GB/T 42695-2023 PDF English
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Textiles - Quantitative chemical analysis - Mixtures of kapok with certain other fibers
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GB/T 42695-2023: Textiles - Quantitative chemical analysis - Mixtures of kapok with certain other fibers
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT42695-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Textiles - Quantitative chemical analysis - Mixtures of kapok
with certain other fibers
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 01, 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 ... 5
4 Two-component mixtures of kapok and certain natural protein fibers (silk, sheep wool,
other animal hair fibers) (method using hypochlorite) ... 5
5 Two-component mixtures of kapok and certain native cellulose fibers (cotton, flax,
ramie) (method using formic acid/zinc chloride) ... 5
6 Two-component mixtures of kapok and certain regenerated cellulose fibers (viscose
fiber, modal fiber, lyocell fiber, copper ammonia fiber) (method using sodium
hypochlorite) ... 7
7 Two-component mixtures of kapok and polyester fiber, polypropylene fiber,
polyethylene fiber (method using sulfuric acid) ... 8
8 Two-component mixtures of kapok and polyamide fiber (method using formic acid)
... 8
9 Two-component mixtures of kapok and polyacrylonitrile fibers, certain modified
acrylic fibers or polyurethane elastic fibers (method using dimethylformamide) ... 8
10 Two-component mixtures of kapok and polyvinyl alcohol fiber (method using
hydrochloric acid) ... 9
11 Mixtures of kapok and acetate fiber or triacetate fiber (method using 75% formic
acid) ... 9
12 Precision ... 9
13 Test report ... 9
Appendix A (Informative) Qualitative identification method of kapok ... 11
References ... 14
Textiles - Quantitative chemical analysis - Mixtures of kapok
with certain other fibers
Warning – The personnel who uses this document shall have hands-on experience
in formal laboratory work. As this document does not address all possible safety
issues, the user is responsible for taking appropriate safety and health measures
and ensuring compliance with the relevant national regulations.
1 Scope
This document describes a method of chemical analysis for the determination of the
fiber content of two-component mixtures of kapok with certain other fibers after
removal of non-fibrous matter.
This document applies to two-component mixtures of kapok and certain natural protein
fibers (silk, sheep wool, other animal hair fibers), certain native cellulose fibers (cotton,
flax, ramie), certain regenerated cellulose fibers (viscose fiber, modal fiber, lyocell fiber,
copper ammonia fiber), polyester fiber, polypropylene fiber, polyethylene fiber,
polyamide fiber, polyacrylonitrile fiber, certain modified acrylic fibers, polyurethane
elastic fiber, polyvinyl alcohol fiber, acetate fiber or triacetate.
This document does not apply to mixtures where cotton fibers or regenerated cellulose
have been subjected to severe chemical degradation, nor does it apply to mixtures in
which there are durable finishing agents or reactive dyes that cannot be completely
removed in the kapok, making them insoluble.
Note: See Appendix A for the qualitative identification method of kapok.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
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 and certain other fibers (method using hypochlorite)
5.2.1 Reagents specified in GB/T 2910.1.
5.2.2 Formic acid/zinc chloride solution: Add 20 g of anhydrous zinc chloride (mass
fraction >98%) and 68 g of anhydrous formic acid; add water to 100 g.
5.2.3 Dilute ammonia solution: Take 20 mL concentrated ammonia water (density ρ =
0.880 g/mL) and use water to dilute it to 1 L.
5.3 Apparatus
5.3.1 Apparatus specified in GB/T 2910.1.
5.3.2 Erlenmeyer flask with stopper: capacity not less than 200 mL.
5.3.3 Constant temperature water bath device: capable of maintaining the temperature
at (70±2) °C.
5.4 Test procedures
Follow the general procedures specified in GB/T 2910.1, and then follow the steps
below.
