GB/T 17931-2018 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 17931-2018 | English | 210 |
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Poly (ethylene terephthalate) (PET) resin for bottles
| Valid |
| GB 17931-2003 | English | 639 |
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4 days
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[GB/T 17931-2003] Poly (ethylene terephthalate) (PET) resin for bottles
| Obsolete |
| GB/T 17931-1999 | English | 919 |
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6 days
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Bottle grade polyester chip
| Obsolete |
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GB/T 17931-2018: Poly (ethylene terephthalate) (PET) resin for bottles---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/GBT17931-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
G 32
Replacing GB/T 17931-2003
Poly (ethylene terephthalate) (PET) resin for bottles
Issued on: DECEMBER 28, 2018
Implemented on: NOVEMBER 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Product classification... 6
5 Requirements... 7
6 Test methods... 7
7 Inspection rules... 9
8 Marking and accompanying documents... 11
9 Packaging, transportation and storage... 11
Annex A (informative) Statistical results of the precision test of the intrinsic viscosity
of PET resin for bottles... 12
Annex B (normative) Preparation of density gradient columns - Batch method... 13
Annex C (informative) Relationship between PET crystallinity and density... 15
Poly (ethylene terephthalate) (PET) resin for bottles
1 Scope
This Standard specifies the terms and definitions, product classification, requirements,
test methods, inspection rules, marking and accompanying documents, packaging,
transportation and storage for poly (ethylene terephthalate) (PET) resin for bottles.
This Standard applies to homopolymer PET resin that uses purified terephthalic acid
and ethylene glycol as the main raw materials, and is produced by direct esterification
continuous polycondensation or intermittent polycondensation AND copolymer PET
resin that uses purified terephthalic acid, ethylene glycol and isophthalic acid as the
main raw materials and adopts direct esterification continuous polycondensation or
intermittent polycondensation to produce.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 1033.1-2008, Plastics -- Methods for determining the density of non-cellular
plastics -- Part 1.Immersion method, liquid pycnometer method and titration
method
GB/T 1033.2-2010, Plastics -- Methods for determining the density of non-cellular
plastics -- Part 2.Density gradient column method
GB 4806.6, National Food Safety Standard -- Plastic resin used in food-contact
GB/T 6678-2003, General principles for sampling chemical products
GB/T 6679-2003, General rules for sampling solid chemical products
GB/T 6682-2008, Water for analytical laboratory use -- Specification and test
methods
GB/T 8170-2008, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 9345.2-2008, Plastics -- Determination of ash -- Part 2.Poly (alkylene
terephthalate) materials
GB/T 14190-2017, Testing methods of fiber grade polyester (PET) chip
GB/T 19466.3-2004, Plastics -- Differential scanning calorimetry (DSC) -- Part 3.
Determination of temperature and enthalpy of melting and crystallization
SH/T 1817-2017, Plastics -- Determination of residual acetaldehyde in polyethylene
terephthalate (PET) resin for bottles -- Headspace gas chromatography
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 color b value
The degree to which a substance varies from blue to yellow in the CIE standard.
3.2 color L value
The brightness of a substance according to the CIE standard.
3.3 impurity
Substances other than PET resin.
3.4 powder
Debris passing through a test sieve with a mesh size of 800 μm (20 mesh).
3.5 color granule
Yellow particles or other colored particles can be seen with the naked eye.
3.6 efficiently endothermic PET resin
A PET resin which is polymerized from purified terephthalic acid, ethylene glycol and
isophthalic acid as main raw materials and used for injection molding and blowing of
bottles by adding additives, and has the function of improving the heat absorption
efficiency of the blowing process.
4 Product classification
PET resin for bottles can be divided into two categories according to different uses.
food packaging and non-food packaging.
6.4 Intrinsic viscosity
6.4.1 Specimen preparation
Place about 10 g of sample in liquid nitrogen or dry ice and cool for about 10 min. After
taking out the sample, crush it immediately with a crusher. The crushing time shall not
exceed 30 s. The sample shall be crushed into particles less than 1 mm. All crushed
particles are used as test samples.
6.4.2 Test steps
Follow the provisions of 5.1 of GB/T 14190-2017.The solvent is prepared according
to 5.1.1.3.2.Method A (capillary viscometer method) is the arbitration method. Among
them, the specimen volume is (0.125±0.005) g. The dissolution conditions are. dissolve
the specimen completely at (110±10)℃. The dissolution time shall be controlled within
30 min. If this time is exceeded, the sample shall be re-prepared. The temperature of
the constant temperature water bath is. (25.00±0.02)℃.
6.4.3 Result calculation
According to 5.1.1.7.3 of GB/T 14190-2017.The statistical results of the precision test
of the intrinsic viscosity of a PET resin for bottles are shown in Annex A.
6.5 Acetaldehyde content
According to SH/T 1817-2017.
6.6 Chroma
The drying process is carried out according to the provisions of 5.5 Method B (Drying
Method) in GB/T 14190-2017, where the drying condition is (135 ± 5) °C and the
drying time is 30 min.
6.7 Diethylene glycol content
According to 5.2 Method A (methanol transesterification method) in GB/T 14190-2017.
6.8 Carboxyl terminal content
The method is carried out according to the provisions of 5.4 of GB/T 14190-2017.
Among them, Method A (volumetric titration) is the arbitration method. The specimen
volume requirement of Method A is. weigh (1.5±0.1)g of specimen, accurate to 0.0001
g.
