reactive & disperse dye

37
MD.MEHEDI HASAN RIMAN ID : 12132107012 Intake : 8 th Section : 01 BUBT Department of Textile Engineering Presentation on Reactive Dye & Dispersedye

Upload: mehedi-hasan-riman

Post on 11-Apr-2017

375 views

Category:

Engineering


31 download

TRANSCRIPT

Page 1: Reactive & Disperse Dye

MD.MEHEDI HASAN RIMAN ID : 12132107012

Intake : 8th Section : 01

BUBTDepartment of Textile Engineering

Presentation on

Reactive Dye & Dispersedye

Page 2: Reactive & Disperse Dye

Reactive Dye and Disperse Dye

Page 3: Reactive & Disperse Dye
Page 4: Reactive & Disperse Dye
Page 5: Reactive & Disperse Dye
Page 6: Reactive & Disperse Dye

6

Textile Auxilaries1 Salt- reduce negative charges on the fibers

2. Water - dyeing media

3. Soda Ash - excite the dye to link with the fibers with covalent bonding. Therefore, it enhances wet fastness

4. Fixing Agent - enhance wet fastness for heavy shade but usually reduce light fastness.

5. Levelling agent - for levelness dyeing

6. Retarding agent - for inhibiting the dye not attach to fibbers too fast

7. Acid - adjust the dyeing condition and make the fibbers to show negative charges

8. Water - dyeing media

Page 7: Reactive & Disperse Dye

Reactive Dyes

water-soluble compounds

give excellent wet-fastness

easy to hydrolyzed

Enough simple dyeing proses

Choice of more complete available color

Good color resilience

General Properties of Reactive dyes

Page 8: Reactive & Disperse Dye

Permanency of the color

Easy washing

Chemical Binding

Types of reactive dyes

Vinylsulphone Dye (VS)

Monochlorotriazine Dye (MCT)

Bi-functional Dye

Advantages of the Reactive Dyes

Page 9: Reactive & Disperse Dye

1. Hot reactive dyes 

    Reactive dyes which  have low reactivity ( monochlorotriazin

faction )

    Example of : Procion  HE  type ( ICI ) , Negative  HE  type

( Colorindo )

2. Cool reactive dyes

    Reactive dyes which  have high reactivity ( dichlorotriazin faction )

    Example :  Procion MX type ( ICI )

Based on its reactivity , reactive dye divided 2 faction :

Page 10: Reactive & Disperse Dye

Illustrating reaction which happened by at dyeing process between reactive dye with cellulose fiber

Page 11: Reactive & Disperse Dye
Page 12: Reactive & Disperse Dye
Page 13: Reactive & Disperse Dye
Page 14: Reactive & Disperse Dye

Side Reaction

•Hydrolysis of dichlorotriazine

1.Results in wasted dye

2.Economic and environmental concern•Typically fixation of around 60% is obtained

Page 15: Reactive & Disperse Dye

Dyeing Conditions

Time allowed for diffusion of dye into substrate‰ Concentration of dye in fiber is up to 500 times greater than in solutionAcidity difference creates ~25-fold excess cellulose anion

Page 16: Reactive & Disperse Dye

Leaving Groups

Variation of substituents = variations in fixation‰ “Cold” dyes = fixation temperature of 30-40°C‰ “Warm” dyes = fixation temperature of 50-80°C‰ “Hot” dyes = fixation temperature of >80°C

Page 17: Reactive & Disperse Dye

2004

17

REACTIVE DYES

This is an entirely class of dye introduced to the market in 1956.

They react chemically with the fiber being dyed & if correctly applied, cannot be removed by washing or boiling.

Page 18: Reactive & Disperse Dye

2004

18

REACTIVE DYES

The main feature of the dyestuff is its low affinity to cellulose; therefore large amounts of salt are required to force its deposition on he fabric.

Page 19: Reactive & Disperse Dye

2004

19

REACTIVE DYES

After this has been achieved, addition of alkali causes the deposited dyes to react with the fiber.

Only a successfully concluded reaction guarantees a fast dyeing.

Basically there are two types of reactive dyes: the cold dyeing & hot dyeing types.

Page 20: Reactive & Disperse Dye

2004

20

REACTIVE DYES - USE: Reactive dyes are used where

bright dyeing with high light & wash fastness is required.

Cold dyeing is used extensively in batik work.

Although some reactive dyestuffs have been specially modified to dye wool, their main usage is in dyeing cotton linen & viscose rayon.

Page 21: Reactive & Disperse Dye

2004

21

REACTIVE DYES Cold water fiber reactive dyes, suitable for dyeing on cotton, silk, jute, rayon & hessian.

Cannot be used on synthetics or fabric that has been coated with resin or drip-dry finish.

Yellow 2GLGolden Yellow 2RL

Orange 2R

ScarletRed BG (primary)Red 4B (bluish red)Red 8B (magenta)Rubinole 5BBrilliant Blue 2RBrilliant Blue BLViolet 2RTurquoise 2GNavy GRLBrown 2RBrilliant Green BLBlack B (blue base)Black 2B (green base)

Page 22: Reactive & Disperse Dye

DYES for SYINTHETIC FIBERS

Popular Dyes For Synthetic Fibers

Name of fibers Name of common dyes that are used

Polyester Disperse Dyes

Acetate (Cellulose acetate) Doesn't take dyes ordinarily. It requires cross dyeing.

