JB/T 10442.2-2004 Diamond-coated insulating paper for electrical use Part 2: Test methods
Some standard content:
ICS29.035.99
Machinery Industry Standard of the People's Republic of China
JB/T10442.22004
Insulating paper coaded with resin binder forming rhombic patternfor electrical purposes
Part 2: Method softest
Published on February 10, 2004
Implemented on June 1, 2004
Published by the National Development and Reform Commission of the People's Republic of ChinaForeword
Normative references
General requirements for tests
Firmness of base material
Electrical conductivity of water extract
pH value of water extract
Oil absorption,
Tensile strength and elongation at break||tt| |Tear strength,
adhesive strength,
breakdown voltage
pollution to transformer oil
JB/T10442.2-2004
JB/T10442.2—2004
JB/T10442 "Diamond-shaped Glue-coated Insulating Paper for Electrical Use" is divided into three parts: Part 1: Definitions and general requirements:
Part 2: Test methods;
Part 3: Single material diamond-shaped epoxy adhesive insulating paper This part is the second part of JB/T10442. This part is formulated for the first time.
This part is proposed by China Machinery Industry Federation. This part is under the jurisdiction of the National Technical Committee for Standardization of Insulating Materials. Drafting units of this part: Guilin Electric Science Research Institute, Nantong Hongan Sanmu Insulating Materials Co., Ltd., Leshan Ouda Insulating Materials Co., Ltd., Shenyang Transformer Co., Ltd. The main drafters of this part are Li Bingsong, Xuemei, Chen Kuan, Yang Heping, Lei Qiang and Xiao Fuming. 1 Scope
Electrical diamond-shaped glue-coated insulating paper
Part 2: Test methods
This part of JB/T10442 specifies the test methods for electrical diamond-shaped glue-coated insulating paper. This part is applicable to electrical diamond-shaped glue-coated insulating paper. 2 Normative references
JB/T10442.2-2004
The clauses in the following documents become the clauses of this part through reference in this part of JB/T10442. For any dated reference text, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced documents, the latest versions shall apply to this part.
GB/T455—2002 Determination of tear resistance of paper and paperboard (eqvISO1974:1990) GB/T1408.1—1999 Test method for electrical strength of solid insulating materials Test under power frequency (eqvIEC60243-1:1988) GB/T1545.2—1989 Determination of pH value of aqueous extract of paper, paperboard and pulp (eqvISO6588:1981) GB2536--1990 Transformer oil (eqvIEC60296:1982 )GB56541985 Measurement of power frequency relative dielectric constant, dielectric loss factor and volume resistivity of liquid insulating materials (negIEC60247:1978)
GB/T7196-1987 Test method for determination of ionic impurities in electrical insulating materials by liquid extraction (eqV[EC60589:1977) 3 General requirements for testing
Unless otherwise specified, the sample should be treated at 23℃±2℃ and relative humidity of 45%~55% for 16h and tested under the same conditions.
4 Appearance
Inspect by visual inspection under soft, scattered light. 5 Thickness
5.1 Equipment and instruments
Oven: Humidity control accuracy ±2℃:
Acetone: industrial pure.
