Nitrogen is a chemically stable inert gas, which can effectively prevent the elasticity, strength reduction and cracking and other aging phenomena caused by the oxidation of the tire lining layer and rubber, and can also avoid the corrosion of metal components, greatly reduce the rust of the rim and prolong the service life of the tire. Tire pressure is an important factor affecting the driving stability of the car and the size of the fuel consumption, the tire pressure is too large and the car runs unsmoothly and is prone to burst, the lack of tire pressure will increase fuel consumption, the maintenance of stable tire pressure is not only related to the initial filling nitrogen volume of the tire, but also related to the storage ability of the tire to nitrogen in the process of use, wherein the nitrogen barrier performance is an important factor in evaluating the nitrogen retention ability of the tire, and the higher nitrogen barrier performance can reduce the penetration of nitrogen in the tire into the environment, so that the nitrogen volume in the tire is maintained at the initial level for a long time。
Introduction to the rubber nitrogen permeability detection scheme of rubber tires
The test was carried out by SYSTESTER GTR-736 differential pressure method gas permeability, and the nitrogen permeability was tested by the principle of differential pressure method, and the test was based on the constant volume method in GB T 7755-2003 "Determination of air permeability of vulcanized rubber or thermoplastic rubber". It is professionally used to test the gas permeability, permeability coefficient, solubility coefficient and diffusion coefficient of a variety of film and sheet specimens at various temperatures. Films include various plastic films, paper-plastic composite films, co-extrusion films, aluminized films, aluminum foils, aluminum foil composite films and other film-like materialsSheet materials include various engineering plastics, rubber, building materials and other sheet materials, such as PP sheets, PVC sheets, PVDC sheets. It can also support the testing of toxic gases, flammable and explosive gases.
GTR-736 Differential Pressure Gas Permeameter Test Principle
The principle of differential pressure method refers to the process of gas permeation by maintaining a certain pressure difference between the two sides of the sample. The test chamber of the device is divided into the upper The lower two chambers, the upper chamber is a high-pressure chamber, filled with a certain pressure of test gas, the lower chamber is a low-pressure chamber, a low-pressure environment is formed by vacuuming, the gas in the upper chamber penetrates into the lower chamber through the sample under the action of pressure difference, the volume of the lower chamber is constant, the permeable gas will cause the change of pressure in the chamber, when the osmotic equilibrium is reached, the change of pressure in the lower chamber with time is a linear relationship, and the gas permeability and related parameters of the sample can be obtained by monitoring the change of pressure in the lower chamber.
GTR-736 differential pressure method gas permeability test process
Three samples with a diameter of 97 mm were cut from the surface of the tire rubber sample to be tested.
A layer of vacuum grease was evenly applied around the perimeter of the 3 test chambers, and a 65 mm diameter filter paper was placed in each of the permeation areas. The specimen is placed on the test chamber and air bubbles are removed from the specimen and the test chamber. Close the upper chamber and clamp it with a fixed structure.
Set the test temperature, test humidity, specimen name, test mode and other parameter information on the control software, open the vacuum pump, water bath temperature control device, nitrogen gas source, click the test option, and the test starts. The equipment automatically conducts the test according to the program and set parameters, and reports the test results after the test.
The tire's ability to block nitrogen from the internal filling is an important factor affecting the stability of the tire. The SYSTESTER GTR-736 differential pressure gas permeation meter is simple to operate, with a high degree of intelligence, stable test data and high accuracy. For more information, please log in to Jinan Sike Testing Technology***Official** or contact us!