A multi-crosslinked bio-based waterborne polyurethane for sustainable waterproof and antifouling coatings

Release time:2026-03-24  Hits:

• Affiliation of Author(s):长春工业大学
• Journal:Progress in Organic Coatings
• Abstract:Conventional waterborne polyurethane (WPU) coatings often exhibit limited anti-fouling performance due to the presence of intrinsic hydrophilic groups. Meanwhile, the sustainable development concept has urgently demanded the development of environmentally friendly high-performance coatings. This study proposes a strategy for preparing a waterborne polyurethane with a multiple crosslinking structure by using bio-based raw materials to replace part of the petroleum-based polyols. Firstly, the chain extension modiffcation was carried out by introducing hexamethylene diisocyanate trimer (HDIT) and a hydrophobic mono-terminal dihydroxy polydimethylsiloxane (PDMS) prepolymer. Then, the polyurethane main structure was constructed with renewable castor oil (CO) and polytetramethylene glycol (PTMG) as the soft segments and isophorone diisocyanate (IPDI) as the hard segment. Finally, (3-isocyanatopropyl)triethoxysilane (IPTES) was used as a crosslinking agent to successfully synthesize SiX-WPU with a dense crosslinked structure. System performance analysis indicates that the amount of PDMS introduced plays a crucial role in the comprehensive performance of the coating. At a PDMS addition ratio of 3 wt%, the material exhibited optimal performance, with a water contact angle of 107.0◦ indicating signiffcant hydrophobicity and a water absorption rate reduced to 5.23% demonstrating good water penetration resistance. Furthermore, effective droplet repellency against contaminating liquids was imparted to the coating by the surface enrichment of low surface energy silicon components. Additionally, at a wavelength of 500 nm, when the PDMS content is 3 wt%, the optical transmittance reaches 86.09%, maintaining good optical transparency. This method proposes a new material design concept for preparing bio-based waterborne polyurethane coatings with water repellency and anti-fouling properties, and it is hoped that it can provide a reference for the development of related environmentally friendly coating materials.
• Indexed by:Journal paper
• Discipline:Natural Science
• Document Type:J
• Translation or Not:no
• Date of Publication:2026-02-18
• Included Journals:SCI

• 1.黄敏 POC 2026.pdf