GB/T 1548-2016 English PDF

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GB/T 1548-2016: Pulps -- Determination of limiting viscosity number in cupriethylenediamine (CED) solution
Status: Valid

GB/T 1548: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 1548-2016	359	Add to Cart	4 days	Pulps -- Determination of limiting viscosity number in cupriethylenediamine (CED) solution	Valid
GB/T 1548-2004	519	Add to Cart	3 days	Pulps -- Determination of viscosity	Obsolete
GB/T 1548-1989	319	Add to Cart	3 days	Pulps--Determination of viscosity	Obsolete

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Basic data

Standard ID: GB/T 1548-2016 (GB/T1548-2016)
Description (Translated English): Pulps -- Determination of limiting viscosity number in cupriethylenediamine (CED) solution
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y30
Classification of International Standard: 85.040
Word Count Estimation: 18,185
Date of Issue: 2016-12-13
Date of Implementation: 2017-07-01
Older Standard (superseded by this standard): GB/T 1548-2004
Regulation (derived from): National Standard Notice No.3316 of 2016
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 1548-2016: Pulps -- Determination of limiting viscosity number in cupriethylenediamine (CED) solution

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Pulps - Determination of limiting viscosity number in cupri-ethylenediamine (CED) solution ICS 85.040 Y30 National Standards of People's Republic of China Replace GB/T 1548-2004 Properties of Pulp Copper Ethylenediamine (CED) Solution Determination of viscosity values Pulps-Determination oflimitingviscositynumber incampri-ethylenediamine (CED) solution (ISO 5351..2010, MOD) 2016-12-13 released 2017-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China China National Standardization Management Committee released Directory Preface I 1 Scope 1 2 normative reference document 1 3 Terms and definitions 1 4 Principle 2 5 Reagent 2 6 instrument 3 7 Viscometer calibration 5 8 sampling and preparation of sample 5 9 Test Step 5 10 Calculate 6 11 Test Report 8 Appendix A (normative) Preparation and analysis of copper ethylenediamine (CED) solution Appendix B (normative appendix) [η] × ρ value 12 corresponding to different viscosity ratios ηratio

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 1548-2004 "Determination of pulp viscosity", compared with GB/T 1548-2004 main changes are as follows. --- modified the standard name; The diameter of the calibrated capillary viscometer is changed from (0.57 ± 0.02) mm to (0.58 ± 0.02) mm; --- constant temperature water bath temperature control accuracy from ± 1 ℃ to ± 0.1 ℃; --- timer accuracy from 1s to 0.1s; --- modified the sample preparation method; --- increase the high intrinsic viscosity value of the sampling requirements; --- increase the concentration of pulp in dilute solution calculation; --- increase the degree of polymerization and calculation methods; --- modified the results of the intrinsic viscosity value; - Reagents and methods for preparing copper ethylenediamine (CED) solutions are adjusted. This standard adopts the re-drafting method to modify the intrinsic viscosity value of ISO 5351..2010 "pulp copper ethylenediamine (CED) solution Determination ". The technical differences between this standard and ISO 5351..2010 are as follows. --- on the normative reference documents, this standard has made a technical differences in the adjustment to meet China's technical conditions, the adjustment of the situation Is reflected in Chapter 2, "normative reference documents", the specific adjustments are as follows. Replace GB 638 with GB/T 462 with international standard; Replace ISO 7213 with equivalent GB/T 740 with international standard. - increased terminology and definition of degree of aggregation (see 3.6); --- deleted 5.5, the standard is not involved; --- Deleted 5.6, 7.4 and Chapter 11, because this standard does not provide a capillary tester with automatic timer; --- delete the suspension section in 6.1; - Chapter 8, Chapter 9 adds the secondary bar; --- Corrected 10.3 Calculation example formula error number; --- increase the concentration of pulp in dilute solution calculation; --- increase the degree of polymerization calculation method; The information is attached to appendix C. Please note that some of the contents of this document may involve patents. The issuer of this document does not assume responsibility for the identification of these patents. This standard is proposed by the China Light Industry Federation. This standard by the National Paper Industry Standardization Technical Committee (SAC/TC141) centralized. The drafting of this standard. Zhejiang Kane Special Materials Co., Ltd., China Pulp and Paper Research Institute, the national paper quality supervision and inspection center. The main drafters of this standard. Cui Liguo, Gao Jun, Chen Wanping, Wang Xingxiang, Yin Qiao, Zhang Yue, Zhang Chengwei, Li Dafang. This standard replaced the previous version of the standard release. GB/T 1548-1979, GB/T 1548-1989, GB/T 1548-2004. Properties of Pulp Copper Ethylenediamine (CED) Solution Determination of viscosity values

1 Scope

This standard specifies the method for the determination of the intrinsic viscosity value of the pulp in the copper ethylenediamine (CED) solution and the calculation method of the degree of polymerization. This standard is applicable to bleached chemical pulp soluble in copper ethylenediamine (CED) solution and is suitable for use in completely soluble in copper ethylenediamine (CED) Liquid of all kinds of pulp. Note 1. The results can be used to evaluate the effect of cooking or bleaching on the degradation of cellulose, but when the sample contains a large amount of non-cellulosic material, Detailed description. Note 2. In strict terms, this viscosity measurement method is only used for the sample of the polysaccharide component and is suitable for the determination of the intrinsic viscosity of the pulp having a lignin content of less than 0.5%. this method For the determination of unbleached pulp with a lignin content of between 0.5% and 4.0%, although most of the ingredients of the pulp can be completely dissolved in copper ethylenediamine (CED) Solution after the test, but the test results are not strictly in the sense of the intrinsic viscosity value.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. GB/T 462 Paper, board and pulp analysis Sample moisture determination (GB/T 462-2008, ISO 287. 1985, ISO 638. 1978, MOD) GB/T 740 Pulp samples taken (GB/T 740-2003, ISO 7213..1991, IDT)

3 terms and definitions

The following terms and definitions apply to this document. 3.1 Shear rate The velocity gradient of the fluid layer parallel to the flow direction of the capillary inner surface is calculated according to equation (1) G = 4V πr3tf (1) Where. G - the shear rate of the solution in seconds (s-1); V - Viscometer The volume between two calibration scales in milliliters (mL); r - capillary radius in centimeters (cm); tf - solution outflow time in seconds (s). 3.2 Viscosity ratio ηratio At the same temperature, the viscosity (η) of the polymer solution of a certain concentration and the viscosity (η0) of the solvent, the viscosity ratio is not dimensionally, ......

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