GB/T 2910.101-2009 English PDF (GB/T2910.101-2009)

GB/T 2910.101-2009: Textiles -- Quantitative chemical analysis -- Part 101: Mixtures of soybean protein composite fibre and certain other fibers
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GB/T 2910.101-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
W 04
Textiles - Quantitative Chemical Analysis - Part 101:
Mixtures of Soybean Protein Composite Fibre and Certain
Other Fibers
ISSUED ON: JUNE 15, 2009
IMPLEMENTED ON: JANUARY 1, 2010
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the
People’s Republic of China;
Standardization Administration of the People’s Republic of China.
Table of Contents
1 Scope ... 5 
2 Normative References ... 5 
3 Bi-component Mixture of Soybean Protein Composite Fibre and Cotton, Viscose
Fibre, Modal Fiber, Polyacrylonitrile Fiber or Polyester (Method Using Sodium
Hypochlorite/Hydrochloric Acid) ... 5 
4 Bi-component Mixture of Soybean Protein Composite Fibre and Polyacrylonitrile
Fiber and Polyurethane Fibre (Method Using Dimethyl Formamide) ... 7 
5 Mixture of Soybean Protein Composite Fibre and Polyamide (Method Using
Glacial Acetic Acid) ... 8 
6 Bi-component Mixture of Soybean Protein Composite Fibre and Acetate Fibre
(Method Using Acetone) ... 9 
7 Bi-component Mixture of Soybean Protein Composite Fibre and Triacetate Fibre
(Method Using Dichloromethane) ... 10 
8 Bi-component Mixture of Soybean Protein Composite Fibre and Wool, Animal
Fibre or Silk ... 11 
Textiles - Quantitative Chemical Analysis - Part 101:
Mixtures of Soybean Protein Composite Fibre and Certain
Other Fibers
1 Scope
This part of GB/T 2910 specifies chemical analysis methods for bi-component mixture of
soybean protein composite fibre (composited with polyvinyl alcohol). It is applicable to the
bi-component mixture of soybean protein composite fibre (composited with polyvinyl alcohol)
and certain other fibers.
2 Normative References
The following normative documents contain provisions which, through reference in this part
of GB/T 2910, constitute provisions of this part. For dated references, subsequent
amendments to (excluding corrigendum), or revisions of, any of these publications do not
apply. However, parties to agreements based on this part are encouraged to investigate the
possibility of applying the most recent editions of the standards. For undated references, the
latest edition of the normative document referred to 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 Bi-component Mixture of Soybean Protein Composite Fibre and
Cotton, Viscose Fibre, Modal Fiber, Polyacrylonitrile Fiber or
Polyester (Method Using Sodium Hypochlorite/Hydrochloric Acid)
3.1 Principle
Dissolve and remove soybean protein of soybean protein composite fibre from the sample of
known drying mass with 1 mol/L sodium hypochlorite solution, and then dissolve and remove
the remainder (polyvinyl formal) of soybean protein composite fibre with 20% hydrochloric
acid solution, collect, wash, dry and weigh the residues and calculate the corrected mass of
residues in the drying quality of mixture. Obtain the mass fraction of soybean protein
composite fibre from the difference.
3.2 Reagents
The reagents specified in GB/T 2910.1 and 3.2.1, 3.2.2, 3.2.3 and 3.2.4 of this part shall be
used.
3.2.1 1 mol/L sodium hypochlorite solution
Add sodium hydroxide into 1 mol/L sodium hypochlorite to make its content of 5 g/L. This
solution may be titrated with iodometric method to make its concentration of 0.9 mol/L ~1.1
mol/L.
3.2.2 Hydrochloric acid solution (with mass fraction of 20%)
Take 1000mL of concentrated hydrochloric acid (with density of 1.19 g/mL at 20℃) and
slowly add it into 800mL water; cool it to 20℃ and add water into it so as to correct the
density between 1.095 g/mL and 1.100g/mL. The concentration shall be controlled between
19.5 % and 20.5 %.
3.2.3 Dilute acetic acid solution
Dilute 5mL of glacial acetic acid with water to 1000mL.
3.2.4 Dilute ammonia water solution
Dilute 80mL of stronger ammonia solution (with density of 0.880 g/mL) to 1000 mL with
water.
3.3 Apparatuses
The apparatuses specified in GB/T 2910.1 and 3.3.1 and 3.3.2 of this part shall be used.
3.3.1 Conical flask with stopper, of which the capacity is 250mL.
3.3.2 Water bath, keeping the temperature at 20℃±2℃.
3.4 Test procedures
The test shall be carried out according to the general principles specified in GB/T 2910.1 and
the following procedures.
