GB/T 33818-2017 (GBT 33818-2017)

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GB/T 33818-2017
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.
3. No action is required - Full-copy of this standard will be automatically &
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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 ... 15 
Appendix B ... 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
GB/T 24491 Multi-walled carbon nanotubes
QB/T 2303.10 Paste coated paper separator for batteries. Part 10. Determination
of pH
3 Terms and definitions
The following terms and definitions apply to this document.
calibration of the standard sample.
4.3.2 The total content of magnetic foreign bodies (Fe, Cr, Ni, Zn, Co) in the paste
should not exceed 0.002% (mass fraction) of the carbon tube content.
4.3.3 The content of soluble metallic impurities (Fe, Cr, Ni, Cu, Zn, Co) in the paste
should not exceed 0.2% (mass fraction) of the carbon tube content. If the user has
special requirements, it may be determined by consultation of both supply-demand
parties.
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
5.3.1 Make a sample of dried paste according to the steps specified in 5.2.
5.3.2 Measure and calculate the content of carbon nanotubes in accordance with the
steps specified in GB/T 24490.
5.4 Paste fineness
Measure as per GB/T 6753.1.
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.
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.
5.6.2.2 Drop some ethanol on a clean glass plate, lay the PET film on the glass plate,
and wipe the PET film with paper to make the film tightly attach to the glass plate. Put
appropriate amount of paste sample on the PET film, use standard scraper coater (gap
200μm) to scrape the paste to be flat.
5.6.2.3 Place it in the air-dry oven at 80°C~120°C to dry for 1h~2h.
5.6.2.4 Cut the dried sample film into a thin wafer of 15mm diameter, make more than
2 pieces. Put it in the press machine, press 3min~5min under the sustained pressure
of 10t.
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
5.6.3.1 Tests 2 slices for the same sample. Each slice should be tested in 3 different
points for volume resistivity data. If the deviation between the two-test data is not more
than 10%, then the test data is valid.
5.6.3.2 Use the four-probe resistivity meter’s own software to process the data, get the
result, or directly take the arithmetic average value.
5.6.3.3 If the deviation between the two-test data is more than 10%, the test data is
invalid. Retest should be carried out; if necessary, the sample can be reproduced.
5.7 Viscosity
It is measured according to the requirements of rotary viscosity measurement method
in GB/T 22235-2008.
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.
6.4.4 The demand-party should inspect the received product according to this standard;
if the test result does not comply with this standard or the order contract, it should raise
the issue to the supplier within 15 days from the receipt date of the product, and seek
settlement through negotiation of both parties. If arbitration is required, arbitration shall
be conducted at the place of the demand-side with joint participation of both parties.
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.
a. Supply number (supply list number of the goods supplied);
b. The brand and name of the company;
c. Name and specification;
d. Date of production;
e. Contact information and address of the company.
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
A.3.2.2 Take out the magnetic rod, put it into a 250mL beaker, and add deionized water
to do ultrasonic cleaning for 30s. Wash 3 to 5 times until the cleaning liquid is clear
(After cleaning, the directly visually inspect the magnetic rod, carefully observe if the
magnetic rod surface has obvious metal particles; if obvious, this sample should be
paid special attention when ...