This method uses sulfuric acid digestion to determine the resin content of carbon fiber reinforced plastics. The principle is to use heated sulfuric acid to completely decompose the resin matrix. It is suitable for carbon fiber reinforced plastics that can completely decompose the resin matrix under certain conditions without excessively corroding the fibers. GB/T 3855-1983 Test method for resin content of carbon fiber reinforced plastics GB/T3855-1983 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T3855-1983
Test method for resin content of carbon fiber reinforced plastics 1984—06—01
National Bureau of Standards
Page 1
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"Test method for resin content of carbon fiber reinforced plastics" Material No.:
3855-1983
(Supplement).
Appendix A Conversion of Fiber Volume Content of Carbon Fiber Reinforced Plastics 2 Test Instruments and Reagents,
1 Sample
3 Test Steps
5 Test Results
4 Calculation
6 Test Report
Additional Notes:
《Test Method for Resin Content of Carbon Fiber Reinforced Plastics》Material No. 8855-1983
Page 2
This method uses sulfuric acid digestion to determine the resin content of carbon fiber reinforced plastics. The principle is that heated sulfuric acid completely decomposes the resin matrix. It is suitable for carbon fiber reinforced plastics that sulfuric acid can completely decompose the resin matrix under certain conditions without excessively corroding the fibers.
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Fiber reinforced car
Content test
55-1983
Page 3
1 Sample
The sample weight is about 0.5g, and the sample thickness is less than 3mm. 1.3.2 Sample weight and sample thickness are in accordance with 1.1. When the sample thickness is greater than 3mm, it should be split to make it less than 3mm, and then 1.1 Sample weight and thickness
1.3.1 The sample should be selected from a representative part of the entire sample or according to technical requirements, 1.2 Number of samples
At least 3 samples per group.
Digestion. The shape of the sample is not limited, as long as it fits into the container. 1.3 Sample preparation
According to the relevant provisions of GB1446 "General Principles for Test Methods for Performance of Fiber Reinforced Plastics", 1.3.3 Remove oil stains from the surface of the sample.
1.4 Sample state adjustmentwww.bzxz.net
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Test method for fat content
3855-1983
Page 4
Test instruments and reagents
2.1 Instruments
2.1.1 Analytical balance: sensitivity 0.1mg.
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2.1.3 Beaker or flask: volume 25ml.
2.1.2 Temperature-adjustable heater.
2.1.4 Acid-resistant filter: pore size 4.5~9.0um. 2.1.5 Suction filter bottle.
2.1.6 Vacuum pump and pressure gauge
2.1.7 Oven.
2.2 Reagents
Weighting vehicle
2.2.195~98% sulfuric acid: analytical grade
2.2.230% hydrogen peroxide: analytical grade.
Content
Page 5
3.1 Weigh about 0.5g of sample, accurate to 0.1mg. 3 Test steps
3.2 Place the sample in a beaker or flask and inject 95~98% sulfuric acid (the amount of sulfuric acid shall not be less than 30ml). Insert a contact thermometer and adjust to the required temperature.
3.3 Heat the container containing the acid and sample in a fume hood. The time for the digestion solution to rise from room temperature to the digestion temperature (Note) shall not be less than 15min.
