Yaa Consequence Of Temperature Slope Inwards Dissimilar Types Of Dyeing (Reactive & Disperse)

Effect of Temperature Gradient inwards Different Kinds of Dyeing (Reactive & Disperse)
Miraduzzaman Chowdhury Mugdho
Department of Textile Engineering,
Primeasia University, Dhaka
Email: immimugdho@gmail.com

Content:

1. What is temperature gradient?
2. What is reactive & disperse dye?
3. Recipe for reactive & disperse dye.
4. Importance of temperature slope for reactive & disperse dye.

Temperature gradient:
It is a physical quantity that describes inwards which direction too at what charge per unit of measurement the temperature changes the nearly chop-chop or hence a detail location. The temperature slope is a dimensional quantity expressed inwards units of degrees (on a detail temperature scale) per unit of measurement length. The SI unit of measurement is kelvin per meter (K/m).

Reactive dye:
A dye, which is capable of reacting chemically amongst a substrate to cast a covalent dye substrate linkage, is known every bit reactive dye. 

Fig: Dyeing

Recipe:

For mutual frigidity brand,

Reactive dye	1% OWF (1% stock)
Wetting agent	1cc/L(1% stock)
Nacl	50g/l
Sequestering agent	1cc/l
M:L	1:50
Sample weight	As required.
Time	30min
Temperature	40 degree
PH	10
Soda	20g/l

For hot brand,

Reactive dye	1% OWF (1% stock)
Wetting agent	1cc/L(1% stock)
Nacl	50g/l
Sequestering agent	1cc/l
M:L	1:50
Sample weight	As required.
Time	30min
Temperature	80 degree
PH	11.5
Soda	30 g/l

Why temperature slope is necessary for cotton wool cloth amongst reactive dye?
Temperature of hot build & mutual frigidity build of reactive dye is xl & lxxx score c. If nosotros increase the temperature really firstly than at that spot volition live hydrolyses reaction. It is the reaction betwixt H2O too dye. Proper temperature gradient(2degree/min) gives fourth dimension to soaks the cloth to H2O proper adsorption of dye to cloth surface. When the solution volition ambit required temperature than sodium hydroxide is using every bit fixing agent.

So, without proper temperature slope at that spot is possibility of variation of shade because of wastage of dye from hydrolyses reaction.

Disperse dye: 
Dyes are coloured, unsaturated organic chemic compounds capable of giving color to a substrate (a textile), i.e. colouring or dyeing it.

There is iii types of dyeing method which is given below:

1. Carrier Dyeing Method
2. High Temperature Dyeing Method
3. Thermasol Dyeing Method

Why temperature slope is necessary for polyester cloth amongst disperse dye?
In illustration of dyeing amongst disperse dye, temperature slope (4 degree/min) plays an of import role. For the swelling of fibre, temperature higher upward 100°C is required if heat dyeing method is applied. Again inwards illustration of carrier dyeing method, this swelling occurs at 85-90°C. If it is kept for to a greater extent than time, hence dye sublimation too loss of cloth delineate may occur. Temperature slope every bit good influence the aggregation of dyes & swelling of fiber. The charge per unit of measurement of swelling of fiber is ever to a greater extent than than the aggregation of dyes. Otherwise proper dyeing volition non possible.

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