Some standard content:
Electronic Industry Standard of the People's Republic of China
SJ/T10556-94
Exterior collidal graphite
for black and white picture tubesPublished on August 8, 1994
Implemented on December 1, 1994
Published by the Ministry of Electronics Industry of the People's Republic of China Electronic Industry Standard of the People's Republic of China
Exterior collidal graphite
for black and white picture tubes1 Subject Content and Scope of Application
SJ/T10556-94
1.1 This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of external conductive graphite emulsion for black and white picture tubes.
1.2 This standard applies to external conductive graphite emulsion for black and white picture tubes (hereinafter referred to as the product). 2 Technical requirements
2.1 The product appearance should be a black suspension, without bubbles, lumps, or irritating odor. 2.2
The technical performance of the product should comply with the requirements of Table 1. Table 1
Test method
Solid content, %
Particle size, μm
Viscosity, mpa, 5
Adhesion, %
Moisture resistance, %
Resistivity, a, cm
PH value,
25℃, a is the central value, agreed upon by both the supplier and the buyer. 3.1 The appearance quality of the product in Article 2.1 shall be visually inspected. The determination of the solid content of the product in Article 2.2.1 shall be carried out in accordance with Appendix A (Supplement). 3.2
3.3 The determination of the particle size of the product in Article 2.2.2 shall be carried out in accordance with Appendix B (Supplement). 3.4 The viscosity of the product in 2.2.3 shall be determined in accordance with Appendix C (supplement). 3.5 The adhesion of the product in 2.2.4 shall be determined in accordance with Appendix D (supplement). 3.6 The moisture resistance of the product in 2.2.5 shall be determined in accordance with Appendix E (supplement). Approved by the Ministry of Electronics Industry of the People's Republic of China on 1994-08-08 and implemented on 1994-12-01
SJ/T10556-94
3.7 The resistivity of the product in 2.2.6 shall be determined in accordance with Appendix F (supplement). 3.8 The pH value of the product in 2.2.7 shall be determined in accordance with Appendix G (supplement). 4 Inspection Rules
4.1 The product shall be inspected by the supplier's quality inspection department in accordance with the requirements of this standard to ensure that the product meets the requirements of this standard. 4.2 The purchaser shall accept the product in accordance with this standard within 2 months from the date of receipt. If the re-inspection result does not conform to the provisions of this standard, the two parties shall negotiate to resolve the problem.
4.3 Each inspection batch consists of the same type of products produced continuously with the same ingredients and the same process, and the weight of each batch should not exceed 600kg.
4.4 In each inspection batch, take 1 bottle or 1 barrel at random, roll it for 6 to 8 hours, sample 200g, sample according to the test requirements, put it into a volumetric bottle, and inspect it according to the various indicators specified in this standard. If one indicator is unqualified, double the sampling and re-inspect the unqualified item. If the re-inspection result is still unqualified, the product is an unqualified product. 4.5 When it is found that the submitted batch of products is unqualified, the delivery should be stopped immediately. Find out the cause of the unqualified and take corrective measures before continuing to leave the factory.
5 Marking, packaging, transportation and storage
5.1 Marking
5.1.1 The outer packaging of the product should be labeled with a label (label) and indicate: a.
Manufacturer name;
Product brand and specifications;
Product batch number:
Factory date;
Net weight of the product.
5.1.2 The inner packaging should be labeled with the following: a.
Manufacturer name;
Product name;
Product brand and specifications;
Batch number, net weight, production date;
Results of various analytical tests and stamps of the technical department; f.
Number of this standard:
Packaging date.
5.2 Packaging
The product should be packed in clean and dry polyethylene plastic drums or plastic square drums, and then packed in cartons or wooden boxes. 5.3 Transportation
During transportation, please be careful to place with care, prevent pressure, collision, rain and freezing, and do not invert. In winter, insulation measures should be taken for transportation, and it should not be mixed with acids, alkalis and surfactants during transportation. 5.4 Storage
5.4.1 The product should be stored in a dry room, and the bottle cap should not be opened when not in use. 5.4.2 The storage period of the product is six months from the date of leaving the factory. 2
Instruments and equipment
Balance, accuracy 0.1mg;
SJ/T10556--94
Appendix A
Determination of solid content
(Supplement)
Electric drying oven: working temperature 105~110℃; b.
Hydraulic motor: SA-31 or equipment with similar performance. Sample preparation
Put the sample bottle into the rolling machine and roll it according to the following conditions: Rolling direction to the outer periphery of the sample bottle;
Rolling speed 120±10r/min;
Rolling time 6~8h.
A3 Test steps
A3.1 Take 2 samples of 1-2g after rolling evenly, put them into 30ml porcelain that has been dried to constant weight, and place them in an electric drying oven at 105-110℃ to dry until constant weight.
