This standard specifies the quantitative method for determining the solvent extracts in rubber. This standard applies to the following vulcanized rubbers and their blends: natural rubber, styrene-butadiene rubber, butadiene rubber, oil-extended styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber. This standard also applies to the above-mentioned raw rubbers and mixed rubbers except ethylene-propylene rubber. GB/T 3516-1994 Determination of solvent extracts in rubber GB/T3516-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Rubber-Determination
of solvent extract
This standard refers to ISO/DIS1407:1988 "Rubber-Determination of solvent extract". Subject content and scope of application
This standard specifies the quantitative method for determining solvent extract in rubber. GB/T 3516-94wwW.bzxz.Net
Replaces GB3516-83
This standard applies to the following vulcanized rubbers and their blends: natural rubber, styrene-butadiene rubber, cis-butadiene rubber, oil-extended styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber. This standard also applies to the above-mentioned raw rubbers and mixed rubbers except ethylene-propylene rubber. 2 Reference standards
GB/T15340 Sampling and preparation of natural and synthetic raw rubber 3 Summary of methods
Extract the sample with a suitable solvent and weigh the extract or the sample after extraction. 4 Reagents and materials
Acetone (GB/T686);
Chloroform (GB/T682);
4.3 Methanol (GB/T683);
Isopropyl alcohol (HG/T 3-1167);
Butanone;
4.6 Toluene (GB/T 684);
4.7 Anhydrous ethanol (GB/T678);
4.8 Acetone-chloroform mixed solvent: 32 parts of acetone and 68 parts of chloroform (volume ratio) are mixed. Be particularly careful when handling mixed solvents to prevent them from reacting with alkali to form explosive mixtures. 4.9 Anhydrous ethanol-toluene mixed solvent: 70 parts of anhydrous ethanol and 30 parts of toluene (volume ratio) are mixed. 4.10 Solvents used for various rubbers: See the table below. Approved by the State Bureau of Technical Supervision on December 22, 1994, 526
Reduced to the following conditions
Implemented on September 1, 1995
Rubber varieties
Natural rubber
Butadiene rubber
Styrene-butadiene rubber, oil-extended styrene-butadiene rubber
EPR and combinations of the above rubbers
Chloroprene rubber
Butadiene rubber
Butyl rubber
GB/T 3516-94
Solvents for vulcanized rubber
Acetone or acetone-chloroform mixed solvent
Acetone or acetone-chloroform mixed solvent
Acetone or acetone-chloroform mixed solvent
Isopropyl alcohol
Note: ① Mixed solvents must be used for vulcanized rubber samples containing asphalt. ② Except for the raw rubber condensed with potassium aluminum sulfate.
5 Instruments
5.1 Soxhlet extractor (see Figure 1): The volume of the receiving bottle is 60-80mL. Figure 1 Soxhlet extractor
5.2 Rapid extractor (see Figures 2 and 3). 6 Analysis steps
Solvents for raw rubber and compound rubber
Ethanol-toluene mixed solvent
Ethanol-toluene mixed solvent
Isopropanol
Isopropanol
6.1 Analysis steps using Soxhlet extractor
Weigh about 2g of a strip sample cut into a cross-sectional area of ​​about 1mm2, accurate to 0.001g. Wrap the weighed sample with filter paper extracted with the corresponding solvent and place it in the Soxhlet extractor. Add about 1.5 times the volume of the siphon cup into the receiving bottle of constant weight, and reflux extract on a heating bath for 16±0.5h. After the extraction is completed, the receiving bottle is steamed on a heating bath until it is nearly dry, and then weighed after drying in a thermostat at 70 ± 5 ° C for 2 hours. 6.2 Analysis steps using a rapid extractor
Weigh about 2g of a strip sample cut into a cross-sectional area of ​​about 1mm, accurate to 0.001g. Wrap it with filter paper and put it in the siphon cup of the rapid extractor. Inject 100mL of solvent and place it in a heating bath for reflux extraction for 6 ± 0.5h. After the extraction is completed, air dry the sample and place it in a thermostat to dry for 1h, then take it out and place it in a desiccator. Weigh it after cooling to room temperature. Note: ① Prepare the sample according to the method specified in GB/T15340 for raw rubber. ② Choose different drying temperatures for different extraction solvents: acetone, acetone-trifluoromethane mixed solvent, methanol: 70℃, isopropanol, butanone: 85℃; anhydrous ethanol-toluene mixed solvent: 120℃. 627
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7 Calculation of analysis results
Rapid extractor
7.1 Extract using Soxhlet extractor
GB/T 3516--94
2 Small hole
Figure 3 Rapid extractor
The solvent extract is expressed as mass percentage and calculated according to formula (1): m-m2
Solvent extract (%)=
× 100
Where: m—i
Mass of sample, g;
Total mass of receiving bottle and extract, g,
m -mass of receiving bottle, g.
7.2 Extraction using a rapid extractor
Solvent extract is expressed as a percentage by mass and is calculated according to formula (2): Solvent extract (%) =
Wherein, m -
The mass of the sample, g;
The mass of the sample after extraction and drying, g. 8 Parallel determination tolerance
Extract
≥10%
9 The experimental report
should include the following:
Tolerance
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This national standard GB/T3516-94;
The extraction method used;
The measurement results;
Abnormal phenomena that occurred during the measurement.
Additional Notes:
GB/T3516
6—94
This standard was proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry. This standard was drafted by the Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry. The main drafter of this standard is Zhang Xiuting.
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