Hot-melt polyurethane sealant breaks through the problem of stress cracking and empowers automobile manufacturing
Hot-melt polyurethane sealant breaks through the problem of stress cracking and empowers automobile manufacturing
Keywords: hot-melt polyurethane sealant, automotive NVH control, substrate deformation adaptability
The latest patent of Fujian Changde Adhesive Industry (CN 119019973 A) significantly improves the deformation resistance of sealants by optimizing the resin and polyol formula. It uses high molecular weight liquid polyester polyol (molecular weight ≥ 3500, Tg ≤ -10℃) and thermoplastic acrylic resin (such as Mitsubishi BR-116) to solve the cracking and leakage problems caused by stress concentration when the substrate is deformed in traditional polyurethane hot melt adhesives. This technology is particularly suitable for automobile window assembly and sheet metal bonding. It maintains elasticity in an environment of -40℃~80℃, effectively improves the vehicle NVH (noise, vibration and acoustic roughness) performance, and adapts to the high-standard production line requirements of brands such as Audi and Toyota.
Industry value: Reduce the rework rate by 30% and extend the sealing life of the car body.