GB/T 2374-2017Dyestuffs - General rules for the dyeing test (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 2374-2007, Dyestuffs - General Rules for Dyeing Test. Compared with GB/T 2374-2007, the major technical changes in addition to the editorial modifications are as follows: -- the title and expression of fibre are modified (see 3.3;

3.3 of edition 2007); -- the structure and expression of dyeing depth are modified (see 5.1;

5.1 of edition 2007); -- the title and expression of dyed fibre are modified (see 5.2;

5.2 of edition 2007); -- the expression of standard gradient selection is modified (see 5.3.3;

5.3.3 of edition 2007); -- the expression of dyeing bath ratio is modified (see 5.4;

5.4 of edition 2007); -- the expression of use amount calculation of reagents and auxiliaries is modified (see 5.5.1;

5.5.1 of edition 2007); -- the title, structure and expression of visual evaluation are modified (see 7.1.1;

7.1.1 of edition 2007); -- the expression of instrument measurement is modified (see 7.1.2;

7.1.2 of edition 2007); -- the recommended colour difference boundary values in the instrument measurements for the determination whether the shade conforms or not (see 7.1.2); -- "evaluation of results" is moved to 7.1.1 "visual evaluation" (see 7.1.1.5;

7.3 of edition 2007). This Standard was proposed by China Petroleum and Chemical Industry Association. This Standard shall be under the jurisdiction of the National Standardization Technical Committee on Dyestuffs (SAC/TC 134). The drafting organizations of this Standard. Zhejiang Runtu Co., Ltd., Shenyang Research Institute of Chemical Industry, National Centre of Quality Supervision and Inspection for Dyestuff. The main drafters of this Standard. Dong Zhongsheng, Gu Weidi, Zhu Minghui, Chen Sufen, Wang Yong. The previous editions of the standard replaced by this Standard are as follows: Dyestuffs - General Rules for Dyeing Test

1 Application Scope

China's national general rules for dyeing tests on dyestuffs. It specifies the general conditions under which a dyeing test is carried out for the determination of the properties of a dye. A dye has no properties in isolation. Its strength, its shade, its build-up, its levelness and its fastness are all properties of the dye on a particular fibre applied by a particular method, and every one of those numbers changes if the conditions change. The depth of shade obtained depends on the liquor ratio, the temperature and time profile, the electrolyte and the pH; the apparent strength of a dye compared with a standard depends on both being dyed at the same depth, because strength is not linear with concentration; and the fastness ratings depend on the depth at which the specimen was dyed, since a pale dyeing is almost always faster than a deep one. So a dyeing result quoted without its conditions is not merely imprecise, it is uninterpretable - and comparing two dyes dyed under different conditions is meaningless. That is what this standard exists to prevent. It fixes the substrate and its preparation, the liquor ratio, the water quality, the auxiliaries and electrolytes and their concentrations, the temperature and time profile of the dyeing, the after-treatment and washing off, and the drying and conditioning of the dyed specimen before assessment. The individual test methods of the dyestuff series - for strength, shade, fastness and the rest - are then written on top of these conditions rather than restating them, which is why this short document is cited by all of them. Issued on 31 May 2017 and in force since 1 December 2017, it replaces GB/T 2374-2007.

This Standard specifies the requirements for materials and reagents, requirements for apparatus, basic requirements for dyeing test, control of dyeing process and evaluation of dyeing results in dyeing (or printing) tests. This Standard applies to dyeing (or printing) tests of all varieties of dyestuffs.

2 Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced documents (including all amendments) applies to this Standard.

GB/T 4841.1-2006, Colour Cards of Standard Depths for Dyeing with Dyestuffs 1/1

GB/T 4841.2-2006, Colour Cards of Standard Depths for Dyeing with Navy Blue and Black Dyestuffs

GB/T 4841.3-2006, Colour Cards of Standard Depths for Dyeing with Dyestuffs 2/1, 1/3, 1/6, 1/12, 1/25

GB/T 6682-2008, Water for Analytical Laboratory Use - Specification and Test Methods

GB/T 6688-2008, Dyestuffs - Determination of Relative Strength and Color Difference - Instrumental Method

GB/T 8170-2008, Rules of Rounding off for Numerical Values and Expression and Judgement of Limiting Values

GB/T 25811, Standard Bleached Polyester Fabric Used for Dyeing Test

GB/T 25812, Standard Bleached Cotton Fabric Used for Dyeing Test

GB/T 25813, Standard Bleached Cotton Yarn Used for Dyeing Test

3 Requirements for Materials and Reagents

3.1 Reagents The chemical reagents and dyeing auxiliaries used in dyeing test shall be the normal

5.1.2.2 Colour fastness When colour fastness is tested, one or several depths may be tested as required by the applications of all dyestuffs. Each depth for dyeing selected shall be as specified in GB/T 4841.1-2006, GB/T 4841.2-2006 and GB/T 4841.3-2006. The standard depth for dyeing 1/1 or 1/3 may be selected as a general rule; the standard depth for dyeing light navy blue or light black may be selected for navy blue and black dyestuffs.

5.1.2.3 Other dyeing performances The depths for dyeing shall be specified in the standard or test method when the other dyeing performances of dyestuffs are tested. Unless otherwise stated, the standard depth for dyeing 1/1 specified in GB/T 4841.1-2006 is used as a general rule.

5 Basic Requirements for Dyeing Test...