Synthesis and properties of silicone-modified polyurethane acrylate for magnetically driven blue light photocurable superhydrophobic coatings

Abstract

A low surface energy silicone-modified polyurethane acrylate (Si-PUA) has been synthesized and employed as the primary constituent for the magnetically driven photocurable coatings. By integrating magnetically driven assembly technology with blue light photocuring technology, a superhydrophobic coating featuring low surface energy and micro/nano rough structures was successfully fabricated. The influences of hydroxy-terminated polydimethylsiloxane (PDMS) content and the R-value (-NCO/-OH) on the performance of PUA and coating systems were investigated using Photo-DSC, TGA, rheology, tensile testing machine, and SEM-EDS. The molecular structure of Si-PUA was characterized using FT-IR and ¹HNMR. The result revealed that the composite coating exhibited a minimum surface energy when the PDMS content was 5 wt% and the R-value was 1.6, resulting in a surface free energy of 24 mJ/m². When the coating formulation consists of a Si-PUA:HEA ratio of 7:3, an initiator dosage of 2% (with CQ/EDB at a 1:1 ratio), and a carbonyl iron powder (CIP) content of 100 wt%, the resulting photocured film exhibits a surface contact angle of 157.6° and a rolling angle of 5°, thereby satisfying the superhydrophobicity standard.

Graphical Abstract

Keywords:

• Polyurethane acrylate
• low surface energy
• magnetically driven
• blue light photocuring
• superhydrophobic

Author contributions

Jiahao Zhangyang: Conceptualization, Investigation and Writing-Original Draft; Duchao Feng: Methodology, Investigation and Formal analysis; Ruihan Ma: Data Curation; Mihan Zhang: Visualization; Chenglong Wang: Validation and Writing-Review and Editing; Jinhuan Zheng: Funding acquisition and Supervision.

Disclosure statement

The authors declare no conflict of interest.

Data availability

The data that support the findings of this study are available from the corresponding author on request.

Additional information

Funding

The work was supported by the Basic Public Welfare Research Program of Zhejiang Province (LGF21E030004) and the Fundamental Research Funds of Zhejiang Sci-Tech University (23202119-Y).