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GB/T 32117-2015 English PDF (GBT32117-2015)

GB/T 32117-2015 English PDF (GBT32117-2015)

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GB/T 32117-2015: Cellulose diacetate flake for industrial use

This standard specifies the terms and definitions, categories, requirements, test methods, inspection rules, markings, packaging, transportation, storage and shelf life of cellulose diacetate flake for industrial use.
GB/T 32117-2015
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 71.080.99
G 17
Cellulose diacetate flake for industrial use
ISSUED ON. OCTOBER 09, 2015
IMPLEMENTED ON. MAY 01, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Classifications ... 6
5 Requirements ... 6
6 Test methods ... 7
7 Inspection rules ... 8
8 Marking, packaging, transportation and storage ... 8
9 Shelf life... 9
Appendix A (Normative) Determination of acetyl value ... 10
Appendix B (Normative) Determination of intrinsic viscosity ... 13
Appendix C (Normative) Determination of moisture ... 16
Appendix D (Normative) Determination of the plugging value ... 18
Appendix E (Normative) Determination of free acid ... 21
Appendix F (Normative) Determination of heat stability ... 23
Appendix G (Normative) Determination of brightness L and color a and color b ... 24
Foreword
This standard was drafted in accordance with the rules given GB/T 1.1-2009. This standard was proposed by the China Petrochemical Industry Federation. This standard shall be under the jurisdiction of the National Chemical
Standardization Technical Committee (SAC/TC 63).
The drafting organizations of this standard. Nantong Acetate Co., Ltd., China Chemical Economic and Technological Development Center, Ningbo Da?€?an
Chemical Industry Co., Ltd., Sichuan Pushi Acetate Co., Ltd.
The main drafters of this standard. Yang Zhanping, Wei Jing, Yang Jianhai, Li Xiaodong, Huanghua, Xie Linjun, Shen Lin, Gao Chunhong, Si Youyin, Zhang Dejie, Yu Wenji, Yang Xiaobing.
Cellulose diacetate flake for industrial use
1 Scope
This standard specifies the terms and definitions, categories, requirements, test methods, inspection rules, markings, packaging, transportation, storage and shelf life of cellulose diacetate flake for industrial use (abbreviated as diacetate flake).
This standard applies to diacetate flake produced by the plant cellulose under the action of catalyst through such processes as acetylation.
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 601 Chemical reagent - Preparations of standard volumetric solutions GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods
GB/T 6678 General principles for sampling chemical products
GB/T 6679 General rules for sampling solid chemical products
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Acetyl value
An indicator characterizing the degree of acetylation of diacetate flake, expressed as the mass fraction of the acetyl (acetic acid) replacing the hydroxyl cellulose.
3.2
Plugging value
An indicator characterizing the filterability of diacetate flake pulp. Under specified conditions, it is calculated in accordance with the amount of filtration.
3.3
Free acidity
An indicator characterizing the free acid of diacetate flake, expressed as the mass fraction of the free acidity (by acetic acid) contained in the diacetate flake.
3.4
Heat stability
The stability of diacetate flake to heat. Under the specified high temperature conditions, the number of grains of the baked diacetate flake which change into black brown, AND free of black brown indicates that the heat stability of the diacetate flake is qualified.
3.5
Brightness L
The color brightness of the diacetate flake in the three-dimensional uniform color space color measurement system. The greater the brightness value, the more white the diacetate flake; AND the smaller the brightness value, the more dark the diacetate flake.
3.6
Color a
The red and green degree of the diacetate flake in the three-dimensional uniform color space color measurement system. The color a indicates
reddish if it is positive, AND greenish if it is negative.
3.7
Color b
The blue and yellow degree of the diacetate flake in the three-dimensional uniform color space color measurement system. The color a indicates
yellowish if it is positive, AND greenish if it is blueish.
4 Classifications
Diacetate flakes are divided into two types in accordance with the purpose of use. spinning type and plastic type.
Spinning type diacetate flake is used for the manufacture of textile tows or cigarette filter tows.
Plastic type diacetate flake is used in the manufacture of glasses frames, filtering membrane and other plastic products.
5 Requirements
5.1 Appearance
Diacetate flakes are in white powder or strip-like, without visible mechanical impurities.
5.2 Technical requirements
5.2.1 Diacetate flakes shall be determined in accordance with the
corresponding test methods and the technical requirements as shown in Table 1.
Table 1 -- Technical requirements
Item Indicators Spinning type Plastic type
Acetyl value (by CH3COOH), w/% Design value a ?? 0.50 Design value a ?? 0.50 Intrinsic viscosity / (dL/g) Design value a ?? 0.15 Design value a ?? 0.15 Moisture, w /% ??? 6.0 ??? 3.0
Plugging value / (g/cm2) ??? 25 ??? 50
Free acidity (by CH3COOH), w/% ??? 0.010 ??? 0.010
Heat stability - Qualified
Brightness L - ??? 92.0
Color a - ??? 0.0
Color b ??? 6.0 ??? 3.0
a The design values are agreed between the supplier and the user in the supply contract agreement. 5.2.2 When the diacetate flakes are used in the manufacture of clothing tow, teeth and other skin or mouth contact products, they shall comply with the relevant industry practices.
6 Test methods
Warning. Some test procedures and the acetone solution used in the test method may cause dangerous situations. The operator shall take
appropriate safety and protective measures.
6.1 General provisions
Unless otherwise specified, only water identified as analytical pure reagent and level III water or equivalent purity as specified in GB/T 6682 is used in the analysis. The standard solutions, reagents and products as required for analysis, unless otherwise specified, shall be prepared in accordance with the provisions of GB/T 601 and GB/T 603.
6.2 Sample Preparation
At ambient temperature (23 ?? 5) ??C and humidity relative humidity (60 ?? 15) %, TAKE the laboratory sample of about 250 g; POUR it into a clean grinder (grinding speed shall not exceed 1000 r/min. If the grinder inside is not clean, after cleaning it, it is preferable to first place about 60 g of sample into the grinder to grinding it. TAKE out the ground sample and DISCARD it.) LET the thoroughly ground sample all pass the 20-mesh standard sieve to produce a powder with a particle size of less than 850 ??m. Immediately CONTAIN the powder into the glass bottle; COVER the cap to seal it; PREPARE for analysis. 6.3 Determination of acetyl value
MAKE determination in accordance with the provisions of Appendix A.
6.4 Determination of intrinsic viscosity
MAKE determination in accordance with the provisions of Appendix B.
6.5 Determination of moisture
MAKE determination in accordance with the provisions of Appendix C.
6.6 Determination of plugging value
MAKE determination in accordance with the provisions of Appendix D.
6.7 Determination of free acidity
MAKE determination in accordance with the provisions of Appendix E.
6.8 Determination of heat stability
MAKE determination in accordance with the provisions of Appendix F.
6.9 Determination of brightness L and color a and color b
MAKE determination in accordance with the provisions of Appendix G.
7 Inspection rules
7.1 All items as required in clause 5 are exit-factory inspection items. 7.2 Under the same conditions of raw materials and processes, the actual batch of products continuously produced is considered as a batch, AND the maximum amount of a batch shall not exceed 500 t.
7.3 The diacetate flake sampling methods and sampling units shall be in accordance with the provisions of GB/T 6678 and GB/T 6697. The sampling amount is not less than 1500 g. After the sample is uniformly mixed, it is quartered and contained into 2 clean and dray transparent pl...

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