Constant pressure thickness gauge: The diameter of the measuring surface of the upper measuring head is 16.0mm±0.5mm, and the lower measuring head should be larger than this value, so that the pressure measuring area during measurement is 2cm: The pressure applied to the sample is 100kPa±10kPa. The scale value of the measuring dial is 0.001mm, and the allowable estimated value of the reading is 0.0005mm. When calibrated with a calibration block, the measurement accuracy should be within 0.0005mm. 5.2 Material thickness measurement cover
Cut a full-width sample with a length of 30mm in the longitudinal direction, and use the constant pressure thickness gauge specified in 5.1 to measure nine points evenly spaced from about 20mm away from the edge of the sample, with an accuracy of 0.001mm. Take the median of the measured values as the material thickness result, and report the maximum and minimum values. 5.3 Measurement of substrate thickness
Soak the sample with measured thickness in about 300 mL of industrial acetone (or appropriate solvent specified in the product standard) in 5.2, take it out after 30 minutes, and repeat the soaking twice with new acetone, take it out to dry, and dry it in an oven at 80±2℃ for 30 minutes. After cooling to room temperature, measure the substrate thickness according to 5.2 or provide the original substrate sample or substrate thickness test data provided by the manufacturer. 5.4 Determination of single-sided adhesive thickness
5.4.1 Determination of adhesive thickness of single-sided adhesive products Subtract the median of the thickness measured in 5.3 from the median of the thickness measured in 5.2 to obtain the adhesive thickness of the single-sided adhesive product, expressed in um. 5.4.2 Determination of adhesive thickness of double-sided adhesive products Subtract the median value of the thickness measured in 5.3 from the median value of the thickness measured in 5.2 and divide by 2 to obtain the single-sided adhesive thickness of the double-sided adhesive product, expressed in um.
6 Substrate tightness
6.1 Instruments and tools
Analytical balance: Sensitivity is 0.001g:
Constant pressure thickness gauge: Same as 5.1:
Steel ruler: Graduation is 0.5mm:
Sample plate: 100mmX100mm.
6.2 Samples
Use a sampling plate to cut three 100mm×100mm samples evenly spaced at least 20mm from the edge of the paper roll. 6.3 Test procedure
6.3.1 Weigh the weight of each sample to the nearest 0.001g: and measure the length, width and thickness of the sample in mm. 6.3.2 Compactness is calculated according to formula (1):
Where:
a Compactness of the sample in g/cm:
Weight of the sample in g:
0i, b, h Length, width and thickness of the sample in mm6.4 Results
Take the median of the three tests as the substrate compactness result, and report the maximum and minimum values. 7 Moisture
Instruments and equipment
Analytical balance: Sensitivity 0.001g:
Oven: Temperature control accuracy ±2℃:
Sample container: Erlenmeyer flask with lid.
7.2 Sample
Take three samples of 50g each at intervals at least 20mm from the edge of the paper roll width. 7.3 Test procedure
7.3.1 Wash and dry the sample container and the lid, take it out and put it in a desiccator to cool to room temperature, then weigh it (m2), quickly put the sample in the container, seal it, and weigh it (m3).
7.3.2 Put the container with the sample in an oven at 105℃±2℃, open the lid (if necessary, take the sample out of the container and spread it in the oven). After 8h, cover it with the lid, take it out and put it in a desiccator to cool to room temperature, and weigh it (m4). In case of dispute, the operation can be repeated until constant weight is reached, that is, the difference between two consecutive measurements is not greater than 0.1%. 2
7.3.3 The moisture content is calculated according to formula (2): Where:
×100%
M---the moisture content of the sample, %:
The weight of the sample container, in g:
The weight of the sample container plus the sample plate before baking, in g: - The weight of the sample container plus the sample plate after baking, in g 7.4 Result
Take the median value of the three tests as the result, and report the maximum and minimum values accurately. To 0.1% 8 Ash content
8.1 Instruments and equipment
Balance: Sensitivity is 0.0001g
High temperature furnace: Temperature control accuracy ±25℃:
8.2 Sample
JB/T10442.2—2004
Same as 7.2, cut three samples of about 2g~5g, remove moisture according to the baking conditions for moisture measurement, or use 2g of dry sample that has not been damp after moisture measurement.
8.3 Test procedure
Pre-calculate the crucible at 925℃±25℃, take it out and put it in a desiccator. After cooling to room temperature, weigh it (ms), add the dried sample (m), burn it to carbonize, and then move it into a high-temperature furnace, burn it at 925℃±25℃ until there is no discolored carbon strand, take out the crucible, cool it in a desiccator and weigh it (ml). If necessary, repeat the burning until constant weight. All measurements should be accurate to 0.0001g: ash content is calculated according to formula (3):
Where:
A—sample ash content. %;
Weight of crucible, in g:
m/-msx100%
Weight of crucible plus sample before burning, in g:Weight of crucible plus sample after burning. In g. 8.4 Results
The median of the three tests shall be taken as the ash content result, and the maximum and minimum values shall be reported, accurate to 0.1% 9 Conductivity of water extract
Perform in accordance with 4.1 of GB/T7196-1987.
