GB/T 22875-2018 English PDF (GBT22875-2018)

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GB/T 22875-2018: Super-absorbent polymer for sanitary towel and diapers
GB/T 22875-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85.080
Y 39
Replacing GB/T 22875-2008, GB/T 22905-2008
Super-absorbent polymer for
sanitary towel and diapers
ISSUED ON. JUNE 07, 2018
IMPLEMENTED ON. JANUARY 01, 2019
Issued by. State Market Regulatory Administration;
General Administration of Quality Supervision, Inspection and
Quarantine.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Product classification ... 5 
4 Requirements ... 6 
5 Test methods ... 6 
6 Inspection rules ... 8 
7 Marking, packaging, transportation, storage ... 8 
Appendix A (Normative) Determination of residual monomers (acrylic acid) .. 10 
Appendix B (Normative) Determination of volatile content ... 13 
Appendix C (Normative) Determination of pH ... 14 
Appendix D (Normative) Determination of distribution of particle size ... 16 
Appendix E (Normative) Determination of density ... 18 
Appendix F (Normative) Determination of yellowing value ... 20 
Appendix G (Normative) Determination of absorption speed ... 22 
Appendix H (Normative) Determination of absorption amount and water
retention ... 23 
Appendix I (Normative) Determination of absorption amount under pressure 26 
Appendix J (Normative) Determination of extractable content ... 29 
Appendix K (Normative) Formulation and physical properties of standard
synthetic test solutions ... 33
Super-absorbent polymer for
sanitary towel and diapers
1 Scope
This standard specifies the product classification, requirements, test methods,
inspection rules and marking, packaging, transportation and storage of
polyacrylate super-absorbent polymers for sanitary towels and diapers.
This standard applies to polyacrylate super-absorbent polymers which are used
by all kinds of paper diapers (sheets, pads) and sanitary towels (pads). The
super-absorbent polymers which are used by other disposable sanitary
products may make reference to this standard.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 7974 Paper, board and pulps - Measurement of diffuse blue
reflectance factor - D65 brightness (Diff/Geometry, outdoor daylight
conditions)
3 Product classification
The super-absorbent polymer is divided into the super-absorbent polymer for
paper diapers (sheets, pads) and the super-absorbent polymer for the sanitary
towels (pads) in accordance with the use of the product. The super-absorbent
polymer for paper diapers (sheets, pads) is divided into the super-absorbent
polymer for baby diaper (sheets, pad) and the super-absorbent polymer for
adult diapers (sheets, pads) in accordance with the objective of use.
6 Inspection rules
6.1 Provisions on inspection batch
The products which are produced by the same raw material, the same process
and the same period of time form a batch, the amount of each batch does not
exceed 500 t.
6.2 Sampling methods
Take samples evenly from the same batch and not less than 3 packaging bags,
the sample amount shall be 1 kg.
6.3 Rules for decision
When the inspection product meets the requirements of this standard or
contract, it is judged to be qualified; when any of the inspection items fails, it is
judged to be unqualified.
6.4 Quality assurance
The manufacturer shall ensure that the product quality meets the requirements
of this standard or contract. The product can only be exit-factory after being
inspected qualified and accompanied with quality certificate mark.
7 Marking, packaging, transportation, storage
7.1 Sales mark and packaging
7.1.1 The product sales package shall be marked with the following contents.
a) Product name, implemented standard number, trademark, product type;
b) Name, address and contact information of the enterprise;
c) Date of manufacture and shelf life, or production lot number and limited
period of use;
d) Main raw materials;
e) Transportation and storage conditions.
7.1.2 The product shall be packed in a packaging bag with a lined plastic film.
The packaging bag shall have sufficient strength, to ensure that it will not break
or fall off during use. The various identification information on the sales package
shall be clear and not easy to fade.
Appendix A
(Normative)
Determination of residual monomers (acrylic acid)
A.1 Principle
The sample is extracted by physiological saline, the residual monosodium
acrylate and acrylic acid in the sample are transferred to the solution. After 1
hour, the solution is filtered, the filtrate is taken and subjected to high
performance liquid chromatography to measure the content of acrylic acid, the
result is based on the content of acrylic acid.
A.2 Reagents and materials
Unless otherwise specified, only chromatographic reagents are used.
A.2.1 Water, GB/T 6682, level I.
A.2.2 Normal saline, concentration 0.9%. WEIGH 9.00 g (accurate to 0.01 g) of
sodium chloride (analytical grade) in a beaker, DISSOLVE and TRANSFER it
into a 1 L volumetric flask, USE water to dilute it to the mark, SHAKE it uniformly.
A.2.3 Concentrated phosphoric acid, c(H3PO4) = 85% (mass ratio),
chromatographic grade or higher.
A.2.4 Aqueous phosphoric acid solution, c(H3PO4) = 0.1% (mass ratio). WEIGH
1.0 g of concentrated phosphoric acid in a 1 L volumetric flask, USE water to
dilute it to the mark, SHAKE it uniformly.
A.2.5 Acetonitrile, chromatographic grade or higher.
A.2.6 Acrylic acid, the purity is greater than 99.5%.
A.2.7 Acrylic standard stock solution (1000 mg/L). WEIGH 0.1000 g of acrylic
acid (A.2.6), accurate to 0.0001 g, PUT it into a 100 mL volumetric flask, USE
water to dilute it to 100 mL.
A.2.8 Acrylic standard intermediate solution (100 mg/L). PIPETTE 10 mL of
acrylic acid standard stock solution (A.2.7) into a 100 mL volumetric flask, USE
water to dilute it to 100 mL.
A.3 Instruments and equipment
A.3.1 High performance liquid chromatography.
Appendix B
(Normative)
Determination of volatile content
B.1 Instrument and equipment
B.1.1 Oven, it can keep the temperature at 105 °C ± 2 °C.
B.1.2 Balance, the sensitivity is 0.001 g.
B.1.3 Dryer, with active desiccant (e.g., silica gel).
B.1.4 Specimen container, for the transfer and weighing of specimen. The
container is made of a lightweight material that is water-repellent and resistant
to changes under experimental conditions. The inner diameter of the container
is 55 mm ± 5 mm.
B.2 Determination step
WEIGH approximately 4.0 g of the specimen, accurate to 0.001 g, LOAD it into
a specimen container (B.1.4) which has reached to constant weight. PLACE
the container which contains the specimen in an oven (B.1.1) at a temperature
of 105 °C, OPEN the container lid, DRY it for 3 hours. After 3 hours, OPEN the
oven, COVER the container lid in the oven, then PLACE the container into the
dryer (B.1.3) for 30 minutes, WEIGH the mass of the container and the
specimen. PERFORM two parallel determinations simultaneously.
B.3 Calculation of results
The volatile content is calculated in accordance with formula (B.1).
Where.
M ...