GB/T 22905-2008 English PDF (GBT22905-2008)

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GB/T 22905-2008: Superabsorbent polymer for diaper
GB/T 22905-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 85.080
Y 39
Superabsorbent polymer for diaper
纸尿裤高吸收性树脂
ISSUED ON. DECEMBER 30, 2008
IMPLEMENTED ON. SEPTEMBER 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Requirements ... 4 
3 Test methods ... 4 
4 Inspection rules ... 5 
5 Marks, packaging, transport, storage ... 5 
Annex A (normative) Determination of residual monomer (acrylic acid) ... 7 
Annex B (normative) Determination of volatile matter content ... 9 
Annex C (normative) Determination of pH ... 11 
Annex D (normative) Determination of particle size distribution ... 12 
Annex E (normative) Determination of density ... 14 
Annex F (normative) Determinations of absorption and water retention ... 16 
Annex G (normative) Determination of pressure absorption ... 18 
Foreword
Annex A, Annex B, Annex C, Annex D, Annex E, Annex F, Annex G of this
Standard are normative.
This Standard was proposed by China Light Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee
on Paper Industry of Standardization Administration of China.
Main drafting organizations of this Standard. China Pulp and Paper Research
Institute, Jinan Haoyue Suction Material Co., Ltd., National Paper Quality
Supervision and Inspection Center.
The drafting organizations of this Standard. Sanda Fine Chemicals (Nantong)
Co., Ltd., BASF (China) Investment Co., Ltd., Formosa Plastics Resin (Ningbo)
Co., Ltd., Kimberly (China) Co., Ltd., Guangzhou P and G Co., Ltd., Fujian Hengan
Group Co., Ltd., Evonik Degussa (China) Investment Co., Ltd., Kao (China)
Investment Co., Ltd., Ritong Chemical (Zhangjiagang) Co., Ltd., Quanzhou
Banglida Technology Industrial Co., Ltd., You Nijia Daily Necessities (China)
Co., Ltd.
Main drafters of this Standard. Gao Jun, Yang Zhiliang, Zhou Junfeng.
Superabsorbent polymer for diaper
1 Scope
This Standard specifies the requirements, test methods, inspection rules and
marks, packaging, transport, storage for superabsorbent polymer of
polyacrylate for diaper.
This Standard is applicable to superabsorbent polymer of polyacrylate for all
kinds of baby diapers (pieces), adult incontinence products.
2 Requirements
2.1 The technical indicators of superabsorbent polymer for diaper shall comply
with the provisions of Table 1 or the contract.
Table 1
Name of indicator Unit Requirements
Residual monomer (acrylic acid) ≤ mg/kg 1800
Volatile matter content ≤ % 10.0
pH - 4.0~8.0
Particle size distribution < 106µm ≤ % 10.0 where < 45µm ≤ 1.0
Density g/cm3 0.3~0.9
Absorption ≥ g/g 40.0
Water retention ≥ g/g 20.0
Pressure absorption ≥ g/g 10.0
2.2 Product appearance shall be uniform in color.
3 Test methods
3.1 Residual monomer (acrylic acid) is determined according to Annex A.
3.2 Volatile matter content is determined according to Annex B.
3.3 pH is determined according to Annex C.
3.4 Particle size distribution is determined according to Annex D.
3.5 Density is determined according to Annex E.
3.6 Appearance. place the specimen under normal light for visual inspection.
3.7 The amount of absorption and water retention are determined according to
Annex F.
3.8 The amount of pressure absorption is determined according to Annex G.
4 Inspection rules
4.1 The production batch of one time is a batch.
4.2 Perform sampling evenly from the same batch and not less than 3
packaging bags. The sampling amount shall be 1 kg.
4.3 The product shall be inspected according to this Standard or contract before
leaving the factory. If there is a non-conformity after inspection, the sampling
shall be doubled and the unqualified item shall be re-inspected. The results of
re-inspection shall be the final inspection results.
4.4 The supplier (hereinafter referred to as the supplier) shall ensure that the
product quality complies with this Standard or the contract. Product quality
certificate shall be attached to the delivery.
4.5 The purchaser (hereinafter referred to as the purchaser) has the right to
inspect the product in accordance with this Standard or the contract. If there is
any objection to the quality of the product, the supplier shall be notified within
one month of arrival (or as specified in the contract). The supplier shall handle
it in time. If necessary, the sampling shall be performed by the supplier and the
purchaser together for the re-inspection. If the re-inspection result does not
comply with this Standard or the contract, it is determined as unqualified and
shall be handled by the supplier. If the re-inspection result meets the
requirements of this Standard or the contract, it shall be determined as qualified
and shall be handled by the purchaser. If the two parties still have disputes over
the results of the re-inspection, they shall submit to the higher-level testing
institutions approved by both parties for arbitration. The arbitration results shall
be as the basis for final determination.
5 Marks, packaging, transport, storage
5.1 The product marks, packaging shall be performed according to 5.2 or the
contract.
5.2 Products shall be packaged in bags with lined plastic film. The packaging
bag shall have sufficient strength to ensure that it shall not break or fall off during
use. Each batch of products shall be accompanied by a quality certificate,
indicating manufacturer's name, product name, trademark, date of production,
packaging quantity, inspection result and standard number used.
5.3 During product transport, it shall use rainproof, moisture proof, clean
transportation tools. Do not transport together with contaminated items.
5.4 The product shall not be dropped from a height or rolled in place during
handling.
5.5 The product shall be stored in a cool, ventilated and dry warehouse to
prevent the effects of rain, snow and ground moisture.
Annex A
(normative)
Determination of residual monomer (acrylic acid)
A.1 Apparatus and reagents
A.1.1 Beaker (with lid), with a capacity around 300mL.
A.1.2 Magnetic stirrer and stirring magnet.
A.1.3 Funnel and filter paper.
A.1.4 High performance liquid chromatography.
A.1.5 UV detector.
A.1.6 Chromatographic column, of which a programmed temperature of 5.5 min
or more shall be used.
A.1.7 100μL micro syringe.
A.1.8 Filter membrane filter, pore size of 0.45μm, for water system.
A.1.9 Electronic balance, with a resolution of 0.001g.
A.1.10 Saline, with a concentration of 0.9%.
A.1.11 Acrylic, excellent grade pure.
A.1.12 Phosphoric acid (H3PO4), excellent grade pure.
A.2 Measuring steps
A.2.1 Extraction of residual monomer (acrylic acid)
Weigh 1 g of specimen, to the nearest of 0.001 g. Pour into beaker. Then add
200 mL of saline of which the concentration is 0.9% (A.1.10). Put it back into
the rotor and cover it. Use the magnetic stirrer (A.1.2) to stir 1h. Use filter paper
(A.1.3) to filter. Use the filtrate as test solution.
A.2.2 Standard curve
Determine the peak area of the acrylic acid solution with a known concentration.
Draw a standard curve with the acrylic acid concentration as the abscissa and
the peak area as the ordinate.
A.2.3 Specimen determination
Use the micro syringe (A.1.7) to inject the testi...