The median of the three tests shall be taken as the result of conductivity of water extract, and the maximum and minimum values shall be reported. 10 pH value of water extract
10.1 Instrument
pH value measuring instrument: accurate to o.1.
JB/T10442.2-2004
10.2 Preparation of water extract
Same as Chapter 9 of this part.
10.3 Determination of pH
According to 7.2 of GB/T1545.2-1989, accurate to 0.01.10.4 Results
Take the median of the three tests as the result of pH of the water extract, and report the maximum and minimum values, accurate to 0.1.11 Oil absorption
11.1 Apparatus, equipment and instruments
Analytical balance: sensitivity 0.001g:
Oven: temperature control accuracy ±2℃;
Sample container: stainless steel tank.
Transformer oil: in accordance with the requirements of GB2536.
11.2 Samples
Take three 75mm×75mm samples evenly spaced at least 20mm from the edge of the paper roll width. 11.3 Procedure
Put the sample in an oven, heat it to 105℃±2℃, keep it for 2h, take it out and put it in a desiccator to cool to room temperature, and weigh it (ms). Then dry it in an oven at 105℃±2℃ for 20min, take it out and immediately immerse it in transformer oil preheated to 90℃±2℃, then cool it. After 4h, take out the sample, quickly use filter paper to absorb the excess oil on the surface, and weigh it (m3). The oil absorption is calculated according to formula (4): mo-ms×100%
Where:
0 Oil absorption of the sample, %:
- Weight of the sample before oil absorption, in g:
Weight of the sample after oil absorption, in g.
11.4 Results
Take the median value of the three tests as the absorption result, and report the maximum and minimum values. 12 Tensile strength and elongation at break
12.1 Equipment
The constant speed mobile testing machine can be adjusted to make the specimen break in 20s ± 5s. It has a device for measuring and recording the tensile force and elongation. The graduation value can read 10% of the value required by the specification of a single material. 12.2 Specimens
12.2.1 Specimen size and quantity
The specimen length should be such that the distance between the two clamps of the testing machine is 200mm long. The width can be 15mm, 25mm or 50mm, with an allowable deviation of -0.1mm~+0.2mm. The number is nine in each direction. 12.2.2 Sampling method
The longitudinal specimens should be sampled evenly along the width at a distance of more than 20mm from the edge. The transverse specimens should also not be sampled at the same virtual latitude. 12.3 Test procedure
Fix the specimen in the clamps, and keep the distance between the clamps 200mm. Select the test speed and conduct the test, record the tensile force (F) and elongation (△L) when the sample breaks. The sample must break within 20s ± 5s, otherwise the test speed should be adjusted. If the sample breaks in the chuck 4
or at the chuck, the result is invalid and the sample needs to be retested. The tensile strength is calculated according to formula (5):
Where:
T tensile strength of the sample, unit is kN/m
F, the maximum tensile force that the sample can withstand, unit is N: b2——sample width, unit is mm.
Elongation is calculated according to formula (6):
Where:
E—elongation when the sample breaks, %:
AL length increase when the sample breaks, unit is mm; L-starting distance of the sample between the clamps, unit is mm. 12.4 Results
JB/T10442.2—-2004
(5)
The median of the nine test data in each direction is taken as the result of tensile strength or elongation at break, and the maximum and minimum values are reported. 13 Tear strengthbzxZ.net
Perform according to GB/T455.1. Nine tests are conducted in the longitudinal and transverse directions, and the median of the test values in each direction is taken as the result of tear strength, and the maximum and minimum values are reported.
