GB/T 3780.18-2017 English PDF (GBT3780.18-2017)

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GB/T 3780.18-2017: Carbon black -- Part 18: Standard test methods for evaluation in Natural Rubber (NR)
GB/T 3780.18-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.040.20
G 49
Replacing GB/T 3780.18-2007
Carbon Black - Part 18. Standard Test
Methods for Evaluation in Natural Rubber (NR)
ISSUED ON. NOVEMBER 01, 2017
IMPLEMENTED ON. MAY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Standard Test Formulations ... 6
4 Sample ... 6
5 Mixing Procedures ... 6
6 Preparation and Test of Vulcanized Test Piece ... 10
7 Precision ... 11
8 Test Report ... 12
Bibliography ... 13
Foreword
GB/T 3780 Carbon Black can be divided into the following parts.
--- Part 1. Test Method for Iodine Adsorption Number;
--- Part 2. Determination of Dibutyl Phthalate Absorption Number;
--- Part 4. Determination of Oil Absorption Number for Compressed Sample;
--- Part 5. Determination of Specific Surface Area - CTAB Test Method;
--- Part 6. Determination of Tinting Strength;
--- Part 7. Determination of pH Value;
--- Part 8. Determination of Heating Loss;
--- Part 10. Determination of Ash;
--- Part 12. Inspection of Impurity Material;
--- Part 14. Determination of Sulfur Content;
--- Part 15. Determination of Light Transmittance of Toluene Extract;
--- Part 17. Indirect Determination of Particle Size - Reflectance Method;
--- Part 18. Standard Test Methods for Evaluation in Natural Rubber (NR);
--- Part 21. Determination of Sieve Residue - Water Flushing Method;
--- Part 22. Calculation of Process Indexes from an Analysis of Process Control
Data;
--- Part 23. Sampling and Testing of Carbon Black Fugitive Emissions or Other
Environmental Particulate;
--- Part 24. Determination of Void Volume.
This Part belongs to Part 18 of GB/T 3780.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 3780.18-2007 Carbon Black - Part 18. Standard Test Methods
for Evaluation in Natural Rubber (NR); compared with GB/T 3780.18-2007, this Part
has the major changes as follows.
Carbon Black - Part 18. Standard Test
Methods for Evaluation in Natural Rubber (NR)
WARNINGS. Personnel using this Part shall have practical working experience
in the formal laboratory. This Part does not address all the possible security
issues. The users are responsible to take appropriate safety and health
measures; and ensure the compliance with conditions set by relevant national
regulations.
1 Scope
This Part of GB/T 3780 specifies the rubber ingredients, test formulations, compound
mixing procedures and test methods for identifying the physical and mechanical
properties of carbon black in natural rubber.
This Part is applicable to identify various types of rubber carbon black.
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 document.
GB/T 528 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress-
Strain Properties
GB/T 3778 Carbon Black for Use in Rubber Products
GB/T 6038 Rubber Test Mixes - Preparation , Mixing and Vulcanization -
Equipment And Procedures
GB/T 9869 Rubber - Measurement of Vulcanization Characteristics with the
Oscillating Disc Cure Meter
HG/T 2725 Standard Practice for Carbon Black - Sampling Bulk Shipments
15) Mixing 1.5 3.0
Total 3.0
5.4.2 Turn off the motor; lift the top plug; discharge from the mixing chamber. If
necessary, record the rubber compound temperature.
5.4.3 Start the open mill at the room temperature; adjust the roll gap to 0.8mm; fold the
rubber compound and pass it to the open mill for 5 times above; keep the rolling
direction consistent for each time.
5.4.4 Review the mass of the rubber compound; if the mass of the rubber compound
exceeds 64.12g ~ 64.76g, such rubber compound shall be discarded.
5.4.5 If a stress-strain test is required, the thickness of rubber compounding falling
sheet shall be controlled at about 2.2mm.
5.4.6 If it is required to perform the vulcanization characteristics test as per the test
method of GB/T 9869; the thickness of rubber compound falling sheet shall be
controlled at about 6mm.
5.4.7 Place the rubber sheet on a flat and dry metal plate; stand for 1h ~ 24h at
(23±2) °C; the relative humidity shall be controlled at (50±10) %; otherwise, store the
rubber sheet into the cool and sealed container and prevent moisture absorption.
6 Preparation and Test of Vulcanized Test Piece
6.1 The preparation and vulcanization of vulcanized sheet for stress-strain test shall
be performed as per the following procedures (see GB/T 6038).
a) The vulcanization mod shall be designed as per the test piece size of
150mm×150mm×2mm; cut the rubber sheet (5.2.5, 5.3.4, 5.4.7) into the rubber
test piece with length and width 3mm less than that of the vulcanization mold;
mark the specimen name, specimen number, rolling direction. Each piece of
rubber sheet shall be weighed to be (54±1) g.
b) Adjust the temperature of vulcanizer (GB/T 6038) plate to be (145±1) °C.
c) Place the mold (6.1.1) in an appropriate position of the vulcanized flat plate (GB/T
6038); after pre-heating 20min, quick mold vulcanization.
d) After mold is applied, when the pressure applied to the mold meets the
requirement (GB/T 6038), immediately time it; the vulcanization time error is
allowed to be 20s.
e) Vulcanization time. S series carbon black is 50min; other carbon black is 30min.
The difference between two independent test results under reproducibility condition of
300% tensile stress at a given elongation shall not exceed 1.37MPa; the tensile stress
shall not exceed 1.67MPa; the elongation at break shall not exceed 45.9%.
7.3 Micro internal mixer method – test method C
7.3.1 Repeatability
The difference between two independent test results obtained under repeatability
condition of 300% tensile stress at a given elongation shall not exceed 0.64MPa; the
tensile stress shall not exceed 0.62MPa; the elongation at break shall not exceed
28.7%.
7.3.2 Reproducibility
The difference between two independent test results under reproducibility condition of
300% tensile stress at a given elongation shall not exceed 1.07MPa; the tensile stress
shall not exceed 3.02MPa; the elongation at break shall not exceed 86.4%.
8 Test Report
The test report shall contain the following contents.
a) Specimen name and mark;
b) The standard on which this test is based;
c) Laboratory temperature and humidity;
d) The name of the used reference carbon black;
e) Rubber compound mixing method;
f) Test results;
g) Difference between the applied test procedures and the basic analysis
procedures;
h) Anomalies that occur during the test;
i) Test date.