Leather Science and Engineering ›› 2023, Vol. 33 ›› Issue (1): 15-20.doi: 10.19677/j.issn.1004-7964.2023.01.003

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Preparation and Property of Fluorine-Silicone Modified Solvent-Free Polyurethane Coating

SUN Zhe1, REN Song1, FANG Jian1, FAN Haojun2,*, GAO Qiang2   

  1. 1. College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China;
    2. College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China
  • Received:2022-05-31 Published:2023-02-01 Online:2023-01-04

Abstract: A kind of fluorine-silicone modifier (PSF) was synthesized by grafting hexafluorobutyl acrylate onto polydimethylhydrosiloxane via hydrosilylation reaction, and then used for the modification of solvent-free two-component polyurethane. The synthesis process of the modifier was optimized, and the surface morphology, hydrophobicity and abrasion resistance of the PSF modified polyurethane coatings were investigated. Results showed that the optimum reaction temperature, time and catalyst loading were 120 ℃, 12 h and 30 mg/kg, respectively. In this condition, the grafting ratio could reach 89%. Results of surface morphology and elemental analysis showed that the fluorine and silicon elements were well dispersed in the polyurethane coating. The surface roughness and water contact angle (WCA) of the coating exhibited an obvious increase with the addition of PSF. When the PSF loading was 7.5%, the coating’s WCA could reach 118.3°. Results of abrasion resistance test presented that the coating’s abrasion resistance first increased and then decreased with the increase of PSF content, and the best abrasion resistance was achieved with the PSF loading of 2.5%.

Key words: fluorine-silicone modification, solvent-free polyurethane, coating, hydrophobicity, abrasion resistance

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