6.9 Melting peak temperature (DSC method)
The test is carried out in accordance with GB/T 19466.3-2004.The heating rate is
10℃/min. It is recommended to test without nitrogen.
6.10 Particle appearance
6.10.1 Powder
Proceed as per 5.8 Method A (dry method) in GB/T 14190-2017.
6.10.2 Color granule
Weigh 500 g of the specimen, accurate to 1 g. Place the specimen in a white enamel
dish. Pick out the particles of different colors and record their number.
6.11 Moisture
The test is carried out according to the provisions of 5.7 of GB/T 14190-2017.Among
them, Method A (gravimetric method) is the arbitration method.
6.12 Density
Density can be measured by immersion method and density column method. The
immersion method is used in arbitration.
The immersion method is carried out in accordance with the provisions of GB/T 1033.1-
2008.The immersion liquid is anhydrous ethanol. The density of the anhydrous ethanol
immersion liquid is measured according to the method in 5.1.4.3 of GB/T 1033.1-2008.
It can also be measured using a standard glass float (according to the sample density
measurement conditions; the mass of the standard glass float in the air and the apparent
mass in the immersion liquid are tested respectively; and then the density of the
immersion liquid is calculated according to formula (2) in GB/T 1033.1-2008). It is
recommended to use a standard glass float with a density value close to that of PET
resin.
According to the provisions of GB/T 1033.2-2010, the density gradient liquid adopts n-
heptane/carbon tetrachloride system. The continuous method for preparing density
gradient columns is in accordance with 5.4.2 of GB/T 1033.2-2010.The intermittent
method for preparing density gradient columns is in accordance with the provisions of
Annex B.
For the relationship between crystallinity and density, see Annex C.
6.13 Ash content
According to GB/T 9345.2-2008, the sample weight is 20 g. The temperature of the
muffle furnace is (850±50)℃.
7 Inspection rules
7.1 Inspection category
8 Marking and accompanying documents
8.1 Marking
The outer packaging bags of PET resin products for bottles shall have obvious markings.
The markings include. trademark, manufacturer name, manufacturer address, standard
number, product name, brand, batch number (including production date) and net content,
as well as warning signs for product protection and handling.
8.2 Accompanying documents
When the products leave the factory, each batch of products shall be accompanied by a
product quality inspection certificate. The certificate shall indicate the product name,
designation, batch number, implementation standard, and be stamped with a special
quality inspection seal.
9 Packaging, transportation and storage
9.1 Packaging
The packaging of PET resin for bottles can be divided into bulk bags, tank trucks,
container sea bags and other forms. The packaging bag of bulk bag products is a
polyolefin woven bag lined with a polyethylene film inner bag and covered with a
polyethylene dustproof film. The tank truck for transporting products shall be clean,
dry and free of foreign matter.
9.2 Transportation
PET resin for bottles is non-dangerous goods. There are no special requirements for
transportation. However, certain protective measures shall be taken during
transportation and loading-unloading to prevent the product from getting damp,
contaminated, or damaged. The transportation vehicle shall be kept clean and dry, and
equipped with a shed or tarpaulin. Sharp tools such as iron hooks shall not be used
during transportation and loading-unloading. Mechanical collisions shall be prevented.
During transportation, it must not be mixed with sand, broken metal, coal, glass, etc. It
must not be mixed with toxic, corrosive or flammable materials. It shall not be exposed
to the sun or rain. Loading and unloading operations must comply with warning sign
regulations.
9.3 Storage
PET resin for bottles shall be stored in a cool, dry, ventilated, clean warehouse equipped
with fire-fighting facilities. Take dust prevention measures. When storing, keep away
from heat sources and avoid direct sunlight. Do not pile in the open air.
Annex B
(normative)
Preparation of density gradient columns - Batch method
B.1 Reagents and materials
Unless otherwise stated, only analytically pure reagents are used in the analyses.
B.1.1 n-Heptane. analytically pure.
B.1.2 Carbon tetrachloride. analytically pure.
B.2 Instruments
B.2.1 Density gradient tube. See 5.1.1 to 5.1.3 of GB/T 1033.2-2010.
B.2.2 Magnetic stirrer.
B.2.3 Erlenmeyer flask. capacity is 500 mL.
B.2.4 Capillary funnel. inner diameter is about 0.5 mm; length is greater than the height
of the density gradient tube.
B.2.5 Measuring cylinder. capacity is 100 mL, 200 mL.
B.3 Preparation of density gradient column for determination of PET resin density
B.3.1 The density gradient column shall be prepared to ensure that the sensitivity of the
density gradient column is not less than 0.001 g/cm3 per centimeter of column height.
For example. the ideal density range for a gradient tube is 0.001 g/cm3 ~ 0.1 g/cm3.The
upper and lower ends of the tube shall not be used. Readings outside the calibration
section shall not be taken.
B.3.2 Prepare 10 component solutions according to the requirements in Table B.1.
When preparing each solution, use a measuring cylinder (B.2.5) to measure carbon
tetrachloride and n-heptane respectively. Add them to a conical flask (B.2.3). Stir
thoroughly with a magnetic stirrer (B.2.2).
NOTE. The density range of the density gradient column is determined by the density value of the
product. The volume of each component is allocated according to the total volume of the density
gradient tube.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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