Acrylic Disperse dyes

Mod acrylic Fiber Reactive Dyes

Modal Fiber Reactive Dyes

Nylon Cationic Dyes, Acid Dyes, Disperse Dyes

Orlon Disperse Dye

Rayon Acetate Rayon Dyes

Saron RIT Dyes

Spandex Disperse Dyes

Vinalon Doesn't take Dyes (in normal condition)

Vinyon Doesn't take Dyes (in normal condition)

Page 23: Reactive & Disperse Dye

Disperse Dyes DISPERSE DYES FOR DYEING IS DIVIDED BY 3 FACTION :1. Disperse dyes of the size molecule small Example  :  Dispersol  B ( ICI )

2. Disperse dyes of the size molecule mediumExample  :  Dispersol  C ( ICI )

3. Disperse dyes of the size molecule bigExample  :  Dispersol  D ( ICI )

Page 24: Reactive & Disperse Dye

2004

24

Dye for Other Fibres:Disperse Dyes for Polyester, Acetate

Cationic Dyes for Acrylic

Page 25: Reactive & Disperse Dye

2004

Introduction to Coloration & Finishing

25

Classification of dyesDye Class General description

Main application

Disperse Require skill in application (either by carrier or under high temperature); moderate price; complete color range; limited solubility in water (normally dispersed in water for application); good fastnessafter reduction clearing treatment; sublimation property.

Mostly used for polyester& acetate; can also be applied on nylon & Acrylic.

Page 26: Reactive & Disperse Dye

2004

26

DISPERSE DYES

The introduction of a new regenerated cellulose acetate fiber in 1920 led to the necessity to develop an entirely new range of dyes.

It was found that acetate (or Celanese) fiber had hardly any affinity for water-soluble dyes.

A new dyeing principle was introduced: dyeing with water dispersed coloured organic substances.

These finely coloured particles are applied in aqueous dispersion to the acetate material & actually dissolved in the fibres.

Page 27: Reactive & Disperse Dye

2004

27

DISPERSE DYES - USE:

Basically developed for dyeing of acetate fibres, Disperse dyes are also used for dyeing of polyamide (Nylon) & acrylic (Orlon & Acrylan) fibres.

With the addition of 'carriers' or swelling agents these dyes are also used in dyeing of Polyester (Terylene, Dacron, etc.)

Page 28: Reactive & Disperse Dye
Page 29: Reactive & Disperse Dye
Page 30: Reactive & Disperse Dye

Advantage and disanvantage:

1. Disperse dyes of the size molecule small  

-     Dyeing levelness very good

-     Hot resilience low

-     Temperature dyeing low ( economical energy )

-     Usable for dyeing 130 0C with very by good level

Page 31: Reactive & Disperse Dye

2. Disperse dyes of the size molecule medium  

-     Dyeing levelness good

  -     Good color resilience

-     Absorbtion dye into maximum fiber

-     Not sensitive to temperature and time

-     Accessible dye at characteristic temperature 130 C in a

short time

Page 32: Reactive & Disperse Dye

3. Disperse dye of the size molecule big  

-    Resilience color  to temperature very good

-    Sensitive to time and temperature

-     Need to process  reduction  clearing ( RC )

Page 33: Reactive & Disperse Dye

Disperse Dyes for Polyester Dyeing Method

1. High temperature high pressure dyeing

dyeing at atmospheric pressure

Fixation 45 to 60 minutes at 120°C t0 130°C

Page 34: Reactive & Disperse Dye

2. Carrier dyeing

carried out under atmosphere pressure by an addition of carrier

Fixation 90-120 min at 100°C.

3. Thermosol dyeing

continuous dyeing method

fixation dry heating for 60-120 sec. at 180- 210°C (depending on

the form of the material and type of disperse dyes)

Page 35: Reactive & Disperse Dye

Dyeing of polyester/cotton blend

Three well known exhaust dyeing procedures :

(1) a conventional two bath procedure

(2) a reverse two bath procedure

(3) a one bath, multi step procedure

Page 36: Reactive & Disperse Dye

(1) The conventional two bath procedure

1. first dyed with a disperse dye at pH 5-7 at 120°-140° C to dye

the

polyester.

2. removed from this first dye bath and transferred to a second dye

bath containing a fiber reactive dye, electrolyte and alkali.

(2)The reverse two bath procedure

1.first dyeing the cotton with the fiber reactive dye

2. dyed the polyester with the disperse dye in separate dye baths.

Page 37: Reactive & Disperse Dye

(3) In the one bath multi-step procedure

1. a single dye bath is prepared and the cotton portion of the blend

is

dyed alkaline conditions low temperature the presence of

electrolyte.

2.The dye bath is then acidified to lower the pH and a disperse dye

is

added

the polyester portion of the blend is dyed at 120° C. to 130°

C.