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GB/T 42701-2023 English PDF (GBT42701-2023)

GB/T 42701-2023 English PDF (GBT42701-2023)

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GB/T 42701-2023: Textiles -- Identification of naturally colored cottons -- Chemical staining method

This document describes a method for the identification of naturally colored cottons (including natural brown cotton and natural green cotton) using the chemical staining method. This document applies to naturally colored cottons and their pure spinning products, blended or interwoven products of naturally colored cottons and uncolored fibers.
GB/T 42701-2023
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Textiles - Identification of naturally colored cottons -
Chemical staining method
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: MARCH 01, 2024
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 Principle ... 4
5 Reagents and equipment ... 5
6 Sampling ... 5
7 Specimen pretreatment ... 5
8 Test steps ... 6
9 Result judgment ... 6
10 Test report ... 6
Annex A (informative) Method for judging the starchy slurry in the sample and specimen desizing method ... 8
Annex B (informative) Typical colors of naturally colored cottons and their products before and after color test ... 9
Bibliography ... 12
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority shall not be held responsible for identifying any or all such patent rights.
This document was proposed by China Textile Industry Federation.
This document shall be under the jurisdiction of National Technical Committee on Textiles of Standardization Administration of China (SAC/TC 209).
The drafting organizations of this document: Zhejiang University of Science and Technology, Ningbo Inspection and Quarantine Science and Technology Research Institute, Zhejiang Jiushun Textile Co., Ltd., China Colored Cotton (Group) Co., Ltd., Guangdong Jusheng New Material Technology Co., Ltd., Zhejiang Huzhou Weida Group Co., Ltd., Hongdou Group Wuxi Hongdou Children's Wear Co., Ltd., Anhui Hanlian Color Spinning Co., Ltd., Wenzhou Institute of Technology.
Main drafters of this document: Ma Mingbo, Zhou Wenlong, Fu Kejie, Jin Zimin, Ren Qingqing, Jin Zihao, Liu Haifeng, Zou Jie, Yao Xueqiang, Ge Dongying, Zhang Heng. Textiles - Identification of naturally colored cottons -
Chemical staining method
WARNING -- Personnel using this document shall have practical experience in formal laboratory work. This document does not address all possible security issues. It is the user's responsibility to take appropriate safety and health measures and ensure compliance with the conditions stipulated in the relevant national laws and regulations.
1 Scope
This document describes a method for the identification of naturally colored cottons (including natural brown cotton and natural green cotton) using the chemical staining method.
This document applies to naturally colored cottons and their pure spinning products, blended or interwoven products of naturally colored cottons and uncolored fibers. 2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 6682, Water for analytical laboratory use -- Specification and test methods 3 Terms and definitions
This document has no terms and definitions that need to be defined.
4 Principle
Under the specified conditions, drop the color reagent to wet the specimen. The specific polyphenol pigment contained in the naturally colored cotton in the specimen will chemically react with the color reagent and change the color of the specimen. Observe the color change of the specimen to determine whether the specimen contains naturally colored cottons.
5 Reagents and equipment
Unless otherwise specified, all reagents are analytically pure.
5.1 Water: Grade III water in accordance with GB/T 6682.
5.2 4-(Dimethylamino) cinnamaldehyde: purity is ???95.0%.
5.3 Iodine-potassium iodide reagent: a mixed aqueous solution containing 1.3 g/L iodine and 2.4 g/L potassium iodide.
5.4 Sodium hydroxide solution: the mass concentration is 10 g/L.
5.5 Chromogenic reagent: prepare a mixed solvent containing concentrated hydrochloric acid (mass fraction is 36%~38%), water, and ethanol at a volume ratio of 1:1:3. Weigh 4-(dimethylamino) cinnamaldehyde (5.2). Dissolve in the mixed solvent at room temperature. It is prepared as a chromogenic reagent with a mass concentration of 2.0 g/L. Store the chromogenic reagent in a brown bottle at room temperature and away from light. The chromogenic reagent is valid for 30 days.
5.6 Reaction container: a Petri dish with a diameter of 90 mm or a beaker with a capacity of not less than 100 mL.
5.7 Oven: can keep the temperature at (60??1)???.
5.8 Constant temperature water bath: can maintain the temperature at (60??1)??? and (80??1)???.
6 Sampling
6.1 Loose fiber: randomly draw about 0.2 g of fiber from at least 3 sites. After merging, arrange them into straight parallel bundles.
6.2 Yarn: randomly cut 20 cm long yarn segments from at least 3 different bobbins, hanks or bobbins, totaling about 0.2 g. Combine them into yarn bundles. 6.3 Fabric: randomly cut a 5cm ?? 5cm cloth sample at least 5 cm away from the selvage edge for testing. For woven fabric samples, if necessary, the warp and weft yarns can be disassembled and tested separately. Indicate in the test report.
6.4 During the operation of sample preparation, the specimen shall be prevented from being contaminated.
7 Specimen pretreatment
7.1 If the specimen contains starchy size, the size shall be reduced first. See Annex A

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