Study on the permeability of truck tire liner at operating temperature: establishing a comparable testing method

Research focus: Penetration performance of inner liner at actual operating temperatures. According to Rubber World, the work conducted by David R. Southwell and Joseph A. Incavo (consultant) has established an effective testing method that can be used to test and compare the permeability performance of real tire inner liner designs under actual operating temperature conditions. The core of this study lies in the “testing method” itself: by establishing an operable experimental path, the permeability performance between different inner lining designs can be quantitatively compared, rather than being judged empirically under a single condition.

The inner lining of a tire is a key component that maintains tire pressure and reduces gas permeation. Its performance is directly related to the ability to maintain inflation pressure and rolling resistance.

. For truck tires, prolonged and high load operating conditions keep the inner lining in a high temperature environment for a long time, making the sensitivity of permeation behavior to temperature an unavoidable variable in design evaluation. This study corresponds the testing temperature conditions to the “in service” scenario, emphasizing the acquisition of permeability data at temperatures close to real working conditions. This provides a more practical basis for the screening of inner lining materials and comparison of structural design.

The significance of the testing method: from material parameters to design comparison

The report points out that the establishment of this method enables the permeability performance of “actual tire liner design” to be tested and compared.

. This means that the evaluation object is no longer limited to isolated airtight layer adhesive samples, but is oriented towards real design configurations. For the tire and rubber industry, this comparability helps to make clearer trade-offs between formulations and structural schemes: the differences in permeability between different airtight layer rubber materials, layer thicknesses, and interlayer combinations can be presented under a unified methodological framework. From the perspective of materials and formulations, the airtightness of the inner lining layer is usually closely related to the gas barrier ability of the base rubber, the network structure formed by the filler system and vulcanization system. The selection and dosage of reinforcing fillers can affect the density and segmental mobility of the rubber material, and the dispersion state and interfacial interactions of fillers such as white carbon black can also alter the diffusion path of gases in the rubber material; The crosslinking density determined by the vulcanization system affects the intermolecular voids and permeation channels. The temperature related penetration testing method provided by this study provides a comparable detection method for the performance of the above-mentioned formula variables near the operating temperature, and also establishes an evaluation basis for the optimization of the formula of the airtight layer adhesive.

Inspiration for the polymer additive industry

Although this report focuses on the comparison of testing methods and inner liner design, and does not disclose specific formula or additive data, its methodology has direct reference value for the polymer additive industry.

. The inner lining rubber material also faces aging problems under high temperature and long-term use conditions. The selection of anti-aging agents and antioxidants will affect the performance maintenance of the rubber material in a hot oxygen environment, thereby affecting the stability of the penetration behavior. Placing penetration testing under operating temperature conditions can help evaluate airtightness while also considering the potential impact of material aging on barrier performance. In addition, the study emphasizes the testing and comparison of “real tire liner design”, suggesting that the evaluation of additives and filler schemes should be as close to actual configurations and working conditions as possible, rather than relying solely on standard samples. For formula engineers in the tire and rubber field, this means that in the adjustment of reinforcing fillers, white carbon black, and vulcanization systems, temperature related penetration tests can be used to form a more complete performance profile, considering airtightness, aging, and process feasibility in the same evaluation framework.

Conclusion

The main contribution of this study is to establish and validate a method for testing and comparing the permeability performance of tire liner layers at actual operating temperatures.

. This method provides a comparable testing tool for tire structure design and rubber formula development; The evaluation of additive schemes such as anti-aging agents, antioxidants, vulcanization systems, and reinforcing fillers also highlights the necessity of examining material properties under conditions close to real working conditions. If the penetration data can be systematically correlated with the formulation variables and aging conditions of the rubber material in the future, it will be more conducive to the directional optimization of the inner lining material.

Information source:Permeation of truck tire innerliners at in service temperatures， Organized by Herun Chemical.