Detection of gas permeability resistance of inner tube with vac-v2 differential pressure gas permeation meter

Tire is the main undertaker of vehicle load, and the air tightness of tire has more or less influence on the overall performance of vehicle: the tire with good air tightness can improve the safety, driving performance and comfort of vehicle driving; can reduce the rolling resistance of tire, thus reduce the consumption of fuel; because of the reduction of fuel consumption, then reduce the emission of carbon dioxide; can reduce the wheel The number of tire inflation is convenient for vehicle maintenance Only when the tire maintains the proper air pressure in the tire can it have the proper shape of Zui, and all kinds of performance can be brought into full play according to the design performance requirements Therefore, the air permeability of the air tight layer is very important for the automobile Test basis: for the test of the air tightness of the tire's air tight layer, it can be carried out according to GB / T 7755-2003 "determination of the air permeability of vulcanized rubber or thermoplastic rubber" This standard gives a method for testing the air tightness of rubber materials, which can quickly and accurately test the air permeability of rubber, and then provides a reliable basis for the selection of materials in tire manufacturing Test principle: using the principle of differential pressure test, place the pre-treatment sample between the upper and lower test chambers First, vacuum the low-pressure chamber, and then vacuum the whole system; when the specified vacuum degree is reached, close the lower chamber of the test, fill the high-pressure chamber with a certain pressure of test gas, and ensure that a constant pressure difference is formed on both sides of the sample; because of the existence of the pressure gradient, the gas penetrates from the high-pressure side to the low-pressure side, through the monitoring and treatment of the pressure in the low-pressure side, it can be The barrier parameters of the tested samples are obtained Sample selection: the degree of gas diffusion and permeation in polymer is related to the molecular thermal movement of polymer The side methyl in butyl rubber molecular chain displays intensively, which limits the thermal movement of polymer molecular Therefore, butyl rubber has good air permeability resistance and is commonly used in inner tube or air tight layer of tire This paper introduces the test method of air tightness of inner tube of tire with butyl rubber as an example The sample shall be flat, free from scratch, perforation or other defects Instrument and equipment: Based on the principle of differential pressure test, the vac-v2 differential pressure gas permeameter independently developed by Jinan Languang Electromechanical Technology Co., Ltd is a professional instrument for gas permeability test The three test chambers of the instrument are completely independent and can test three identical or different samples at the same time The test precision is high, and the test temperature can be controlled within 5 ℃ ~ 95 ℃, and the precision is up to ±0.1 ℃ 。 Humidity control range is 0% RH, 2% RH ~ 98.5% RH, 100% RH, humidity control accuracy is ± 1% RH, which can accurately test the gas permeability of high barrier materials Fig 1 test conditions of vac-v2 pressure difference gas permeameter: temperature 23 ℃, dry air Test procedure: cut three samples with special sampler Fig 2 clean the dust on the surface of the lower chamber with soft material, evenly apply a layer of vacuum grease on the sealing area of the lower chamber, place the cut filter paper on the low-pressure side to support the specimen, and prevent the vacuum grease from entering the low-pressure chamber, and place the specimen Fig 3 place the sample cover and close the chamber, set the test parameters and start the test After testing, the air permeability of the sample is as follows: the test result of sample name thickness (μ m) is cm3 / (M2 · 24h · 0.1MPa) 1 × 210017.1892 × 210015.903 × 210016.267 conclusion: the gas permeability of automobile inner tube rubber can be measured by using vac-v2 differential pressure gas permeability meter, which better reflects the air tightness of automobile inner tube Jinan Languang mechanical and Electrical Technology Co., Ltd has provided numerous rubber permeability testing services for customers around the world in recent years, including various types of automobile inner tubes and rubber products of many companies at home and abroad Labthink Languang expects to enhance technical exchanges and cooperation with enterprises and institutions in the industry For more information about related instruments, you can visit Jinan Languang company For more information, call Copyright notice: the copyright of this article is Jinan Languang Electromechanical Technology Co., Ltd It is forbidden to reprint without permission!