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GB/T 35443-2017 English PDF (GBT35443-2017)

GB/T 35443-2017 English PDF (GBT35443-2017)

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GB/T 35443-2017: Textiles -- Quantitative chemical analysis -- Mixtures of alginate fiber and certain other fibers

This Standard specifies the method to determine the content of alginate fiber in two-component mixture of alginate fiber and certain other fibers after removing non-fibrous material. This Standard applies to two-component mixture of alginate fiber with cotton, linen, cupro fiber, viscose fiber, modal fiber, lyocell fiber, polyacrylonitrile fiber, polyester, polyamide fiber, spandex, wool, acetate, or triacetate. NOTE: See Annex A for the qualitative identification method of alginate fiber.
GB/T 35443-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 59.080.01
W 04
Textiles - Quantitative chemical analysis - Mixtures of
alginate fiber and certain other fibers
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Two-component mixture of alginate fiber with cotton, linen, cupro fiber, viscose fiber, modal fiber, lyocell fiber, polyacrylonitrile fiber, polyester, polyamide fiber or spandex (sodium hypochlorite method) ... 4
4 Two-component mixture of alginate fiber and polyester fiber (sulfuric acid method) ... 6
5 Two-component mixture of alginate fiber and polyacrylonitrile fiber or spandex (dimethylformamide method) ... 6
6 Two-component mixture of alginate fiber and wool (sulfuric acid method) ... 6 7 Two-component mixture of alginate fiber and acetate fiber (acetone method) ... 7 8 Two-component mixture of alginate fiber and triacetate fiber (dichloromethane method) ... 7
9 Standard moisture regain ... 7
10 Precision ... 7
11 Test report ... 7
Annex A (informative) Qualitative identification method for alginate fiber ... 8 Bibliography ... 11
Textiles - Quantitative chemical analysis - Mixtures of
alginate fiber and certain other fibers
1 Scope
This Standard specifies the method to determine the content of alginate fiber in two- component mixture of alginate fiber and certain other fibers after removing non-fibrous material.
This Standard applies to two-component mixture of alginate fiber with cotton, linen, cupro fiber, viscose fiber, modal fiber, lyocell fiber, polyacrylonitrile fiber, polyester, polyamide fiber, spandex, wool, acetate, or triacetate.
NOTE: See Annex A for the qualitative identification method of alginate fiber. 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 2910.1, Textiles -- Quantitative chemical analysis -- Part 1: General principles of testing
GB/T 2910.3, Textiles -- Quantitative chemical analysis -- Part 3: Mixtures of acetate and certain other fibers (method using acetone)
GB/T 2910.10, Textiles -- Quantitative chemical analysis -- Part 10: Mixtures of triacetate or polylactide and certain other fibres (method using dichloromethane) GB/T 2910.11, Textiles -- Quantitative chemical analysis -- Part 11: Mixtures of cellulose and polyester fibres (method using sulfuric acid)
GB/T 2910.12, Textiles -- Quantitative chemical analysis -- Part 12: Mixtures of acrylic, certain modacrylic, certain chlorofibre, certain elastane and certain other fibres (method using dimethylformamide)
GB/T 2910.18, Textiles -- Quantitative chemical analysis -- Part 18: Mixtures of silk and wool or hair (method using sulfuric acid)
3 Two-component mixture of alginate fiber with cotton, linen,
cupro fiber, viscose fiber, modal fiber, lyocell fiber,
polyacrylonitrile fiber, polyester, polyamide fiber or spandex
(sodium hypochlorite method)
3.1 Principle
Use sodium hypochlorite solution to dissolve algae fibers from a mixture of known dry mass. Collect the residue. Wash, dry and weigh. Use the corrected mass to calculate its percentage of the mixed dry mass. The mass percentage of alginate fiber is obtained from the difference.
3.2 Reagents
3.2.1 Use the reagents specified in GB/T 2910.1 as well as 3.2.2 and 3.2.3 of this Standard.
3.2.2 Sodium hypochlorite solution: Add sodium hydroxide to 1 mol/L sodium hypochlorite solution to make its content 5 g/L. This solution can be titrated by iodometric method. Make its concentration between 0.9 mol/L ~ 1.1 mol/L. 3.2.3 Diluted acetic acid solution: Take 5 mL of glacial acetic acid. Use water to dilute to 1000 mL.