Put the prepared sample into an Erlenmeyer flask with stopper (5.3.2) filled with formic
acid/zinc chloride solution (5.2.2) which has been preheated to (70±2) °C; add 100 mL
of formic acid/zinc chloride solution (5.2.2) to each gram of sample; tightly cap the
bottle stopper; shake the flask, to fully wet the sample; then, place it in the constant
temperature water bath (5.3.3) at (70±2) °C for 20 min; shake it once after 10 minutes,
and shake it again after 20 minutes when taking it out.
Use a glass sand core crucible with known dry weight to filter; use 20 mL of formic
acid/zinc chloride solution (5.2.2) at the same temperature and concentration to wash
the residue 3 times; then, use water at the same temperature to wash 4 ~ 5 times; then,
use cold water to wash, and use dilute ammonia solution (5.2.3) to neutralize; then, use
water to wash the residue continuously. After each wash, first drain by gravity, and then
drain by vacuum. Finally, dry, cool and weigh.
5.5 Calculations and presentation of results
The calculation and presentation of the results shall be carried out according to the
provisions of GB/T 2910.1. The d value of cotton is 1.03, the d value of flax is 1.07,
and the d value of ramie is 1.00.
6 Two-component mixtures of kapok and certain regenerated
cellulose fibers (viscose fiber, modal fiber, lyocell fiber, copper
ammonia fiber) (method using sodium hypochlorite)
6.1 Principle
Use sodium hypochlorite solution to dissolve and remove the kapok from the mixture
of known dry mass; collect the residue; wash, dry and weigh; use the corrected mass to
calculate the percentage of the dry mass of the mixture. Obtain the second component
mass fraction from the difference.
6.2 Reagents
6.2.1 Reagents specified in GB/T 2910.1.
6.2.2 Sodium hypochlorite solution: Add sodium hydroxide (6.2.4) to 1 mol/L sodium
hypochlorite solution, making the content 5 g/L. This solution can be titrated by
iodometry, making its concentration at 0.9 mol/L ~ 1.1 mol/L.
6.2.3 Dilute acetic acid solution: Add water to dilute 5 mL of glacial acetic acid
(distillation range 117 °C ~ 119 °C) to 1 L.
6.2.4 Sodium hydroxide.
6.3 Apparatus
6.3.1 Apparatus specified in GB/T 2910.1.
6.3.2 Erlenmeyer flask with stopper: capacity not less than 200 mL.
6.3.3 Constant temperature water bath device: capable of maintaining the temperature
at (60±2) °C.
6.4 Test steps
Follow the general procedures specified in GB/T 2910.1, and then follow the steps
below.
Put the prepared sample into the Erlenmeyer flask with stopper (6.3.2); add 100 mL
sodium hypochlorite solution (6.2.2) to each gram of sample; plug the glass stopper;
shake the flask, to fully wet the sample; place it in the constant temperature water bath
(6.3.3) at (60 ± 2) °C for 45 min; shake once every 15 min, and take it out after 45 min
and shake again.
10 Two-component mixtures of kapok and polyvinyl alcohol
fiber (method using hydrochloric acid)
The involved principle, reagents, apparatus, test procedure, calculation and presentation
of results shall be carried out according to the method using hydrochloric acid in FZ/T
01132-2016, and the d value of kapok is 1.01.
11 Mixtures of kapok and acetate fiber or triacetate fiber
(method using 75% formic acid)
The involved principle, reagents, apparatus, test procedure, calculation and presentation
of results shall be carried out in accordance with 10.1 of GB/T 38015-2019, and the d
value of kapok is 1.01.
12 Precision
For a homogeneous mixture of textile materials, at the 95% confidence level, the
confidence limits of the test results of the method using formic acid/zinc chloride do
not exceed ±2%, and the confidence limits of the test results of other methods do not
exceed ±1%.
13 Test report
The test report shall include the following.
a) method in this document adopted.
b) the measured results of all components or a single component of the mixture.
d) details of the special pretreatment used to remove sizing agent or finishing agent,
if adopted;
d) each single value and its average value, accurate to 0.1%.
e) notes that the above results are based on:
1) net dry mass percentage;
2) percentage combined with the conventional moisture regain;
3) percentage including the conventional moisture regain and the fiber loss in
pretreatment;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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