GB/T 33818-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 33818-2017 | English | 150 |
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Carbon nanotube conductive paste
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GB/T 33818-2017: Carbon nanotube conductive paste---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/GBT33818-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.100.20
G 13
Carbon nanotube conductive paste
Issued on. MAY 31, 2017
Implemented on. DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Requirements... 6
5 Test methods... 7
6 Inspection rules... 10
7 Marking, packaging, transportation, storage... 12
8 Content of order sheet... 13
Appendix A (Informative) Determination of magnetic foreign matters content 15
Appendix B (Informative) Determination of the content of soluble metal
impurities... 17
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Chinese Academy of Science.
This standard is under the jurisdiction of the Sub Technical Committee of Nano-
material (TC279/SC1) of the National Technical Standardization Committee of
Nanotechnology.
The drafting organizations of this standard. Beijing Cnano Technology Limited,
Shenzhen BTR Nano Technology Co., Ltd., Hefei Guoxuan High-tech power energy
Co. Ltd., Cnano (Zhenjiang) Material Technology Ltd, Shenzhen Jinzhaoshidai New
Energy Technology Co. Ltd, Metallurgical Industry Information Standards Institute, etc.
The main drafters of this standard. Mao Ou, Yan Yan, Mei Jia, Xu Xiaoming, Feng
Guanghui, Li Xiaojun, Cha Xiufang, He Chihuan, Lv Xue, Li Weidong, Dai Shifeng.
Carbon nanotube conductive paste
1 Scope
This standard specifies the terms, requirements and testing methods and rules, as well
as marking, packaging, transportation, storage and order contents of carbon nanotube
conductive paste.
This standard applies to quality inspection and acceptance of liquid phase system
products using multi-walled carbon nanotubes as conductive medium in the fields of
lithium ion batteries, conductive coatings and conductive adhesives, etc. Single wall
carbon nanotubes paste products can be implemented with reference to this standard.
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 606 Chemical reagent - General method for the determination of water - Karl
Fischer method
GB/T 1725 Paints, varnishes and plastics - Determination of non-volatile-matter
content
GB/T 6753.1 Paints, varnishes and printing inks. Determination of fineness of grind
GB/T 22235-2008 Determination for viscosity of liquids
GB/T 24490 Test method for purity of multi-walled carbon nanotubes
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Carbon nanotube; CNT
Nanotubes made of carbon atoms.
3.2 Multi-walled carbon nanotubes; MWCNTs
The graphite sheets with three layers and above are curled into a coaxial nested quasi-
one-dimensional tubular carbon nanomaterial.
3.3 Carbon nanotube conductive paste
A multiphase mixture that is consisted of carbon nanotube as the main solid component,
that acts as a conductive medium, and that is composed with certain liquid.
4 Requirements
4.1 Principles
Carbon nanotube technical requirements include general technical requirements and
additional requirements for specific application fields. Carbon nanotube paste, on the
basis of meeting the general technical requirements, should also comply to the
appropriate additional technical requirements chosen by both supply-demand parties
as per the use of this product.
4.2 General technical requirements
4.3 Additional technical requirements (applicable to the field of lithium ion
batteries)
4.3.1 The viscosity value of the paste should be provided by the supplier after the
calibration of the standard sample.
4.3.2 The total content of magnetic foreign matters (Fe, Cr, Ni, Zn, Co) in the paste
should not exceed 0.002% (mass fraction) of the carbon tube content.
4.3.4 The water content in the anhydrous system should not be more than 2000 *10-6
(mass fraction). If the user has special requirements, it may be determined by
consultation of both supply-demand parties.
4.3.5 The pH value of water-based paste should generally be within the range of
5.0~9.0.
5 Test methods
5.1 Appearance
Visual inspection.
5.2 Solid content
Measure and calculate as per GB/T 1725.
5.3 Content of carbon nanotubes
5.5 Transmittance
5.5.1 Instruments and materials
Ultrasonic cleaner, UV-VIS spectrophotometer, high speed mixer (maximum speed at
least 3000rpm), cuvette and other auxiliary appliances.