Note: "Digestion temperature" is defined as the temperature before the addition of hydrogen peroxide. 3.3.1 The digestion temperature of epoxy and polyester carbon fiber reinforced plastics is 220±10℃, not constant temperature. 3.3.2 The digestion temperature of phenolic carbon fiber reinforced plastic is 285 ± 5℃, and the temperature is kept constant for 1h. 3.3.3 The selection basis of digestion temperature of different types of resin is: under the selected temperature conditions, adding 30% hydrogen peroxide according to 3.4 can make the digestion liquid clear and the fibers can all float to the liquid surface. 3.4 The mixed solution after digestion is clarified with 30% hydrogen peroxide. 3.4.1 Slowly drip hydrogen peroxide along the wall of the bottle until the digestion liquid is clear and the fibers float to the surface of the solution. 3.4.2 Heat the clarified mixed solution to the digestion temperature for 10min. If it is turbid again, add more drops and stir until it is clear. 3.5 Weigh the cleaned and constant weight filter to an accuracy of 0.1mg. 3.6 Dilute the clarified and cooled digestion liquid with distilled water and vacuum filter. The filtration pressure is preferably 130mmHg. And filter repeatedly with distilled water until the solution is neutral. Finally, rinse once with acetone (about 30ml). 3.7 After filtration, place the fiber and filter in an oven at 150±5℃ and dry for 2 hours. Then place them in a desiccator and cool to room temperature. Weigh them to an accuracy of 0.1mg. Subtract the weight of the filter in 3.5 from this weight to get the weight of the digested carbon fiber. 3.8 Weigh a bundle of fibers that are representative of the sample and perform a blank test under the same conditions as above. The fiber weight is approximately equal to the weight of the digested sample, and the length should be similar to the fiber length in the sample. Then calculate the percentage of weight loss of the blank fiber. Page 6
Fiber reinforcement!
Test method for plastic resin content
3855-1983
4 Calculation
4.1 The resin content of carbon fiber reinforced plastic is calculated by the following formula: G2
Wr=（1-
-）X100
GI(1-W1)
Wr-weight percentage of carbon fiber reinforced plastic resin; G1-weight of carbon fiber reinforced plastic sample before digestion, g; G2-weight of remaining carbon fiber after digestion, g; W1-fiber weight loss percentage of blank test. 4.1.1 The carbon fiber reinforced plastic resin content calculated by this formula does not include substances such as fiber coating and sizing agent. If you want to obtain the resin content including the sizing agent, you need to extract the fiber for the blank test and then digest it. 4.1.2 If you want to obtain the fiber volume content of carbon fiber reinforced plastic, you can calculate it according to Appendix A. Page 7
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Test Method for Resin Content
3855-1983
Test Results
The test results are in accordance with the relevant provisions of GB1446
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"Test Method for Carbon Fiber Reinforcement Content"
Material Tree)
3855-1983
Page 8
Test Report
The test report includes the following contents:
a. Name of test item:
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b. Source and batch number of samples;
c. Number of samples:
d. Abnormal phenomena in the test;||t e. Test results; f. Test personnel, date and other information. Test Methods for Carbon Fiber Reinforced Plastics (CCRP) 3855-1983 Page 9 Appendix A Conversion of fiber volume content in carbon fiber reinforced plastics The fiber volume content in carbon fiber reinforced plastics is converted according to the following formula: G2 pf(1-w1) Wf·pc or Vf= Wherein: Vf - volume percentage of carbon fiber reinforced plastic fiber; pf - carbon fiber density, g/cm[3]; density of carbon fiber reinforced plastic specimen, g/cm[3]; - fiber weight percentage in carbon fiber reinforced plastics: G1, G2 and W1 have the same meanings as in 4.1 of the main text.
(Supplement)
·(A1)
·(A2)
Page 10
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《Test Method for Resin Content of Carbon Fiber Reinforced Plastics》
3855-198
Additional Notes:
This standard was proposed by the State Administration of Building Materials Industry and is under the jurisdiction of the Fiber Reinforced Plastics Standardization Technical Committee of the National Plastics Standardization Technical Committee.
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This standard was drafted by the Harbin Glass Fiber Reinforced Plastics Research Institute of the State Administration of Building Materials Industry. The main drafters of this standard are Wang Rongqiu and Zhang Yanling. 《Test Method for Resin Content of Carbon Fiber Reinforced Plastics》
3855-198
Additional Notes:
This standard was proposed by the State Administration of Building Materials Industry and is under the jurisdiction of the Fiber Reinforced Plastics Standardization Technical Committee of the National Plastics Standardization Technical Committee.
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This standard was drafted by the Harbin Glass Fiber Reinforced Plastics Research Institute of the State Administration of Building Materials Industry. The main drafters of this standard are Wang Rongqiu and Zhang Yanling.
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