Put the prepared sample into a conical flask, add 100mL of sodium hypochlorite solution
(3.2.1) for each gram of sample, oscillate seriously on the water bath (3.3.2) for 40 min. Filter
it with the sintered glass crucible of known dry weight, wash the residues with a bit of sodium
hypochlorite solution to the glass crucible, drain the liquid by vacuum suction, and then
successively wash with water and neutralize with diluted acetic acid solution (3.2.3), finally,
wash the residues continuously with water and drain the liquid by gravity and vacuum suction
successively. Finally, vacuumize the crucible and residues and drain the liquid.
The test shall be carried out according to the general principles specified in GB/T 2910.1 and
the following procedures.
Place a prepared sample into a conical flask, add 100mL of dimethyl formamide (4.2.1) into
each gram of sample, plug the glass plug, shake the flask to fully moisten the sample,
maintain the flask at 90℃~95℃ for 1h, and shake with hands slightly for five times during
this time. Filter with sintered glass crucible and maintain the residues into the flask.
Add 60mL of dimethyl formamide, maintain 90℃~95℃ for 30min and shake with hands
slightly for twice. Filter the residues into the sintered glass crucible, drain the liquids by
vacuuming, wash the residues with water into the crucible, vacuumize and drain the liquid.
Fill the crucible with hot water and wash the residues twice, drain the liquid by gravity and
vacuumize it. Transfer the residues into the flask, add 160mL of water, maintain 5min under
room temperature and shake severely from time to time. Filter the liquid into the crucible, and
drain the liquid, wash for over three times, filter all the residues into the crucible at the last
time, vacuumize and drain the liquid. Wash the flask with water, vacuumize it and finally dry,
cool and weigh the crucible and residues.
4.5 Result calculation and expression
The result calculation and expression are in accordance with those specified in GB/T 2910.1,
and the d value for soybean protein composite fibre is 1.01.
5 Mixture of Soybean Protein Composite Fibre and Polyamide
(Method Using Glacial Acetic Acid)
5.1 Principle
Dissolve and remove the polyamide fiber from the sample of known drying mass with glacial
acetic acid, collect, wash, dry and weigh the residues; calculate corrected mass in the drying
mass of mixture. Obtain the mass fraction of polyamide fiber from the difference.
5.2 Reagents
The reagents specified in GB/T 2910.1 and 5.2.1 and 5.2.2 of this part are used.
5.2.1 Glacial acetic acid
Warning: This reagent is highly corrosive; thus, the user shall take perfect protection
measures.
5.2.2 Dilute ammonia water solution
Take 80mL of stronger ammonia solution (with density of 0.880 g/mL) and dilute it to 1,000
mL with water.
5.3 Apparatuses
The apparatuses specified in GB/T 2910.1 and 5.3.1 and 5.3.2 of this part shall be used.
5.3.1 Conical flask with stopper, of which the capacity is not less than 200 mL.
5.3.2 Water bath: capable of keeping the water boiling.
5.4 Test procedures
The test shall be carried out according to the general principles specified in GB/T 2910.1 and
the following procedures.
Place a prepared sample into a conical flask with stopper, add 100mL of glacial acetic acid
(5.2.1) which is preheated nearly 100℃ into each gram of sample, keep for 20min in boiled
water bath and shake from time to time. Filter it with sintered glass crucible of known mass
when the polyamide fiber is fully dissolved, wash the residues with glacial acetic acid of the
same temperature, then wash with water of the same temperature, neutralize with dilute
ammonia water solution (5.2.2), then wash with water until the residues are neutral when
inspected with an indicator. After each washing, vacuumize it and drain the liquid and dry,
cool and weigh the residues.
5.5 Result calculation and expression
The result calculation and expression are in accordance with those specified in GB/T 2910.1,
and the d value for soybean protein composite fibre is 1.02.
6 Bi-component Mixture of Soybean Protein Composite Fibre and
Acetate Fibre (Method Using Acetone)
6.1 Principle
Dissolve and remove the acetate fibre from the sample of known drying mass with acetone,
collect, wash, dry and weigh the residues; calculate corrected mass in the drying mass of
mixture. Obtain the mass fraction of acetate fibre from the difference.
6.2 Reagents
The reagents specified in GB/T 2910.1 and 6.2.1 of this part are used.
6.2.1 Acetone with the distillation range of 55℃~57℃.
6.3 Apparatus
7.3.1 Conical flask with stopper, of which the capacity is not less than 200mL.
7.4 Test procedures
The test shall be carried out according to the general principles specified in GB/T 2910.1 and
the following procedures.
