ABSTRACT The components of the sealant are diverse and complex, and there are differences in the relative molecular weight and solubility parameters of each component, which is a thermo-dynamic unstable system. Under long-term static storage and service conditions, the joint sealant is prone to automatic condensation and segregation, which degrades its road performance. At present, little attention is paid to the storage stability of the joint sealants. The current specifications have no clear requirements for this performance, which limits the service life of the joint sealant to a certain extent. This paper investigates the influence of sealant segregation on its macroscopic properties, microstructure and components was investigated, and reveals the reasons for the segregation behavior of the sealant. At the same time, based on the shortcomings of the existing evaluation methods for storage stability and in combination with the segregation behavior of the sealant, the viscosity difference is proposed as a supplementary evaluation index for storage stability, the viscosity difference at 180 °C with a recommended threshold of 2 Pa·s, together with a softening point difference threshold of 5 °C. The segregation test conditions are optimized to a tube diameter of 50 mm, temperature of 185 °C, and duration of 8 h.
Hydrogen circulation pumps in industrial manufacturing equipment face typical sealing challenges at the shaft end. Due to the small molecular diameter and high diffusivity of hydrogen, a single improvement approach cannot adequately enhance sealing performance. While previous studies have largely focused on material mo...
To investigate the aging behavior of silicone rubber O-rings under humid-heat stress and evaluate their storage life and reliability, a specific silicone rubber O-ring was taken as the research object. Accelerated humid-heat aging tests were carried out at 20% and 30% compression levels, respectively. Using the compres...
Bo Wang, Yuan Zhou, Jian-Wei Lai· Journal of Physics, Conferen...· 0 citations
The durability of reinforced concrete structures in tropical and humid climates is frequently compromised by the rapid ingress of moisture and aggressive ions, leading to premature corrosion and structural deterioration. This paper presents a comprehensive comparative study evaluating the effectiveness of three distinc...
S. Sajeevan, K. Baskaran· Moratuwa Engineering Researc...· 0 citations
This work focuses on key high-temperature and high-pressure digestion equipment in the chemical and pulp & paper industries. Based on thermodynamic principles, a systematic structural design and strength verification were conducted for the core pressure-bearing component—the cylinder. The design conditions include a ca...
As the core execution unit of intelligent well completion systems, the flow control valve’s sealing structure faces multiple challenges under extreme drilling conditions. This study aims to focus on a combined seal ring, comprehensively using finite element analysis and thermal elastohydrodynamic lubrication (TEHL)...
Yi Zhang, Hong-Ting Wang, Ling-Kai Yao· Industrial Lubrication and T...· 0 citations
Highlights Surface characteristics strongly affect the sealing performance of joints with metal gaskets. Reliable prediction of leakage at sealing interfaces requires coupled contact and microgap flow descriptions. Surface engineering and manufacturing-process optimization can improve sealing performance. Abstract The...
Anna Piwowar, P. Jaszak· Materials· 0 citations
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