GB/T 25254-2022 PDF English
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| GB/T 25254-2022 | English | 230 |
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Poly-(tetra methylene ether glycol)(PTMEG) for industrial use
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| GB/T 25254-2010 | English | 399 |
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Poly-(tetra methylene ether glycol) (PTMEG) for industrial
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GB/T 25254-2022: Poly-(tetra methylene ether glycol)(PTMEG) for industrial use---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/GBT25254-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.040.01
CCS G 32
Replacing GB/T 25254-2010
Poly-(Tetra Methylene Ether Glycol) (PTMEG) for
Industrial Use
Issued on. APRIL 15, 2022
Implemented on. NOVEMBER 1, 2022
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 Classification and Naming... 6
5 Technical Requirements... 6
6 Test Methods... 7
7 Inspection Rules... 12
8 Marking and Accompanying Documents... 13
9 Packaging, Transportation and Storage... 13
Appendix A (Normative) Determination of Average Molar Mass and Hydroxyl Value
... 15
Appendix B (Normative) Determination of Carbonyl Ratio... 19
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document replaced GB/T 25254-2010 Poly-(Tetra Methylene Ether Glycol) (PTMEG) for
Industrial Use. Compared with GB/T 25254-2010, the major technical changes of this
Document are as follows besides the structural adjustments and editorial modifications.
--- Add Terms and Definitions (see Clause 3 of this Edition);
--- Delete the technical requirements of PTMEG650 specifications (see Table 1 of the 2010
Edition);
--- Increase the nominal value range of the average molar mass (see Table 1 of this Edition);
--- Change the colorimetric technical requirements (see Table 1 of this Edition; Table 1 of
the 2010 Edition);
--- Change the determination methods of average molar mass and hydroxyl value (see 6.3
of this Edition; 5.4 of the 2010 Edition);
--- Add viscosity nominal value, viscosity nominal value range (see Table 1 of this Edition)
and viscosity measurement method (see 6.4 of this Edition);
--- Change the determination method of acid value (see 6.7 of this Edition; 5.5 of the 2010
Edition);
--- Delete the technical requirements for peroxide (see 4.2 of the 2010 Edition) and
measurement methods (see 5.6 of the 2010 Edition);
--- Add technical requirements and measurement methods for carbonyl ratio (see Table 1,
6.8 of this Edition);
--- Add the calculation method of molar mass ratio (see 6.9 of this Edition);
--- Change the solvent used in the determination of stabilizers (see 6.10 of this Edition; 5.7
of the 2010 Edition);
--- Increased batch size limit (see 7.2 of this Edition).
Please note some contents of this Document may involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
This Document was proposed by China Petroleum and Chemical Industry Federation.
This Document shall be under the jurisdiction of National Technical Committee on Plastics of
Standardization Administration of China (SAC/TC 15).
Drafting organizations of this Document. Sichuan Tianhua Fubang Chemical Industry Co., Ltd.;
Chiyuan Chemical Branch of Chongqing Jianfeng New Materials Co., Ltd.; Shaanxi Shanhua
Coal Chemical Co., Ltd.; Changlian Chemical (Panjin) Co., Ltd.; Dalian Chemical (Jiangsu)
Co., Ltd.; Xinjiang Bluebridge Tunhe Energy Co., Ltd.; China Bluestar Chengrand Chengdu
Detection Tech Co., Ltd.; and CGNPC Jun’er New Material Co., Ltd.
Chief drafting staffs of this Document. Xu Lianghui, Zhang Pingyuan, Wang Fu, Bian Lili,
Zeng Wenqian, Wang Zhiwei, He Wenqing, Zhang Yanjun, Zhou Yunguo, Liu Bin, Zhou
Xijiang, He Yi, and Xiang Yong.
This Document was first time published in 2010; it is the first time revised hereby.
Poly-(Tetra Methylene Ether Glycol) (PTMEG) for
Industrial Use
1 Scope
This Document specifies the classification and naming, technical requirements, test methods,
inspection rules, marking and accompanying documents, packaging, transportation and storage
of poly-(tetra methylene ether glycol) (PTMEG) for industrial use.
This Document applies to industrial PTMEG produced by polymerization of tetrahydrofuran
monomer.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in 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) is applicable to this Document.
GB/T 601 Chemical Reagent – Preparations of Reference Titration Solutions
GB/T 603 Chemical Reagent – Preparations of Reagent Solutions for Use in Test Methods
GB/T 3143 Color Determination Method of Liquid Chemicals (Hezen Unit – Platinum –
Cobalt Scale)
GB/T 4472-2011 Determination of density and relative density for chemical products
GB/T 6283 Chemical products – Determination of water Karl Fischer method (general
method)
3 Terms and Definitions
For the purposes of this Document, there are no terms and definitions apply.
