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. 2017 Oct 8;9(10):492.
doi: 10.3390/polym9100492.

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

Xuan Yin  1 , Xiaoyu Li  2 , Yunjun Luo  3
Affiliations

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

Xuan Yin et al. Polymers (Basel). .

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.

Keywords: TGA-FTIR; coatings; flame retardancy; fluorescence; two-component waterborne polyurethane.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Fourier transformed infrared spectroscopy (FTIR) and (b) UV-vis spectrum of NOWPUs.
Figure 2
Figure 2
(a) Emulsion particle size, viscosity; and, (b) zeta potential of NOWPUs.
Figure 3
Figure 3
(a) Photographs of NOWPUs by natural; and (b–h) UV light; and (i) fluorescence emission spectrum of NOWPUs: the left of (b–h) was radiated at 254 nm UV lamp, the right of (b–h) was radiated at 365 nm UV lamp (The samples for natural light were original emulsion, concentration of NOWPUs for UV lamp = 10−3 g/mL in water).
Figure 4
Figure 4
Fluorescence spectrum of (a) NOWPU-0.5 and (b) NOWPU-1.0 with various temperatures (concentration of NOWPUs = 10−3 g/mL in water, λex of NOWPU-0.5 = 331 nm, λex of NOWPU-1.0 = 332 nm).
Figure 5
Figure 5
Fluorescence spectrum of (a) NOWPU-0.5 and (b) NOWPU-1.0 with various solvents (Concentration of NOWPUs = 10−3 g/mL in water, λex of NOWPU-0.5 = 331 nm, λex of NOWPU-1.0 = 332 nm).
Figure 6
Figure 6
(a) DSC (differential scanning calorimetry) curves; (b) TGA (thermogravimetric analysis) curves and (c) DTG (differential thermal gravity) curves of NOWPU films.
Figure 7
Figure 7
TGA-FTIR and FTIR of carbon residue of NOWPU-1.0 film: (a) three-dimensional spectrum; (b) TGA-FTIR at various temperature; and, (c) FTIR of carbon residue at various temperature.
Scheme 1
Scheme 1
Thermal degradation mechanism mode of NOWPU-1.0 coatings.
Figure 8
Figure 8
SEM images of (a–c) NOWPU-0.5 and (d–f) NOWPU-1.0.
Figure 9
Figure 9
Coating films radiated by UV and natural lights: (a) NOWPU-0.5; (b) NOWPU-1.0.
See this image and copyright information in PMC

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