GB/T 42695-2023 Textiles - Quantitative chemical analysis - Mixtures of kapok with certain other fibers
WARNING - Persons using this document shall be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health measures and to ensure compliance with any national regulatory conditions.
1 Scope
This document specifies the method for determining fiber content in two-component mixtures of kapok with certain other fibers by chemical analysis method after removal of non-fibrous substances from the kapok.
This document is applicable to two-component mixtures of kapok with certain natural protein fibers (silk, sheep wool, other animal hair fibers), certain natural cellulose fibers (cotton, flax, ramie), certain regenerated cellulose fibers (viscose, modal fibers, Lyocell fibers, copper ammonia fibers), polyester fibers, polypropylene fibers, polyethylene fibers, polyamide fibers, acrylic fibers, certain modacrylic fibers, polyurethane elastic fibers, polyvinyl alcohol fibers, acetate fibers or triacetate fibers.
This document is not applicable to mixtures in which cotton fibers or regenerated cellulose have been severely chemically degraded, nor to mixtures in which durable finishing agents or reactive dyes are present in the kapok which cannot be completely removed, rendering the kapok incompletely soluble.
Note: See Annex A for the qualitative identification method of kapok.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 2910.4 Textiles - Quantitative chemical analysis - Part 4: Mixtures of certain protein fibers with certain other fibers (method using hypochlorite)
GB/T 2910.7 Textiles - Quantitative chemical analysis - Part 7: Mixtures of polyamide and certain other fibers (method using formic acid)
GB/T 2910.11 Textiles - Quantitative chemical analysis - Part 11: Mixtures of cellulose and polyester fibers (method using sulfuric acid)
GB/T 2910.12 Textiles - Quantitative chemical analysis - Part 12: Mixtures of acrylic, certain modacrylic, certain chlorofibers, certain elastanes and certain other fibers (method using dimethylformamide)
GB/T 38015-2019 Textiles - Quantitative chemical analysis - Mixtures of elastane and certain other fibers
FZ/T 01132-2016 Textiles - Quantitative chemical analysis - Mixtures of vinylal fiber and certain other fibers
3 Terms and definitions
No terms and definitions are listed in this document.
4 Two-component mixtures of kapok with certain natural protein fibers (silk, sheep wool, other animal hair fibers) (hypochlorite method)
The principles, reagents, instruments, test steps, calculation and expression of results shall adhere to those outlined in GB/T 2910.4, and the correction coefficient for the mass change of kapok (d-value) is 1.02.
5 Two-component mixtures of kapok with certain natural cellulose fibers (cotton, flax, ramie) (formic acid/zinc chloride method)
5.1 Principle
Dissolve and remove the kapok from the mixture with a known dry mass using formic acid/zinc chloride reagent. Collect the residue, wash it, dry it, and weigh it. Then, calculate its percentage in the dry mass of the mixture based on the corrected mass. Then, obtain the mass fraction of the second component from the difference.
5.2 Reagents
5.2.1 Reagents specified in GB/T 2910.1 shall be used.
5.2.2 Formic acid/zinc chloride solution: Prepare 20g of anhydrous zinc chloride (mass fraction >98%) and 68g of anhydrous formic acid, and then diluted them to 100g with water.
5.2.3 Dilute ammonia solution: Take 20mL of concentrated ammonia (density: ρ=0.880g/mL) and dilute it to 1L with water.
5.3 Apparatus
5.3.1 Apparatus specified in GB/T 2910.1 shall be used.
5.3.2 Stoppered conical flask: With a capacity not less than 200mL.
5.3.3 Constant temperature water bath: Capable of maintaining the temperature at (70±2)℃.
5.4 Test procedure
Follow the general procedure given in GB/T 2910.1, and then proceed as follows.
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Two-component mixtures of kapok with certain natural protein fibers (silk, sheep wool, other animal hair fibers) (hypochlorite method)
5 Two-component mixtures of kapok with certain natural cellulose fibers (cotton, flax, ramie) (formic acid/zinc chloride method)
6 Two-component mixtures of kapok with certain regenerated cellulose fibers (viscose, modal fibers, Lyocell fibers, copper ammonia fibers) (sodium hypochlorite method)
7 Two-component mixtures of kapok with polyester fibers, polypropylene fibers and polyethylene fibers (sulfuric acid method)
8 Two-component mixtures of kapok with polyamide fibers (formic acid method)
9 Two-component mixtures of kapok with acrylic fibers, certain modacrylic fibers or polyurethane elastic fibers (dimethylformamide method)
10 Two-component mixtures of kapok with polyvinyl alcohol fibers (hydrochloric acid method)
11 Mixtures of kapok with acetate fibers or triacetate fibers (75% formic acid method)
12 Precision
13 Test report
Annex A (Informative) Qualitative identification method of kapok
Bibliography
