Textile finishing lab report (9)Title: To improve fastness properties of direct dyed sample by cationic

and crosslinking aftertreatment

Submitted by

M.Abu Bakar Zafar 06-NTU-001

M. Afzaal Sadiq 06-NTU-077

Adnan Latif 06-NTU-103

Asad Jamil 06-NTU-107

Farooq Zia 06-NTU-121

Kashif Hayat 06-NTU-123

Submitted to

Sir. Kashif Iqbal

NATIONAL TEXTILE UNIVERSITY FAISALABAD

AbstractIn this lab report first the bleached cotton fabric was dyed with direct dye. Dyed sample the n treated with cationic reagent and resin individually. Dyed fabric was finished with cationic reagent with three different concentrations. Similarly cross linking agent was applied with three different concentrations to fabric. After this washing of all samples including original dyed specimen was done and their washing fastness was checked and compared.

TABLE OF CONTENTS

Abstract…………………………………………………………………………………………2

1. Introduction…………………………………………………………………………………41.1. Background

…………………………………………………………………………41.2. Objectives.

……………………………………………………………..……………41.3. Theory

…………………………………………………………………………….…42. Equipments and materials ………………....…………………………………….…………4

2.1. Chemicals …………………………………………………………….………………5

3. Procedure……….……………………...……………………………………………………54. Results………………………………………………………………………………………65. Conclusion…………………………………..………………………………………………66. Samples ……………………..………………………………………………………………67. References …………………………………………………………………………….……6

1 Introduction

1.1. Background:

Direct dyes holds less market share due to its poor washing fastness. Different methods are used to increase fastness propeties upto 1 rating. These methods incldues diazotization, cationic treatmetn, formaldehyde treatment and crosslinkig.

1.2. Objective:

To dye fabric with direct dye Treatment of the dyed fabric with cationic reagent with different concentrations Treatment of the dyed fabric with cross linking agent with different

concentrations1.3. Theory:

Cationic treatmnent tends to increase molecular size of dye particles so results in increase washing fastness. While crosslinking agent crosslinks dye molecules with fibre and themselve as well.

2. Equipment and Materials

Pot for exhaust dyeing Plastic beakers Stirrers Weighing balance Padder Stenter 100 % Cotton fabric (woven)

2.1. Chemicals used

Direct dye Salt (NaCl) Alkali (Na2CO3)

Cationic after treatment ( RWIN FIC-400) Cross-linking agent (Repellan XLE)

Application Method

For dyeing

Exhaust method

For aftertreatment

Exhaust application (cationic treatment)Pad è Dry è Cure (crosslinking )

Conditions For dyeing

Direct dye = 2% o.w.f L: R = 1: 50 Salt (NaCl) Alkali (Na2CO3)

For aftertreatment with cationic reagent

Cationic reagent = 5, 10, 20 g/L Exhaust application at 600C for 20-25 min.

.For aftertreatment with cationic reagent

Cross-linking agent = 20, 30, 40 g/L Drying = 1200C for 2 min. Curing = 1500C for 90 sec.

.

3. Procedure

i. Cotton fabric was dyed with direct dye.ii. Fabric was weighed and calculations of chemicals were done according to it.

iii. Then water was heated, in that salt, alkali was added along with dye.iv. After this fabric was introduced to liquor.v. Dying of fabric was done at 900C for 30 min.

vi. Then three solutions of cationic reagent having 5, 10, 20 g/l conc. were prepared.

vii. Each solution of cationic reagent was heated up to 600C then dyed fabric was added in all solution.

viii. After this 25 min. were given to the reaction along with continuous stirring.ix. Then three solutions of cross-linking agent having 20, 30, 40 g/l conc. were prepared.x. Dyed fabric was padded in each solution and drying of each fabric was done followed by

curing at thermo sole.xi. Washing of samples were done and washing fastness was checked for each sample.

xii. Shade or toner change was also observed.

4. Results

Wash Fastness Rating Original sampleWashed

With cationic after treatment With cross linker5 g/l 10 g/l 20 g/l 20 g/l 30 g/l 40 g/l

3 4 4 3-4 3-4 3-4 3-4

5. Conclusion It was observed that fabric after treated with cationic and cross-linker had a bit shade

change than the original. In case of cationic after treatment the shade went from yellower region to bluer

region. In case of cross-linker the tone change can be seen in yellowish region. It was analyzed that cationic after treatment showed better improvement in washing

fastness than the after treatment with cross-linker. Original sample that had not been after treated showed least washing fastness.

6. ReferenceChemical finishing of textiles by W.D. Schindler and P.J. Hauser

7. Samples

Original Sample Washed original sample

Washed cationic treated sample (5 g/l) Washed cationic treated sample (10 g/l)

Washed cationic treated sample (20 g/l) Washed cross linker treated sample (20 g/l)

Washed cross linker treated sample (30 g/l) Washed cross linker treated sample (40 g/l)