GB/T 41418-2022 PDF English
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Textiles - Quantitative chemical analysis - Mixtures of meta-aramid and para-aramid fibres (method using dimethylacetamide and lithium chloride)
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GB/T 41418-2022: Textiles - Quantitative chemical analysis - Mixtures of meta-aramid and para-aramid fibres (method using dimethylacetamide and lithium chloride)
---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/GBT41418-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
CCS W 04
Textiles - Quantitative chemical analysis - Mixtures of meta-
aramid and para-aramid fibres
(Method using dimethylacetamide and lithium chloride)
ISSUED ON: APRIL 15, 2022
IMPLEMENTED ON: NOVEMBER 01, 2022
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 ... 5
6 Instruments and equipment ... 5
7 Test procedures ... 5
8 Calculation and expression of results ... 6
9 Precision ... 6
10 Test report ... 6
Appendix A (Informative) Identification method of meta-aramid and para-aramid fibres
... 7
References ... 11
Textiles - Quantitative chemical analysis - Mixtures of meta-
aramid and para-aramid fibres (method using
dimethylacetamide and lithium chloride)
1 Scope
This document describes the determination of fibre content in bicomponent mixtures of
meta-aramid and para-aramid fibres after removal of non-fibrous materials by the
method using lithium chloride and dimethylacetamide.
This document applies to bicomponent mixtures of meta-aramid and para-aramid fibres.
Note: See Appendix A for the identification method of fibres in the mixture of meta-
aramid and para-aramid fibres.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. 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
3 Terms and definitions
No terms and definitions need to be defined in this document.
4 Principle
Use lithium chloride/dimethylacetamide solution to dissolve and remove the meta-
aramid fibres 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 percentage content of meta-aramid fibres from the difference.
5 Reagents
Warning: Lithium chloride/dimethylacetamide solution is harmful to human body,
therefore, thorough protection measures shall be taken when using it, the test shall
be carried out in a fume hood, and attention shall be paid to avoid dripping
reagents on the heating device during use.
5.1 Use the reagents specified in GB/T 2910.1.
5.2 Lithium chloride/dimethylacetamide solution: Take 2.0 g of anhydrous lithium
chloride (mass fraction >98%); add 104 mL of dimethylacetamide solution (density at
0.940 g/mL ~ 0.944 g/mL at 20 °C); heat and stir to completely dissolve the lithium
chloride.
Note: This reagent needs to be prepared and used immediately; the boiling point is
about 166 °C.
6 Instruments and equipment
6.1 Use the instruments and equipment specified in GB/T 2910.1.
6.2 Conical flask with stopper: capacity not less than 300 mL.
6.3 Reflux condenser: used for condensation of lithium chloride/dimethylacetamide
solution, connected to a conical flask.
6.4 Heating device: such as universal electric furnace (with asbestos mesh).
7 Test procedures
7.1 Carry out in accordance with the sample preparation methods and general
procedures specified in GB/T 2910.1.
7.2 Put the prepared sample into the conical flask (6.2); add 200 mL of lithium
chloride/dimethylacetamide solution (5.2) to every gram of sample; connect the reflux
condenser (6.3); use the heating device (6.4) to boil for 20 min (keep boiling during the
period); filter the residue to a known dry weight and preheat the glass sand core crucible
in an oven above 60 °C for at least 10 min; vacuum draw and drain.
7.3 Transfer the residue to the original conical flask; add 100 mL of lithium
chloride/dimethylacetamide solution (preheated in a constant temperature water bath
above 80 °C); use a glass rod to stir for not less than 1 min; filter it into the original
glass sand core crucible; drain the liquid under the action of gravity and then vacuum
to drain; repeat the operation once.
7.4 Use boiling water to wash twice in a row (it is regarded as once for filling the sand
core crucible); then, use laboratory room temperature water to wash. For each washing,
drain the liquid first by gravity and then by vacuum suction; dry the crucible and residue,
cool and weigh.
8 Calculation and expression of results
The calculation and expression of the results shall be in accordance with the provisions
of GB/T 2910.1.
The mass change correction coefficient d of the para-aramid fibre is 1.00.
9 Precision
For a homogeneous mixture of textile materials, at the 95% confidence level, the
confidence limit of the test results of this document shall not exceed ±1%.
10 Test report
The test report shall include the following:
a) method of this document adopted;
b) sample description;
c) test results of all components of the mixture;
d) details of the special pretreatment to remove slurry or finishing agent, if adopted;
e) Note 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 fibre loss in
pretreatment;
4) percentage including the conventional moisture regain and the non-fibrous
material removal.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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