Synthesis and Characterization of Multifunctional Two-Component Waterborne Polyurethane Coatings: Fluorescence, Thermostability and Flame Retardancy

Abstract

Fluorescent and flame-retardant two-component waterborne polyurethane coatings were synthesized using 1,5-dihydroxy naphthalene, a halogen-free polyphosphate and a hydrophilic curing agent, and their properties were systematically characterized. The average particle sizes and zeta potential values were below 170 nm and −30 mV. Meanwhile, the multifunctional two-component waterborne polyurethane coatings had strong fluorescence intensities. When comparing with the coatings with 0.5 wt % 1,5-dihydroxy naphthalene, the coatings with 1.0 wt % 1,5-dihydroxy naphthalene had a stronger microphase separation. Interestingly, the thermostability of the multifunctional coatings was remarkably improved through 1.0 wt % 1,5-dihydroxy naphthalene, and besides it belonged to nonflammable materials. Additionally, all of the coating films passed the solvent resistance testing. These samples with different amounts of 1,5-dihydroxy naphthalene are environmental friendly, especially applications that require transparent and fluorescent coatings.

Preparation of Polydimethylsiloxane-Modified Waterborne Polyurethane Coatings for Marine Applications

“…During the formation of colloidal particles in the water-based dispersions, the hydrophilic groups and segments tend to be on the outer layers, while the hydrophobic PDMS favored the inner layers. As a result, a higher content of PDMS results in a larger free volume and lower chain packing density in the interior of the colloidal particles, and thus, larger particles [1,[32][33][34]. Furthermore, all the PS-WPU dispersions showed good stability with no precipitation at room temperature for a period of three months.…”

“…Polyurethane (PU), a polymer joined by urethane bonds, is produced by the reaction of polyols with isocyanates. Currently, PUs are one of the most commonly used materials in various applications such as coatings [1,2], adhesives [3,4], foams [5,6], and elastomers [7,8]. The properties of PU are dependent on the type of polyols and isocyanates used, and the soft segment of PU is formed from a polyol, while the hard segment is composed of an isocyanate and a chain extender.…”

Role of Macrodiols in the Synthesis and Thermo-Mechanical Behavior of Anti-Tack Water Borne Polyurethane Dispersions

“…The eco-friendly nature and versatile capacity of PUD has made it a multipurpose product of industry [ 18 , 19 ]. The hydrophobicity of PU can be dealt easily by emulsification and by adopting some structural alterations [ 20 , 21 , 22 ]. The structural modifications can be performed by the macrodiols or diisocyanates.…”

The optical shielding performances and mechanisms of green flame-retardant two-component matte films under various application conditions

“…Firstly, synergistic flame retardance not only significantly maintains flame retardancy but also expands the application of various flame retardant elements 10,11 and flame retardant mechanisms. 12,13 Secondly, according to requirements, the ideal-functionalized 2K-WPU has multi-functions such as matte appearance, 14,15 fluorescence, 16 specular reflection 7 and anti-corrosion properties. 17,18 Thirdly, compared to non-flame-retardant 2K-WPUs, the thermostability, mechanical performance and water-resistance of flame retardant 2K-WPUs are slightly inadequate due to the combination of flame retardants.…”