GB/T 2910.9-2024 Textiles - Quantitative chemical analysis - Part 9: Mixtures of acetate with certain other fibres (method using benzyl alcohol)
1 Scope
This document specifies a method, using benzyl alcohol, to determine the mass percentage of acetate, after removal of non-fibrous matter, in textiles made of mixtures of
——Acetate;
——Triacetate, polypropylene, elastolefin, melamine, polypropylene/polyamide bicomponent and polyacrylate fibres.
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 2910.1-2009, ISO 1833-1:2006, IDT)
3 Terms and definitions
No terms and definitions are listed in this document.
4 Principle
The acetate fibre is dissolved out from a known dry mass of the mixture, with benzyl alcohol. The residue is collected, washed, dried and weighed; its corrected mass is expressed as a percentage of the dry mass of mixture. The percentage of acetate is found by the difference.
5 Reagents
Safety precautions: Benzyl alcohol is harmful to human body and shall be used with proper precautions.
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Use the reagents described in GB/T 2910.1 together with those given in 5.1 and 5.2 hereof, and all of them shall be of analytical grade.
5.1 Benzyl alcohol.
5.2 Ethanol.
6 Apparatus
Use the apparatus described in GB/T 2910.1 together with those given in 6.1 and 6.2 hereof.
6.1 Conical flask with a minimum capacity of 200mL, glass-stoppered.
6.2 Thermostatic waterbath oscillator suitable for maintaining the temperature of the flask at (52±2)℃.
Note: The oscillation frequency is recommended to be 50 times/min to 100 times/min, adjustable.
7 Test procedure
Follow the general procedure given in GB/T 2910.1, and then proceed as follows.
To the specimen contained in the conical flask, add 100mL of benzyl alcohol (5.1) per gram of specimen. Insert the stopper, secure the flask to the stopper so that the flask is immersed in the thermostatic waterbath oscillator, kept at a temperature of (52±2)℃. Shake the flask for (20±1)min at this temperature. Filter the contents of the flask through the weighed sand-core crucible.
Replace the residue in the flask by means of forceps, add to the flask about 100mL of benzyl alcohol (5.1) and shake as before at a temperature of (52±2)℃ for (20±1)min. Filter the contents of the flask through the same sand-core crucible.
Repeat the cycle a third time with a third 100mL portion of benzyl alcohol (5.1). Pour the liquid and the residue into the same sand-core crucible; wash any insoluble fibres from the flask into the crucible with an extra quantity of benzyl alcohol at a temperature of (52±2)℃. Drain the crucible using suction.
Transfer the fibres into a conical flask, rinse with ethanol (5.2) and, after manual shaking, decant through the same sand-core crucible.
Repeat this rinsing operation three times. Transfer the residue into the same sand-core crucible.
Foreword I
Introduction V
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Test procedure
8 Calculation and expression of results
9 Precision