3.3 Equipment
3.3.1 Use the equipment specified in GB/T 2910.1 as well as 3.3.2 and 3.3.3 of this Standard.
3.3.2 Erlenmeyer flask with stopper: the capacity is not less than 200 mL. 3.3.3 Constant temperature water bath shaker: it can keep the temperature at (50??2)???. 3.4 Test steps
Follow the general procedures specified in GB/T 2910.1. Then follow the steps below. Put the prepared specimen into the Erlenmeyer flask (3.3.2). Add 100 mL of sodium hypochlorite solution (3.2.2) per gram of specimen to dissolve. After being fully wetted, put it into the constant temperature water bath shaker (3.3.3) at a temperature of (50??2)??C to shake vigorously for 20 min. Use a glass frit core crucible of known dry weight to filter. Use a small amount of (50 ?? 2)??C sodium hypochlorite solution (3.2.2) to wash the residue into a glass crucible. Perform vacuum suction drainage. Then use water to wash and diluted acetic acid solution (3.2.3) to neutralize in turn. Finally use water to wash the residue continuously. After each wash, first use gravity to drain the liquid, and then use vacuum suction to drain the liquid.
Finally, the crucible and residue are dried, cooled, and weighed.
NOTE: If incomplete dissolution occurs during the dissolution process, it is recommended to change the sampling amount of the specimen to 0.5 g.
3.5 Calculation and presentation of results
The calculation and presentation of the results shall be in accordance with the provisions of GB/T 2910.1. The d value of cotton and linen is 1.01. The d value of spandex is 1.02. The d value of cupro ammonia fiber, lyocell fiber and modal fiber is 1.03. The d value of viscose fiber is 1.04. The d value for the rest is 1.00. 4 Two-component mixture of alginate fiber and polyester fiber
(sulfuric acid method)
4.1 Principle
Use 75% (mass fraction) sulfuric acid reagent to dissolve and remove alginate fiber from a mixture of known dry mass. Collect the residues. Wash, dry and weigh. Use the corrected mass to calculate its percentage of dry mass of the mixture. The mass percentage of polyester fiber is obtained from the difference.
4.2 Reagents, instruments, test procedures, calculation and presentation of results The involved reagents, instruments, test procedures, calculation and presentation of results shall be carried out in accordance with GB/T 2910.11. Polyester fibers have a d- value of 1.00.
5 Two-component mixture of alginate fiber and polyacrylonitrile
fiber or spandex (dimethylformamide method)
The involved principles, reagents, instruments, test procedures, calculation and presentation of results shall be carried out in accordance with GB/T 2910.12. The d value of alginate fiber is 1.04.
6 Two-component mixture of alginate fiber and wool (sulfuric
acid method)
6.1 Principle
Use 75% (mass fraction) sulfuric acid reagent to dissolve and remove alginate fiber from a mixture of known dry mass. Collect the residues. Wash, dry and weigh. Use the corrected mass to calculate its percentage of dry mass of the mixture. The mass percentage of wool is obtained from the difference.
6.2 Reagents, instruments, test procedures, calculation and presentation of results The involved reagents, instruments, test procedures, calculation and presentation of results shall be carried out in accordance with GB/T 2910.18. The d value of wool is 0.985.
7 Two-component mixture of alginate fiber and acetate fiber
(acetone method)
The involved principles, reagents, instruments, test procedures, calculation and presentation of results shall be carried out according to GB/T 2910.3. The d value of alginate fiber is 1.00.
8 Two-component mixture of alginate fiber and triacetate fiber
(dichloromethane method)
The involved principles, reagents, instruments, test procedures, calculation and presentation of results shall be carried out according to GB/T 2910.10. The d value of alginate fiber is 1.00.
9 Standard moisture regain
The standard moisture regain of alginate fiber is 20.7%.
10 Precision
For a homogeneous mixture of textile materials, at the 95% confidence level, the confidence limit for the test results of this method does not exceed ??1. 11 Test report
The requirements for the test report shall be in accordance with GB/T 2910.1.

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