GB/T 27592-2023 English PDF (GBT27592-2023)

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GB/T 27592-2023: Reactive dyes -- Determination of degree of fixation in pad dyeing
GB/T 27592-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.01; 87.060.10
CCS G 55
Replacing GB/T 27592-2011
Reactive Dyes - Determination of Degree of Fixation in Pad
Dyeing
ISSUED ON: MARCH 17, 2023
IMPLEMENTED ON: OCTOBER 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Instruments and Equipment ... 5
5 Reagents and Materials ... 5
6 Determination Method ... 5
7 Test Report ... 8
Reactive Dyes - Determination of Degree of Fixation in Pad
Dyeing
1 Scope
This document describes the determination method for the degree of fixation in pad dyeing of
reactive dyes.
This document is applicable to the determination of the degree of fixation in pad dyeing of
reactive dyes.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 2374-2017 Dyestuffs - General Rules for Dyeing Test
GB/T 2387-2013 Reactive Dyes - Determination of Shade and Relative Strength
GB/T 6687 Glossary of Dyestuff Terms
3 Terms and Definitions
What is defined in GB/T 6687, and the following terms and definitions are applicable to this
document.
3.1 degree of fixation
Degree of fixation is a characteristic index of the amount of dye on the fiber after the removal
of floating color.
NOTE: there are two methods for calculating the degree of fixation:
a) Based on the total amount of dye used for dyeing, which means the degree of fixation is
the ratio of the amount of dye fixed on the fiber to the total amount of dye put into the dye
bath;
b) Based on the amount of dye on the fabric before color fixation, which means the degree of
fixation is the ratio of the amount of dye per unit mass of fabric after color fixation to the
amount of dye per unit mass of fabric before color fixation.
3.2 pad dyeing
After the fabric is soaked in the dye solution, use a roller to roll-compact it, so that the dye
solution enters the gaps of the fabric; uniformly distribute the dye on the fabric, then, after
performing treatment under certain conditions (for example, steaming or hot-melting),
complete the dyeing process.
3.3 soaping
Soaping refers to the process of washing the dyed matter with detergent in a near-boiling water
bath after dyeing in order to remove the floating color on the surface of the dyed matter and
enhance the color fastness and color brightness.
4 Instruments and Equipment
The instruments and equipment shall comply with the relevant stipulations of Chapter 4 in GB/T
2374-2017:
a) Small padder for laboratory use;
b) Spectrophotometer;
c) Steamer or steam box for laboratory use;
d) Analytical balance, with a division value of 0.0001 g.
5 Reagents and Materials
The reagents and materials shall comply with the relevant stipulations of Chapter 3 in GB/T
2374-2017.
Sulfuric acid solution: use a graduated cylinder to measure-take 408 mL of analytically pure
reagent - sulfuric acid, slowly add it to 250 mL of water and mix it well.
6 Determination Method
6.1 Extraction Method
6.1.1 Principle
Perform pad dyeing and color fixation of the specimen on cotton cloth. By extracting a certain
mass of reactive dyes on the pad-dyed cloth specimen without steam fixation and the pad-dyed
cloth specimen with steam fixation, respectively determine the absorbance value of each extract
liquor and calculate the degree of fixation of the specimen in pad dyeing on fiber.
solution on the cotton cloth after the pad dyeing; after color fixation of the pad-dyed cotton
cloth, perform soaping. Then, respectively determine the absorbance value of the dyeing stock
solution and the soaping solution, and calculate the degree of fixation of the specimen in pad
dyeing on fiber.
6.2.2 Determination steps
6.2.2.1 Preparation of dye solution
In accordance with the relevant stipulations of 6.2.1 ~ 6.2.3 in GB/T 2387-2013, prepare the
dye solution. The mass concentration of the dye is specified as 20 g/L. Then, accurately weigh-
take 0.5 g ~ 1 g (accurate to 0.0001 g) of the dye solution m0, dilute to an appropriate constant
volume V0 and determine the absorbance A0 of the dyeing stock solution.
6.2.2.2 Pad dyeing
Accurately weigh the mass m (accurate to 0.0001 g) of the cotton cloth to be pad-dyed. In
accordance with the relevant stipulations of 6.2 in GB/T 2387-2013, perform pad dyeing. The
pad dyeing process is one dipping and one padding. After dipping the pad-dye solution,
immediately weigh the mass m1 (accurate to 0.0001 g) of the cloth specimen. In accordance
with the relevant stipulations of 6.2 in GB/T 2387-2013, perform color fixation on the weighed
pad-dyed cloth specimen. The selection of the color fixation method shall be based on the
specific variety and performance, with the principle of the highest chromogenic force.
6.2.2.3 Soaping
For the specimen after color fixation, use 1 g/L detergent MA solution to perform soaping at 95
C for 15 min, with the bath ratio of 1 : 25; use water to rinse the soaped cloth specimen, until
it is colorless, and collect the washing solution; combine the soaping solution and the washing
solution to an appropriate constant volume V; determine the absorbance A of the soaping
solution.
6.2.2.4 Determination
At the maximum absorption wavelength, respectively measure the absorbance of the dyeing
stock solution and the soaping solution.
6.2.2.5 Calculation
The degree of fixation F, which is counted by mass fraction (%), shall be calculated in
accordance with Formula (2):
Where,
A---the absorbance value of the soaping solution;