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

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

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GB/T 22905-2008: Superabsorbent polymer for diaper

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.
GB/T 22905-2008
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 85.080
Y 39
Superabsorbent polymer for diaper
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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 < 106??m ??? % 10.0 where < 45??m ??? 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.1.7 100??L micro syringe.
A.1.8 Filter membrane filter, pore size of 0.45??m, 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 testing solution into the high performance liquid chromatography (A.1.4) through the filter membrane filter (A.1.8). Determine according to the following conditions. Calculate the peak area.
Conditions for determination.
Mobile phase. 0.1% H3PO4 aqueous solution;
Flow. 1.0mL/min ~ 2.0mL/min;
Injection volume. 20??L ~ 100??L;
UV detector (A.1.5). detection wavelength is 210nm.
A.3 Representation of results
According to the peak area and standard curve of the testing solution, calculate the residual monomer (acrylic acid) content in the specimen according to formula (A.1), to the nearest of the first place after the decimal point. Where,
X - Residual monomer (acrylic acid) content, in milligrams per kilogram (mg/kg); c - Acetic acid concentration obtained from the standard curve, in milligrams per liter (mg/L);
m - Mass of weighed specimen, in grams (g).
Annex B
(normative)
Determination of volatile matter content
B.1 Apparatus and reagents
B.1.1 Oven, which can keep the temperature at 105??C ?? 2??C.
B.1.2 Dryer.
B.1.3 Electronic balance, with a resolution of 0.001g.
B.1.4 Specimen container, for specimen transfer and weighing. This container is made of a lightweight material that is water-resistant and resistant to changes under test conditions.
B.2 Measuring steps
B.2.1 Weigh 5 g of specimen, to the nearest of 0.001 g. Load into the container (B.1.4) with a constant weight. Place the container that has contained the specimen into the (105??2)??C oven (B.1.1), drying for 4h. And open the lid of the weighing container and dry it together. When the drying is finished, the lid of the container shall be covered in the oven. Then move into the dryer (B.1.2) to cool. Weigh the container and the specimen mass after 30 min.
B.2.2 Repeat the above steps by moving the weighing container into the oven again. Drying time between two consecutive weighings shall be no less than 1h. When the difference between two consecutive weighings is not more than 0.2% of the original mass of the specimen, it can be determined that the specimen reaches a constant weight.
B.3 Representation of results
B.3.1 Calculation of volatile matter content
The volatile matter content can be calculated according to formula (B.1). Where,
X - Volatile matter content, %;
m1 - Mass of specimen before drying, in grams (g);
m2 - Mass of specimen after drying, in grams (g).
B.3.2 Representation of results
Simultaneously perform two measurements. Take the arithmetic mean as the measurement result, and round up to the integer position. The error between the two measurements shall not exceed 0.2% (absolute value).
Annex C
(normative)
Determination of pH
C.1 Apparatus and reagents
C.1.1 Electronic balance, with a resolution of 0.001g.
C.1.2 Measuring cylinder, with a resolution of 100mL.
C.1.3 Magnetic stirrer.
C.1.4 pH meter.
C.1.5 Saline, with a concentration of 0.9%.
C.2 Measuring steps
C.2.1 Use measuring cylinder (C.1.2) to accurately measure 100 mL of saline (C.1.5). Pour into a 150mL beaker. And place on the magnetic stirrer (C.1.3) for moderate stirring. Avoid bubbles in the solution during the mixing process. C.2.2 Use the electronic balance (C.1.1) to weigh 0.5 g of specimen, to the nearest of 0.001 g. Slowly add the weighed specimen into the beaker. After moderate stirring for 10 min, remove the beaker from the magnetic stirrer and stop stirring. Place still for 8 min so as to precipitate suspended resin. C.2.3 According to the instrument instructions, use buffer solution to adjust pH meter (C.1.4). The pH composite electrode is then slowly inserted into the solution above the precipitated specimen. Read the pH meter value after 2 min. In order to prevent contamination of the electrode, the electrode shall not touch the specimen. After reading the indication, remove the electrode and rinse thoroughly with deionized water, then immerse it in the electrode protection buffer solution.
