and understand properly but if you read complete article.
I have made this guide to help you out.
So, hold your seat and be with the end of guide.
So, you could get valuable information regarding Sulphur dyeing process, properties, dyeing process, recipe, fults and more.
Let’s get started,
Sulphur dyeing process
• Sulphur dye are more profitable and valuable for cellulose fibres.
• Sulphur dyes have ability to produce deep shade products. Sulphur dyes is also use for printing.
• Sulphur dye having ability to produced heavy materials such as rubber materials or more.
• Wool and proteins fibres production is not possible for dyeing.
• Sulphur dyes having not ability to produce other colour shade such as red, orange, yellow.
• Sulphur dye is used for, cotton fabric dyeing, and denim fabric dyeing also.
• Sulphur dyes is more suitable and profitable dyes for cellulose.
• Sulphur dyes are more popular for black and brown shade production.
Sulphur dye properties
– Sulphur dyes are insoluble in water.
– Sulphur dyeing is favourable cost structure.
– Alkaline condition is required for dyeing.
– Sulphur dyeing is one of the most popular for black, brown and blue shade production.
– Sulphur dyes are not more costly process.
– electrolyte is used for exhaust dyes.
– After treatment is required for shade development.
– oxidation treatment is required for shade development in case of Sulphur dyeing.
– Striping is required for uneven dyeing.
– Sulphur dyes is also used for dyeing and print.
Sulphur dyes characteristics
In case of Sulphur dyeing here the main characteristics given below
– oxidation chemical treatment is required for colour and shade development.
– Sulphur dye is more popular for deep shade.
– washing fastness is good because the dye particle of sulphur dye is big and insoluble in water
– In case of sulphur dyes, dye particle of sulphur dye is converted into leuco form with the treatment of dilute aqueous Na2S.
– dyeing is done properly because sulphur dyes contain dye -S -S – dye
dye – S-S – dye
/ Di sulphide
– Sulphur dyes are reoxidized after dyeing by air.
– hydrogen peroxide is also used for oxidation in sulphur dyeing.
– No more costly process
Sulphur dyeing recipe
Sulphur dye – 8 – 12%
Reducing agent – 8 g/l
Alkali (Na2CO3) – 10 g/l
NaOH – 5 g/l
Salt (NaCl) – 10 g/l
Wetting agent – 1 g/l
Sequestering agent – 1 g/l
Leveling agent – 1 g/l
Time – 40 minute
Temp – 80°c
Chemically Function in Sulphur dyeing
1. Role of leveling agent
• lower the initial rate of dyeing.
• Control the migration steps of dye.
• if the levelling agent is not use then double dye to dyed the fabric.
2. Role of Wetting agent
• Reduce surface tension with the help of wetting agent because if wetting agent is add in dye bath then it reduces surface tension, results dye is enter properly in to the fibre.
3. Role of Sequestering agent
• Sequestering agent is used during dyeing because it control increase hardness of water.
In simple water some unwanted ions are persent such as magnassim or more and this water is not proper for dyeing.
This is the reason, Sequestering agent is add in dye bath it help to remove hardness of water and it’s also remove unwanted ions.
4. Role of Reducing agent
• steps – 1
first of all add dyeing chemicals such as, levelling agent and then add wetting agent. Temp will be 40°c of bath.
• steps – 2
Add dye solutions in same temp.
• steps – 3
Introduce fabric in dyeing bath.
• steps – 4
Add 1/2 salt in dyeing bath and then raised temperature up to 60°c.
• steps – 5
Again add 1/2 salt and the again raised the temp up to 90°c. and dyeing continue at same temperature. and dyeing time will be 40 mint.
• steps – 6
And then cooling – rinsing – washing – after treatment is carried out for shade development.
Sulphur dyeing (faults)
Here, if tendering broblme will occur on the fabric. then wash properly with CH3COONa.
In case of Sulphur dyeing, Bronziness fults is directly related with shade change or colour change. Shade is not properly match with required shade or colour.
This is also a big faults in case of Sulphur dyeing. Shade is not matching after dyeing.
But this problem is also solved by using some useful chemicals.
Use NaHSO3 in conjunction with NaOH and Na2S.
This is a simple process.
treat with boiling soap soon
Soaping chemicals – 1 g/l
Temp. – 95° to 100°c
Time. – 10 – 20 mint
Advantage of sulphur dye
• Textile Sulphur dyeing process is not more costly.
• Sulphur dyes having ability to produced deep shade product.
• Sulphur dyes are also used in printing.
• wash fastness and light fastness is good.
• dyeing process is done with low energy.
• Sulphur dyes are available in powder form or also soluble form.
• manufacturing process is done easily.
Disadvantage of sulphur dye
Uses of sulphur dye
Eco-friendly Sulphur dyeing process
Frequently asked Question
1. What is black sulfur?
Actually black sulfur is made from 2,4 dinitrophenol. these are simple process to produce sulphur black dye or colour which is use in textile materials.
2. What is ingrain dyes?
A dyes that is formed inside a substrate by the combination of two or more chemicals that individually cannot colour the substrate is called an ingrain dye.
For example: An azoic dye is good example of an ingrain dye.
they are not a readymade dye but are produce by the dyer inside on the fabric from 2 components usually referred to as naphthols and bases or azoic coupling.
3. What is relation between structure of dye and fastness properties?
Fastness properties:- these are the prop of dyes which indicate the tolerance of the dyes on fibers towards the action of various foreign company, such as light, washing, heat, rubbing, perspiration, milling, (rotuting in wash wheel) etc.
Light fastness of a dye on a particular fibre is expressed in terms of grade 1 – 8.
Grade 1 – very poor
Grade 2 – poor
4. Classification of dyes according to the chemical structure?
Classification of dyes is as follows,
1. Nitroso dyes 8. Thiazole
2. Nitro dyes 9. Azine
3. Azo dyes 10. Thiazine
4. DPM dyes 11. AQ
5. TPM 12. Indigoid
6. Xanthere 16. Azoics