14 Adhesion strength
14.1 Equipment and instruments
Oven: Temperature control accuracy ±2℃:
The speed of the constant speed mobile material testing machine can be adjusted to 5mm/min, and the graduation value is 10% of the value required by the single material specification, and it is equipped with a test heating box with a temperature control accuracy of ±2℃.
14.2 Preparation of specimens
Two flat, smooth and clean aluminum or copper plates with a thickness of 0.5mm to 1.0mm, a width of 50mm and a length of about 150mm are overlapped 50mm in the parallel long axis direction. Four layers of 50mm×50mm specimens are clamped at the overlap. A pressure of 15kPa is applied to the overlap surface. Curing is carried out according to the curing conditions specified in Part 3 of this standard (note that during operation, the metal plate wings should be strictly prevented from lifting and causing poor contact with the specimen or between specimens). Five specimens are prepared.
14.3 Test procedure
Fix the specimens prepared in accordance with 15.2 in the fixture, increase the load at a speed of 5mm/min, start the machine for testing, and record the maximum load (F,) when the specimen is sheared. If a high temperature test is performed, the specimen should be preheated for 30 minutes at the temperature specified in the product standard before the test.
The bond strength is calculated according to formula (7):
Wherein:
The bond strength of the specimen, in kPa:
(7)
JB/T10442.2—2004
F2—The maximum shear force that the specimen bears, in N. az, by
The length and width of the shear area of the specimen, in mm. 14.4 Results
The median of the five test values is taken as the result of the bond strength, and the maximum and minimum values are reported. 15 Breakdown voltage
Breakdown voltage is carried out in accordance with GB/T1408.1 and is specified as follows:a) The electrode is Φ25mm/g75mm, the voltage step-up method is the continuous voltage step-up method, and the weight of the upper electrode should be sufficient to flatten the bent sample so that the upper and lower electrodes can fully contact the sample:
Test in air, the sample should be dried at 105℃ for 2h and then cooled to room temperature for testing. During the test, it should be ensured that the sample does not absorb moisture again and have a significant impact on the test results: Test in oil, the sample is cured according to the curing conditions specified in Part 3 of this standard. Then the cured sample is quickly immersed in transformer oil at 90℃±2℃ in hot state, kept warm for 16h, and then cooled for breakdown test:d) The median value of the nine measured values is taken as the breakdown voltage result, and the maximum and minimum values are reported. 16 Contamination of transformer oil
16.1 Equipment and instruments
Test cell for determining liquid dielectric loss factor: should meet the requirements of GB/T5654. Container for sample preparation: a clean three-mouth container suitable for accommodating 75cm sample and 750mL insulating liquid, and convenient for measuring temperature and passing nitrogen flow.
Heating device: temperature control accuracy ±2℃
Nitrogen: high-pressure bottled.
Transformer oil: meet the requirements of GB2536.
16.2 Sample preparation
Cure the sample according to the specified curing conditions. Cut the cured sample into small pieces with a surface area of less than 1cm, a total of 75cm sample, put it in a container and inject 750mL transformer oil. In another container, add 750mL transformer oil, and then slowly pass nitrogen gas into the two containers to drive out the air in the containers and keep the containers in a nitrogen atmosphere. Heat to 100℃±2℃, keep for 96h, and then cool to 70℃±2℃. Cut off the oxygen flow and transfer the transformer oil to a liquid dielectric loss factor test pool preheated to 70℃±2℃. 16.3 Test basis
According to the provisions of GB/T5654, measure the dielectric loss factor of transformer oil at 70℃±2℃, 16.4 Results
The increase in dielectric loss factor of the sample oil to the blank oil is taken as the contamination of the transformer oil. 6
People's Republic of China
Mechanical Industry Standard
Electrical Diamond Grid Glued Insulating Paper
Part 2: Test Method
JB/T 10442.2--2004
Published and distributed by Machinery Industry Press
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Postal code: 100037
Format 890mm×1240mm
1/16·0.75 printing sheet·19,000 words
First edition, first printing in June 2004
Book number: 15111·7301
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