pigment definition is indicates, it is one types of coloured (black and white). it is easily impart variety of colour.
Helo, reders today i am going to explain about pigment. So hold your seat and read complete article.
What is pigment?
pigment definition is expressed, A pigment is define as coloured black or white substance which is insoluble in the medium in which it is applied and imparts colour and opacity to this medium.
Classification of pigment
1. Inorganic pigment:- it is finely devided inorganic usually a stable solid which is added to vehicle to produce a stable surface coating.
2. Organic pigment:- these are whelly organic water insoluble comp. It is produce by a wind variety of chemical reaction.
Difference between inorganic and organic pigment
Difference between inorganic and organic pigment (full explanations).
Organic: – high in price and brilliant colour
Characteristics – inorganic – organic
1. Colour – Bright – dull
2. Light fastness – varies – excellent
3. Tinting strengths – high – varies
4. Opacity – varies – high
5. Resistance to – varied – excellent solvent bleed
6. Resistance to chemicals – varied – good
7. Ease of dispersion – varies – much easier than organic
8. Thermal stability – varies – usually higher than organic.
Dyeing of cellulosic and its blends with pigment.
Pigment dyeing
Continues dyeing with pigment colour
This process contain generally three process
1. Padding
2. Drying
3. Curing
Padding
Padding of p/c blend fabric
Recipe;
Pigment – x%
Binder – 80-100 gpl
Migration inhabitor – 10-20 gpl
Acid liberating catalyst – 4 gpl
Liquor pick up – 60-70%
and
Pigment emulsion
Binder
A.Acid (30%)
Ammonia chloride
Water.
Drying
Drying with hot fluid / drier
Curing
Curing at 150° temp for 4 mint for fixation of binder on the surface of fabric.
Curing is play very important role for proper fixation of binder on the surface of fabric or materials.