Put the prepared sample into a conical flask, add 100mL of dichloromethane (7.2.1) for each
gram of sample, shake the flask to fully wet, and then place for 30min and shake once every
other 10 min. Filter the liquid with the sintered glass crucible, add 60mL of dichloromethane
to the residues in the conical flask, shake by hands and filter it into the crucible. Wash the
residues with a bit of dichloromethane to the crucible and drain the liquid by vacuum suction.
Fill the crucible with dichloromethane and drain the liquid by gravity; finally, drain the liquid
by vacuum suction. Wash with hot water and dry, cool and weigh the crucible and residual
fibre.
7.5 Result calculation and expression
The result calculation and expression are in accordance with those specified in GB/T 2910.1,
and the d value for soybean protein composite fibre is 1.00.
8 Bi-component Mixture of Soybean Protein Composite Fibre and
Wool, Animal Fibre or Silk
8.1 Method using sodium hypochlorite
8.1.1 Principle
Dissolve and remove soybean protein component in wool, animal fibre or silk and soybean
protein composite fibre from the sample of known drying mass with 1mol/L sodium
hypochlorite solution, collect the residues (polyvinyl formal), wash, dry, and weigh them;
calculate the mass fraction of soybean protein composite fibre accounting for mixture drying
mass according to the content of soybean protein. Obtain the mass fraction of wool, animal
fibre or silk according to the difference.
8.1.2 Reagents
The reagents specified in GB/T 2910.1 and 8.1.2.1 and 8.1.2.2 of this part shall be used.
8.1.2.1 1mol/L sodium hypochlorite solution
Add sodium hydroxide into 1mol/L sodium hypochlorite to make its content be 5g/L. This
solution may be titrated with iodometric method to make its concentration be
0.9mol/L~1.1mol/L.
 …………………………..…………………… (3)
For unbleached soybean protein composite fibre, the protein content is 22.48% and K value is
1.29; for bleached soybean protein composite fibre, the protein content is 21.56% and K value
is 1.27.
8.2 Method using sodium hydroxide
8.2.1 Principle
Dissolve and remove the wool, animal fibre or silk from the sample of known drying mass
with 2.5% sodium hydroxide, collect, wash, dry and weigh the residues; calculate its mass
fraction accounting for the mixture drying mass with corrected mass, and obtain the mass
fraction of wool, animal fibre silk according to the difference.
8.2.2 Reagents
The reagents specified in GB/T 2910.1 and 8.2.2.1 and 8.2.2.2 of this part shall be used.
8.2.2.1 Sodium hydroxide solution (with mass fraction of 2.5%)
8.2.2.2 Dilute acetic acid solution: dilute 5mL of glacial acetic acid with water to 1000mL.
8.2.3 Apparatuses
The apparatuses specified in GB/T 2910.1 and 8.2.3.1 and 8.2.3.2 of this part shall be used.
8.2.3.1 Conical flask with stopper, of which the capacity is not less than 200mL.
8.2.3.2 Water bath: capable of keeping the water boiling.
8.2.4 Test procedures
The test shall be carried out according to the general principles specified in GB/T 2910.1 and
the following procedures.
Put the prepared sample into a conical flask, add 100mL of 2.5% sodium hydroxide solution
(8.2.2.1) preheated to nearly 100℃ for each gram of sample, keep the conical flask in boiling
water bath for 20min and shake it now and then to fully dissolve the animal fibres like wool;
and then filter with sintered glass crucible of known mass, wash the residues with sodium
hydroxide solution at the same temperature and concentration for several times, wash with
40℃~50℃ water and neutralize with dilute acetic acid solution (8.2.2.2) successively, and
then wash with water to neutrality (inspected with indicator); the liquid must be drained by
vacuum suction after each washing. Finally, dry, cool and weigh the crucible and residues.
8.2.5 Result calculation and expression
The result calculation and expression are in accordance with those specified in GB/T 2910.1.
The d values for unbleached and bleached soybean protein composite fibres are 1.07 and 1.12,
respectively.
8.3 Method using nitric acid
8.3.1 Principle
Dissolve and remove the soybean protein composite fibre from the sample of known drying
mass with nitric acid solution, collect, wash, dry and weigh the residues; calculate its mass
fraction accounting for the mixture drying mass with corrected mass, and obtain the mass
fraction of wool, animal fibre silk according to the difference.
This method is not applicable to bi-component mixture of soybean protein composite fibre
and silk.
8.3.2 Reagents
The reagents specified in GB/T 2910.1 and 8.3.2.1 and 8.3.2.2 of this part shall be used.
8.3.2.1 5:1 (V/V) nitric acid solution
Add 500mL of concentrated nitric acid (with density at 20...