A3.2 Weigh the mass of the crucible respectively (g); the mass of the sample and (g): the mass of the solid matter and crucible after drying (g). A4 Calculation
A4.1 Solid content X. Calculate according to the following formula: x, mm×100%..
Where: m-the mass of the empty crucible dried to constant weight, g: ml-the mass of the sample and, g
(A,)
m2-the mass of the solid matter and crucible after drying·g. A4.2 Take the arithmetic mean of the results of the two parallel samples as the test result. When the solid content is greater than 15%, the difference between the two measured values shall not exceed 0.4%, otherwise the third sample shall be measured, and the result calculated from the two measured values that do not exceed the tolerance shall be used as the experimental result.
Instruments, Equipment and Materials
SJ/T10556--94
Appendix B
Method for Determination of Particle Size
(Supplement)
Optical microscope (working conditions 1000 times); a.
20% NNO (sodium methylene bis-naphthalene sulfonate) solution; glass slide 76mm×26mm.
Determination Method
Use a glass rod to dip a drop of the rolled sample and drop it on the glass slide. Use 20% NNO solution as a dispersant and use a glass rod to evenly disperse the graphite emulsion. Place the slide under an optical microscope, observe with a micrometer, and use the general microscope particle determination method to measure the number of particles with the largest particle size, and calculate the average percentage of the number of particles with the specified particle size. Appendix C
Viscosity determination method
(Supplement)
C1 Instruments and equipment
a Viscometer NDJ-1 type rotary, viscometer or BL type rotary viscometer: b Constant temperature water bath: working temperature 25 ± 0.5℃; c. Stopwatch;
d. Thermometer.
C2 Test steps
C2.1 Roll the evenly rolled sample for another 10 minutes, take 250ml of the sample and place it in a 400ml tall beaker, put it in a constant temperature water bath (25±0.5℃), put in a viscometer (2 rotors, speed 30r/min) and prepare for no more than 5 minutes. After 30 seconds, press down the clamping rod and turn off the motor at the same time, and read the value (accuracy is 0.1 scale). C2.2 Measure the second sample in the same way as above. C3 Result calculation
C3.1 The viscosity value n is calculated as follows
n=αx10
Wherein: n--viscosity (mPa.s);
a-viscometer reading;
10-viscometer coefficient
·(C1)
C3.2 The relative deviation of the two measured values shall not exceed 3%, otherwise a third measurement shall be carried out, and the arithmetic mean value of the relative deviation of the two measured values shall not exceed 3% shall be taken as the measurement result. Appendix D
Method for determination of adhesion
(Supplement)
D1 Materials and instrumentsbzxz.net
Blade;
Steel ruler;
Tape (width 13mm) (Panda brand, or brand with the same adhesive force); d.
Roller.
Test steps
Draw 11 lines horizontally and vertically on the center of the coating film of the two prepared test pieces, intersecting vertically, with a line spacing of a.
1mm, to form 100 small squares;
b. Gently stick the tape on the small squares of the test piece, and roll it back and forth with a 2kg roller. After rolling, pull one end of the tape at 45° and peel off the tape within one second. Record the number of small squares peeled off and measure twice. Take the average value. D3 Calculate the adhesion force X according to the following formula:
X=100-n
Where: n is the number of squares adhered to the tape. Appendix E
Determination method of moisture resistance
(Supplement)
E1 Test method
Put the three test pieces after resistivity test in water at room temperature and soak for 24 hours. Take them out and dry them naturally. Then move them into an electric drying oven at 105-110℃ and bake them for 10 minutes. Take them out and cool them down. Then measure them according to the method in Appendix D. E2 Calculation
Moisture resistance Xz is calculated according to the following formula
Where: n is the number of squares adhered to the tape. .(E1)
F1Instruments and materials
Balance accuracy 0.1mg
SJ/T10556--94
Appendix F
Method for determination of resistivity
(Supplement)
Electric drying oven working temperature 105~110℃; c
Multimeter or DC bridge;
Spray gun caliber 1~2mm;
Mercury electrode:
Spraying rack;
Wolf hair flat brush width 30mm;
Tape (Panda brand or brand with the same adhesive strength) width 13mm; Glass slide 76mm×26mm;
Copper sheet 26mm×10mm.
F2 Test steps
F2.1 Sample preparation Take 5 slides (3 for resistivity test and 2 for adhesion test), clean them with gauze, number them, weigh them (accurate to 0.0001g), record the mass of each slide, and apply the rolled graphite emulsion on the slide by spraying or brushing.
