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    Home > Active Ingredient News > Drugs Articles > Test method for gas permeability of rubber air bags

    Test method for gas permeability of rubber air bags

    • Last Update: 2018-02-07
    • Source: Internet
    • Author: User
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    Abstract: the amount of filling gas in the rubber air bag is an important factor to determine whether it can play the expected use effect In addition to the airtightness of the air bag, the barrier performance of the rubber used on the gas directly affects the ability of the air bag to store the gas In this paper, the air permeability of a brand of rubber water plugging air bag is tested by using vac-v2 pressure difference gas permeation instrument, and the test principle, equipment parameters, application scope, test process and other contents are introduced, which provides a reference for testing the gas permeability of rubber air bag Key words: gas permeability, gas permeability, barrier performance, rubber air bag, differential pressure gas permeameter, air permeability 1, significance Rubber air bag is an inflatable product, which has the characteristics of soft shape, deformable, foldable, easy to remove after use, convenient for use, etc the common rubber air bag can be used in water blocking construction, leakage detection, ship silencing, shock absorption, construction and other fields, through filling compressed gas to make the expansion of the air bag reach the section design requirements Taking rubber water plugging air bag as an example, this kind of air bag is mainly used for water plugging operation of water pipeline The air bag is filled with air of certain pressure to make the air bag fill the whole pipeline The friction between the air bag wall and the pipeline is used to block the water flow In order to make the air bag effectively contact with the pipeline wall, a certain amount of air is required to be kept in the air bag all the time, that is, it has good sealing performance and high resistance Septum In particular, the rubber air bag with a long use time should have a higher barrier to the filling gas, so as to prevent the use effect from being affected by the large amount of gas in the air bag penetrating outward during use Therefore, it is necessary to strengthen the test of rubber air bag for filling gas barrier performance Fig 1 various types of rubber air bags 2 The test sample is the rubber water plugging air bag produced by an enterprise 3 The test is based on the principle of differential pressure method to test the air permeability of the sample Refer to GB / T 7755-2003 "determination of air permeability of vulcanized rubber or thermoplastic rubber" for the test process 4 In this paper, vac-v2 differential pressure gas permeation instrument is used to test the air barrier performance of the sample The equipment is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd Fig 2 test principle of vac-v2 differential pressure gas permeameter 4.1 The clamped sample separates the upper and lower test chambers of the equipment The upper chamber is filled with a certain pressure of test gas, and the lower chamber is a vacuum, so a certain pressure difference is formed on both sides of the sample Under the effect of the pressure difference of the test gas, the upper chamber penetrates the sample into the lower chamber, and the gas permeability of the sample can be obtained by measuring the change of the pressure of the lower chamber 4.2 test range of equipment parameters and equipment is 0.05 ~ 50000 cm 3 / (m 2.24h · 0.1MPa), vacuum resolution can reach 0.1pA; temperature control range is 5 ℃ ~ 95 ℃, temperature control accuracy is ± 0.1 ℃; humidity control range is 0% RH, 2% RH ~ 98.5% RH, 100% RH, humidity control accuracy is ± 1% RH It can meet the detection requirements under different test conditions; it has three completely independent test chambers, which can test three identical or different samples at the same time; it can carry out data fitting under any temperature, so as to easily obtain the test results under extreme test conditions; after reform, the equipment can also support the test of toxic (separator) gas, flammable and explosive gas; it can provide standard membrane for fast test Fast calibration to ensure the accuracy and universality of test data; support Lystem TM laboratory data sharing system to manage test results and test reports in a unified way 4.3 scope of application (1) this equipment is mainly used for testing gas transmittance, permeability coefficient, solubility coefficient and diffusion coefficient of various sheet and film samples at various temperatures Sheet materials include various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet Film type includes all kinds of plastic film, paper plastic composite film, CO extrusion film, aluminum coating film, aluminum foil, aluminum foil composite film and other film-like materials (2) The equipment can also be extended to the air permeability test of aerospace materials, paper and cardboard, paint film, fiberglass cloth, fiberglass paper, cosmetic hose sheet, various rubber sheets and other materials (3) This equipment is suitable for the transmittance test of various gases, such as nitrogen, oxygen, carbon dioxide, helium, air, etc (4) This equipment meets many national and international standards, such as GB / T 7755-2003, ISO 15105-1, ISO 2556, GB / T 1038, ASTM d1434, JIS k7126-1, ybb00082003, etc 5 During the test (1) three samples with diameter of 97 mm were cut from the surface of the rubber airbag sample to be tested by a special sampler (2) Mount the sample, apply a layer of vacuum grease around the test area of each test chamber, place the filter paper with a diameter of 65 mm in the test area, then cover the sample, remove the air bubble between the sample and the test chamber contacted, and clamp it with a clamping device Figure 3 Sample clamping figure (3) parameter settings: sample name, test temperature, test humidity, sample thickness and other parameter information (4) Click the test option in the test, the test starts, the equipment automatically records the change of the lower chamber pressure, and displays the test results according to the test results after the test 6 Results the average air permeability of the three samples was 35.7462 cm 3 / (m 2.24h.0.1mpa) 7 Conclusion the barrier performance of rubber air bag is an important factor to determine whether the filling gas can be stored for a long time, which has an important impact on the performance of the air bag In this paper, the air permeability of a rubber water plugging air bag sample is tested The whole test process is simple Three samples are tested at a time, with high test efficiency, good repeatability and stability of test results, high test accuracy, which can truly reflect the air barrier performance of the tested sample According to the different filling gas in the air bag of different purposes, replace the test gas, and then use this method to test the barrier performance of the corresponding gas Jinan Languang mechanical and Electrical Technology Co., Ltd is a high-tech enterprise specializing in the research and development, production and packaging testing services of packaging testing equipment The existing testing equipment includes oxygen transmittance testing equipment, water vapor transmittance testing equipment, electronic tensile testing machine, roof air analyzer, friction coefficient meter, sealing tester and other types of testing equipment The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry!
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