C.3 Representation of measurement results
The measurement results are read directly from the pH meter. Simultaneously perform the two measurements. Take the average of two measurements as the measurement result. The result is rounded to one decimal place.
Annex D
(normative)
Determination of particle size distribution
D.1 Apparatus and reagents
D.1.1 Electronic balance, with a resolution of 0.01g.
D.1.2 Screen vibrator, with an amplitude of 1mm, with a frequency of 1400r/min. D.1.3 Screen, using standard sieves with mesh sizes of 45??m and 106??m.
D.1.4 Receiving base plate and cover.
D.1.5 Brush.
D.2 Measuring steps
D.2.1 Clean the screen (D.1.3) before each use. Check the entire surface of the screen under the light source. Check the damage of each screen. If any cracks or holes are found, discard the damaged screen and replace it with a new one. If the screen is not clean, it needs to be cleaned.
D.2.2 Lay the screen on the screen vibrator (D.1.2). Place the receiving base plate (D.1.4) at the bottom. Stack the sieves from top to bottom in the order of 106??m to 45??m. Weigh 100g of specimen with a 250mL glass beaker, to the nearest of 0.01g. Pour the specimen gently into the top of the sieve. Cover with the cover (D.1.4) and start the screen vibrator to vibrate for 10min. Then carefully remove the screen. Weigh the 45??m screen and the mass of the
specimen on the receiving base plate. Ventilation airflow shall be avoided during the measurement. Use the brush (D.1.5) to collect the lower part of the sieve into the waste dish and clean the screen.
D.3 Representation of measurement results
The particle size distribution can be calculated according to formula (D.1) and formula (D.2).
Where,
X1 - Content below 106??m, %;
X2 - Content below 45??m, %;
m1 - Total mass of specimen, in grams;
m2 - The mass of the specimen remaining on the 45??m sieve, in grams (g); m3 - The mass of the specimen remaining on the receiving base plate, in grams (g).
Simultaneously perform the two measurements. Take the arithmetic mean as the measurement result, the result is rounded to one decimal place.
Annex E
(normative)
Determination of density
E.1 Apparatus and reagents
E.1.1 Densitometer.
E.1.2 Funnel, with a capacity greater than 120mL, with perforated throttling damping or baffle, inner diameter of the orifice 10.00mm ?? 0.01mm.
E.1.3 Density cup, with a cup capacity of 100cm3??0.5cm3.
E.1.4 Electronic balance, with a resolution of 0.01g.
E.2 Measuring steps
E.2.1 Place the densitometer (E.1.1) on the platform. Adjust the screws on the three feet to keep them horizontal. Place the washed and dried funnel (E.1.2) vertically at a height of 40mm ?? 1mm above the center of the density cup (E.1.3) to ensure the funnel level. Weigh the mass of the empty density cup m1, to the nearest of 0.01g. Then place the weighed empty density cup directly below the funnel.
E.2.2 Weigh about 120g of specimen and gently add it to the funnel. The orifice throttling damping or baffle under the funnel is closed. Quickly open the orifice throttling damping or baffle under the funnel to allow the specimen inside the funnel to fall naturally. Use a glass rod to scrape off the excess specimen on the top of the density cup. Do not tap or shake the density cup. Weigh the mass of the density cup that contains the specimen m2, to the nearest of 0.01g. E.3 Representation of measurement results
The density can be calculated according to formula (E.1).
Where,
?? - The density, in grams per cubic centimeter (g/cm3);
m1 - The mass of the empty density cup, in grams (g);
m2 - The mass of the density cup that contains the specimen, in grams;
V - The volume of the density cup, in cubic centimeter (cm3).
Simultaneously perform the two measurements. Take the arithmetic mean as the measurement result, the result is rounded to one decimal place.
Annex F
(normative)
Determinations of absorption and water retention
F.1 Apparatus and reagents
F.1.1 Electronic balance, with a resolution of 0.001g.