F2.1.1 Spraying method (Method A): Spray the rolled sample according to the following conditions. The slide is tilted at 20°. The spray gun sprays 4 times (two round trips) on the slide at a distance of 200mm at a pressure of 0.3-0.4mpa and a speed of 200mm/s. After natural drying, move it into a 105110C electric drying oven for drying for 10min, take it out and put it into a dryer for cooling for 10min and weigh it. The coating mass should be within the range of 0.05-0.089, otherwise it needs to be re-made. F2.1.2 Brush coating method (B method) Brush the rolled sample evenly on the slide, move it into the electric drying oven at 105-110℃ and dry it for 15 minutes, take it out and put it into the dryer, cool it for 10 minutes, and the coating quality is 0.05-0.089. F2.2 Determination steps
F2.2.1A method (secondary loading method)
Put the coating test piece (coated surface facing down) horizontally on the mercury electrode, the electrode distance is 40mm, so that the coating is in contact with the mercury, add a 50g weight in the center of the test piece, use a multimeter or DC bridge to measure the coating resistance (accurate to the ohm value reading), move the test piece left and right 2mm, measure it twice, and take the average value. F2.2.2.B Method
Attach two copper sheets at both ends of the coating test piece, 40mm apart, clamp them with a clip, then use a multimeter or DC bridge to measure the coating resistance, accurate to the ohm reading, move the test piece left and right 2mm, measure twice and take the average value. F3 Calculation
The resistivity e is calculated as follows:
Where: R—
Coating resistance
M-Coating mass
D-—Coating density
L—Coating length, cm
LElectrode distance, cm.
Instruments and equipment
SJ/T10556-94
Appendix G
Determination method of pH value
(Supplement)
Acidity meter, PHS-4 type or other types of acidity meter: b glass electrode;
Calomel electrode
Test steps
Take 50ml of the mixed sample, place it in a 100ml drying cup, adjust the temperature to 25±1℃, place it on the acidity agent for measurement, read the reading, keep one digit after the decimal point. Measure twice, and take the average value as the pH value. Additional notes:
This standard is under the jurisdiction of the Electronic Standardization Institute of the Ministry of Electronics Industry. This standard was drafted by Danyang Electronic Materials Factory, the Standardization Institute of the Ministry of Electronics Industry, and Factory 741. The main drafters of this standard: Gong Chunlong, Gong Juemin, Gong Sicai, Han Yanfen, Yu Yaozhong7Method B
Attach two copper sheets at both ends of the coating test piece, 40mm apart, clamp them with a clip, then use a multimeter or DC bridge to measure the coating resistance, accurately to the ohm reading, move the test piece left and right 2mm, measure twice and take the average value. F3 calculation
The resistivity e is calculated as follows:
Where: R—
Coating resistance
M-Coating mass
D-—Coating density
L—Coating length, cm
LElectrode distance, cm.
Instruments and equipment
SJ/T10556-94
Appendix G
Determination method of pH value
(Supplement)
Acidity meter, PHS-4 type or other types of acidity meter: b glass electrode;
Calomel electrode
Test steps
Take 50ml of the mixed sample, place it in a 100ml drying cup, adjust the temperature to 25±1℃, place it on the acidity agent for measurement, read the reading, keep one digit after the decimal point. Measure twice, and take the average value as the pH value. Additional notes:
This standard is under the jurisdiction of the Electronic Standardization Institute of the Ministry of Electronics Industry. This standard was drafted by Danyang Electronic Materials Factory, the Standardization Institute of the Ministry of Electronics Industry, and Factory 741. The main drafters of this standard: Gong Chunlong, Gong Juemin, Gong Sicai, Han Yanfen, Yu Yaozhong7Method B
Attach two copper sheets at both ends of the coating test piece, 40mm apart, clamp them with a clip, then use a multimeter or DC bridge to measure the coating resistance, accurately to the ohm reading, move the test piece left and right 2mm, measure twice and take the average value. F3 calculation
The resistivity e is calculated as follows:
Where: R—
Coating resistance
M-Coating mass
D-—Coating density
L—Coating length, cm
LElectrode distance, cm.
Instruments and equipment
SJ/T10556-94
Appendix G
Determination method of pH value
(Supplement)
Acidity meter, PHS-4 type or other types of acidity meter: b glass electrode;
Calomel electrode
Test steps
Take 50ml of the mixed sample, place it in a 100ml drying cup, adjust the temperature to 25±1℃, place it on the acidity agent for measurement, read the reading, keep one digit after the decimal point. Measure twice, and take the average value as the pH value. Additional notes:
This standard is under the jurisdiction of the Electronic Standardization Institute of the Ministry of Electronics Industry. This standard was drafted by Danyang Electronic Materials Factory, the Standardization Institute of the Ministry of Electronics Industry, and Factory 741. The main drafters of this standard: Gong Chunlong, Gong Juemin, Gong Sicai, Han Yanfen, Yu Yaozhong7
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