This standard specifies the test method for determining the solid content, volatile matter, ash content and pH value of graphite emulsions for picture tubes. This standard is applicable to the determination of the solid content of graphite emulsions for color picture tubes and black picture tubes, the determination of the volatile content of graphite emulsions for the inner coating of the cone of color picture tubes, graphite emulsions for the neck of the tube, graphite emulsions for the pins and the conductive graphite emulsions for the inner coating of black and white picture tubes, the determination of the ash content of graphite emulsions for the neck of color picture tubes, ruthenium-pin graphite emulsions and graphite emulsions for the inner coating of the cone, and the determination of the pH value of graphite emulsions for the ink base of color picture tubes, graphite emulsions for the outer coating and the conductive graphite emulsions for the outer coating of black and white picture tubes. GB/T 15064.1-1994 Test method for graphite emulsions for picture tubes Test method for solid content, volatile matter, ash content and pH value GB/T15064.1-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for solid, volatile,
Ash content and pH value of colloidal graphite for klnescope Subject content and scope of application
GB/T 15064.1—94
This standard specifies the test method for determining the solid content, volatile matter, ash content and pH value of kinescope graphite emulsion. This standard is applicable to the determination of the solid content in graphite emulsions of color picture tubes and black-and-white picture tubes, the determination of the volatile content in graphite emulsions coated inside the cone of color picture tubes, graphite emulsions on the neck of tubes, graphite emulsions on pins, and conductive graphite emulsions inside black-and-white picture tubes, the determination of the ash content in graphite emulsions on the neck of color picture tubes, graphite emulsions on pins, and graphite emulsions coated inside the cone, and the determination of the pH value of graphite emulsions coated outside the bottom of color picture tubes and conductive graphite emulsions outside black-and-white picture tubes. 2 Instruments and Equipment
Balance: Sensitivity is 0.00019;
Drying oven: Temperature control range, room temperature ~ 250℃, c
High temperature electric furnace: Temperature control range, room temperature 1000℃; Acidity meter: Measuring range 0~14pH, minimum scale value 0.02pH, d.
Rolling machine: Speed ​​120±3r/min.
3 Sample preparationbZxz.net
Use a rolling machine to roll and mix the sample under the following conditions: Rolling method: in the direction of the outer circumference of the sample bottle;
Speed: 120±3r/min;
Rolling time: 10h.
4 Test steps and result calculation
4.1 Determination of solid content
4.1.1 After the sample is mixed, weigh 1~2g (accurate to 0.0001g) and place it on a porcelain or glass surface that has been dried to a constant weight. 4.1.2 Place the sample in a drying oven at 105~110℃ and dry it for the time specified in the table below. Approved by the State Bureau of Technical Supervision on April 18, 1994 and implemented on December 1, 1994
Color picture tube
Black and white picture tube
GB/T 15064.1-94
Black bottom graphite emulsion
Tube neck graphite emulsion
Pin graphite emulsion
External coating graphite emulsion
Cone internal coating graphite emulsion
External conductive graphite emulsion
Internal conductive graphite emulsion
4.1.3 After drying, the sample is placed in a desiccator and weighed after cooling to room temperature (accurate to 0.0001g). 4.1.4 The solid content X (%) of the graphite emulsion of the picture tube is calculated according to formula (1), retaining one decimal place: X,
Where: M—mass of the sample before drying, g; M, mass of the sample after drying, g.
Drying time
Dry to constant weight
4.1.5 Take the arithmetic mean of the test results of two parallel samples as the test result. The difference between the two test values ​​shall not exceed 0.2% when the solid content is less than or equal to 15%, and shall not exceed 0.4% when the solid content is greater than 15%. Otherwise, the third sample shall be tested and the test result shall be calculated based on the two test values ​​that do not exceed the difference.
4.2 Determination of volatile matter
4.2.1 Determination of volatile matter of graphite emulsion coated on the cone of color picture tube, graphite emulsion on the neck of tube, and graphite emulsion on pins 4.2.1.1 After mixing the sample, weigh about 30g of the sample, place it in a polytetrafluoroethylene evaporating dish, put it in a drying oven at 105-110℃, and dry it for 24h.
4.2.1.2 Grind the dried sample until it passes through a 0.5 mm sieve, place it in the original evaporating blood, place it in a drying oven at 150°C, dry it for 2 hours, then move it into a desiccator and cool it to room temperature. 4.2.1.3 Weigh about 0.5 g of the dried sample (accurate to 0.0001 g), place it in a porcelain crucible that has been burned at 950°C and has a constant weight, place it in an electric furnace at 250°C and bake it for 20 minutes, then heat it to 400°C and bake it for 40 minutes, take it out and place it in a desiccator, cool it to room temperature and weigh it (accurate to 0.0001 g). 4.2.2 Determination of volatile matter in conductive graphite emulsion in black-and-white picture tubes Place the dried sample after the solid matter is determined in 4.1.3 into an electric furnace at 420°C and bake it for 45 minutes, take it out and place it in a desiccator, cool it to room temperature and weigh it (accurate to 0.0001 g). 4.2.3 The volatile content X (%) of the kinescope graphite emulsion is calculated according to formula (2), retaining one decimal place: M, -M2
Where: M, - mass of the dry sample before firing, g, M2 - mass of the sample after firing, g.
4.2.4 Take the arithmetic mean of the test results of two parallel samples as the test result. The difference between the two measured values ​​shall not exceed 0.5%, otherwise the third sample shall be measured and the test result shall be calculated based on the two measured values ​​that do not exceed the difference. 4.3 Ash determination
GB/T 15064.1-94
Weigh 0.5g (accurate to 0.0001g) of the dry sample prepared in 4.2.1.2, place it in a porcelain that has been fired at 950℃ and has a constant weight, put it in a high-temperature electric furnace at 950℃, fire it for 3h, take it out and put it in a desiccator, cool it to room temperature and weigh it (accurate to 0.0001g). 4.3.2 The ash content X (%) of the kinescope graphite milk is calculated according to formula (3), and one decimal place is retained: M3
Where: M, - mass of the dry sample before ignition, g; M, mass of the residue after ignition, g.
4.3.3 Take the arithmetic mean of the results of two parallel samples as the test result. The difference between the two measured values ​​shall not exceed 0.5%. Otherwise, the third sample shall be measured and the test result shall be calculated based on the two measured values ​​that do not exceed the tolerance. 4.4 pH value determination
4.4.1 After mixing the sample according to the provisions of Chapter 3, measure about 50mL of the sample and place it in a 100mL beaker. 4.4.2 Determine the pH value of the sample according to the method of using the acidometer, record the measurement results, and take the average of the two parallel measurement results as the measurement result. Retain one decimal place.
Additional instructions:
This standard is proposed by the Standardization Research Institute of the State Building Materials Bureau. This standard is under the jurisdiction of Shandong Nanshu Graphite Mine. This standard was drafted by Shandong Nanshu Graphite Mine and Weiyang Non-metallic Mineral Research Institute of the State Building Materials Bureau. The main drafters of this standard are Liu Huidong, Yan Zaijin, Zhang Youyuan and Liu Youhong.
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