Keywords: Coating; Damping; Noise Reduction; Shock Resistance 1.Cost-saving Requirements for Damping Coatings Facilities such as the inner walls of subways, high-speed rail tunnels, and instrument housings are exposed to long-term high-frequency vibration. Conventional coatings like acrylic and modified epoxy coatings often suffer from issues including paint film cracking and insufficient noise reduction. Therefore, there is an urgent need to enhance damping performance to ensure operational stability. Such applications impose strict requirements on the coating’s vibration absorption, weather resistance, and application compatibility. Traditional solutions mostly rely on imported damping materials, which are costly and vulnerable to supply chain disruptions. 2.Technical Solution This pain point can be effectively resolved through formula optimization. The core solution is to add 5% slow recovery TPE, 2% hydrophobic dispersant, and a small amount of antioxidant into the coating system to form a high performance damping coating. Slow recovery TPE combines rubber elasticity and plastic processability. It can efficiently absorb vibration energy through internal friction of molecular chains, significantly improve the coating’s damping factor, reduce noise transmission, and prevent paint film cracking. The 5% addition level has been optimized through multiple tests. Without affecting the coating’s leveling and adhesion, it can increase vibration absorption efficiency by more than 40%, meeting the anti vibration requirements for tunnels, instruments, and other applications. The addition of 2% hydrophobic dispersant breaks up the agglomeration of slow recovery TPE particles. By forming a stable adsorption layer, it prevents flocculation and sedimentation, ensuring uniform dispersion of TPE in the coating system. It also improves the water resistance of the paint film and avoids defects such as water marks and peeling in humid environments. A small amount of antioxidant delays the aging of TPE molecular chains, extends the service life of the coating, and adapts to the long term requirements of complex working conditions such as tunnels. The core advantage of this solution lies in cost control. This damping TPE can replace imported materials in performance. With domestic raw materials and production, the cost is greatly reduced. In addition, after formula optimization, no additional adjustment of construction process or special equipment is required. The overall cost is directly reduced by 50% compared with traditional solutions using imported materials. 3.Characteristics of This Slow-Recovery TPE The damping performance of this TPE is derived from its base material SIS. The corresponding SIS features low hardness, excellent pressure sensitivity, and high cohesion. Under stress, the soft segments exhibit viscous flow, which dissipates energy while reducing compression and rebound speed, making it ideal for shock absorption, noise reduction, and impact resistance. However, its dispersibility is poor. It must be processed via plasticization and granulation into damping TPE particles before it can be directly used in coating and elastomer formulations. For outdoor applications, the dosage of antioxidant should be appropriately increased. Tests show that after addition, the coating’s anti-sagging performance during application is also improved. It maintains stable damping performance in environments ranging from -40°C to 50°C, and its resistance to thermal cycling and impact both meet the industry Grade A standard. Its eco-friendly, VOC-free properties also satisfy the green construction requirements of the rail transit sector.