F.1.2 Paper tea bag, with a size of 60mm ?? 85mm, a gas permeability of
(230??50) L/(min??100cm2) (pressure difference of 124Pa).
F.1.3 Clip, for fixing the tea bag.
F.1.4 Centrifugal dewatering machine, with a diameter of 200mm and a speed of 1500 r/min (which can generate a centrifugal force of about 250g).
F.1.5 Saline, with a concentration of 0.9%.
F.2 Measuring steps
F.2.1 Determination of absorption
F.2.1.1 Weigh 0.2g of specimen, to the nearest of 0.001g. Record this mass as m. Pour this specimen into the bottom of the tea bag (F.1.2). The specimen attached to the inside of the tea bag shall also be poured into the bottom of the tea bag.
F.2.1.2 Seal the tea bag. Soak in a beaker containing a sufficient amount of 0.9% saline (F.1.5). The soaking time is 30min.
F.2.1.3 Gently pour out the tea bag that contains the specimen. Use the clip (F.1.3) to hang up. Drip water at rest for 10 min. When multiple tea bags are hung at the same time, note that the tea bags shall not touch each other. F.2.1.4 After 10 minutes, weigh the mass of the tea bag that contains the specimen m1.
F.2.1.5 Use the tea bag that does not have the specimen for the determination of blank value. Weigh the mass of the tea bag of the blank test. Record this mass as m2.
F.2.2 Determination of water retention
F.2.2.1 Perform the centrifugal dewatering the tea bag that contains the specimen and the absorption amount has been measured for 3min under the condition of 250 g of centrifugal force (see F.1.4).
F.2.2.2 After the dewatering finishes in 3min, weigh the mass of the tea bag that contains the specimen. Record this mass as m3.
F.2.2.3 Use the tea bag that does not have the specimen to perform the
determination of blank value, simultaneously. Weigh the mass of the tea bag for the blank test and record this mass as m4.
F.3 Representation of measurement results
The absorption and water retention amounts can be calculated according to formula (F.1) and formula (F.2).
Where,
c1 - The absorption amount, in grams per gram (g/g);
c2 - The water retention amount, in grams per gram (g/g);
m - The mass of the weighed specimen, in grams (g);
m1 - The mass of the tea bag that contains the specimen, in grams (g);
m2 - The mass of the tea bag for the blank test, in grams (g);
m3 - The mass of the tea bag that contains the specimen after dewatering, in grams (g);
m4 - The mass of the tea bag for the blank test after dewatering, in grams (g). Simultaneously perform the two measurements. Take the arithmetic mean as the measurement result, the result is rounded to one decimal place.
Annex G
(normative)
Determination of pressure absorption
G.1 Apparatus and reagents
G.1.1 Plastic drum with an inner diameter of 25mm, an outer diameter of 31mm, a height of 32mm, and a 50??m nylon mesh on the bottom surface.
G.1.2 Plastic piston stuck with weight (2068Pa), drum type, with an outer diameter of 25 mm, can be tightly connected with plastic drum (G.1.1), and can move up and down freely.
G.1.3 Electronic balance, with a resolution of 0.001g.
G.1.4 Shallow base plate, with an inner diameter of 85mm, a height of 20mm, and stuck with a metal wire with a diameter of 2mm, as shown in Figure G.1. Figure G.1
G.1.5 Saline, with a concentration of 0.9%.
G.2 Measuring steps
G.2.1 The measurement shall be carried out at (23??2)??C.
G.2.2 Add 25g of standard physiological saline at a temperature of (23??2)??C to the shallow base plate (G.1.4). Place this plate on the platform.
G.2.3 Weigh 0.160 g of specimen m1, to the nearest of 0.001 g. Load into the plastic drum (G.1.1).
G.2.4 Place the plastic piston stuck with weight (G.1.2) into the plastic drum that has loaded with testing specimen (G.1.1). Weigh its mass m2.
Plastic drum Below plastic drum Plastic ...

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