Work

Eco-friendly solvent-free waterborne hydroxyacrylate dispersions based on bio-based castor oil hyperbranched polyols for two-component polyurethane coatings with damping performance

Year: 2026

Type: article

Abstract: An eco-friendly, solvent-free waterborne hydroxyacrylate dispersion was developed using a castor-oil hyperbranched polyester polyol (COHPE) as a reactive diluent, enabling the preparation of two-component waterborne polyurethane (2 K WPU) coatings with intrinsic damping functionality. The COHPE was synthesized via esterification and incorporated into the waterborne hydroxyacrylate system to simultaneously reduce viscosity and enhance processability without the use of volatile organic solvents (VOC). The resulting dispersion (COHPE-WA-30) exhibited excellent colloidal stability and uniform particle sizes, while the cured films demonstrated a break strength of 6.81 MPa, elongation at break of 22.26%, and a static water contact angle of 86.2° ± 0.19°. Dynamic mechanical analysis (DMA) revealed the tan δ value remains greater than 0.3 within the temperature range of 43–101 °C, confirming superior damping performance. Moreover, the solvent-low 2 K WPU coatings achieved excellent adhesion (5B), gloss, and solvent resistance, combined with enhanced thermal stability. This study establishes an environmentally benign and scalable approach for fabricating high-performance 2 K WPU coatings that integrate renewable materials, solvent-low processing, and multifunctional mechanical-damping behavior.

Source: Progress in Organic Coatings

DOI: 10.1016/j.porgcoat.2026.109961

Authors: Yuan Duan, Lingjia Qiu, Mengting Zhang, Yongbo Ding, Peilin Wang, Liang Shen

Institution: Jiangxi Science and Technology Normal University

Language: English

Topic: Dendrimers and Hyperbranched Polymers

Subfield: Polymers and Plastics

Field: Materials Science

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $4,350