4 Classification and Naming
The specifications of PTMEG are represented by PTMEG and average molar mass. For
PTMEG with an average molar mass below 1000g/mol, each ±25g/mol is one specification.
5 Technical Requirements
5.1 Appearance
Solid. white waxy;
Liquid. colorless and transparent, no visible impurities.
6 Test Methods
Warning. Personnel using this document shall have practical working experience in
formal laboratory.
6.1 Basic requirements
6.2 Appearance
Observe the sample visually under natural light or fluorescent lighting.
6.3 Average molar mass and hydroxyl value
The average molar mass and hydroxyl value are determined according to Appendix A.
6.4 Viscosity
The viscosity is measured according to the method specified in Clause 2 of GB/T 10247-2008,
using a precision constant temperature bath and thermometer, and the test temperature is set to
40.00°C. The comparison of specification and density of PTMEG is shown in Table 2.
6.5 Moisture
The measurement shall be carried out in accordance with the provisions of GB/T 6283; and the
arithmetic mean of the parallel measurement results shall be taken as the report result. The
absolute difference of the parallel measurement results shall be no greater than 25 mg/kg.
6.6 Chroma
The measurement shall be carried out according to the provisions of GB/T 3143, and the sample
measurement temperature is 40℃~60℃.
6.7 Acid value
6.7.1 Principle
Dissolve the sample in an alkaline methanol solvent. After neutralizing the acidic substance,
titrate the excess alkali with standard hydrochloric acid titration solution.
6.7.2 Instruments
6.7.3 Reagents
6.7.4 Determination procedures
6.7.4.1 Instrument settings
Set the control parameters according to the operating instructions of the automatic
potentiometric titrator; and set the end point determination method to pH=5.3.
6.7.4.2 Determination
Take 10g of the specimen (accurate to 0.01g) into a 100mL glass beaker; add 50.00mL of
methanol solvent; stir until completely dissolved; perform potentiometric titration with
standard hydrochloric acid titration solution; record the standard titration solution volume (V1)
required when the titration reaches pH=5.3.At the same time, measure the blank solution
volume (V10).
6.7.6 Tolerance
The arithmetic mean of the parallel measurement results is the report result; and the relative
deviation of the two parallel measurement results is no greater than 20%.
6.8 Carbonyl ratio
Measure according to Appendix B.
6.9 Molar mass ratio
6.9.1 Method summary
The molar mass ratio of PTMEG is calculated by an empirical formula based on the measured
viscosity and average molar mass.
6.10 Stabilizer (BHT) content
6.10.1 Method summary
Prepare a standard solution based on the features with characteristic absorption of BHT at
278nm; and establish a standard curve between concentration and absorbance.
6.10.2 Instruments
6.10.3 Reagents
6.10.3.1 Methanol.
6.10.4 Drawing of working curve
6.10.4.1 Add 1.0mL, 2.0mL, 3.0mL, 4.0mL and 5.0mL of standard BHT solution to the 100mL
volumetric flask respectively, and dilute to the mark by methanol.
6.10.5 Determination of sample
Weigh 10g of the sample (accurate to 0.01g), add it to a 100mL volumetric flask; dilute to the
mark with methanol; and shake well. Use methanol as a blank, use a 10mm cuvette to perform
spectral scanning; perform data processing on the spectrum; and calculate the corrected
absorbance at 278nm.
7 Inspection Rules
7.1 Inspection classification
7.2 Batching rules
Products are inspected in batches, and the mixing volume in the same storage tank is considered
a batch, and the batch size does not exceed 3000t.
7.3 Sampling
Carry out nitrogen replacement and protection sampling according to the provisions in GB/T
6678 and GB/T 6680.The sample size shall be no less than 0.5kg.
7.4 Judgment rules
The inspection results are judged according to the rounding value comparison method specified
in GB/T 8170 to determine whether they meet the requirements in Clause 5.
8 Marking and Accompanying Documents
8.1 Marking
PTMEG products shall be accompanied by product marks, including. product name, product
standard number, manufacturer name and address, net content, production batch number,
certificate of conformity, etc.
9 Packaging, Transportation and Storage
9.1 Packaging
PTMEG products shall be packed in clean stainless steel tank trucks or clean, dry, strong steel
drums, or other containers that meet the requirements. When packaging, it shall be filled with
nitrogen and sealed. The quality requirements of nitrogen include. dew point no greater than -
40℃, oxygen content no greater than 5μg/g.
9.3 Storage
PTMEG shall be stored and sealed with dry nitrogen (nitrogen quality requirements are the
same as 9.1). The suitable temperature for storage in the storage tank is 45 ℃ ~ 80 ℃. Barrel
products shall be stored in a dry and ventilated environment. The product can be molten by hot
air or steam heating during use. PTMEG product shelf life. in solid state, the shelf life is 12
months; in liquid state, the shelf life is 6 months.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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