5.5.2 Pre-test preparation
5.5.2.1 Use the ultrasonic cleaner to clean the 1cm cuvette liquid pool and the glass
instruments to be used, and dry them.
5.5.2.2 Turn on the UV-VIS spectrophotometer, which can be used to measure after
stabilizing for 30min, and set the wavelength to 546nm.
5.5.3 Test steps
5.5.3.4 Seal the diluted solution and stir it at the speed of 3000r/min for 30min± 0.1min,
and then, after the stirring, place it for settlement for 10min.
5.5.3.5 Suck the supernatant with a suction tube to clean the cuvette pool, and wipe
clean the outer wall of the pool with lens wiping paper.
5.5.3.6 Suck again the supernatant, put it into the liquid pool with the suction tube. The
liquid level is 2/3 of the height of the cuvette pool, then place it in the UV-VIS
spectrophotometer. Read the transmittance value after the value is stable.
5.5.4 Result calculation
5.6 Volume resistivity
5.6.1 Instruments and materials
Four-probe resistivity meter, air dry oven, press machine, glass plate, standard scraper
coater, high temperature resistant polyester film (PET film) and other auxiliary tools.
5.6.2 Preparation of sample slice
5.6.2.1 Seal the sample in a self-sealing bag, then stir for 5min with a glass bar to
make the paste in an even state.
5.6.2.5 Use a spiral micrometer to measure the thickness of the compacted paste on
the sample film. Measure 3 different points and take the average value.
5.6.2.6 Use the four-probe resistivity meter to test the volume resistivity of the sample,
select the appropriate range, input the thickness of the paste and the diameter of the
wafer (15mm) to the parameter settings of the tester, other parameters are
automatically selected by the tester.
5.6.3 Result calculation
5.7 Viscosity
It is measured according to the requirements of rotary viscosity measurement method
in GB/T 22235-2008.
5.8 Magnetic foreign matters content
This test shall be determined through consultation of both supply-demand parties. After
consultation, it can also be carried out in accordance with the method in Appendix A.
5.11 pH value
It is determined according to the requirements in QB/T 2303.10.
6 Inspection rules
6.1 Grouping of batches
6.2 Sampling quantity
At least 3 samples per batch.
6.3 Test items
6.3.1 Test classification
The product inspection stipulated in this standard is divided into batch inspection and
type inspection.
6.3.2 Batch inspection
6.3.3 Type inspection
When the type inspection is in the case of any of the following circumstances, all the
technical requirements stipulated in this standard should be tested.
6.3.4 Items of batch inspection and type inspection
See Table 1 (example of lithium ion battery applications).
6.4 Inspection and acceptance
6.4.1 Products shall be inspected by the supplier's quality supervision department to
ensure that the quality of the product meets the requirements of this standard or order
contract, and the quality certificate should be filled in.
6.4.2 When the paste product is not qualified in appearance inspection, the quality of
the products is deemed not qualified.
6.4.3 If the paste product is not qualified in any test of the composition, fineness,
relative absorbance and the conductivity etc., the product is not qualified.
7 Marking, packaging, transportation, storage
7.1 Packing and marking
7.1.1 After inspection, the qualified products are packed generally 20L~50L as a
package. The packing should be tight; the outer wall of the packing bucket should be
labeled with exit-warehouse label with information as follows.
7.1.2 If the customer has specific requirements, corresponding packaging and logo
design can be carried out.
7.1.3 When supplied, every batch of products should be accompanied with the < carbon
nanotubes conductive paste inspection report >, with content including the relevant
technical parameters of the batch products.
7.1.4 Each batch of products is accompanied by < shipping list>, with content including
but not limited to the following items.
7.2 Transport and storage
7.2.1 The product is suitable for storage at normal ambient temperature. The
warehouse should be ventilated and dry. Under the required condition of packing and
storage, the quality guarantee period should be no longer than 12 months from the
date of production.
8 Content of order sheet
The order sheet should include, but not limited to, the following.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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