GB/T 22875-2018 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 22875-2018 | English | 150 |
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Super-absorbent polymer for sanitary towel and diapers
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| GB/T 22875-2008 | English | 519 |
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Superabsorbent polymer for sanitary towel
| Obsolete |
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GB/T 22875-2018: Super-absorbent polymer for sanitary towel and diapers---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/GBT22875-2018
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
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 22875-2008 “Super-absorbent polymer for
sanitary towel” and GB/T 22905-2008 “Super-absorbent polymer for diaper”.
As compared with GB/T 22875-2008 and GB/T 22905-2008, the main changes
of this standard are as follows.
- INTEGRATE the two standard contents of GB/T 22875-2008 and GB/T
22905-2008, MODIFY the standard name;
- ADD the product classification;
- ADJUST the index requirements and determination methods of residual
monomer (acrylic acid);
- ADJUST the method for determining the volatile content;
- ADJUST the absorption speed indicator requirements;
- ADJUST the size of the pressure absorption test device;
- ADD the yellowing value, extractables content index and determination
method;
- ADD the sampling requirements.
Please note that some of the contents of this document may involve patents.
The issuing organization of this document is not responsible for identifying
these patents.
This standard was proposed by the China National Light Industry Council.
This standard shall be under the jurisdiction of the National Paper Industry
Standardization Technical Committee (SAC/TC 141).
Drafting organizations of this standard. China Pulp and Paper Research
Institute, Zhejiang Satellite New Material Technology Co., Ltd., Yixing Dansen
Technology Co., Ltd., Sumitomo Refined Trade (Shanghai) Co., Ltd., Nishao
Chemical (Zhangjiagang) Co., Ltd., Banglida (Fujian) New Materials Co., Ltd.,
Sandaya Fine Chemicals (Nantong) Co., Ltd., Yangzi Petrochemical-BASF Co.,
Ltd., LG Chemical (China) Investment Co., Ltd., Wanhua Chemical Group Co.,
Ltd., National Paper Quality Supervision and Inspection center.
The main drafters of this standard. Gao Jun, Qiu Wenlun, Li Defei.
This standard replaces the standard previously issued as follows.
- GB/T 22875-2008;
- GB/T 22905-2008.
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.
4 Requirements
The technical indicators of the super-absorbent polymer for paper diapers
(sheets, pads) and sanitary towels (pads) shall comply with the requirements of
Table 1.
5 Test methods
5.1 Sampling
Before sampling, it shall first shake the container which contains the sample for
3 times ~ 5 times, to mix the sample uniformly. Then place it for 5 min, open the
package to take out the sample.
5.3 Volatile content
The volatile content is determined in accordance with Appendix B.
5.4 pH
pH is determined in accordance with Appendix C.
5.5 Distribution of particle size
The distribution of particle size is determined in accordance with Appendix D.
5.6 Density
Density is determined in accordance with Appendix E.
5.10 Absorption amount under pressure
The absorption amount under pressure is determined in accordance with
Appendix I.
5.11 Extractables content
Extractable content is determined in accordance with Appendix J.
5.12 Appearance
Place the specimen in normal light to perform visual inspection.
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.
6.3 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.
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.
7.2 Transportation and storage
7.2.1 The products shall be transported by means which are rain-proof,
moisture-proof, and clean. It shall not be transported together with
contaminated materials.
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.2.7 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.
A.3.2 UV detector, the detector wavelength of 210 nm.
A.3.3 Balance, the sensitivity is 0.0001 g.
A.3.4 Beaker, the capacity is 250 mL.
A.3.5 Magnetic stirrer and stir bar.
A.3.6 Membrane filter, the membrane’s pore size is 0.45 μm.
A.3.7 C18 column, 5 μm, 4.6 mm x 150 mm or equivalent column, suitable for
guard column.
A.3.8 C18 guard column, 5 μm, 4.6 mm x 10 mm or equivalent guard column.
A.4 Determination steps
A.5 Calculation of results
Based on the peak area of the test solution and the standard working curve,
CALCULATE the concentration of acrylic acid in the sample solution. USE the
formula (A.1) to calculate the residual monomer (acrylic acid) content in the
sample.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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