This standard specifies the method for determining the impurities contained in natural raw rubber. It is not applicable to situations where the surface is contaminated by impurities. GB 8086-1987 Method for determining the impurities content of natural raw rubber GB8086-1987 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of impurities in natural raw rubber
Ray natural rubber [erminatlon ofdirt This standard refers to the international standard 1S0249-19745 Natural raw rubber - Determination of impurities? . Use the formula
UDC 678.4.032
GB8086-87
This standard specifies the determination method of the content of natural raw rubber. It is not applicable to the case where the surface is contaminated by impurities. 2 Reference standards
GBOR3-R7 Natural raw rubber sampling 3GB8084, B74 Determination of natural rubber products 33 Reagents
3.1 Solvent: kerosene (GD2.131, 206# dropwise agent (c11922). Translated by German, can also use toluene 3.2 Oil with a temperature of 60~80:
5.3 Rubber dissolving agent, industrial 2-thiophenyl boron (accelerator M), add it into the flux mentioned in 3.1 before use, and filter out impurities with a 4m gold sieve. After adding kerosene, M must be dissolved and crystals will appear after a while. Only
4.1 Bottle 25500ml
4.2 Heating device, use ten to heat the filter and its contents. Can be used as an infrared lamp or a hot plate. 4.3 With a fully corroded gold screen, the hole is 45mm, the best rust-proof screen, the screen is installed at the end of the screen with a diameter of about 25mm and a length of 1D~~30mm. The screen should be prevented from deformation and accidental damage. The single group structure of the screen is shown in the figure. The Ministry of Agriculture and Rural Affairs of the People's Republic of China 1997-07-10 approved difficult standards technical network
1988-01-01 implementation
All practical standards industry information free download
GB 8086..-87
Travel fine spinning agent
4.4 Balance: analytical balance, accuracy 0.1: 5.18. 4.5 Thermometer, measuring temperature 200℃.wwW.bzxz.Net
5 Test procedure
5.1 Preparation of sample
According to the preparation of natural raw rubber products in B8084-87, weigh about 20~40k rubber from the sample, pass it through a laboratory rubber mixer with a temperature of 0.5±1mm twice, and then take 10-208 samples. Accurately take 0.1g. For stocks with lower mass content, take 20g. For rubber with serious pollution or damage, take less sample. 2 Determination
5.2.1 Cut the sample into pieces with a width of about 5mm, put them into a clean and dry bottle, and then add 10%+-25Uml of U.>k stimulant M, and then heat the bottle in a heating curtain at a temperature of 110~160℃ until the sample is completely dissolved. The heating temperature should not exceed 160℃: overheating will cause the rubber liquid to be polarized and difficult to control, and the value should be high: during the heating process, the bottle should be stirred, which is beneficial to the dissolution of the sample. 5.2.2 Put the completely degraded sample into a sterile sieve with an accurate weight of 9.1: the sieve should first be filled with the clean agent filtered by 45m sieve. Gently pour the upper liquid into the sieve, and most of the material will remain in the sieve. Use hot agent to wash the remaining materials in the trap twice, flush it into the tank, and then rinse the impurities from the burner through the sieve, then point the flask mouth obliquely to the sieve, and spray the hot agent into the flask to rinse the flask at night. After the flushing liquid is in, use hot agent to rinse the sieve tube around the inside and outside of the selection. When the rubber liquid in the burner cannot be filtered out, add 5D--100MI kerosene in the burner, and then put the sieve that has just passed through into a small cup (50m), add kerosene drops, and it will not pass the upper edge of the trap. Place the flask and the new small cup firmly on the original test temperature sterilizer with an efficiency of 80~-40min, take out the end, filter the free liquid in the flask and beaker through the sieve again, and rinse with hot agent. Burn, beaker, and filter together. If there is still gel residue, it should be discarded for this determination and a new determination should be made. 5.2.3 Carefully remove the small sieve and put it into the steam value that has not been sieved for 15m (kerosene can be used instead of steam bubbles, and it should be placed on the heater for 15mlm). When the sieve is used, the final height must be increased by about 12mm to prevent gasoline from overflowing from the upper edge of the sieve. The control is about 15~20m. Take it out and put it into the oven at 100℃ (110℃ when using it). Remove it from the oven and cool it to room temperature. Take it out and weigh it until the difference between the two consecutive measurements is less than 5/10,000. The weight is accurate to 0.1mg.
5.2-4 The sieve should be carefully cleaned after use. The method is to soak the sieve in the medium and then put it in the oven. It is more effective to wash it in an ultrasonic cleaner for about 20 minutes, and then use tap water to stimulate it. If necessary, the sieve can be soaked in 30% hydrogen peroxide solution for 20mL. After washing, the sieve should be inspected with 18 times magnification. If it is damaged, it should not be used again. If the sieve is still seriously blocked after cleaning, the metal mesh should be replaced. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result. The result is the true value of the result.
Standard technical network w
Qualified industry information wide micro download software
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.