GB/T 2910.16-2024 Textiles - Quantitative chemical analysis - Part 16: Mixtures of polypropylene fibres with certain other fibres (method using xylene)
1 Scope
This document specifies a method, using xylene, to determine the mass percentage of polypropylene, after removal of non-fibrous matter, in textiles made of binary mixtures of:
——Polypropylene fibers, with
——Wool, animal hair, silk, cotton, viscose, cupro, modal, lyocell, acetate, triacetate, polyamide, polyester, acrylic, glass fibers, elastomultiester, melamine, and polyacrylate.
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 polypropylene fibre is dissolved from a known dry mass of the mixture with boiling xylene. The residue is collected, washed, dried and weighed. Its corrected mass is expressed as a percentage of the dry mass of the mixture. The percentage of polypropylene is found by the difference.
5 Reagents
Use the reagents described in GB/T 2910.1 together with that given in 5.1.
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5.1 Xylene, boiling range from 136℃~145℃.
Safety precautions: the harmful effects of this reagent shall be borne in mind, full precautions shall be taken during use, and attention shall be paid to the correct disposal of hazardous waste.
6 Apparatus
Use the apparatus described in GB/T 2910.1 together with those given in 6.1, 6.2 and 6.3.
6.1 Round bottom flasks, of minimum capacity 200mL, glass stoppered.
6.2 Reflux condenser, suitable for liquids of high boiling point, fitting the round bottom flasks.
6.3 Heating mantle device, suitable for boiling point of xylene (5.1) and for the round bottom flask (6.1).
7 Test procedure
Follow the general procedure given in GB/T 2910.1, and then proceed as follows.
Preheat the filter crucible through which the xylene is to be filtered in the oven at 105℃. To the specimen contained in the round bottom flask (6.1), add 100mL of the xylene per gram of specimen (5.1). Attach the condenser (6.2), put it in the heating mantle device (6.3) and boil the contents for 3min. Alternatively, hot extraction apparatus, (e.g. as described in GB/T 2910.21) using the appropriate procedures, giving identical results, may be used. Filter through a filter crucible of known dry weight.
Repeat the above dissolution and filtration operations twice [50mL xylene each time (5.1)], and wash the residue remaining in the flask successively with 30mL of boiling xylene twice. After the flask and the residue are cooled sufficiently, wash the residue remaining in the flask with 75mL of the light petroleum twice (during the second wash with light petroleum, filter the residue through the filter crucible). Do not apply suction until the washing liquor has drained under gravity.
Finally, dry the crucible and residue, then cool and weigh them.
8 Calculation and expression of results
Calculation and expression of results shall comply with GB/T 2910.1.
The value of d is 1.00 except for melamine and polyacrylate, for which d is 1.01.
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
Bibliography
