This standard specifies the test methods for the appearance, density, conditional viscosity, suspension, gas evolution and wear resistance of coatings for sand casting. This standard is applicable to the performance test of coatings diluted with water or organic solvents for sand casting. JB/T 5107-1991 Test methods for coatings for sand casting JB/T5107-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Sand casting coatings
Test methods
1 Subject content and scope of application
JB/T 5107..91
This standard specifies the test methods for the appearance, density, conditional viscosity, suspension, gas evolution and wear resistance of coatings for sand casting.
This standard is applicable to the performance test of coatings diluted with water or organic solvents for sand casting. 2 Reference standards
GB3186 Sampling of coating products
J34007 Test methods for investment casting coatings
3 Test methods
3.1 Preparation of samples
3.1.1 Sample containers and sampling equipment
Sample containers and sampling equipment shall comply with the provisions of Articles 2.1 and 2.2 of GB3186. 3.1.2 Sampling quantity
The sampling quantity shall comply with the provisions of GB3186.
3.1.3 Sampling
3.1.3.1 The paste material shall be taken from the upper part of the barrel and 300~~400 meters above the upper part. mm depth, and select equal quantities. For products with sediment, follow the provisions of 4.4.2.4 of (i133186). When unpacking the bag, the powder material is selected from the top and 100~150mm deep from the bag mouth in equal quantities. 3.1.3.2 The method of selecting samples is the "four-point method", and the sample weight should be not less than 1kg. 3.1.3.3 The marking, sealing, storage and use of samples shall comply with the provisions of GB3186. 3.1.4 Sample preparation
3.1.4.1 Inspection of the appearance of pastes and powders Visually inspect the selected samples for uniformity and inclusions under sufficient light conditions. , if there are inclusions, the difficulty of removing them should be recorded.
3.1.4.2 Paste dilution and powder dilution method Equipment: Laboratory electric mixer.
Operation: Weigh 500±1g of paint sample and dilute it with water or organic solvent to the use density (refer to Appendix A, Table 1 and 2). The density is determined in accordance with Article 3.2. Add water or organic solvent to the material barrel of the paint mixer, and add paste or powder in batches, stirring while adding. After the materials are added, the stirring time should be no less than 20 minutes, and the stirring time for powder should be no less than 40 minutes. The material is coated on a 75mm×25mm glass sheet, and the appearance of the coating is visually inspected. If there are impurities of undiluted coating in the coating, stirring should be continued until it is homogeneous. 3.2 Determination of coating densitybZxz.net
3.2.1 Apparatus
Use a Φ30mm scale with a 0~～100ml. ground stopper; approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 15, 1991, 516
implemented on July 1, 1992
balance (sensitivity is 0.01g)
3.2.2 Determination method
IB/T 5107-91
First weigh the mass of the cylinder (accurate to 0.01g), then add the paint prepared according to 3.1.4 and placed in a 20+:3 environment for 15min to the measuring cylinder, so that it reaches the 100ml mark, and then weigh it with the same accuracy. 3.2.3 Calculation of results
The density of the paint is calculated according to formula (1):
Where: α--…Density of paint g/cm\
m2---The mass of the measuring cylinder after filling:
m -\-The mass of the empty measuring cylinder·g.
3.3 Determination of conditional viscosity
The determination of conditional viscosity is in accordance with the provisions of 2.1 of JB4007. 3.4 Determination of suspension
3.4.1 Use a true
Use a 30mm scale with a mushroom II stopper and a 0-100ml scale. 3.4.2 Determination method
Pour the coating prepared according to 3.1.4 into a measuring cylinder to a height of 100 ml. In a static state, place the water-based coating for 6 hours and the organic solvent coating for 2 hours, and measure the volume of the clear layer. 3.4.3 Calculation of results
The suspension rate is calculated according to formula (2):
100 --V
Where: (---suspension rate of coating, olefin w
volume of the clear layer above the coating column in the test tube, ml. 3.5 Determination of coating appearance
(2)
Use 1 to determine the coating appearance. The actual used molding sand test block coated with coating is dried in an oven at 150±5℃ and kept warm for 1h. Check whether the coating is uniform and whether there are cracks, impurities, etc. 3.6 Determination of coating wear resistance
3.6.1 Apparatus
SUM type coating wear tester;
balance (sensitivity is 0.01g);
lower dryer.
3.6.2 Sample preparation
The sample matrix is ​​the actual used molding (core) sand, which is impacted 3 times on the SAC type hammer type sample making machine. Make a Φ50mm×55mm sample and dry or harden it according to the process of forming (core) sand. Apply or dip the coating prepared according to 3.1.4 evenly on the base sample 1:, the coating thickness is 1.0~1.5mm, put the sample into the oven, dry and keep warm at 150±5℃ for 1h, and put it in the desiccator after cooling. 3.6.3 Measurement steps
Turn on the power, clamp the sample on the fixture of the instrument, and gently wipe the outer surface of the sample with a soft brush. Adjust the counter to reach the value of 64r, and then reset it.
Press the switch, the sample starts to rotate, and when the value of the counter reaches the set value, the sample automatically stops rotating. Weigh the mass of the coating under the iron mill, accurate to 0.(1g. Measure 3 samples of the same coating and take the arithmetic average Value. If any of the values ​​differ from the average value by more than 10%, the test shall be repeated.
3.7 Determination of gas emission
3.7.1 Instrument
SFI type recording gas emission tester.
3.7.2 Sample preparation
JB/T5107
Paste or powder sample, dry at 150+5℃ for 1h, cool to room temperature, grind into powder with a mortar, and put in a dryer for use. 3.7.3 Determination method
Heat the gas emission tester to 1000±5℃, weigh 1.00g of sample, and evenly place it in a cold porcelain boat that has been pre-burned at 1000+5℃ for 30min. Then quickly send the porcelain boat to the red-hot part of the quartz tube, and close the tube mouth. The recorder starts to record the gas emission of the sample. Keep warm until the gas is emitted.
Measure the same sample 3 times and take the arithmetic mean. If any value differs from the mean by more than 10%, the test shall be repeated.
Density of diluted paint
Viscosity of diluted paint strips
(6mm flow cup)
Stand for 6 hours after dilution
Suspension rate of paint, %
Gas emission
Abrasion resistance of coating
Appearance of coating after coating, drying and cooling
Density of diluted paint
Conditional viscosity of diluted paint
(6mm flow cup)
Stand for 2 hours after dilution
Floating rate of paint, %
SG-SM 1
10~-15
YG-SM-1
6～12
JB/T 5107—91
Appendix A
Performance index of coating for sand casting
(Supplement)
SG-SM-2
15～20
Performance index of water-based coating
YG-SM-2
10～15
15～25
SG-M SG-MG
20-3020~3015-20
Uniform coating without impurities and cracks
Performance index of organic solvent coating
6～12
6~12 6~12
Indicator
Coating wear resistance
g, (64r)
Appearance of coating after coating, drying and cooling
Additional instructions:
YG-SM-1
YG-SM2
JB/T5107—91
Continued Table A2
Uniform coating without impurities and cracks
This standard was proposed and managed by Shenyang Foundry Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shenyang Foundry Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters were Shang Shuzhen and Luo Yuansheng.
YGM YG-me?
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